102 lines
1.9 KiB
JavaScript
102 lines
1.9 KiB
JavaScript
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/**
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* Module dependencies.
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*/
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var debug = require('debug')('axon:req');
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var queue = require('../plugins/queue');
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var slice = require('../utils').slice;
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var Message = require('amp-message');
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var Socket = require('./sock');
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/**
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* Expose `ReqSocket`.
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*/
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module.exports = ReqSocket;
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/**
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* Initialize a new `ReqSocket`.
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*
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* @api private
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*/
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function ReqSocket() {
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Socket.call(this);
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this.n = 0;
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this.ids = 0;
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this.callbacks = {};
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this.identity = this.get('identity');
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this.use(queue());
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}
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/**
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* Inherits from `Socket.prototype`.
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*/
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ReqSocket.prototype.__proto__ = Socket.prototype;
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/**
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* Return a message id.
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*
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* @return {String}
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* @api private
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*/
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ReqSocket.prototype.id = function(){
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return this.identity + ':' + this.ids++;
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};
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/**
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* Emits the "message" event with all message parts
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* after the null delimeter part.
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*
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* @param {net.Socket} sock
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* @return {Function} closure(msg, multipart)
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* @api private
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*/
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ReqSocket.prototype.onmessage = function(){
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var self = this;
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return function(buf){
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var msg = new Message(buf);
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var id = msg.pop();
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var fn = self.callbacks[id];
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if (!fn) return debug('missing callback %s', id);
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fn.apply(null, msg.args);
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delete self.callbacks[id];
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};
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};
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/**
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* Sends `msg` to the remote peers. Appends
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* the null message part prior to sending.
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*
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* @param {Mixed} msg
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* @api public
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*/
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ReqSocket.prototype.send = function(msg){
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var socks = this.socks;
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var len = socks.length;
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var sock = socks[this.n++ % len];
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var args = slice(arguments);
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if (sock) {
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var hasCallback = 'function' == typeof args[args.length - 1];
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if (!hasCallback) args.push(function(){});
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var fn = args.pop();
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fn.id = this.id();
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this.callbacks[fn.id] = fn;
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args.push(fn.id);
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}
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if (sock) {
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sock.write(this.pack(args));
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} else {
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debug('no connected peers');
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this.enqueue(args);
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}
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};
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