83 lines
2.2 KiB
JavaScript
83 lines
2.2 KiB
JavaScript
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import { Server } from 'net'
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import { unlink as fileDelete } from 'fs'
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import btc from 'better-try-catch'
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import Logger from 'simple-node-logger'
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import ON_DEATH from 'death' //this is intentionally ugly
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let logger = {
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logFilePath:'logfile.log',
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timestampFormat:'YYYY-MM-DD HH:mm:ss.SSS'
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}
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export default class Socket extends Server {
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constructor (path, opts={}) {
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super()
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this.path = path
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this.logger = Logger.createSimpleLogger(opts.logger ? opts.logger: logger)
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} // end constructor
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async create ( app ) {
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this.on('error', async (err) => {
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// recover from socket file that was not removed
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if (err.code === 'EADDRINUSE') {
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console.log(`socket path ${this.path} already exists...deleting`)
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await fileDelete(this.path)
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await this.listen(this.path)
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return Promise.resolve(err.code)
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}
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// otherwise fatally exit
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console.log('error creating socket: ',err.code)
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return Promise.reject(err.code)
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})
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//
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this.on('listening', async () => {
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console.log(`socket created at ${this.path}`)
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// this gets called for each client connection and is unique to each
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this.on('connection', (socket) => {
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console.log('new consumer connected')
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socket.on('data', async (buf) => {
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let [err, packet] = btc(JSON.parse)(buf.toString())
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if (!err) {
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this.logger.info(`data packet received to socket \n ${packet}`)
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socket.write(JSON.stringify(await app.processPacket.bind(app)(packet)))
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}
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else { console.log(`bad packet JSON syntax \n ${buf.toString()}`)}
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}) // end incoming data listerner
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}) // end connected consumer
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}) // end socket listening listener
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// start it
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await this.listen(this.path)
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// if socket is terminated then shutdown gracefully
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ON_DEATH( async () => {
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await this.destroy()
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})
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process.once('SIGUSR2', async () => {
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await this.destroy
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process.kill(process.pid, 'SIGUSR2')
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})
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} // end create
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async destroy () {
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console.log('\nclosing down socket')
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await this.close()
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console.log('\n all connections closed....exiting')
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process.exit()
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} // end destroy
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} // end class
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