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* add NBB.Messaging.JetStream
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24 changes: 24 additions & 0 deletions
24
src/Messaging/NBB.Messaging.JetStream/DependencyInjectionExtensions.cs
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| // Copyright (c) TotalSoft. | ||
| // This source code is licensed under the MIT license. | ||
|
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| using Microsoft.Extensions.Configuration; | ||
| using NBB.Messaging.Abstractions; | ||
| using NBB.Messaging.JetStream; | ||
| using NBB.Messaging.JetStream.Internal; | ||
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| // ReSharper disable once CheckNamespace | ||
| namespace Microsoft.Extensions.DependencyInjection | ||
| { | ||
| public static class DependencyInjectionExtensions | ||
| { | ||
| public static IServiceCollection AddJetStreamTransport(this IServiceCollection services, IConfiguration configuration) | ||
| { | ||
| services.Configure<JetStreamOptions>(configuration.GetSection("Messaging").GetSection("JetStream")); | ||
| services.AddSingleton<JetStreamConnectionProvider>(); | ||
| services.AddSingleton<IMessagingTransport, JetStreamMessagingTransport>(); | ||
| services.AddSingleton<ITransportMonitor>(sp => sp.GetRequiredService<JetStreamConnectionProvider>()); | ||
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| return services; | ||
| } | ||
| } | ||
| } |
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104
src/Messaging/NBB.Messaging.JetStream/Internal/JetStreamConnectionProvider.cs
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| // Copyright (c) TotalSoft. | ||
| // This source code is licensed under the MIT license. | ||
|
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||
| using Microsoft.Extensions.Logging; | ||
| using Microsoft.Extensions.Options; | ||
| using NATS.Client; | ||
| using NBB.Messaging.Abstractions; | ||
| using System; | ||
| using System.Threading; | ||
| using System.Threading.Tasks; | ||
|
|
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| namespace NBB.Messaging.JetStream.Internal | ||
| { | ||
| public class JetStreamConnectionProvider : IDisposable, ITransportMonitor | ||
| { | ||
| private readonly IOptions<JetStreamOptions> _natsOptions; | ||
| private readonly ILogger<JetStreamConnectionProvider> _logger; | ||
| private IConnection _connection; | ||
| private static readonly object InstanceLoker = new(); | ||
| private Exception _unrecoverableException; | ||
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| public event TransportErrorHandler OnError; | ||
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| public JetStreamConnectionProvider(IOptions<JetStreamOptions> natsOptions, ILogger<JetStreamConnectionProvider> logger) | ||
| { | ||
| _natsOptions = natsOptions; | ||
| _logger = logger; | ||
| } | ||
|
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| public async Task ExecuteAsync(Func<IConnection, Task> action) | ||
| { | ||
| var connection = GetAndCheckConnection(); | ||
|
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| await action(connection); | ||
| } | ||
|
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| public void Execute(Action<IConnection> action) | ||
| { | ||
| var connection = GetAndCheckConnection(); | ||
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| action(connection); | ||
| } | ||
|
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| private IConnection GetAndCheckConnection() | ||
| { | ||
| if (_connection == null) | ||
| lock (InstanceLoker) | ||
| { | ||
| if (_connection == null) | ||
| _connection = CreateConnection(); | ||
| } | ||
| return _connection; | ||
| } | ||
|
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| private IConnection CreateConnection() | ||
| { | ||
| var options = ConnectionFactory.GetDefaultOptions(); | ||
| options.Url = _natsOptions.Value.NatsUrl; | ||
|
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| //https://github.com/nats-io/nats.net/issues/804 | ||
| options.AllowReconnect = false; | ||
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| options.ClosedEventHandler += (_, args) => | ||
| { | ||
| SetConnectionLostState(args.Error ?? new Exception("NATS Jetstream connection was lost")); | ||
| }; | ||
|
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| _connection = new ConnectionFactory().CreateConnection(options); | ||
| _logger.LogInformation($"NATS Jetstream connection to {_natsOptions.Value.NatsUrl} was established"); | ||
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| return _connection; | ||
| } | ||
|
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| private void SetConnectionLostState(Exception exception) | ||
| { | ||
| _connection = null; | ||
|
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| // Set the field to the current exception if not already set | ||
| var existingException = Interlocked.CompareExchange(ref _unrecoverableException, exception, null); | ||
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| // Send the application stop signal only once | ||
| if (existingException != null) | ||
| return; | ||
|
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| _logger.LogError(exception, "NATS Jetstream connection unrecoverable"); | ||
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| OnError?.Invoke(exception); | ||
| } | ||
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| public void Dispose() | ||
| { | ||
| Dispose(true); | ||
| GC.SuppressFinalize(this); | ||
| } | ||
|
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| protected virtual void Dispose(bool disposing) | ||
| { | ||
| if (disposing) | ||
| { | ||
| _connection?.Dispose(); | ||
| } | ||
| } | ||
| } | ||
| } |
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97
src/Messaging/NBB.Messaging.JetStream/JetStreamMessagingTransport.cs
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| // Copyright (c) TotalSoft. | ||
| // This source code is licensed under the MIT license. | ||
|
|
||
| using Microsoft.Extensions.Options; | ||
| using NATS.Client; | ||
| using NATS.Client.JetStream; | ||
| using NBB.Messaging.Abstractions; | ||
| using NBB.Messaging.JetStream.Internal; | ||
| using System; | ||
| using System.Threading; | ||
| using System.Threading.Tasks; | ||
|
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| namespace NBB.Messaging.JetStream | ||
| { | ||
| public class JetStreamMessagingTransport : IMessagingTransport | ||
| { | ||
| private readonly IOptions<JetStreamOptions> _natsOptions; | ||
| private readonly JetStreamConnectionProvider _natsConnectionManager; | ||
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| public JetStreamMessagingTransport(IOptions<JetStreamOptions> natsOptions, JetStreamConnectionProvider natsConnectionManager) | ||
| { | ||
| _natsOptions = natsOptions; | ||
| _natsConnectionManager = natsConnectionManager; | ||
| } | ||
|
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| public Task PublishAsync(string topic, TransportSendContext sendContext, CancellationToken cancellationToken = default) | ||
| { | ||
| var envelopeData = sendContext.EnvelopeBytesAccessor.Invoke(); | ||
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| return _natsConnectionManager.ExecuteAsync(con => | ||
| { | ||
| IJetStream js = con.CreateJetStreamContext(); | ||
| return js.PublishAsync(topic, envelopeData); | ||
| }); | ||
| } | ||
|
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| public Task<IDisposable> SubscribeAsync(string topic, | ||
| Func<TransportReceiveContext, Task> handler, | ||
| SubscriptionTransportOptions options = null, | ||
| CancellationToken cancellationToken = default) | ||
| { | ||
|
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| IDisposable consumer = null; | ||
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| _natsConnectionManager.Execute(con => | ||
| { | ||
| IJetStream js = con.CreateJetStreamContext(); | ||
| // set's up the stream | ||
| var isCommand = topic.ToLower().Contains("commands."); | ||
| var stream = isCommand ? _natsOptions.Value.CommandsStream : _natsOptions.Value.EventsStream; | ||
| var jsm = con.CreateJetStreamManagementContext(); | ||
| jsm.GetStreamInfo(stream); | ||
| // get stream context, create consumer and get the consumer context | ||
| var streamContext = con.GetStreamContext(stream); | ||
| var subscriberOptions = options ?? SubscriptionTransportOptions.Default; | ||
| var ccb = ConsumerConfiguration.Builder(); | ||
| if (subscriberOptions.IsDurable) | ||
| { | ||
| var clientId = (_natsOptions.Value.ClientId + topic).Replace(".", "_"); | ||
| ccb.WithDurable(clientId); | ||
| } | ||
| if (subscriberOptions.DeliverNewMessagesOnly) | ||
| ccb.WithDeliverPolicy(DeliverPolicy.New); | ||
| else | ||
| ccb.WithDeliverPolicy(DeliverPolicy.All); | ||
| ccb.WithAckWait(subscriberOptions.AckWait ?? _natsOptions.Value.AckWait ?? 50000); | ||
| //https://docs.nats.io/nats-concepts/jetstream/consumers#maxackpending | ||
| ccb.WithMaxAckPending(subscriberOptions.MaxConcurrentMessages); | ||
| ccb.WithFilterSubject(topic); | ||
| var consumerContext = streamContext.CreateOrUpdateConsumer(ccb.Build()); | ||
| void NatsMsgHandler(object obj, MsgHandlerEventArgs args) | ||
| { | ||
| if (cancellationToken.IsCancellationRequested) | ||
| return; | ||
| var receiveContext = new TransportReceiveContext(new TransportReceivedData.EnvelopeBytes(args.Message.Data)); | ||
| // Fire and forget | ||
| _ = handler(receiveContext).ContinueWith(_ => args.Message.Ack(), cancellationToken); | ||
| } | ||
| consumer = consumerContext.Consume(NatsMsgHandler); | ||
| }); | ||
| return Task.FromResult(consumer); | ||
| } | ||
| } | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,26 @@ | ||
| // Copyright (c) TotalSoft. | ||
| // This source code is licensed under the MIT license. | ||
|
|
||
| namespace NBB.Messaging.JetStream | ||
| { | ||
| public class JetStreamOptions | ||
| { | ||
| /// <summary> | ||
| /// URL of the Streaming NATS cluster | ||
| /// </summary> | ||
| public string NatsUrl { get; set; } | ||
|
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| /// <summary> | ||
| /// Identifier of the Streaming NATS client | ||
| /// </summary> | ||
| public string ClientId { get; set; } | ||
|
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| /// <summary> | ||
| /// The time the server awaits for acknowledgement from the client before redelivering the message (in milliseconds) | ||
| /// </summary> | ||
| public int? AckWait { get; set; } | ||
| public string CommandsStream { get; set; } | ||
| public string EventsStream { get; set; } | ||
|
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| } | ||
| } |
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