114 lines
3.5 KiB
JavaScript
114 lines
3.5 KiB
JavaScript
import { Server } from 'net'
|
|
import { unlink as fileDelete } from 'fs'
|
|
import btc from 'better-try-catch'
|
|
import _ON_DEATH from 'death' //this is intentionally ugly
|
|
import JSONStream from './json-stream'
|
|
|
|
import logger from '../../uci-logger/src/logger'
|
|
let log = {}
|
|
const LOG_OPTS = {
|
|
repo:'uci-socket',
|
|
npm:'@uci/socket',
|
|
file:'src/socket.mjs',
|
|
class:'Socket',
|
|
id:this.id,
|
|
instance_created:new Date().getTime()
|
|
}
|
|
const DEFAULT_PIPE = (process.env.SOCKETS_DIR || __dirname) + '/uci-socket.sock'
|
|
|
|
export default class Socket extends Server {
|
|
constructor (opts={}) {
|
|
super()
|
|
this.id = opts.id || opts.name || 'socket:'+ new Date().getTime()
|
|
if (!opts.path && opts.np) opts.path = DEFAULT_PIPE
|
|
if (!opts.path) {
|
|
opts.host = opts.host || '0.0.0.0'
|
|
opts.port = opts.port || 8080
|
|
} else opts.np = true
|
|
this.opts = opts
|
|
//self bindings
|
|
this._listen = this._listen.bind(this)
|
|
this.create = this.create.bind(this)
|
|
log = logger.child(LOG_OPTS) //create instance logger set LOG_OPTS above
|
|
|
|
} // end constructor
|
|
|
|
async create () {
|
|
|
|
return new Promise( async (resolve,reject) => {
|
|
// couple ways to kill socket process when needed
|
|
_ON_DEATH( async () => {
|
|
log.info('\nhe\'s dead jim')
|
|
await this._destroy()
|
|
})
|
|
process.once('SIGUSR2', async () => {
|
|
await this._destroy
|
|
process.kill(process.pid, 'SIGUSR2')
|
|
})
|
|
|
|
this.on('error', async (err) => {
|
|
// recover from socket file that was not removed
|
|
if (err.code === 'EADDRINUSE') {
|
|
if (this.opts.np) { // if TCP socket should already be dead
|
|
log.info({socket: this.opts.path}, 'already exists...deleting')
|
|
await fileDelete(this.opts.path)
|
|
return await this._listen(this.opts)
|
|
}
|
|
}
|
|
// otherwise fatally exit
|
|
log.info(err, 'creating socket')
|
|
reject(err)
|
|
})
|
|
|
|
let [err, res] = await btc(this._listen)(this.opts)
|
|
if (err) reject(err)
|
|
resolve(res)
|
|
|
|
}) // end creeate promise
|
|
} // end create
|
|
|
|
|
|
registerPacketProcessor (func) {
|
|
this._packetProcess = func
|
|
}
|
|
|
|
async _listen (opts) {
|
|
super.listen(opts, async (err, res) => {
|
|
if (err) return err
|
|
// this gets called for each client connection and is unique to each
|
|
this.on('connection', async (socket) => {
|
|
const stream = new JSONStream()
|
|
log.info('new consumer connecting sending handshake')
|
|
socket.write(await stream.serialize({'_handshake':true}))
|
|
socket.on('data', stream.onData)
|
|
// TODO need to start error listener for stream so errors can be processed
|
|
stream.on('message', messageProcess.bind(this))
|
|
async function messageProcess (packet) {
|
|
// console.log('before processing',packet)
|
|
let processed = await this._packetProcess(packet)
|
|
if (!processed) processed = { error: 'packet command function likely did not return a promise', packet:packet}
|
|
// console.log('after processing',processed)
|
|
socket.write(await stream.serialize(processed))
|
|
}
|
|
}) // end connecttion consumer
|
|
log.info({opts: this.opts},'socket created')
|
|
return res
|
|
}) // end super listen callback
|
|
|
|
} // end listen
|
|
|
|
async _destroy () {
|
|
log.info('closing down socket')
|
|
await this.close()
|
|
log.info('all connections closed....exiting')
|
|
process.exit()
|
|
}
|
|
|
|
// default packet process, just a simple echo
|
|
_packetProcess (packet) {
|
|
packet.res='echoed'
|
|
return packet
|
|
}
|
|
|
|
} // end class
|