mirror of https://github.com/Squidex/squidex.git
Sebastian Stehle
8 years ago
5 changed files with 166 additions and 152 deletions
@ -1,152 +0,0 @@ |
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// ==========================================================================
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// GetEventStoreSubscription.cs
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// Squidex Headless CMS
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// ==========================================================================
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// Copyright (c) Squidex Group
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// All rights reserved.
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// ==========================================================================
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using System; |
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using System.Collections.Concurrent; |
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using System.Globalization; |
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using System.Linq; |
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using System.Net; |
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using System.Net.Sockets; |
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using System.Threading.Tasks; |
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using EventStore.ClientAPI; |
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using EventStore.ClientAPI.Exceptions; |
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using EventStore.ClientAPI.Projections; |
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using Squidex.Infrastructure.Tasks; |
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namespace Squidex.Infrastructure.EventSourcing |
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{ |
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internal sealed class GetEventStoreSubscription : IEventSubscription |
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{ |
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private const string ProjectionName = "by-{0}-{1}"; |
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private static readonly ConcurrentDictionary<string, bool> SubscriptionsCreated = new ConcurrentDictionary<string, bool>(); |
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private readonly IEventStoreConnection eventStoreConnection; |
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private readonly IEventSubscriber eventSubscriber; |
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private readonly string prefix; |
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private readonly string streamFilter; |
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private readonly string projectionHost; |
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private readonly EventStoreCatchUpSubscription subscription; |
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private readonly long? position; |
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public GetEventStoreSubscription( |
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IEventStoreConnection eventStoreConnection, |
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IEventSubscriber eventSubscriber, |
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string projectionHost, |
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string prefix, |
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string position, |
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string streamFilter) |
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{ |
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Guard.NotNull(eventSubscriber, nameof(eventSubscriber)); |
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Guard.NotNullOrEmpty(streamFilter, nameof(streamFilter)); |
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this.eventStoreConnection = eventStoreConnection; |
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this.eventSubscriber = eventSubscriber; |
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this.position = ParsePosition(position); |
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this.prefix = prefix; |
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this.projectionHost = projectionHost; |
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this.streamFilter = streamFilter; |
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var streamName = ParseFilter(prefix, streamFilter); |
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InitializeAsync(streamName).Wait(); |
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subscription = SubscribeToStream(streamName); |
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} |
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public Task StopAsync() |
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{ |
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subscription.Stop(); |
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return TaskHelper.Done; |
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} |
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private EventStoreCatchUpSubscription SubscribeToStream(string streamName) |
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{ |
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var settings = CatchUpSubscriptionSettings.Default; |
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return eventStoreConnection.SubscribeToStreamFrom(streamName, position, settings, |
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(s, e) => |
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{ |
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var storedEvent = Formatter.Read(e); |
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eventSubscriber.OnEventAsync(this, storedEvent).Wait(); |
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}, null, |
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(s, reason, ex) => |
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{ |
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if (reason != SubscriptionDropReason.ConnectionClosed && |
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reason != SubscriptionDropReason.UserInitiated) |
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{ |
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ex = ex ?? new ConnectionClosedException($"Subscription closed with reason {reason}."); |
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eventSubscriber.OnErrorAsync(this, ex); |
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} |
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}); |
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} |
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private async Task InitializeAsync(string streamName) |
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{ |
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if (SubscriptionsCreated.TryAdd(streamName, true)) |
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{ |
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var projectsManager = await ConnectToProjections(); |
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var projectionConfig = |
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$@"fromAll()
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.when({{ |
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$any: function (s, e) {{ |
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if (e.streamId.indexOf('{prefix}') === 0 && /{streamFilter}/.test(e.streamId.substring({prefix.Length + 1}))) {{ |
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linkTo('{streamName}', e); |
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}} |
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}} |
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}});";
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try |
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{ |
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var credentials = eventStoreConnection.Settings.DefaultUserCredentials; |
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await projectsManager.CreateContinuousAsync($"${streamName}", projectionConfig, credentials); |
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} |
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catch (Exception ex) |
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{ |
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if (!ex.Is<ProjectionCommandConflictException>()) |
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{ |
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throw; |
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} |
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} |
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} |
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} |
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private async Task<ProjectionsManager> ConnectToProjections() |
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{ |
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var addressParts = projectionHost.Split(':'); |
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if (addressParts.Length < 2 || !int.TryParse(addressParts[1], out var port)) |
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{ |
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port = 2113; |
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} |
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var endpoints = await Dns.GetHostAddressesAsync(addressParts[0]); |
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var endpoint = new IPEndPoint(endpoints.First(x => x.AddressFamily == AddressFamily.InterNetwork), port); |
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var projectionsManager = |
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new ProjectionsManager( |
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eventStoreConnection.Settings.Log, endpoint, |
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eventStoreConnection.Settings.OperationTimeout); |
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return projectionsManager; |
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} |
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private static string ParseFilter(string prefix, string filter) |
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{ |
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return string.Format(CultureInfo.InvariantCulture, ProjectionName, prefix.Simplify(), filter.Simplify()); |
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} |
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private static long? ParsePosition(string position) |
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{ |
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return long.TryParse(position, out var parsedPosition) ? (long?)parsedPosition : null; |
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} |
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} |
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} |
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@ -0,0 +1,78 @@ |
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// ==========================================================================
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// GetEventStoreSubscription.cs
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// Squidex Headless CMS
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// ==========================================================================
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// Copyright (c) Squidex Group
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// All rights reserved.
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// ==========================================================================
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using System.Threading.Tasks; |
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using EventStore.ClientAPI; |
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using EventStore.ClientAPI.Exceptions; |
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using Squidex.Infrastructure.Tasks; |
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namespace Squidex.Infrastructure.EventSourcing |
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{ |
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internal sealed class GetEventStoreSubscription : IEventSubscription |
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{ |
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private readonly IEventStoreConnection eventStoreConnection; |
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private readonly IEventSubscriber eventSubscriber; |
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private readonly EventStoreCatchUpSubscription subscription; |
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private readonly long? position; |
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public GetEventStoreSubscription( |
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IEventStoreConnection eventStoreConnection, |
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IEventSubscriber eventSubscriber, |
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string projectionHost, |
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string prefix, |
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string position, |
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string streamFilter) |
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{ |
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Guard.NotNull(eventSubscriber, nameof(eventSubscriber)); |
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Guard.NotNullOrEmpty(streamFilter, nameof(streamFilter)); |
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this.eventStoreConnection = eventStoreConnection; |
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this.eventSubscriber = eventSubscriber; |
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this.position = ParsePosition(position); |
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var streamName = eventStoreConnection.CreateProjectionAsync(projectionHost, prefix, streamFilter).Result; |
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subscription = SubscribeToStream(streamName); |
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} |
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public Task StopAsync() |
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{ |
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subscription.Stop(); |
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return TaskHelper.Done; |
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} |
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private EventStoreCatchUpSubscription SubscribeToStream(string streamName) |
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{ |
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var settings = CatchUpSubscriptionSettings.Default; |
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return eventStoreConnection.SubscribeToStreamFrom(streamName, position, settings, |
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(s, e) => |
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{ |
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var storedEvent = Formatter.Read(e); |
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eventSubscriber.OnEventAsync(this, storedEvent).Wait(); |
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}, null, |
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(s, reason, ex) => |
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{ |
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if (reason != SubscriptionDropReason.ConnectionClosed && |
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reason != SubscriptionDropReason.UserInitiated) |
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{ |
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ex = ex ?? new ConnectionClosedException($"Subscription closed with reason {reason}."); |
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eventSubscriber.OnErrorAsync(this, ex); |
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} |
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}); |
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} |
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private static long? ParsePosition(string position) |
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{ |
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return long.TryParse(position, out var parsedPosition) ? (long?)parsedPosition : null; |
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} |
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} |
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} |
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@ -0,0 +1,88 @@ |
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// ==========================================================================
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// ProjectionHelper.cs
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// Squidex Headless CMS
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// ==========================================================================
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// Copyright (c) Squidex Group
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// All rights reserved.
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// ==========================================================================
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using System; |
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using System.Collections.Concurrent; |
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using System.Globalization; |
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using System.Linq; |
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using System.Net; |
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using System.Net.Sockets; |
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using System.Threading.Tasks; |
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using EventStore.ClientAPI; |
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using EventStore.ClientAPI.Exceptions; |
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using EventStore.ClientAPI.Projections; |
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namespace Squidex.Infrastructure.EventSourcing |
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{ |
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public static class ProjectionHelper |
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{ |
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private const string ProjectionName = "by-{0}-{1}"; |
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private static readonly ConcurrentDictionary<string, bool> SubscriptionsCreated = new ConcurrentDictionary<string, bool>(); |
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private static string ParseFilter(string prefix, string filter) |
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{ |
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return string.Format(CultureInfo.InvariantCulture, ProjectionName, prefix.Simplify(), filter.Simplify()); |
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} |
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public static async Task<string> CreateProjectionAsync(this IEventStoreConnection connection, string projectionHost, string prefix, string streamFilter = null) |
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{ |
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var streamName = ParseFilter(prefix, streamFilter); |
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if (SubscriptionsCreated.TryAdd(streamName, true)) |
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{ |
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var projectsManager = await ConnectToProjections(connection, projectionHost); |
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var projectionConfig = |
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$@"fromAll()
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.when({{ |
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$any: function (s, e) {{ |
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if (e.streamId.indexOf('{prefix}') === 0 && /{streamFilter}/.test(e.streamId.substring({prefix.Length + 1}))) {{ |
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linkTo('{streamName}', e); |
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}} |
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}} |
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}});";
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try |
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{ |
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var credentials = connection.Settings.DefaultUserCredentials; |
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await projectsManager.CreateContinuousAsync($"${streamName}", projectionConfig, credentials); |
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} |
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catch (Exception ex) |
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{ |
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if (!ex.Is<ProjectionCommandConflictException>()) |
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{ |
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throw; |
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} |
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} |
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} |
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return streamName; |
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} |
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private static async Task<ProjectionsManager> ConnectToProjections(IEventStoreConnection connection, string projectionHost) |
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{ |
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var addressParts = projectionHost.Split(':'); |
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if (addressParts.Length < 2 || !int.TryParse(addressParts[1], out var port)) |
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{ |
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port = 2113; |
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} |
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var endpoints = await Dns.GetHostAddressesAsync(addressParts[0]); |
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var endpoint = new IPEndPoint(endpoints.First(x => x.AddressFamily == AddressFamily.InterNetwork), port); |
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var projectionsManager = |
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new ProjectionsManager( |
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connection.Settings.Log, endpoint, |
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connection.Settings.OperationTimeout); |
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return projectionsManager; |
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} |
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} |
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} |
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