mirror of
https://github.com/postmannen/ctrl.git
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1230 lines
39 KiB
Go
1230 lines
39 KiB
Go
// The structure of how to add new method types to the system.
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// -----------------------------------------------------------
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// All methods need 3 things:
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// - A type definition
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// - The type needs a getKind method
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// - The type needs a handler method
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// Overall structure example shown below.
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//
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// ---
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// type methodCommandCLICommandRequest struct {
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// commandOrEvent CommandOrEvent
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// }
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//
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// func (m methodCommandCLICommandRequest) getKind() CommandOrEvent {
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// return m.commandOrEvent
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// }
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//
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// func (m methodCommandCLICommandRequest) handler(s *server, message Message, node string) ([]byte, error) {
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// ...
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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))
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// return ackMsg, nil
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// }
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//
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// ---
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// You also need to make a constant for the Method, and add
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// that constant as the key in the map, where the value is
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// the actual type you want to map it to with a handler method.
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// You also specify if it is a Command or Event, and if it is
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// ACK or NACK.
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// Check out the existing code below for more examples.
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package steward
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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"
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"log"
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"net/http"
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"os"
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"os/exec"
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"path/filepath"
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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
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// is represented in a typed manner.
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type Method string
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// ------------------------------------------------------------
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// The constants that will be used throughout the system for
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// when specifying what kind of Method to send or work with.
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const (
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// Initial parent method used to start other processes.
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REQInitial Method = "REQInitial"
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// Command for client operation request of the system. The op
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// command to execute shall be given in the data field of the
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// message as string value. For example "ps".
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REQOpCommand Method = "REQOpCommand"
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// Execute a CLI command in for example bash or cmd.
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// This is an event type, where a message will be sent to a
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// node with the command to execute and an ACK will be replied
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// if it was delivered succesfully. The output of the command
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// ran will be delivered back to the node where it was initiated
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// as a new message.
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// The data field is a slice of strings where the first string
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// 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
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// 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.
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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
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// value should be the command, and the following the arguments.
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REQToConsole Method = "REQToConsole"
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// Send text logging to some host by appending the output to a
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// 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
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// the receiving end.
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// The data field is a slice of strings where the values of the
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// 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
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// the fileoutput 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
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// the receiving end.
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// The data field is a slice of strings where the values of the
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// slice will be written to the file.
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REQToFile Method = "REQToFile"
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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
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// 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
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REQHttpGet Method = "REQHttpGet"
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// Tail file
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REQTailFile Method = "REQTailFile"
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// Write to steward socket
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REQToSocket Method = "REQToSocket"
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)
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// The mapping of all the method constants specified, what type
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// it references, and the kind if it is an Event or Command, and
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// if it is ACK or NACK.
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// Allowed values for the commandOrEvent field are:
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// - CommandACK
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// - CommandNACK
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// - EventACK
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// - EventNack
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func (m Method) GetMethodsAvailable() MethodsAvailable {
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// Command, Used to make a request to perform an action
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// Event, Used to communicate that something have happened.
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ma := MethodsAvailable{
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Methodhandlers: map[Method]methodHandler{
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REQInitial: methodREQInitial{
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commandOrEvent: CommandACK,
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},
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REQOpCommand: methodREQOpCommand{
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commandOrEvent: CommandACK,
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},
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REQCliCommand: methodREQCliCommand{
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commandOrEvent: CommandACK,
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},
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REQCliCommandCont: methodREQCliCommandCont{
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commandOrEvent: CommandACK,
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},
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REQToConsole: methodREQToConsole{
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commandOrEvent: EventACK,
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},
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REQToFileAppend: methodREQToFileAppend{
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commandOrEvent: EventACK,
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},
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REQToFile: methodREQToFile{
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commandOrEvent: EventACK,
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},
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REQHello: methodREQHello{
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commandOrEvent: EventNACK,
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},
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REQErrorLog: methodREQErrorLog{
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commandOrEvent: EventACK,
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},
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REQPing: methodREQPing{
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commandOrEvent: EventACK,
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},
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REQPong: methodREQPong{
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commandOrEvent: EventACK,
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},
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REQHttpGet: methodREQHttpGet{
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commandOrEvent: EventACK,
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},
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REQTailFile: methodREQTailFile{
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commandOrEvent: EventACK,
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},
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REQToSocket: methodREQToSocket{
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commandOrEvent: EventACK,
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},
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},
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}
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return ma
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}
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// Reply methods. The slice generated here is primarily used within
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// the Stew client for knowing what of the req types are generally
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// used as reply methods.
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func (m Method) GetReplyMethods() []Method {
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rm := []Method{REQToConsole, REQToFile, REQToFileAppend, REQToSocket}
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return rm
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}
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// getHandler will check the methodsAvailable map, and return the
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// method handler for the method given
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// as input argument.
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func (m Method) getHandler(method Method) methodHandler {
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ma := m.GetMethodsAvailable()
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mh := ma.Methodhandlers[method]
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return mh
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}
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// The structure that works as a reference for all the methods and if
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// they are of the command or event type, and also if it is a ACK or
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// NACK message.
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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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commandOrEvent CommandOrEvent
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}
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func (m methodREQInitial) getKind() CommandOrEvent {
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return m.commandOrEvent
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}
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func (m methodREQInitial) handler(proc process, message Message, node string) ([]byte, error) {
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// proc.procFuncCh <- message
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ackMsg := []byte("confirmed from: " + node + ": " + fmt.Sprint(message.ID))
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return ackMsg, nil
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}
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// ----
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// MethodsAvailable holds a map of all the different method types and the
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// 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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}
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// Check if exists will check if the Method is defined. If true the bool
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// value will be set to true, and the methodHandler function for that type
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// will be returned.
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func (ma MethodsAvailable) CheckIfExists(m Method) (methodHandler, bool) {
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mFunc, ok := ma.Methodhandlers[m]
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if ok {
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// fmt.Printf("******THE TOPIC EXISTS: %v******\n", m)
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return mFunc, true
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} else {
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// fmt.Printf("******THE TOPIC DO NOT EXIST: %v******\n", m)
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return nil, false
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}
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}
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// Create a new message for the reply containing the output of the
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// action executed put in outData, and put it on the ringbuffer to
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// be published.
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// The method to use for the reply message should initially be
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// specified within the first message as the replyMethod, and we will
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// pick up that value here, and use it as the method for the new
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// request message. If no replyMethod is set we default to the
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// REQToFileAppend method type.
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func newReplyMessage(proc process, message Message, outData []byte) {
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// If no replyMethod is set we default to writing to writing to
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// a log file.
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if message.ReplyMethod == "" {
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message.ReplyMethod = REQToFileAppend
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}
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// Create a new message for the reply, and put it on the
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// ringbuffer to be published.
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newMsg := Message{
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ToNode: message.FromNode,
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Data: []string{string(outData)},
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Method: message.ReplyMethod,
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MethodArgs: message.ReplyMethodArgs,
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MethodTimeout: message.ReplyMethodTimeout,
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ACKTimeout: message.ReplyACKTimeout,
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Retries: message.ReplyRetries,
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// Put in a copy of the initial request message, so we can use it's properties if
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// needed to for example create the file structure naming on the subscriber.
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PreviousMessage: &message,
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}
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sam, err := newSubjectAndMessage(newMsg)
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if err != nil {
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// In theory the system should drop the message before it reaches here.
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er := fmt.Errorf("error: newReplyMessage : %v, message: %v", err, message)
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sendErrorLogMessage(proc.configuration, proc.processes.metrics, proc.toRingbufferCh, proc.node, er)
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log.Printf("%v\n", 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
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// structure to use for the reply data.
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// It will return the filename, and the tree structure for the folders
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// to create.
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func selectFileNaming(message Message, proc process) (string, string) {
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var fileName string
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var folderTree string
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switch {
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case message.PreviousMessage == nil:
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// If this was a direct request there are no previous message to take
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// information from, so we use the one that are in the current mesage.
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fileName = message.FileName
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folderTree = filepath.Join(proc.configuration.SubscribersDataFolder, message.Directory, string(message.ToNode))
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case message.PreviousMessage.ToNode != "":
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fileName = message.PreviousMessage.FileName
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folderTree = filepath.Join(proc.configuration.SubscribersDataFolder, message.PreviousMessage.Directory, string(message.PreviousMessage.ToNode))
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case message.PreviousMessage.ToNode == "":
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fileName = message.PreviousMessage.FileName
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folderTree = filepath.Join(proc.configuration.SubscribersDataFolder, message.PreviousMessage.Directory, string(message.FromNode))
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}
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return fileName, folderTree
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}
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// ------------------------------------------------------------
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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() CommandOrEvent
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}
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// -----
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type methodREQOpCommand struct {
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commandOrEvent CommandOrEvent
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}
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func (m methodREQOpCommand) getKind() CommandOrEvent {
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return m.commandOrEvent
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}
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type OpCmdStartProc struct {
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Method Method `json:"method"`
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AllowedNodes []Node `json:"allowedNodes"`
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}
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type OpCmdStopProc struct {
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RecevingNode Node `json:"receivingNode"`
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Method Method `json:"method"`
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Kind processKind `json:"kind"`
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ID int `json:"id"`
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}
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// handler to run a CLI command with timeout context. The handler will
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// return the output of the command run back to the calling publisher
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// in the ack message.
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func (m methodREQOpCommand) handler(proc process, message Message, nodeName string) ([]byte, error) {
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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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out := []byte{}
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// unmarshal the json.RawMessage field called OpArgs.
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//
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// Dst interface is the generic type to Unmarshal OpArgs into, and we will
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// set the type it should contain depending on the value specified in Cmd.
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var dst interface{}
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switch message.Operation.OpCmd {
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case "ps":
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proc.processes.mu.Lock()
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// Loop the the processes map, and find all that is active to
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// be returned in the reply message.
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for _, idMap := range proc.processes.active {
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for _, v := range idMap {
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s := fmt.Sprintf("%v, proc: %v, id: %v, name: %v, allowed from: %s\n", time.Now().Format("Mon Jan _2 15:04:05 2006"), v.processKind, v.processID, v.subject.name(), v.allowedReceivers)
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sb := []byte(s)
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out = append(out, sb...)
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}
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}
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proc.processes.mu.Unlock()
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case "startProc":
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// Set the empty interface type dst to &OpStart.
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dst = &OpCmdStartProc{}
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err := json.Unmarshal(message.Operation.OpArg, &dst)
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if err != nil {
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er := fmt.Errorf("error: methodREQOpCommand startProc json.Umarshal failed : %v, message: %v", err, message)
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sendErrorLogMessage(proc.configuration, proc.processes.metrics, proc.toRingbufferCh, proc.node, er)
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log.Printf("%v\n", er)
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}
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// Assert it into the correct non pointer value.
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arg := *dst.(*OpCmdStartProc)
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//fmt.Printf(" ** Content of Arg = %#v\n", arg)
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if len(arg.AllowedNodes) == 0 {
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er := fmt.Errorf("error: startProc: no allowed publisher nodes specified: %v" + fmt.Sprint(message))
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sendErrorLogMessage(proc.configuration, proc.processes.metrics, proc.toRingbufferCh, proc.node, er)
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log.Printf("%v\n", er)
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return
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}
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if arg.Method == "" {
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er := fmt.Errorf("error: startProc: no method specified: %v" + fmt.Sprint(message))
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sendErrorLogMessage(proc.configuration, proc.processes.metrics, proc.toRingbufferCh, proc.node, er)
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log.Printf("%v\n", er)
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return
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}
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// Create the process and start it.
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sub := newSubject(arg.Method, proc.configuration.NodeName)
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procNew := newProcess(proc.ctx, proc.processes.metrics, proc.natsConn, proc.processes, proc.toRingbufferCh, proc.configuration, sub, proc.errorCh, processKindSubscriber, nil)
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go procNew.spawnWorker(proc.processes, proc.natsConn)
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er := fmt.Errorf("info: startProc: started id: %v, subject: %v: node: %v", procNew.processID, sub, message.ToNode)
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sendErrorLogMessage(proc.configuration, proc.processes.metrics, proc.toRingbufferCh, proc.node, er)
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case "stopProc":
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// Set the interface type dst to &OpStart.
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dst = &OpCmdStopProc{}
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err := json.Unmarshal(message.Operation.OpArg, &dst)
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if err != nil {
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er := fmt.Errorf("error: methodREQOpCommand stopProc json.Umarshal failed : %v, message: %v", err, message)
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sendErrorLogMessage(proc.configuration, proc.processes.metrics, proc.toRingbufferCh, proc.node, er)
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log.Printf("%v\n", er)
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}
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// Assert it into the correct non pointer value.
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arg := *dst.(*OpCmdStopProc)
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// Based on the arg values received in the message we create a
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// processName structure as used in naming the real processes.
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// We can then use this processName to get the real values for the
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// actual process we want to stop.
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sub := newSubject(arg.Method, string(arg.RecevingNode))
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processName := processNameGet(sub.name(), arg.Kind)
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// Check if the message contains an id.
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err = func() error {
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if arg.ID == 0 {
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er := fmt.Errorf("error: stopProc: did not find process to stop: %v on %v", sub, message.ToNode)
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sendErrorLogMessage(proc.configuration, proc.processes.metrics, proc.toRingbufferCh, proc.node, er)
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return er
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}
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return nil
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}()
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|
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if err != nil {
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er := fmt.Errorf("error: stopProc: err was not nil: %v : %v on %v", err, sub, message.ToNode)
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sendErrorLogMessage(proc.configuration, proc.processes.metrics, proc.toRingbufferCh, proc.node, er)
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log.Printf("%v\n", er)
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return
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}
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proc.processes.mu.Lock()
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// Remove the process from the processes active map if found.
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toStopProc, ok := proc.processes.active[processName][arg.ID]
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if ok {
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// Delete the process from the processes map
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delete(proc.processes.active, processName)
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// Stop started go routines that belong to the process.
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toStopProc.ctxCancel()
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// Stop subscribing for messages on the process's subject.
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err := toStopProc.natsSubscription.Unsubscribe()
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if err != nil {
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er := fmt.Errorf("error: methodREQOpCommand, toStopProc, failed to stop nats.Subscription: %v, message: %v", err, message)
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sendErrorLogMessage(proc.configuration, proc.processes.metrics, proc.toRingbufferCh, proc.node, er)
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log.Printf("%v\n", er)
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}
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|
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// Remove the prometheus label
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proc.processes.metrics.promProcessesAllRunning.Delete(prometheus.Labels{"processName": string(processName)})
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|
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er := fmt.Errorf("info: stopProc: stopped %v on %v", sub, message.ToNode)
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sendErrorLogMessage(proc.configuration, proc.processes.metrics, proc.toRingbufferCh, proc.node, er)
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log.Printf("%v\n", er)
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newReplyMessage(proc, message, []byte(er.Error()))
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|
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} else {
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er := fmt.Errorf("error: stopProc: methodREQOpCommand, did not find process to stop: %v on %v", sub, message.ToNode)
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sendErrorLogMessage(proc.configuration, proc.processes.metrics, proc.toRingbufferCh, proc.node, er)
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log.Printf("%v\n", er)
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newReplyMessage(proc, message, []byte(er.Error()))
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}
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proc.processes.mu.Unlock()
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}
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newReplyMessage(proc, message, out)
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}()
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|
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ackMsg := []byte(fmt.Sprintf("confirmed from node: %v: messageID: %v\n---\n", proc.node, message.ID))
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return ackMsg, nil
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}
|
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|
|
//----
|
|
|
|
type methodREQToFileAppend struct {
|
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commandOrEvent CommandOrEvent
|
|
}
|
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|
|
func (m methodREQToFileAppend) getKind() CommandOrEvent {
|
|
return m.commandOrEvent
|
|
}
|
|
|
|
// Handle appending data to file.
|
|
func (m methodREQToFileAppend) handler(proc process, message Message, node string) ([]byte, error) {
|
|
|
|
// 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.
|
|
fileName, folderTree := selectFileNaming(message, proc)
|
|
|
|
// 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 {
|
|
er := fmt.Errorf("error: methodREQToFileAppend failed to create toFileAppend directory tree:%v, %v, message: %v", folderTree, err, message)
|
|
sendErrorLogMessage(proc.configuration, proc.processes.metrics, proc.toRingbufferCh, proc.node, er)
|
|
log.Printf("%v\n", er)
|
|
}
|
|
|
|
log.Printf("info: Creating subscribers data folder at %v\n", folderTree)
|
|
}
|
|
|
|
// Open file and write data.
|
|
file := filepath.Join(folderTree, fileName)
|
|
f, err := os.OpenFile(file, os.O_APPEND|os.O_RDWR|os.O_CREATE|os.O_SYNC, 0600)
|
|
if err != nil {
|
|
er := fmt.Errorf("error: methodREQToFileAppend.handler: failed to open file : %v, message: %v", err, message)
|
|
sendErrorLogMessage(proc.configuration, proc.processes.metrics, proc.toRingbufferCh, proc.node, er)
|
|
log.Printf("%v\n", er)
|
|
return nil, err
|
|
}
|
|
defer f.Close()
|
|
|
|
for _, d := range message.Data {
|
|
_, err := f.Write([]byte(d))
|
|
f.Sync()
|
|
if err != nil {
|
|
er := fmt.Errorf("error: methodEventTextLogging.handler: failed to write to file : %v, message: %v", err, message)
|
|
sendErrorLogMessage(proc.configuration, proc.processes.metrics, proc.toRingbufferCh, proc.node, er)
|
|
log.Printf("%v\n", er)
|
|
}
|
|
}
|
|
|
|
ackMsg := []byte("confirmed from: " + node + ": " + fmt.Sprint(message.ID))
|
|
return ackMsg, nil
|
|
}
|
|
|
|
// -----
|
|
|
|
type methodREQToFile struct {
|
|
commandOrEvent CommandOrEvent
|
|
}
|
|
|
|
func (m methodREQToFile) getKind() CommandOrEvent {
|
|
return m.commandOrEvent
|
|
}
|
|
|
|
// Handle writing to a file. Will truncate any existing data if the file did already
|
|
// exist.
|
|
func (m methodREQToFile) handler(proc process, message Message, node string) ([]byte, error) {
|
|
|
|
// 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.
|
|
fileName, folderTree := selectFileNaming(message, proc)
|
|
|
|
// 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 {
|
|
er := fmt.Errorf("error: methodREQToFile failed to create toFile directory tree %v: %v, %v", folderTree, err, message)
|
|
sendErrorLogMessage(proc.configuration, proc.processes.metrics, proc.toRingbufferCh, proc.node, er)
|
|
log.Printf("%v\n", er)
|
|
|
|
return nil, er
|
|
}
|
|
|
|
log.Printf("info: Creating subscribers data folder at %v\n", folderTree)
|
|
}
|
|
|
|
// Open file and write data.
|
|
file := filepath.Join(folderTree, fileName)
|
|
f, err := os.OpenFile(file, os.O_CREATE|os.O_RDWR|os.O_TRUNC, 0755)
|
|
if err != nil {
|
|
er := fmt.Errorf("error: methodREQToFile.handler: failed to open file, check that you've specified a value for fileName in the message: %v", err)
|
|
sendErrorLogMessage(proc.configuration, proc.processes.metrics, proc.toRingbufferCh, proc.node, er)
|
|
log.Printf("%v\n", er)
|
|
return nil, err
|
|
}
|
|
defer f.Close()
|
|
|
|
for _, d := range message.Data {
|
|
_, err := f.Write([]byte(d))
|
|
f.Sync()
|
|
if err != nil {
|
|
er := fmt.Errorf("error: methodEventTextLogging.handler: failed to write to file: %v, %v", err, message)
|
|
sendErrorLogMessage(proc.configuration, proc.processes.metrics, proc.toRingbufferCh, proc.node, er)
|
|
log.Printf("%v\n", er)
|
|
}
|
|
}
|
|
|
|
ackMsg := []byte("confirmed from: " + node + ": " + fmt.Sprint(message.ID))
|
|
return ackMsg, nil
|
|
}
|
|
|
|
// ----
|
|
type methodREQHello struct {
|
|
commandOrEvent CommandOrEvent
|
|
}
|
|
|
|
func (m methodREQHello) getKind() CommandOrEvent {
|
|
return m.commandOrEvent
|
|
}
|
|
|
|
// Handler for receiving hello messages.
|
|
func (m methodREQHello) handler(proc process, message Message, node string) ([]byte, error) {
|
|
data := fmt.Sprintf("%v, Received hello from %#v\n", time.Now().Format("Mon Jan _2 15:04:05 2006"), message.FromNode)
|
|
|
|
fileName := message.FileName
|
|
folderTree := filepath.Join(proc.configuration.SubscribersDataFolder, message.Directory, string(message.FromNode))
|
|
|
|
// 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)
|
|
}
|
|
|
|
log.Printf("info: Creating subscribers data folder at %v\n", folderTree)
|
|
}
|
|
|
|
// Open file and write data.
|
|
file := filepath.Join(folderTree, fileName)
|
|
f, err := os.OpenFile(file, os.O_APPEND|os.O_RDWR|os.O_CREATE|os.O_SYNC, 0600)
|
|
|
|
if err != nil {
|
|
log.Printf("error: methodREQHello.handler: failed to open file: %v\n", err)
|
|
return nil, err
|
|
}
|
|
defer f.Close()
|
|
|
|
_, err = f.Write([]byte(data))
|
|
f.Sync()
|
|
if err != nil {
|
|
log.Printf("error: methodEventTextLogging.handler: failed to write to file: %v\n", err)
|
|
}
|
|
|
|
// --------------------------
|
|
|
|
// 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
|
|
|
|
ackMsg := []byte("confirmed from: " + node + ": " + fmt.Sprint(message.ID))
|
|
return ackMsg, nil
|
|
}
|
|
|
|
// ---
|
|
|
|
type methodREQErrorLog struct {
|
|
commandOrEvent CommandOrEvent
|
|
}
|
|
|
|
func (m methodREQErrorLog) getKind() CommandOrEvent {
|
|
return m.commandOrEvent
|
|
}
|
|
|
|
// Handle the writing of error logs.
|
|
func (m methodREQErrorLog) handler(proc process, message Message, node string) ([]byte, error) {
|
|
proc.processes.metrics.promErrorMessagesReceivedTotal.Inc()
|
|
|
|
// 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.
|
|
fileName, folderTree := selectFileNaming(message, proc)
|
|
|
|
// 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)
|
|
}
|
|
|
|
log.Printf("info: Creating subscribers data folder at %v\n", folderTree)
|
|
}
|
|
|
|
// Open file and write data.
|
|
file := filepath.Join(folderTree, fileName)
|
|
f, err := os.OpenFile(file, os.O_APPEND|os.O_RDWR|os.O_CREATE|os.O_SYNC, 0600)
|
|
if err != nil {
|
|
log.Printf("error: methodREQErrorLog.handler: failed to open file: %v\n", err)
|
|
return nil, err
|
|
}
|
|
defer f.Close()
|
|
|
|
for _, d := range message.Data {
|
|
_, err := f.Write([]byte(d))
|
|
f.Sync()
|
|
if err != nil {
|
|
log.Printf("error: methodEventTextLogging.handler: failed to write to file: %v\n", err)
|
|
}
|
|
}
|
|
|
|
ackMsg := []byte("confirmed from: " + node + ": " + fmt.Sprint(message.ID))
|
|
return ackMsg, nil
|
|
}
|
|
|
|
// ---
|
|
|
|
type methodREQPing struct {
|
|
commandOrEvent CommandOrEvent
|
|
}
|
|
|
|
func (m methodREQPing) getKind() CommandOrEvent {
|
|
return m.commandOrEvent
|
|
}
|
|
|
|
// Handle receving a ping.
|
|
func (m methodREQPing) handler(proc process, message Message, node string) ([]byte, error) {
|
|
// Write to file that we received a ping
|
|
|
|
// 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.
|
|
fileName, folderTree := selectFileNaming(message, proc)
|
|
|
|
// 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 {
|
|
er := fmt.Errorf("error: methodREQPing.handler: failed to create toFile directory tree %v: %v, %v", folderTree, err, message)
|
|
sendErrorLogMessage(proc.configuration, proc.processes.metrics, proc.toRingbufferCh, proc.node, er)
|
|
log.Printf("%v\n", er)
|
|
|
|
return nil, er
|
|
}
|
|
|
|
log.Printf("info: Creating subscribers data folder at %v\n", folderTree)
|
|
}
|
|
|
|
// 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 {
|
|
er := fmt.Errorf("error: methodREQPing.handler: failed to open file, check that you've specified a value for fileName in the message: %v", err)
|
|
sendErrorLogMessage(proc.configuration, proc.processes.metrics, proc.toRingbufferCh, proc.node, er)
|
|
log.Printf("%v\n", er)
|
|
return nil, err
|
|
}
|
|
defer f.Close()
|
|
|
|
// And write the data
|
|
d := fmt.Sprintf("%v, ping received from %v\n", time.Now().Format("Mon Jan _2 15:04:05 2006"), message.FromNode)
|
|
_, err = f.Write([]byte(d))
|
|
f.Sync()
|
|
if err != nil {
|
|
er := fmt.Errorf("error: methodREQPing.handler: failed to write to file: %v, %v", err, message)
|
|
sendErrorLogMessage(proc.configuration, proc.processes.metrics, proc.toRingbufferCh, proc.node, er)
|
|
log.Printf("%v\n", er)
|
|
}
|
|
|
|
proc.processes.wg.Add(1)
|
|
go func() {
|
|
defer proc.processes.wg.Done()
|
|
|
|
newReplyMessage(proc, message, nil)
|
|
}()
|
|
|
|
ackMsg := []byte("confirmed from: " + node + ": " + fmt.Sprint(message.ID))
|
|
return ackMsg, nil
|
|
}
|
|
|
|
// ---
|
|
|
|
type methodREQPong struct {
|
|
commandOrEvent CommandOrEvent
|
|
}
|
|
|
|
func (m methodREQPong) getKind() CommandOrEvent {
|
|
return m.commandOrEvent
|
|
}
|
|
|
|
// Handle receiving a pong.
|
|
func (m methodREQPong) handler(proc process, message Message, node string) ([]byte, error) {
|
|
// 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.
|
|
fileName, folderTree := selectFileNaming(message, proc)
|
|
|
|
// 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 {
|
|
er := fmt.Errorf("error: methodREQPong.handler: failed to create toFile directory tree %v: %v, %v", folderTree, err, message)
|
|
sendErrorLogMessage(proc.configuration, proc.processes.metrics, proc.toRingbufferCh, proc.node, er)
|
|
log.Printf("%v\n", er)
|
|
|
|
return nil, er
|
|
}
|
|
|
|
log.Printf("info: Creating subscribers data folder at %v\n", folderTree)
|
|
}
|
|
|
|
// 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 {
|
|
er := fmt.Errorf("error: methodREQPong.handler: failed to open file, check that you've specified a value for fileName in the message: %v", err)
|
|
sendErrorLogMessage(proc.configuration, proc.processes.metrics, proc.toRingbufferCh, proc.node, er)
|
|
log.Printf("%v\n", er)
|
|
return nil, err
|
|
}
|
|
defer f.Close()
|
|
|
|
// And write the data
|
|
d := fmt.Sprintf("%v, pong received from %v\n", time.Now().Format("Mon Jan _2 15:04:05 2006"), message.PreviousMessage.ToNode)
|
|
_, err = f.Write([]byte(d))
|
|
f.Sync()
|
|
if err != nil {
|
|
er := fmt.Errorf("error: methodREQPong.handler: failed to write to file: %v, %v", err, message)
|
|
sendErrorLogMessage(proc.configuration, proc.processes.metrics, proc.toRingbufferCh, proc.node, er)
|
|
log.Printf("%v\n", er)
|
|
}
|
|
|
|
ackMsg := []byte("confirmed from: " + node + ": " + fmt.Sprint(message.ID))
|
|
return ackMsg, nil
|
|
}
|
|
|
|
// ---
|
|
|
|
type methodREQCliCommand struct {
|
|
commandOrEvent CommandOrEvent
|
|
}
|
|
|
|
func (m methodREQCliCommand) getKind() CommandOrEvent {
|
|
return m.commandOrEvent
|
|
}
|
|
|
|
// 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.
|
|
func (m methodREQCliCommand) handler(proc process, message Message, node string) ([]byte, error) {
|
|
log.Printf("<--- CLICommandREQUEST received from: %v, containing: %v", message.FromNode, message.Data)
|
|
|
|
// 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.
|
|
proc.processes.wg.Add(1)
|
|
go func() {
|
|
defer proc.processes.wg.Done()
|
|
|
|
c := message.MethodArgs[0]
|
|
a := message.MethodArgs[1:]
|
|
|
|
ctx, cancel := context.WithTimeout(proc.ctx, time.Second*time.Duration(message.MethodTimeout))
|
|
|
|
outCh := make(chan []byte)
|
|
|
|
proc.processes.wg.Add(1)
|
|
go func() {
|
|
defer proc.processes.wg.Done()
|
|
|
|
cmd := exec.CommandContext(ctx, c, a...)
|
|
|
|
var out bytes.Buffer
|
|
var stderr bytes.Buffer
|
|
cmd.Stdout = &out
|
|
cmd.Stderr = &stderr
|
|
err := cmd.Run()
|
|
if err != nil {
|
|
if err != nil {
|
|
log.Printf("error: failed to io.ReadAll of stderr: %v\n", err)
|
|
}
|
|
|
|
er := fmt.Errorf("error: methodREQCliCommand: cmd.Output : %v, message: %v, error_output: %v", err, message, stderr.String())
|
|
sendErrorLogMessage(proc.configuration, proc.processes.metrics, proc.toRingbufferCh, proc.node, er)
|
|
log.Printf("%v\n", er)
|
|
}
|
|
select {
|
|
case outCh <- out.Bytes():
|
|
case <-ctx.Done():
|
|
return
|
|
}
|
|
}()
|
|
|
|
select {
|
|
case <-ctx.Done():
|
|
cancel()
|
|
er := fmt.Errorf("error: methodREQCliCommand: method timed out %v", message)
|
|
sendErrorLogMessage(proc.configuration, proc.processes.metrics, proc.toRingbufferCh, proc.node, er)
|
|
case out := <-outCh:
|
|
cancel()
|
|
|
|
// 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
|
|
}
|
|
|
|
// ---
|
|
|
|
type methodREQToConsole struct {
|
|
commandOrEvent CommandOrEvent
|
|
}
|
|
|
|
func (m methodREQToConsole) getKind() CommandOrEvent {
|
|
return m.commandOrEvent
|
|
}
|
|
|
|
// Handler to write directly to console.
|
|
func (m methodREQToConsole) handler(proc process, message Message, node string) ([]byte, error) {
|
|
fmt.Printf("<--- methodCLICommandReply: %v\n", message.Data)
|
|
|
|
ackMsg := []byte("confirmed from: " + node + ": " + fmt.Sprint(message.ID))
|
|
return ackMsg, nil
|
|
}
|
|
|
|
// ---
|
|
|
|
type methodREQHttpGet struct {
|
|
commandOrEvent CommandOrEvent
|
|
}
|
|
|
|
func (m methodREQHttpGet) getKind() CommandOrEvent {
|
|
return m.commandOrEvent
|
|
}
|
|
|
|
// handler to do a Http Get.
|
|
func (m methodREQHttpGet) handler(proc process, message Message, node string) ([]byte, error) {
|
|
log.Printf("<--- REQHttpGet received from: %v, containing: %v", message.FromNode, message.Data)
|
|
|
|
proc.processes.wg.Add(1)
|
|
go func() {
|
|
defer proc.processes.wg.Done()
|
|
|
|
url := message.MethodArgs[0]
|
|
|
|
client := http.Client{
|
|
Timeout: time.Second * 5,
|
|
}
|
|
|
|
ctx, cancel := context.WithTimeout(proc.ctx, time.Second*time.Duration(message.MethodTimeout))
|
|
|
|
req, err := http.NewRequestWithContext(ctx, http.MethodGet, url, nil)
|
|
if err != nil {
|
|
er := fmt.Errorf("error: methodREQHttpGet: NewRequest failed: %v, bailing out: %v", err, message)
|
|
sendErrorLogMessage(proc.configuration, proc.processes.metrics, proc.toRingbufferCh, proc.node, er)
|
|
cancel()
|
|
return
|
|
}
|
|
|
|
outCh := make(chan []byte)
|
|
|
|
proc.processes.wg.Add(1)
|
|
go func() {
|
|
defer proc.processes.wg.Done()
|
|
|
|
resp, err := client.Do(req)
|
|
if err != nil {
|
|
er := fmt.Errorf("error: methodREQHttpGet: client.Do failed: %v, bailing out: %v", err, message)
|
|
sendErrorLogMessage(proc.configuration, proc.processes.metrics, proc.toRingbufferCh, proc.node, er)
|
|
return
|
|
}
|
|
defer resp.Body.Close()
|
|
|
|
if resp.StatusCode != 200 {
|
|
cancel()
|
|
er := fmt.Errorf("error: methodREQHttpGet: not 200, where %#v, bailing out: %v", resp.StatusCode, message)
|
|
sendErrorLogMessage(proc.configuration, proc.processes.metrics, proc.toRingbufferCh, proc.node, er)
|
|
return
|
|
}
|
|
|
|
body, err := io.ReadAll(resp.Body)
|
|
if err != nil {
|
|
er := fmt.Errorf("error: methodREQHttpGet: io.ReadAll failed : %v, message: %v", err, message)
|
|
sendErrorLogMessage(proc.configuration, proc.processes.metrics, proc.toRingbufferCh, proc.node, er)
|
|
log.Printf("%v\n", er)
|
|
}
|
|
|
|
out := body
|
|
|
|
select {
|
|
case outCh <- out:
|
|
case <-ctx.Done():
|
|
return
|
|
}
|
|
}()
|
|
|
|
select {
|
|
case <-ctx.Done():
|
|
cancel()
|
|
er := fmt.Errorf("error: methodREQHttpGet: method timed out %v", message)
|
|
sendErrorLogMessage(proc.configuration, proc.processes.metrics, proc.toRingbufferCh, proc.node, er)
|
|
case out := <-outCh:
|
|
cancel()
|
|
|
|
// 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
|
|
}
|
|
|
|
// --- methodREQTailFile
|
|
|
|
type methodREQTailFile struct {
|
|
commandOrEvent CommandOrEvent
|
|
}
|
|
|
|
func (m methodREQTailFile) getKind() CommandOrEvent {
|
|
return m.commandOrEvent
|
|
}
|
|
|
|
// 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) {
|
|
log.Printf("<--- TailFile REQUEST received from: %v, containing: %v", message.FromNode, message.Data)
|
|
|
|
proc.processes.wg.Add(1)
|
|
go func() {
|
|
defer proc.processes.wg.Done()
|
|
|
|
fp := message.MethodArgs[0]
|
|
|
|
var ctx context.Context
|
|
var cancel context.CancelFunc
|
|
|
|
if message.MethodTimeout != 0 {
|
|
ctx, cancel = context.WithTimeout(proc.ctx, time.Second*time.Duration(message.MethodTimeout))
|
|
} else {
|
|
ctx, cancel = context.WithCancel(proc.ctx)
|
|
}
|
|
|
|
outCh := make(chan []byte)
|
|
t, err := tail.TailFile(fp, tail.Config{Follow: true, Location: &tail.SeekInfo{
|
|
Offset: 0,
|
|
Whence: os.SEEK_END,
|
|
}})
|
|
if err != nil {
|
|
er := fmt.Errorf("error: methodREQToTailFile: tailFile: %v", err)
|
|
log.Printf("%v\n", er)
|
|
sendErrorLogMessage(proc.configuration, proc.processes.metrics, proc.toRingbufferCh, proc.node, er)
|
|
}
|
|
|
|
proc.processes.wg.Add(1)
|
|
go func() {
|
|
defer proc.processes.wg.Done()
|
|
|
|
for {
|
|
select {
|
|
case line := <-t.Lines:
|
|
outCh <- []byte(line.Text + "\n")
|
|
case <-ctx.Done():
|
|
return
|
|
}
|
|
|
|
}
|
|
}()
|
|
|
|
for {
|
|
select {
|
|
case <-ctx.Done():
|
|
cancel()
|
|
// Close the lines channel so we exit the reading lines
|
|
// go routine.
|
|
// close(t.Lines)
|
|
er := fmt.Errorf("info: method timeout reached, canceling: %v", message)
|
|
sendErrorLogMessage(proc.configuration, proc.processes.metrics, proc.toRingbufferCh, proc.node, er)
|
|
|
|
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
|
|
}
|
|
|
|
// ---
|
|
type methodREQCliCommandCont struct {
|
|
commandOrEvent CommandOrEvent
|
|
}
|
|
|
|
func (m methodREQCliCommandCont) getKind() CommandOrEvent {
|
|
return m.commandOrEvent
|
|
}
|
|
|
|
// Handler to run REQCliCommandCont, which is the same as normal
|
|
// 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.
|
|
func (m methodREQCliCommandCont) handler(proc process, message Message, node string) ([]byte, error) {
|
|
log.Printf("<--- CLInCommandCont REQUEST received from: %v, containing: %v", message.FromNode, message.Data)
|
|
|
|
// 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.
|
|
proc.processes.wg.Add(1)
|
|
go func() {
|
|
defer proc.processes.wg.Done()
|
|
|
|
c := message.MethodArgs[0]
|
|
a := message.MethodArgs[1:]
|
|
|
|
ctx, cancel := context.WithTimeout(proc.ctx, time.Second*time.Duration(message.MethodTimeout))
|
|
|
|
outCh := make(chan []byte)
|
|
|
|
proc.processes.wg.Add(1)
|
|
go func() {
|
|
proc.processes.wg.Done()
|
|
|
|
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 {
|
|
er := fmt.Errorf("error: methodREQCliCommandCont: cmd.StdoutPipe failed : %v, message: %v", err, message)
|
|
sendErrorLogMessage(proc.configuration, proc.processes.metrics, proc.toRingbufferCh, proc.node, er)
|
|
log.Printf("%v\n", er)
|
|
|
|
log.Printf("error: %v\n", err)
|
|
}
|
|
|
|
ErrorReader, err := cmd.StderrPipe()
|
|
if err != nil {
|
|
er := fmt.Errorf("error: methodREQCliCommandCont: cmd.StderrPipe failed : %v, message: %v", err, message)
|
|
sendErrorLogMessage(proc.configuration, proc.processes.metrics, proc.toRingbufferCh, proc.node, er)
|
|
log.Printf("%v\n", er)
|
|
|
|
log.Printf("error: %v\n", err)
|
|
}
|
|
|
|
if err := cmd.Start(); err != nil {
|
|
er := fmt.Errorf("error: methodREQCliCommandCont: cmd.Start failed : %v, message: %v", err, message)
|
|
sendErrorLogMessage(proc.configuration, proc.processes.metrics, proc.toRingbufferCh, proc.node, er)
|
|
log.Printf("%v\n", er)
|
|
|
|
}
|
|
|
|
// Also send error messages that might happen during the time
|
|
// cmd.Start runs.
|
|
// Putting the scanner.Text value on a channel so we can make
|
|
// the scanner non-blocking, and also check context cancelation.
|
|
go func() {
|
|
errCh := make(chan string, 1)
|
|
|
|
scanner := bufio.NewScanner(ErrorReader)
|
|
for scanner.Scan() {
|
|
select {
|
|
case errCh <- scanner.Text():
|
|
er := fmt.Errorf("error: methodREQCliCommandCont: cmd.Start failed : %v, message: %v, error_output: %v", err, message, <-errCh)
|
|
sendErrorLogMessage(proc.configuration, proc.processes.metrics, proc.toRingbufferCh, proc.node, er)
|
|
log.Printf("%v\n", er)
|
|
case <-ctx.Done():
|
|
return
|
|
}
|
|
}
|
|
}()
|
|
|
|
scanner := bufio.NewScanner(outReader)
|
|
for scanner.Scan() {
|
|
select {
|
|
case outCh <- []byte(scanner.Text() + "\n"):
|
|
case <-ctx.Done():
|
|
return
|
|
}
|
|
|
|
}
|
|
|
|
}()
|
|
|
|
// Check if context timer or command output were received.
|
|
for {
|
|
select {
|
|
case <-ctx.Done():
|
|
cancel()
|
|
er := fmt.Errorf("info: methodREQCliCommandCont: method timeout reached, canceling: %v", message)
|
|
sendErrorLogMessage(proc.configuration, proc.processes.metrics, proc.toRingbufferCh, proc.node, er)
|
|
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
|
|
}
|
|
|
|
// ---
|
|
|
|
type methodREQToSocket struct {
|
|
commandOrEvent CommandOrEvent
|
|
}
|
|
|
|
func (m methodREQToSocket) getKind() CommandOrEvent {
|
|
return m.commandOrEvent
|
|
}
|
|
|
|
// TODO:
|
|
// Handler to write to unix socket file.
|
|
func (m methodREQToSocket) handler(proc process, message Message, node string) ([]byte, error) {
|
|
|
|
for _, d := range message.Data {
|
|
// Write the data to the socket here.
|
|
fmt.Printf("Info: Data to write to socket: %v\n", d)
|
|
}
|
|
|
|
ackMsg := []byte("confirmed from: " + node + ": " + fmt.Sprint(message.ID))
|
|
return ackMsg, nil
|
|
}
|
|
|
|
// ----
|