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annotate OrthancFramework/Sources/FileStorage/FilesystemStorage.cpp @ 5729:bdbaccc06e98

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Fix extremely rare error when 2 threads are trying to create the same folder in the File Storage at the same time
author Alain Mazy <am@orthanc.team>
date Fri, 26 Jul 2024 16:29:10 +0200
parents f7adfb22e20e
children 264d84c1936a
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1 /**
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2 * Orthanc - A Lightweight, RESTful DICOM Store
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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) 2017-2023 Osimis S.A., Belgium
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6 * Copyright (C) 2024-2024 Orthanc Team SRL, Belgium
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7 * Copyright (C) 2021-2024 Sebastien Jodogne, ICTEAM UCLouvain, Belgium
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8 *
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9 * This program is free software: you can redistribute it and/or
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10 * modify it under the terms of the GNU Lesser General Public License
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11 * as published by the Free Software Foundation, either version 3 of
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12 * the License, or (at your option) any later version.
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13 *
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14 * This program is distributed in the hope that it will be useful, but
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15 * WITHOUT ANY WARRANTY; without even the implied warranty of
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16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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17 * Lesser General Public License for more details.
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18 *
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19 * You should have received a copy of the GNU Lesser General Public
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20 * License along with this program. If not, see
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21 * <http://www.gnu.org/licenses/>.
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22 **/
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24
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25 #include "../PrecompiledHeaders.h"
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26 #include "FilesystemStorage.h"
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27 #include <boost/thread.hpp>
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29 // http://stackoverflow.com/questions/1576272/storing-large-number-of-files-in-file-system
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30 // http://stackoverflow.com/questions/446358/storing-a-large-number-of-images
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32 #include "../Logging.h"
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33 #include "../OrthancException.h"
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34 #include "../StringMemoryBuffer.h"
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35 #include "../SystemToolbox.h"
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36 #include "../Toolbox.h"
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38 #include <boost/filesystem/fstream.hpp>
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39
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41 static std::string ToString(const boost::filesystem::path& p)
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42 {
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43 #if BOOST_HAS_FILESYSTEM_V3 == 1
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44 return p.filename().string();
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45 #else
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46 return p.filename();
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47 #endif
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48 }
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51 namespace Orthanc
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52 {
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53 boost::filesystem::path FilesystemStorage::GetPath(const std::string& uuid) const
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54 {
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55 namespace fs = boost::filesystem;
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56
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57 if (!Toolbox::IsUuid(uuid))
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58 {
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59 throw OrthancException(ErrorCode_ParameterOutOfRange);
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60 }
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61
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62 fs::path path = root_;
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64 path /= std::string(&uuid[0], &uuid[2]);
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65 path /= std::string(&uuid[2], &uuid[4]);
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66 path /= uuid;
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67
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68 #if BOOST_HAS_FILESYSTEM_V3 == 1
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69 path.make_preferred();
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70 #endif
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72 return path;
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73 }
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74
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75 void FilesystemStorage::Setup(const std::string& root)
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76 {
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77 //root_ = boost::filesystem::absolute(root).string();
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78 root_ = root;
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80 SystemToolbox::MakeDirectory(root);
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81 }
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82
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83 FilesystemStorage::FilesystemStorage(const std::string &root) :
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84 fsyncOnWrite_(false)
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85 {
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86 Setup(root);
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87 }
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88
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89 FilesystemStorage::FilesystemStorage(const std::string &root,
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90 bool fsyncOnWrite) :
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91 fsyncOnWrite_(fsyncOnWrite)
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92 {
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93 Setup(root);
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94 }
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98 static const char* GetDescriptionInternal(FileContentType content)
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99 {
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100 // This function is for logging only (internal use), a more
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101 // fully-featured version is available in ServerEnumerations.cpp
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102 switch (content)
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103 {
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104 case FileContentType_Unknown:
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105 return "Unknown";
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106
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107 case FileContentType_Dicom:
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108 return "DICOM";
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109
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110 case FileContentType_DicomAsJson:
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111 return "JSON summary of DICOM";
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112
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113 case FileContentType_DicomUntilPixelData:
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114 return "DICOM until pixel data";
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115
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116 default:
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117 return "User-defined";
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118 }
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119 }
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120
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121
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122 void FilesystemStorage::Create(const std::string& uuid,
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123 const void* content,
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124 size_t size,
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125 FileContentType type)
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126 {
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127 Toolbox::ElapsedTimer timer;
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128 LOG(INFO) << "Creating attachment \"" << uuid << "\" of \"" << GetDescriptionInternal(type)
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129 << "\" type";
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130
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131 boost::filesystem::path path;
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132
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133 path = GetPath(uuid);
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134
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135 if (boost::filesystem::exists(path))
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136 {
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137 // Extremely unlikely case: This Uuid has already been created
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138 // in the past.
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139 throw OrthancException(ErrorCode_InternalError, "This file UUID already exists");
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140 }
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141
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142 // In very unlikely case (but we've seen it !), 2 threads might enter this same piece
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143 // of code and both try to create the same directory or a thread could be deleting a
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144 // directory while another thread needs it -> introduce 3 retries at 1 ms interval
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145 int retryCount = 0;
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146 const int maxRetryCount = 3;
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147
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148 while (retryCount < maxRetryCount)
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149 {
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150 retryCount++;
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151 if (retryCount > 1)
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152 {
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153 boost::this_thread::sleep(boost::posix_time::milliseconds(2 * retryCount + (rand() % 10)));
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154 LOG(INFO) << "Retrying to create attachment \"" << uuid << "\" of \"" << GetDescriptionInternal(type)
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155 << "\" type";
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156 }
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157
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158 if (boost::filesystem::exists(path.parent_path()))
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159 {
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160 if (!boost::filesystem::is_directory(path.parent_path()))
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161 {
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162 throw OrthancException(ErrorCode_DirectoryOverFile); // no need to retry this error
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163 }
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164 }
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165 else
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166 {
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167 if (!boost::filesystem::create_directories(path.parent_path()))
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168 {
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169 if (retryCount >= maxRetryCount)
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170 {
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171 throw OrthancException(ErrorCode_FileStorageCannotWrite);
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172 }
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173
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174 continue; // retry
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175 }
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176 }
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177
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178 try
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179 {
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180 SystemToolbox::WriteFile(content, size, path.string(), fsyncOnWrite_);
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181 }
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182 catch (OrthancException& ex)
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183 {
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184 if (retryCount >= maxRetryCount)
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185 {
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186 throw ex;
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187 }
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188 }
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189 }
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190
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191 LOG(INFO) << "Created attachment \"" << uuid << "\" (" << timer.GetHumanTransferSpeed(true, size) << ")";
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192 }
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193
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194
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195 IMemoryBuffer* FilesystemStorage::Read(const std::string& uuid,
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196 FileContentType type)
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197 {
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198 Toolbox::ElapsedTimer timer;
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199 LOG(INFO) << "Reading attachment \"" << uuid << "\" of \"" << GetDescriptionInternal(type)
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200 << "\" content type";
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201
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202 std::string content;
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203 SystemToolbox::ReadFile(content, GetPath(uuid).string());
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204
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205 LOG(INFO) << "Read attachment \"" << uuid << "\" (" << timer.GetHumanTransferSpeed(true, content.size()) << ")";
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206
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207 return StringMemoryBuffer::CreateFromSwap(content);
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208 }
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209
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210
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211 IMemoryBuffer* FilesystemStorage::ReadRange(const std::string& uuid,
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212 FileContentType type,
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213 uint64_t start /* inclusive */,
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214 uint64_t end /* exclusive */)
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215 {
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216 Toolbox::ElapsedTimer timer;
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217 LOG(INFO) << "Reading attachment \"" << uuid << "\" of \"" << GetDescriptionInternal(type)
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218 << "\" content type (range from " << start << " to " << end << ")";
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219
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220 std::string content;
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221 SystemToolbox::ReadFileRange(
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222 content, GetPath(uuid).string(), start, end, true /* throw if overflow */);
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223
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224 LOG(INFO) << "Read range of attachment \"" << uuid << "\" (" << timer.GetHumanTransferSpeed(true, content.size()) << ")";
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225 return StringMemoryBuffer::CreateFromSwap(content);
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226 }
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227
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228
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229 bool FilesystemStorage::HasReadRange() const
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230 {
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231 return true;
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232 }
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233
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234
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235 uintmax_t FilesystemStorage::GetSize(const std::string& uuid) const
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236 {
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237 boost::filesystem::path path = GetPath(uuid);
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238 return boost::filesystem::file_size(path);
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239 }
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240
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241
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242
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243 void FilesystemStorage::ListAllFiles(std::set<std::string>& result) const
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244 {
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245 namespace fs = boost::filesystem;
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246
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247 result.clear();
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248
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249 if (fs::exists(root_) && fs::is_directory(root_))
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250 {
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251 for (fs::recursive_directory_iterator current(root_), end; current != end ; ++current)
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252 {
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253 if (SystemToolbox::IsRegularFile(current->path().string()))
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254 {
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255 try
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256 {
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257 fs::path d = current->path();
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258 std::string uuid = ToString(d);
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259 if (Toolbox::IsUuid(uuid))
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260 {
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261 fs::path p0 = d.parent_path().parent_path().parent_path();
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262 std::string p1 = ToString(d.parent_path().parent_path());
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263 std::string p2 = ToString(d.parent_path());
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264 if (p1.length() == 2 &&
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265 p2.length() == 2 &&
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266 p1 == uuid.substr(0, 2) &&
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267 p2 == uuid.substr(2, 2) &&
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268 p0 == root_)
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269 {
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270 result.insert(uuid);
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271 }
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272 }
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273 }
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274 catch (fs::filesystem_error&)
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275 {
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276 }
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277 }
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278 }
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279 }
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280 }
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281
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282
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283 void FilesystemStorage::Clear()
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284 {
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285 namespace fs = boost::filesystem;
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286 typedef std::set<std::string> List;
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287
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288 List result;
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289 ListAllFiles(result);
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290
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291 for (List::const_iterator it = result.begin(); it != result.end(); ++it)
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292 {
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293 Remove(*it, FileContentType_Unknown /*ignored in this class*/);
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294 }
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295 }
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296
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297
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298 void FilesystemStorage::Remove(const std::string& uuid,
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299 FileContentType type)
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300 {
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301 LOG(INFO) << "Deleting attachment \"" << uuid << "\" of type " << static_cast<int>(type);
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302
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303 namespace fs = boost::filesystem;
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304
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305 fs::path p = GetPath(uuid);
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306
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307 try
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308 {
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309 fs::remove(p);
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310 }
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311 catch (...)
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312 {
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313 // Ignore the error
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314 }
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315
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316 // Remove the two parent directories, ignoring the error code if
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317 // these directories are not empty
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318
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319 try
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320 {
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321 #if BOOST_HAS_FILESYSTEM_V3 == 1
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322 boost::system::error_code err;
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323 fs::remove(p.parent_path(), err);
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324 fs::remove(p.parent_path().parent_path(), err);
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325 #else
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326 fs::remove(p.parent_path());
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327 fs::remove(p.parent_path().parent_path());
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328 #endif
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329 }
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330 catch (...)
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331 {
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332 // Ignore the error
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333 }
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334 }
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335
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336
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337 uintmax_t FilesystemStorage::GetCapacity() const
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338 {
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339 return boost::filesystem::space(root_).capacity;
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340 }
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341
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342 uintmax_t FilesystemStorage::GetAvailableSpace() const
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343 {
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344 return boost::filesystem::space(root_).available;
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345 }
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346
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347
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348 #if ORTHANC_BUILDING_FRAMEWORK_LIBRARY == 1
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349 FilesystemStorage::FilesystemStorage(std::string root) :
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350 fsyncOnWrite_(false)
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351 {
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352 Setup(root);
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353 }
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354 #endif
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355
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356
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357 #if ORTHANC_BUILDING_FRAMEWORK_LIBRARY == 1
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358 void FilesystemStorage::Read(std::string& content,
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359 const std::string& uuid,
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360 FileContentType type)
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361 {
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362 std::unique_ptr<IMemoryBuffer> buffer(Read(uuid, type));
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363 buffer->MoveToString(content);
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364 }
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365 #endif
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366 }