A node js script for populating a cgm-remote-monitor database with test data

populate.js

'use strict';

///////////////////////////////////////////////////
// DB Connection setup and utils
///////////////////////////////////////////////////

var mongodb  = require('mongodb');
var software = require('./package.json');
var env      = require('./env')( );

main();

function main( ) {

    var MongoClient = mongodb.MongoClient;
    
    MongoClient.connect(env.mongo, function connected (err, db) {

	console.log("Connected to mongo, ERROR: %j", err);
	if (err) { throw err; }	
	populate_collection( db );

    });

}

function populate_collection( db ) {

    //console.log( 'mongo = ' + env.mongo );
    //console.log( 'collection = ' + env.mongo_collection );

    var cgm_collection = db.collection( env.mongo_collection );

    var new_cgm_record = get_cgm_record();

    cgm_collection.insert( new_cgm_record, function(err,created) { 

	// TODO: Error checking
	process.exit( 0 );

    } );


}

function get_cgm_record( ) {

    var dateobj = new Date();
    var datemil = dateobj.getTime();
    var datesec = datemil / 1000;
    var datestr = getDateString( dateobj );
    
    // We put the time in a range from -1 to +1 for every thiry minute period
    var range = (datesec % 1800)/900 - 1.0;
    
    // The we push through a COS function and scale between 40 and 400 (so it is like a bg level)
    var sgv   = Math.floor(360*(Math.cos( 10.0 * range / 3.14 ) / 2 + 0.5)) + 40;
    var dir   = range > 0.0 ? "FortyFiveDown" : "FortyFiveUp";
    
    console.log( 'Writing Record: ');
    console.log( 'sgv  = ' + sgv );
    console.log( 'date = ' + datemil );
    console.log( 'dir  = ' + dir );
    console.log( 'str  = ' + datestr );
    
    var mondo_db = null;
    var doc = { 'device'      :'dexcom' ,
	         'date'       : datemil ,
		 'sgv'        : sgv     ,
	         'direction'  : dir     ,
		 'dateString' : datestr }; 


    return doc;
}

function getDateString( d ) {

    // How I wish js had strftime. This would be one line of code!

    var month = d.getMonth();
    var day   = d.getDay();
    var year  = d.getFullYear();

    if (month < 10 ) month = '0'+month;
    if (day < 10 ) day = '0'+day;

    var hour = d.getHours();
    var min  = d.getMinutes();
    var sec  = d.getSeconds();
    
    var ampm = 'PM';

    if (hour < 12)
    {
	ampm = "AM";
    }
    else
    {
	ampm = "PM";
    }

    if (hour == 0)
    {
	hour = 12;
    }
    if (hour > 12)
    {
	hour = hour - 12;
    }

    if (hour < 10) hour = '0' + hour;
    if (min  < 10) min  = '0' + min;
    if (sec  < 10) sec  = '0' + sec;

    return month + '/' + day + '/' + year + ' ' + hour + ':' + min + ':' + sec + ' ' + ampm; 

}