Added support to decoding build errors.

Author: dannyhp1

executor/executor_server.py

@@ -22,9 +22,10 @@ def execute():
   # Call executor_utils to run code.
   print('API called with code %s in %s.' % (code, language))
   result = eu.build_and_execute(code, language)
+  print(result)
 
   return jsonify({
-    'build': str(result['build']),
+    'build': 'Compiled successfully!' if result['build'] == True else result['build'].decode('utf-8'),
     'run': str(result['run']) if result['run'] is None else result['run'].decode('utf-8'),
     'error': str(result['error'])
   })

executor/executor_utils.py

@@ -73,7 +73,7 @@ def build_and_execute(code, language):
       working_dir=source_file_guest_directory
     )
     print('Source built!')
-    result['build'] = 'Compiled successfully!'
+    result['build'] = True
   except ContainerError as e:
     print('Build failed!')
     result['build'] = e.stderr