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using System;
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using System.Collections.Generic;
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using MediaBrowser.Common.Configuration;
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using MediaBrowser.Model.Configuration;
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using Microsoft.Extensions.Logging;
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namespace Jellyfin.Server
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{
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/// <summary>
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/// The class that knows how migrate between different Jellyfin versions.
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/// </summary>
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internal static class Migrations
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{
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private static readonly IUpdater[] _migrations =
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{
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new Pre10_5()
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};
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/// <summary>
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/// Interface that descibes a migration routine.
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/// </summary>
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private interface IUpdater
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{
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/// <summary>
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/// Gets maximum version this Updater applies to.
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/// If current version is greater or equal to it, skip the updater.
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/// </summary>
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public abstract Version Maximum { get; }
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/// <summary>
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/// Execute the migration from version "from".
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/// </summary>
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/// <param name="host">Host that hosts current version.</param>
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/// <param name="logger">Host logger.</param>
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/// <param name="from">Version to migrate from.</param>
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/// <returns>Whether configuration was changed.</returns>
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public abstract bool Perform(CoreAppHost host, ILogger logger, Version from);
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}
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/// <summary>
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/// Run all needed migrations.
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/// </summary>
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/// <param name="host">CoreAppHost that hosts current version.</param>
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/// <param name="logger">AppHost logger.</param>
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/// <returns>Whether anything was changed.</returns>
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public static bool Run(CoreAppHost host, ILogger logger)
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{
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bool updated = false;
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var version = host.ServerConfigurationManager.CommonConfiguration.PreviousVersion;
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for (var i = 0; i < _migrations.Length; i++)
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{
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var updater = _migrations[i];
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if (version.CompareTo(updater.Maximum) >= 0)
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{
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logger.LogDebug("Skipping updater {0} as current version {1} >= its maximum applicable version {2}", updater, version, updater.Maximum);
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continue;
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}
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if (updater.Perform(host, logger, version))
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{
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updated = true;
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}
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version = updater.Maximum;
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}
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return updated;
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}
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private class Pre10_5 : IUpdater
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{
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public Version Maximum { get => Version.Parse("10.5.0"); }
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public bool Perform(CoreAppHost host, ILogger logger, Version from)
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{
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// Set EnableThrottling to false as it wasn't used before, and in 10.5.0 it may introduce issues
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var encoding = ((IConfigurationManager)host.ServerConfigurationManager).GetConfiguration<EncodingOptions>("encoding");
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if (encoding.EnableThrottling)
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{
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logger.LogInformation("Disabling transcoding throttling during migration");
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encoding.EnableThrottling = false;
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host.ServerConfigurationManager.SaveConfiguration("encoding", encoding);
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return true;
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}
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return false;
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}
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}
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}
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}
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