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#region Copyright notice and license
// Copyright 2015 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;
using System.Collections.Concurrent;
using System.Diagnostics;
using System.IO;
using System.Runtime.InteropServices;
using System.Threading;
namespace Grpc.Core.Internal
{
internal delegate void GprLogDelegate(IntPtr fileStringPtr, int line, ulong threadId, IntPtr severityStringPtr, IntPtr msgPtr);
/// <summary>
/// Logs from gRPC C core library can get lost if your application is not a console app.
/// This class allows redirection of logs to gRPC logger.
/// </summary>
internal static class NativeLogRedirector
{
static object staticLock = new object();
static GprLogDelegate writeCallback;
/// <summary>
/// Redirects logs from native gRPC C core library to a general logger.
/// </summary>
public static void Redirect(NativeMethods native)
{
lock (staticLock)
{
if (writeCallback == null)
{
writeCallback = new GprLogDelegate(HandleWrite);
native.grpcsharp_redirect_log(writeCallback);
}
}
}
private static void HandleWrite(IntPtr fileStringPtr, int line, ulong threadId, IntPtr severityStringPtr, IntPtr msgPtr)
{
try
{
var logger = GrpcEnvironment.Logger;
string severityString = Marshal.PtrToStringAnsi(severityStringPtr);
string message = string.Format("{0} {1}:{2}: {3}",
threadId,
Marshal.PtrToStringAnsi(fileStringPtr),
line,
Marshal.PtrToStringAnsi(msgPtr));
switch (severityString)
{
case "D":
logger.Debug(message);
break;
case "I":
logger.Info(message);
break;
case "E":
logger.Error(message);
break;
default:
// severity not recognized, default to error.
logger.Error(message);
break;
}
}
catch (Exception e)
{
Console.WriteLine("Caught exception in native callback " + e);
}
}
}
}
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