Function: Simple Timer

Enterprise Edition

Goal: Create a Simple Timer that triggers in the future on each mutation.

This function simpleTimer merely demonstrates a basic Evening Timer.
Requires Eventing Storage (or metadata collection) and a "source" collection.
Will operate on any mutation where the KEY or meta.id starts with "simpletimer:".
The result of processing the mutation is a Timer that will be executed approximately 30 seconds in the future.
For more details on Timers refer to Timers.
For an example of a recurring Timer refer to: Recurring Timer.

simpleTimer
Input Data/Mutation
Output Data/Logged

// To run configure the settings for this Function, simpleTimer, as follows:
//
// Version 7.0+
//   "Listen to Location"
//     bulk.data.source
//   "Eventing Storage"
//     rr100.eventing.metadata
//   Binding(s) - none
//
// Version 6.X
//   "Source Bucket"
//     source
//   "MetaData Bucket"
//     metadata
//   Binding(s) - none

function TimerCallback(context) {
    log('From TimerCallback: timer fired with context', context);
    // do any sort of recurring work here, just update a date_stamp in a doc
}

function OnUpdate(doc, meta) {
    // You would typically filter to mutations of interest
    if (! meta.id.startsWith("simpletimer:")) return;

    // Make a Date 30 seconds in the future
    var thirtySecFromNow = new Date(); // Get current time & add 30 sec. to it.
    thirtySecFromNow.setSeconds(thirtySecFromNow.getSeconds() + 30);

    // Timers require an id
    var timer_id = meta.id;
    // Timers can access a context when they fire
    var context = {"id": meta.id, "random": Math.random(), "sched": thirtySecFromNow, doc: doc}

    // crate the Timer
    createTimer(TimerCallback, thirtySecFromNow, timer_id, context);
    log("From OnUpdate createTimer(TimerCallback, "+thirtySecFromNow+","+ timer_id+",", context);
}

INPUT: KEY simpletimer:1

{
  "id": 1,
  "type": "simpletimer",
  "data": "ABCDEFG"
}

2021-07-18T19:47:53.842-07:00 [INFO] "From TimerCallback: timer fired with context" {"id":"simpletimer:1","random":0.9470436283584234,"sched":"2021-07-19T02:47:48.405Z","doc":{"id":1,"type":"simpletimer","data":"ABCDEFG"}}

2021-07-18T19:47:18.407-07:00 [INFO] "From OnUpdate createTimer(TimerCallback, Sun Jul 18 2021 19:47:48 GMT-0700 (Pacific Daylight Time),simpletimer:1," {"id":"simpletimer:1","random":0.9470436283584234,"sched":"2021-07-19T02:47:48.405Z","doc":{"id":1,"type":"simpletimer","data":"ABCDEFG"}}