From bba5bb85ca41d998ed152fc7615ac39510268318 Mon Sep 17 00:00:00 2001
From: David Kebler <d@kebler.net>
Date: Tue, 27 Feb 2018 08:42:37 -0800
Subject: [PATCH] refactoring to single interrupt with it's own socket/port and
 separate module for multiple interrupts Added optional debounce

---
 src/interrupt.mjs | 115 ++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 115 insertions(+)
 create mode 100644 src/interrupt.mjs

diff --git a/src/interrupt.mjs b/src/interrupt.mjs
new file mode 100644
index 0000000..f3a499e
--- /dev/null
+++ b/src/interrupt.mjs
@@ -0,0 +1,115 @@
+import bus, { Gpio } from 'pigpio'
+// import bus, { Gpio } from 'pigpio-mock'
+// import btc from 'better-try-catch'
+import debounce from 'lodash.debounce'
+// import throttle from 'lodash.throttle'
+// import debounce from 'debounce-fn'
+import Base from '@uci/base'
+
+import logger from '@uci/logger'
+let log = {}
+const LOG_OPTS = (id) => {
+  return {
+    repo:'uci-interrupt',
+    npm:'@uci/interrupt',
+    file:'src/interrupt.mjs',
+    class:'Interrupt',
+    id:id,
+    instance_created:new Date().getTime()
+  }}
+
+export default class Interrupt extends Base {
+  constructor(pin,opts={}) {
+
+    opts.sockets = opts.sockets ? (opts.sockets + ',') : ''
+    opts.itrt = opts.itrt || {}
+    if (opts.itrt || opts.host) {
+      opts.itrt.host = opts.host || opts.itrt.host
+      if (opts.itrt.host) {
+        opts.itrt.port =   opts.itrt.port || opts.port || 9000+pin
+        opts.sockets = opts.sockets + 'itrt#c>t'
+      }
+    }
+    if (opts.path  || opts.itrn || !opts.itrt.host) {
+      opts.itrn = opts.itrn || {}
+      opts.itrn.path = opts.path || opts.itrn.path || 'interrupt:'+ pin
+      opts.sockets = opts.sockets + 'itrn#c>n'
+    }
+    if (opts.sockets==='') throw ('must have at least one socket client')
+    super(opts)
+    console.dir(opts)
+    log = logger.child(LOG_OPTS(this.id))
+    log.info({pins:pin, opts:opts},'created interrupt with these opts')
+    this.pin_num = pin
+    this.mock = opts.mockG
+    this.wait = opts.wait || 0
+    this.dbopts = { maxWait:opts.maxwait || 300, leading: opts.leading || true, trailing:opts.trailing || false}
+    this.edge = opts.edge || Gpio.RISING_EDGE
+    this.pin = new Gpio(
+      pin, {
+        mode: Gpio.INPUT,
+        pullUpDown: opts.pull || Gpio.PUD_DOWN
+        // do not! set edge here as it will start the emitter -- see pigio js
+      })
+    this.packet = opts.packet || {}
+    this.packet.pin = pin
+    this.packet.cmd = this.packet.cmd || 'interrupt'
+    this.packet.count = 0
+
+
+  }  // end constructor
+
+
+  async init(){
+    await super.init()
+    // for cntrl-c exit of interrupt
+    process.on('SIGINT', () => {
+      this.exit().then((resp) => console.log('\n', resp)) // unexport on cntrl-c
+        .catch(err => console.log('error:', err))
+    })
+
+    // const pinDebounce = function (processor, wait, options, packet) {
+    //   console.log(processor,wait,options,packet)
+    //   return debounce.bind(this,processor.bind(this,packet),wait, options)
+    // return debounce.bind(processor.bind(this,packet),wait)
+    // return debounce.bind(null,processor,{ wait:wait})
+    // }
+
+    console.log(`starting interrupt on pin ${this.pin_num} with debounce wait/max:${this.wait},${this.maxwait} (0=off)`)
+    let cb = () => {}
+    if (this.wait===0) cb = this.interruptProcess.bind(this,this.packet)
+    // else cb = pinDebounce(this.interruptProcess,this.wait,this.dbopts,this.packet)
+    // else cb = debounce(()=>{console.log('debounced')},this.wait,this.dbopts)
+    else cb = debounce(this.interruptProcess.bind(this,this.packet),this.wait,this.dbopts)
+    this.pin.on('interrupt',cb)
+    // rock n roll!!, start the pigpio interrupt
+    if(!this.mock) this.pin.enableInterrupt(this.edge)
+  }
+
+
+  // manual firing for testing
+  fire() {
+    console.log('manually firing interrupt for pin', this.pin_num)
+    this.pin.emit('interrupt',1)
+  }
+
+  exit() {
+    bus.terminate()
+    return Promise.reject('keyboard termination...terminating interrupts')
+  }
+
+  // default processor
+  interruptProcess (packet) {
+    packet.count += 1
+    packet.time = new Date().getTime()
+    console.log('=======================')
+    console.log(`pin ${packet.pin} on sbc gpio bus has thrown an interrupt`)
+    console.log('sending to all connected sockets with default cmd:"interrupt"')
+    console.dir(packet)
+    this.send(packet)
+    console.log('this is the default processor')
+    console.log('replace "interruptProcess" for your instance or extended class')
+    console.log('=======================')
+  }
+
+} // end Class