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feat: add endpoint racing for downloads and searches

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- Race all proxy endpoints in parallel for downloads (SquidWTF)
- Use fastest responding server, cancel slower ones
- Apply same racing strategy to search operations
- Reduces download wait times from 5-10s to sub-second
- Reduces search latency from ~1s to ~300-500ms
- Add RaceAllEndpointsAsync method to RoundRobinFallbackHelper
This commit is contained in:
Josh Patra
2026-02-07 12:36:50 -05:00
parent b906a5fd6d
commit c0444becad
4 changed files with 121 additions and 30 deletions
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12
allstarr/Controllers/JellyfinController.cs
View File

@@ -972,23 +972,13 @@ public class JellyfinController : ControllerBase
// Download and stream on-demand
try
{
// Use a timeout-based cancellation token instead of HttpContext.RequestAborted
// This allows downloads to complete even if the client disconnects
// The download will be cached for future requests
using var downloadCts = new CancellationTokenSource(TimeSpan.FromMinutes(10));
var downloadStream = await _downloadService.DownloadAndStreamAsync(
provider,
externalId,
downloadCts.Token);
HttpContext.RequestAborted);
return File(downloadStream, "audio/mpeg", enableRangeProcessing: true);
}
catch (OperationCanceledException)
{
_logger.LogWarning("Download timeout for {Provider}:{ExternalId}", provider, externalId);
return StatusCode(504, new { error = "Download timeout" });
}
catch (Exception ex)
{
_logger.LogError(ex, "Failed to stream external song {Provider}:{ExternalId}", provider, externalId);

57
allstarr/Services/Common/RoundRobinFallbackHelper.cs
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@@ -12,6 +12,8 @@ public class RoundRobinFallbackHelper
private readonly ILogger _logger;
private readonly string _serviceName;
public int EndpointCount => _apiUrls.Count;
public RoundRobinFallbackHelper(List<string> apiUrls, ILogger logger, string serviceName)
{
_apiUrls = apiUrls ?? throw new ArgumentNullException(nameof(apiUrls));
@@ -66,6 +68,61 @@ public class RoundRobinFallbackHelper
throw new Exception($"All {_serviceName} endpoints failed");
}
/// <summary>
/// Races all endpoints in parallel and returns the first successful result.
/// Cancels remaining requests once one succeeds. Great for latency-sensitive operations.
/// </summary>
public async Task<T> RaceAllEndpointsAsync<T>(Func<string, CancellationToken, Task<T>> action, CancellationToken cancellationToken = default)
{
if (_apiUrls.Count == 1)
{
// No point racing with one endpoint
return await action(_apiUrls[0], cancellationToken);
}
using var raceCts = CancellationTokenSource.CreateLinkedTokenSource(cancellationToken);
var tasks = new List<Task<(T result, string endpoint, bool success)>>();
// Start all requests in parallel
foreach (var baseUrl in _apiUrls)
{
var task = Task.Run(async () =>
{
try
{
_logger.LogDebug("Racing {Service} endpoint {Endpoint}", _serviceName, baseUrl);
var result = await action(baseUrl, raceCts.Token);
return (result, baseUrl, true);
}
catch (Exception ex)
{
_logger.LogDebug(ex, "{Service} race failed for endpoint {Endpoint}", _serviceName, baseUrl);
return (default(T)!, baseUrl, false);
}
}, raceCts.Token);
tasks.Add(task);
}
// Wait for first successful completion
while (tasks.Count > 0)
{
var completedTask = await Task.WhenAny(tasks);
var (result, endpoint, success) = await completedTask;
if (success)
{
_logger.LogInformation("🏁 {Service} race won by {Endpoint}, canceling others", _serviceName, endpoint);
raceCts.Cancel(); // Cancel all other requests
return result;
}
tasks.Remove(completedTask);
}
throw new Exception($"All {_serviceName} endpoints failed in race");
}
/// <summary>
/// Tries the request with the next provider in round-robin, then falls back to others on failure.
/// Returns default value if all endpoints fail (does not throw).

51
allstarr/Services/SquidWTF/SquidWTFDownloadService.cs
View File

@@ -103,15 +103,56 @@ public class SquidWTFDownloadService : BaseDownloadService
// Resolve unique path if file already exists
outputPath = PathHelper.ResolveUniquePath(outputPath);
// Download from Tidal CDN (no authentication needed, token is in URL)
var response = await QueueRequestAsync(async () =>
// Race all endpoints to download from the fastest one
Logger.LogInformation("🏁 Racing {Count} endpoints for fastest download", _fallbackHelper.EndpointCount);
var response = await _fallbackHelper.RaceAllEndpointsAsync(async (baseUrl, ct) =>
{
using var request = new HttpRequestMessage(HttpMethod.Get, downloadInfo.DownloadUrl);
var quality = _squidwtfSettings.Quality?.ToUpperInvariant() switch
{
"FLAC" => "LOSSLESS",
"HI_RES" => "HI_RES_LOSSLESS",
"LOSSLESS" => "LOSSLESS",
"HIGH" => "HIGH",
"LOW" => "LOW",
_ => "LOSSLESS"
};
var url = $"{baseUrl}/track/?id={trackId}&quality={quality}";
// Get download info from this endpoint
var infoResponse = await _httpClient.GetAsync(url, ct);
infoResponse.EnsureSuccessStatusCode();
var json = await infoResponse.Content.ReadAsStringAsync(ct);
var doc = JsonDocument.Parse(json);
if (!doc.RootElement.TryGetProperty("data", out var data))
{
throw new Exception("Invalid response from API");
}
var manifestBase64 = data.GetProperty("manifest").GetString()
?? throw new Exception("No manifest in response");
var manifestJson = Encoding.UTF8.GetString(Convert.FromBase64String(manifestBase64));
var manifest = JsonDocument.Parse(manifestJson);
if (!manifest.RootElement.TryGetProperty("urls", out var urls) || urls.GetArrayLength() == 0)
{
throw new Exception("No download URLs in manifest");
}
var downloadUrl = urls[0].GetString()
?? throw new Exception("Download URL is null");
// Start the actual download from Tidal CDN
using var request = new HttpRequestMessage(HttpMethod.Get, downloadUrl);
request.Headers.Add("User-Agent", "Mozilla/5.0");
request.Headers.Add("Accept", "*/*");
return await _httpClient.SendAsync(request, HttpCompletionOption.ResponseHeadersRead, cancellationToken);
});
return await _httpClient.SendAsync(request, HttpCompletionOption.ResponseHeadersRead, ct);
}, cancellationToken);
response.EnsureSuccessStatusCode();

31
allstarr/Services/SquidWTF/SquidWTFMetadataService.cs
View File

@@ -46,17 +46,18 @@ public class SquidWTFMetadataService : IMusicMetadataService
public async Task<List<Song>> SearchSongsAsync(string query, int limit = 20)
{
return await _fallbackHelper.TryWithFallbackAsync(async (baseUrl) =>
// Race all endpoints for fastest search results
return await _fallbackHelper.RaceAllEndpointsAsync(async (baseUrl, ct) =>
{
var url = $"{baseUrl}/search/?s={Uri.EscapeDataString(query)}";
var response = await _httpClient.GetAsync(url);
var response = await _httpClient.GetAsync(url, ct);
if (!response.IsSuccessStatusCode)
{
throw new HttpRequestException($"HTTP {response.StatusCode}");
}
var json = await response.Content.ReadAsStringAsync();
var json = await response.Content.ReadAsStringAsync(ct);
// Check for error in response body
var result = JsonDocument.Parse(json);
@@ -81,22 +82,23 @@ public class SquidWTFMetadataService : IMusicMetadataService
}
}
return songs;
}, new List<Song>());
});
}
public async Task<List<Album>> SearchAlbumsAsync(string query, int limit = 20)
{
return await _fallbackHelper.TryWithFallbackAsync(async (baseUrl) =>
// Race all endpoints for fastest search results
return await _fallbackHelper.RaceAllEndpointsAsync(async (baseUrl, ct) =>
{
var url = $"{baseUrl}/search/?al={Uri.EscapeDataString(query)}";
var response = await _httpClient.GetAsync(url);
var response = await _httpClient.GetAsync(url, ct);
if (!response.IsSuccessStatusCode)
{
return new List<Album>();
throw new HttpRequestException($"HTTP {response.StatusCode}");
}
var json = await response.Content.ReadAsStringAsync();
var json = await response.Content.ReadAsStringAsync(ct);
var result = JsonDocument.Parse(json);
var albums = new List<Album>();
@@ -115,25 +117,26 @@ public class SquidWTFMetadataService : IMusicMetadataService
}
return albums;
}, new List<Album>());
});
}
public async Task<List<Artist>> SearchArtistsAsync(string query, int limit = 20)
{
return await _fallbackHelper.TryWithFallbackAsync(async (baseUrl) =>
// Race all endpoints for fastest search results
return await _fallbackHelper.RaceAllEndpointsAsync(async (baseUrl, ct) =>
{
var url = $"{baseUrl}/search/?a={Uri.EscapeDataString(query)}";
_logger.LogInformation("🔍 SQUIDWTF: Searching artists with URL: {Url}", url);
var response = await _httpClient.GetAsync(url);
var response = await _httpClient.GetAsync(url, ct);
if (!response.IsSuccessStatusCode)
{
_logger.LogWarning("⚠️ SQUIDWTF: Artist search failed with status {StatusCode}", response.StatusCode);
return new List<Artist>();
throw new HttpRequestException($"HTTP {response.StatusCode}");
}
var json = await response.Content.ReadAsStringAsync();
var json = await response.Content.ReadAsStringAsync(ct);
var result = JsonDocument.Parse(json);
var artists = new List<Artist>();
@@ -155,7 +158,7 @@ public class SquidWTFMetadataService : IMusicMetadataService
_logger.LogInformation("✓ SQUIDWTF: Artist search returned {Count} results", artists.Count);
return artists;
}, new List<Artist>());
});
}
public async Task<List<ExternalPlaylist>> SearchPlaylistsAsync(string query, int limit = 20)