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// Copyright (c) .NET Foundation. All rights reserved.
// Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
using System;
using Microsoft.Extensions.Http.Logging;
using Microsoft.Extensions.Logging;
namespace Microsoft.Extensions.Http
{
// Internal so we can change the requirements without breaking changes.
internal class LoggingHttpMessageHandlerBuilderFilter : IHttpMessageHandlerBuilderFilter
{
private readonly ILoggerFactory _loggerFactory;
public LoggingHttpMessageHandlerBuilderFilter(ILoggerFactory loggerFactory)
{
if (loggerFactory == null)
{
throw new ArgumentNullException(nameof(loggerFactory));
}
_loggerFactory = loggerFactory;
}
public Action<HttpMessageHandlerBuilder> Configure(Action<HttpMessageHandlerBuilder> next)
{
if (next == null)
{
throw new ArgumentNullException(nameof(next));
}
return (builder) =>
{
// Run other configuration first, we want to decorate.
next(builder);
var loggerName = !string.IsNullOrEmpty(builder.Name) ? builder.Name : "Default";
// We want all of our logging message to show up as-if they are coming from HttpClient,
// but also to include the name of the client for more fine-grained control.
var outerLogger = _loggerFactory.CreateLogger($"System.Net.Http.HttpClient.{loggerName}.LogicalHandler");
var innerLogger = _loggerFactory.CreateLogger($"System.Net.Http.HttpClient.{loggerName}.ClientHandler");
// The 'scope' handler goes first so it can surround everything.
builder.AdditionalHandlers.Insert(0, new LoggingScopeHttpMessageHandler(outerLogger));
// We want this handler to be last so we can log details about the request after
// service discovery and security happen.
builder.AdditionalHandlers.Add(new LoggingHttpMessageHandler(innerLogger));
};
}
}
}
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