refactor: API now rely on gnpy function without re-implementation

Change-Id: Ib71f62f74eaa9fd87606a977f1f2c830b71668d9

gnpyapi/core/exception/exception_handler.py

@@ -0,0 +1,34 @@
+# coding: utf-8
+import json
+import re
+
+import werkzeug
+
+from gnpyapi.core.model.error import Error
+
+_reaesc = re.compile(r'\x1b[^m]*m')
+
+
+def common_error_handler(exception):
+    """
+
+    :type exception: Exception
+
+    """
+    status_code = 500
+    if not isinstance(exception, werkzeug.exceptions.HTTPException):
+        exception = werkzeug.exceptions.InternalServerError()
+        exception.description = "Something went wrong on our side."
+    else:
+        status_code = exception.code
+    response = Error(message=exception.name, description=exception.description,
+                     code=status_code)
+
+    return werkzeug.Response(response=json.dumps(response.__dict__), status=status_code, mimetype='application/json')
+
+
+def bad_request_handler(exception):
+    exception_str = " ".join(str(exception).split())
+    response = Error(message='bad request', description=_reaesc.sub('', exception_str.replace("\n", " ")),
+                     code=400)
+    return werkzeug.Response(response=json.dumps(response.__dict__), status=400, mimetype='application/json')