2021-03-01 16:08:40 +00:00
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// 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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2021-04-04 05:33:18 +00:00
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// type methodCommandCLICommandRequest struct {
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2021-03-01 16:08:40 +00:00
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// commandOrEvent CommandOrEvent
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// }
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//
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2021-04-04 05:33:18 +00:00
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// func (m methodCommandCLICommandRequest) getKind() CommandOrEvent {
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2021-03-01 16:08:40 +00:00
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// return m.commandOrEvent
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// }
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//
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2021-04-04 05:33:18 +00:00
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// func (m methodCommandCLICommandRequest) handler(s *server, message Message, node string) ([]byte, error) {
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2021-03-01 16:08:40 +00:00
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// ...
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// ...
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2021-03-11 05:34:36 +00:00
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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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2021-03-01 16:08:40 +00:00
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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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2021-02-11 14:39:19 +00:00
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package steward
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import (
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2021-03-26 15:04:01 +00:00
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"context"
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2021-02-11 14:39:19 +00:00
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"fmt"
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2021-03-02 12:46:02 +00:00
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"path/filepath"
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2021-03-11 11:07:09 +00:00
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"time"
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2021-02-11 14:39:19 +00:00
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)
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2021-03-11 16:14:43 +00:00
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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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2021-02-11 14:39:19 +00:00
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// ------------------------------------------------------------
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2021-03-01 16:08:40 +00:00
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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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2021-08-16 11:01:12 +00:00
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// Initial parent method used to start other processes.
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2021-04-08 11:43:47 +00:00
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REQInitial Method = "REQInitial"
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2021-09-20 04:40:34 +00:00
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// Get a list of all the running processes.
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REQOpProcessList Method = "REQOpProcessList"
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// Start up a process.
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REQOpProcessStart Method = "REQOpProcessStart"
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2021-09-20 09:53:17 +00:00
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// Stop up a process.
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REQOpProcessStop Method = "REQOpProcessStop"
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2021-03-11 16:14:43 +00:00
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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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2021-04-04 09:19:17 +00:00
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REQCliCommand Method = "REQCliCommand"
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2021-09-17 08:17:10 +00:00
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// REQCliCommandCont same as normal Cli command, but can be used
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2021-06-08 18:52:45 +00:00
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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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2021-09-17 08:17:10 +00:00
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// generated, and not wait until the command is finished.
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REQCliCommandCont Method = "REQCliCommandCont"
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2021-04-05 06:17:04 +00:00
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// Send text to be logged to the console.
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2021-03-11 16:14:43 +00:00
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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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2021-04-13 15:22:25 +00:00
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REQToConsole Method = "REQToConsole"
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2022-01-12 06:42:41 +00:00
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// REQTuiToConsole
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REQTuiToConsole Method = "REQTuiToConsole"
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2021-04-05 06:17:04 +00:00
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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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2021-03-11 16:14:43 +00:00
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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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2021-04-13 13:54:04 +00:00
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REQToFileAppend Method = "REQToFileAppend"
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2021-04-06 12:05:47 +00:00
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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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2021-04-13 15:15:13 +00:00
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REQToFile Method = "REQToFile"
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2022-03-04 14:02:43 +00:00
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// REQToFileNACK same as REQToFile but NACK.
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REQToFileNACK Method = "REQToFileNACK"
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2021-11-17 12:02:48 +00:00
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// Read the source file to be copied to some node.
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REQCopyFileFrom Method = "REQCopyFileFrom"
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// Write the destination copied to some node.
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REQCopyFileTo Method = "REQCopyFileTo"
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2021-03-11 16:14:43 +00:00
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// Send Hello I'm here message.
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2021-04-06 03:46:07 +00:00
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REQHello Method = "REQHello"
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2021-03-11 16:14:43 +00:00
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// Error log methods to centralError node.
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2021-04-06 05:56:49 +00:00
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REQErrorLog Method = "REQErrorLog"
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2021-03-11 05:34:36 +00:00
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// Echo request will ask the subscriber for a
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2021-03-11 16:14:43 +00:00
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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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2021-04-06 04:08:26 +00:00
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REQPing Method = "REQPing"
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2021-03-11 11:07:09 +00:00
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// Will generate a reply for a ECHORequest
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2021-04-06 04:08:26 +00:00
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REQPong Method = "REQPong"
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2021-04-06 17:42:03 +00:00
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// Http Get
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REQHttpGet Method = "REQHttpGet"
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2022-02-11 06:27:51 +00:00
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// Http Get Scheduled
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// The second element of the MethodArgs slice holds the timer defined in seconds.
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REQHttpGetScheduled Method = "REQHttpGetScheduled"
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2021-04-13 09:28:52 +00:00
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// Tail file
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REQTailFile Method = "REQTailFile"
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2021-07-01 08:05:34 +00:00
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// Write to steward socket
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2021-11-10 05:22:03 +00:00
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REQRelay Method = "REQRelay"
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2021-11-19 08:35:53 +00:00
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// The method handler for the first step in a relay chain.
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REQRelayInitial Method = "REQRelayInitial"
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2022-01-05 07:47:06 +00:00
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// REQNone is used when there should be no reply.
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REQNone Method = "REQNone"
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2022-04-07 07:34:06 +00:00
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// REQPublicKey will get the public ed25519 key from a node.
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2022-02-08 10:49:32 +00:00
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REQPublicKey Method = "REQPublicKey"
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2022-04-07 07:34:06 +00:00
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// REQPublicKeysGet will get all the public keys from central.
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REQPublicKeysGet Method = "REQPublicKeysGet"
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2022-04-20 04:26:01 +00:00
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// REQPublicKeysToNode will put all the public received from central.
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REQPublicKeysToNode Method = "REQPublicKeysToNode"
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2022-04-20 16:33:52 +00:00
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// REQAuthPublicKeysAllow
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REQPublicKeysAllow Method = "REQPublicKeysAllow"
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2022-05-18 12:43:35 +00:00
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// REQAclAddCommand
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REQAclAddCommand = "REQAclAddCommand"
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// REQAclDeleteCommand
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REQAclDeleteCommand = "REQAclDeleteCommand"
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2021-03-01 16:08:40 +00:00
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)
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2021-02-11 14:39:19 +00:00
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2021-03-01 16:08:40 +00:00
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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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2022-01-27 13:25:24 +00:00
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// Allowed values for the Event field are:
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2021-03-01 16:08:40 +00:00
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// - EventACK
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// - EventNack
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2021-02-11 14:39:19 +00:00
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func (m Method) GetMethodsAvailable() MethodsAvailable {
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2021-04-03 05:14:39 +00:00
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2021-02-11 14:39:19 +00:00
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ma := MethodsAvailable{
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2021-06-29 06:21:42 +00:00
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Methodhandlers: map[Method]methodHandler{
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2021-04-08 11:43:47 +00:00
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REQInitial: methodREQInitial{
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2022-01-27 09:06:06 +00:00
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event: EventACK,
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2021-04-08 11:43:47 +00:00
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},
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2021-09-20 04:40:34 +00:00
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REQOpProcessList: methodREQOpProcessList{
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2022-01-27 09:06:06 +00:00
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event: EventACK,
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2021-09-20 04:40:34 +00:00
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},
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REQOpProcessStart: methodREQOpProcessStart{
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2022-01-27 09:06:06 +00:00
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event: EventACK,
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2021-09-20 04:40:34 +00:00
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},
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2021-09-20 09:53:17 +00:00
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REQOpProcessStop: methodREQOpProcessStop{
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2022-01-27 09:06:06 +00:00
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event: EventACK,
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2021-09-20 09:53:17 +00:00
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},
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2021-04-04 09:19:17 +00:00
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REQCliCommand: methodREQCliCommand{
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2022-01-27 09:06:06 +00:00
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event: EventACK,
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2021-03-11 11:07:09 +00:00
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},
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2021-09-17 08:17:10 +00:00
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REQCliCommandCont: methodREQCliCommandCont{
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2022-01-27 09:06:06 +00:00
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event: EventACK,
|
2021-06-08 18:52:45 +00:00
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},
|
2021-04-13 15:22:25 +00:00
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REQToConsole: methodREQToConsole{
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2022-01-27 09:06:06 +00:00
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event: EventACK,
|
2021-03-11 11:07:09 +00:00
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},
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2022-01-12 06:42:41 +00:00
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REQTuiToConsole: methodREQTuiToConsole{
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2022-01-27 09:06:06 +00:00
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event: EventACK,
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2022-01-12 06:42:41 +00:00
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},
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2021-04-13 13:54:04 +00:00
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REQToFileAppend: methodREQToFileAppend{
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2022-01-27 09:06:06 +00:00
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event: EventACK,
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2021-03-01 16:08:40 +00:00
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},
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2021-04-13 15:15:13 +00:00
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REQToFile: methodREQToFile{
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2022-01-27 09:06:06 +00:00
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event: EventACK,
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2021-04-06 12:05:47 +00:00
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},
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2022-03-04 14:02:43 +00:00
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REQToFileNACK: methodREQToFile{
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event: EventNACK,
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},
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2021-11-17 12:02:48 +00:00
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REQCopyFileFrom: methodREQCopyFileFrom{
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2022-01-27 09:06:06 +00:00
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event: EventACK,
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2021-11-17 12:02:48 +00:00
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},
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REQCopyFileTo: methodREQCopyFileTo{
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2022-01-27 09:06:06 +00:00
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event: EventACK,
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2021-11-17 12:02:48 +00:00
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},
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2021-04-06 03:46:07 +00:00
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REQHello: methodREQHello{
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2022-01-27 09:06:06 +00:00
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event: EventNACK,
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2021-03-01 16:08:40 +00:00
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},
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2021-04-06 05:56:49 +00:00
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REQErrorLog: methodREQErrorLog{
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2022-01-27 09:06:06 +00:00
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event: EventACK,
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2021-03-01 16:08:40 +00:00
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},
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2021-04-06 04:08:26 +00:00
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REQPing: methodREQPing{
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2022-01-27 09:06:06 +00:00
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event: EventACK,
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2021-03-11 05:34:36 +00:00
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},
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2021-04-06 04:08:26 +00:00
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REQPong: methodREQPong{
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2022-01-27 09:06:06 +00:00
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event: EventACK,
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2021-03-11 05:34:36 +00:00
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},
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2021-04-06 17:42:03 +00:00
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REQHttpGet: methodREQHttpGet{
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2022-01-27 09:06:06 +00:00
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event: EventACK,
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2021-04-06 17:42:03 +00:00
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},
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2022-02-11 06:27:51 +00:00
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REQHttpGetScheduled: methodREQHttpGetScheduled{
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event: EventACK,
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},
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2021-04-13 09:28:52 +00:00
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REQTailFile: methodREQTailFile{
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2022-01-27 09:06:06 +00:00
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event: EventACK,
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2021-04-13 09:28:52 +00:00
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},
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2021-11-10 05:22:03 +00:00
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REQRelay: methodREQRelay{
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2022-01-27 09:06:06 +00:00
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event: EventACK,
|
2021-11-10 05:22:03 +00:00
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},
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2021-11-19 08:35:53 +00:00
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REQRelayInitial: methodREQRelayInitial{
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2022-01-27 09:06:06 +00:00
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event: EventACK,
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2021-11-19 08:35:53 +00:00
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},
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2022-02-08 04:17:38 +00:00
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REQPublicKey: methodREQPublicKey{
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event: EventACK,
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},
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2022-04-07 07:34:06 +00:00
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REQPublicKeysGet: methodREQPublicKeysGet{
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event: EventNACK,
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},
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2022-04-20 04:26:01 +00:00
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REQPublicKeysToNode: methodREQPublicKeysToNode{
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2022-04-07 07:34:06 +00:00
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event: EventNACK,
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},
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2022-04-20 16:33:52 +00:00
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REQPublicKeysAllow: methodREQPublicKeysAllow{
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event: EventACK,
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},
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2022-05-18 12:43:35 +00:00
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REQAclAddCommand: methodREQAclAddCommand{
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event: EventACK,
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},
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REQAclDeleteCommand: methodREQAclDeleteCommand{
|
2022-05-18 09:26:06 +00:00
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event: EventACK,
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},
|
2021-02-11 14:39:19 +00:00
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},
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}
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return ma
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}
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|
2021-07-01 05:42:45 +00:00
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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.
|
2021-06-29 06:21:42 +00:00
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func (m Method) GetReplyMethods() []Method {
|
2022-04-20 04:41:45 +00:00
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rm := []Method{REQToConsole, REQTuiToConsole, REQCliCommand, REQCliCommandCont, REQToFile, REQToFileAppend, REQNone}
|
2021-06-16 19:38:33 +00:00
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return rm
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}
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|
2021-03-01 16:08:40 +00:00
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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()
|
2021-06-29 06:21:42 +00:00
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mh := ma.Methodhandlers[method]
|
2021-03-01 16:08:40 +00:00
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return mh
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}
|
2021-02-11 14:39:19 +00:00
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|
2022-01-26 14:35:31 +00:00
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|
// getContextForMethodTimeout, will return a context with cancel function
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|
// with the timeout set to the method timeout in the message.
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|
// If the value of timeout is set to -1, we don't want it to stop, so we
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|
// return a context with a timeout set to 200 years.
|
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|
func getContextForMethodTimeout(ctx context.Context, message Message) (context.Context, context.CancelFunc) {
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|
|
// If methodTimeout == -1, which means we don't want a timeout, set the
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|
// time out to 200 years.
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|
|
if message.MethodTimeout == -1 {
|
|
|
|
return context.WithTimeout(ctx, time.Hour*time.Duration(8760*200))
|
|
|
|
}
|
|
|
|
|
|
|
|
return context.WithTimeout(ctx, time.Second*time.Duration(message.MethodTimeout))
|
|
|
|
}
|
2021-04-08 11:43:47 +00:00
|
|
|
|
|
|
|
// ----
|
|
|
|
|
2021-08-16 11:01:12 +00:00
|
|
|
// Initial parent method used to start other processes.
|
2021-04-08 11:43:47 +00:00
|
|
|
type methodREQInitial struct {
|
2022-01-27 09:06:06 +00:00
|
|
|
event Event
|
2021-04-08 11:43:47 +00:00
|
|
|
}
|
|
|
|
|
2022-01-27 06:19:04 +00:00
|
|
|
func (m methodREQInitial) getKind() Event {
|
2022-01-27 09:06:06 +00:00
|
|
|
return m.event
|
2021-04-08 11:43:47 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
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
|
|
|
|
}
|
|
|
|
|
|
|
|
// ----
|
2021-08-16 11:01:12 +00:00
|
|
|
|
|
|
|
// MethodsAvailable holds a map of all the different method types and the
|
|
|
|
// associated handler to that method type.
|
2021-02-11 14:39:19 +00:00
|
|
|
type MethodsAvailable struct {
|
2021-06-29 06:21:42 +00:00
|
|
|
Methodhandlers map[Method]methodHandler
|
2021-02-11 14:39:19 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
// 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) {
|
2021-06-29 06:21:42 +00:00
|
|
|
mFunc, ok := ma.Methodhandlers[m]
|
2021-02-11 14:39:19 +00:00
|
|
|
if ok {
|
|
|
|
return mFunc, true
|
|
|
|
} else {
|
|
|
|
return nil, false
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
2021-11-22 03:24:15 +00:00
|
|
|
// 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
|
2021-08-16 11:01:12 +00:00
|
|
|
// 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.
|
2021-11-22 03:24:15 +00:00
|
|
|
//
|
|
|
|
// 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.
|
2021-08-16 11:01:12 +00:00
|
|
|
func newReplyMessage(proc process, message Message, outData []byte) {
|
2022-01-05 07:47:06 +00:00
|
|
|
// 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
|
|
|
|
}
|
2021-08-16 11:01:12 +00:00
|
|
|
|
|
|
|
// If no replyMethod is set we default to writing to writing to
|
|
|
|
// a log file.
|
|
|
|
if message.ReplyMethod == "" {
|
|
|
|
message.ReplyMethod = REQToFileAppend
|
|
|
|
}
|
|
|
|
|
2021-11-22 03:24:15 +00:00
|
|
|
// 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
|
|
|
|
|
2021-08-16 11:01:12 +00:00
|
|
|
// Create a new message for the reply, and put it on the
|
|
|
|
// ringbuffer to be published.
|
2022-04-07 07:34:06 +00:00
|
|
|
// TODO: Check that we still got all the fields present that are needed here.
|
2021-08-16 11:01:12 +00:00
|
|
|
newMsg := Message{
|
2021-09-16 10:37:46 +00:00
|
|
|
ToNode: message.FromNode,
|
2021-09-22 13:25:40 +00:00
|
|
|
FromNode: message.ToNode,
|
2022-01-31 07:49:46 +00:00
|
|
|
Data: outData,
|
2021-09-16 10:37:46 +00:00
|
|
|
Method: message.ReplyMethod,
|
|
|
|
MethodArgs: message.ReplyMethodArgs,
|
|
|
|
MethodTimeout: message.ReplyMethodTimeout,
|
2021-09-22 14:08:55 +00:00
|
|
|
IsReply: true,
|
2021-09-16 10:37:46 +00:00
|
|
|
ACKTimeout: message.ReplyACKTimeout,
|
|
|
|
Retries: message.ReplyRetries,
|
2021-09-22 13:25:40 +00:00
|
|
|
Directory: message.Directory,
|
|
|
|
FileName: message.FileName,
|
2021-08-16 11:01:12 +00:00
|
|
|
|
|
|
|
// 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.
|
2021-11-22 03:24:15 +00:00
|
|
|
PreviousMessage: &thisMsg,
|
2021-08-16 11:01:12 +00:00
|
|
|
}
|
|
|
|
|
2021-08-25 06:56:44 +00:00
|
|
|
sam, err := newSubjectAndMessage(newMsg)
|
2021-08-16 11:01:12 +00:00
|
|
|
if err != nil {
|
|
|
|
// In theory the system should drop the message before it reaches here.
|
2021-09-23 06:19:53 +00:00
|
|
|
er := fmt.Errorf("error: newSubjectAndMessage : %v, message: %v", err, message)
|
2022-04-01 06:43:14 +00:00
|
|
|
proc.errorKernel.errSend(proc, message, er)
|
2021-08-16 11:01:12 +00:00
|
|
|
}
|
2022-01-03 09:40:27 +00:00
|
|
|
|
2021-08-25 06:56:44 +00:00
|
|
|
proc.toRingbufferCh <- []subjectAndMessage{sam}
|
2021-08-16 11:01:12 +00:00
|
|
|
}
|
|
|
|
|
2021-09-07 04:24:21 +00:00
|
|
|
// 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
|
|
|
|
}
|
|
|
|
|
2021-02-18 13:27:53 +00:00
|
|
|
// ------------------------------------------------------------
|
|
|
|
// Subscriber method handlers
|
2021-02-11 14:39:19 +00:00
|
|
|
// ------------------------------------------------------------
|
|
|
|
|
2021-08-16 11:01:12 +00:00
|
|
|
// The methodHandler interface.
|
2021-02-11 14:39:19 +00:00
|
|
|
type methodHandler interface {
|
2021-03-08 13:09:14 +00:00
|
|
|
handler(proc process, message Message, node string) ([]byte, error)
|
2022-01-27 06:19:04 +00:00
|
|
|
getKind() Event
|
2021-02-11 14:39:19 +00:00
|
|
|
}
|