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'use strict';
var util = require('util');
var EventEmitter = require('events').EventEmitter;
function Hose(socket, options, filter) {
EventEmitter.call(this);
if (typeof options === 'function') {
filter = options;
options = {};
}
this.socket = socket;
this.options = options;
this.filter = filter;
this.buffer = null;
var self = this;
this.listeners = {
error: function(err) {
return self.onError(err);
},
data: function(chunk) {
return self.onData(chunk);
},
end: function() {
return self.onEnd();
}
};
this.socket.on('error', this.listeners.error);
this.socket.on('data', this.listeners.data);
this.socket.on('end', this.listeners.end);
}
util.inherits(Hose, EventEmitter);
module.exports = Hose;
Hose.create = function create(socket, options, filter) {
return new Hose(socket, options, filter);
};
Hose.prototype.detach = function detach() {
// Stop the flow
this.socket.pause();
this.socket.removeListener('error', this.listeners.error);
this.socket.removeListener('data', this.listeners.data);
this.socket.removeListener('end', this.listeners.end);
};
Hose.prototype.reemit = function reemit() {
var buffer = this.buffer;
this.buffer = null;
// Modern age
if (this.socket.unshift) {
this.socket.unshift(buffer);
if (this.socket.listeners('data').length > 0)
this.socket.resume();
return;
}
// Rusty node v0.8
if (this.socket.ondata)
this.socket.ondata(buffer, 0, buffer.length);
this.socket.emit('data', buffer);
this.socket.resume();
};
Hose.prototype.onError = function onError(err) {
this.detach();
this.emit('error', err);
};
Hose.prototype.onData = function onData(chunk) {
if (this.buffer)
this.buffer = Buffer.concat([ this.buffer, chunk ]);
else
this.buffer = chunk;
var self = this;
this.filter(this.buffer, function(err, protocol) {
if (err)
return self.onError(err);
// No protocol selected yet
if (!protocol)
return;
self.detach();
self.emit('select', protocol, self.socket);
self.reemit();
});
};
Hose.prototype.onEnd = function onEnd() {
this.detach();
this.emit('error', new Error('Not enough data to recognize protocol'));
};