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    @rokt33r/node-ipc

    5.0.4 • Public • Published

    node-ipc

    a nodejs module for local and remote Inter Process Communication with full support for Linux, Mac and Windows.
    A great solution for Neural Networking in Node.JS

    npm install node-ipc

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    Package details websites :

    This work is licenced via the DBAD Public Licence.


    Contents

    1. Types of IPC Sockets and Supporting OS
    2. IPC Methods
      1. log
      2. connectTo
      3. connectToNet
      4. disconnect
      5. serve
      6. serveNet
    3. IPC Stores and Default Variables
    4. IPC Events
    5. Basic Examples
      1. Server for Unix||Windows Sockets & TCP Sockets
      2. Client for Unix||Windows Sockets & TCP Sockets
      3. Server & Client for UDP Sockets
      4. Raw Buffers or Binary Sockets
    6. Working with TLS/SSL Socket Servers & Clients
    7. Advanced Examples

    Types of IPC Sockets

    Type Stability Definition
    Unix Socket or Windows Socket Stable Gives Linux, Mac, and Windows lightning fast communication and avoids the network card to reduce overhead and latency. Local Unix and Windows Socket examples
    TCP Socket Stable Gives the most reliable communication across the network. Can be used for local IPC as well, but is slower than #1's Unix Socket Implementation because TCP sockets go through the network card while Unix Sockets and Windows Sockets do not. Local or remote network TCP Socket examples
    TLS Socket Stable Configurable and secure network socket over SSL. Equivalent to https. TLS/SSL documentation
    UDP Sockets Stable Gives the fastest network communication. UDP is less reliable but much faster than TCP. It is best used for streaming non critical data like sound, video, or multiplayer game data as it can drop packets depending on network connectivity and other factors. UDP can be used for local IPC as well, but is slower than #1's Unix Socket or Windows Socket Implementation because UDP sockets go through the network card while Unix and Windows Sockets do not. Local or remote network UDP Socket examples
    OS Supported Sockets
    Linux Unix, Posix, TCP, TLS, UDP
    Mac Unix, Posix, TCP, TLS, UDP
    Win Windows, TCP, TLS, UDP

    ipc.config

    Set these variables in the ipc.config scope to overwrite or set default values.

     
        {
            appspace        : 'app.',
            socketRoot      : '/tmp/',
            id              : os.hostname(),
            networkHost     : 'localhost', //should resolve to 127.0.0.1 or ::1 see the table below related to this
            networkPort     : 8000,
            encoding        : 'utf8',
            rawBuffer       : false,
            sync            : false,
            silent          : false,
            maxConnections  : 100,
            retry           : 500,
            maxRetries      : false,
            stopRetrying    : false
        }
     
    variable documentation
    appspace used for Unix Socket (Unix Domain Socket) namespacing. If not set specifically, the Unix Domain Socket will combine the socketRoot, appspace, and id to form the Unix Socket Path for creation or binding. This is available incase you have many apps running on your system, you may have several sockets with the same id, but if you change the appspace, you will still have app specic unique sockets.
    socketRoot the directory in which to create or bind to a Unix Socket
    id the id of this socket or service
    networkHost the local or remote host on which TCP, TLS or UDP Sockets should connect
    networkPort the default port on which TCP, TLS, or UDP sockets should connect
    encoding the default encoding for data sent on sockets. Mostly used if rawBuffer is set to true. Valid values are : ascii utf8 utf16le ucs2 base64 hex .
    rawBuffer if true, data will be sent and received as a raw node Buffer NOT an Object as JSON. This is great for Binary or hex IPC, and communicating with other processes in languages like C and C++
    sync synchronous requests. Clients will not send new requests until the server answers.
    silent turn on/off logging default is false which means logging is on
    maxConnections this is the max number of connections allowed to a socket. It is currently only being set on Unix Sockets. Other Socket types are using the system defaults.
    retry this is the time in milliseconds a client will wait before trying to reconnect to a server if the connection is lost. This does not effect UDP sockets since they do not have a client server relationship like Unix Sockets and TCP Sockets.
    maxRetries if set, it represents the maximum number of retries after each disconnect before giving up and completely killing a specific connection
    stopRetrying Defaults to false meaning clients will continue to retry to connect to servers indefinitely at the retry interval. If set to any number the client will stop retrying when that number is exceeded after each disconnect. If set to true in real time it will immediately stop trying to connect regardless of maxRetries. If set to 0, the client will NOT try to reconnect.

    IPC Methods

    These methods are available in the IPC Scope.


    log

    ipc.log(a,b,c,d,e...);

    ipc.log will accept any number of arguments and if ipc.config.silent is not set, it will concat them all with a sincle space ' ' between them and then log them to the console. This is fast because it prevents any concatenation from happening if the ipc is set to silent. That way if you leave your logging in place it should not effect performance.

    The log also supports colors implementation. All of the available styles are supported and the theme styles are as follows :

     
        {
            good    : 'green',
            notice  : 'yellow',
            warn    : 'red',
            error   : 'redBG',
            debug   : 'magenta',
            variable: 'cyan',
            data    : 'blue'
        }    
     

    You can override any of these settings by requireing colors and setting the theme as follows :

     
        var colors=require('colors');
     
        colors.setTheme(
            {
                good    : 'zebra',
                notice  : 'redBG',
                ...
            }    
        );
     

    connectTo

    ipc.connectTo(id,path,callback);

    Used for connecting as a client to local Unix Sockets and Windows Sockets. This is the fastst way for processes on the same machine to communicate because it bypasses the network card which TCP and UDP must both use.

    variable required definition
    id required is the string id of the socket being connected to. The socket with this id is added to the ipc.of object when created.
    path optional is the path of the Unix Domain Socket File, if the System is Windows, this will automatically be converted to an appropriate pipe with the same information as the Unix Domain Socket File. If not set this will default to ipc.config.socketRoot+ipc.config.appspace+id
    callback optional this is the function to execute when the socket has been created.

    examples arguments can be ommitted so long as they are still in order.

     
        ipc.connectTo('world');
     

    or using just an id and a callback

     
        ipc.connectTo(
            'world',
            function(){
                ipc.of.world.on(
                    'hello',
                    function(data){
                        ipc.log(data.debug);
                        //if data was a string, it would have the color set to the debug style applied to it
                    }
                )
            }
        );
     

    or explicitly setting the path

     
        ipc.connectTo(
            'world',
            'myapp.world'
        );
     

    or explicitly setting the path with callback

     
        ipc.connectTo(
            'world',
            'myapp.world',
            function(){
                ...
            }
        );
     

    connectToNet

    ipc.connectToNet(id,host,port,callback)

    Used to connect as a client to a TCP or TLS socket via the network card. This can be local or remote, if local, it is recommended that you use the Unix and Windows Socket Implementaion of connectTo instead as it is much faster since it avoids the network card altogether.

    For TLS and SSL Sockets see the node-ipc TLS and SSL docs. They have a few additional requirements, and things to know about and so have their own doc.

    variable required definition
    id required is the string id of the socket being connected to. For TCP & TLS sockets, this id is added to the ipc.of object when the socket is created with a reference to the socket.
    host optional is the host on which the TCP or TLS socket resides. This will default to ipc.config.networkHost if not specified.
    port optional the port on which the TCP or TLS socket resides.
    callback optional this is the function to execute when the socket has been created.

    examples arguments can be ommitted so long as they are still in order.
    So while the default is : (id,host,port,callback), the following examples will still work because they are still in order (id,port,callback) or (id,host,callback) or (id,port) etc.

     
        ipc.connectToNet('world');
     

    or using just an id and a callback

     
        ipc.connectToNet(
            'world',
            function(){
                ...
            }
        );
     

    or explicitly setting the host and path

     
        ipc.connectToNet(
            'world',
            'myapp.com',serve(path,callback)
            3435
        );
     

    or only explicitly setting port and callback

     
        ipc.connectToNet(
            'world',
            3435,
            function(){
                ...
            }
        );
     

    disconnect

    ipc.disconnect(id)

    Used to disconnect a client from a Unix, Windows, TCP or TLS socket. The socket and its refrence will be removed from memory and the ipc.of scope. This can be local or remote. UDP clients do not maintain connections and so there are no Clients and this method has no value to them.

    variable required definition
    id required is the string id of the socket from which to disconnect.

    examples

     
        ipc.disconnect('world');
     

    serve

    ipc.serve(path,callback);

    Used to create local Unix Socket Server or Windows Socket Server to which Clients can bind. The server can emit events to specific Client Sockets, or broadcast events to all known Client Sockets.

    variable required definition
    path optional This is the path of the Unix Domain Socket File, if the System is Windows, this will automatically be converted to an appropriate pipe with the same information as the Unix Domain Socket File. If not set this will default to ipc.config.socketRoot+ipc.config.appspace+id
    callback optional This is a function to be called after the Server has started. This can also be done by binding an event to the start event like ipc.server.on('start',function(){});

    examples arguments can be omitted so long as they are still in order.

     
        ipc.serve();
     

    or specifying callback

     
        ipc.serve(
            function(){...}
        );
     

    or specify path

     
        ipc.serve(
            '/tmp/myapp.myservice'
        );
     

    or specifying everything

     
        ipc.serve(
            '/tmp/myapp.myservice',
            function(){...}
        );
     

    serveNet

    serveNet(host,port,UDPType,callback)

    Used to create TCP, TLS or UDP Socket Server to which Clients can bind or other servers can send data to. The server can emit events to specific Client Sockets, or broadcast events to all known Client Sockets.

    variable required definition
    host optional If not specified this defaults to the first address in os.networkInterfaces(). For TCP, TLS & UDP servers this is most likely going to be 127.0.0.1 or ::1
    port optional The port on wunich the TCP, UDP, or TLS Socket server will be bound, this defaults to 8000 if not specified
    UDPType optional If set this will create the server as a UDP socket. 'udp4' or 'udp6' are valid values. This defaults to not being set.
    callback optional Function to be called when the server is created

    examples arguments can be ommitted solong as they are still in order.

    default tcp server

     
        ipc.serveNet();
     

    default udp server

     
        ipc.serveNet('udp4');
     

    or specifying TCP server with callback

     
        ipc.serveNet(
            function(){...}
        );
     

    or specifying UDP server with callback

     
        ipc.serveNet(
            'udp4',
            function(){...}
        );
     

    or specify port

     
        ipc.serveNet(
            3435
        );
     

    or specifying everything TCP

     
        ipc.serveNet(
            'MyMostAwesomeApp.com',
            3435,
            function(){...}
        );
     

    or specifying everything UDP

     
        ipc.serveNet(
            'MyMostAwesomeApp.com',
            3435,
            'udp4',
            function(){...}
        );
     

    IPC Stores and Default Variables

    variable definition
    ipc.of This is where socket connection refrences will be stored when connecting to them as a client via the ipc.connectTo or iupc.connectToNet. They will be stored based on the ID used to create them, eg : ipc.of.mySocket
    ipc.server This is a refrence to the server created by ipc.serve or ipc.serveNet

    IPC Events

    event name params definition
    error err obj triggered when an error has occured
    connect triggered when socket connected
    disconnect triggered when socket disconnected
    destroy triggered when socket has been totally destroyed, no further auto retries will happen and all references are gone.
    data buffer triggered when ipc.config.rawBuffer is true and a message is received.
    your event type your event data triggered when a JSON message is received. The event name will be the type string from your message and the param will be the data object from your message eg : { type:'myEvent',data:{a:1}}

    Basic Examples

    You can find Advanced Examples in the examples folder. In the examples you will find more complex demos including multi client examples.

    Server for Unix Sockets, Windows Sockets & TCP Sockets

    The server is the process keeping a socket for IPC open. Multiple sockets can connect to this server and talk to it. It can also broadcast to all clients or emit to a specific client. This is the most basic example which will work for local Unix and Windows Sockets as well as local or remote network TCP Sockets.

     
        var ipc=require('node-ipc');
     
        ipc.config.id   = 'world';
        ipc.config.retry= 1500;
     
        ipc.serve(
            function(){
                ipc.server.on(
                    'message',
                    function(data,socket){
                        ipc.log('got a message : '.debug, data);
                        ipc.server.emit(
                            socket,
                            'message',  //this can be anything you want so long as
                                        //your client knows.
                            data+' world!'
                        );
                    }
                );
            }
        );
     
        ipc.server.start();
     

    Client for Unix Sockets & TCP Sockets

    The client connects to the servers socket for Inter Process Communication. The socket will receive events emitted to it specifically as well as events which are broadcast out on the socket by the server. This is the most basic example which will work for both local Unix Sockets and local or remote network TCP Sockets.

     
        var ipc=require('node-ipc');
     
        ipc.config.id   = 'hello';
        ipc.config.retry= 1500;
     
        ipc.connectTo(
            'world',
            function(){
                ipc.of.world.on(
                    'connect',
                    function(){
                        ipc.log('## connected to world ##'.rainbow, ipc.config.delay);
                        ipc.of.world.emit(
                            'message',  //any event or message type your server listens for
                            'hello'
                        )
                    }
                );
                ipc.of.world.on(
                    'disconnect',
                    function(){
                        ipc.log('disconnected from world'.notice);
                    }
                );
                ipc.of.world.on(
                    'message',  //any event or message type your server listens for
                    function(data){
                        ipc.log('got a message from world : '.debug, data);
                    }
                );
            }
        );
     

    Server & Client for UDP Sockets

    UDP Sockets are different than Unix, Windows & TCP Sockets because they must be bound to a unique port on their machine to receive messages. For example, A TCP, Unix, or Windows Socket client could just connect to a separate TCP, Unix, or Windows Socket sever. That client could then exchange, both send and receive, data on the servers port or location. UDP Sockets can not do this. They must bind to a port to receive or send data.

    This means a UDP Client and Server are the same thing because in order to receive data, a UDP Socket must have its own port to receive data on, and only one process can use this port at a time. It also means that in order to emit or broadcast data the UDP server will need to know the host and port of the Socket it intends to broadcast the data to.

    This is the most basic example which will work for both local and remote UDP Sockets.

    UDP Server 1 - "World"
     
        var ipc=require('../../../node-ipc');
     
        ipc.config.id   = 'world';
        ipc.config.retry= 1500;
     
        ipc.serveNet(
            'udp4',
            function(){
                console.log(123);
                ipc.server.on(
                    'message',
                    function(data,socket){
                        ipc.log('got a message from '.debug, data.from.variable ,' : '.debug, data.message.variable);
                        ipc.server.emit(
                            socket,
                            'message',
                            {
                                from    : ipc.config.id,
                                message : data.message+' world!'
                            }
                        );
                    }
                );
     
                console.log(ipc.server);
            }
        );
     
        ipc.server.start();
     
    UDP Server 2 - "Hello"

    note we set the port here to 8001 because the world server is already using the default ipc.config.networkPort of 8000. So we can not bind to 8000 while world is using it.

     
        ipc.config.id   = 'hello';
        ipc.config.retry= 1500;
     
        ipc.serveNet(
            8001,
            'udp4',
            function(){
                ipc.server.on(
                    'message',
                    function(data){
                        ipc.log('got Data');
                        ipc.log('got a message from '.debug, data.from.variable ,' : '.debug, data.message.variable);
                    }
                );
                ipc.server.emit(
                    {
                        address : '127.0.0.1', //any hostname will work
                        port    : ipc.config.networkPort
                    },
                    'message',
                    {
                        from    : ipc.config.id,
                        message : 'Hello'
                    }
                );
            }
        );
     
        ipc.server.start();
     

    Raw Buffer or Binary Sockets

    Binary or Buffer sockets can be used with any of the above socket types, however the way data events are emit is slightly different.

    When setting up a rawBuffer socket you must specify it as such :

     
        ipc.config.rawBuffer=true;
     

    You can also specify its encoding type. The default is utf8

     
        ipc.config.encoding='utf8';
     

    emit string buffer :

     
        //server
        ipc.server.emit(
            socket,
            'hello'
        );
     
        //client
        ipc.of.world.emit(
            'hello'
        )
     

    emit byte array buffer :

     
        //server
        ipc.server.emit(
            socket,
            [10,20,30]
        );
     
        //client
        ipc.server.emit(
            [10,20,30]
        );
     

    emit hex array buffer :

     
        //server
        ipc.server.emit(
            socket,
            [0x05,0x6d,0x5c]
        );
     
        //client
        ipc.server.emit(
            [0x05,0x6d,0x5c]
        );
     

    Licensed under DBAD license

    See the DBAD license in your language or our licence.md file.

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