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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.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 GetMetadataExceptionStatusMsg = "Exception occurred in metadata credentials plugin.";
const string GetMetadataExceptionLogMsg = GetMetadataExceptionStatusMsg + " This is likely not a problem with gRPC itself. Please verify that the code supplying the metadata (usually an authentication token) works correctly.";
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));
// Make a guarantee that credentials_notify_from_plugin is invoked async to be compliant with c-core API.
ThreadPool.QueueUserWorkItem(async (stateInfo) => await GetMetadataAsync(context, callbackPtr, userDataPtr));
}
catch (Exception e)
{
Native.grpcsharp_metadata_credentials_notify_from_plugin(callbackPtr, userDataPtr, MetadataArraySafeHandle.Create(Metadata.Empty), StatusCode.Unknown, GetMetadataExceptionStatusMsg);
Logger.Error(e, GetMetadataExceptionLogMsg);
}
}
private async Task GetMetadataAsync(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, GetMetadataExceptionStatusMsg);
Logger.Error(e, GetMetadataExceptionLogMsg);
}
}
}
}
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