unkin-agent
baa16b6586
Cleanup never matched a live session because the controller registered empty manifest and segment paths, renewal was a read-modify-write that could revert a takeover, and the takeover script compared an ISO date to a number, so it errored. - populate the session record's manifest and segment paths from the playlist path - renew the lease via a Lua compare-and-set on the owning pod - store the lease expiry as unix milliseconds so the scripts can compare it - retain the session record past its lease so an orphan can still be taken over - test the Redis store against a real Redis, including the renew-vs-takeover race - drop the live stream record nothing ever read back
87 lines
3.4 KiB
C#
87 lines
3.4 KiB
C#
using System;
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using System.IO;
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namespace MediaBrowser.Controller.MediaEncoding;
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/// <summary>
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/// Represents a durable record of an HLS transcoding session for HA pod recovery.
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/// </summary>
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public sealed class TranscodeSession
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{
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/// <summary>
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/// Gets or sets the unique play session identifier.
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/// </summary>
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public string PlaySessionId { get; set; } = string.Empty;
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/// <summary>
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/// Gets or sets the name of the pod that currently owns this session's lease.
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/// </summary>
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public string OwnerPod { get; set; } = string.Empty;
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/// <summary>
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/// Gets or sets the UTC time at which the owning pod's lease expires.
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/// </summary>
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public DateTime LeaseExpiresUtc { get; set; }
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/// <summary>
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/// Gets or sets the absolute path to the HLS manifest (.m3u8) file on shared storage.
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/// </summary>
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public string ManifestPath { get; set; } = string.Empty;
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/// <summary>
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/// Gets or sets the path prefix for transcoded segment files on shared storage.
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/// </summary>
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public string SegmentPathPrefix { get; set; } = string.Empty;
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/// <summary>
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/// Gets or sets the media source identifier associated with this session.
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/// </summary>
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public string MediaSourceId { get; set; } = string.Empty;
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/// <summary>
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/// Gets or sets the zero-based index of the last segment that was fully written to durable storage.
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/// </summary>
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public int LastCompletedSegmentIndex { get; set; }
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/// <summary>
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/// Gets or sets the last durable playback offset in ticks, used to resume playback after failover.
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/// </summary>
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public long LastDurablePlaybackOffset { get; set; }
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/// <summary>
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/// Creates a session record for an HLS output, deriving <see cref="ManifestPath"/> and
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/// <see cref="SegmentPathPrefix"/> from the playlist path so that cleanup can recognise
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/// every file the session owns.
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/// </summary>
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/// <param name="playSessionId">The play session identifier.</param>
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/// <param name="mediaSourceId">The media source identifier.</param>
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/// <param name="ownerPod">The name of the pod that owns the session.</param>
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/// <param name="playlistPath">The absolute path of the HLS playlist (.m3u8) file.</param>
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/// <param name="leaseDuration">The initial lease duration.</param>
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/// <returns>The new <see cref="TranscodeSession"/>.</returns>
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public static TranscodeSession CreateForPlaylist(
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string playSessionId,
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string mediaSourceId,
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string ownerPod,
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string playlistPath,
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TimeSpan leaseDuration)
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=> new TranscodeSession
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{
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PlaySessionId = playSessionId,
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OwnerPod = ownerPod,
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LeaseExpiresUtc = DateTime.UtcNow.Add(leaseDuration),
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ManifestPath = playlistPath,
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SegmentPathPrefix = GetSegmentPathPrefix(playlistPath),
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MediaSourceId = mediaSourceId,
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};
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/// <summary>
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/// Gets the prefix every segment file of the HLS output at <paramref name="playlistPath"/> starts with.
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/// Segments are written as <c><playlist path without extension><index><segment extension></c>.
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/// </summary>
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/// <param name="playlistPath">The absolute path of the HLS playlist (.m3u8) file.</param>
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/// <returns>The segment path prefix.</returns>
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public static string GetSegmentPathPrefix(string playlistPath)
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=> Path.ChangeExtension(playlistPath, null) ?? playlistPath;
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}
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