/
ServerLoggerInterceptor.cs
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/
ServerLoggerInterceptor.cs
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#region Copyright notice and license
// Copyright 2019 The gRPC Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#endregion
using System.Linq;
using System.Threading.Tasks;
using Grpc.Core;
using Grpc.Core.Interceptors;
using Microsoft.Extensions.Logging;
namespace Client
{
public class ServerLoggerInterceptor : Interceptor
{
private readonly ILogger<ServerLoggerInterceptor> _logger;
public ServerLoggerInterceptor(ILogger<ServerLoggerInterceptor> logger)
{
_logger = logger;
}
public override Task<TResponse> UnaryServerHandler<TRequest, TResponse>(
TRequest request,
ServerCallContext context,
UnaryServerMethod<TRequest, TResponse> continuation)
{
LogCall<TRequest, TResponse>(MethodType.DuplexStreaming, context);
return continuation(request, context);
}
public override Task<TResponse> ClientStreamingServerHandler<TRequest, TResponse>(
IAsyncStreamReader<TRequest> requestStream,
ServerCallContext context,
ClientStreamingServerMethod<TRequest, TResponse> continuation)
{
LogCall<TRequest, TResponse>(MethodType.DuplexStreaming, context);
return base.ClientStreamingServerHandler(requestStream, context, continuation);
}
public override Task ServerStreamingServerHandler<TRequest, TResponse>(
TRequest request,
IServerStreamWriter<TResponse> responseStream,
ServerCallContext context,
ServerStreamingServerMethod<TRequest, TResponse> continuation)
{
LogCall<TRequest, TResponse>(MethodType.DuplexStreaming, context);
return base.ServerStreamingServerHandler(request, responseStream, context, continuation);
}
public override Task DuplexStreamingServerHandler<TRequest, TResponse>(
IAsyncStreamReader<TRequest> requestStream,
IServerStreamWriter<TResponse> responseStream,
ServerCallContext context,
DuplexStreamingServerMethod<TRequest, TResponse> continuation)
{
LogCall<TRequest, TResponse>(MethodType.DuplexStreaming, context);
return base.DuplexStreamingServerHandler(requestStream, responseStream, context, continuation);
}
private void LogCall<TRequest, TResponse>(MethodType methodType, ServerCallContext context)
where TRequest : class
where TResponse : class
{
_logger.LogWarning($"Starting call. Type: {methodType}. Request: {typeof(TRequest)}. Response: {typeof(TResponse)}");
WriteMetadata(context.RequestHeaders, "caller-user");
WriteMetadata(context.RequestHeaders, "caller-machine");
WriteMetadata(context.RequestHeaders, "caller-os");
void WriteMetadata(Metadata headers, string key)
{
var headerValue = headers.SingleOrDefault(h => h.Key == key)?.Value;
_logger.LogWarning($"{key}: {headerValue ?? "(unknown)"}");
}
}
}
}