| #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 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)); |
| // 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, GetMetadataExceptionMsg); |
| Logger.Error(e, GetMetadataExceptionMsg); |
| } |
| } |
| |
| 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, GetMetadataExceptionMsg); |
| Logger.Error(e, GetMetadataExceptionMsg); |
| } |
| } |
| } |
| } |