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DropCollectionOperation.cs
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DropCollectionOperation.cs
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/* Copyright 2013-present MongoDB Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
using System;
using System.Threading;
using System.Threading.Tasks;
using MongoDB.Bson;
using MongoDB.Bson.Serialization.Serializers;
using MongoDB.Driver.Core.Bindings;
using MongoDB.Driver.Core.Events;
using MongoDB.Driver.Core.Misc;
using MongoDB.Driver.Core.WireProtocol.Messages.Encoders;
using MongoDB.Driver.Encryption;
using static MongoDB.Driver.Encryption.EncryptedCollectionHelper;
namespace MongoDB.Driver.Core.Operations
{
/// <summary>
/// Represents a drop collection operation.
/// </summary>
public class DropCollectionOperation : IWriteOperation<BsonDocument>
{
#region static
internal static IWriteOperation<BsonDocument> CreateEncryptedDropCollectionOperationIfConfigured(
CollectionNamespace collectionNamespace,
BsonDocument encryptedFields,
MessageEncoderSettings messageEncoderSettings,
Action<DropCollectionOperation> configureDropCollectionConfigurator)
{
var mainOperation = new DropCollectionOperation(collectionNamespace, messageEncoderSettings)
{
EncryptedFields = encryptedFields
};
configureDropCollectionConfigurator?.Invoke(mainOperation);
if (encryptedFields != null)
{
return new CompositeWriteOperation<BsonDocument>(
(CreateInnerDropOperation(EncryptedCollectionHelper.GetAdditionalCollectionName(encryptedFields, collectionNamespace, HelperCollectionForEncryption.Esc)), IsMainOperation: false),
(CreateInnerDropOperation(EncryptedCollectionHelper.GetAdditionalCollectionName(encryptedFields, collectionNamespace, HelperCollectionForEncryption.Ecos)), IsMainOperation: false),
(mainOperation, IsMainOperation: true));
}
else
{
return mainOperation;
}
DropCollectionOperation CreateInnerDropOperation(string collectionName)
=> new DropCollectionOperation(new CollectionNamespace(collectionNamespace.DatabaseNamespace.DatabaseName, collectionName), messageEncoderSettings);
}
#endregion
// fields
private readonly CollectionNamespace _collectionNamespace;
private BsonDocument _encryptedFields;
private readonly MessageEncoderSettings _messageEncoderSettings;
private WriteConcern _writeConcern;
// constructors
/// <summary>
/// Initializes a new instance of the <see cref="DropCollectionOperation"/> class.
/// </summary>
/// <param name="collectionNamespace">The collection namespace.</param>
/// <param name="messageEncoderSettings">The message encoder settings.</param>
public DropCollectionOperation(
CollectionNamespace collectionNamespace,
MessageEncoderSettings messageEncoderSettings)
{
_collectionNamespace = Ensure.IsNotNull(collectionNamespace, nameof(collectionNamespace));
_messageEncoderSettings = messageEncoderSettings;
}
// properties
/// <summary>
/// Gets the collection namespace.
/// </summary>
/// <value>
/// The collection namespace.
/// </value>
public CollectionNamespace CollectionNamespace
{
get { return _collectionNamespace; }
}
internal BsonDocument EncryptedFields
{
get { return _encryptedFields; }
private set { _encryptedFields = value; }
}
/// <summary>
/// Gets the message encoder settings.
/// </summary>
/// <value>
/// The message encoder settings.
/// </value>
public MessageEncoderSettings MessageEncoderSettings
{
get { return _messageEncoderSettings; }
}
/// <summary>
/// Gets or sets the write concern.
/// </summary>
/// <value>
/// The write concern.
/// </value>
public WriteConcern WriteConcern
{
get { return _writeConcern; }
set { _writeConcern = value; }
}
// public methods
/// <inheritdoc/>
public BsonDocument Execute(IWriteBinding binding, CancellationToken cancellationToken)
{
Ensure.IsNotNull(binding, nameof(binding));
using (BeginOperation())
using (var channelSource = binding.GetWriteChannelSource(cancellationToken))
using (var channel = channelSource.GetChannel(cancellationToken))
using (var channelBinding = new ChannelReadWriteBinding(channelSource.Server, channel, binding.Session.Fork()))
{
var operation = CreateOperation(channelBinding.Session);
BsonDocument result;
try
{
result = operation.Execute(channelBinding, cancellationToken);
}
catch (MongoCommandException ex)
{
if (!ShouldIgnoreException(ex))
{
throw;
}
result = ex.Result;
}
return result;
}
}
/// <inheritdoc/>
public async Task<BsonDocument> ExecuteAsync(IWriteBinding binding, CancellationToken cancellationToken)
{
Ensure.IsNotNull(binding, nameof(binding));
using (BeginOperation())
using (var channelSource = await binding.GetWriteChannelSourceAsync(cancellationToken).ConfigureAwait(false))
using (var channel = await channelSource.GetChannelAsync(cancellationToken).ConfigureAwait(false))
using (var channelBinding = new ChannelReadWriteBinding(channelSource.Server, channel, binding.Session.Fork()))
{
var operation = CreateOperation(channelBinding.Session);
BsonDocument result;
try
{
result = await operation.ExecuteAsync(channelBinding, cancellationToken).ConfigureAwait(false);
}
catch (MongoCommandException ex)
{
if (!ShouldIgnoreException(ex))
{
throw;
}
result = ex.Result;
}
return result;
}
}
// private methods
internal BsonDocument CreateCommand(ICoreSessionHandle session)
{
var writeConcern = WriteConcernHelper.GetEffectiveWriteConcern(session, _writeConcern);
return new BsonDocument
{
{ "drop", _collectionNamespace.CollectionName },
{ "writeConcern", writeConcern, writeConcern != null }
};
}
private IDisposable BeginOperation() => EventContext.BeginOperation("drop");
private WriteCommandOperation<BsonDocument> CreateOperation(ICoreSessionHandle session)
{
var command = CreateCommand(session);
return new WriteCommandOperation<BsonDocument>(_collectionNamespace.DatabaseNamespace, command, BsonDocumentSerializer.Instance, _messageEncoderSettings);
}
private bool ShouldIgnoreException(MongoCommandException ex)
{
return
ex.Code == (int)ServerErrorCode.NamespaceNotFound ||
ex.ErrorMessage == "ns not found";
}
}
}