ServiceStack/src/ServiceStack/HotReloadFeature.cs at master · csharpbuilder/ServiceStack · GitHub

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using System;

using System.Collections.Generic;

using System.Linq;

using System.Threading.Tasks;

using ServiceStack.DataAnnotations;

namespace ServiceStack

{

/// <summary>

/// Back-end Service used by /js/hot-fileloader.js to detect file changes in /wwwroot and auto reload page.

/// </summary>

public class HotReloadFeature : IPlugin

{

public void Register(IAppHost appHost)

{

appHost.RegisterService(typeof(HotReloadFilesService));

}

[ExcludeMetadata]

[Route("/hotreload/files")]

public class HotReloadFiles : IReturn<HotReloadPageResponse>

{

public string Pattern { get; set; }

public string ETag { get; set; }

}

[DefaultRequest(typeof(HotReloadFiles))]

[Restrict(VisibilityTo = RequestAttributes.None)]

public class HotReloadFilesService : Service

{

public static List<string> ExcludePatterns { get; } = new List<string> {

"*.sqlite",

"*.db",

};

public static TimeSpan LongPollDuration = TimeSpan.FromSeconds(60);

public static TimeSpan CheckDelay = TimeSpan.FromMilliseconds(50);

// No delay sometimes causes repetitive loop

public static TimeSpan ModifiedDelay = TimeSpan.FromMilliseconds(50);

public async Task<HotReloadPageResponse> Any(HotReloadFiles request)

{

var pattern = request.Pattern ?? "*";

var startedAt = DateTime.UtcNow;

var maxLastModified = DateTime.MinValue;

var shouldReload = false;

while (DateTime.UtcNow - startedAt < LongPollDuration)

{

maxLastModified = DateTime.MinValue;

var files = VirtualFileSources.GetAllMatchingFiles(pattern);

foreach (var file in files)

{

if (ExcludePatterns.Any(exclude => file.Name.Glob(exclude)) == true)

continue;

file.Refresh();

if (file.LastModified > maxLastModified)

maxLastModified = file.LastModified;

}

if (string.IsNullOrEmpty(request.ETag))

return new HotReloadPageResponse { ETag = maxLastModified.Ticks.ToString() };

shouldReload = maxLastModified != DateTime.MinValue && maxLastModified.Ticks > long.Parse(request.ETag);

if (shouldReload)

{

await Task.Delay(ModifiedDelay);

break;

}

await Task.Delay(CheckDelay);

}

return new HotReloadPageResponse { Reload = shouldReload, ETag = maxLastModified.Ticks.ToString() };

}

ServiceStack/src/ServiceStack/HotReloadFeature.cs at master · csharpbuilder/ServiceStack · GitHub

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