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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.Text.RegularExpressions;
using System.Threading.Tasks;
namespace Grpc.Core
{
/// <summary>
/// Interceptor for call headers.
/// </summary>
public delegate void HeaderInterceptor(IMethod method, string authUri, Metadata metadata);
/// <summary>
/// Base class for client-side stubs.
/// </summary>
public abstract class ClientBase
{
// Regex for removal of the optional DNS scheme, trailing port, and trailing backslash
static readonly Regex ChannelTargetPattern = new Regex(@"^(dns:\/{3})?([^:\/]+)(:\d+)?\/?$");
readonly Channel channel;
readonly string authUriBase;
/// <summary>
/// Initializes a new instance of <c>ClientBase</c> class.
/// </summary>
/// <param name="channel">The channel to use for remote call invocation.</param>
public ClientBase(Channel channel)
{
this.channel = channel;
this.authUriBase = GetAuthUriBase(channel.Target);
}
/// <summary>
/// Can be used to register a custom header (request metadata) interceptor.
/// The interceptor is invoked each time a new call on this client is started.
/// </summary>
public HeaderInterceptor HeaderInterceptor
{
get;
set;
}
/// <summary>
/// gRPC supports multiple "hosts" being served by a single server.
/// This property can be used to set the target host explicitly.
/// By default, this will be set to <c>null</c> with the meaning
/// "use default host".
/// </summary>
public string Host
{
get;
set;
}
/// <summary>
/// Channel associated with this client.
/// </summary>
public Channel Channel
{
get
{
return this.channel;
}
}
/// <summary>
/// Creates a new call to given method.
/// </summary>
/// <param name="method">The method to invoke.</param>
/// <param name="options">The call options.</param>
/// <typeparam name="TRequest">Request message type.</typeparam>
/// <typeparam name="TResponse">Response message type.</typeparam>
/// <returns>The call invocation details.</returns>
protected CallInvocationDetails<TRequest, TResponse> CreateCall<TRequest, TResponse>(Method<TRequest, TResponse> method, CallOptions options)
where TRequest : class
where TResponse : class
{
var interceptor = HeaderInterceptor;
if (interceptor != null)
{
if (options.Headers == null)
{
options = options.WithHeaders(new Metadata());
}
var authUri = authUriBase != null ? authUriBase + method.ServiceName : null;
interceptor(method, authUri, options.Headers);
}
return new CallInvocationDetails<TRequest, TResponse>(channel, method, Host, options);
}
/// <summary>
/// Creates Auth URI base from channel's target (the one passed at channel creation).
/// Fully-qualified service name is to be appended to this.
/// </summary>
internal static string GetAuthUriBase(string target)
{
var match = ChannelTargetPattern.Match(target);
if (!match.Success)
{
return null;
}
return "https://" + match.Groups[2].Value + "/";
}
}
}
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