/// <summary>
/// Refreshes the GridFS file info from the server.
/// </summary>
public void Refresh()
{
using (_server.RequestStart(_serverInstance))
{
var gridFS = new MongoGridFS(_server, _databaseName, _settings);
var database = gridFS.GetDatabase();
var filesCollection = gridFS.GetFilesCollection(database);
MongoCursor <BsonDocument> cursor;
if (_id != null)
{
cursor = filesCollection.Find(Query.EQ("_id", _id));
}
else if (_name != null)
{
cursor = filesCollection.Find(Query.EQ("filename", _name)).SetSortOrder(SortBy.Descending("uploadDate"));
}
else
{
throw new InvalidOperationException("Cannot refresh FileInfo when both Id and Name are missing.");
}
var fileInfo = cursor.SetLimit(1).FirstOrDefault();
CacheFileInfo(fileInfo); // fileInfo will be null if file does not exist
}
}
private void UpdateMetadata()
{
using (_fileInfo.Server.RequestStart(null, ReadPreference.Primary))
{
var gridFS = new MongoGridFS(_fileInfo.Server, _fileInfo.DatabaseName, _fileInfo.GridFSSettings);
var database = gridFS.GetDatabase(ReadPreference.Primary);
var filesCollection = gridFS.GetFilesCollection(database);
BsonValue md5 = BsonNull.Value;
if (_updateMD5)
{
var md5Command = new CommandDocument
{
{ "filemd5", _fileInfo.Id },
{ "root", gridFS.Settings.Root }
};
var md5Result = database.RunCommand(md5Command);
md5 = md5Result.Response["md5"].AsString;
}
var query = Query.EQ("_id", _fileInfo.Id);
var update = Update
.Set("length", _length)
.Set("md5", md5);
filesCollection.Update(query, update);
}
}
/// <summary>
/// Moves the most recent version of a GridFS file.
/// </summary>
/// <param name="destFileName">The destination file name.</param>
public void MoveTo(string destFileName)
{
EnsureServerInstanceIsPrimary();
using (_server.RequestStart(_serverInstance))
{
var gridFS = new MongoGridFS(_server, _databaseName, _settings);
var database = gridFS.GetDatabase(ReadPreference.Primary);
var filesCollection = gridFS.GetFilesCollection(database);
var query = Query.EQ("_id", _id);
var update = Update.Set("filename", destFileName);
filesCollection.Update(query, update);
}
}
/// <summary>
/// Deletes a GridFS file.
/// </summary>
public void Delete()
{
EnsureServerInstanceIsPrimary();
using (_server.RequestStart(_serverInstance))
{
var gridFS = new MongoGridFS(_server, _databaseName, _settings);
gridFS.EnsureIndexes();
if (Exists)
{
var database = gridFS.GetDatabase(ReadPreference.Primary);
var filesCollection = gridFS.GetFilesCollection(database);
var chunksCollection = gridFS.GetChunksCollection(database);
filesCollection.Remove(Query.EQ("_id", _id), gridFS.Settings.WriteConcern);
chunksCollection.Remove(Query.EQ("files_id", _id), gridFS.Settings.WriteConcern);
}
}
}
private void OpenCreate()
{
EnsureServerInstanceIsPrimary();
using (_fileInfo.Server.RequestStart(null, _fileInfo.ServerInstance))
{
var gridFS = new MongoGridFS(_fileInfo.Server, _fileInfo.DatabaseName, _fileInfo.GridFSSettings);
var database = gridFS.GetDatabase(ReadPreference.Primary);
var filesCollection = gridFS.GetFilesCollection(database);
gridFS.EnsureIndexes();
_fileIsDirty = true;
if (_fileInfo.Id == null)
{
_fileInfo.SetId(ObjectId.GenerateNewId());
}
var aliases = (_fileInfo.Aliases != null) ? new BsonArray(_fileInfo.Aliases) : null;
var file = new BsonDocument
{
{ "_id", _fileInfo.Id },
{ "filename", _fileInfo.Name, !string.IsNullOrEmpty(_fileInfo.Name) },
{ "length", 0 },
{ "chunkSize", _fileInfo.ChunkSize },
{ "uploadDate", _fileInfo.UploadDate },
{ "md5", BsonNull.Value }, // will be updated when the file is closed (unless UpdateMD5 is false)
{ "contentType", _fileInfo.ContentType, !string.IsNullOrEmpty(_fileInfo.ContentType) }, // optional
{ "aliases", aliases, aliases != null }, // optional
{ "metadata", _fileInfo.Metadata, _fileInfo.Metadata != null } // optional
};
filesCollection.Insert(file);
_length = 0;
_position = 0;
}
}
private void UpdateMetadata()
{
using (_fileInfo.Server.RequestStart(null, ReadPreference.Primary))
{
var gridFS = new MongoGridFS(_fileInfo.Server, _fileInfo.DatabaseName, _fileInfo.GridFSSettings);
var database = gridFS.GetDatabase(ReadPreference.Primary);
var filesCollection = gridFS.GetFilesCollection(database);
BsonValue md5 = BsonNull.Value;
if (_updateMD5)
{
var md5Command = new CommandDocument
{
{ "filemd5", _fileInfo.Id },
{ "root", gridFS.Settings.Root }
};
var md5Result = database.RunCommand(md5Command);
md5 = md5Result.Response["md5"].AsString;
}
var query = Query.EQ("_id", _fileInfo.Id);
var update = Update
.Set("length", _length)
.Set("md5", md5);
filesCollection.Update(query, update);
}
}
private void OpenCreate()
{
EnsureServerInstanceIsPrimary();
using (_fileInfo.Server.RequestStart(null, _fileInfo.ServerInstance))
{
var gridFS = new MongoGridFS(_fileInfo.Server, _fileInfo.DatabaseName, _fileInfo.GridFSSettings);
var database = gridFS.GetDatabase(ReadPreference.Primary);
var filesCollection = gridFS.GetFilesCollection(database);
gridFS.EnsureIndexes();
_fileIsDirty = true;
if (_fileInfo.Id == null)
{
_fileInfo.SetId(ObjectId.GenerateNewId());
}
var aliases = (_fileInfo.Aliases != null) ? new BsonArray(_fileInfo.Aliases) : null;
var file = new BsonDocument
{
{ "_id", _fileInfo.Id },
{ "filename", _fileInfo.Name, !string.IsNullOrEmpty(_fileInfo.Name) },
{ "length", 0 },
{ "chunkSize", _fileInfo.ChunkSize },
{ "uploadDate", _fileInfo.UploadDate },
{ "md5", BsonNull.Value }, // will be updated when the file is closed (unless UpdateMD5 is false)
{ "contentType", _fileInfo.ContentType, !string.IsNullOrEmpty(_fileInfo.ContentType) }, // optional
{ "aliases", aliases, aliases != null }, // optional
{ "metadata", _fileInfo.Metadata, _fileInfo.Metadata != null } // optional
};
filesCollection.Insert(file);
_length = 0;
_position = 0;
}
}
