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Diffstat (limited to 'src/csharp/Grpc.Core/ContextPropagationToken.cs')
| -rw-r--r-- | src/csharp/Grpc.Core/ContextPropagationToken.cs | 171 |
1 files changed, 171 insertions, 0 deletions
diff --git a/src/csharp/Grpc.Core/ContextPropagationToken.cs b/src/csharp/Grpc.Core/ContextPropagationToken.cs new file mode 100644 index 0000000000..2e4bfc9e47 --- /dev/null +++ b/src/csharp/Grpc.Core/ContextPropagationToken.cs @@ -0,0 +1,171 @@ +#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 Grpc.Core.Internal; +using Grpc.Core.Utils; + +namespace Grpc.Core +{ + /// <summary> + /// Token for propagating context of server side handlers to child calls. + /// In situations when a backend is making calls to another backend, + /// it makes sense to propagate properties like deadline and cancellation + /// token of the server call to the child call. + /// C core provides some other contexts (like tracing context) that + /// are not accessible to C# layer, but this token still allows propagating them. + /// </summary> + public class ContextPropagationToken + { + /// <summary> + /// Default propagation mask used by C core. + /// </summary> + private const ContextPropagationFlags DefaultCoreMask = (ContextPropagationFlags)0xffff; + + /// <summary> + /// Default propagation mask used by C# - we want to propagate deadline + /// and cancellation token by our own means. + /// </summary> + internal const ContextPropagationFlags DefaultMask = DefaultCoreMask + & ~ContextPropagationFlags.Deadline & ~ContextPropagationFlags.Cancellation; + + readonly CallSafeHandle parentCall; + readonly DateTime deadline; + readonly CancellationToken cancellationToken; + readonly ContextPropagationOptions options; + + internal ContextPropagationToken(CallSafeHandle parentCall, DateTime deadline, CancellationToken cancellationToken, ContextPropagationOptions options) + { + this.parentCall = Preconditions.CheckNotNull(parentCall); + this.deadline = deadline; + this.cancellationToken = cancellationToken; + this.options = options ?? ContextPropagationOptions.Default; + } + + /// <summary> + /// Gets the native handle of the parent call. + /// </summary> + internal CallSafeHandle ParentCall + { + get + { + return this.parentCall; + } + } + + /// <summary> + /// Gets the parent call's deadline. + /// </summary> + internal DateTime ParentDeadline + { + get + { + return this.deadline; + } + } + + /// <summary> + /// Gets the parent call's cancellation token. + /// </summary> + internal CancellationToken ParentCancellationToken + { + get + { + return this.cancellationToken; + } + } + + /// <summary> + /// Get the context propagation options. + /// </summary> + internal ContextPropagationOptions Options + { + get + { + return this.options; + } + } + } + + /// <summary> + /// Options for <see cref="ContextPropagationToken"/>. + /// </summary> + public class ContextPropagationOptions + { + /// <summary> + /// The context propagation options that will be used by default. + /// </summary> + public static readonly ContextPropagationOptions Default = new ContextPropagationOptions(); + + bool propagateDeadline; + bool propagateCancellation; + + + /// <summary> + /// Creates new context propagation options. + /// </summary> + /// <param name="propagateDeadline">If set to <c>true</c> parent call's deadline will be propagated to the child call.</param> + /// <param name="propagateCancellation">If set to <c>true</c> parent call's cancellation token will be propagated to the child call.</param> + public ContextPropagationOptions(bool propagateDeadline = true, bool propagateCancellation = true) + { + this.propagateDeadline = propagateDeadline; + this.propagateCancellation = propagateCancellation; + } + + /// <value><c>true</c> if parent call's deadline should be propagated to the child call.</value> + public bool IsPropagateDeadline + { + get { return this.propagateDeadline; } + } + + /// <value><c>true</c> if parent call's cancellation token should be propagated to the child call.</value> + public bool IsPropagateCancellation + { + get { return this.propagateCancellation; } + } + } + + /// <summary> + /// Context propagation flags from grpc/grpc.h. + /// </summary> + [Flags] + internal enum ContextPropagationFlags + { + Deadline = 1, + CensusStatsContext = 2, + CensusTracingContext = 4, + Cancellation = 8 + } +} |