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1 // Copyright (c) 2015, the Dart project authors. Please see the AUTHORS file | 1 // Copyright (c) 2015, the Dart project authors. Please see the AUTHORS file |
2 // for details. All rights reserved. Use of this source code is governed by a | 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. | 3 // BSD-style license that can be found in the LICENSE file. |
4 | 4 |
5 part of dart.developer; | 5 part of dart.developer; |
6 | 6 |
7 class ServiceExtensionResponse { | 7 class ServiceExtensionResponse { |
8 final String _result; | 8 final String _result; |
9 final int _errorCode; | 9 final int _errorCode; |
10 final String _errorDetail; | 10 final String _errorDetail; |
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79 | 79 |
80 /// A service protocol extension handler. Registered with [registerExtension]. | 80 /// A service protocol extension handler. Registered with [registerExtension]. |
81 /// | 81 /// |
82 /// Must complete to a [ServiceExtensionResponse]. | 82 /// Must complete to a [ServiceExtensionResponse]. |
83 /// | 83 /// |
84 /// [method] - the method name. | 84 /// [method] - the method name. |
85 /// [parameters] - the parameters. | 85 /// [parameters] - the parameters. |
86 typedef Future<ServiceExtensionResponse> | 86 typedef Future<ServiceExtensionResponse> |
87 ServiceExtensionHandler(String method, Map parameters); | 87 ServiceExtensionHandler(String method, Map parameters); |
88 | 88 |
89 final _extensions = new Map<String, ServiceExtensionHandler>(); | |
90 | |
91 /// Register a [ServiceExtensionHandler] that will be invoked in this isolate | 89 /// Register a [ServiceExtensionHandler] that will be invoked in this isolate |
92 /// for [method]. | 90 /// for [method]. |
93 void registerExtension(String method, ServiceExtensionHandler handler) { | 91 void registerExtension(String method, ServiceExtensionHandler handler) { |
94 if (_extensions[method] != null) { | 92 if (method is! String) { |
| 93 throw new ArgumentError.value(method, |
| 94 'method', |
| 95 'Must be a String'); |
| 96 } |
| 97 if (_lookupExtension(method) != null) { |
95 throw new ArgumentError('Extension already registered: $method'); | 98 throw new ArgumentError('Extension already registered: $method'); |
96 } | 99 } |
97 if (handler is! ServiceExtensionHandler) { | 100 if (handler is! ServiceExtensionHandler) { |
98 throw new ArgumentError.value(handler, | 101 throw new ArgumentError.value(handler, |
99 'handler', | 102 'handler', |
100 'Must be a ServiceExtensionHandler'); | 103 'Must be a ServiceExtensionHandler'); |
101 } | 104 } |
102 _extensions[method] = handler; | 105 _registerExtension(method, handler); |
103 } | 106 } |
104 | 107 |
105 bool _scheduleExtension(String method, | 108 // Both of these functions are written inside C++ to avoid updating the data |
106 List<String> parameterKeys, | 109 // structures in Dart, getting an OOB, and observing stale state. Do not move |
107 List<String> parameterValues, | 110 // these into Dart code unless you can ensure that the operations will can be |
108 SendPort replyPort, | 111 // done atomically. Native code lives in vm/isolate.cc- |
109 Object id) { | 112 // LookupServiceExtensionHandler and RegisterServiceExtensionHandler. |
110 ServiceExtensionHandler handler = _extensions[method]; | 113 external ServiceExtensionHandler _lookupExtension(String method); |
111 if (handler == null) { | 114 external _registerExtension(String method, ServiceExtensionHandler handler); |
112 return false; | 115 |
| 116 // This code is only invoked when there is no other Dart code on the stack. |
| 117 _runExtension(ServiceExtensionHandler handler, |
| 118 String method, |
| 119 List<String> parameterKeys, |
| 120 List<String> parameterValues, |
| 121 SendPort replyPort, |
| 122 Object id) { |
| 123 var parameters = {}; |
| 124 for (var i = 0; i < parameterKeys.length; i++) { |
| 125 parameters[parameterKeys[i]] = parameterValues[i]; |
113 } | 126 } |
114 // Defer execution of handler until next event loop. | 127 var response; |
115 Timer.run(() { | 128 try { |
116 var parameters = {}; | 129 response = handler(method, parameters); |
117 for (var i = 0; i < parameterKeys.length; i++) { | 130 } catch (e, st) { |
118 parameters[parameterKeys[i]] = parameterValues[i]; | 131 var errorDetails = (st == null) ? '$e' : '$e\n$st'; |
119 } | 132 response = new ServiceExtensionResponse.error( |
120 var response; | 133 ServiceExtensionResponse.kExtensionError, |
121 try { | 134 errorDetails); |
122 response = handler(method, parameters); | 135 _postResponse(replyPort, id, response); |
123 } catch (e, st) { | 136 return; |
124 var errorDetails = (st == null) ? '$e' : '$e\n$st'; | 137 } |
| 138 if (response is! Future) { |
| 139 response = new ServiceExtensionResponse.error( |
| 140 ServiceExtensionResponse.kExtensionError, |
| 141 "Extension handler must return a Future"); |
| 142 _postResponse(replyPort, id, response); |
| 143 return; |
| 144 } |
| 145 response.catchError((e, st) { |
| 146 // Catch any errors eagerly and wrap them in a ServiceExtensionResponse. |
| 147 var errorDetails = (st == null) ? '$e' : '$e\n$st'; |
| 148 return new ServiceExtensionResponse.error( |
| 149 ServiceExtensionResponse.kExtensionError, |
| 150 errorDetails); |
| 151 }).then((response) { |
| 152 // Post the valid response or the wrapped error after verifying that |
| 153 // the response is a ServiceExtensionResponse. |
| 154 if (response is! ServiceExtensionResponse) { |
125 response = new ServiceExtensionResponse.error( | 155 response = new ServiceExtensionResponse.error( |
126 ServiceExtensionResponse.kExtensionError, | 156 ServiceExtensionResponse.kExtensionError, |
127 errorDetails); | 157 "Extension handler must complete to a ServiceExtensionResponse"); |
128 _postResponse(replyPort, id, response); | |
129 return; | |
130 } | 158 } |
131 if (response is! Future) { | 159 _postResponse(replyPort, id, response); |
132 response = new ServiceExtensionResponse.error( | 160 }).catchError((e, st) { |
133 ServiceExtensionResponse.kExtensionError, | 161 // We do not expect any errors to occur in the .then or .catchError blocks |
134 "Extension handler must return a Future"); | 162 // but, suppress them just in case. |
135 _postResponse(replyPort, id, response); | |
136 return; | |
137 } | |
138 response.catchError((e, st) { | |
139 var errorDetails = (st == null) ? '$e' : '$e\n$st'; | |
140 return new ServiceExtensionResponse.error( | |
141 ServiceExtensionResponse.kExtensionError, | |
142 errorDetails); | |
143 }).then((response) { | |
144 if (response == null) { | |
145 response = new ServiceExtensionResponse.error( | |
146 ServiceExtensionResponse.kExtensionError, | |
147 "Extension handler returned null"); | |
148 } | |
149 _postResponse(replyPort, id, response); | |
150 }); | |
151 }); | 163 }); |
152 return true; | |
153 } | 164 } |
154 | 165 |
| 166 // This code is only invoked by _runExtension. |
155 _postResponse(SendPort replyPort, | 167 _postResponse(SendPort replyPort, |
156 Object id, | 168 Object id, |
157 ServiceExtensionResponse response) { | 169 ServiceExtensionResponse response) { |
158 assert(replyPort != null); | 170 assert(replyPort != null); |
159 if (id == null) { | 171 if (id == null) { |
160 // No id -> no response. | 172 // No id -> no response. |
161 replyPort.send(null); | 173 replyPort.send(null); |
162 return; | 174 return; |
163 } | 175 } |
164 assert(id != null); | 176 assert(id != null); |
165 StringBuffer sb = new StringBuffer(); | 177 StringBuffer sb = new StringBuffer(); |
166 sb.write('{"jsonrpc":"2.0",'); | 178 sb.write('{"jsonrpc":"2.0",'); |
167 if (response._isError()) { | 179 if (response._isError()) { |
168 sb.write('"error":'); | 180 sb.write('"error":'); |
169 } else { | 181 } else { |
170 sb.write('"result":'); | 182 sb.write('"result":'); |
171 } | 183 } |
172 sb.write('${response._toString()},'); | 184 sb.write('${response._toString()},'); |
173 if (id is String) { | 185 if (id is String) { |
174 sb.write('"id":"$id"}'); | 186 sb.write('"id":"$id"}'); |
175 } else { | 187 } else { |
176 sb.write('"id":$id}'); | 188 sb.write('"id":$id}'); |
177 } | 189 } |
178 replyPort.send(sb.toString()); | 190 replyPort.send(sb.toString()); |
179 } | 191 } |
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