Mercurial > hg > orthanc-object-storage

annotate Google/GoogleStoragePlugin.cpp @ 155:cf1c7c4441b4

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cleaning
author Sebastien Jodogne <s.jodogne@gmail.com>
date Sat, 22 Jun 2024 17:12:20 +0200
parents 6dd8bb916573
children 80657f326c68
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1 /**
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2 * Cloud storage plugins for Orthanc
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3 * Copyright (C) 2020-2023 Osimis S.A., Belgium
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4 * Copyright (C) 2024-2024 Orthanc Team SRL, Belgium
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5 * Copyright (C) 2021-2024 Sebastien Jodogne, ICTEAM UCLouvain, 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
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22 #include "GoogleStoragePlugin.h"
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23
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24 #include "google/cloud/storage/client.h"
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25
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26 #include <Logging.h>
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28 // Create aliases to make the code easier to read.
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29 namespace gcs = google::cloud::storage;
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32 class GoogleStoragePlugin : public BaseStorage
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33 {
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34 public:
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36 std::string bucketName_;
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37 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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38 bool storageContainsUnknownFiles_;
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40 public:
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41
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42 GoogleStoragePlugin(const std::string& nameForLogs,
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43 const std::string& bucketName,
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44 google::cloud::storage::Client& mainClient,
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45 bool enableLegacyStorageStructure,
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46 bool storageContainsUnknownFiles
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47 );
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48
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49 virtual IWriter* GetWriterForObject(const char* uuid, OrthancPluginContentType type, bool encryptionEnabled) ORTHANC_OVERRIDE;
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50 virtual IReader* GetReaderForObject(const char* uuid, OrthancPluginContentType type, bool encryptionEnabled) ORTHANC_OVERRIDE;
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51 virtual void DeleteObject(const char* uuid, OrthancPluginContentType type, bool encryptionEnabled) ORTHANC_OVERRIDE;
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52 virtual bool HasFileExists() ORTHANC_OVERRIDE {return false;};
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53 };
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56 class Writer : public IStorage::IWriter
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57 {
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58 std::string path_;
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59 gcs::Client client_;
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60 std::string bucketName_;
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61 gcs::ObjectWriteStream stream_;
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62 public:
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63 Writer(const std::string& bucketName, const std::string& path, gcs::Client& client)
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64 : path_(path),
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65 client_(client),
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66 bucketName_(bucketName)
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67 {
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68 }
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69
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70 virtual ~Writer()
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71 {
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72 }
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74 virtual void Write(const char* data, size_t size) ORTHANC_OVERRIDE
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75 {
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76 stream_ = client_.WriteObject(bucketName_, path_);
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77
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78 if (stream_)
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79 {
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80 stream_.write(data, size);
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81 stream_.Close();
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82
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83 if (!stream_.metadata())
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84 {
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85 throw StoragePluginException("GoogleCloudStorage: error while writing file " + std::string(path_) + ": " + stream_.metadata().status().message());
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86 }
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87 }
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88 else
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89 {
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90 throw StoragePluginException("GoogleCloudStorage: error while opening/writing file " + std::string(path_) + ": " + stream_.metadata().status().message());
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91 }
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92 }
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93 };
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94
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96 class Reader : public IStorage::IReader
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97 {
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98 std::list<std::string> paths_;
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99 gcs::Client client_;
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100 std::string bucketName_;
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101
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102 public:
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103 Reader(const std::string& bucketName, const std::list<std::string>& paths, gcs::Client& client)
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104 : paths_(paths),
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105 client_(client),
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106 bucketName_(bucketName)
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107 {
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108 }
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109
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110 virtual ~Reader()
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111 {
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112
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113 }
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115 virtual size_t GetSize() ORTHANC_OVERRIDE
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116 {
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117 std::string firstExceptionMessage;
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118
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119 for (auto& path: paths_)
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120 {
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121 try
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122 {
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123 return _GetSize(path);
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124 }
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125 catch (StoragePluginException& ex)
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126 {
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127 if (firstExceptionMessage.empty())
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128 {
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129 firstExceptionMessage = ex.what();
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130 }
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131 //ignore to retry
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132 }
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133 }
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134 throw StoragePluginException(firstExceptionMessage);
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135 }
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136
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137 virtual void ReadWhole(char* data, size_t size) ORTHANC_OVERRIDE
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138 {
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139 std::string firstExceptionMessage;
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140
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141 for (auto& path: paths_)
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142 {
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143 try
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144 {
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145 return _ReadWhole(path, data, size);
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146 }
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147 catch (StoragePluginException& ex)
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148 {
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149 if (firstExceptionMessage.empty())
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150 {
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151 firstExceptionMessage = ex.what();
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152 }
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153 //ignore to retry
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154 }
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155 }
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156 throw StoragePluginException(firstExceptionMessage);
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157 }
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158
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159 virtual void ReadRange(char* data, size_t size, size_t fromOffset) ORTHANC_OVERRIDE
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160 {
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161 std::string firstExceptionMessage;
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162
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163 for (auto& path: paths_)
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164 {
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165 try
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166 {
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167 return _ReadRange(path, data, size, fromOffset);
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168 }
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169 catch (StoragePluginException& ex)
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170 {
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171 if (firstExceptionMessage.empty())
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172 {
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173 firstExceptionMessage = ex.what();
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174 }
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175 //ignore to retry
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176 }
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177 }
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178 throw StoragePluginException(firstExceptionMessage);
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179 }
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180
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181 private:
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182 virtual void _ReadWhole(const std::string& path, char* data, size_t size) ORTHANC_OVERRIDE
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183 {
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184 auto reader = client_.ReadObject(bucketName_, path);
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185
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186 if (!reader)
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187 {
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188 throw StoragePluginException("error while opening/reading file " + std::string(path) + ": " + reader.status().message());
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189 }
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190
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191 reader.read(data, size);
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192
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193 if (!reader)
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194 {
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195 throw StoragePluginException("error while reading file " + std::string(path) + ": " + reader.status().message());
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196 }
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197 }
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198
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199 virtual void _ReadRange(const std::string& path, char* data, size_t size, size_t fromOffset) ORTHANC_OVERRIDE
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200 {
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201 auto reader = client_.ReadObject(bucketName_, path, gcs::ReadRange(fromOffset, fromOffset + size));
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202
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203 if (!reader)
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204 {
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205 throw StoragePluginException("error while opening/reading file " + std::string(path) + ": " + reader.status().message());
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206 }
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207
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208 reader.read(data, size);
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209
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210 if (!reader)
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211 {
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212 throw StoragePluginException("error while reading file " + std::string(path) + ": " + reader.status().message());
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213 }
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214 }
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215
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216 virtual size_t _GetSize(const std::string& path) ORTHANC_OVERRIDE
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217 {
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218 auto objectMetadata = client_.GetObjectMetadata(bucketName_, path);
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219
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220 if (objectMetadata)
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221 {
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222 std::uint64_t fileSize = static_cast<int64_t>(objectMetadata->size());
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223
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224 return fileSize;
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225 }
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226 else
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227 {
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228 throw StoragePluginException("error while getting the size of " + std::string(path) + ": " + objectMetadata.status().message());
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229 }
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230 }
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231
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232 };
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233
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234
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235
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236 const char* GoogleStoragePluginFactory::GetStoragePluginName()
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237 {
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238 return "Google Cloud Storage";
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239 }
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240
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241 const char* GoogleStoragePluginFactory::GetStorageDescription()
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242 {
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243 return "Stores the Orthanc storage area in Google Cloud";
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244 }
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245
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246 IStorage* GoogleStoragePluginFactory::CreateStorage(const std::string& nameForLogs, const OrthancPlugins::OrthancConfiguration& orthancConfig)
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247 {
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248 bool enableLegacyStorageStructure;
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249 bool storageContainsUnknownFiles;
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250
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251 if (!orthancConfig.IsSection(GetConfigurationSectionName()))
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252 {
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253 LOG(WARNING) << GetStoragePluginName() << " plugin, section missing. Plugin is not enabled.";
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254 return nullptr;
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255 }
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256
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257 OrthancPlugins::OrthancConfiguration pluginSection;
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258 orthancConfig.GetSection(pluginSection, GetConfigurationSectionName());
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259
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260 if (!BaseStorage::ReadCommonConfiguration(enableLegacyStorageStructure, storageContainsUnknownFiles, pluginSection))
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261 {
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262 return nullptr;
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263 }
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264
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265 std::string pathToGoogleCredentials;
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266
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267 if (!pluginSection.LookupStringValue(pathToGoogleCredentials, "ServiceAccountFile"))
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268 {
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269 LOG(ERROR) << "GoogleCloudStorage/ServiceAccountFile configuration missing. Unable to initialize plugin";
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270 return nullptr;
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271 }
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272
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273 std::string googleBucketName;
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274 if (!pluginSection.LookupStringValue(googleBucketName, "BucketName"))
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275 {
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276 LOG(ERROR) << "GoogleCloudStorage/BucketName configuration missing. Unable to initialize plugin";
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277 return nullptr;
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278 }
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279
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280 // Use service account credentials from a JSON keyfile:
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281 auto creds = gcs::oauth2::CreateServiceAccountCredentialsFromJsonFilePath(pathToGoogleCredentials);
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282 if (!creds)
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283 {
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284 LOG(ERROR) << "GoogleCloudStorage plugin: unable to validate credentials. Check the ServiceAccountFile: " << creds.status().message();
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285 return nullptr;
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286 }
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287
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288 // Create a client to communicate with Google Cloud Storage.
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289 google::cloud::StatusOr<gcs::Client> mainClient = gcs::Client(gcs::ClientOptions(*creds));
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290
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291 if (!mainClient)
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292 {
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293 LOG(ERROR) << "GoogleCloudStorage plugin: unable to create client: " << mainClient.status().message();
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294 return nullptr;
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295 }
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296
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297 return new GoogleStoragePlugin(nameForLogs, googleBucketName, mainClient.value(), enableLegacyStorageStructure, storageContainsUnknownFiles);
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298 }
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299
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300 GoogleStoragePlugin::GoogleStoragePlugin(const std::string& nameForLogs, const std::string &bucketName, google::cloud::storage::Client& mainClient, bool enableLegacyStorageStructure, bool storageContainsUnknownFiles)
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301 : BaseStorage(nameForLogs, enableLegacyStorageStructure),
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302 bucketName_(bucketName),
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303 mainClient_(mainClient),
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304 storageContainsUnknownFiles_(storageContainsUnknownFiles)
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305 {
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306
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307 }
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308
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309 IStorage::IWriter* GoogleStoragePlugin::GetWriterForObject(const char* uuid, OrthancPluginContentType type, bool encryptionEnabled)
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310 {
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311 return new Writer(bucketName_, GetPath(uuid, type, encryptionEnabled), mainClient_);
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312 }
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313
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314 IStorage::IReader* GoogleStoragePlugin::GetReaderForObject(const char* uuid, OrthancPluginContentType type, bool encryptionEnabled)
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315 {
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316 std::list<std::string> paths;
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317 paths.push_back(GetPath(uuid, type, encryptionEnabled, false));
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318 if (storageContainsUnknownFiles_)
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319 {
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320 paths.push_back(GetPath(uuid, type, encryptionEnabled, true));
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321 }
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322
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323 return new Reader(bucketName_, paths, mainClient_);
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324 }
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325
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326 void GoogleStoragePlugin::DeleteObject(const char* uuid, OrthancPluginContentType type, bool encryptionEnabled)
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327 {
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328 gcs::Client client(mainClient_);
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329
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330 std::string path = GetPath(uuid, type, encryptionEnabled);
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331
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332 auto deletionStatus = client.DeleteObject(bucketName_, path);
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333
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334 if (!deletionStatus.ok())
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335 {
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336 throw StoragePluginException("GoogleCloudStorage: error while deleting file " + std::string(path) + ": " + deletionStatus.message());
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337 }
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338 }