exception model and handling in flutter

Author: lohanidamodar

templates/flutter/lib/client.dart.twig

@@ -108,18 +108,24 @@ class Client {
             method: method.name(),
         );
 
-        if(headers['content-type'] == 'multipart/form-data') {
-            return http.request(path, data: FormData.fromMap(params), options: options);
-        }
+        try {
+            if(headers['content-type'] == 'multipart/form-data') {
+                return http.request(path, data: FormData.fromMap(params), options: options);
+            }
 
-        if (method == HttpMethod.get) {
-            params.keys.forEach((key) {if (params[key] is int || params[key] is double) {
-              params[key] = params[key].toString();
-            }});
-            
-            return http.get(path, queryParameters: params, options: options);
-        } else {
-            return http.request(path, data: params, options: options);
+            if (method == HttpMethod.get) {
+                params.keys.forEach((key) {if (params[key] is int || params[key] is double) {
+                params[key] = params[key].toString();
+                }});
+                
+                return http.get(path, queryParameters: params, options: options);
+            } else {
+                return http.request(path, data: params, options: options);
+            }
+        } on DioError catch(e) {
+          throw {{spec.title | caseUcfirst}}Exception(e.response.data['message'],e.response.data['code'], e.response.data);
+        } catch(e) {
+          throw {{spec.title | caseUcfirst}}Exception(e.message, 0);
         }
     }
 }

templates/flutter/lib/exception.dart.twig

@@ -0,0 +1,10 @@
+part of {{ language.params.packageName }};
+
+class {{spec.title | caseUcfirst}}Exception implements Exception {
+  final String message;
+  final int code;
+  final dynamic response;
+
+  {{spec.title | caseUcfirst}}Exception([this.message = "", this.code = 0, this.response]);
+  
+}

templates/flutter/lib/package.dart.twig

@@ -18,6 +18,7 @@ export 'package:dio/dio.dart' show Response;
 part 'client.dart';
 part 'enums.dart';
 part 'service.dart';
+part 'exception.dart';
 {% for service in spec.services %}
 part 'services/{{service.name | caseDash}}.dart';
 {% endfor %}