FsDiscoverer.cpp 9.34 KB
Newer Older
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22
/*****************************************************************************
 * Media Library
 *****************************************************************************
 * Copyright (C) 2015 Hugo Beauzée-Luyssen, Videolabs
 *
 * Authors: Hugo Beauzée-Luyssen<hugo@beauzee.fr>
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU Lesser General Public License as published by
 * the Free Software Foundation; either version 2.1 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with this program; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
 *****************************************************************************/

23 24
#include "FsDiscoverer.h"

25
#include <algorithm>
Hugo Beauzée-Luyssen's avatar
Hugo Beauzée-Luyssen committed
26 27
#include <queue>

28
#include "factory/FileSystem.h"
Hugo Beauzée-Luyssen's avatar
Hugo Beauzée-Luyssen committed
29
#include "filesystem/IDevice.h"
30
#include "Media.h"
31
#include "File.h"
Hugo Beauzée-Luyssen's avatar
Hugo Beauzée-Luyssen committed
32
#include "Device.h"
33
#include "Folder.h"
Hugo Beauzée-Luyssen's avatar
Hugo Beauzée-Luyssen committed
34
#include "logging/Logger.h"
35
#include "MediaLibrary.h"
36
#include "utils/Filename.h"
37

38
FsDiscoverer::FsDiscoverer( std::shared_ptr<factory::IFileSystem> fsFactory, MediaLibrary* ml, DBConnection dbConn )
39 40
    : m_ml( ml )
    , m_dbConn( dbConn )
41
    , m_fsFactory( fsFactory )
42 43 44
{
}

45
bool FsDiscoverer::discover( const std::string &entryPoint )
46
{
Hugo Beauzée-Luyssen's avatar
Hugo Beauzée-Luyssen committed
47
    LOG_INFO( "Adding to discovery list: ", entryPoint );
48 49 50
    // Assume :// denotes a scheme that isn't a file path, and refuse to discover it.
    if ( entryPoint.find( "://" ) != std::string::npos )
        return false;
51

52 53
    std::shared_ptr<fs::IDirectory> fsDir = m_fsFactory->createDirectory( entryPoint );
    // Otherwise, create a directory and check it for modifications
54 55 56 57 58
    if ( fsDir == nullptr )
    {
        LOG_ERROR("Failed to create an IDirectory for ", entryPoint );
        return false;
    }
59 60 61 62
    auto f = Folder::fromPath( m_dbConn, fsDir->path() );
    // If the folder exists, we assume it will be handled by reload()
    if ( f != nullptr )
        return true;
63
    auto blist = blacklist();
64
    if ( isBlacklisted( *fsDir, blist ) == true )
65
        return false;
66
    return addFolder( *fsDir, nullptr, blist );
67 68
}

69
void FsDiscoverer::reload()
70
{
71 72
    // Start by checking if previously known devices have been plugged/unplugged
    checkDevices();
73
    auto rootFolders = Folder::fetchAll( m_dbConn, 0 );
74
    auto blist = blacklist();
75
    for ( const auto& f : rootFolders )
76
    {
77
        auto folder = m_fsFactory->createDirectory( f->path() );
78 79 80
        if ( folder == nullptr )
        {
            LOG_INFO( "Removing folder ", f->path() );
81
            m_ml->deleteFolder( *f );
82 83
            continue;
        }
84 85
        checkSubfolders( *folder, *f, blist );
        checkFiles( *folder, *f );
86 87 88
    }
}

89 90
void FsDiscoverer::checkDevices()
{
91
    m_fsFactory->refresh();
92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108
    auto devices = Device::fetchAll( m_dbConn );
    for ( auto& d : devices )
    {
        auto deviceFs = m_fsFactory->createDevice( d->uuid() );
        auto fsDevicePresent = deviceFs != nullptr && deviceFs->isPresent();
        if ( d->isPresent() != fsDevicePresent )
        {
            LOG_INFO( "Device ", d->uuid(), " changed presence state: ", d->isPresent(), " -> ", fsDevicePresent );
            d->setPresent( fsDevicePresent );
        }
        else
        {
            LOG_INFO( "Device ", d->uuid(), " unchanged" );
        }
    }
}

109
bool FsDiscoverer::checkSubfolders( fs::IDirectory& parentFolderFs, Folder& parentFolder, const std::vector<std::shared_ptr<Folder>> blacklist ) const
110 111
{
    // Load the folders we already know of:
112
    LOG_INFO( "Checking for modifications in ", parentFolderFs.path() );
113
    auto subFoldersInDB = Folder::fetchAll( m_dbConn, parentFolder.id() );
114
    for ( const auto& subFolderPath : parentFolderFs.dirs() )
115
    {
Hugo Beauzée-Luyssen's avatar
Hugo Beauzée-Luyssen committed
116
        auto subFolder = m_fsFactory->createDirectory( subFolderPath );
117 118
        if ( subFolder == nullptr )
            continue;
Hugo Beauzée-Luyssen's avatar
Hugo Beauzée-Luyssen committed
119

120
        auto it = std::find_if( begin( subFoldersInDB ), end( subFoldersInDB ), [subFolderPath](const std::shared_ptr<Folder>& f) {
121 122 123 124
            return f->path() == subFolderPath;
        });
        // We don't know this folder, it's a new one
        if ( it == end( subFoldersInDB ) )
125
        {
126
            // Check if it is blacklisted
127
            if ( isBlacklisted( *subFolder, blacklist ) == true )
128 129 130 131
            {
                LOG_INFO( "Ignoring blacklisted folder: ", subFolderPath );
                continue;
            }
Hugo Beauzée-Luyssen's avatar
Hugo Beauzée-Luyssen committed
132
            LOG_INFO( "New folder detected: ", subFolderPath );
133
            addFolder( *subFolder, &parentFolder, blacklist );
134
            continue;
135
        }
136
        auto folderInDb = *it;
137 138 139
        // In any case, check for modifications, as a change related to a mountpoint might
        // not update the folder modification date.
        // Also, relying on the modification date probably isn't portable
140 141
        checkSubfolders( *subFolder, *folderInDb, blacklist );
        checkFiles( *subFolder, *folderInDb );
142 143 144 145 146
        subFoldersInDB.erase( it );
    }
    // Now all folders we had in DB but haven't seen from the FS must have been deleted.
    for ( auto f : subFoldersInDB )
    {
147
        LOG_INFO( "Folder ", f->path(), " not found in FS, deleting it" );
148
        m_ml->deleteFolder( *f );
149
    }
150
    LOG_INFO( "Done checking subfolders in ", parentFolderFs.path() );
151 152
    return true;
}
153

154
void FsDiscoverer::checkFiles( fs::IDirectory& parentFolderFs, Folder& parentFolder ) const
155
{
156
    LOG_INFO( "Checking file in ", parentFolderFs.path() );
157
    static const std::string req = "SELECT * FROM " + policy::FileTable::Name
158
            + " WHERE folder_id = ?";
159
    auto files = File::fetchAll<File>( m_dbConn, req, parentFolder.id() );
160 161
    std::vector<std::string> filesToAdd;
    std::vector<std::shared_ptr<File>> filesToRemove;
162
    for ( const auto& filePath : parentFolderFs.files() )
163
    {        
164
        auto it = std::find_if( begin( files ), end( files ), [filePath](const std::shared_ptr<File>& f) {
165 166 167 168
            return f->mrl() == filePath;
        });
        if ( it == end( files ) )
        {
169
            filesToAdd.push_back( filePath );
170
            continue;
171
        }
172 173
        auto fileFs = m_fsFactory->createFile( filePath );
        if ( fileFs->lastModificationDate() == (*it)->lastModificationDate() )
174
        {
175 176 177
            // Unchanged file
            files.erase( it );
            continue;
178
        }
179
        auto& file = (*it);
180
        LOG_INFO( "Forcing file refresh ", filePath );
181 182 183 184 185
        // Pre-cache the file's media, since we need it to remove. However, better doing it
        // out of a write context, since that way, other threads can also read the database.
        file->media();
        filesToRemove.push_back( file );
        filesToAdd.push_back( filePath );
186 187
        files.erase( it );
    }
188
    auto t = m_dbConn->newTransaction();
189 190
    for ( auto file : files )
    {
191
        LOG_INFO( "File ", file->mrl(), " not found on filesystem, deleting it" );
192
        file->media()->removeFile( *file );
193
    }
194 195 196 197 198 199
    for ( auto& f : filesToRemove )
        f->media()->removeFile( *f );
    // Insert all files at once to avoid SQL write contention
    for ( auto& p : filesToAdd )
        m_ml->addFile( p, parentFolder, parentFolderFs );
    t->commit();
200
    LOG_INFO( "Done checking files ", parentFolderFs.path() );
201
}
202 203 204 205 206 207

std::vector<std::shared_ptr<Folder> > FsDiscoverer::blacklist() const
{
    static const std::string req = "SELECT * FROM " + policy::FolderTable::Name + " WHERE is_blacklisted = 1";
    return sqlite::Tools::fetchAll<Folder, Folder>( m_dbConn, req );
}
208

209
bool FsDiscoverer::isBlacklisted( const fs::IDirectory& directory, const std::vector<std::shared_ptr<Folder>>& blacklist ) const
210
{
211
    auto deviceFs = directory.device();
212
    //FIXME: We could avoid fetching the device if the directory is non removable.
213 214 215 216 217 218 219
    auto device = Device::fromUuid( m_dbConn, deviceFs->uuid() );
    // When blacklisting, we would insert the device if we haven't encoutered it yet.
    // So when reading, a missing device means a non-blacklisted device.
    if ( device == nullptr )
        return false;
    auto deviceId = device->id();

220 221
    return std::find_if( begin( blacklist ), end( blacklist ), [&directory, deviceId]( const std::shared_ptr<Folder>& f ) {
        return f->path() == directory.path() && f->deviceId() == deviceId;
222 223
    }) != end( blacklist );
}
224

225
bool FsDiscoverer::addFolder( fs::IDirectory& folder, Folder* parentFolder, const std::vector<std::shared_ptr<Folder>>& blacklist ) const
226
{
227
    auto deviceFs = folder.device();
228 229 230 231
    // We are creating a folder, there has to be a device containing it.
    assert( deviceFs != nullptr );
    auto device = Device::fromUuid( m_dbConn, deviceFs->uuid() );
    if ( device == nullptr )
232
    {
233 234
        LOG_INFO( "Creating new device in DB ", deviceFs->uuid() );
        device = Device::create( m_dbConn, deviceFs->uuid(), deviceFs->isRemovable() );
235 236
    }

237 238
    auto f = Folder::create( m_dbConn, folder.path(),
                             parentFolder != nullptr ? parentFolder->id() : 0,
239
                             *device, *deviceFs );
240 241
    if ( f == nullptr )
        return false;
242 243
    checkFiles( folder, *f );
    checkSubfolders( folder, *f, blacklist );
244 245
    return true;
}
246