Merge pull request #88 from telefonicaid/kevin/env-simulation

fix: setting .env variables on subservice

CHANGES_NEXT_RELEASE

@@ -0,0 +1 @@
+- Fix: per-directory .env files

bin/fiwareDeviceSimulatorCLI

@@ -37,7 +37,20 @@ var path = require('path');
 var request = require('request');
 var time = require('time');
 var deviceSimulator = require(ROOT_PATH + '/lib/fiwareDeviceSimulator');
-require('dotenv').config()
+
+require('dotenv').config({ path: getPathEnv() });
+
+/**
+ * Helper function to search and set .env path, setting root where it will be searched the .env file, this has to be at the same level as the simulation.json file
+ * @return {String}        .env Path
+ */
+function getPathEnv() {
+  const args = process.argv;
+  let simulationIndex = args.findIndex(item => item === '-c');
+  simulationIndex = args[simulationIndex + 1];
+  const path = simulationIndex.replace(/\/[a-zA-Z_-]+.json/g, '/.env');
+  return path;
+}
 
 /**
  * Array with the last 10 emitted errors

doc/manuals/simulation-configuration-file.md

@@ -523,6 +523,22 @@ Last but not least, the [`./examples`](https://github.com/telefonicaid/fiware-de
 The simulation configuration file may use an `.env` file to set configuration in the form of environment variables. This can be used to avoid setting
 sensitive information, and be executed in whatever environment, having different configurations and not been needed to change anything on code.
 
+Note that the `.env` file used by a given simulation file is the one that is located in the same directory where the simulation file is. For instance:
+
+``` tree
+├── electricvehicle         # Subservice directory (simulation has to have the same configuration)
+│   ├── .env                # Environment variables (just for the simulations in this directory)
+│   ├── simulation1.json    # simulation1.json tests
+│   └── simulation2.json    # simulation2.json tests
+│   └── ...
+├── bathwaters              # Subservice directory (simulation has to have the same configuration)
+│   ├── .env                # Environment variables (just for the simulations in this directory)
+│   ├── simulation1.json    # simulation1.json tests
+│   └── simulation2.json    # simulation2.json tests
+│   └── ...
+└── ...
+```
+
 Here's an example of `.env` file with the commonly environment variables used:
 
 ```