annotate Core/FileStorage/FilesystemStorage.cpp @ 1352:382439943749

ResourceFinder
author Sebastien Jodogne <s.jodogne@gmail.com>
date Mon, 11 May 2015 17:25:53 +0200
parents 6e7e5ed91c2d
children 704de8c30ff5
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1 /**
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2 * Orthanc - A Lightweight, RESTful DICOM Store
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3 * Copyright (C) 2012-2015 Sebastien Jodogne, Medical Physics
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4 * Department, University Hospital of Liege, Belgium
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5 *
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6 * This program is free software: you can redistribute it and/or
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7 * modify it under the terms of the GNU General Public License as
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8 * published by the Free Software Foundation, either version 3 of the
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9 * License, or (at your option) any later version.
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10 *
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11 * In addition, as a special exception, the copyright holders of this
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12 * program give permission to link the code of its release with the
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13 * OpenSSL project's "OpenSSL" library (or with modified versions of it
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14 * that use the same license as the "OpenSSL" library), and distribute
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15 * the linked executables. You must obey the GNU General Public License
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16 * in all respects for all of the code used other than "OpenSSL". If you
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17 * modify file(s) with this exception, you may extend this exception to
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18 * your version of the file(s), but you are not obligated to do so. If
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19 * you do not wish to do so, delete this exception statement from your
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20 * version. If you delete this exception statement from all source files
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21 * in the program, then also delete it here.
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22 *
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23 * This program is distributed in the hope that it will be useful, but
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24 * WITHOUT ANY WARRANTY; without even the implied warranty of
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25 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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26 * General Public License for more details.
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27 *
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28 * You should have received a copy of the GNU General Public License
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29 * along with this program. If not, see <http://www.gnu.org/licenses/>.
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30 **/
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32
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33 #include "../PrecompiledHeaders.h"
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34 #include "FilesystemStorage.h"
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36 // http://stackoverflow.com/questions/1576272/storing-large-number-of-files-in-file-system
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37 // http://stackoverflow.com/questions/446358/storing-a-large-number-of-images
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38
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39 #include "../OrthancException.h"
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40 #include "../Toolbox.h"
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41 #include "../Uuid.h"
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43 #include <boost/filesystem/fstream.hpp>
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44 #include <glog/logging.h>
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45
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46 static std::string ToString(const boost::filesystem::path& p)
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47 {
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48 #if BOOST_HAS_FILESYSTEM_V3 == 1
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49 return p.filename().string();
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50 #else
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51 return p.filename();
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52 #endif
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53 }
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55
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56 namespace Orthanc
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57 {
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58 boost::filesystem::path FilesystemStorage::GetPath(const std::string& uuid) const
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59 {
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60 namespace fs = boost::filesystem;
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61
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62 if (!Toolbox::IsUuid(uuid))
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63 {
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64 throw OrthancException(ErrorCode_ParameterOutOfRange);
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65 }
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67 fs::path path = root_;
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69 path /= std::string(&uuid[0], &uuid[2]);
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70 path /= std::string(&uuid[2], &uuid[4]);
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71 path /= uuid;
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72
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73 #if BOOST_HAS_FILESYSTEM_V3 == 1
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74 path.make_preferred();
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75 #endif
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77 return path;
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78 }
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79
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80 FilesystemStorage::FilesystemStorage(std::string root)
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81 {
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82 //root_ = boost::filesystem::absolute(root).string();
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83 root_ = root;
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84
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85 Toolbox::CreateDirectory(root);
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86 }
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87
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88 void FilesystemStorage::Create(const std::string& uuid,
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89 const void* content,
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90 size_t size,
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91 FileContentType /*type*/)
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92 {
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93 boost::filesystem::path path;
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94
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95 path = GetPath(uuid);
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97 if (boost::filesystem::exists(path))
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98 {
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99 // Extremely unlikely case: This Uuid has already been created
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100 // in the past.
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101 throw OrthancException(ErrorCode_InternalError);
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102 }
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103
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104 if (boost::filesystem::exists(path.parent_path()))
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105 {
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106 if (!boost::filesystem::is_directory(path.parent_path()))
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107 {
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108 throw OrthancException("The subdirectory to be created is already occupied by a regular file");
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109 }
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110 }
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111 else
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112 {
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113 if (!boost::filesystem::create_directories(path.parent_path()))
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114 {
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115 throw OrthancException("Unable to create a subdirectory in the file storage");
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116 }
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117 }
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118
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119 boost::filesystem::ofstream f;
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120 f.open(path, std::ofstream::out | std::ios::binary);
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121 if (!f.good())
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122 {
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123 throw OrthancException("Unable to create a new file in the file storage");
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124 }
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125
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126 if (size != 0)
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127 {
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128 f.write(static_cast<const char*>(content), size);
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129 if (!f.good())
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130 {
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131 f.close();
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132 throw OrthancException("Unable to write to the new file in the file storage");
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133 }
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134 }
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135
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136 f.close();
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137 }
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138
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139
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140 void FilesystemStorage::Read(std::string& content,
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141 const std::string& uuid,
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142 FileContentType /*type*/)
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143 {
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144 content.clear();
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145 Toolbox::ReadFile(content, GetPath(uuid).string());
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146 }
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147
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148
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149 uintmax_t FilesystemStorage::GetSize(const std::string& uuid) const
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150 {
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151 boost::filesystem::path path = GetPath(uuid);
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152 return boost::filesystem::file_size(path);
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153 }
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154
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155
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156
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157 void FilesystemStorage::ListAllFiles(std::set<std::string>& result) const
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158 {
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159 namespace fs = boost::filesystem;
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160
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161 result.clear();
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162
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163 if (fs::exists(root_) && fs::is_directory(root_))
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164 {
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165 for (fs::recursive_directory_iterator current(root_), end; current != end ; ++current)
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166 {
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167 if (fs::is_regular_file(current->status()))
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168 {
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169 try
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170 {
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171 fs::path d = current->path();
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172 std::string uuid = ToString(d);
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173 if (Toolbox::IsUuid(uuid))
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174 {
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175 fs::path p0 = d.parent_path().parent_path().parent_path();
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176 std::string p1 = ToString(d.parent_path().parent_path());
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177 std::string p2 = ToString(d.parent_path());
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178 if (p1.length() == 2 &&
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179 p2.length() == 2 &&
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180 p1 == uuid.substr(0, 2) &&
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181 p2 == uuid.substr(2, 2) &&
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182 p0 == root_)
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183 {
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184 result.insert(uuid);
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185 }
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186 }
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187 }
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188 catch (fs::filesystem_error)
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189 {
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190 }
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191 }
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192 }
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193 }
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194 }
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195
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196
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197 void FilesystemStorage::Clear()
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198 {
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199 namespace fs = boost::filesystem;
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200 typedef std::set<std::string> List;
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201
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202 List result;
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203 ListAllFiles(result);
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204
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205 for (List::const_iterator it = result.begin(); it != result.end(); ++it)
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206 {
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207 Remove(*it, FileContentType_Unknown /*ignored in this class*/);
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208 }
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209 }
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210
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211
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212 void FilesystemStorage::Remove(const std::string& uuid,
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213 FileContentType /*type*/)
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214 {
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215 LOG(INFO) << "Deleting file " << uuid;
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216 namespace fs = boost::filesystem;
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217
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218 fs::path p = GetPath(uuid);
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219
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220 try
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221 {
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222 fs::remove(p);
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223 }
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224 catch (...)
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225 {
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226 // Ignore the error
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227 }
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228
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229 // Remove the two parent directories, ignoring the error code if
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230 // these directories are not empty
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231
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232 try
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233 {
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234 #if BOOST_HAS_FILESYSTEM_V3 == 1
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235 boost::system::error_code err;
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236 fs::remove(p.parent_path(), err);
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237 fs::remove(p.parent_path().parent_path(), err);
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238 #else
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239 fs::remove(p.parent_path());
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240 fs::remove(p.parent_path().parent_path());
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241 #endif
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242 }
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243 catch (...)
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244 {
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245 // Ignore the error
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246 }
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247 }
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248
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249
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250 uintmax_t FilesystemStorage::GetCapacity() const
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251 {
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252 return boost::filesystem::space(root_).capacity;
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253 }
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254
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255 uintmax_t FilesystemStorage::GetAvailableSpace() const
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256 {
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257 return boost::filesystem::space(root_).available;
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258 }
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259 }