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'use strict';
var assert = require('assert');
var net = require('net');
var util = require('util');
var Buffer = require('buffer').Buffer;
var Transform = require('stream').Transform;
exports.start = function start() {
var agent = new Agent();
// Do not let `agent.listen()` request listening from cluster master
var cluster = require('cluster');
cluster.isWorker = false;
cluster.isMaster = true;
agent.on('error', function(err) {
process._rawDebug(err.stack || err);
});
agent.listen(process._debugAPI.port, function() {
var addr = this.address();
process._rawDebug('Debugger listening on port %d', addr.port);
process._debugAPI.notifyListen();
});
// Just to spin-off events
// TODO(indutny): Figure out why node.cc isn't doing this
setImmediate(function() {
});
process._debugAPI.onclose = function() {
// We don't care about it, but it prevents loop from cleaning up gently
// NOTE: removeAllListeners won't work, as it doesn't call `removeListener`
process.listeners('SIGWINCH').forEach(function(fn) {
process.removeListener('SIGWINCH', fn);
});
agent.close();
};
// Not used now, but anyway
return agent;
};
function Agent() {
net.Server.call(this, this.onConnection);
this.first = true;
this.binding = process._debugAPI;
var self = this;
this.binding.onmessage = function(msg) {
self.clients.forEach(function(client) {
client.send({}, msg);
});
};
this.clients = [];
assert(this.binding, 'Debugger agent running without bindings!');
}
util.inherits(Agent, net.Server);
Agent.prototype.onConnection = function onConnection(socket) {
var c = new Client(this, socket);
c.start();
this.clients.push(c);
var self = this;
c.once('close', function() {
var index = self.clients.indexOf(c);
assert(index !== -1);
self.clients.splice(index, 1);
});
};
Agent.prototype.notifyWait = function notifyWait() {
if (this.first)
this.binding.notifyWait();
this.first = false;
};
function Client(agent, socket) {
Transform.call(this, {
readableObjectMode: true
});
this.agent = agent;
this.binding = this.agent.binding;
this.socket = socket;
// Parse incoming data
this.state = 'headers';
this.headers = {};
this.buffer = '';
socket.pipe(this);
this.on('data', this.onCommand);
var self = this;
this.socket.on('close', function() {
self.destroy();
});
}
util.inherits(Client, Transform);
Client.prototype.destroy = function destroy(msg) {
this.socket.destroy();
this.emit('close');
};
Client.prototype._transform = function _transform(data, enc, cb) {
cb();
this.buffer += data;
while (true) {
if (this.state === 'headers') {
// Not enough data
if (!/\r\n/.test(this.buffer))
break;
if (/^\r\n/.test(this.buffer)) {
this.buffer = this.buffer.slice(2);
this.state = 'body';
continue;
}
// Match:
// Header-name: header-value\r\n
var match = this.buffer.match(/^([^:\s\r\n]+)\s*:\s*([^\s\r\n]+)\r\n/);
if (!match)
return this.destroy('Expected header, but failed to parse it');
this.headers[match[1].toLowerCase()] = match[2];
this.buffer = this.buffer.slice(match[0].length);
} else {
var len = this.headers['content-length'];
if (len === undefined)
return this.destroy('Expected content-length');
len = len | 0;
if (Buffer.byteLength(this.buffer) < len)
break;
this.push(new Command(this.headers, this.buffer.slice(0, len)));
this.state = 'headers';
this.buffer = this.buffer.slice(len);
this.headers = {};
}
}
};
Client.prototype.send = function send(headers, data) {
if (!data)
data = '';
var out = [];
Object.keys(headers).forEach(function(key) {
out.push(key + ': ' + headers[key]);
});
out.push('Content-Length: ' + Buffer.byteLength(data), '');
this.socket.cork();
this.socket.write(out.join('\r\n') + '\r\n');
if (data.length > 0)
this.socket.write(data);
this.socket.uncork();
};
Client.prototype.start = function start() {
this.send({
Type: 'connect',
'V8-Version': process.versions.v8,
'Protocol-Version': 1,
'Embedding-Host': 'node ' + process.version
});
};
Client.prototype.onCommand = function onCommand(cmd) {
this.binding.sendCommand(cmd.body);
this.agent.notifyWait();
};
function Command(headers, body) {
this.headers = headers;
this.body = body;
}
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