ipc

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Published: Apr 11, 2021 License: MIT Imports: 15 Imported by: 0

README

golang-ipc

Golang Inter-process communication library for Window, Mac and Linux.

Overview

A simple to use package that uses unix sockets on Macos/Linux and named pipes on Windows to create a communication channel between two go processes.

Usage

Create a server with the default configuation and start listening for the client:


	sc, err := ipc.StartServer("<name of socket or pipe>", nil)
	if err != nil {
		log.Println(err)
		return
	}

Create a client and connect to the server:


	cc, err := ipc.StartClient("<name of socket or pipe>", nil)
	if err != nil {
		log.Println(err)
		return
	}

Read and write data to the connection:

        // write data
        _ = sc.Write(1, []byte("Message from server"))
        
        _ = cc.Write(5, []byte("Message from client"))


        // Read data
        for {
            
            dataType, data, err := sc.Read()

            if err == nil {
                log.Println("Server recieved: "+string(data)+" - Message type: ", dataType)
            } else {
                log.Println(err)
                break
            }
	    }


        for {
            
            dataType, data, err := cc.Read()

            if err == nil {
                log.Println("Client recieved: "+string(data)+" - Message type: ", dataType)     
            } else {
                log.Println(err)
                break
            }
	    }

Encryption

By default the connection established will be encypted, ECDH384 is used for the key exchange and AES 256 GCM is used for the cipher.

Encryption can be swithed off by passing in a custom configuation to the server & client start functions.

    
    config := &ipc.ServerConfig{Encryption: false}
	sc, err := ipc.StartServer("<name of socket or pipe>", config)

Testing

The package has been tested on Mac, Windows and Linux and has extensive test coverage.

Licence

MIT

Documentation

Index

Constants

This section is empty.

Variables

This section is empty.

Functions

This section is empty.

Types

type Client

type Client struct {
	Name string
	// contains filtered or unexported fields
}

Client - holds the details of the client connection and config.

func StartClient

func StartClient(ipcName string, config *ClientConfig) (*Client, error)

StartClient - start the ipc client.

ipcName = is the name of the unix socket or named pipe that the client will try and connect to. timeout = number of seconds before the socket/pipe times out trying to connect/re-cconnect - if -1 or 0 it never times out. retryTimer = number of seconds before the client tries to connect again.

func (*Client) Close

func (cc *Client) Close()

Close - closes the connection

func (*Client) Read

func (cc *Client) Read() (*Message, error)

Read - blocking function that waits until an non multipart message is recieved returns the message type, data and any error.

func (*Client) Status

func (cc *Client) Status() string

Status - returns the current connection status as a string

func (*Client) StatusCode

func (cc *Client) StatusCode() Status

StatusCode - returns the current connection status

func (*Client) Write

func (cc *Client) Write(msgType int, message []byte) error

Write - writes a non multipart message to the ipc connection. msgType - denotes the type of data being sent. 0 is a reserved type for internal messages and errors.

type ClientConfig

type ClientConfig struct {
	Timeout    float64
	RetryTimer time.Duration
	Encryption bool
}

ClientConfig - used to pass configuation overrides to ClientStart()

type Message

type Message struct {
	MsgType int    // type of message sent - 0 is reserved
	Data    []byte // message data recieved
	Status  string
	// contains filtered or unexported fields
}

Message - contains the recieved message

type Server

type Server struct {
	// contains filtered or unexported fields
}

Server - holds the details of the server connection & config.

func StartServer

func StartServer(ipcName string, config *ServerConfig) (*Server, error)

StartServer - starts the ipc server.

ipcName = is the name of the unix socket or named pipe that will be created. timeout = number of seconds before the socket/pipe times out waiting for a connection/re-cconnection - if -1 or 0 it never times out.

func (*Server) Close

func (sc *Server) Close()

Close - closes the connection

func (*Server) Read

func (sc *Server) Read() (*Message, error)

func (*Server) Status

func (sc *Server) Status() string

Status - returns the current connection status as a string

func (*Server) StatusCode

func (sc *Server) StatusCode() Status

StatusCode - returns the current connection status

func (*Server) Write

func (sc *Server) Write(msgType int, message []byte) error

Write - writes a non multipart message to the ipc connection. msgType - denotes the type of data being sent. 0 is a reserved type for internal messages and errors.

type ServerConfig

type ServerConfig struct {
	Timeout    time.Duration
	MaxMsgSize int
	Encryption bool
}

ServerConfig - used to pass configuation overrides to ServerStart()

type Status

type Status int

Status - Status of the connection

const (

	// NotConnected - 0
	NotConnected Status = iota
	// Listening - 1
	Listening Status = iota
	// Connecting - 2
	Connecting Status = iota
	// Connected - 3
	Connected Status = iota
	// ReConnecting - 4
	ReConnecting Status = iota
	// Closed - 5
	Closed Status = iota
	// Closing - 6
	Closing Status = iota
	// Error - 7
	Error Status = iota
	// Timeout - 8
	Timeout Status = iota
)

func (*Status) String

func (status *Status) String() string

returns the status of the connection as a string

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