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Epub/KoeBook.Epub/Contracts/Services/IScrapingClientService.cs
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,18 @@ | ||
| using System.Net.Http.Headers; | ||
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| namespace KoeBook.Epub.Contracts.Services; | ||
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| public interface IScrapingClientService | ||
| { | ||
| /// <summary> | ||
| /// スクレイピングでGETする用 | ||
| /// APIを叩く際は不要 | ||
| /// </summary> | ||
| Task<string> GetAsStringAsync(string url, CancellationToken ct); | ||
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| /// <summary> | ||
| /// スクレイピングでGETする用 | ||
| /// APIを叩く際は不要 | ||
| /// </summary> | ||
| Task<ContentDispositionHeaderValue?> GetAsStreamAsync(string url, Stream destination, CancellationToken ct); | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,116 @@ | ||
| using System.Net.Http.Headers; | ||
| using KoeBook.Epub.Contracts.Services; | ||
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| namespace KoeBook.Epub.Services; | ||
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| public sealed class ScrapingClientService : IScrapingClientService, IDisposable | ||
| { | ||
| private readonly IHttpClientFactory _httpClientFactory; | ||
| private readonly PeriodicTimer _periodicTimer; | ||
| private readonly Queue<Func<HttpClient, Task>> _actionQueue = []; | ||
| private bool _workerActivated; | ||
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| public ScrapingClientService(IHttpClientFactory httpClientFactory, TimeProvider timeProvider) | ||
| { | ||
| _httpClientFactory = httpClientFactory; | ||
| _periodicTimer = new(TimeSpan.FromSeconds(10), timeProvider); | ||
| } | ||
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| public Task<string> GetAsStringAsync(string url, CancellationToken ct) | ||
| { | ||
| var taskCompletion = new TaskCompletionSource<string>(); | ||
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| lock (_actionQueue) | ||
| _actionQueue.Enqueue(async httpClient => | ||
| { | ||
| if (ct.IsCancellationRequested) | ||
| taskCompletion.SetCanceled(ct); | ||
| try | ||
| { | ||
| var response = await httpClient.GetAsync(url, ct).ConfigureAwait(false); | ||
| taskCompletion.SetResult(await response.Content.ReadAsStringAsync(ct).ConfigureAwait(false)); | ||
| } | ||
| catch (Exception ex) | ||
| { | ||
| taskCompletion.SetException(ex); | ||
| } | ||
| }); | ||
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| EnsureWorkerActivated(); | ||
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| return taskCompletion.Task; | ||
| } | ||
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| public Task<ContentDispositionHeaderValue?> GetAsStreamAsync(string url, Stream destination, CancellationToken ct) | ||
| { | ||
| var taskCompletion = new TaskCompletionSource<ContentDispositionHeaderValue?>(); | ||
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| lock (_actionQueue) | ||
| _actionQueue.Enqueue(async httpClient => | ||
| { | ||
| if (ct.IsCancellationRequested) | ||
| taskCompletion.SetCanceled(ct); | ||
| try | ||
| { | ||
| var response = await httpClient.GetAsync(url, ct).ConfigureAwait(false); | ||
| await response.Content.CopyToAsync(destination, ct).ConfigureAwait(false); | ||
| taskCompletion.SetResult(response.Content.Headers.ContentDisposition); | ||
| } | ||
| catch (Exception ex) | ||
| { | ||
| taskCompletion.SetException(ex); | ||
| } | ||
| }); | ||
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| EnsureWorkerActivated(); | ||
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| return taskCompletion.Task; | ||
| } | ||
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| /// <summary> | ||
| /// <see cref="Worker"/>が起動していない場合は起動します | ||
| /// </summary> | ||
| private void EnsureWorkerActivated() | ||
| { | ||
| bool activateWorker; | ||
| lock (_actionQueue) activateWorker = !_workerActivated; | ||
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| if (activateWorker) | ||
| Worker(); | ||
| } | ||
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| /// <summary> | ||
| /// <see cref="_actionQueue"/>のConsumer | ||
| /// 別スレッドでループさせるためにvoid | ||
| /// </summary> | ||
| private async void Worker() | ||
| { | ||
| lock (_actionQueue) | ||
| _workerActivated = true; | ||
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| try | ||
| { | ||
| while (await _periodicTimer.WaitForNextTickAsync().ConfigureAwait(false) && _actionQueue.Count > 0) | ||
| { | ||
| Func<HttpClient, Task>? action; | ||
| lock (_actionQueue) | ||
| if (!_actionQueue.TryDequeue(out action)) | ||
| continue; | ||
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| await action(_httpClientFactory.CreateClient()).ConfigureAwait(ConfigureAwaitOptions.SuppressThrowing); | ||
| } | ||
| } | ||
| finally | ||
| { | ||
| lock (_actionQueue) | ||
| _workerActivated = false; | ||
| } | ||
| } | ||
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| public void Dispose() | ||
| { | ||
| _periodicTimer.Dispose(); | ||
| } | ||
| } |
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