62 lines
2.6 KiB
C#
62 lines
2.6 KiB
C#
using System;
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using System.Threading;
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using System.Threading.Tasks;
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using MediaBrowser.Controller.MediaEncoding;
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using Microsoft.Extensions.DependencyInjection;
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using Microsoft.Extensions.Hosting;
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using Microsoft.Extensions.Logging;
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using StackExchange.Redis;
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namespace Emby.Server.Implementations.MediaEncoding;
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/// <summary>
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/// Reports the round trip to the configured Redis transcode session store once at startup, so the
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/// state of cross-pod takeover is visible where the server is started.
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/// </summary>
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/// <remarks>
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/// This reports, it does not gate. <see cref="ApplicationHost.InitializeServices"/> has already read the
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/// same connection for quick connect by the time this runs and has stopped startup if it could not be
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/// reached, so the error branch here only covers a store that went away in between.
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/// </remarks>
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public sealed class TranscodeStoreConnectivityProbe : IHostedService
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{
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private readonly IServiceProvider _serviceProvider;
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private readonly ILogger<TranscodeStoreConnectivityProbe> _logger;
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/// <summary>
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/// Initializes a new instance of the <see cref="TranscodeStoreConnectivityProbe"/> class.
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/// </summary>
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/// <param name="serviceProvider">The service provider used to resolve the Redis connection.</param>
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/// <param name="logger">The logger.</param>
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public TranscodeStoreConnectivityProbe(IServiceProvider serviceProvider, ILogger<TranscodeStoreConnectivityProbe> logger)
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{
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_serviceProvider = serviceProvider;
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_logger = logger;
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}
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/// <inheritdoc />
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public async Task StartAsync(CancellationToken cancellationToken)
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{
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try
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{
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// Resolved here rather than injected so a store lost after the quick connect gate is reported.
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var redis = _serviceProvider.GetRequiredService<IConnectionMultiplexer>();
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var roundTrip = await redis.GetDatabase().PingAsync().ConfigureAwait(false);
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_logger.LogInformation(
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"Redis transcode session store is reachable ({RoundTripMs}ms round trip). HA transcode takeover is active.",
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(long)roundTrip.TotalMilliseconds);
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}
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catch (Exception ex)
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{
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_logger.LogError(
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ex,
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"Redis transcode session store is configured but UNREACHABLE. HA transcode takeover is not working: sessions stay local to this instance and are lost when it restarts. Check {Key}.",
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TranscodeStoreOptions.RedisConnectionStringKey);
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}
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}
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/// <inheritdoc />
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public Task StopAsync(CancellationToken cancellationToken) => Task.CompletedTask;
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}
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