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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.Runtime.InteropServices;
using System.Threading;
using System.Threading.Tasks;
namespace Grpc.Core.Internal
{
/// <summary>
/// grpc_channel from <grpc/grpc.h>
/// </summary>
internal class ChannelSafeHandle : SafeHandleZeroIsInvalid
{
[DllImport("grpc_csharp_ext.dll")]
static extern ChannelSafeHandle grpcsharp_insecure_channel_create(string target, ChannelArgsSafeHandle channelArgs);
[DllImport("grpc_csharp_ext.dll")]
static extern ChannelSafeHandle grpcsharp_secure_channel_create(CredentialsSafeHandle credentials, string target, ChannelArgsSafeHandle channelArgs);
[DllImport("grpc_csharp_ext.dll")]
static extern CallSafeHandle grpcsharp_channel_create_call(ChannelSafeHandle channel, CallSafeHandle parentCall, ContextPropagationFlags propagationMask, CompletionQueueSafeHandle cq, string method, string host, Timespec deadline);
[DllImport("grpc_csharp_ext.dll")]
static extern ChannelState grpcsharp_channel_check_connectivity_state(ChannelSafeHandle channel, int tryToConnect);
[DllImport("grpc_csharp_ext.dll")]
static extern void grpcsharp_channel_watch_connectivity_state(ChannelSafeHandle channel, ChannelState lastObservedState,
Timespec deadline, CompletionQueueSafeHandle cq, BatchContextSafeHandle ctx);
[DllImport("grpc_csharp_ext.dll")]
static extern CStringSafeHandle grpcsharp_channel_get_target(ChannelSafeHandle call);
[DllImport("grpc_csharp_ext.dll")]
static extern void grpcsharp_channel_destroy(IntPtr channel);
private ChannelSafeHandle()
{
}
public static ChannelSafeHandle CreateInsecure(string target, ChannelArgsSafeHandle channelArgs)
{
// Increment reference count for the native gRPC environment to make sure we don't do grpc_shutdown() before destroying the server handle.
// Doing so would make object finalizer crash if we end up abandoning the handle.
GrpcEnvironment.GrpcNativeInit();
return grpcsharp_insecure_channel_create(target, channelArgs);
}
public static ChannelSafeHandle CreateSecure(CredentialsSafeHandle credentials, string target, ChannelArgsSafeHandle channelArgs)
{
// Increment reference count for the native gRPC environment to make sure we don't do grpc_shutdown() before destroying the server handle.
// Doing so would make object finalizer crash if we end up abandoning the handle.
GrpcEnvironment.GrpcNativeInit();
return grpcsharp_secure_channel_create(credentials, target, channelArgs);
}
public CallSafeHandle CreateCall(CompletionRegistry registry, CallSafeHandle parentCall, ContextPropagationFlags propagationMask, CompletionQueueSafeHandle cq, string method, string host, Timespec deadline)
{
var result = grpcsharp_channel_create_call(this, parentCall, propagationMask, cq, method, host, deadline);
result.SetCompletionRegistry(registry);
return result;
}
public ChannelState CheckConnectivityState(bool tryToConnect)
{
return grpcsharp_channel_check_connectivity_state(this, tryToConnect ? 1 : 0);
}
public void WatchConnectivityState(ChannelState lastObservedState, Timespec deadline, CompletionQueueSafeHandle cq,
CompletionRegistry completionRegistry, BatchCompletionDelegate callback)
{
var ctx = BatchContextSafeHandle.Create();
completionRegistry.RegisterBatchCompletion(ctx, callback);
grpcsharp_channel_watch_connectivity_state(this, lastObservedState, deadline, cq, ctx);
}
public string GetTarget()
{
using (var cstring = grpcsharp_channel_get_target(this))
{
return cstring.GetValue();
}
}
protected override bool ReleaseHandle()
{
grpcsharp_channel_destroy(handle);
GrpcEnvironment.GrpcNativeShutdown();
return true;
}
}
}
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