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// The structure of how to add new method types to the system.
// -----------------------------------------------------------
// All methods need 3 things:
// - A type definition
// - The type needs a getKind method
// - The type needs a handler method
// Overall structure example shown below.
//
// ---
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// type methodCommandCLICommandRequest struct {
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// commandOrEvent CommandOrEvent
// }
//
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// func (m methodCommandCLICommandRequest) getKind() CommandOrEvent {
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// return m.commandOrEvent
// }
//
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// func (m methodCommandCLICommandRequest) handler(s *server, message Message, node string) ([]byte, error) {
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// ...
// ...
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// ackMsg := []byte(fmt.Sprintf("confirmed from node: %v: messageID: %v\n---\n%s---", node, message.ID, out))
// return ackMsg, nil
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// }
//
// ---
// You also need to make a constant for the Method, and add
// that constant as the key in the map, where the value is
// the actual type you want to map it to with a handler method.
// You also specify if it is a Command or Event, and if it is
// ACK or NACK.
// Check out the existing code below for more examples.
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package steward
import (
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"bufio"
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"bytes"
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"context"
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"encoding/json"
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"fmt"
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"io"
"net/http"
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"os"
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"os/exec"
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"path"
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"path/filepath"
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"strconv"
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"strings"
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"sync"
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"time"
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"github.com/hpcloud/tail"
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"github.com/prometheus/client_golang/prometheus"
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)
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// Method is used to specify the actual function/method that
// is represented in a typed manner.
type Method string
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// ------------------------------------------------------------
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// The constants that will be used throughout the system for
// when specifying what kind of Method to send or work with.
const (
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// Initial parent method used to start other processes.
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REQInitial Method = "REQInitial"
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// Get a list of all the running processes.
REQOpProcessList Method = "REQOpProcessList"
// Start up a process.
REQOpProcessStart Method = "REQOpProcessStart"
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// Stop up a process.
REQOpProcessStop Method = "REQOpProcessStop"
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// Execute a CLI command in for example bash or cmd.
// This is an event type, where a message will be sent to a
// node with the command to execute and an ACK will be replied
// if it was delivered succesfully. The output of the command
// ran will be delivered back to the node where it was initiated
// as a new message.
// The data field is a slice of strings where the first string
// value should be the command, and the following the arguments.
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REQCliCommand Method = "REQCliCommand"
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// REQCliCommandCont same as normal Cli command, but can be used
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// when running a command that will take longer time and you want
// to send the output of the command continually back as it is
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// generated, and not wait until the command is finished.
REQCliCommandCont Method = "REQCliCommandCont"
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// Send text to be logged to the console.
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// The data field is a slice of strings where the first string
// value should be the command, and the following the arguments.
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REQToConsole Method = "REQToConsole"
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// REQTuiToConsole
REQTuiToConsole Method = "REQTuiToConsole"
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// Send text logging to some host by appending the output to a
// file, if the file do not exist we create it.
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// A file with the full subject+hostName will be created on
// the receiving end.
// The data field is a slice of strings where the values of the
// slice will be written to the log file.
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REQToFileAppend Method = "REQToFileAppend"
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// Send text to some host by overwriting the existing content of
// the fileoutput to a file. If the file do not exist we create it.
// A file with the full subject+hostName will be created on
// the receiving end.
// The data field is a slice of strings where the values of the
// slice will be written to the file.
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REQToFile Method = "REQToFile"
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// REQToFileNACK same as REQToFile but NACK.
REQToFileNACK Method = "REQToFileNACK"
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// Read the source file to be copied to some node.
REQCopyFileFrom Method = "REQCopyFileFrom"
// Write the destination copied to some node.
REQCopyFileTo Method = "REQCopyFileTo"
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// Send Hello I'm here message.
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REQHello Method = "REQHello"
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// Error log methods to centralError node.
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REQErrorLog Method = "REQErrorLog"
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// Echo request will ask the subscriber for a
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// reply generated as a new message, and sent back to where
// the initial request was made.
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REQPing Method = "REQPing"
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// Will generate a reply for a ECHORequest
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REQPong Method = "REQPong"
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// Http Get
REQHttpGet Method = "REQHttpGet"
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// Http Get Scheduled
// The second element of the MethodArgs slice holds the timer defined in seconds.
REQHttpGetScheduled Method = "REQHttpGetScheduled"
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// Tail file
REQTailFile Method = "REQTailFile"
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// Write to steward socket
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REQRelay Method = "REQRelay"
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// The method handler for the first step in a relay chain.
REQRelayInitial Method = "REQRelayInitial"
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// REQNone is used when there should be no reply.
REQNone Method = "REQNone"
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// REQPublicKey will get the public ed25519 key from a node.
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REQPublicKey Method = "REQPublicKey"
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// REQPublicKeysGet will get all the public keys from central.
REQPublicKeysGet Method = "REQPublicKeysGet"
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// REQPublicKeysToNode will put all the public received from central.
REQPublicKeysToNode Method = "REQPublicKeysToNode"
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// REQAuthPublicKeysAllow
REQPublicKeysAllow Method = "REQPublicKeysAllow"
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)
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// The mapping of all the method constants specified, what type
// it references, and the kind if it is an Event or Command, and
// if it is ACK or NACK.
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// Allowed values for the Event field are:
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// - EventACK
// - EventNack
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func ( m Method ) GetMethodsAvailable ( ) MethodsAvailable {
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ma := MethodsAvailable {
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Methodhandlers : map [ Method ] methodHandler {
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REQInitial : methodREQInitial {
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event : EventACK ,
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} ,
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REQOpProcessList : methodREQOpProcessList {
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event : EventACK ,
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} ,
REQOpProcessStart : methodREQOpProcessStart {
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event : EventACK ,
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} ,
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REQOpProcessStop : methodREQOpProcessStop {
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event : EventACK ,
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} ,
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REQCliCommand : methodREQCliCommand {
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event : EventACK ,
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} ,
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REQCliCommandCont : methodREQCliCommandCont {
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event : EventACK ,
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} ,
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REQToConsole : methodREQToConsole {
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event : EventACK ,
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} ,
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REQTuiToConsole : methodREQTuiToConsole {
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event : EventACK ,
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} ,
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REQToFileAppend : methodREQToFileAppend {
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event : EventACK ,
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} ,
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REQToFile : methodREQToFile {
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event : EventACK ,
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} ,
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REQToFileNACK : methodREQToFile {
event : EventNACK ,
} ,
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REQCopyFileFrom : methodREQCopyFileFrom {
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event : EventACK ,
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} ,
REQCopyFileTo : methodREQCopyFileTo {
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event : EventACK ,
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} ,
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REQHello : methodREQHello {
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event : EventNACK ,
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} ,
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REQErrorLog : methodREQErrorLog {
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event : EventACK ,
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} ,
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REQPing : methodREQPing {
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event : EventACK ,
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} ,
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REQPong : methodREQPong {
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event : EventACK ,
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} ,
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REQHttpGet : methodREQHttpGet {
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event : EventACK ,
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} ,
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REQHttpGetScheduled : methodREQHttpGetScheduled {
event : EventACK ,
} ,
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REQTailFile : methodREQTailFile {
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event : EventACK ,
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} ,
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REQRelay : methodREQRelay {
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event : EventACK ,
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} ,
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REQRelayInitial : methodREQRelayInitial {
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event : EventACK ,
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} ,
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REQPublicKey : methodREQPublicKey {
event : EventACK ,
} ,
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REQPublicKeysGet : methodREQPublicKeysGet {
event : EventNACK ,
} ,
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REQPublicKeysToNode : methodREQPublicKeysToNode {
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event : EventNACK ,
} ,
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REQPublicKeysAllow : methodREQPublicKeysAllow {
event : EventACK ,
} ,
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} ,
}
return ma
}
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// Reply methods. The slice generated here is primarily used within
// the Stew client for knowing what of the req types are generally
// used as reply methods.
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func ( m Method ) GetReplyMethods ( ) [ ] Method {
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rm := [ ] Method { REQToConsole , REQTuiToConsole , REQCliCommand , REQCliCommandCont , REQToFile , REQToFileAppend , REQNone }
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return rm
}
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// getHandler will check the methodsAvailable map, and return the
// method handler for the method given
// as input argument.
func ( m Method ) getHandler ( method Method ) methodHandler {
ma := m . GetMethodsAvailable ( )
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mh := ma . Methodhandlers [ method ]
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return mh
}
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// getContextForMethodTimeout, will return a context with cancel function
// with the timeout set to the method timeout in the message.
// If the value of timeout is set to -1, we don't want it to stop, so we
// return a context with a timeout set to 200 years.
func getContextForMethodTimeout ( ctx context . Context , message Message ) ( context . Context , context . CancelFunc ) {
// If methodTimeout == -1, which means we don't want a timeout, set the
// time out to 200 years.
if message . MethodTimeout == - 1 {
return context . WithTimeout ( ctx , time . Hour * time . Duration ( 8760 * 200 ) )
}
return context . WithTimeout ( ctx , time . Second * time . Duration ( message . MethodTimeout ) )
}
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// ----
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// Initial parent method used to start other processes.
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type methodREQInitial struct {
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event Event
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}
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func ( m methodREQInitial ) getKind ( ) Event {
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return m . event
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}
func ( m methodREQInitial ) handler ( proc process , message Message , node string ) ( [ ] byte , error ) {
// proc.procFuncCh <- message
ackMsg := [ ] byte ( "confirmed from: " + node + ": " + fmt . Sprint ( message . ID ) )
return ackMsg , nil
}
// ----
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// MethodsAvailable holds a map of all the different method types and the
// associated handler to that method type.
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type MethodsAvailable struct {
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Methodhandlers map [ Method ] methodHandler
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}
// Check if exists will check if the Method is defined. If true the bool
// value will be set to true, and the methodHandler function for that type
// will be returned.
func ( ma MethodsAvailable ) CheckIfExists ( m Method ) ( methodHandler , bool ) {
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mFunc , ok := ma . Methodhandlers [ m ]
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if ok {
return mFunc , true
} else {
return nil , false
}
}
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// newReplyMessage will create and send a reply message back to where
// the original provided message came from. The primary use of this
// function is to report back to a node who sent a message with the
// result of the request method of the original message.
//
// The method to use for the reply message when reporting back should
// be specified within a message in the replyMethod field. We will
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// pick up that value here, and use it as the method for the new
// request message. If no replyMethod is set we default to the
// REQToFileAppend method type.
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//
// There will also be a copy of the original message put in the
// previousMessage field. For the copy of the original message the data
// field will be set to nil before the whole message is put in the
// previousMessage field so we don't copy around the original data in
// the reply response when it is not needed anymore.
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func newReplyMessage ( proc process , message Message , outData [ ] byte ) {
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// If REQNone is specified, we don't want to send a reply message
// so we silently just return without sending anything.
if message . ReplyMethod == "REQNone" {
return
}
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// If no replyMethod is set we default to writing to writing to
// a log file.
if message . ReplyMethod == "" {
message . ReplyMethod = REQToFileAppend
}
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// Make a copy of the message as it is right now to use
// in the previous message field, but set the data field
// to nil so we don't copy around the original data when
// we don't need to for the reply message.
thisMsg := message
thisMsg . Data = nil
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// Create a new message for the reply, and put it on the
// ringbuffer to be published.
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// TODO: Check that we still got all the fields present that are needed here.
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newMsg := Message {
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ToNode : message . FromNode ,
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FromNode : message . ToNode ,
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Data : outData ,
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Method : message . ReplyMethod ,
MethodArgs : message . ReplyMethodArgs ,
MethodTimeout : message . ReplyMethodTimeout ,
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IsReply : true ,
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ACKTimeout : message . ReplyACKTimeout ,
Retries : message . ReplyRetries ,
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Directory : message . Directory ,
FileName : message . FileName ,
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// Put in a copy of the initial request message, so we can use it's properties if
// needed to for example create the file structure naming on the subscriber.
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PreviousMessage : & thisMsg ,
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}
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sam , err := newSubjectAndMessage ( newMsg )
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if err != nil {
// In theory the system should drop the message before it reaches here.
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er := fmt . Errorf ( "error: newSubjectAndMessage : %v, message: %v" , err , message )
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proc . errorKernel . errSend ( proc , message , er )
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}
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proc . toRingbufferCh <- [ ] subjectAndMessage { sam }
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}
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// selectFileNaming will figure out the correct naming of the file
// structure to use for the reply data.
// It will return the filename, and the tree structure for the folders
// to create.
func selectFileNaming ( message Message , proc process ) ( string , string ) {
var fileName string
var folderTree string
switch {
case message . PreviousMessage == nil :
// If this was a direct request there are no previous message to take
// information from, so we use the one that are in the current mesage.
fileName = message . FileName
folderTree = filepath . Join ( proc . configuration . SubscribersDataFolder , message . Directory , string ( message . ToNode ) )
case message . PreviousMessage . ToNode != "" :
fileName = message . PreviousMessage . FileName
folderTree = filepath . Join ( proc . configuration . SubscribersDataFolder , message . PreviousMessage . Directory , string ( message . PreviousMessage . ToNode ) )
case message . PreviousMessage . ToNode == "" :
fileName = message . PreviousMessage . FileName
folderTree = filepath . Join ( proc . configuration . SubscribersDataFolder , message . PreviousMessage . Directory , string ( message . FromNode ) )
}
return fileName , folderTree
}
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// ------------------------------------------------------------
// Subscriber method handlers
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// ------------------------------------------------------------
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// The methodHandler interface.
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type methodHandler interface {
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handler ( proc process , message Message , node string ) ( [ ] byte , error )
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getKind ( ) Event
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}
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// -----
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// --- OpProcessList
type methodREQOpProcessList struct {
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event Event
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}
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func ( m methodREQOpProcessList ) getKind ( ) Event {
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return m . event
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}
// Handle Op Process List
func ( m methodREQOpProcessList ) handler ( proc process , message Message , node string ) ( [ ] byte , error ) {
proc . processes . wg . Add ( 1 )
go func ( ) {
defer proc . processes . wg . Done ( )
out := [ ] byte { }
// Loop the the processes map, and find all that is active to
// be returned in the reply message.
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proc . processes . active . mu . Lock ( )
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for _ , pTmp := range proc . processes . active . procNames {
s := fmt . Sprintf ( "%v, process: %v, id: %v, name: %v\n" , time . Now ( ) . Format ( "Mon Jan _2 15:04:05 2006" ) , pTmp . processKind , pTmp . processID , pTmp . subject . name ( ) )
sb := [ ] byte ( s )
out = append ( out , sb ... )
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}
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proc . processes . active . mu . Unlock ( )
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newReplyMessage ( proc , message , out )
} ( )
ackMsg := [ ] byte ( "confirmed from: " + node + ": " + fmt . Sprint ( message . ID ) )
return ackMsg , nil
}
// --- OpProcessStart
type methodREQOpProcessStart struct {
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event Event
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}
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func ( m methodREQOpProcessStart ) getKind ( ) Event {
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return m . event
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}
// Handle Op Process Start
func ( m methodREQOpProcessStart ) handler ( proc process , message Message , node string ) ( [ ] byte , error ) {
proc . processes . wg . Add ( 1 )
go func ( ) {
defer proc . processes . wg . Done ( )
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var out [ ] byte
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// We need to create a tempory method type to look up the kind for the
// real method for the message.
var mt Method
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switch {
case len ( message . MethodArgs ) < 1 :
er := fmt . Errorf ( "error: methodREQOpProcessStart: got <1 number methodArgs" )
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proc . errorKernel . errSend ( proc , message , er )
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return
}
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m := message . MethodArgs [ 0 ]
method := Method ( m )
tmpH := mt . getHandler ( Method ( method ) )
if tmpH == nil {
er := fmt . Errorf ( "error: OpProcessStart: no such request type defined: %v" + m )
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proc . errorKernel . errSend ( proc , message , er )
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return
}
// Create the process and start it.
sub := newSubject ( method , proc . configuration . NodeName )
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procNew := newProcess ( proc . ctx , proc . server , sub , processKindSubscriber , nil )
go procNew . spawnWorker ( )
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txt := fmt . Sprintf ( "info: OpProcessStart: started id: %v, subject: %v: node: %v" , procNew . processID , sub , message . ToNode )
er := fmt . Errorf ( txt )
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proc . errorKernel . errSend ( proc , message , er )
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out = [ ] byte ( txt + "\n" )
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newReplyMessage ( proc , message , out )
} ( )
ackMsg := [ ] byte ( "confirmed from: " + node + ": " + fmt . Sprint ( message . ID ) )
return ackMsg , nil
}
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// --- OpProcessStop
type methodREQOpProcessStop struct {
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event Event
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}
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func ( m methodREQOpProcessStop ) getKind ( ) Event {
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return m . event
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}
// RecevingNode Node `json:"receivingNode"`
// Method Method `json:"method"`
// Kind processKind `json:"kind"`
// ID int `json:"id"`
// Handle Op Process Start
func ( m methodREQOpProcessStop ) handler ( proc process , message Message , node string ) ( [ ] byte , error ) {
proc . processes . wg . Add ( 1 )
go func ( ) {
defer proc . processes . wg . Done ( )
var out [ ] byte
// We need to create a tempory method type to use to look up the kind for the
// real method for the message.
var mt Method
// --- Parse and check the method arguments given.
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// The Reason for also having the node as one of the arguments is
// that publisher processes are named by the node they are sending the
// message to. Subscriber processes names are named by the node name
// they are running on.
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if v := len ( message . MethodArgs ) ; v != 3 {
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er := fmt . Errorf ( "error: methodREQOpProcessStop: got <4 number methodArgs, want: method,node,kind" )
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proc . errorKernel . errSend ( proc , message , er )
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}
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methodString := message . MethodArgs [ 0 ]
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node := message . MethodArgs [ 1 ]
kind := message . MethodArgs [ 2 ]
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method := Method ( methodString )
tmpH := mt . getHandler ( Method ( method ) )
if tmpH == nil {
er := fmt . Errorf ( "error: OpProcessStop: no such request type defined: %v, check that the methodArgs are correct: " + methodString )
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proc . errorKernel . errSend ( proc , message , er )
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return
}
// --- Find, and stop process if found
// Based on the arg values received in the message we create a
// processName structure as used in naming the real processes.
// We can then use this processName to get the real values for the
// actual process we want to stop.
sub := newSubject ( method , string ( node ) )
processName := processNameGet ( sub . name ( ) , processKind ( kind ) )
// Remove the process from the processes active map if found.
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proc . processes . active . mu . Lock ( )
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toStopProc , ok := proc . processes . active . procNames [ processName ]
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if ok {
// Delete the process from the processes map
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delete ( proc . processes . active . procNames , processName )
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// Stop started go routines that belong to the process.
toStopProc . ctxCancel ( )
// Stop subscribing for messages on the process's subject.
err := toStopProc . natsSubscription . Unsubscribe ( )
if err != nil {
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er := fmt . Errorf ( "error: methodREQOpStopProcess failed to stop nats.Subscription: %v, methodArgs: %v" , err , message . MethodArgs )
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proc . errorKernel . errSend ( proc , message , er )
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}
// Remove the prometheus label
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proc . metrics . promProcessesAllRunning . Delete ( prometheus . Labels { "processName" : string ( processName ) } )
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txt := fmt . Sprintf ( "info: OpProcessStop: process stopped id: %v, method: %v on: %v" , toStopProc . processID , sub , message . ToNode )
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er := fmt . Errorf ( txt )
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proc . errorKernel . errSend ( proc , message , er )
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out = [ ] byte ( txt + "\n" )
newReplyMessage ( proc , message , out )
} else {
txt := fmt . Sprintf ( "error: OpProcessStop: did not find process to stop: %v on %v" , sub , message . ToNode )
er := fmt . Errorf ( txt )
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proc . errorKernel . errSend ( proc , message , er )
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out = [ ] byte ( txt + "\n" )
newReplyMessage ( proc , message , out )
}
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proc . processes . active . mu . Unlock ( )
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} ( )
ackMsg := [ ] byte ( "confirmed from: " + node + ": " + fmt . Sprint ( message . ID ) )
return ackMsg , nil
}
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// ----
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type methodREQToFileAppend struct {
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event Event
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}
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func ( m methodREQToFileAppend ) getKind ( ) Event {
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return m . event
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}
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// Handle appending data to file.
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func ( m methodREQToFileAppend ) handler ( proc process , message Message , node string ) ( [ ] byte , error ) {
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// If it was a request type message we want to check what the initial messages
// method, so we can use that in creating the file name to store the data.
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fileName , folderTree := selectFileNaming ( message , proc )
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// Check if folder structure exist, if not create it.
if _ , err := os . Stat ( folderTree ) ; os . IsNotExist ( err ) {
err := os . MkdirAll ( folderTree , 0700 )
if err != nil {
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er := fmt . Errorf ( "error: methodREQToFileAppend: failed to create toFileAppend directory tree:%v, subject: %v, %v" , folderTree , proc . subject , err )
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proc . errorKernel . errSend ( proc , message , er )
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}
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er := fmt . Errorf ( "info: Creating subscribers data folder at %v" , folderTree )
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proc . errorKernel . logConsoleOnlyIfDebug ( er , proc . configuration )
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}
// Open file and write data.
file := filepath . Join ( folderTree , fileName )
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f , err := os . OpenFile ( file , os . O_APPEND | os . O_RDWR | os . O_CREATE | os . O_SYNC , 0600 )
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if err != nil {
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er := fmt . Errorf ( "error: methodREQToFileAppend.handler: failed to open file: %v, %v" , file , err )
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proc . errorKernel . errSend ( proc , message , er )
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return nil , err
}
defer f . Close ( )
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_ , err = f . Write ( message . Data )
f . Sync ( )
if err != nil {
er := fmt . Errorf ( "error: methodEventTextLogging.handler: failed to write to file : %v, %v" , file , err )
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proc . errorKernel . errSend ( proc , message , er )
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}
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ackMsg := [ ] byte ( "confirmed from: " + node + ": " + fmt . Sprint ( message . ID ) )
return ackMsg , nil
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}
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// -----
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type methodREQToFile struct {
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event Event
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}
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func ( m methodREQToFile ) getKind ( ) Event {
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return m . event
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}
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// Handle writing to a file. Will truncate any existing data if the file did already
// exist.
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func ( m methodREQToFile ) handler ( proc process , message Message , node string ) ( [ ] byte , error ) {
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// If it was a request type message we want to check what the initial messages
// method, so we can use that in creating the file name to store the data.
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fileName , folderTree := selectFileNaming ( message , proc )
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// Check if folder structure exist, if not create it.
if _ , err := os . Stat ( folderTree ) ; os . IsNotExist ( err ) {
err := os . MkdirAll ( folderTree , 0700 )
if err != nil {
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er := fmt . Errorf ( "error: methodREQToFile failed to create toFile directory tree: subject:%v, folderTree: %v, %v" , proc . subject , folderTree , err )
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proc . errorKernel . errSend ( proc , message , er )
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return nil , er
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}
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er := fmt . Errorf ( "info: Creating subscribers data folder at %v" , folderTree )
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proc . errorKernel . logConsoleOnlyIfDebug ( er , proc . configuration )
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}
// Open file and write data.
file := filepath . Join ( folderTree , fileName )
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f , err := os . OpenFile ( file , os . O_CREATE | os . O_RDWR | os . O_TRUNC , 0755 )
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if err != nil {
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er := fmt . Errorf ( "error: methodREQToFile.handler: failed to open file, check that you've specified a value for fileName in the message: directory: %v, fileName: %v, %v" , message . Directory , message . FileName , err )
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proc . errorKernel . errSend ( proc , message , er )
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return nil , err
}
defer f . Close ( )
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_ , err = f . Write ( message . Data )
f . Sync ( )
if err != nil {
er := fmt . Errorf ( "error: methodEventTextLogging.handler: failed to write to file: file: %v, %v" , file , err )
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proc . errorKernel . errSend ( proc , message , er )
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}
ackMsg := [ ] byte ( "confirmed from: " + node + ": " + fmt . Sprint ( message . ID ) )
return ackMsg , nil
}
// ----
type methodREQCopyFileFrom struct {
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event Event
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}
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func ( m methodREQCopyFileFrom ) getKind ( ) Event {
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return m . event
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}
// Handle writing to a file. Will truncate any existing data if the file did already
// exist.
func ( m methodREQCopyFileFrom ) handler ( proc process , message Message , node string ) ( [ ] byte , error ) {
proc . processes . wg . Add ( 1 )
go func ( ) {
defer proc . processes . wg . Done ( )
switch {
case len ( message . MethodArgs ) < 3 :
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er := fmt . Errorf ( "error: methodREQCopyFileFrom: got <3 number methodArgs: want srcfilePath,dstNode,dstFilePath" )
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proc . errorKernel . errSend ( proc , message , er )
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return
}
SrcFilePath := message . MethodArgs [ 0 ]
DstNode := message . MethodArgs [ 1 ]
DstFilePath := message . MethodArgs [ 2 ]
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// Get a context with the timeout specified in message.MethodTimeout.
ctx , cancel := getContextForMethodTimeout ( proc . ctx , message )
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defer cancel ( )
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outCh := make ( chan [ ] byte )
errCh := make ( chan error )
// Read the file, and put the result on the out channel to be sent when done reading.
proc . processes . wg . Add ( 1 )
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go copyFileFrom ( ctx , & proc . processes . wg , SrcFilePath , errCh , outCh )
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// Wait here until we got the data to send, then create a new message
// and send it.
// Also checking the ctx.Done which calls Cancel will allow us to
// kill all started go routines started by this message.
select {
case <- ctx . Done ( ) :
er := fmt . Errorf ( "error: methodREQCopyFile: got <-ctx.Done(): %v" , message . MethodArgs )
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proc . errorKernel . errSend ( proc , message , er )
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return
case er := <- errCh :
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proc . errorKernel . errSend ( proc , message , er )
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return
case out := <- outCh :
dstDir := filepath . Dir ( DstFilePath )
dstFile := filepath . Base ( DstFilePath )
// Prepare for sending a new message with the output
// Copy the original message to get the defaults for timeouts etc,
// and set new values for fields to change.
msg := message
msg . ToNode = Node ( DstNode )
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//msg.Method = REQToFile
msg . Method = REQCopyFileTo
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msg . Data = out
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msg . Directory = dstDir
msg . FileName = dstFile
// Create SAM and put the message on the send new message channel.
sam , err := newSubjectAndMessage ( msg )
if err != nil {
er := fmt . Errorf ( "error: newSubjectAndMessage : %v, message: %v" , err , message )
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proc . errorKernel . errSend ( proc , message , er )
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}
proc . toRingbufferCh <- [ ] subjectAndMessage { sam }
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replyData := fmt . Sprintf ( "info: succesfully read the file %v, and sent the content to %v\n" , SrcFilePath , DstNode )
newReplyMessage ( proc , message , [ ] byte ( replyData ) )
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}
} ( )
ackMsg := [ ] byte ( "confirmed from: " + node + ": " + fmt . Sprint ( message . ID ) )
return ackMsg , nil
}
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// copyFileFrom will read a file to be copied from the specified SrcFilePath.
// The result of be delivered on the provided outCh.
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func copyFileFrom ( ctx context . Context , wg * sync . WaitGroup , SrcFilePath string , errCh chan error , outCh chan [ ] byte ) {
defer wg . Done ( )
const natsMaxMsgSize = 1000000
fi , err := os . Stat ( SrcFilePath )
// Check if the src file exists, and that it is not bigger than
// the default limit used by nats which is 1MB.
switch {
case os . IsNotExist ( err ) :
errCh <- fmt . Errorf ( "error: methodREQCopyFile: src file not found: %v" , SrcFilePath )
return
case fi . Size ( ) > natsMaxMsgSize :
errCh <- fmt . Errorf ( "error: methodREQCopyFile: src file to big. max size: %v" , natsMaxMsgSize )
return
}
fh , err := os . Open ( SrcFilePath )
if err != nil {
errCh <- fmt . Errorf ( "error: methodREQCopyFile: failed to open file: %v, %v" , SrcFilePath , err )
return
}
b , err := io . ReadAll ( fh )
if err != nil {
errCh <- fmt . Errorf ( "error: methodREQCopyFile: failed to read file: %v, %v" , SrcFilePath , err )
return
}
select {
case outCh <- b :
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// fmt.Printf(" * DEBUG: after io.ReadAll: outCh <- b\n")
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case <- ctx . Done ( ) :
return
}
}
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// ----
type methodREQCopyFileTo struct {
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event Event
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}
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func ( m methodREQCopyFileTo ) getKind ( ) Event {
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return m . event
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}
// Handle writing to a file. Will truncate any existing data if the file did already
// exist.
// Same as the REQToFile, but this requst type don't use the default data folder path
// for where to store files or add information about node names.
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// This method also sends a msgReply back to the publisher if the method was done
// successfully, where REQToFile do not.
// This method will truncate and overwrite any existing files.
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func ( m methodREQCopyFileTo ) handler ( proc process , message Message , node string ) ( [ ] byte , error ) {
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proc . processes . wg . Add ( 1 )
go func ( ) {
defer proc . processes . wg . Done ( )
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// Get a context with the timeout specified in message.MethodTimeout.
ctx , cancel := getContextForMethodTimeout ( proc . ctx , message )
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defer cancel ( )
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// Put data that should be the result of the action done in the inner
// go routine on the outCh.
outCh := make ( chan [ ] byte )
// Put errors from the inner go routine on the errCh.
errCh := make ( chan error )
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proc . processes . wg . Add ( 1 )
go func ( ) {
defer proc . processes . wg . Done ( )
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// ---
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switch {
case len ( message . MethodArgs ) < 3 :
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er := fmt . Errorf ( "error: methodREQCopyFileTo: got <3 number methodArgs: want srcfilePath,dstNode,dstFilePath" )
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proc . errorKernel . errSend ( proc , message , er )
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return
}
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// Pick up the values for the directory and filename for where
// to store the file.
DstFilePath := message . MethodArgs [ 2 ]
dstDir := filepath . Dir ( DstFilePath )
dstFile := filepath . Base ( DstFilePath )
fileRealPath := path . Join ( dstDir , dstFile )
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// Check if folder structure exist, if not create it.
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if _ , err := os . Stat ( dstDir ) ; os . IsNotExist ( err ) {
err := os . MkdirAll ( dstDir , 0700 )
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if err != nil {
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er := fmt . Errorf ( "failed to create toFile directory tree: subject:%v, folderTree: %v, %v" , proc . subject , dstDir , err )
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errCh <- er
return
}
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{
er := fmt . Errorf ( "info: MethodREQCopyFileTo: Creating folders %v" , dstDir )
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proc . errorKernel . logConsoleOnlyIfDebug ( er , proc . configuration )
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}
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}
// Open file and write data. Truncate and overwrite any existing files.
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file := filepath . Join ( dstDir , dstFile )
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f , err := os . OpenFile ( file , os . O_CREATE | os . O_RDWR | os . O_TRUNC , 0755 )
if err != nil {
er := fmt . Errorf ( "failed to open file, check that you've specified a value for fileName in the message: directory: %v, fileName: %v, %v" , message . Directory , message . FileName , err )
errCh <- er
return
}
defer f . Close ( )
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_ , err = f . Write ( message . Data )
f . Sync ( )
if err != nil {
er := fmt . Errorf ( "failed to write to file: file: %v, error: %v" , file , err )
errCh <- er
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}
// All went ok, send a signal to the outer select statement.
outCh <- [ ] byte ( fileRealPath )
// ---
} ( )
// Wait for messages received from the inner go routine.
select {
case <- ctx . Done ( ) :
er := fmt . Errorf ( "error: methodREQCopyFileTo: got <-ctx.Done(): %v" , message . MethodArgs )
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proc . errorKernel . errSend ( proc , message , er )
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return
case err := <- errCh :
er := fmt . Errorf ( "error: methodREQCopyFileTo: %v" , err )
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proc . errorKernel . errSend ( proc , message , er )
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return
case out := <- outCh :
replyData := fmt . Sprintf ( "info: succesfully created and wrote the file %v\n" , out )
newReplyMessage ( proc , message , [ ] byte ( replyData ) )
return
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}
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} ( )
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ackMsg := [ ] byte ( "confirmed from: " + node + ": " + fmt . Sprint ( message . ID ) )
return ackMsg , nil
}
// ----
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type methodREQHello struct {
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event Event
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}
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func ( m methodREQHello ) getKind ( ) Event {
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return m . event
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}
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// Handler for receiving hello messages.
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func ( m methodREQHello ) handler ( proc process , message Message , node string ) ( [ ] byte , error ) {
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data := fmt . Sprintf ( "%v, Received hello from %#v\n" , time . Now ( ) . Format ( "Mon Jan _2 15:04:05 2006" ) , message . FromNode )
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fileName := message . FileName
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folderTree := filepath . Join ( proc . configuration . SubscribersDataFolder , message . Directory , string ( message . FromNode ) )
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// Check if folder structure exist, if not create it.
if _ , err := os . Stat ( folderTree ) ; os . IsNotExist ( err ) {
err := os . MkdirAll ( folderTree , 0700 )
if err != nil {
return nil , fmt . Errorf ( "error: failed to create errorLog directory tree %v: %v" , folderTree , err )
}
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er := fmt . Errorf ( "info: Creating subscribers data folder at %v" , folderTree )
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proc . errorKernel . logConsoleOnlyIfDebug ( er , proc . configuration )
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}
// Open file and write data.
file := filepath . Join ( folderTree , fileName )
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//f, err := os.OpenFile(file, os.O_APPEND|os.O_RDWR|os.O_CREATE|os.O_SYNC, 0600)
f , err := os . OpenFile ( file , os . O_TRUNC | os . O_RDWR | os . O_CREATE | os . O_SYNC , 0600 )
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if err != nil {
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er := fmt . Errorf ( "error: methodREQHello.handler: failed to open file: %v" , err )
return nil , er
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}
defer f . Close ( )
_ , err = f . Write ( [ ] byte ( data ) )
f . Sync ( )
if err != nil {
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er := fmt . Errorf ( "error: methodEventTextLogging.handler: failed to write to file: %v" , err )
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proc . errorKernel . errSend ( proc , message , er )
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}
// --------------------------
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// send the message to the procFuncCh which is running alongside the process
// and can hold registries and handle special things for an individual process.
proc . procFuncCh <- message
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ackMsg := [ ] byte ( "confirmed from: " + node + ": " + fmt . Sprint ( message . ID ) )
return ackMsg , nil
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}
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// ---
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type methodREQErrorLog struct {
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event Event
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}
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func ( m methodREQErrorLog ) getKind ( ) Event {
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return m . event
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}
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// Handle the writing of error logs.
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func ( m methodREQErrorLog ) handler ( proc process , message Message , node string ) ( [ ] byte , error ) {
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proc . metrics . promErrorMessagesReceivedTotal . Inc ( )
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// If it was a request type message we want to check what the initial messages
// method, so we can use that in creating the file name to store the data.
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fileName , folderTree := selectFileNaming ( message , proc )
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// Check if folder structure exist, if not create it.
if _ , err := os . Stat ( folderTree ) ; os . IsNotExist ( err ) {
err := os . MkdirAll ( folderTree , 0700 )
if err != nil {
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return nil , fmt . Errorf ( "error: failed to create errorLog directory tree %v: %v" , folderTree , err )
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}
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er := fmt . Errorf ( "info: Creating subscribers data folder at %v" , folderTree )
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proc . errorKernel . logConsoleOnlyIfDebug ( er , proc . configuration )
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}
// Open file and write data.
file := filepath . Join ( folderTree , fileName )
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f , err := os . OpenFile ( file , os . O_APPEND | os . O_RDWR | os . O_CREATE | os . O_SYNC , 0600 )
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if err != nil {
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er := fmt . Errorf ( "error: methodREQErrorLog.handler: failed to open file: %v" , err )
return nil , er
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}
defer f . Close ( )
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_ , err = f . Write ( message . Data )
f . Sync ( )
if err != nil {
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er := fmt . Errorf ( "error: methodEventTextLogging.handler: failed to write to file: %v" , err )
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proc . errorKernel . errSend ( proc , message , er )
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}
ackMsg := [ ] byte ( "confirmed from: " + node + ": " + fmt . Sprint ( message . ID ) )
return ackMsg , nil
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}
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// ---
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type methodREQPing struct {
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event Event
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}
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func ( m methodREQPing ) getKind ( ) Event {
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return m . event
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}
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// Handle receving a ping.
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func ( m methodREQPing ) handler ( proc process , message Message , node string ) ( [ ] byte , error ) {
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// Write to file that we received a ping
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2021-08-26 06:40:33 +00:00
// If it was a request type message we want to check what the initial messages
// method, so we can use that in creating the file name to store the data.
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fileName , folderTree := selectFileNaming ( message , proc )
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// Check if folder structure exist, if not create it.
if _ , err := os . Stat ( folderTree ) ; os . IsNotExist ( err ) {
err := os . MkdirAll ( folderTree , 0700 )
if err != nil {
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er := fmt . Errorf ( "error: methodREQPing.handler: failed to create toFile directory tree: %v, %v" , folderTree , err )
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proc . errorKernel . errSend ( proc , message , er )
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return nil , er
}
2022-02-18 08:51:11 +00:00
er := fmt . Errorf ( "info: Creating subscribers data folder at %v" , folderTree )
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proc . errorKernel . logConsoleOnlyIfDebug ( er , proc . configuration )
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}
// Open file.
file := filepath . Join ( folderTree , fileName )
f , err := os . OpenFile ( file , os . O_CREATE | os . O_RDWR | os . O_TRUNC , 0755 )
if err != nil {
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er := fmt . Errorf ( "error: methodREQPing.handler: failed to open file, check that you've specified a value for fileName in the message: directory: %v, fileName: %v, %v" , message . Directory , message . FileName , err )
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proc . errorKernel . errSend ( proc , message , er )
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2021-08-26 06:40:33 +00:00
return nil , err
}
defer f . Close ( )
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2021-08-26 06:40:33 +00:00
// And write the data
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d := fmt . Sprintf ( "%v, ping received from %v\n" , time . Now ( ) . Format ( "Mon Jan _2 15:04:05 2006" ) , message . FromNode )
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_ , err = f . Write ( [ ] byte ( d ) )
f . Sync ( )
if err != nil {
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er := fmt . Errorf ( "error: methodREQPing.handler: failed to write to file: directory: %v, fileName: %v, %v" , message . Directory , message . FileName , err )
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proc . errorKernel . errSend ( proc , message , er )
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}
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2021-08-12 10:27:47 +00:00
proc . processes . wg . Add ( 1 )
2021-04-06 05:31:50 +00:00
go func ( ) {
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defer proc . processes . wg . Done ( )
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2021-08-26 06:40:33 +00:00
newReplyMessage ( proc , message , nil )
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} ( )
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ackMsg := [ ] byte ( "confirmed from: " + node + ": " + fmt . Sprint ( message . ID ) )
return ackMsg , nil
}
// ---
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type methodREQPong struct {
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event Event
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}
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func ( m methodREQPong ) getKind ( ) Event {
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return m . event
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}
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// Handle receiving a pong.
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func ( m methodREQPong ) handler ( proc process , message Message , node string ) ( [ ] byte , error ) {
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// Write to file that we received a pong
// If it was a request type message we want to check what the initial messages
// method, so we can use that in creating the file name to store the data.
2021-09-07 04:24:21 +00:00
fileName , folderTree := selectFileNaming ( message , proc )
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// Check if folder structure exist, if not create it.
if _ , err := os . Stat ( folderTree ) ; os . IsNotExist ( err ) {
err := os . MkdirAll ( folderTree , 0700 )
if err != nil {
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er := fmt . Errorf ( "error: methodREQPong.handler: failed to create toFile directory tree %v: %v" , folderTree , err )
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proc . errorKernel . errSend ( proc , message , er )
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return nil , er
}
2022-02-18 08:51:11 +00:00
er := fmt . Errorf ( "info: Creating subscribers data folder at %v" , folderTree )
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proc . errorKernel . logConsoleOnlyIfDebug ( er , proc . configuration )
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}
// Open file.
file := filepath . Join ( folderTree , fileName )
f , err := os . OpenFile ( file , os . O_CREATE | os . O_RDWR | os . O_TRUNC , 0755 )
if err != nil {
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er := fmt . Errorf ( "error: methodREQPong.handler: failed to open file, check that you've specified a value for fileName in the message: directory: %v, fileName: %v, %v" , message . Directory , message . FileName , err )
2022-04-01 06:43:14 +00:00
proc . errorKernel . errSend ( proc , message , er )
2022-02-18 08:51:11 +00:00
2021-08-26 06:40:33 +00:00
return nil , err
}
defer f . Close ( )
// And write the data
2021-08-27 10:27:38 +00:00
d := fmt . Sprintf ( "%v, pong received from %v\n" , time . Now ( ) . Format ( "Mon Jan _2 15:04:05 2006" ) , message . PreviousMessage . ToNode )
2021-08-26 06:40:33 +00:00
_ , err = f . Write ( [ ] byte ( d ) )
f . Sync ( )
if err != nil {
2021-09-23 06:19:53 +00:00
er := fmt . Errorf ( "error: methodREQPong.handler: failed to write to file: directory: %v, fileName: %v, %v" , message . Directory , message . FileName , err )
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proc . errorKernel . errSend ( proc , message , er )
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}
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ackMsg := [ ] byte ( "confirmed from: " + node + ": " + fmt . Sprint ( message . ID ) )
return ackMsg , nil
}
2021-03-11 11:07:09 +00:00
2021-03-11 11:51:16 +00:00
// ---
2021-03-11 11:07:09 +00:00
2021-04-04 09:19:17 +00:00
type methodREQCliCommand struct {
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event Event
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}
2022-01-27 06:19:04 +00:00
func ( m methodREQCliCommand ) getKind ( ) Event {
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return m . event
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}
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// handler to run a CLI command with timeout context. The handler will
// return the output of the command run back to the calling publisher
// as a new message.
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func ( m methodREQCliCommand ) handler ( proc process , message Message , node string ) ( [ ] byte , error ) {
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inf := fmt . Errorf ( "<--- CLICommandREQUEST received from: %v, containing: %v" , message . FromNode , message . MethodArgs )
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proc . errorKernel . logConsoleOnlyIfDebug ( inf , proc . configuration )
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2021-03-29 04:53:34 +00:00
// Execute the CLI command in it's own go routine, so we are able
// to return immediately with an ack reply that the messag was
// received, and we create a new message to send back to the calling
// node for the out put of the actual command.
2021-08-12 10:27:47 +00:00
proc . processes . wg . Add ( 1 )
2021-03-26 15:04:01 +00:00
go func ( ) {
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defer proc . processes . wg . Done ( )
2021-09-23 10:52:59 +00:00
var a [ ] string
switch {
case len ( message . MethodArgs ) < 1 :
er := fmt . Errorf ( "error: methodREQCliCommand: got <1 number methodArgs" )
2022-04-01 06:43:14 +00:00
proc . errorKernel . errSend ( proc , message , er )
2022-02-18 08:51:11 +00:00
2021-09-23 10:52:59 +00:00
return
case len ( message . MethodArgs ) >= 0 :
a = message . MethodArgs [ 1 : ]
}
2021-09-16 09:51:34 +00:00
c := message . MethodArgs [ 0 ]
2021-03-11 11:07:09 +00:00
2022-01-26 14:35:31 +00:00
// Get a context with the timeout specified in message.MethodTimeout.
ctx , cancel := getContextForMethodTimeout ( proc . ctx , message )
2021-03-26 15:04:01 +00:00
outCh := make ( chan [ ] byte )
2021-08-12 10:27:47 +00:00
proc . processes . wg . Add ( 1 )
2021-03-26 15:04:01 +00:00
go func ( ) {
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defer proc . processes . wg . Done ( )
2021-09-22 14:58:23 +00:00
// Check if {{data}} is defined in the method arguments. If found put the
// data payload there.
var foundEnvData bool
var envData string
for i , v := range message . MethodArgs {
if strings . Contains ( v , "{{STEWARD_DATA}}" ) {
foundEnvData = true
// Replace the found env variable placeholder with an actual env variable
message . MethodArgs [ i ] = strings . Replace ( message . MethodArgs [ i ] , "{{STEWARD_DATA}}" , "$STEWARD_DATA" , - 1 )
// Put all the data which is a slice of string into a single
// string so we can put it in a single env variable.
2022-01-31 07:49:46 +00:00
envData = string ( message . Data )
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}
}
2021-03-26 15:04:01 +00:00
cmd := exec . CommandContext ( ctx , c , a ... )
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2021-09-22 13:25:40 +00:00
// Check for the use of env variable for STEWARD_DATA, and set env if found.
if foundEnvData {
envData = fmt . Sprintf ( "STEWARD_DATA=%v" , envData )
cmd . Env = append ( cmd . Env , envData )
}
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var out bytes . Buffer
var stderr bytes . Buffer
cmd . Stdout = & out
cmd . Stderr = & stderr
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2021-09-08 03:50:45 +00:00
err := cmd . Run ( )
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if err != nil {
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er := fmt . Errorf ( "error: methodREQCliCommand: cmd.Run failed : %v, methodArgs: %v, error_output: %v" , err , message . MethodArgs , stderr . String ( ) )
2022-04-01 06:43:14 +00:00
proc . errorKernel . errSend ( proc , message , er )
2021-03-26 15:04:01 +00:00
}
2022-01-26 14:35:31 +00:00
2021-08-12 10:27:47 +00:00
select {
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case outCh <- out . Bytes ( ) :
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case <- ctx . Done ( ) :
return
}
2021-03-26 15:04:01 +00:00
} ( )
select {
case <- ctx . Done ( ) :
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cancel ( )
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er := fmt . Errorf ( "error: methodREQCliCommand: method timed out: %v" , message . MethodArgs )
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proc . errorKernel . errSend ( proc , message , er )
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case out := <- outCh :
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cancel ( )
2021-03-26 15:04:01 +00:00
2021-09-22 14:58:23 +00:00
// NB: Not quite sure what is the best way to handle the below
// isReply right now. Implementing as send to central for now.
//
2021-09-22 14:08:55 +00:00
// If this is this a reply message swap the toNode and fromNode
// fields so the output of the command are sent to central node.
if message . IsReply {
message . ToNode , message . FromNode = message . FromNode , message . ToNode
}
2021-03-31 11:29:55 +00:00
// Prepare and queue for sending a new message with the output
// of the action executed.
2021-04-13 13:28:54 +00:00
newReplyMessage ( proc , message , out )
2021-03-26 15:04:01 +00:00
}
2021-03-12 11:08:11 +00:00
2021-03-26 15:04:01 +00:00
} ( )
2021-03-11 11:07:09 +00:00
ackMsg := [ ] byte ( "confirmed from: " + node + ": " + fmt . Sprint ( message . ID ) )
return ackMsg , nil
}
// ---
2021-04-13 15:22:25 +00:00
type methodREQToConsole struct {
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event Event
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}
2022-01-27 06:19:04 +00:00
func ( m methodREQToConsole ) getKind ( ) Event {
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return m . event
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}
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// Handler to write directly to console.
2022-01-17 14:13:14 +00:00
// This handler handles the writing to console both for TUI and shell clients.
2021-04-13 15:22:25 +00:00
func ( m methodREQToConsole ) handler ( proc process , message Message , node string ) ( [ ] byte , error ) {
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2022-01-17 14:13:14 +00:00
switch {
case proc . configuration . EnableTUI :
if proc . processes . tui . toConsoleCh != nil {
proc . processes . tui . toConsoleCh <- message . Data
} else {
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er := fmt . Errorf ( "error: no tui client started" )
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proc . errorKernel . errSend ( proc , message , er )
2022-01-17 14:13:14 +00:00
}
default :
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fmt . Fprintf ( os . Stdout , "%v" , string ( message . Data ) )
2022-01-17 14:13:14 +00:00
fmt . Println ( )
}
2021-11-11 12:43:32 +00:00
2021-03-11 11:07:09 +00:00
ackMsg := [ ] byte ( "confirmed from: " + node + ": " + fmt . Sprint ( message . ID ) )
return ackMsg , nil
}
2021-04-06 17:42:03 +00:00
// ---
2022-01-12 06:42:41 +00:00
type methodREQTuiToConsole struct {
2022-01-27 09:06:06 +00:00
event Event
2022-01-12 06:42:41 +00:00
}
2022-01-27 06:19:04 +00:00
func ( m methodREQTuiToConsole ) getKind ( ) Event {
2022-01-27 09:06:06 +00:00
return m . event
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}
// Handler to write directly to console.
2022-01-17 14:13:14 +00:00
// DEPRECATED
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func ( m methodREQTuiToConsole ) handler ( proc process , message Message , node string ) ( [ ] byte , error ) {
if proc . processes . tui . toConsoleCh != nil {
proc . processes . tui . toConsoleCh <- message . Data
} else {
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er := fmt . Errorf ( "error: no tui client started" )
2022-04-01 06:43:14 +00:00
proc . errorKernel . errSend ( proc , message , er )
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}
ackMsg := [ ] byte ( "confirmed from: " + node + ": " + fmt . Sprint ( message . ID ) )
return ackMsg , nil
}
// ---
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type methodREQHttpGet struct {
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event Event
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}
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func ( m methodREQHttpGet ) getKind ( ) Event {
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return m . event
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}
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// handler to do a Http Get.
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func ( m methodREQHttpGet ) handler ( proc process , message Message , node string ) ( [ ] byte , error ) {
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inf := fmt . Errorf ( "<--- REQHttpGet received from: %v, containing: %v" , message . FromNode , message . Data )
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proc . errorKernel . logConsoleOnlyIfDebug ( inf , proc . configuration )
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proc . processes . wg . Add ( 1 )
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go func ( ) {
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defer proc . processes . wg . Done ( )
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switch {
case len ( message . MethodArgs ) < 1 :
er := fmt . Errorf ( "error: methodREQHttpGet: got <1 number methodArgs" )
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proc . errorKernel . errSend ( proc , message , er )
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return
}
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url := message . MethodArgs [ 0 ]
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client := http . Client {
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Timeout : time . Second * time . Duration ( message . MethodTimeout ) ,
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}
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// Get a context with the timeout specified in message.MethodTimeout.
ctx , cancel := getContextForMethodTimeout ( proc . ctx , message )
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req , err := http . NewRequestWithContext ( ctx , http . MethodGet , url , nil )
if err != nil {
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er := fmt . Errorf ( "error: methodREQHttpGet: NewRequest failed: %v, bailing out: %v" , err , message . MethodArgs )
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proc . errorKernel . errSend ( proc , message , er )
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cancel ( )
return
}
outCh := make ( chan [ ] byte )
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proc . processes . wg . Add ( 1 )
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go func ( ) {
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defer proc . processes . wg . Done ( )
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resp , err := client . Do ( req )
if err != nil {
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er := fmt . Errorf ( "error: methodREQHttpGet: client.Do failed: %v, bailing out: %v" , err , message . MethodArgs )
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proc . errorKernel . errSend ( proc , message , er )
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return
}
defer resp . Body . Close ( )
if resp . StatusCode != 200 {
cancel ( )
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er := fmt . Errorf ( "error: methodREQHttpGet: not 200, were %#v, bailing out: %v" , resp . StatusCode , message )
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proc . errorKernel . errSend ( proc , message , er )
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return
}
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body , err := io . ReadAll ( resp . Body )
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if err != nil {
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er := fmt . Errorf ( "error: methodREQHttpGet: io.ReadAll failed : %v, methodArgs: %v" , err , message . MethodArgs )
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proc . errorKernel . errSend ( proc , message , er )
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}
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out := body
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select {
case outCh <- out :
case <- ctx . Done ( ) :
return
}
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} ( )
select {
case <- ctx . Done ( ) :
cancel ( )
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er := fmt . Errorf ( "error: methodREQHttpGet: method timed out: %v" , message . MethodArgs )
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proc . errorKernel . errSend ( proc , message , er )
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case out := <- outCh :
cancel ( )
// Prepare and queue for sending a new message with the output
// of the action executed.
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newReplyMessage ( proc , message , out )
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}
} ( )
ackMsg := [ ] byte ( "confirmed from: " + node + ": " + fmt . Sprint ( message . ID ) )
return ackMsg , nil
}
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// ---
type methodREQHttpGetScheduled struct {
event Event
}
func ( m methodREQHttpGetScheduled ) getKind ( ) Event {
return m . event
}
// handler to do a Http Get Scheduled.
// The second element of the MethodArgs slice holds the timer defined in seconds.
func ( m methodREQHttpGetScheduled ) handler ( proc process , message Message , node string ) ( [ ] byte , error ) {
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inf := fmt . Errorf ( "<--- REQHttpGetScheduled received from: %v, containing: %v" , message . FromNode , message . Data )
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proc . errorKernel . logConsoleOnlyIfDebug ( inf , proc . configuration )
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proc . processes . wg . Add ( 1 )
go func ( ) {
defer proc . processes . wg . Done ( )
// --- Check and prepare the methodArgs
switch {
case len ( message . MethodArgs ) < 3 :
er := fmt . Errorf ( "error: methodREQHttpGet: got <3 number methodArgs. Want URL, Schedule Interval in seconds, and the total time in minutes the scheduler should run for" )
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proc . errorKernel . errSend ( proc , message , er )
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return
}
url := message . MethodArgs [ 0 ]
scheduleInterval , err := strconv . Atoi ( message . MethodArgs [ 1 ] )
if err != nil {
er := fmt . Errorf ( "error: methodREQHttpGetScheduled: schedule interval value is not a valid int number defined as a string value seconds: %v, bailing out: %v" , err , message . MethodArgs )
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proc . errorKernel . errSend ( proc , message , er )
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return
}
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schedulerTotalTime , err := strconv . Atoi ( message . MethodArgs [ 2 ] )
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if err != nil {
er := fmt . Errorf ( "error: methodREQHttpGetScheduled: scheduler total time value is not a valid int number defined as a string value minutes: %v, bailing out: %v" , err , message . MethodArgs )
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proc . errorKernel . errSend ( proc , message , er )
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return
}
// --- Prepare and start the scheduler.
outCh := make ( chan [ ] byte )
ticker := time . NewTicker ( time . Second * time . Duration ( scheduleInterval ) )
// Prepare a context that will be for the schedule as a whole.
// NB: Individual http get's will create their own context's
// derived from this one.
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ctxScheduler , cancel := context . WithTimeout ( proc . ctx , time . Minute * time . Duration ( schedulerTotalTime ) )
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go func ( ) {
// Prepare the http request.
client := http . Client {
Timeout : time . Second * time . Duration ( message . MethodTimeout ) ,
}
for {
select {
case <- ticker . C :
proc . processes . wg . Add ( 1 )
// Get a context with the timeout specified in message.MethodTimeout
// for the individual http requests.
ctx , cancel := getContextForMethodTimeout ( proc . ctx , message )
req , err := http . NewRequestWithContext ( ctx , http . MethodGet , url , nil )
if err != nil {
er := fmt . Errorf ( "error: methodREQHttpGet: NewRequest failed: %v, error: %v" , err , message . MethodArgs )
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proc . errorKernel . errSend ( proc , message , er )
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cancel ( )
return
}
// Run each individual http get in it's own go routine, and
// deliver the result on the outCh.
go func ( ) {
defer proc . processes . wg . Done ( )
resp , err := client . Do ( req )
if err != nil {
er := fmt . Errorf ( "error: methodREQHttpGet: client.Do failed: %v, error: %v" , err , message . MethodArgs )
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proc . errorKernel . errSend ( proc , message , er )
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return
}
defer resp . Body . Close ( )
if resp . StatusCode != 200 {
cancel ( )
er := fmt . Errorf ( "error: methodREQHttpGet: not 200, were %#v, error: %v" , resp . StatusCode , message )
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proc . errorKernel . errSend ( proc , message , er )
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return
}
body , err := io . ReadAll ( resp . Body )
if err != nil {
er := fmt . Errorf ( "error: methodREQHttpGet: io.ReadAll failed : %v, methodArgs: %v" , err , message . MethodArgs )
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proc . errorKernel . errSend ( proc , message , er )
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}
out := body
select {
case outCh <- out :
case <- ctx . Done ( ) :
return
case <- ctxScheduler . Done ( ) :
// If the scheduler context is done then we also want to kill
// all running http request.
cancel ( )
return
}
} ( )
case <- ctxScheduler . Done ( ) :
cancel ( )
return
}
}
} ( )
for {
select {
case <- ctxScheduler . Done ( ) :
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// fmt.Printf(" * DEBUG: <-ctxScheduler.Done()\n")
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cancel ( )
er := fmt . Errorf ( "error: methodREQHttpGet: schedule context timed out: %v" , message . MethodArgs )
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proc . errorKernel . errSend ( proc , message , er )
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return
case out := <- outCh :
// Prepare and queue for sending a new message with the output
// of the action executed.
newReplyMessage ( proc , message , out )
}
}
} ( )
ackMsg := [ ] byte ( "confirmed from: " + node + ": " + fmt . Sprint ( message . ID ) )
return ackMsg , nil
}
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// --- methodREQTailFile
type methodREQTailFile struct {
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event Event
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}
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func ( m methodREQTailFile ) getKind ( ) Event {
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return m . event
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}
// handler to run a tailing of files with timeout context. The handler will
// return the output of the command run back to the calling publisher
// as a new message.
func ( m methodREQTailFile ) handler ( proc process , message Message , node string ) ( [ ] byte , error ) {
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inf := fmt . Errorf ( "<--- TailFile REQUEST received from: %v, containing: %v" , message . FromNode , message . Data )
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proc . errorKernel . logConsoleOnlyIfDebug ( inf , proc . configuration )
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proc . processes . wg . Add ( 1 )
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go func ( ) {
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defer proc . processes . wg . Done ( )
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switch {
case len ( message . MethodArgs ) < 1 :
er := fmt . Errorf ( "error: methodREQTailFile: got <1 number methodArgs" )
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proc . errorKernel . errSend ( proc , message , er )
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return
}
2021-09-16 09:51:34 +00:00
fp := message . MethodArgs [ 0 ]
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// var ctx context.Context
// var cancel context.CancelFunc
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// Get a context with the timeout specified in message.MethodTimeout.
ctx , cancel := getContextForMethodTimeout ( proc . ctx , message )
// Note: Replacing the 0 timeout with specific timeout.
// if message.MethodTimeout != 0 {
// ctx, cancel = context.WithTimeout(proc.ctx, time.Second*time.Duration(message.MethodTimeout))
// } else {
// ctx, cancel = context.WithCancel(proc.ctx)
// }
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outCh := make ( chan [ ] byte )
2021-04-16 21:58:43 +00:00
t , err := tail . TailFile ( fp , tail . Config { Follow : true , Location : & tail . SeekInfo {
Offset : 0 ,
Whence : os . SEEK_END ,
} } )
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if err != nil {
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er := fmt . Errorf ( "error: methodREQToTailFile: tailFile: %v" , err )
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proc . errorKernel . errSend ( proc , message , er )
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}
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proc . processes . wg . Add ( 1 )
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go func ( ) {
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defer proc . processes . wg . Done ( )
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for {
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select {
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case line := <- t . Lines :
outCh <- [ ] byte ( line . Text + "\n" )
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case <- ctx . Done ( ) :
return
}
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}
} ( )
for {
select {
case <- ctx . Done ( ) :
cancel ( )
// Close the lines channel so we exit the reading lines
// go routine.
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// close(t.Lines)
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er := fmt . Errorf ( "info: method timeout reached REQTailFile, canceling: %v" , message . MethodArgs )
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proc . errorKernel . infoSend ( proc , message , er )
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return
case out := <- outCh :
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2021-04-13 09:28:52 +00:00
// Prepare and queue for sending a new message with the output
// of the action executed.
2021-04-13 13:28:54 +00:00
newReplyMessage ( proc , message , out )
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}
}
} ( )
ackMsg := [ ] byte ( "confirmed from: " + node + ": " + fmt . Sprint ( message . ID ) )
return ackMsg , nil
}
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// ---
2021-09-17 08:17:10 +00:00
type methodREQCliCommandCont struct {
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event Event
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}
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func ( m methodREQCliCommandCont ) getKind ( ) Event {
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return m . event
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}
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// Handler to run REQCliCommandCont, which is the same as normal
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// Cli command, but can be used when running a command that will take
// longer time and you want to send the output of the command continually
// back as it is generated, and not just when the command is finished.
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func ( m methodREQCliCommandCont ) handler ( proc process , message Message , node string ) ( [ ] byte , error ) {
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inf := fmt . Errorf ( "<--- CLInCommandCont REQUEST received from: %v, containing: %v" , message . FromNode , message . Data )
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proc . errorKernel . logConsoleOnlyIfDebug ( inf , proc . configuration )
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// Execute the CLI command in it's own go routine, so we are able
// to return immediately with an ack reply that the message was
// received, and we create a new message to send back to the calling
// node for the out put of the actual command.
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proc . processes . wg . Add ( 1 )
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go func ( ) {
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defer proc . processes . wg . Done ( )
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defer func ( ) {
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// fmt.Printf(" * DONE *\n")
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} ( )
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var a [ ] string
switch {
case len ( message . MethodArgs ) < 1 :
er := fmt . Errorf ( "error: methodREQCliCommand: got <1 number methodArgs" )
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proc . errorKernel . errSend ( proc , message , er )
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return
case len ( message . MethodArgs ) >= 0 :
a = message . MethodArgs [ 1 : ]
}
2021-09-16 09:51:34 +00:00
c := message . MethodArgs [ 0 ]
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// Get a context with the timeout specified in message.MethodTimeout.
ctx , cancel := getContextForMethodTimeout ( proc . ctx , message )
// deadline, _ := ctx.Deadline()
// fmt.Printf(" * DEBUG * deadline : %v\n", deadline)
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outCh := make ( chan [ ] byte )
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errCh := make ( chan string )
2021-06-08 18:52:45 +00:00
2021-08-12 10:27:47 +00:00
proc . processes . wg . Add ( 1 )
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go func ( ) {
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defer proc . processes . wg . Done ( )
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2021-06-08 18:52:45 +00:00
cmd := exec . CommandContext ( ctx , c , a ... )
// Using cmd.StdoutPipe here so we are continuosly
// able to read the out put of the command.
outReader , err := cmd . StdoutPipe ( )
if err != nil {
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er := fmt . Errorf ( "error: methodREQCliCommandCont: cmd.StdoutPipe failed : %v, methodArgs: %v" , err , message . MethodArgs )
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proc . errorKernel . errSend ( proc , message , er )
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}
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ErrorReader , err := cmd . StderrPipe ( )
if err != nil {
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er := fmt . Errorf ( "error: methodREQCliCommandCont: cmd.StderrPipe failed : %v, methodArgs: %v" , err , message . MethodArgs )
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proc . errorKernel . errSend ( proc , message , er )
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}
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if err := cmd . Start ( ) ; err != nil {
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er := fmt . Errorf ( "error: methodREQCliCommandCont: cmd.Start failed : %v, methodArgs: %v" , err , message . MethodArgs )
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proc . errorKernel . errSend ( proc , message , er )
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}
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go func ( ) {
scanner := bufio . NewScanner ( ErrorReader )
for scanner . Scan ( ) {
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errCh <- scanner . Text ( )
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}
} ( )
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go func ( ) {
scanner := bufio . NewScanner ( outReader )
for scanner . Scan ( ) {
outCh <- [ ] byte ( scanner . Text ( ) + "\n" )
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}
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} ( )
2021-08-12 10:27:47 +00:00
2021-09-27 12:45:49 +00:00
// NB: sending cancel to command context, so processes are killed.
// A github issue is filed on not killing all child processes when using pipes:
// https://github.com/golang/go/issues/23019
// TODO: Check in later if there are any progress on the issue.
// When testing the problem seems to appear when using sudo, or tcpdump without
// the -l option. So for now, don't use sudo, and remember to use -l with tcpdump
// which makes stdout line buffered.
<- ctx . Done ( )
cancel ( )
if err := cmd . Wait ( ) ; err != nil {
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er := fmt . Errorf ( "info: methodREQCliCommandCont: method timeout reached, canceled: methodArgs: %v, %v" , message . MethodArgs , err )
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proc . errorKernel . errSend ( proc , message , er )
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}
} ( )
// Check if context timer or command output were received.
for {
select {
case <- ctx . Done ( ) :
cancel ( )
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er := fmt . Errorf ( "info: methodREQCliCommandCont: method timeout reached, canceling: methodArgs: %v" , message . MethodArgs )
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proc . errorKernel . infoSend ( proc , message , er )
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return
case out := <- outCh :
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// fmt.Printf(" * out: %v\n", string(out))
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newReplyMessage ( proc , message , out )
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case out := <- errCh :
newReplyMessage ( proc , message , [ ] byte ( out ) )
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}
}
} ( )
ackMsg := [ ] byte ( "confirmed from: " + node + ": " + fmt . Sprint ( message . ID ) )
return ackMsg , nil
}
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// ---
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type methodREQRelayInitial struct {
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event Event
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}
2022-01-27 06:19:04 +00:00
func ( m methodREQRelayInitial ) getKind ( ) Event {
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return m . event
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}
// Handler to relay messages via a host.
func ( m methodREQRelayInitial ) handler ( proc process , message Message , node string ) ( [ ] byte , error ) {
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proc . processes . wg . Add ( 1 )
go func ( ) {
defer proc . processes . wg . Done ( )
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2022-01-26 14:35:31 +00:00
// Get a context with the timeout specified in message.MethodTimeout.
ctx , cancel := getContextForMethodTimeout ( proc . ctx , message )
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defer cancel ( )
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outCh := make ( chan [ ] byte )
errCh := make ( chan error )
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nothingCh := make ( chan struct { } , 1 )
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var out [ ] byte
// If the actual Method for the message is REQCopyFileFrom we need to
// do the actual file reading here so we can fill the data field of the
// message with the content of the file before relaying it.
switch {
case message . RelayOriginalMethod == REQCopyFileFrom :
switch {
case len ( message . MethodArgs ) < 3 :
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er := fmt . Errorf ( "error: methodREQRelayInitial: got <3 number methodArgs: want srcfilePath,dstNode,dstFilePath" )
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proc . errorKernel . errSend ( proc , message , er )
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return
}
SrcFilePath := message . MethodArgs [ 0 ]
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//DstFilePath := message.MethodArgs[2]
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// Read the file, and put the result on the out channel to be sent when done reading.
proc . processes . wg . Add ( 1 )
go copyFileFrom ( ctx , & proc . processes . wg , SrcFilePath , errCh , outCh )
// Since we now have read the source file we don't need the REQCopyFileFrom
// request method anymore, so we change the original method of the message
// so it will write the data after the relaying.
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//dstDir := filepath.Dir(DstFilePath)
//dstFile := filepath.Base(DstFilePath)
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message . RelayOriginalMethod = REQCopyFileTo
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//message.FileName = dstFile
//message.Directory = dstDir
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default :
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// No request type that need special handling if relayed, so we should signal that
// there is nothing to do for the select below.
// We need to do this signaling in it's own go routine here, so we don't block here
// since the select below is in the same function.
go func ( ) {
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nothingCh <- struct { } { }
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} ( )
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}
select {
case <- ctx . Done ( ) :
er := fmt . Errorf ( "error: methodREQRelayInitial: CopyFromFile: got <-ctx.Done(): %v" , message . MethodArgs )
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proc . errorKernel . errSend ( proc , message , er )
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return
case er := <- errCh :
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proc . errorKernel . errSend ( proc , message , er )
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return
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case <- nothingCh :
// Do nothing.
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case out = <- outCh :
}
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// relay the message to the actual host here by prefixing the the RelayToNode
// to the subject.
relayTo := fmt . Sprintf ( "%v.%v" , message . RelayToNode , message . RelayOriginalViaNode )
// message.ToNode = message.RelayOriginalViaNode
message . ToNode = Node ( relayTo )
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message . FromNode = Node ( node )
message . Method = REQRelay
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message . Data = out
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sam , err := newSubjectAndMessage ( message )
if err != nil {
er := fmt . Errorf ( "error: newSubjectAndMessage : %v, message: %v" , err , message )
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proc . errorKernel . errSend ( proc , message , er )
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}
proc . toRingbufferCh <- [ ] subjectAndMessage { sam }
} ( )
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// Send back an ACK message.
ackMsg := [ ] byte ( "confirmed REQRelay from: " + node + ": " + fmt . Sprint ( message . ID ) )
return ackMsg , nil
}
// ----
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type methodREQRelay struct {
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event Event
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}
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func ( m methodREQRelay ) getKind ( ) Event {
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return m . event
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}
// Handler to relay messages via a host.
func ( m methodREQRelay ) handler ( proc process , message Message , node string ) ( [ ] byte , error ) {
// relay the message here to the actual host here.
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proc . processes . wg . Add ( 1 )
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go func ( ) {
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defer proc . processes . wg . Done ( )
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message . ToNode = message . RelayToNode
message . FromNode = Node ( node )
message . Method = message . RelayOriginalMethod
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sam , err := newSubjectAndMessage ( message )
if err != nil {
er := fmt . Errorf ( "error: newSubjectAndMessage : %v, message: %v" , err , message )
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proc . errorKernel . errSend ( proc , message , er )
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return
}
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select {
case proc . toRingbufferCh <- [ ] subjectAndMessage { sam } :
case <- proc . ctx . Done ( ) :
}
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} ( )
// Send back an ACK message.
ackMsg := [ ] byte ( "confirmed from: " + node + ": " + fmt . Sprint ( message . ID ) )
return ackMsg , nil
}
// ----
type methodREQPublicKey struct {
event Event
}
func ( m methodREQPublicKey ) getKind ( ) Event {
return m . event
}
// Handler to get the public ed25519 key from a node.
func ( m methodREQPublicKey ) handler ( proc process , message Message , node string ) ( [ ] byte , error ) {
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// Get a context with the timeout specified in message.MethodTimeout.
ctx , _ := getContextForMethodTimeout ( proc . ctx , message )
proc . processes . wg . Add ( 1 )
go func ( ) {
defer proc . processes . wg . Done ( )
outCh := make ( chan [ ] byte )
go func ( ) {
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// Normally we would do some logic here, where the result is passed to outCh when done,
// so we can split up the working logic, and f.ex. sending a reply logic.
// In this case this go func and the below select is not needed, but keeping it so the
// structure is the same as the other handlers.
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select {
case <- ctx . Done ( ) :
case outCh <- proc . signatures . SignPublicKey :
}
} ( )
select {
// case proc.toRingbufferCh <- []subjectAndMessage{sam}:
case <- ctx . Done ( ) :
case out := <- outCh :
// Prepare and queue for sending a new message with the output
// of the action executed.
newReplyMessage ( proc , message , out )
}
} ( )
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// Send back an ACK message.
ackMsg := [ ] byte ( "confirmed from: " + node + ": " + fmt . Sprint ( message . ID ) )
return ackMsg , nil
}
// ----
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type methodREQPublicKeysGet struct {
event Event
}
func ( m methodREQPublicKeysGet ) getKind ( ) Event {
return m . event
}
// Handler to get all the public ed25519 keys from a central server.
func ( m methodREQPublicKeysGet ) handler ( proc process , message Message , node string ) ( [ ] byte , error ) {
// Get a context with the timeout specified in message.MethodTimeout.
// TODO:
// - Since this is implemented as a NACK message we could implement a
// metric thats shows the last time a node did a key request.
// - We could also implement a metrics on the receiver showing the last
// time a node had done an update.
ctx , _ := getContextForMethodTimeout ( proc . ctx , message )
proc . processes . wg . Add ( 1 )
go func ( ) {
defer proc . processes . wg . Done ( )
outCh := make ( chan [ ] byte )
go func ( ) {
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// Normally we would do some logic here, where the result is passed to outCh when done,
// so we can split up the working logic, and f.ex. sending a reply logic.
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// In this case this go func and the below select is not needed, but keeping it so the
// structure is the same as the other handlers.
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select {
case <- ctx . Done ( ) :
// TODO: Should we receive a hash of he current keys from the node here
// to verify if we need to update or not ?
case outCh <- [ ] byte { } :
}
} ( )
select {
case <- ctx . Done ( ) :
// case out := <-outCh:
case <- outCh :
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proc . centralAuth . nodePublicKeys . mu . Lock ( )
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b , err := json . Marshal ( proc . centralAuth . nodePublicKeys . KeyMap )
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proc . centralAuth . nodePublicKeys . mu . Unlock ( )
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if err != nil {
er := fmt . Errorf ( "error: REQPublicKeysGet, failed to marshal keys map: %v" , err )
proc . errorKernel . errSend ( proc , message , er )
}
newReplyMessage ( proc , message , b )
}
} ( )
// NB: We're not sending an ACK message for this request type.
return nil , nil
}
// ----
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type methodREQPublicKeysToNode struct {
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event Event
}
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func ( m methodREQPublicKeysToNode ) getKind ( ) Event {
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return m . event
}
// Handler to put the public key replies received from a central server.
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func ( m methodREQPublicKeysToNode ) handler ( proc process , message Message , node string ) ( [ ] byte , error ) {
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// Get a context with the timeout specified in message.MethodTimeout.
// TODO:
// - Since this is implemented as a NACK message we could implement a
// metric thats shows the last time keys were updated.
ctx , _ := getContextForMethodTimeout ( proc . ctx , message )
proc . processes . wg . Add ( 1 )
go func ( ) {
defer proc . processes . wg . Done ( )
outCh := make ( chan [ ] byte )
go func ( ) {
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// Normally we would do some logic here, where the result is passed to outCh when done,
// so we can split up the working logic, and f.ex. sending a reply logic.
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// In this case this go func and the below select is not needed, but keeping it so the
// structure is the same as the other handlers.
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select {
case <- ctx . Done ( ) :
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// TODO: Should we receive a hash of he current keys from the node here ?
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case outCh <- [ ] byte { } :
}
} ( )
select {
// case proc.toRingbufferCh <- []subjectAndMessage{sam}:
case <- ctx . Done ( ) :
case <- outCh :
keys := make ( map [ Node ] string )
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err := json . Unmarshal ( message . Data , & keys )
if err != nil {
er := fmt . Errorf ( "error: REQPublicKeysToNode : json unmarshal failed: %v, message: %v" , err , message )
proc . errorKernel . errSend ( proc , message , er )
}
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fmt . Printf ( " *** RECEIVED KEYS: %v\n" , keys )
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// TODO:
// - We need to store the public keys in a map in signatures.go
// - We should also persist that public keys map to file, so we can read
// that file on startup to get all the previosly received keys.
// - The store to map and also that map to file should happen with a method
// on signatures.publicKeys, so we do both in one go.
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// Prepare and queue for sending a new message with the output
// of the action executed.
// newReplyMessage(proc, message, out)
}
} ( )
// Send back an ACK message.
// ackMsg := []byte("confirmed from: " + node + ": " + fmt.Sprint(message.ID))
return nil , nil
}
// ----
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type methodREQPublicKeysAllow struct {
event Event
}
func ( m methodREQPublicKeysAllow ) getKind ( ) Event {
return m . event
}
// Handler to get all the public ed25519 keys from a central server.
func ( m methodREQPublicKeysAllow ) handler ( proc process , message Message , node string ) ( [ ] byte , error ) {
// Get a context with the timeout specified in message.MethodTimeout.
ctx , _ := getContextForMethodTimeout ( proc . ctx , message )
proc . processes . wg . Add ( 1 )
go func ( ) {
defer proc . processes . wg . Done ( )
outCh := make ( chan [ ] byte )
go func ( ) {
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// Normally we would do some logic here, where the result is passed to outCh when done,
// so we can split up the working logic, and f.ex. sending a reply logic.
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// In this case this go func and the below select is not needed, but keeping it so the
// structure is the same as the other handlers.
select {
case <- ctx . Done ( ) :
case outCh <- [ ] byte { } :
}
} ( )
select {
case <- ctx . Done ( ) :
case <- outCh :
proc . centralAuth . nodeNotAckedPublicKeys . mu . Lock ( )
defer proc . centralAuth . nodeNotAckedPublicKeys . mu . Unlock ( )
for _ , n := range message . MethodArgs {
key , ok := proc . centralAuth . nodeNotAckedPublicKeys . KeyMap [ Node ( n ) ]
if ok {
// Store/update the node and public key on the allowed pubKey map.
proc . centralAuth . nodePublicKeys . mu . Lock ( )
proc . centralAuth . nodePublicKeys . KeyMap [ Node ( n ) ] = key
proc . centralAuth . nodePublicKeys . mu . Unlock ( )
// Add key to persistent storage.
proc . centralAuth . dbUpdatePublicKey ( string ( n ) , key )
// Delete the key from the NotAcked map
delete ( proc . centralAuth . nodeNotAckedPublicKeys . KeyMap , Node ( n ) )
er := fmt . Errorf ( "info: REQPublicKeysAllow : allowed new/updated public key for %v to allowed public key map" , n )
proc . errorKernel . infoSend ( proc , message , er )
}
}
}
} ( )
ackMsg := [ ] byte ( "confirmed from: " + node + ": " + fmt . Sprint ( message . ID ) )
return ackMsg , nil
}
// ----
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// ---- Template that can be used for creating request methods
// func (m methodREQCopyFileTo) handler(proc process, message Message, node string) ([]byte, error) {
//
// proc.processes.wg.Add(1)
// go func() {
// defer proc.processes.wg.Done()
//
// ctx, cancel := context.WithTimeout(proc.ctx, time.Second*time.Duration(message.MethodTimeout))
// defer cancel()
//
// // Put data that should be the result of the action done in the inner
// // go routine on the outCh.
// outCh := make(chan []byte)
// // Put errors from the inner go routine on the errCh.
// errCh := make(chan error)
//
// proc.processes.wg.Add(1)
// go func() {
// defer proc.processes.wg.Done()
//
// // Do some work here....
//
// }()
//
// // Wait for messages received from the inner go routine.
// select {
// case <-ctx.Done():
// fmt.Printf(" ** DEBUG: got ctx.Done\n")
//
// er := fmt.Errorf("error: methodREQ...: got <-ctx.Done(): %v", message.MethodArgs)
// sendErrorLogMessage(proc.configuration, proc.processes.metrics, proc.toRingbufferCh, proc.node, er)
// return
//
// case er := <-errCh:
// sendErrorLogMessage(proc.configuration, proc.processes.metrics, proc.toRingbufferCh, proc.node, er)
// return
//
// case out := <-outCh:
// replyData := fmt.Sprintf("info: succesfully created and wrote the file %v\n", out)
// newReplyMessage(proc, message, []byte(replyData))
// return
// }
//
// }()
//
// ackMsg := []byte("confirmed from: " + node + ": " + fmt.Sprint(message.ID))
// return ackMsg, nil
// }