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