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Merge pull request #25 from ahdde/connection_pooling
Carbon connection pooling
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,184 @@ | ||
| using System; | ||
| using System.Collections.Concurrent; | ||
| using System.IO; | ||
| using System.Net.Sockets; | ||
| using System.Threading; | ||
| using System.Threading.Tasks; | ||
| using Microsoft.Extensions.ObjectPool; | ||
|
|
||
| namespace ahd.Graphite | ||
| { | ||
| /// <summary> | ||
| /// Connection pool for TCP connections to carbon | ||
| /// </summary> | ||
| public class CarbonConnectionPool | ||
| { | ||
| private readonly string _hostname; | ||
| private readonly IGraphiteFormatter _formatter; | ||
| private static readonly ConcurrentDictionary<(string,ushort), ObjectPool<TcpClient>> Cache = new ConcurrentDictionary<(string,ushort), ObjectPool<TcpClient>>(); | ||
| private readonly ObjectPool<TcpClient> _pool; | ||
|
|
||
| /// <summary> | ||
| /// Create or reuse a connection pool for the specified endpoint. If there is already an existing connection pool for the specified endpoint it is reused. | ||
| /// </summary> | ||
| /// <param name="hostname">Graphite hostname</param> | ||
| /// <param name="formatter">formatter for sending data to graphite</param> | ||
| public CarbonConnectionPool(string hostname, IGraphiteFormatter formatter) | ||
| { | ||
| _hostname = hostname; | ||
| _formatter = formatter; | ||
| _pool = Cache.GetOrAdd((hostname, _formatter.Port), CreatePool); | ||
| } | ||
|
|
||
| /// <summary> | ||
| /// clears all connections from all endpoints | ||
| /// </summary> | ||
| public static void ClearAllPools() | ||
| { | ||
| foreach (var entry in Cache) | ||
| { | ||
| if (Cache.TryRemove(entry.Key, out var pool)) | ||
| { | ||
| var disposable = pool as IDisposable; | ||
| disposable?.Dispose(); | ||
| } | ||
| } | ||
| } | ||
|
|
||
| /// <summary> | ||
| /// clears all connections from the current pool | ||
| /// </summary> | ||
| public void ClearPool() | ||
| { | ||
| Cache.TryRemove((_hostname, _formatter.Port), out _); | ||
| var disposable = _pool as IDisposable; | ||
| disposable?.Dispose(); | ||
| } | ||
|
|
||
| /// <summary> | ||
| /// returns a pooled connection or creates a new connection | ||
| /// <remarks>the connection is tested before returning to the caller</remarks> | ||
| /// </summary> | ||
| /// <returns></returns> | ||
| public TcpClient Get() | ||
| { | ||
| var client = _pool.Get(); | ||
| if (!client.Connected) | ||
| { | ||
| client.Dispose(); | ||
| client = new TcpClient(_hostname, _formatter.Port); | ||
| } | ||
| else | ||
| { | ||
| if (!Test(client)) | ||
| return Get(); | ||
| } | ||
| return client; | ||
| } | ||
|
|
||
| /// <summary> | ||
| /// returns the connection to the pool | ||
| /// </summary> | ||
| /// <param name="client">the connection to return to the pool</param> | ||
| public void Return(TcpClient client) | ||
| { | ||
| _pool.Return(client); | ||
| } | ||
|
|
||
| private bool Test(TcpClient client) | ||
| { | ||
| try | ||
| { | ||
| _formatter.TestConnection(client.GetStream()); | ||
| return true; | ||
| } | ||
| catch (IOException ex) when (ex.InnerException is SocketException se && CheckSocketException(se)) | ||
| { | ||
| client.Dispose(); | ||
| return false; | ||
| } | ||
| } | ||
|
|
||
| /// <summary> | ||
| /// returns a pooled connection or creates a new connection | ||
| /// <remarks>the connection is tested before returning to the caller</remarks> | ||
| /// </summary> | ||
| /// <param name="useDualStack">Use ip dual stack for sending metrics</param> | ||
| /// <param name="cancellationToken">The token to monitor for cancellation requests. The default value is <see cref="CancellationToken.None"/>.</param> | ||
| /// <returns></returns> | ||
| public async Task<TcpClient> GetAsync(bool useDualStack, CancellationToken cancellationToken) | ||
| { | ||
| var client = _pool.Get(); | ||
| if (!client.Connected) | ||
| { | ||
| client.Dispose(); | ||
| if (useDualStack) | ||
| { | ||
| client = new TcpClient(AddressFamily.InterNetworkV6) {Client = {DualMode = true}}; | ||
| } | ||
| else | ||
| { | ||
| client = new TcpClient(AddressFamily.InterNetwork); | ||
| } | ||
| cancellationToken.ThrowIfCancellationRequested(); | ||
| await client.ConnectAsync(_hostname, _formatter.Port).ConfigureAwait(false); | ||
| } | ||
| else | ||
| { | ||
| if (!await TestAsync(client, cancellationToken).ConfigureAwait(false)) | ||
| return await GetAsync(useDualStack, cancellationToken).ConfigureAwait(false); | ||
| } | ||
| return client; | ||
| } | ||
|
|
||
| private async Task<bool> TestAsync(TcpClient client, CancellationToken cancellationToken) | ||
| { | ||
| try | ||
| { | ||
| await _formatter.TestConnectionAsync(client.GetStream(), cancellationToken).ConfigureAwait(false); | ||
| return true; | ||
| } | ||
| catch (IOException ex) when (ex.InnerException is SocketException se && CheckSocketException(se)) | ||
| { | ||
| client.Dispose(); | ||
| return false; | ||
| } | ||
| } | ||
|
|
||
| private bool CheckSocketException(SocketException ex) | ||
| { | ||
| if (ex is null) return false; | ||
| switch (ex.SocketErrorCode) | ||
| { | ||
| case SocketError.ConnectionAborted: | ||
| case SocketError.ConnectionReset: | ||
| case SocketError.Disconnecting: | ||
| case SocketError.NetworkReset: | ||
| case SocketError.NotConnected: | ||
| case SocketError.OperationAborted: | ||
| case SocketError.Shutdown: | ||
| return true; | ||
| default: | ||
| return false; | ||
| } | ||
| } | ||
|
|
||
| private ObjectPool<TcpClient> CreatePool((string, ushort) endpoint) | ||
| { | ||
| return new DefaultObjectPoolProvider().Create(new TcpClientPolicy()); | ||
| } | ||
|
|
||
| private class TcpClientPolicy : IPooledObjectPolicy<TcpClient> | ||
| { | ||
| public TcpClient Create() | ||
| { | ||
| return new TcpClient(); | ||
| } | ||
|
|
||
| public bool Return(TcpClient obj) | ||
| { | ||
| return obj.Connected; | ||
| } | ||
| } | ||
| } | ||
| } |
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