WORK IN PROGRESS

Node.js Stratum

Exposes a server to enable Stratum mining protocol (server and client) usage on Node.js and subscribe for events using EventEmitter, and accept stratum-notify from *coind daemons

This is not a ready-to-use miner pool, you may use this server to implement your favorite altcoins, all the pool logic is up to you (shares, passwords, sessions, etc).

Highlights

• Defer and promise based code instead of callbacks (avoid callback hell)
• Simple but powerful API for managing both server and client
• Build-in support for spawn coins daemons (bitcoind, litecoind, etc) process and accept RPC calls
• Easy for you to add your own procedures do the RPC server (using expose)
• No need to worry about .conf files for the daemons, everything is passed through command line the best way possible (but you may override arguments)
• Optimized code reuse with class methods and dependency injection
• All classes based on EventEmitter by default (through the Base class)
• The client part make it easy, along with an RPC server, to setup your own farming pool for coins
• You can create a proxy from it using the Client interface, mix up Stratum with your own RPC definition and commands
• It's up to you to choose the logging module (like winston)

Install

npm install stratum

Notice that you may install this globally using -g, stratum-notify will be available system wide

Stratum notify(if you want to call it manually for testing purposes)

node node_modules/.bin/stratum-notify --host localhost --port 1337 --password willbebase64encoded --type block --data "jsondata"

This command is called automatically if you set the coind options, they are forked when the server is started.

Usage

var Server = require('stratum').Server;

// these settings can be changed using Server.defaults as well, for every new server up
var server = Server.create({
  /**
   * RPC to listen interface for this server
   */
  rpc     : {
    /**
     * Bind to address
     *
     * @type {String}
     */
    host: 'localhost',
    /**
     * RPC port
     *
     * @type {Number}
     */
    port: 1337,
    /**
     * RPC password, this needs to be a SHA256 hash, defaults to 'password'
     * To create a hash out of your password, launch node.js and write
     *
     * require('crypto').createHash('sha256').update('password').digest('hex');
     *
     * @type {String}
     */
    password: '5e884898da28047151d0e56f8dc6292773603d0d6aabbdd62a11ef721d1542d8',
    /**
     * Mode to listen. By default listen only on TCP, but you may use 'http' or 'both' (deal
     * with HTTP and TCP at same time)
     */
    mode: 'tcp'
  },
  /**
   * The server settings itself
   */
  settings: {
    /**
     * Address to set the X-Stratum header if someone connects using HTTP
     * @type {String}
     */
    hostname: 'localhost',
    /**
     * Max server lag before considering the server "too busy" and drop new connections
     * @type {Number}
     */
    toobusy : 70,
    /**
     * Bind to address, use 0.0.0.0 for external access
     * @type {string}
     */
    host    : 'localhost',
    /**
     * Port for the stratum TCP server to listen on
     * @type {Number}
     */
    port    : 3333
  }
});

server.on('mining', function(req, deferred){
    switch (req.method){
        case 'subscribe':
            // req.params[0] -> if filled, it's the User Agent, like CGMiner/CPUMiner sends
            // Just resolve the deferred, the promise will be resolved and the data sent to the connected client
            deferred.resolve([subscription, extranonce1, extranonce2_size]);
            break;
    }
});

server.listen();

You can connect to Stratum servers as well:

var Client = require('stratum').Client;

client = Client.create();

client.connect({
    host: 'localhost',
    port: 3333
}).then(function(){
    return ...;
}).then(function(value){
    if (value){
        //etc
    }
});

Examples

Check the examples folder, each part (client and server) is completely explained, and how to proceed on each possible case.

Documentation

The following documentation expects that:

var stratum = require('stratum');

This module is really modular, you may use just one part of it, without having to touch other classes. For example, you may use the stratum.Client and the stratum.RPCServer without stratum.Daemon or stratum.Server.

You may, at any time, extend, overload or override any classes methods and instance methods (because it uses ES5Class module):

stratum.Server.implement({
    myOwnClassMethodObject: {
    }
});

stratum.Server.myOwnClassMethodObject;

stratum.Server.include({
    niftyFunction: function(isit){
        this.nifty = isit;
    }
});

var server = stratum.Server.create();
server.niftyFunction(true);
server.nifty // true

WARNING: This actually changes the original class. You may create your derived own class using:

var MyNewServer = stratum.Server.define('MyNewServer', {
    // Add your functions here
});

The MyNewServer class will inherit everything from stratum.Server, but will retain all it's functionality. Use $super() to call overloaded methods:

var MyNewServer = stratum.Server.define('MyNewServer', {
    sendToIt: function(){
        this.$super(); // call the original function sendToId
    }
});

Notice that most of the functions that would return a callback (Node style), it return a deferred promise. If you are not sure about how to use promises, go read q module page

Basically, with promises, you can resolve or reject a "future" value to something. It's more or less a callback, but it's centralized on one instance, that is the deferred.

server.listen().then(
    // first parameter is the "resolved" or "success"
    function(){
    },
    // second parameter is the "rejected" or "fail",
    function(){
    },
    // third parameter is the "progress", and it's not used anywhere in this module at the moment
    function(){
    }
);

Base

Available through stratum.Base

All the classes inherit from the base class, that inherits from EventEmitter, and got 2 methods:

freezeProperty(where, obj)

It's a shortcut to make options readonly, useful for sensitive options that must not change. Uses Object.defineProperty and Object.freeze

this.opts = {};
// opts = the current opts member of the class
// options = the options to be 'set in stone'
this.freezeProperty('opts', options);

this.opts.change = false; // won't have an effect and throw an error in strict mode

debug(msg)

Show debug messages for the class only if DEBUG=stratum environment variable is set

stratum.Base.debug('oops');

Server

Available through stratum.Server

You can write your own defaults that applies to all new server instances through stratum.Server.defaults

stratum.Server.defaults.settings.toobusy = 50;

You can also include your own stratum method calls through stratum.Server.commands object, the server will lookup them automatically and provide it in the event emitted callback. The 'mining.' prefix is expected, so if you put 'hashes', it expects the command to be mining.hashes

stratum.Server.commands.hashes = function(id, any, params, you, want, to, pass, to, the, client){
    // this function is actually the "resolved" function, that sends data back to the client
    // it's reached by using deferred.resolve([...params...]); in the emitted callback

    // "this" is the current socket
    // "id" is the current RPC call id and is non-optional, must be always the first parameter

    // you should always return something like this:
    return this.stratumSend({
        error: null,
        result: [any, params, you, want], // your result
        id: id
    });
};

// the event `mining.hashes` will be fired on the callback

server.on('mining', function(req, deferred){
    if (req.method === 'hashes'){
        deferred.resolve([any, params, you, want, to, pass, to, the, client]);
        // or reject
        deferred.reject([any, params, you, want, to, pass, to, the, client]);
    }
});

// mining.error event is emitted when something is wrong, mining related

server.on('mining.error', function(){

});

// the stratum.Server also holds defaults for coins daemons
console.log(stratum.Server.daemons); // a list of pre-configured daemons in stratum.Server.daemons

// You can inject them into the server later on, using stratum.Daemon

//instantiates a bitcoin stratum.Daemon and places inside the server
server.addDaemon(stratum.Server.daemons.bitcoin);

// you can instantiate using your own instance as well
server.addDaemon(stratum.Daemon.create({
    'name': 'MyExampleCoin',
    /*...*/
}));

RPCServer

Available through stratum.RPCServer.

Enables you to communicate from outside the Stratum module through an JSON RPC 2.0 interface. It's optional, and you don't need to enable it, you may communicate from inside out only.

It's mainly useful to receive notifications (wallet, block and alert), like the stratum-notify bin to receive json data from the outside, but you may extend the interface to accept any other commands that you deem necessary for your app.

It's advised to bind the RPCServer instance to either localhost or an internal IP range, and/or access through trusted proxies.

NOTICE: Once you create an RPCServer, for security reasons, the options can't be changed, by default. If you want to disable this, pass in {lock: false} to the create

var rpc = stratum.RPCServer.create({
          'lock': true,
          'mode': 'tcp', // can be 'tcp', 'http', 'both' (can handle TCP and HTTP/Websockets on one port)
          'port': 9999,
          'host': 'localhost', // bind to localhost
          'password': 'a665a45920422f9d417e4867efdc4fb8a04a1f3fff1fa07e998e86f7f7a27ae3' // SHA256 hash of the password, no plain text!
        });

rpc.listen(); // listens on port 9999, binding to localhost

rpc.expose('mymethod', function(args, connection, callback){
    // if you want to pass an error, use the first callback parameter
    callback(error);
    // otherwise, pass the result through the second parameter
    callback(null, result);
});

// RPC calls like {"method":"mymethod","params":[1,"2"],"id":1}, the args parameter will receive only the [1,"2"]

Client

Available through stratum.Client

The client can connect to a stratum server and send and receive commands like if it was a miner.

The main reason for this part of the module is that you can setup a stratum proxy using it, to forward raw data (or even a command line call) to a stratum server.

You may also test your pool sending arbitrary test data to see if it's responding properly.

var client = stratum.Client.create();

client.on('mining.error', function(message){
});

client.on('mining', function(req, deferred){
    // this
});

client.connect(8080, 'localhost').then(function(socket){
    socket.stratumSubscribe('NodeMiner');
    socket.stratumAuthorize('user','pass');
    socket.stratumSubmit('worker', 'job_id', 'extranonce2', 'ntime', 'nonce');
    socket.stratumSend(data, true); //send a stratum command other than the previous ones
    socket.send(data); // send raw data through the socket
});

Daemon

Available through stratum.Daemon

Include or change the global configuration for daemons using the stratum.Server.daemons member. It's not set per instance, but rather globally.

The options path, args, notifyPath, notify are optional

stratum.Server.daemons['sillycoin'] = {
    'path': '/usr/bin/sillycoind', // optional
    'args': ['debug'], // optional
    'rpcserver': { // this whole block is optional, this is the stratum server RPC (not the daemon one))
        'port': 8888,
        'host': 'localhost',
        'password': 'rpcpassword',
        'notifyPath': './node_modules/.bin/stratum-notify', // optional
        'notify': ['block', 'wallet', 'alert'], // optional, will build walletnotify, blocknotify and alertnotify parameters
    }
    'name': 'SillyCoin',
    'user': 'rpcuser',
    'password': 'rpcpassword',
    'port': 0xDEAD,
    'host': 'localhost'
};

You can start issuing commands to the daemon BEFORE calling start(), usually when you already have it running. start() will attempt to spawn the process.

var daemon = stratum.Daemon.create({
        'path': '/usr/bin/sillycoind',
        'name': 'SillyCoin',
        'user': 'rpcuser',
        'password': 'rpcpassword',
        'port': 0xDEAD,
        'host': 'localhost',
        'args': ['debug']
    });

daemon.start();

daemon.call('getinfo', []).then(
    // daemon returned a result
    function(result){
        console.log(result.balance);
    },
    // daemon returned an error
    function(result){
        console.log(result); // usually "Command timed out" or "Unauthorized access"
    }
);

Utils

Node-Stratum comes with a few already used common util libraries, that can be accessed through stratum.*, that are:

• Lo-dash through stratum.lodash
• Filesystem through stratum.fs
• through stratum.net
• UUID through stratum.uuid
• Q promises through stratum.q
• JSON RPC 2.0 through stratum.rpc

Use at will.

Debugging

Export/set the environment variable DEBUG=stratum on your command line before executing your code, that you'll be able to see everything behind the hood inside this module on the command line.

You can additionally set DEBUG=stratum,jsonrpc to also see the RPC part in-depth (for stratum.Daemon and stratum.RPCServer)

Do you like it? Wanna support the development?

npm star stratum

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