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| module.exports = Slocket
var rimraf = require('rimraf')
var assert = require('assert')
var net = require('net')
var fs = require('fs')
var path = require('path')
var onExit = require('signal-exit')
var locks = Object.create(null)
/* istanbul ignore if */
if (typeof Promise === undefined)
Promise = require('bluebird')
var util = require('util')
util.inherits(Slocket, Promise)
var debug = function () {}
/* istanbul ignore if */
if (/\bslocket\b/i.test(process.env.NODE_DEBUG || '')) {
debug = function () {
var msg = util.format.apply(util, arguments)
var n = path.basename(this.name)
var p = 'SLOCKET:' + process.pid + ':' + n + ' '
msg = p + msg.trimRight().split('\n').join('\n' + p)
console.error(msg)
}
}
function Slocket (name, cb) {
if (!(this instanceof Slocket))
return new Slocket(name, cb)
this.name = path.resolve(name)
if (cb)
this.cb = cb
this.server = null
this.connection = null
this.watcher = null
this.has = false
this.had = false
this.acquire()
this.connectionQueue = []
this.currentClient = null
this.promise = new Promise(function (resolve, reject) {
this.resolve = resolve
this.reject = reject
}.bind(this))
this.then = this.promise.then.bind(this.promise)
this.catch = this.promise.catch.bind(this.promise)
}
Slocket.prototype.debug = debug
Slocket.prototype.cb = function () {}
Slocket.prototype.acquire = function () {
this.unwatch()
this.disconnect()
this.server = net.createServer(this.onServerConnection.bind(this))
this.server.once('error', this.onServerError.bind(this))
this.server.listen(this.name, this.onServerListen.bind(this))
this.server.on('close', this.onServerClose.bind(this))
}
Slocket.prototype.onAcquire = function () {
this.unwatch()
assert.equal(this.has, false)
this.has = true
this.had = true
this.cb(null, this)
// Promises are sometimes a little clever
// when you resolve(<Promise>), it hooks onto the .then method
// of the promise it's resolving to. To avoid never actually
// resolving, we wrap to hide the then/catch methods.
this.resolve(Object.create(this, {
then: { value: undefined },
catch: { value: undefined },
resolve: { value: undefined },
reject: { value: undefined },
release: { value: this.release.bind(this) }
}))
}
Slocket.prototype.onServerListen = function () {
process.nextTick(function () {
this.debug('onServerListen', this.server.listening)
onExit(this.onProcessExit.bind(this))
this.onAcquire()
}.bind(this))
}
Slocket.prototype.onProcessExit = function () {
Iif (this.has === true)
this.release(true)
}
Slocket.prototype.onServerConnection = function (c) {
c.on('close', this.onServerConnectionClose.bind(this, c))
Eif (this.currentClient || this.has)
this.connectionQueue.push(c)
else
this.delegate(c)
}
Slocket.prototype.onServerConnectionClose = function (c) {
this.debug('onServerConnectionClose', this.has)
Eif (this.currentClient === c) {
this.currentClient = null
this.release()
}
var i = this.connectionQueue.indexOf(c)
Iif (i !== -1)
this.connectionQueue.splice(i, 1)
}
Slocket.prototype.delegate = function (c) {
assert.equal(this.has, false)
this.debug('delegate new client')
this.currentClient = c
c.write('OK')
}
Slocket.prototype.type = function () {
return !this.has ? 'none'
: this.server && this.server.listening ? 'server'
: this.connection ? 'connection'
: 'wtf'
}
Slocket.prototype.release = function (sync) {
this.has = false
this.debug('release')
this.connectionRelease(sync)
this.serverRelease(sync)
}
Slocket.prototype.serverRelease = function (sync) {
if (!this.server)
return
this.debug('serverRelease %j', sync, this.connectionQueue.length)
this.server.unref()
if (this.connectionQueue.length)
this.delegate(this.connectionQueue.shift())
else
this.server.close()
}
Slocket.prototype.onServerClose = function () {
this.server = null
}
Slocket.prototype.onServerError = function (er) {
this.debug('onServerError', er.message)
// XXX just in the off chance this happens later, kill any connections
// and destroy the server
Eif (this.server)
this.server.close()
this.server = null
switch (er.code) {
case 'ENOTSOCK':
return this.watch()
case 'EADDRINUSE':
case 'EEXIST':
return this.connect()
default:
er.slocket = 'server'
this.onError(er)
}
}
Slocket.prototype.onError = function (er) {
this.cb(er, this)
this.reject(er)
}
Slocket.prototype.connect = function () {
this.connection = net.createConnection(this.name)
this.connection.slocketBuffer = ''
this.connection.setEncoding('utf8')
this.connection.slocketConnected = false
this.connection.on('connect', this.onConnect.bind(this))
this.connection.on('error', this.onConnectionError.bind(this))
this.connection.on('data', this.onConnectionData.bind(this))
}
Slocket.prototype.onConnectionData = function (chunk) {
this.connection.slocketBuffer += chunk
Eif (this.connection.slocketBuffer === 'OK')
this.onAcquire()
Iif (this.connection.slocketBuffer.length > 2)
this.connection.destroy()
}
Slocket.prototype.onConnectionError = function (er) {
Iif (this.has)
return this.onError(er)
this.connection = null
switch (er.code) {
case 'ENOENT':
// socket was there, but now is gone!
return this.acquire()
case 'ECONNREFUSED':
// socket there, but not listening
// watch for changes, in case it's that it's not a socket
// if that fails, eg for "unknown system error", then just retry
try {
return this.watch()
} catch (er) {
return this.acquire()
}
default:
er.slocket = 'connection'
this.onError(er)
}
}
Slocket.prototype.onConnect = function () {
this.connection.slocketConnected = true
this.connection.on('close', this.onConnectionClose.bind(this))
}
Slocket.prototype.onConnectionClose = function () {
this.connection.slocketConnected = false
if (!this.had)
this.acquire()
}
Slocket.prototype.connectionRelease = function (sync) {
if (!this.connection)
return
Eif (this.connection.slocketConnected)
this.connection.destroy()
else if (sync)
rimraf.sync(this.name)
else
rimraf(this.name, function () {})
}
Slocket.prototype.disconnect = function () {
if (this.connection)
this.connection.destroy()
this.connection = null
}
Slocket.prototype.watch = function () {
this.watcher = fs.watch(this.name, { persistent: false })
this.watcher.on('change', this.acquire.bind(this))
this.watch.on('error', this.acquire.bind(this))
}
Slocket.prototype.unwatch = function () {
Iif (this.watcher)
this.watcher.close()
this.watcher = null
}
|