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#region Copyright notice and license
// Copyright 2015, Google Inc.
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
// * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
// * Redistributions in binary form must reproduce the above
// copyright notice, this list of conditions and the following disclaimer
// in the documentation and/or other materials provided with the
// distribution.
// * Neither the name of Google Inc. nor the names of its
// contributors may be used to endorse or promote products derived from
// this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#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, Int32 line, UInt64 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 arbitrary destination.
/// </summary>
internal static class GrpcLog
{
static object staticLock = new object();
static GprLogDelegate writeCallback;
static TextWriter dest;
[DllImport("grpc_csharp_ext.dll")]
static extern void grpcsharp_redirect_log(GprLogDelegate callback);
/// <summary>
/// Sets text writer as destination for logs from native gRPC C core library.
/// Only first invocation has effect.
/// </summary>
/// <param name="textWriter"></param>
public static void RedirectNativeLogs(TextWriter textWriter)
{
lock (staticLock)
{
if (writeCallback == null)
{
writeCallback = new GprLogDelegate(HandleWrite);
dest = textWriter;
grpcsharp_redirect_log(writeCallback);
}
}
}
private static void HandleWrite(IntPtr fileStringPtr, Int32 line, UInt64 threadId, IntPtr severityStringPtr, IntPtr msgPtr)
{
try
{
// TODO: DateTime format used here is different than in C core.
dest.WriteLine(string.Format("{0}{1} {2} {3}:{4}: {5}",
Marshal.PtrToStringAnsi(severityStringPtr), DateTime.Now,
threadId,
Marshal.PtrToStringAnsi(fileStringPtr),
line,
Marshal.PtrToStringAnsi(msgPtr)));
}
catch (Exception e)
{
Console.WriteLine("Caught exception in native callback " + e);
}
}
}
}
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