尝试访问swagger时超时错误.通过httpclient调用ihostdservice . json

Question

我想访问swagger。Json文件，并将其反序列化并存储到缓存中。

我正在IHostedService中进行异步调用。

public class InitializeCacheService : IHostedService
{
    private IMemoryCache _cache;
    public static readonly string swaggerJson = "swagger.json";
    private readonly HttpClient _httpClient;
    private readonly IServiceProvider _serviceProvider;
    public InitializeCacheService(IMemoryCache cache, HttpClient client, IServiceProvider serviceProvider)
    {
        _serviceProvider = serviceProvider;
        _httpClient = client;
        _cache = cache;
    }
    public async Task StartAsync(CancellationToken cancellationToken)
    {
        if (!_cache.TryGetValue(swaggerJson, out SwaggerDocumentCache cacheEntry))
        {
            _httpClient.BaseAddress = new Uri("https://localhost:44397");
            var response = await _httpClient.GetAsync("swagger/v1/swagger.json");
            response.EnsureSuccessStatusCode();
            using var responseStream = await response.Content.ReadAsStreamAsync();
            cacheEntry = await JsonSerializer.DeserializeAsync
                <SwaggerDocumentCache>(responseStream);
            var cacheEntryOptions = new MemoryCacheEntryOptions()
                  .SetSlidingExpiration(TimeSpan.FromSeconds(3));
            _cache.Set(swaggerJson, cacheEntry, cacheEntryOptions);
        }
    }
    public Task StopAsync(CancellationToken cancellationToken)
    {
        return Task.CompletedTask;
    }
}

但是应用程序一直在旋转，并且它正在超时var response = await _httpClient.GetAsync("swagger/v1/swagger.json");

给出的错误是:

IOException: Unable to read data from transport connection:由于线程退出或应用程序请求，I/O操作已经中止。

我在这里错过了什么?访问swagger.json构建自定义API游乐场应用程序的正确方法是什么?

Answer 1

SwaggerMiddleware处理服务OpenAPI文档。我们可以使用它作为参考来构建自己的文档。

第一个寄存器SwaggerGenerator与DI:

// Startup.Configure
services.AddTransient<SwaggerGenerator>();

然后注入到一个类中，这里我使用一个端点来直接服务它:

// Startup.Configure
app.UseEndpoints(e =>
{
    // ...
    e.MapGet("/openapi.json", context =>
    {
        // inject SwaggerGenerator
        var swaggerGenerator = context.RequestServices.GetRequiredService<SwaggerGenerator>();
        // document name is defined in Startup.ConfigureServices method inside the AddSwaggerGen call
        var doc = swaggerGenerator.GetSwagger("v1");
        // serialize the document as json
        using var writer = new StringWriter(CultureInfo.InvariantCulture);
        var serializer = new OpenApiJsonWriter(writer);
        doc.SerializeAsV3(serializer);
        var json = writer.ToString(); // this is the openapi document
        
        // serve it as json
        context.Response.ContentType = MediaTypeNames.Application.Json;
        return context.Response.WriteAsync(json, new UTF8Encoding(false));
    });
});

Answer 2

我认为实际的JSON不一定是有效的端点，这本身可能是一个问题。您是否尝试了在端点路由上没有显式文件名的调用?