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SnapshotObservable.cs
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SnapshotObservable.cs
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/* SPDX-License-Identifier: Apache-2.0
*
* The OpenSearch Contributors require contributions made to
* this file be licensed under the Apache-2.0 license or a
* compatible open source license.
*/
/*
* Modifications Copyright OpenSearch Contributors. See
* GitHub history for details.
*
* Licensed to Elasticsearch B.V. under one or more contributor
* license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright
* ownership. Elasticsearch B.V. licenses this file to you 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.Diagnostics;
using System.Linq;
using System.Threading;
using OpenSearch.Net;
namespace OpenSearch.Client
{
public class SnapshotObservable : IDisposable, IObservable<SnapshotStatusResponse>
{
private readonly IOpenSearchClient _opensearchClient;
private readonly TimeSpan _interval = TimeSpan.FromSeconds(2);
private readonly ISnapshotRequest _snapshotRequest;
private readonly SnapshotStatusHumbleObject _snapshotStatusHumbleObject;
private EventHandler<SnapshotCompletedEventArgs> _completedEventHandler;
private bool _disposed;
private EventHandler<SnapshotErrorEventArgs> _errorEventHandler;
private EventHandler<SnapshotNextEventArgs> _nextEventHandler;
private Timer _timer;
public SnapshotObservable(IOpenSearchClient opensearchClient, ISnapshotRequest snapshotRequest)
{
opensearchClient.ThrowIfNull(nameof(opensearchClient));
snapshotRequest.ThrowIfNull(nameof(snapshotRequest));
_opensearchClient = opensearchClient;
_snapshotRequest = snapshotRequest;
_snapshotRequest.RequestParameters.SetRequestMetaData(RequestMetaDataFactory.SnapshotHelperRequestMetaData());
_snapshotStatusHumbleObject = new SnapshotStatusHumbleObject(opensearchClient, snapshotRequest);
_snapshotStatusHumbleObject.Completed += StopTimer;
_snapshotStatusHumbleObject.Error += StopTimer;
}
public SnapshotObservable(IOpenSearchClient opensearchClient, ISnapshotRequest snapshotRequest, TimeSpan interval)
: this(opensearchClient, snapshotRequest)
{
interval.ThrowIfNull(nameof(interval));
if (interval.Ticks < 0) throw new ArgumentOutOfRangeException(nameof(interval));
_interval = interval;
}
public void Dispose() => Dispose(true);
public IDisposable Subscribe(IObserver<SnapshotStatusResponse> observer)
{
observer.ThrowIfNull(nameof(observer));
try
{
_snapshotRequest.RequestParameters.WaitForCompletion = false;
var snapshotResponse = _opensearchClient.Snapshot.Snapshot(_snapshotRequest);
if (!snapshotResponse.IsValid)
throw new OpenSearchClientException(PipelineFailure.BadResponse, "Failed to create snapshot.", snapshotResponse.ApiCall);
EventHandler<SnapshotNextEventArgs> onNext = (sender, args) => observer.OnNext(args.SnapshotStatusResponse);
EventHandler<SnapshotCompletedEventArgs> onCompleted = (sender, args) => observer.OnCompleted();
EventHandler<SnapshotErrorEventArgs> onError = (sender, args) => observer.OnError(args.Exception);
_nextEventHandler = onNext;
_completedEventHandler = onCompleted;
_errorEventHandler = onError;
_snapshotStatusHumbleObject.Next += onNext;
_snapshotStatusHumbleObject.Completed += onCompleted;
_snapshotStatusHumbleObject.Error += onError;
_timer = new Timer(Snapshot, observer, _interval, Timeout.InfiniteTimeSpan);
}
catch (Exception exception)
{
observer.OnError(exception);
}
return this;
}
private void Snapshot(object state)
{
var observer = state as IObserver<SnapshotStatusResponse>;
if (observer == null) throw new ArgumentException("state");
try
{
var watch = new Stopwatch();
watch.Start();
_snapshotStatusHumbleObject.CheckStatus();
_timer.Change(TimeSpan.FromMilliseconds(Math.Max(0, _interval.TotalMilliseconds - watch.ElapsedMilliseconds)),
Timeout.InfiniteTimeSpan);
}
catch (Exception exception)
{
observer.OnError(exception);
StopTimer(null, null);
}
}
private void StopTimer(object sender, EventArgs restoreCompletedEventArgs) => _timer.Change(Timeout.Infinite, Timeout.Infinite);
protected virtual void Dispose(bool disposing)
{
if (_disposed) return;
_timer?.Dispose();
if (_snapshotStatusHumbleObject != null)
{
_snapshotStatusHumbleObject.Next -= _nextEventHandler;
_snapshotStatusHumbleObject.Completed -= _completedEventHandler;
_snapshotStatusHumbleObject.Error -= _errorEventHandler;
_snapshotStatusHumbleObject.Completed -= StopTimer;
_snapshotStatusHumbleObject.Error -= StopTimer;
}
_disposed = true;
}
~SnapshotObservable() => Dispose(false);
}
public class SnapshotNextEventArgs : EventArgs
{
public SnapshotNextEventArgs(SnapshotStatusResponse snapshotStatusResponse) => SnapshotStatusResponse = snapshotStatusResponse;
public SnapshotStatusResponse SnapshotStatusResponse { get; }
}
public class SnapshotCompletedEventArgs : EventArgs
{
public SnapshotCompletedEventArgs(SnapshotStatusResponse snapshotStatusResponse) => SnapshotStatusResponse = snapshotStatusResponse;
public SnapshotStatusResponse SnapshotStatusResponse { get; private set; }
}
public class SnapshotErrorEventArgs : EventArgs
{
public SnapshotErrorEventArgs(Exception exception) => Exception = exception;
public Exception Exception { get; }
}
public class SnapshotStatusHumbleObject
{
private readonly IOpenSearchClient _opensearchClient;
private readonly ISnapshotRequest _snapshotRequest;
public SnapshotStatusHumbleObject(IOpenSearchClient opensearchClient, ISnapshotRequest snapshotRequest)
{
opensearchClient.ThrowIfNull(nameof(opensearchClient));
snapshotRequest.ThrowIfNull(nameof(snapshotRequest));
_opensearchClient = opensearchClient;
_snapshotRequest = snapshotRequest;
}
public event EventHandler<SnapshotCompletedEventArgs> Completed;
public event EventHandler<SnapshotErrorEventArgs> Error;
public event EventHandler<SnapshotNextEventArgs> Next;
public void CheckStatus()
{
try
{
var snapshotRequest = new SnapshotStatusRequest(_snapshotRequest.RepositoryName, _snapshotRequest.Snapshot)
{
RequestConfiguration = new RequestConfiguration()
};
snapshotRequest.RequestConfiguration.SetRequestMetaData(RequestMetaDataFactory.SnapshotHelperRequestMetaData());
var snapshotStatusResponse =
_opensearchClient.Snapshot.Status(snapshotRequest);
if (!snapshotStatusResponse.IsValid)
throw new OpenSearchClientException(PipelineFailure.BadResponse, "Failed to get snapshot status.",
snapshotStatusResponse.ApiCall);
if (snapshotStatusResponse.Snapshots.All(s => s.ShardsStats.Done == s.ShardsStats.Total))
{
OnCompleted(new SnapshotCompletedEventArgs(snapshotStatusResponse));
return;
}
OnNext(new SnapshotNextEventArgs(snapshotStatusResponse));
}
catch (Exception exception)
{
OnError(new SnapshotErrorEventArgs(exception));
}
}
protected virtual void OnNext(SnapshotNextEventArgs nextEventArgs)
{
var handler = Next;
handler?.Invoke(this, nextEventArgs);
}
protected virtual void OnCompleted(SnapshotCompletedEventArgs completedEventArgs)
{
var handler = Completed;
handler?.Invoke(this, completedEventArgs);
}
protected virtual void OnError(SnapshotErrorEventArgs errorEventArgs)
{
var handler = Error;
handler?.Invoke(this, errorEventArgs);
}
}
}