basic working socket-consumer modules with no handshaking but passing json objects

examples/client.mjs

@@ -0,0 +1,30 @@
+import Consumer from '../src/consumer'
+
+const USOCKET = '/opt/sockets/samplecs.sock'
+
+const socket1 = new Consumer(USOCKET)
+const socket2 = new Consumer(USOCKET)
+
+let packet1 = {name: 'socket1', cmd:'doit', data:'data sent by socket1'}
+let packet2 = {name: 'socket2', cmd:'doit', data:'data sent by socket2'}
+
+;
+(async () => {
+
+  await socket1.connect()
+  await socket2.connect()
+  await socket1.listen(app)
+  await socket2.listen(app)
+  socket1.send(packet1)
+  socket2.send(packet2)
+
+})().catch(err => {
+  console.error('FATAL: UNABLE TO START SYSTEM!\n',err)
+})
+
+
+//  This is your socket handler waiting on a message to do something
+function app (packet) {
+  console.log('incoming packet from socket to process')
+  console.dir(packet)
+}

examples/server.mjs

@@ -0,0 +1,36 @@
+import { Socket } from '../src'
+
+const USOCKET = '/opt/sockets/samplecs.sock'
+;
+(async () => {
+
+  class Test {
+    constructor() {
+      this.socket = new Socket(USOCKET)
+    }
+
+    async processPacket(packet) {
+      console.log('packet being processed')
+      console.dir(packet)
+      return await this[packet.cmd](packet.data,packet.name)
+    }
+
+    async doit(data,name) {
+      let res = {}
+      console.log('data:', data)
+      res.status ='success'
+      res.name = name
+      res.data = 'this would be response from device'
+      return(res)
+    }
+
+    init() { this.socket.create(this)}
+  }
+
+
+  let test = new Test()
+  await test.init()
+
+})().catch(err => {
+  console.error('FATAL: UNABLE TO START SYSTEM!\n',err)
+})

package.json

@@ -1,10 +1,17 @@
 {
-  "name": "@uci/esmtesting",
+  "name": "@uci/unix-socket",
   "version": "0.1.0",
-  "description": "Test for esm",
-  "main": "index.js",
+  "description": "Bare bones intra Host Unix Socket for basic IPC on same machine",
+  "main": "src",
   "scripts": {
-    "start": "node -r @std/esm test"
+    "test": "node -r @std/esm  test",
+    "testw": "./node_modules/.bin/nodemon -r @std/esm  test",
+    "s": "node -r @std/esm  examples/server",
+    "devs": "./node_modules/.bin/nodemon -r @std/esm -e mjs  examples/server",
+    "c": "node -r @std/esm  examples/client",
+    "cs": "node -r @std/esm  client-server",
+    "ms": "node -r @std/esm  mqtt-server",
+    "mc": "node -r @std/esm  mqtt-client"
   },
   "author": "David Kebler",
   "license": "MIT",
@@ -24,9 +31,12 @@
   "homepage": "https://github.com/uCOMmandIt/message#readme",
   "@std/esm": "cjs",
   "devDependencies": {
-    "@std/esm": "^0.18.0"
+    "@std/esm": "^0.18.0",
+    "nodemon": "^1.14.3"
   },
   "dependencies": {
-    "json-ipc-lib": "^1.0.2"
+    "better-try-catch": "^0.6.2",
+    "death": "^1.1.0",
+    "simple-node-logger": "^0.93.33"
   }
 }

readme.md

@@ -1,5 +1 @@
-## Native ESM Testing
-
-`npm start`
-
- esm module loader testing for module written with es modules but using .js as it was meant to be transpiled
+## Various Communication Protocol/Transport Testing

src/consumer.mjs

@@ -0,0 +1,43 @@
+import { Socket } from 'net'
+import btc from 'better-try-catch'
+
+export default class Consumer extends Socket {
+  constructor (path, opts={}) {
+    super()
+    this.path = path
+    this.keepAlive = opts.keepAlive ? opts.keepAlive : true
+  }
+
+  async connect () {
+
+    console.log('attempting to connect to socket: ', this.path)
+
+    await super.connect({ path: this.path })
+    console.log(`connected to ${this.path}`)
+    this.setKeepAlive(this.keepAlive)
+
+    this.on('error', (error) => {
+      'client socket error \n ', error.code
+    })
+
+  }
+
+  async send(packet) {
+    let [err, strbuf] = btc(JSON.stringify)(packet)
+    if (!err) {
+      this.write(strbuf)
+    }
+    else { console.log(`bad packet JSON syntax \n ${packet}`)}
+  }
+
+  async listen (app) {
+    this.on('data', async (buf) => {
+      let [err, packet] = btc(JSON.parse)(buf.toString())
+      if (!err) {
+        app(packet)
+      }
+      else { console.log(`bad packet JSON syntax \n ${buf.toString()}`)}
+    })
+  }
+
+}  // end class

src/index.mjs

@@ -0,0 +1,2 @@
+export { default as Socket } from './socket'
+export { default as Consumer } from  './consumer'

src/socket.mjs

@@ -0,0 +1,82 @@
+import { Server } from 'net'
+import { unlink as fileDelete } from 'fs'
+import btc from 'better-try-catch'
+import Logger from 'simple-node-logger'
+import ON_DEATH from 'death' //this is intentionally ugly
+
+let logger = {
+  logFilePath:'logfile.log',
+  timestampFormat:'YYYY-MM-DD HH:mm:ss.SSS'
+}
+
+export default class Socket extends Server {
+  constructor (path, opts={}) {
+    super()
+    this.path = path
+    this.logger = Logger.createSimpleLogger(opts.logger ?  opts.logger: logger)
+  } // end constructor
+
+
+  async create ( app ) {
+
+    this.on('error', async (err) => {
+      // recover from socket file that was not removed
+      if (err.code === 'EADDRINUSE') {
+        console.log(`socket path ${this.path} already exists...deleting`)
+        await fileDelete(this.path)
+        await this.listen(this.path)
+        return Promise.resolve(err.code)
+      }
+      // otherwise fatally exit
+      console.log('error creating socket: ',err.code)
+      return Promise.reject(err.code)
+    })
+
+    //
+    this.on('listening', async () => {
+      console.log(`socket created at ${this.path}`)
+
+      // this gets called for each client connection and is unique to each
+      this.on('connection', (socket) => {
+        console.log('new consumer connected')
+
+        socket.on('data', async (buf) => {
+          let [err, packet] = btc(JSON.parse)(buf.toString())
+          if (!err) {
+            this.logger.info(`data packet received to socket \n ${packet}`)
+            socket.write(JSON.stringify(await app.processPacket.bind(app)(packet)))
+          }
+          else { console.log(`bad packet JSON syntax \n ${buf.toString()}`)}
+
+        }) // end incoming data listerner
+
+      }) // end connected consumer
+    }) // end socket listening listener
+
+    // start it
+    await this.listen(this.path)
+
+    // if socket is terminated then shutdown gracefully
+    ON_DEATH( async () => {
+      await this.destroy()
+    })
+
+    process.once('SIGUSR2', async () => {
+      await this.destroy
+      process.kill(process.pid, 'SIGUSR2')
+
+    })
+
+  } // end create
+
+  async destroy () {
+
+    console.log('\nclosing down socket')
+    await this.close()
+    console.log('\n all connections closed....exiting')
+    process.exit()
+
+  } // end destroy
+
+
+} // end class

test.mjs

@@ -1,12 +0,0 @@
-import ipc from 'json-ipc-lib/src'
-
-console.log('clinet\n',[...getAllMethodNames(new ipc.client )])
-
-function getAllMethodNames(obj) {
-  let methods = new Set()
-  while (obj = Reflect.getPrototypeOf(obj)) {
-    let keys = Reflect.ownKeys(obj)
-    keys.forEach((k) => methods.add(k))
-  }
-  return methods
-}