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AspNetCore Response Streaming
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| using Microsoft.AspNetCore.Builder; | |
| using Microsoft.AspNetCore.Hosting; | |
| using Microsoft.AspNetCore.Http.Features; | |
| using Microsoft.Extensions.DependencyInjection; | |
| using Microsoft.Extensions.Hosting; | |
| using Microsoft.Extensions.Logging; | |
| using System; | |
| using System.Collections.Generic; | |
| using System.IO; | |
| using System.Net; | |
| using System.Net.Http; | |
| using System.Text; | |
| using System.Threading; | |
| using System.Threading.Tasks; | |
| namespace Http | |
| { | |
| internal static class TaskHelper | |
| { | |
| internal static Task WaitAsync(this CancellationToken cancellationToken) | |
| { | |
| TaskCompletionSource<bool> cancelationTaskCompletionSource = new TaskCompletionSource<bool>(); | |
| cancellationToken.Register(CancellationTokenCallback, cancelationTaskCompletionSource); | |
| return cancellationToken.IsCancellationRequested ? Task.CompletedTask : cancelationTaskCompletionSource.Task; | |
| } | |
| private static void CancellationTokenCallback(object taskCompletionSource) | |
| { | |
| ((TaskCompletionSource<bool>)taskCompletionSource).SetResult(true); | |
| } | |
| } | |
| class Program | |
| { | |
| static async Task Main(string[] args) | |
| { | |
| var queue = new Queue<string>(); | |
| Task.Run(async () => | |
| { | |
| while (true) | |
| { | |
| await Task.Delay(1000); | |
| queue.Enqueue($"New event: {Guid.NewGuid().ToString()}"); | |
| } | |
| }); | |
| using var host = new HostBuilder().ConfigureWebHostDefaults(config => | |
| { | |
| config.UseKestrel(config => | |
| { | |
| config.Listen(IPAddress.Loopback, 8080); | |
| }) | |
| .ConfigureServices(config => | |
| { | |
| config.AddLogging(setup => setup.AddConsole()); | |
| }) | |
| .Configure(app => | |
| { | |
| app.Map("/stream", builder => | |
| { | |
| builder.Run(async context => | |
| { | |
| var body = context.Features.Get<IHttpResponseBodyFeature>(); | |
| body.DisableBuffering(); | |
| Task.Run(async () => | |
| { | |
| while (!context.RequestAborted.IsCancellationRequested) | |
| { | |
| if (queue.Count > 0) | |
| { | |
| var item = $"{queue.Dequeue()}/n"; | |
| await body.Writer.WriteAsync(Encoding.UTF8.GetBytes($"{item}\n")); | |
| await body.Writer.FlushAsync(); | |
| } | |
| } | |
| }); | |
| await context.RequestAborted.WaitAsync(); | |
| Console.WriteLine("Connection Aborted by client"); | |
| }); | |
| }); | |
| }); | |
| }).Build(); | |
| await host.StartAsync(); | |
| using (var httpClient = new HttpClient()) | |
| { | |
| var resp = await httpClient.GetStreamAsync("http://localhost:8080/stream"); | |
| using var reader = new StreamReader(resp); | |
| Task.Run(async () => | |
| { | |
| while (true) | |
| { | |
| var line = await reader.ReadLineAsync(); | |
| Console.WriteLine(line); | |
| await Task.Delay(400); | |
| } | |
| }); | |
| var reset = new ManualResetEventSlim(); | |
| Console.CancelKeyPress += (s, e) => | |
| { | |
| resp.Close(); | |
| reset.Set(); | |
| }; | |
| reset.Wait(); | |
| } | |
| } | |
| } | |
| } |
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