From 616f6b06d2216b7cffe274bba09d867dcbd439f1 Mon Sep 17 00:00:00 2001
From: Clovis Durand <cd.clovel19@gmail.com>
Date: Fri, 10 Apr 2020 17:30:36 +0200
Subject: [PATCH] [#1] Can now launch the C++ back-end from the electron app

Signed-off-by: Clovis Durand <cd.clovel19@gmail.com>
---
 app/back/backEndLauncher.js | 57 ++++++++++++++++++++++++++++++++-----
 app/back/ipcBack.js         |  3 ++
 app/config.json             |  3 +-
 3 files changed, 55 insertions(+), 8 deletions(-)

diff --git a/app/back/backEndLauncher.js b/app/back/backEndLauncher.js
index 3f6e3e3..95c9091 100644
--- a/app/back/backEndLauncher.js
+++ b/app/back/backEndLauncher.js
@@ -1,15 +1,58 @@
 const child  = require('child_process');
-const config = require('../config.json')
+const fs     = require('fs');
 
 /* Set the back-end's path */
-const backEnd     = config.backEnd;
-const backEndPort = config.backEndPort;
-const edsFile     = config.edsFile;
+
+let backEnd;
 
 function launchBackEnd() {
+    let backEnd;
+    let backEndLibDir;
+    let backEndPort;
+    let edsFile;
+
+    lConfig = JSON.parse(fs.readFileSync('./app/config.json', 'utf8'));
+
+    /* Set the configuration variables */
+    backEndExe    = lConfig.backEndExe;
+    backEndPort   = lConfig.backEndPort;
+    backEndLibDir = lConfig.backEndLibDir;
+    edsFile       = lConfig.odFileName;
+
+
+    console.log('backEndExe       : ' + backEndExe       + ' (' + typeof(backEndExe) + ')');
+    console.log('backEndLibDir : ' + backEndLibDir + ' (' + typeof(backEndLibDir) + ')');
+    console.log('backEndPort   : ' + backEndPort   + ' (' + typeof(backEndPort) + ')');
+    console.log('edsFile       : ' + edsFile       + ' (' + typeof(edsFile) + ')');
+
+    var lEnv = Object.create(process.env);
+    lEnv.LD_LIBRARY_PATH = backEndLibDir;
+
     var lParameters = [backEndPort, edsFile];
-    child.execFile(backEnd, lParameters, function(err, data) {
-        console.log(err);
-        console.log(data.toString());
+    console.log('[INFO ] Launching back-end :' + backEndExe + ' ' + backEndPort + ' ' + edsFile);
+    backEnd = child.spawn(backEndExe, lParameters, { env: lEnv }, function(error, stdout, stderr) {
+        if(error) {
+            console.log(error);
+            return;
+        }
+
+        console.log(stdout);
+        console.log(stderr);
+    });
+
+    backEnd.stdout.on('data', function(data) {
+        console.log('[B-END] stdout: ' + data.toString('utf-8'));
+    });
+    
+    backEnd.stderr.on('data', function(data) {
+        console.log('[B-END] stderr: ' + data.toString('utf8'));
     });
+    
+    backEnd.on('exit', function(code) {
+        console.log('[B-END] child process exited with code ' + code.toString('utf-8'));
+    });
+
+    return;
 }
+
+module.exports.launchBackEnd = launchBackEnd;
diff --git a/app/back/ipcBack.js b/app/back/ipcBack.js
index 09c5abe..e87dde6 100644
--- a/app/back/ipcBack.js
+++ b/app/back/ipcBack.js
@@ -1,7 +1,10 @@
 const {ipcMain} = require('electron')
+const backEndLauncher = require('./backEndLauncher')
 
 ipcMain.on('test-button-signal', () => {
     console.log('[DEBUG] IPC signal received by main process');
+    console.log('        Launching back-end');
+    backEndLauncher.launchBackEnd();
 });
 
 ipcMain.on('methodCall', async (event, { method, callId, args }) => {
diff --git a/app/config.json b/app/config.json
index b1a2772..e2cfe03 100644
--- a/app/config.json
+++ b/app/config.json
@@ -1,6 +1,7 @@
 {
     "backEndExe": "/Users/clovel/repository/CAN-CANOpen/OSCO-OD-Gen/generator/dest/bin/OSCO-OD-Gen-util",
-    "odFileName": "/Users/clovel/repository/CAN-CANOpen/OSCO-OD-Gen/generator/example/od/IO.eds",
+    "backEndLibDir": "/Users/clovel/repository/CAN-CANOpen/OSCO-OD-Gen/generator/dest/lib",
+    "odFileName": "/Users/clovel/repository/CAN-CANOpen/OSCO-OD-Gen/generator/examples/od/IO.eds",
     "backEndPort": 3000,
     "backEndAddr": "http://localhost"
 }
\ No newline at end of file