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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.Threading;
using System.Threading.Tasks;
using Grpc.Core.Internal;
namespace Grpc.Core
{
/// <summary>
/// Context for a server-side call.
/// </summary>
public class ServerCallContext
{
private readonly CallSafeHandle callHandle;
private readonly string method;
private readonly string host;
private readonly DateTime deadline;
private readonly Metadata requestHeaders;
private readonly CancellationToken cancellationToken;
private readonly Metadata responseTrailers = new Metadata();
private Status status = Status.DefaultSuccess;
private Func<Metadata, Task> writeHeadersFunc;
private IHasWriteOptions writeOptionsHolder;
private Lazy<AuthContext> authContext;
internal ServerCallContext(CallSafeHandle callHandle, string method, string host, DateTime deadline, Metadata requestHeaders, CancellationToken cancellationToken,
Func<Metadata, Task> writeHeadersFunc, IHasWriteOptions writeOptionsHolder)
{
this.callHandle = callHandle;
this.method = method;
this.host = host;
this.deadline = deadline;
this.requestHeaders = requestHeaders;
this.cancellationToken = cancellationToken;
this.writeHeadersFunc = writeHeadersFunc;
this.writeOptionsHolder = writeOptionsHolder;
this.authContext = new Lazy<AuthContext>(GetAuthContextEager);
}
/// <summary>
/// Asynchronously sends response headers for the current call to the client. This method may only be invoked once for each call and needs to be invoked
/// before any response messages are written. Writing the first response message implicitly sends empty response headers if <c>WriteResponseHeadersAsync</c> haven't
/// been called yet.
/// </summary>
/// <param name="responseHeaders">The response headers to send.</param>
/// <returns>The task that finished once response headers have been written.</returns>
public Task WriteResponseHeadersAsync(Metadata responseHeaders)
{
return writeHeadersFunc(responseHeaders);
}
/// <summary>
/// Creates a propagation token to be used to propagate call context to a child call.
/// </summary>
public ContextPropagationToken CreatePropagationToken(ContextPropagationOptions options = null)
{
return new ContextPropagationToken(callHandle, deadline, cancellationToken, options);
}
/// <summary>Name of method called in this RPC.</summary>
public string Method
{
get
{
return this.method;
}
}
/// <summary>Name of host called in this RPC.</summary>
public string Host
{
get
{
return this.host;
}
}
/// <summary>Address of the remote endpoint in URI format.</summary>
public string Peer
{
get
{
// Getting the peer lazily is fine as the native call is guaranteed
// not to be disposed before user-supplied server side handler returns.
// Most users won't need to read this field anyway.
return this.callHandle.GetPeer();
}
}
/// <summary>Deadline for this RPC.</summary>
public DateTime Deadline
{
get
{
return this.deadline;
}
}
/// <summary>Initial metadata sent by client.</summary>
public Metadata RequestHeaders
{
get
{
return this.requestHeaders;
}
}
/// <summary>Cancellation token signals when call is cancelled.</summary>
public CancellationToken CancellationToken
{
get
{
return this.cancellationToken;
}
}
/// <summary>Trailers to send back to client after RPC finishes.</summary>
public Metadata ResponseTrailers
{
get
{
return this.responseTrailers;
}
}
/// <summary> Status to send back to client after RPC finishes.</summary>
public Status Status
{
get
{
return this.status;
}
set
{
status = value;
}
}
/// <summary>
/// Allows setting write options for the following write.
/// For streaming response calls, this property is also exposed as on IServerStreamWriter for convenience.
/// Both properties are backed by the same underlying value.
/// </summary>
public WriteOptions WriteOptions
{
get
{
return writeOptionsHolder.WriteOptions;
}
set
{
writeOptionsHolder.WriteOptions = value;
}
}
/// <summary>
/// Gets the <c>AuthContext</c> associated with this call.
/// Note: Access to AuthContext is an experimental API that can change without any prior notice.
/// </summary>
public AuthContext AuthContext
{
get
{
return authContext.Value;
}
}
private AuthContext GetAuthContextEager()
{
using (var authContextNative = callHandle.GetAuthContext())
{
return authContextNative.ToAuthContext();
}
}
}
/// <summary>
/// Allows sharing write options between ServerCallContext and other objects.
/// </summary>
public interface IHasWriteOptions
{
/// <summary>
/// Gets or sets the write options.
/// </summary>
WriteOptions WriteOptions { get; set; }
}
}
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