Read config from env instead of file

.gitignore

@@ -1,2 +1 @@
-config.js
 node_modules/

README.md

@@ -17,12 +17,26 @@
 
 1. Install [Node].
 1. Clone this repository or [download a zip] with the latest version.
-1. Create a `config.js` file based on the provided `config.js.example`.
 1. `npm install` to install dependencies.
+1. Set environment variables (see below).
 1. `npm start` and leave it running.
 
 **Coming soon:** Deploy instructions for Heroku
 
+### Required environment variables
+
+* `CARELINK_USERNAME` - your username for [CareLink][carelink]
+* `CARELINK_PASSWORD` - your password for [CareLink][carelink]
+* `CARELINK_PUMP_TIMEZONE` - a timezone offset string like `"-0700"` which represents the pump's offset from UTC (**TODO:** use time zone names like `America/Los_Angeles` instead, since offsets vary depending on DST)
+* `API_SECRET` - the value you use for `API_SECRET` on your Nightscout website
+* `WEBSITE_HOSTNAME` - the hostname for your Nightscout instance, which looks like `your.host.com`. If you are running this script in the same Azure environment as Nightscout, there is no need to set this, as it will [already be set by Azure][azure-environment]. If you set `NS` (see below), you do not need to set this.
+
+### Optional environment variables
+
+* `CARELINK_REQUEST_INTERVAL` - number of milliseconds to wait between requests to the CareLink server (default: 60000)
+* `CARELINK_SGV_LIMIT` - maximum number of recent sensor glucose values to send to Nightscout (default: 24)
+* `NS` - a fully-qualified Nightscout URL (e.g. `https://sitename.azurewebsites.net`) which overrides `WEBSITE_HOSTNAME`
+
 ## Currently supported data
 
 * Sensor glucose values
@@ -49,6 +63,7 @@ This project is intended for educational and informational purposes only. It rel
 [cgm-remote-monitor]: https://github.com/nightscout/cgm-remote-monitor
 [Node]: https://nodejs.org
 [download a zip]: https://github.com/mddub/minimed-connect-to-nightscout/archive/master.zip
+[azure-environment]: https://github.com/projectkudu/kudu/wiki/Azure-runtime-environment
 [this sensor-disabled gist]: https://gist.github.com/mddub/b033ec0c800deec02471
 [this sensor-enabled gist]: https://gist.github.com/mddub/dc1baf74eda772dcb164
 [get in touch]: mailto:mark@warkmilson.com

logger.js

@@ -2,7 +2,7 @@
 "use strict";
 
 module.exports.log = function(str) {
-  if (process.env['MINIMED_CONNECT_VERBOSE']) {
+  if (process.env['CARELINK_VERBOSE']) {
     console.log(new Date() + ' ' + str);
   }
 };

package.json

@@ -12,7 +12,7 @@
   },
   "main": "index.js",
   "scripts": {
-    "start": "MINIMED_CONNECT_VERBOSE=true node run.js"
+    "start": "CARELINK_VERBOSE=true node run.js"
   },
   "license": "MIT",
   "dependencies": {

run.js

@@ -1,19 +1,38 @@
 /* jshint node: true */
 "use strict";
 
-var config = require('./config'),
-  carelink = require('./carelink'),
+var carelink = require('./carelink'),
   nightscout = require('./nightscout');
 
-var client = carelink.Client({username: config.CARELINK_USERNAME, password: config.CARELINK_PASSWORD}),
-  endpoint = config.NIGHTSCOUT_HOST + '/api/v1/entries.json',
-  secret = config.NIGHTSCOUT_API_SECRET;
+function readEnv(key, defaultVal) {
+  var val = process.env[key] ||
+    process.env[key.toLowerCase()] ||
+    // Azure prefixes environment variables with this
+    process.env['CUSTOMCONNSTR_' + key] ||
+    process.env['CUSTOMCONNSTR_' + key.toLowerCase()];
+  return val !== undefined ? val : defaultVal;
+}
+
+var config = {
+  username: readEnv('CARELINK_USERNAME'),
+  password: readEnv('CARELINK_PASSWORD'),
+  pumpTimezone: readEnv('CARELINK_PUMP_TIMEZONE'),
+  nsHost: readEnv('WEBSITE_HOSTNAME'),
+  nsBaseUrl: readEnv('NS'),
+  nsSecret: readEnv('API_SECRET'),
+  interval: parseInt(readEnv('CARELINK_REQUEST_INTERVAL', 60 * 1000)),
+  sgvLimit: parseInt(readEnv('CARELINK_SGV_LIMIT', 24))
+};
+
+var client = carelink.Client({username: config.username, password: config.password});
+
+var endpoint = (config.nsBaseUrl ? config.nsBaseUrl : 'https://' + config.nsHost) + '/api/v1/entries.json';
 
 (function requestLoop() {
   client.fetch(function(data) {
-    var entries = nightscout.transform(data, config.PUMP_TIMEZONE, config.NUM_RECORDS_TO_SUBMIT);
-    nightscout.upload(entries, endpoint, secret, function(response) {
-      setTimeout(requestLoop, config.CARELINK_REQUEST_INTERVAL);
+    var entries = nightscout.transform(data, config.pumpTimezone, config.sgvLimit);
+    nightscout.upload(entries, endpoint, config.nsSecret, function(response) {
+      setTimeout(requestLoop, config.interval);
     });
   });
 })();