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comparison Framework/Toolbox/OrthancApiClient.cpp @ 270:2d64f4d39610 am-2

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author am@osimis.io
date Thu, 23 Aug 2018 14:45:04 +0200
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269:0dfa83535cd7 270:2d64f4d39610
1 /**
2 * Stone of Orthanc
3 * Copyright (C) 2012-2016 Sebastien Jodogne, Medical Physics
4 * Department, University Hospital of Liege, Belgium
5 * Copyright (C) 2017-2018 Osimis S.A., Belgium
6 *
7 * This program is free software: you can redistribute it and/or
8 * modify it under the terms of the GNU Affero General Public License
9 * as published by the Free Software Foundation, either version 3 of
10 * the License, or (at your option) any later version.
11 *
12 * This program is distributed in the hope that it will be useful, but
13 * WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Affero General Public License for more details.
16 *
17 * You should have received a copy of the GNU Affero General Public License
18 * along with this program. If not, see <http://www.gnu.org/licenses/>.
19 **/
20
21 #include "OrthancApiClient.h"
22
23 #include "MessagingToolbox.h"
24 #include <Core/OrthancException.h>
25
26 namespace OrthancStone {
27
28 struct OrthancApiClient::InternalGetJsonResponseReadyMessage :
29 public IMessage
30 {
31 OrthancApiClient::BaseRequest* request_;
32 Json::Value response_;
33
34 InternalGetJsonResponseReadyMessage(OrthancApiClient::BaseRequest* request,
35 const Json::Value& response)
36 : IMessage(MessageType_OrthancApi_InternalGetJsonResponseReady),
37 request_(request),
38 response_(response)
39 {
40 }
41
42 };
43
44 struct OrthancApiClient::InternalGetJsonResponseErrorMessage :
45 public IMessage
46 {
47 OrthancApiClient::BaseRequest* request_;
48
49 InternalGetJsonResponseErrorMessage(OrthancApiClient::BaseRequest* request)
50 : IMessage(MessageType_OrthancApi_InternalGetJsonResponseError),
51 request_(request)
52 {
53 }
54 };
55
56
57 // this class handles a single request to the OrthancApiClient.
58 // Once the response is ready, it will emit a message to the responseObserver
59 // the responseObserver must handle only that message (and not all messages from the OrthancApiClient)
60 class OrthancApiClient::BaseRequest:
61 public IObserver,
62 public IObservable,
63 public Orthanc::IDynamicObject
64 {
65 public:
66 std::string uri_;
67 OrthancApiClient& orthanc_;
68 MessageType messageToEmitWhenResponseReady_;
69 OrthancApiClient::Mode mode_;
70
71 public:
72 BaseRequest(
73 OrthancApiClient& orthanc,
74 IObserver& responseObserver,
75 const std::string& uri,
76 MessageType messageToEmitWhenResponseReady,
77 OrthancApiClient::Mode mode)
78 : IObserver(orthanc.broker_),
79 IObservable(orthanc.broker_),
80 uri_(uri),
81 orthanc_(orthanc),
82 messageToEmitWhenResponseReady_(messageToEmitWhenResponseReady),
83 mode_(mode)
84 {
85 // this object will emit only a single message, the one the final responseObserver is expecting
86 DeclareEmittableMessage(messageToEmitWhenResponseReady);
87
88 // this object is observing the OrthancApi so it must handle all messages
89 DeclareHandledMessage(MessageType_OrthancApi_InternalGetJsonResponseReady);
90 DeclareIgnoredMessage(MessageType_OrthancApi_InternalGetJsonResponseError);
91
92 orthanc_.RegisterObserver(*this);
93 this->RegisterObserver(responseObserver);
94 }
95 virtual ~BaseRequest() {}
96
97 // mainly maps OrthancApi internal messages to a message that is expected by the responseObserver
98 virtual void HandleMessage(IObservable& from, const IMessage& message)
99 {
100 switch (message.GetType())
101 {
102 case MessageType_OrthancApi_InternalGetJsonResponseReady:
103 {
104 const OrthancApiClient::InternalGetJsonResponseReadyMessage& messageReceived = dynamic_cast<const OrthancApiClient::InternalGetJsonResponseReadyMessage&>(message);
105 EmitMessage(OrthancApiClient::GetJsonResponseReadyMessage(messageToEmitWhenResponseReady_, messageReceived.request_->uri_, messageReceived.response_));
106 orthanc_.ReleaseRequest(messageReceived.request_);
107 }; break;
108 default:
109 throw MessageNotDeclaredException(message.GetType());
110 }
111 }
112
113 };
114
115
116 class OrthancApiClient::WebCallback : public IWebService::ICallback
117 {
118 private:
119 OrthancApiClient& that_;
120
121 public:
122 WebCallback(MessageBroker& broker, OrthancApiClient& that) :
123 IWebService::ICallback(broker),
124 that_(that)
125 {
126 }
127
128 virtual void OnHttpRequestSuccess(const std::string& uri,
129 const void* answer,
130 size_t answerSize,
131 Orthanc::IDynamicObject* payload)
132 {
133 OrthancApiClient::BaseRequest* request = dynamic_cast<OrthancApiClient::BaseRequest*>(payload); // the BaseRequests objects belongs to the OrthancApiClient and is deleted in ReleaseRequest when it has been "consumed"
134
135 switch (request->mode_)
136 {
137 case OrthancApiClient::Mode_GetJson:
138 {
139 Json::Value response;
140 if (MessagingToolbox::ParseJson(response, answer, answerSize))
141 {
142 OrthancApiClient::InternalGetJsonResponseReadyMessage msg(request, response);
143 that_.EmitMessage(msg);
144 }
145 else
146 {
147 OrthancApiClient::InternalGetJsonResponseErrorMessage msg(request);
148 that_.EmitMessage(msg);
149 }
150 }; break;
151
152 default:
153 that_.ReleaseRequest(request);
154 throw Orthanc::OrthancException(Orthanc::ErrorCode_InternalError);
155 }
156 }
157
158 virtual void OnHttpRequestError(const std::string& uri,
159 Orthanc::IDynamicObject* payload)
160 {
161 OrthancApiClient::BaseRequest* request = dynamic_cast<OrthancApiClient::BaseRequest*>(payload); // the BaseRequests objects belongs to the OrthancApiClient and is deleted in ReleaseRequest when it has been "consumed"
162
163 switch (request->mode_)
164 {
165 case OrthancApiClient::Mode_GetJson:
166 {
167 OrthancApiClient::InternalGetJsonResponseErrorMessage msg(request);
168 that_.EmitMessage(msg);
169 }; break;
170
171 default:
172 that_.ReleaseRequest(request);
173 throw Orthanc::OrthancException(Orthanc::ErrorCode_InternalError);
174 }
175 }
176 };
177
178 OrthancApiClient::OrthancApiClient(MessageBroker &broker, IWebService &orthanc)
179 : IObservable(broker),
180 orthanc_(orthanc),
181 webCallback_(new OrthancApiClient::WebCallback(broker, *this))
182 {
183 DeclareEmittableMessage(MessageType_OrthancApi_InternalGetJsonResponseReady);
184 DeclareEmittableMessage(MessageType_OrthancApi_InternalGetJsonResponseError);
185 }
186
187 void OrthancApiClient::ScheduleGetJsonRequest(IObserver &responseObserver, const std::string &uri, MessageType messageToEmitWhenResponseReady)
188 {
189 OrthancApiClient::BaseRequest* request = new OrthancApiClient::BaseRequest(*this,
190 responseObserver,
191 uri,
192 messageToEmitWhenResponseReady,
193 OrthancApiClient::Mode_GetJson);
194 orthanc_.ScheduleGetRequest(*webCallback_, uri, IWebService::Headers(), request);
195 requestsInProgress_.insert(request);
196 }
197
198 void OrthancApiClient::ReleaseRequest(BaseRequest* request)
199 {
200 requestsInProgress_.erase(request);
201 delete request;
202 }
203
204 }