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comparison Orthanc/FileStorage/FilesystemStorage.cpp @ 0:02f7a0400a91

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initial commit
author Sebastien Jodogne <s.jodogne@gmail.com>
date Wed, 25 Feb 2015 13:45:35 +0100
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children 7a0af291cc90
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-1:000000000000 0:02f7a0400a91
1 /**
2 * Orthanc - A Lightweight, RESTful DICOM Store
3 * Copyright (C) 2012-2015 Sebastien Jodogne, Medical Physics
4 * Department, University Hospital of Liege, Belgium
5 *
6 * This program is free software: you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License as
8 * published by the Free Software Foundation, either version 3 of the
9 * License, or (at your option) any later version.
10 *
11 * In addition, as a special exception, the copyright holders of this
12 * program give permission to link the code of its release with the
13 * OpenSSL project's "OpenSSL" library (or with modified versions of it
14 * that use the same license as the "OpenSSL" library), and distribute
15 * the linked executables. You must obey the GNU General Public License
16 * in all respects for all of the code used other than "OpenSSL". If you
17 * modify file(s) with this exception, you may extend this exception to
18 * your version of the file(s), but you are not obligated to do so. If
19 * you do not wish to do so, delete this exception statement from your
20 * version. If you delete this exception statement from all source files
21 * in the program, then also delete it here.
22 *
23 * This program is distributed in the hope that it will be useful, but
24 * WITHOUT ANY WARRANTY; without even the implied warranty of
25 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
26 * General Public License for more details.
27 *
28 * You should have received a copy of the GNU General Public License
29 * along with this program. If not, see <http://www.gnu.org/licenses/>.
30 **/
31
32
33 #include "../PrecompiledHeaders.h"
34 #include "FilesystemStorage.h"
35
36 // http://stackoverflow.com/questions/1576272/storing-large-number-of-files-in-file-system
37 // http://stackoverflow.com/questions/446358/storing-a-large-number-of-images
38
39 #include "../OrthancException.h"
40 #include "../Toolbox.h"
41 #include "../Uuid.h"
42
43 #include <boost/filesystem/fstream.hpp>
44
45 static std::string ToString(const boost::filesystem::path& p)
46 {
47 #if BOOST_HAS_FILESYSTEM_V3 == 1
48 return p.filename().string();
49 #else
50 return p.filename();
51 #endif
52 }
53
54
55 namespace Orthanc
56 {
57 boost::filesystem::path FilesystemStorage::GetPath(const std::string& uuid) const
58 {
59 namespace fs = boost::filesystem;
60
61 if (!Toolbox::IsUuid(uuid))
62 {
63 throw OrthancException(ErrorCode_ParameterOutOfRange);
64 }
65
66 fs::path path = root_;
67
68 path /= std::string(&uuid[0], &uuid[2]);
69 path /= std::string(&uuid[2], &uuid[4]);
70 path /= uuid;
71
72 #if BOOST_HAS_FILESYSTEM_V3 == 1
73 path.make_preferred();
74 #endif
75
76 return path;
77 }
78
79 FilesystemStorage::FilesystemStorage(std::string root)
80 {
81 //root_ = boost::filesystem::absolute(root).string();
82 root_ = root;
83
84 Toolbox::CreateNewDirectory(root);
85 }
86
87 void FilesystemStorage::Create(const std::string& uuid,
88 const void* content,
89 size_t size)
90 {
91 boost::filesystem::path path;
92
93 path = GetPath(uuid);
94
95 if (boost::filesystem::exists(path))
96 {
97 // Extremely unlikely case: This Uuid has already been created
98 // in the past.
99 throw OrthancException(ErrorCode_InternalError);
100 }
101
102 if (boost::filesystem::exists(path.parent_path()))
103 {
104 if (!boost::filesystem::is_directory(path.parent_path()))
105 {
106 throw OrthancException("The subdirectory to be created is already occupied by a regular file");
107 }
108 }
109 else
110 {
111 if (!boost::filesystem::create_directories(path.parent_path()))
112 {
113 throw OrthancException("Unable to create a subdirectory in the file storage");
114 }
115 }
116
117 boost::filesystem::ofstream f;
118 f.open(path, std::ofstream::out | std::ios::binary);
119 if (!f.good())
120 {
121 throw OrthancException("Unable to create a new file in the file storage");
122 }
123
124 if (size != 0)
125 {
126 f.write(static_cast<const char*>(content), size);
127 if (!f.good())
128 {
129 f.close();
130 throw OrthancException("Unable to write to the new file in the file storage");
131 }
132 }
133
134 f.close();
135 }
136
137
138 void FilesystemStorage::Read(std::string& content,
139 const std::string& uuid)
140 {
141 content.clear();
142 Toolbox::ReadFile(content, GetPath(uuid).string());
143 }
144
145
146 uintmax_t FilesystemStorage::GetSize(const std::string& uuid) const
147 {
148 boost::filesystem::path path = GetPath(uuid);
149 return boost::filesystem::file_size(path);
150 }
151
152
153
154 void FilesystemStorage::ListAllFiles(std::set<std::string>& result) const
155 {
156 namespace fs = boost::filesystem;
157
158 result.clear();
159
160 if (fs::exists(root_) && fs::is_directory(root_))
161 {
162 for (fs::recursive_directory_iterator current(root_), end; current != end ; ++current)
163 {
164 if (fs::is_regular_file(current->status()))
165 {
166 try
167 {
168 fs::path d = current->path();
169 std::string uuid = ToString(d);
170 if (Toolbox::IsUuid(uuid))
171 {
172 fs::path p0 = d.parent_path().parent_path().parent_path();
173 std::string p1 = ToString(d.parent_path().parent_path());
174 std::string p2 = ToString(d.parent_path());
175 if (p1.length() == 2 &&
176 p2.length() == 2 &&
177 p1 == uuid.substr(0, 2) &&
178 p2 == uuid.substr(2, 2) &&
179 p0 == root_)
180 {
181 result.insert(uuid);
182 }
183 }
184 }
185 catch (fs::filesystem_error)
186 {
187 }
188 }
189 }
190 }
191 }
192
193
194 void FilesystemStorage::Clear()
195 {
196 namespace fs = boost::filesystem;
197 typedef std::set<std::string> List;
198
199 List result;
200 ListAllFiles(result);
201
202 for (List::const_iterator it = result.begin(); it != result.end(); ++it)
203 {
204 Remove(*it);
205 }
206 }
207
208
209 void FilesystemStorage::Remove(const std::string& uuid)
210 {
211 namespace fs = boost::filesystem;
212
213 fs::path p = GetPath(uuid);
214
215 try
216 {
217 fs::remove(p);
218 }
219 catch (...)
220 {
221 // Ignore the error
222 }
223
224 // Remove the two parent directories, ignoring the error code if
225 // these directories are not empty
226
227 try
228 {
229 #if BOOST_HAS_FILESYSTEM_V3 == 1
230 boost::system::error_code err;
231 fs::remove(p.parent_path(), err);
232 fs::remove(p.parent_path().parent_path(), err);
233 #else
234 fs::remove(p.parent_path());
235 fs::remove(p.parent_path().parent_path());
236 #endif
237 }
238 catch (...)
239 {
240 // Ignore the error
241 }
242 }
243
244
245 uintmax_t FilesystemStorage::GetCapacity() const
246 {
247 return boost::filesystem::space(root_).capacity;
248 }
249
250 uintmax_t FilesystemStorage::GetAvailableSpace() const
251 {
252 return boost::filesystem::space(root_).available;
253 }
254 }