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#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.Runtime.InteropServices;
using System.Threading;
using System.Threading.Tasks;
using Grpc.Core.Logging;
using Grpc.Core.Utils;
namespace Grpc.Core.Internal
{
internal delegate void NativeMetadataInterceptor(IntPtr statePtr, IntPtr serviceUrlPtr, IntPtr methodNamePtr, IntPtr callbackPtr, IntPtr userDataPtr, bool isDestroy);
internal class NativeMetadataCredentialsPlugin
{
const string GetMetadataExceptionMsg = "Exception occured in metadata credentials plugin.";
static readonly ILogger Logger = GrpcEnvironment.Logger.ForType<NativeMetadataCredentialsPlugin>();
static readonly NativeMethods Native = NativeMethods.Get();
AsyncAuthInterceptor interceptor;
GCHandle gcHandle;
NativeMetadataInterceptor nativeInterceptor;
CallCredentialsSafeHandle credentials;
public NativeMetadataCredentialsPlugin(AsyncAuthInterceptor interceptor)
{
this.interceptor = GrpcPreconditions.CheckNotNull(interceptor, "interceptor");
this.nativeInterceptor = NativeMetadataInterceptorHandler;
// Make sure the callback doesn't get garbage collected until it is destroyed.
this.gcHandle = GCHandle.Alloc(this.nativeInterceptor, GCHandleType.Normal);
this.credentials = Native.grpcsharp_metadata_credentials_create_from_plugin(nativeInterceptor);
}
public CallCredentialsSafeHandle Credentials
{
get { return credentials; }
}
private void NativeMetadataInterceptorHandler(IntPtr statePtr, IntPtr serviceUrlPtr, IntPtr methodNamePtr, IntPtr callbackPtr, IntPtr userDataPtr, bool isDestroy)
{
if (isDestroy)
{
gcHandle.Free();
return;
}
try
{
var context = new AuthInterceptorContext(Marshal.PtrToStringAnsi(serviceUrlPtr),
Marshal.PtrToStringAnsi(methodNamePtr));
StartGetMetadata(context, callbackPtr, userDataPtr);
}
catch (Exception e)
{
Native.grpcsharp_metadata_credentials_notify_from_plugin(callbackPtr, userDataPtr, MetadataArraySafeHandle.Create(Metadata.Empty), StatusCode.Unknown, GetMetadataExceptionMsg);
Logger.Error(e, GetMetadataExceptionMsg);
}
}
private async void StartGetMetadata(AuthInterceptorContext context, IntPtr callbackPtr, IntPtr userDataPtr)
{
try
{
var metadata = new Metadata();
await interceptor(context, metadata).ConfigureAwait(false);
using (var metadataArray = MetadataArraySafeHandle.Create(metadata))
{
Native.grpcsharp_metadata_credentials_notify_from_plugin(callbackPtr, userDataPtr, metadataArray, StatusCode.OK, null);
}
}
catch (Exception e)
{
Native.grpcsharp_metadata_credentials_notify_from_plugin(callbackPtr, userDataPtr, MetadataArraySafeHandle.Create(Metadata.Empty), StatusCode.Unknown, GetMetadataExceptionMsg);
Logger.Error(e, GetMetadataExceptionMsg);
}
}
}
}
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