Mercurial > hg > orthanc-object-storage

annotate Google/GoogleStoragePlugin.cpp @ 81:e29987d80ecf

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fix
author Alain Mazy <am@osimis.io>
date Mon, 17 Oct 2022 13:38:32 +0200
parents b3787f4aa16a
children f30b9acf80f0
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1 /**
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2 * Cloud storage plugins for Orthanc
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3 * Copyright (C) 2020-2021 Osimis S.A., Belgium
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4 *
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5 * This program is free software: you can redistribute it and/or
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6 * modify it under the terms of the GNU Affero General Public License
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7 * as published by the Free Software Foundation, either version 3 of
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8 * the License, or (at your option) any later version.
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9 *
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10 * This program is distributed in the hope that it will be useful, but
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11 * WITHOUT ANY WARRANTY; without even the implied warranty of
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12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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13 * Affero General Public License for more details.
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14 *
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15 * You should have received a copy of the GNU Affero General Public License
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16 * along with this program. If not, see <http://www.gnu.org/licenses/>.
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17 **/
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18
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20 #include "GoogleStoragePlugin.h"
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21
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22 #include "google/cloud/storage/client.h"
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23
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24 // Create aliases to make the code easier to read.
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25 namespace gcs = google::cloud::storage;
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28 class GoogleStoragePlugin : public BaseStorage
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29 {
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30 public:
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32 std::string bucketName_;
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33 google::cloud::storage::Client mainClient_; // the client that is created at startup. Each thread should copy it when it needs it. (from the doc: Instances of this class created via copy-construction or copy-assignment share the underlying pool of connections. Access to these copies via multiple threads is guaranteed to work. Two threads operating on the same instance of this class is not guaranteed to work.)
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34 bool storageContainsUnknownFiles_;
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36 public:
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37
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38 GoogleStoragePlugin(const std::string& nameForLogs,
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39 const std::string& bucketName,
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40 google::cloud::storage::Client& mainClient,
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41 bool enableLegacyStorageStructure,
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42 bool storageContainsUnknownFiles
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43 );
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44
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45 virtual IWriter* GetWriterForObject(const char* uuid, OrthancPluginContentType type, bool encryptionEnabled);
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46 virtual IReader* GetReaderForObject(const char* uuid, OrthancPluginContentType type, bool encryptionEnabled);
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47 virtual bool DeleteObject(const char* uuid, OrthancPluginContentType type, bool encryptionEnabled);
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48 };
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51 class Writer : public IStorage::IWriter
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52 {
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53 std::string path_;
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54 gcs::Client client_;
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55 std::string bucketName_;
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56 gcs::ObjectWriteStream stream_;
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57 public:
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58 Writer(const std::string& bucketName, const std::string& path, gcs::Client& client)
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59 : path_(path),
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60 client_(client),
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61 bucketName_(bucketName)
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62 {
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63 }
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64
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65 virtual ~Writer()
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66 {
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67 }
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68
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69 virtual void Write(const char* data, size_t size)
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70 {
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71 stream_ = client_.WriteObject(bucketName_, path_);
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72
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73 if (stream_)
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74 {
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75 stream_.write(data, size);
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76 stream_.Close();
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78 if (!stream_.metadata())
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79 {
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80 throw StoragePluginException("GoogleCloudStorage: error while writing file " + std::string(path_) + ": " + stream_.metadata().status().message());
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81 }
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82 }
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83 else
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84 {
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85 throw StoragePluginException("GoogleCloudStorage: error while opening/writing file " + std::string(path_) + ": " + stream_.metadata().status().message());
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86 }
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87 }
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88 };
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91 class Reader : public IStorage::IReader
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92 {
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93 std::list<std::string> paths_;
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94 gcs::Client client_;
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95 std::string bucketName_;
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96
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97 public:
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98 Reader(const std::string& bucketName, const std::list<std::string>& paths, gcs::Client& client)
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99 : paths_(paths),
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100 client_(client),
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101 bucketName_(bucketName)
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102 {
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103 }
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104
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105 virtual ~Reader()
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106 {
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107
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108 }
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109
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110 virtual size_t GetSize()
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111 {
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112 std::string firstExceptionMessage;
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113
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114 for (auto& path: paths_)
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115 {
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116 try
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117 {
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118 return _GetSize(path);
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119 }
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120 catch (StoragePluginException& ex)
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121 {
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122 if (firstExceptionMessage.empty())
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123 {
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124 firstExceptionMessage = ex.what();
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125 }
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126 //ignore to retry
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127 }
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128 }
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129 throw StoragePluginException(firstExceptionMessage);
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130 }
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131
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132 void ReadWhole(char* data, size_t size)
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133 {
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134 std::string firstExceptionMessage;
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135
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136 for (auto& path: paths_)
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137 {
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138 try
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139 {
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140 return _ReadWhole(path, data, size);
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141 }
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142 catch (StoragePluginException& ex)
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143 {
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144 if (firstExceptionMessage.empty())
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145 {
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146 firstExceptionMessage = ex.what();
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147 }
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148 //ignore to retry
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149 }
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150 }
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151 throw StoragePluginException(firstExceptionMessage);
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152 }
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153
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154 void ReadRange(char* data, size_t size, size_t fromOffset)
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155 {
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156 std::string firstExceptionMessage;
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157
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158 for (auto& path: paths_)
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159 {
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160 try
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161 {
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162 return _ReadRange(path, data, size, fromOffset);
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163 }
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164 catch (StoragePluginException& ex)
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165 {
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166 if (firstExceptionMessage.empty())
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167 {
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168 firstExceptionMessage = ex.what();
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169 }
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170 //ignore to retry
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171 }
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172 }
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173 throw StoragePluginException(firstExceptionMessage);
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174 }
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175
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176 private:
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177 virtual void _ReadWhole(const std::string& path, char* data, size_t size)
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178 {
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179 auto reader = client_.ReadObject(bucketName_, path);
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180
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181 if (!reader)
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182 {
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183 throw StoragePluginException("error while opening/reading file " + std::string(path) + ": " + reader.status().message());
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184 }
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185
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186 reader.read(data, size);
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187
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188 if (!reader)
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189 {
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190 throw StoragePluginException("error while reading file " + std::string(path) + ": " + reader.status().message());
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191 }
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192 }
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193
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194 virtual void _ReadRange(const std::string& path, char* data, size_t size, size_t fromOffset)
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195 {
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196 auto reader = client_.ReadObject(bucketName_, path, gcs::ReadRange(fromOffset, fromOffset + size));
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197
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198 if (!reader)
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199 {
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200 throw StoragePluginException("error while opening/reading file " + std::string(path) + ": " + reader.status().message());
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201 }
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202
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203 reader.read(data, size);
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204
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205 if (!reader)
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206 {
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207 throw StoragePluginException("error while reading file " + std::string(path) + ": " + reader.status().message());
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208 }
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209 }
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210
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211 size_t _GetSize(const std::string& path)
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212 {
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213 auto objectMetadata = client_.GetObjectMetadata(bucketName_, path);
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214
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215 if (objectMetadata)
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216 {
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217 std::uint64_t fileSize = static_cast<int64_t>(objectMetadata->size());
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218
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219 return fileSize;
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220 }
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221 else
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222 {
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223 throw StoragePluginException("error while getting the size of " + std::string(path) + ": " + objectMetadata.status().message());
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224 }
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225 }
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226
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227 };
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228
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229
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230
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231 const char* GoogleStoragePluginFactory::GetStoragePluginName()
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232 {
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233 return "Google Cloud Storage";
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234 }
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235
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236 IStorage* GoogleStoragePluginFactory::CreateStorage(const std::string& nameForLogs, const OrthancPlugins::OrthancConfiguration& orthancConfig)
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237 {
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238 bool enableLegacyStorageStructure;
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239 bool storageContainsUnknownFiles;
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240
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241 if (!orthancConfig.IsSection(GetConfigurationSectionName()))
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242 {
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243 OrthancPlugins::LogWarning(std::string(GetStoragePluginName()) + " plugin, section missing. Plugin is not enabled.");
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244 return nullptr;
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245 }
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246
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247 OrthancPlugins::OrthancConfiguration pluginSection;
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248 orthancConfig.GetSection(pluginSection, GetConfigurationSectionName());
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249
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250 if (!BaseStorage::ReadCommonConfiguration(enableLegacyStorageStructure, storageContainsUnknownFiles, pluginSection))
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251 {
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252 return nullptr;
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253 }
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254
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255 std::string pathToGoogleCredentials;
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256
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257 if (!pluginSection.LookupStringValue(pathToGoogleCredentials, "ServiceAccountFile"))
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258 {
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259 OrthancPlugins::LogError("GoogleCloudStorage/ServiceAccountFile configuration missing. Unable to initialize plugin");
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260 return nullptr;
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261 }
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262
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263 std::string googleBucketName;
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264 if (!pluginSection.LookupStringValue(googleBucketName, "BucketName"))
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265 {
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266 OrthancPlugins::LogError("GoogleCloudStorage/BucketName configuration missing. Unable to initialize plugin");
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267 return nullptr;
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268 }
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269
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270 // Use service account credentials from a JSON keyfile:
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271 auto creds = gcs::oauth2::CreateServiceAccountCredentialsFromJsonFilePath(pathToGoogleCredentials);
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272 if (!creds)
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273 {
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274 OrthancPlugins::LogError("GoogleCloudStorage plugin: unable to validate credentials. Check the ServiceAccountFile: " + creds.status().message());
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275 return nullptr;
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276 }
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277
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278 // Create a client to communicate with Google Cloud Storage.
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279 google::cloud::StatusOr<gcs::Client> mainClient = gcs::Client(gcs::ClientOptions(*creds));
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280
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281 if (!mainClient)
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282 {
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283 OrthancPlugins::LogError("GoogleCloudStorage plugin: unable to create client: " + mainClient.status().message());
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284 return nullptr;
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285 }
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286
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287 return new GoogleStoragePlugin(nameForLogs, googleBucketName, mainClient.value(), enableLegacyStorageStructure, storageContainsUnknownFiles);
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288 }
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289
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290 GoogleStoragePlugin::GoogleStoragePlugin(const std::string& nameForLogs, const std::string &bucketName, google::cloud::storage::Client& mainClient, bool enableLegacyStorageStructure, bool storageContainsUnknownFiles)
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291 : BaseStorage(nameForLogs, enableLegacyStorageStructure),
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292 bucketName_(bucketName),
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293 mainClient_(mainClient),
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294 storageContainsUnknownFiles_(storageContainsUnknownFiles)
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295 {
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296
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297 }
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298
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299 IStorage::IWriter* GoogleStoragePlugin::GetWriterForObject(const char* uuid, OrthancPluginContentType type, bool encryptionEnabled)
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300 {
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301 return new Writer(bucketName_, GetPath(uuid, type, encryptionEnabled), mainClient_);
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302 }
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303
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304 IStorage::IReader* GoogleStoragePlugin::GetReaderForObject(const char* uuid, OrthancPluginContentType type, bool encryptionEnabled)
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305 {
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306 std::list<std::string> paths;
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307 paths.push_back(GetPath(uuid, type, encryptionEnabled, false));
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308 if (storageContainsUnknownFiles_)
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309 {
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310 paths.push_back(GetPath(uuid, type, encryptionEnabled, true));
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311 }
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312
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313 return new Reader(bucketName_, paths, mainClient_);
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314 }
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315
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316 bool GoogleStoragePlugin::DeleteObject(const char* uuid, OrthancPluginContentType type, bool encryptionEnabled)
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317 {
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318 gcs::Client client(mainClient_);
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319
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320 std::string path = GetPath(uuid, type, encryptionEnabled);
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321
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322 auto deletionStatus = client.DeleteObject(bucketName_, path);
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323
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324 if (!deletionStatus.ok())
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325 {
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326 throw StoragePluginException("GoogleCloudStorage: error while deleting file " + std::string(path) + ": " + deletionStatus.message());
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327 }
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328
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329 return false; // not 100% sure that the file has been deleted
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330 }