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Side by Side Diff: pkg/json_rpc_2/lib/src/exception.dart

Issue 205533005: Create a package that implements a JSON-RPC 2.0 server. (Closed) Base URL: https://dart.googlecode.com/svn/branches/bleeding_edge/dart
Patch Set: Created 6 years, 9 months ago
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1 // Copyright (c) 2014, the Dart project authors. Please see the AUTHORS file
2 // for details. All rights reserved. Use of this source code is governed by a
3 // BSD-style license that can be found in the LICENSE file.
4
5 library json_rpc_2.exception;
6
7 import '../error_code.dart' as error_code;
8
9 /// An exception from a JSON-RPC server that can be translated into an error
10 /// response.
11 class RpcException implements Exception {
12 /// The error code.
13 ///
14 /// All non-negative error codes are available for use by application
15 /// developers.
16 final int code;
17
18 /// The error message.
19 ///
20 /// This should be limited to a concise single sentence. Further information
21 /// should be supplied via [data].
22 final String message;
23
24 /// Extra application-defined information about the error.
25 ///
26 /// This must be a JSON-serializable object. If it's a [Map] without a
27 /// `"request"` key, a copy of the request that caused the error will
28 /// automatically be injected.
29 final data;
30
31 RpcException(this.code, this.message, {this.data});
32
33 /// An exception indicating that the method named [methodName] was not found.
34 ///
35 /// This should usually be used only by fallback handlers.
36 RpcException.methodNotFound(String methodName)
37 : this(error_code.METHOD_NOT_FOUND, 'Unknown method "$methodName".');
38
39 /// An exception indicating that the parameters for the requested method were
40 /// invalid.
41 ///
42 /// Methods can use this to reject requests with invalid parameters.
43 RpcException.invalidParams(String message)
44 : this(error_code.INVALID_PARAMS, message);
45
46 /// Converts this exception into a JSON-serializable object that's a valid
47 /// JSON-RPC 2.0 error response.
48 serialize(request) {
49 var modifiedData;
50 if (data is Map && !data.containsKey('request')) {
51 modifiedData = new Map.from(data);
52 modifiedData['request'] = request;
53 } else if (data == null) {
54 modifiedData = {'request': request};
55 }
56
57 var id = request is Map ? request['id'] : null;
58 if (id is! String && id is! num) id = null;
59 return {
60 'jsonrpc': '2.0',
61 'error': {'code': code, 'message': message, 'data': modifiedData},
62 'id': id
63 };
64 }
65 }
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