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Only delay making request if necessary

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When requesting data from MusicBrainz, only delay the request if previous request was less than rate limit ago, instead of always delaying for one second at start.
This commit is contained in:
PloughPuff 2019-03-13 20:31:21 +00:00 committed by Ploughpuff
parent 208585d3f6
commit 6d3e6d800f
2 changed files with 27 additions and 41 deletions
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62
MediaBrowser.Providers/Music/MusicBrainzAlbumProvider.cs
View file

@ -1,5 +1,6 @@
using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.Globalization;
using System.IO;
using System.Linq;
@ -28,6 +29,7 @@ namespace MediaBrowser.Providers.Music
private readonly IApplicationHost _appHost;
private readonly ILogger _logger;
private readonly IJsonSerializer _json;
private Stopwatch _stopWatchMusicBrainz = new Stopwatch();
public readonly string MusicBrainzBaseUrl;
@ -45,6 +47,9 @@ namespace MediaBrowser.Providers.Music
MusicBrainzBaseUrl = configuration["MusicBrainz:BaseUrl"];
// Use a stopwatch to ensure we don't exceed the MusicBrainz rate limit
_stopWatchMusicBrainz.Start();
Current = this;
}
@ -54,8 +59,6 @@ namespace MediaBrowser.Providers.Music
var releaseGroupId = searchInfo.GetReleaseGroupId();
string url;
var isNameSearch = false;
bool forceMusicBrainzProper = false;
if (!string.IsNullOrEmpty(releaseId))
{
@ -64,7 +67,6 @@ namespace MediaBrowser.Providers.Music
else if (!string.IsNullOrEmpty(releaseGroupId))
{
url = string.Format("/ws/2/release?release-group={0}", releaseGroupId);
forceMusicBrainzProper = true;
}
else
{
@ -78,8 +80,6 @@ namespace MediaBrowser.Providers.Music
}
else
{
isNameSearch = true;
// I'm sure there is a better way but for now it resolves search for 12" Mixes
var queryName = searchInfo.Name.Replace("\"", string.Empty);
@ -91,7 +91,7 @@ namespace MediaBrowser.Providers.Music
if (!string.IsNullOrWhiteSpace(url))
{
using (var response = await GetMusicBrainzResponse(url, isNameSearch, forceMusicBrainzProper, cancellationToken).ConfigureAwait(false))
using (var response = await GetMusicBrainzResponse(url, cancellationToken).ConfigureAwait(false))
{
using (var stream = response.Content)
{
@ -247,7 +247,7 @@ namespace MediaBrowser.Providers.Music
WebUtility.UrlEncode(albumName),
artistId);
using (var response = await GetMusicBrainzResponse(url, true, cancellationToken).ConfigureAwait(false))
using (var response = await GetMusicBrainzResponse(url, cancellationToken).ConfigureAwait(false))
using (var stream = response.Content)
using (var oReader = new StreamReader(stream, Encoding.UTF8))
{
@ -272,7 +272,7 @@ namespace MediaBrowser.Providers.Music
WebUtility.UrlEncode(albumName),
WebUtility.UrlEncode(artistName));
using (var response = await GetMusicBrainzResponse(url, true, cancellationToken).ConfigureAwait(false))
using (var response = await GetMusicBrainzResponse(url, cancellationToken).ConfigureAwait(false))
using (var stream = response.Content)
using (var oReader = new StreamReader(stream, Encoding.UTF8))
{
@ -589,7 +589,7 @@ namespace MediaBrowser.Providers.Music
{
var url = string.Format("/ws/2/release?release-group={0}", releaseGroupId);
using (var response = await GetMusicBrainzResponse(url, true, true, cancellationToken).ConfigureAwait(false))
using (var response = await GetMusicBrainzResponse(url, cancellationToken).ConfigureAwait(false))
using (var stream = response.Content)
using (var oReader = new StreamReader(stream, Encoding.UTF8))
{
@ -625,7 +625,7 @@ namespace MediaBrowser.Providers.Music
{
var url = string.Format("/ws/2/release-group/?query=reid:{0}", releaseEntryId);
using (var response = await GetMusicBrainzResponse(url, false, cancellationToken).ConfigureAwait(false))
using (var response = await GetMusicBrainzResponse(url, cancellationToken).ConfigureAwait(false))
using (var stream = response.Content)
using (var oReader = new StreamReader(stream, Encoding.UTF8))
{
@ -710,34 +710,32 @@ namespace MediaBrowser.Providers.Music
return null;
}
internal Task<HttpResponseInfo> GetMusicBrainzResponse(string url, bool isSearch, CancellationToken cancellationToken)
{
return GetMusicBrainzResponse(url, isSearch, false, cancellationToken);
}
/// <summary>
/// Gets the music brainz response.
/// Makes request to MusicBrainz server and awaits a response.
/// </summary>
internal async Task<HttpResponseInfo> GetMusicBrainzResponse(string url, bool isSearch, bool forceMusicBrainzProper, CancellationToken cancellationToken)
internal async Task<HttpResponseInfo> GetMusicBrainzResponse(string url, CancellationToken cancellationToken)
{
var urlInfo = new MbzUrl(MusicBrainzBaseUrl, 1000);
var throttleMs = urlInfo.throttleMs;
// The Jellyfin user-agent is unrestricted but source IP must not exceed
// one request per second, therefore we rate limit to avoid throttling
// https://musicbrainz.org/doc/XML_Web_Service/Rate_Limiting
const long QueryIntervalMs = 1000u;
if (throttleMs > 0)
// Only delay if necessary
if (_stopWatchMusicBrainz.ElapsedMilliseconds < QueryIntervalMs)
{
// MusicBrainz is extremely adamant about limiting to one request per second
_logger.LogDebug("Throttling MusicBrainz by {0}ms", throttleMs.ToString(CultureInfo.InvariantCulture));
await Task.Delay(throttleMs, cancellationToken).ConfigureAwait(false);
var delayMs = QueryIntervalMs - _stopWatchMusicBrainz.ElapsedMilliseconds;
await Task.Delay((int)delayMs, cancellationToken).ConfigureAwait(false);
}
url = urlInfo.url.TrimEnd('/') + url;
_logger.LogDebug("MusicBrainz time since previous request: {0}ms", _stopWatchMusicBrainz.ElapsedMilliseconds);
_stopWatchMusicBrainz.Restart();
var options = new HttpRequestOptions
{
Url = url,
Url = MusicBrainzBaseUrl.TrimEnd('/') + url,
CancellationToken = cancellationToken,
UserAgent = _appHost.ApplicationUserAgent,
BufferContent = throttleMs > 0
BufferContent = false
};
return await _httpClient.SendAsync(options, "GET").ConfigureAwait(false);
@ -749,17 +747,5 @@ namespace MediaBrowser.Providers.Music
{
throw new NotImplementedException();
}
internal class MbzUrl
{
internal MbzUrl(string url, int throttleMs)
{
this.url = url;
this.throttleMs = throttleMs;
}
public string url { get; set; }
public int throttleMs { get; set; }
}
}
}

6
MediaBrowser.Providers/Music/MusicBrainzArtistProvider.cs
View file

@ -31,7 +31,7 @@ namespace MediaBrowser.Providers.Music
{
var url = string.Format("/ws/2/artist/?query=arid:{0}", musicBrainzId);
using (var response = await MusicBrainzAlbumProvider.Current.GetMusicBrainzResponse(url, false, cancellationToken).ConfigureAwait(false))
using (var response = await MusicBrainzAlbumProvider.Current.GetMusicBrainzResponse(url, cancellationToken).ConfigureAwait(false))
{
using (var stream = response.Content)
{
@ -46,7 +46,7 @@ namespace MediaBrowser.Providers.Music
var url = string.Format("/ws/2/artist/?query=\"{0}\"&dismax=true", UrlEncode(nameToSearch));
using (var response = await MusicBrainzAlbumProvider.Current.GetMusicBrainzResponse(url, true, cancellationToken).ConfigureAwait(false))
using (var response = await MusicBrainzAlbumProvider.Current.GetMusicBrainzResponse(url, cancellationToken).ConfigureAwait(false))
{
using (var stream = response.Content)
{
@ -64,7 +64,7 @@ namespace MediaBrowser.Providers.Music
// Try again using the search with accent characters url
url = string.Format("/ws/2/artist/?query=artistaccent:\"{0}\"", UrlEncode(nameToSearch));
using (var response = await MusicBrainzAlbumProvider.Current.GetMusicBrainzResponse(url, true, cancellationToken).ConfigureAwait(false))
using (var response = await MusicBrainzAlbumProvider.Current.GetMusicBrainzResponse(url, cancellationToken).ConfigureAwait(false))
{
using (var stream = response.Content)
{