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Make MusicBrainzAlbumProvider thread safe

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This commit is contained in:
Gary Wilber 2020-10-02 17:14:57 -07:00
parent c7b3d4a90c
commit 04cdc89a5c
1 changed files with 39 additions and 28 deletions
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67
MediaBrowser.Providers/Plugins/MusicBrainz/MusicBrainzAlbumProvider.cs
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@ -46,6 +46,7 @@ namespace MediaBrowser.Providers.Music
private readonly string _musicBrainzBaseUrl;
private SemaphoreSlim _apiRequestLock = new SemaphoreSlim(1, 1);
private Stopwatch _stopWatchMusicBrainz = new Stopwatch();
public MusicBrainzAlbumProvider(
@ -742,45 +743,55 @@ namespace MediaBrowser.Providers.Music
/// </summary>
internal async Task<HttpResponseMessage> GetMusicBrainzResponse(string url, CancellationToken cancellationToken)
{
using var options = new HttpRequestMessage(HttpMethod.Get, _musicBrainzBaseUrl.TrimEnd('/') + url);
// MusicBrainz request a contact email address is supplied, as comment, in user agent field:
// https://musicbrainz.org/doc/XML_Web_Service/Rate_Limiting#User-Agent
options.Headers.UserAgent.ParseAdd(string.Format(
CultureInfo.InvariantCulture,
"{0} ( {1} )",
_appHost.ApplicationUserAgent,
_appHost.ApplicationUserAgentAddress));
HttpResponseMessage response;
var attempts = 0u;
var requestUrl = _musicBrainzBaseUrl.TrimEnd('/') + url;
do
await _apiRequestLock.WaitAsync(cancellationToken).ConfigureAwait(false);
try
{
attempts++;
if (_stopWatchMusicBrainz.ElapsedMilliseconds < _musicBrainzQueryIntervalMs)
do
{
// MusicBrainz is extremely adamant about limiting to one request per second
var delayMs = _musicBrainzQueryIntervalMs - _stopWatchMusicBrainz.ElapsedMilliseconds;
await Task.Delay((int)delayMs, cancellationToken).ConfigureAwait(false);
attempts++;
if (_stopWatchMusicBrainz.ElapsedMilliseconds < _musicBrainzQueryIntervalMs)
{
// MusicBrainz is extremely adamant about limiting to one request per second
var delayMs = _musicBrainzQueryIntervalMs - _stopWatchMusicBrainz.ElapsedMilliseconds;
await Task.Delay((int)delayMs, cancellationToken).ConfigureAwait(false);
}
// Write time since last request to debug log as evidence we're meeting rate limit
// requirement, before resetting stopwatch back to zero.
_logger.LogDebug("GetMusicBrainzResponse: Time since previous request: {0} ms", _stopWatchMusicBrainz.ElapsedMilliseconds);
_stopWatchMusicBrainz.Restart();
using var request = new HttpRequestMessage(HttpMethod.Get, _musicBrainzBaseUrl.TrimEnd('/') + url);
// MusicBrainz request a contact email address is supplied, as comment, in user agent field:
// https://musicbrainz.org/doc/XML_Web_Service/Rate_Limiting#User-Agent
request.Headers.UserAgent.ParseAdd(string.Format(
CultureInfo.InvariantCulture,
"{0} ( {1} )",
_appHost.ApplicationUserAgent,
_appHost.ApplicationUserAgentAddress));
response = await _httpClientFactory.CreateClient(NamedClient.Default).SendAsync(request).ConfigureAwait(false);
// We retry a finite number of times, and only whilst MB is indicating 503 (throttling)
}
// Write time since last request to debug log as evidence we're meeting rate limit
// requirement, before resetting stopwatch back to zero.
_logger.LogDebug("GetMusicBrainzResponse: Time since previous request: {0} ms", _stopWatchMusicBrainz.ElapsedMilliseconds);
_stopWatchMusicBrainz.Restart();
response = await _httpClientFactory.CreateClient(NamedClient.Default).SendAsync(options).ConfigureAwait(false);
// We retry a finite number of times, and only whilst MB is indicating 503 (throttling)
while (attempts < MusicBrainzQueryAttempts && response.StatusCode == HttpStatusCode.ServiceUnavailable);
}
finally
{
_apiRequestLock.Release();
}
while (attempts < MusicBrainzQueryAttempts && response.StatusCode == HttpStatusCode.ServiceUnavailable);
// Log error if unable to query MB database due to throttling
if (attempts == MusicBrainzQueryAttempts && response.StatusCode == HttpStatusCode.ServiceUnavailable)
{
_logger.LogError("GetMusicBrainzResponse: 503 Service Unavailable (throttled) response received {0} times whilst requesting {1}", attempts, options.RequestUri);
_logger.LogError("GetMusicBrainzResponse: 503 Service Unavailable (throttled) response received {0} times whilst requesting {1}", attempts, requestUrl);
}
return response;