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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.Collections.Generic;
using System.Linq;
using System.Runtime.InteropServices;
using System.Threading;
using System.Threading.Tasks;
using Grpc.Core.Internal;
namespace Grpc.Core
{
/// <summary>
/// gRPC Channel
/// </summary>
public class Channel : IDisposable
{
readonly GrpcEnvironment environment;
readonly ChannelSafeHandle handle;
readonly List<ChannelOption> options;
readonly string target;
bool disposed;
/// <summary>
/// Creates a channel that connects to a specific host.
/// Port will default to 80 for an unsecure channel and to 443 a secure channel.
/// </summary>
/// <param name="host">The DNS name of IP address of the host.</param>
/// <param name="credentials">Credentials to secure the channel.</param>
/// <param name="options">Channel options.</param>
public Channel(string host, Credentials credentials, IEnumerable<ChannelOption> options = null)
{
this.environment = GrpcEnvironment.GetInstance();
this.options = options != null ? new List<ChannelOption>(options) : new List<ChannelOption>();
EnsureUserAgentChannelOption(this.options);
using (CredentialsSafeHandle nativeCredentials = credentials.ToNativeCredentials())
using (ChannelArgsSafeHandle nativeChannelArgs = ChannelOptions.CreateChannelArgs(this.options))
{
if (nativeCredentials != null)
{
this.handle = ChannelSafeHandle.CreateSecure(nativeCredentials, host, nativeChannelArgs);
}
else
{
this.handle = ChannelSafeHandle.CreateInsecure(host, nativeChannelArgs);
}
}
this.target = GetOverridenTarget(host, this.options);
}
/// <summary>
/// Creates a channel that connects to a specific host and port.
/// </summary>
/// <param name="host">DNS name or IP address</param>
/// <param name="port">the port</param>
/// <param name="credentials">Credentials to secure the channel.</param>
/// <param name="options">Channel options.</param>
public Channel(string host, int port, Credentials credentials, IEnumerable<ChannelOption> options = null) :
this(string.Format("{0}:{1}", host, port), credentials, options)
{
}
public void Dispose()
{
Dispose(true);
GC.SuppressFinalize(this);
}
internal string Target
{
get
{
return target;
}
}
internal ChannelSafeHandle Handle
{
get
{
return this.handle;
}
}
internal CompletionQueueSafeHandle CompletionQueue
{
get
{
return this.environment.CompletionQueue;
}
}
internal CompletionRegistry CompletionRegistry
{
get
{
return this.environment.CompletionRegistry;
}
}
internal GrpcEnvironment Environment
{
get
{
return this.environment;
}
}
protected virtual void Dispose(bool disposing)
{
if (disposing && handle != null && !disposed)
{
disposed = true;
handle.Dispose();
}
}
private static void EnsureUserAgentChannelOption(List<ChannelOption> options)
{
if (!options.Any((option) => option.Name == ChannelOptions.PrimaryUserAgentString))
{
options.Add(new ChannelOption(ChannelOptions.PrimaryUserAgentString, GetUserAgentString()));
}
}
private static string GetUserAgentString()
{
// TODO(jtattermusch): it would be useful to also provide .NET/mono version.
return string.Format("grpc-csharp/{0}", VersionInfo.CurrentVersion);
}
/// <summary>
/// Look for SslTargetNameOverride option and return its value instead of originalTarget
/// if found.
/// </summary>
private static string GetOverridenTarget(string originalTarget, IEnumerable<ChannelOption> options)
{
if (options == null)
{
return originalTarget;
}
foreach (var option in options)
{
if (option.Type == ChannelOption.OptionType.String
&& option.Name == ChannelOptions.SslTargetNameOverride)
{
return option.StringValue;
}
}
return originalTarget;
}
}
}
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