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ctrl/requests.go

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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.
//
// ---
// type methodCommandCLICommandRequest struct {
// commandOrEvent CommandOrEvent
// }
//
// func (m methodCommandCLICommandRequest) getKind() CommandOrEvent {
// return m.commandOrEvent
// }
//
// func (m methodCommandCLICommandRequest) handler(s *server, message Message, node string) ([]byte, error) {
// ...
// ...
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// ackMsg := []byte(fmt.Sprintf("confirmed from node: %v: messageID: %v\n---\n%s---", node, message.ID, out))
// return ackMsg, nil
// }
//
// ---
// You also need to make a constant for the Method, and add
// that constant as the key in the MethodsAvailable 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.
//
// Requests used in sub processes should always start with the
// naming REQSUB. Since the method of a sub process are defined
// within the method handler of the owning reqest type we should
// use the methodSUB for these types. The methodSUB handler
// does nothing.
//
// Check out the existing code below for more examples.
package ctrl
import (
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"context"
"fmt"
"path/filepath"
"strings"
"time"
)
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// Method is used to specify the actual function/method that
// is represented in a typed manner.
type Method string
// ------------------------------------------------------------
// 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.
Initial Method = "initial"
// Get a list of all the running processes.
OpProcessList Method = "opProcessList"
// Start up a process.
OpProcessStart Method = "opProcessStart"
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// Stop up a process.
OpProcessStop Method = "opProcessStop"
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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.
CliCommand Method = "cliCommand"
// 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
// generated, and not wait until the command is finished.
CliCommandCont Method = "cliCommandCont"
// 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.
Console Method = "console"
// 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.
FileAppend Method = "fileAppend"
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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.
File Method = "file"
// Initiated by the user.
CopySrc Method = "copySrc"
// Initial request for file copying.
// Generated by the source to send initial information to the destination.
CopyDst Method = "copyDst"
// Read the source file to be copied to some node.
SUBCopySrc Method = "subCopySrc"
// Write the destination copied to some node.
SUBCopyDst Method = "subCopyDst"
// Hello I'm here message.
Hello Method = "hello"
HelloPublisher Method = "helloPublisher"
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// Error log methods to centralError node.
ErrorLog Method = "errorLog"
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// Http Get
HttpGet Method = "httpGet"
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// Http Get Scheduled
// The second element of the MethodArgs slice holds the timer defined in seconds.
HttpGetScheduled Method = "httpGetScheduled"
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// Tail file
TailFile Method = "tailFile"
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// REQNone is used when there should be no reply.
None Method = "none"
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// REQTest is used only for testing to be able to grab the output
// of messages.
Test Method = "test"
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// REQPublicKey will get the public ed25519 key from a node.
PublicKey Method = "publicKey"
// REQKeysRequestUpdate will get all the public keys from central if an update is available.
KeysRequestUpdate Method = "keysRequestUpdate"
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// REQKeysDeliverUpdate will deliver the public from central to a node.
KeysDeliverUpdate Method = "keysDeliverUpdate"
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// REQKeysAllow
KeysAllow Method = "keysAllow"
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// REQKeysDelete
KeysDelete Method = "keysDelete"
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// REQAclRequestUpdate will get all node acl's from central if an update is available.
AclRequestUpdate Method = "aclRequestUpdate"
// REQAclDeliverUpdate will deliver the acl from central to a node.
AclDeliverUpdate Method = "aclDeliverUpdate"
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// REQAclAddCommand
AclAddCommand = "aclAddCommand"
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// REQAclDeleteCommand
AclDeleteCommand = "aclDeleteCommand"
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// REQAclDeleteSource
AclDeleteSource = "aclDeleteSource"
// REQGroupNodesAddNode
AclGroupNodesAddNode = "aclGroupNodesAddNode"
// REQAclGroupNodesDeleteNode
AclGroupNodesDeleteNode = "aclGroupNodesDeleteNode"
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// REQAclGroupNodesDeleteGroup
AclGroupNodesDeleteGroup = "aclGroupNodesDeleteGroup"
// REQAclGroupCommandsAddCommand
AclGroupCommandsAddCommand = "aclGroupCommandsAddCommand"
// REQAclGroupCommandsDeleteCommand
AclGroupCommandsDeleteCommand = "aclGroupCommandsDeleteCommand"
// REQAclGroupCommandsDeleteGroup
AclGroupCommandsDeleteGroup = "aclGroupCommandsDeleteGroup"
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// REQAclExport
AclExport = "aclExport"
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// REQAclImport
AclImport = "aclImport"
)
type HandlerFunc func(proc process, message Message, node string) ([]byte, error)
// The mapping of all the method constants specified, what type
// it references.
// The primary use of this table is that messages are not able to
// pass the actual type of the request since it is sent as a string,
// so we use the below table to find the actual type based on that
// string type.
func (m Method) GetMethodsAvailable() MethodsAvailable {
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ma := MethodsAvailable{
Methodhandlers: map[Method]HandlerFunc{
Initial: HandlerFunc(methodInitial),
OpProcessList: HandlerFunc(methodOpProcessList),
OpProcessStart: HandlerFunc(methodOpProcessStart),
OpProcessStop: HandlerFunc(methodOpProcessStop),
CliCommand: HandlerFunc(methodCliCommand),
CliCommandCont: HandlerFunc(methodCliCommandCont),
Console: HandlerFunc(methodConsole),
FileAppend: HandlerFunc(methodFileAppend),
File: HandlerFunc(methodToFile),
CopySrc: HandlerFunc(methodCopySrc),
CopyDst: HandlerFunc(methodCopyDst),
SUBCopySrc: HandlerFunc(methodSUB),
SUBCopyDst: HandlerFunc(methodSUB),
Hello: HandlerFunc(methodHello),
HelloPublisher: HandlerFunc(nil),
ErrorLog: HandlerFunc(methodErrorLog),
HttpGet: HandlerFunc(methodHttpGet),
HttpGetScheduled: HandlerFunc(methodHttpGetScheduled),
TailFile: HandlerFunc(methodTailFile),
PublicKey: HandlerFunc(methodPublicKey),
KeysRequestUpdate: HandlerFunc(methodKeysRequestUpdate),
KeysDeliverUpdate: HandlerFunc(methodKeysDeliverUpdate),
KeysAllow: HandlerFunc(methodKeysAllow),
KeysDelete: HandlerFunc(methodKeysDelete),
AclRequestUpdate: HandlerFunc(methodAclRequestUpdate),
AclDeliverUpdate: HandlerFunc(methodAclDeliverUpdate),
AclAddCommand: HandlerFunc(methodAclAddCommand),
AclDeleteCommand: HandlerFunc(methodAclDeleteCommand),
AclDeleteSource: HandlerFunc(methodAclDeleteSource),
AclGroupNodesAddNode: HandlerFunc(methodAclGroupNodesAddNode),
AclGroupNodesDeleteNode: HandlerFunc(methodAclGroupNodesDeleteNode),
AclGroupNodesDeleteGroup: HandlerFunc(methodAclGroupNodesDeleteGroup),
AclGroupCommandsAddCommand: HandlerFunc(methodAclGroupCommandsAddCommand),
AclGroupCommandsDeleteCommand: HandlerFunc(methodAclGroupCommandsDeleteCommand),
AclGroupCommandsDeleteGroup: HandlerFunc(methodAclGroupCommandsDeleteGroup),
AclExport: HandlerFunc(methodAclExport),
AclImport: HandlerFunc(methodAclImport),
Test: HandlerFunc(methodTest),
},
}
return ma
}
// getHandler will check the methodsAvailable map, and return the
// method handler for the method given
// as input argument.
func (m Method) getHandler(method Method) HandlerFunc {
ma := m.GetMethodsAvailable()
mh, _ := ma.CheckIfExists(method)
// mh := ma.Methodhandlers[method]
return mh
}
// 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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// Initial parent method used to start other processes.
func methodInitial(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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// place holder method used for sub processes.
// Methods used in sub processes are defined within the the requests
// they are spawned in, so this type is primarily for us to use the
// same logic with sub process requests as we do with normal requests.
func methodSUB(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.
type MethodsAvailable struct {
Methodhandlers map[Method]HandlerFunc
}
// 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) (HandlerFunc, bool) {
// First check if it is a sub process.
if strings.HasPrefix(string(m), "sub") {
// Strip of the uuid after the method name.
sp := strings.Split(string(m), ".")
m = Method(sp[0])
}
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mFunc, ok := ma.Methodhandlers[m]
if ok {
return mFunc, true
} else {
return nil, false
}
}
// 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.
//
// 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 == None || message.IsReply {
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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 = FileAppend
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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.
newMsg := Message{
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ToNode: message.FromNode,
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// The ToNodes field is not needed since it is only a concept that exists when messages
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// are injected f.ex. on a socket, and there they are directly converted into separate
// node messages. With other words a message in the system are only for single nodes,
// so we don't have to worry about the ToNodes field when creating reply messages.
FromNode: message.ToNode,
Data: outData,
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Method: message.ReplyMethod,
MethodArgs: message.ReplyMethodArgs,
MethodTimeout: message.ReplyMethodTimeout,
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IsReply: true,
RetryWait: message.RetryWait,
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ACKTimeout: message.ReplyACKTimeout,
Retries: message.ReplyRetries,
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.
PreviousMessage: &thisMsg,
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}
proc.newMessagesCh <- newMsg
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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
// As default we set the folder tree to what is specified in the
// message.Directory field. If we don't want that in the checks
// done later we then replace the value with what we want.
folderTree := message.Directory
checkPrefix := func(s string) bool {
if strings.HasPrefix(s, "./") || strings.HasPrefix(s, "/") {
return true
}
return false
}
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
if !checkPrefix(message.Directory) {
folderTree = filepath.Join(proc.configuration.SubscribersDataFolder, message.Directory, string(message.ToNode))
}
case message.PreviousMessage.ToNode != "":
fileName = message.PreviousMessage.FileName
if !checkPrefix(message.PreviousMessage.Directory) {
folderTree = filepath.Join(proc.configuration.SubscribersDataFolder, message.PreviousMessage.Directory, string(message.PreviousMessage.ToNode))
}
case message.PreviousMessage.ToNode == "":
fileName = message.PreviousMessage.FileName
if !checkPrefix(message.PreviousMessage.Directory) {
folderTree = filepath.Join(proc.configuration.SubscribersDataFolder, message.PreviousMessage.Directory, string(message.FromNode))
}
}
return fileName, folderTree
}