Initial checkin of gRPC to third_party/

third_party/grpc/src/csharp/Grpc.Core/Internal/NativeLogRedirector.cs

Index: third_party/grpc/src/csharp/Grpc.Core/Internal/NativeLogRedirector.cs
diff --git a/third_party/grpc/src/csharp/Grpc.Core/Internal/NativeLogRedirector.cs b/third_party/grpc/src/csharp/Grpc.Core/Internal/NativeLogRedirector.cs
new file mode 100644
index 0000000000000000000000000000000000000000..4bbbb4808caaaf212771d6f0c3b7930a3757eb2f
--- /dev/null
+++ b/third_party/grpc/src/csharp/Grpc.Core/Internal/NativeLogRedirector.cs
@@ -0,0 +1,104 @@
+#region Copyright notice and license
+
+// Copyright 2015-2016, 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, 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);
+            }
+        }
+    }
+}