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| var logger = require('pomelo-logger').getLogger('pomelo-rpc', 'mqtt-mailbox');
var EventEmitter = require('events').EventEmitter;
var constants = require('../../util/constants');
var Tracer = require('../../util/tracer');
var MqttCon = require('mqtt-connection');
var utils = require('../../util/utils');
var util = require('util');
var net = require('net');
var CONNECT_TIMEOUT = 2000;
var MailBox = function(server, opts) {
EventEmitter.call(this);
this.curId = 0;
this.id = server.id;
this.host = server.host;
this.port = server.port;
this.requests = {};
this.timeout = {};
this.queue = [];
this.bufferMsg = opts.bufferMsg;
this.keepalive = opts.keepalive || constants.DEFAULT_PARAM.KEEPALIVE;
this.interval = opts.interval || constants.DEFAULT_PARAM.INTERVAL;
this.timeoutValue = opts.timeout || constants.DEFAULT_PARAM.CALLBACK_TIMEOUT;
this.keepaliveTimer = null;
this.lastPing = -1;
this.lastPong = -1;
this.connected = false;
this.closed = false;
this.opts = opts;
this.serverId = opts.context.serverId;
};
util.inherits(MailBox, EventEmitter);
MailBox.prototype.connect = function(tracer, cb) {
tracer && tracer.info('client', __filename, 'connect', 'mqtt-mailbox try to connect');
if (this.connected) {
tracer && tracer.error('client', __filename, 'connect', 'mailbox has already connected');
return cb(new Error('mailbox has already connected.'));
}
var self = this;
var stream = net.createConnection(this.port, this.host);
this.socket = MqttCon(stream);
var connectTimeout = setTimeout(function() {
logger.error('rpc client %s connect to remote server %s timeout', self.serverId, self.id);
self.emit('close', self.id);
}, CONNECT_TIMEOUT);
this.socket.connect({
clientId: 'MQTT_RPC_' + Date.now()
}, function() {
if (self.connected) {
return;
}
clearTimeout(connectTimeout);
self.connected = true;
if (self.bufferMsg) {
self._interval = setInterval(function() {
flush(self);
}, self.interval);
}
self.setupKeepAlive();
cb();
});
this.socket.on('publish', function(pkg) {
pkg = pkg.payload.toString();
try {
pkg = JSON.parse(pkg);
if (pkg instanceof Array) {
processMsgs(self, pkg);
} else {
processMsg(self, pkg);
}
} catch (err) {
logger.error('rpc client %s process remote server %s message with error: %s', self.serverId, self.id, err.stack);
}
});
this.socket.on('error', function(err) {
logger.error('rpc socket %s is error, remote server %s host: %s, port: %s', self.serverId, self.id, self.host, self.port);
self.emit('close', self.id);
});
this.socket.on('pingresp', function() {
self.lastPong = Date.now();
});
this.socket.on('disconnect', function(reason) {
logger.error('rpc socket %s is disconnect from remote server %s, reason: %s', self.serverId, self.id, reason);
var reqs = self.requests;
for (var id in reqs) {
var ReqCb = reqs[id];
ReqCb(tracer, new Error(self.serverId + ' disconnect with remote server ' + self.id));
}
self.emit('close', self.id);
});
};
/**
* close mailbox
*/
MailBox.prototype.close = function() {
if (this.closed) {
return;
}
this.closed = true;
this.connected = false;
if (this._interval) {
clearInterval(this._interval);
this._interval = null;
}
this.socket.destroy();
};
/**
* send message to remote server
*
* @param msg {service:"", method:"", args:[]}
* @param opts {} attach info to send method
* @param cb declaration decided by remote interface
*/
MailBox.prototype.send = function(tracer, msg, opts, cb) {
tracer && tracer.info('client', __filename, 'send', 'mqtt-mailbox try to send');
if (!this.connected) {
tracer && tracer.error('client', __filename, 'send', 'mqtt-mailbox not init');
cb(tracer, new Error(this.serverId + ' mqtt-mailbox is not init ' + this.id));
return;
}
if (this.closed) {
tracer && tracer.error('client', __filename, 'send', 'mailbox has already closed');
cb(tracer, new Error(this.serverId + ' mqtt-mailbox has already closed ' + this.id));
return;
}
var id = this.curId++;
this.requests[id] = cb;
setCbTimeout(this, id, tracer, cb);
var pkg;
if (tracer && tracer.isEnabled) {
pkg = {
traceId: tracer.id,
seqId: tracer.seq,
source: tracer.source,
remote: tracer.remote,
id: id,
msg: msg
};
} else {
pkg = {
id: id,
msg: msg
};
}
if (this.bufferMsg) {
enqueue(this, pkg);
} else {
doSend(this.socket, pkg);
}
};
MailBox.prototype.setupKeepAlive = function() {
var self = this;
this.keepaliveTimer = setInterval(function() {
self.checkKeepAlive();
}, this.keepalive);
}
MailBox.prototype.checkKeepAlive = function() {
if (this.closed) {
return;
}
// console.log('checkKeepAlive lastPing %d lastPong %d ~~~', this.lastPing, this.lastPong);
var now = Date.now();
var KEEP_ALIVE_TIMEOUT = this.keepalive * 2;
if (this.lastPing > 0) {
if (this.lastPong < this.lastPing) {
if (now - this.lastPing > KEEP_ALIVE_TIMEOUT) {
logger.error('mqtt rpc client %s checkKeepAlive timeout from remote server %s for %d lastPing: %s lastPong: %s', this.serverId, this.id, KEEP_ALIVE_TIMEOUT, this.lastPing, this.lastPong);
this.emit('close', this.id);
this.lastPing = -1;
// this.close();
}
} else {
this.socket.pingreq();
this.lastPing = Date.now();
}
} else {
this.socket.pingreq();
this.lastPing = Date.now();
}
}
var enqueue = function(mailbox, msg) {
mailbox.queue.push(msg);
};
var flush = function(mailbox) {
if (mailbox.closed || !mailbox.queue.length) {
return;
}
doSend(mailbox.socket, mailbox.queue);
mailbox.queue = [];
};
var doSend = function(socket, msg) {
socket.publish({
topic: 'rpc',
payload: JSON.stringify(msg)
});
}
var processMsgs = function(mailbox, pkgs) {
for (var i = 0, l = pkgs.length; i < l; i++) {
processMsg(mailbox, pkgs[i]);
}
};
var processMsg = function(mailbox, pkg) {
var pkgId = pkg.id;
clearCbTimeout(mailbox, pkgId);
var cb = mailbox.requests[pkgId];
if (!cb) {
return;
}
delete mailbox.requests[pkgId];
var rpcDebugLog = mailbox.opts.rpcDebugLog;
var tracer = null;
var sendErr = null;
if (rpcDebugLog) {
tracer = new Tracer(mailbox.opts.rpcLogger, mailbox.opts.rpcDebugLog, mailbox.opts.clientId, pkg.source, pkg.resp, pkg.traceId, pkg.seqId);
}
var pkgResp = pkg.resp;
cb(tracer, sendErr, pkgResp);
};
var setCbTimeout = function(mailbox, id, tracer, cb) {
var timer = setTimeout(function() {
// logger.warn('rpc request is timeout, id: %s, host: %s, port: %s', id, mailbox.host, mailbox.port);
clearCbTimeout(mailbox, id);
if (mailbox.requests[id]) {
delete mailbox.requests[id];
}
var eMsg = util.format('rpc %s callback timeout %d, remote server %s host: %s, port: %s', mailbox.serverId, mailbox.timeoutValue, id, mailbox.host, mailbox.port);
logger.error(eMsg);
cb(tracer, new Error(eMsg));
}, mailbox.timeoutValue);
mailbox.timeout[id] = timer;
};
var clearCbTimeout = function(mailbox, id) {
if (!mailbox.timeout[id]) {
logger.warn('timer is not exsits, serverId: %s remote: %s, host: %s, port: %s', mailbox.serverId, id, mailbox.host, mailbox.port);
return;
}
clearTimeout(mailbox.timeout[id]);
delete mailbox.timeout[id];
};
/**
* Factory method to create mailbox
*
* @param {Object} server remote server info {id:"", host:"", port:""}
* @param {Object} opts construct parameters
* opts.bufferMsg {Boolean} msg should be buffered or send immediately.
* opts.interval {Boolean} msg queue flush interval if bufferMsg is true. default is 50 ms
*/
module.exports.create = function(server, opts) {
return new MailBox(server, opts || {});
};
|