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Diffstat (limited to 'src/csharp/Grpc.HealthCheck/HealthServiceImpl.cs')
-rw-r--r-- | src/csharp/Grpc.HealthCheck/HealthServiceImpl.cs | 132 |
1 files changed, 132 insertions, 0 deletions
diff --git a/src/csharp/Grpc.HealthCheck/HealthServiceImpl.cs b/src/csharp/Grpc.HealthCheck/HealthServiceImpl.cs new file mode 100644 index 0000000000..db3a2a0942 --- /dev/null +++ b/src/csharp/Grpc.HealthCheck/HealthServiceImpl.cs @@ -0,0 +1,132 @@ +#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.Text; +using System.Threading.Tasks; + +using Grpc.Core; +using Grpc.Core.Utils; +using Grpc.Health.V1Alpha; + +namespace Grpc.HealthCheck +{ + /// <summary> + /// Implementation of a simple Health service. Useful for health checking. + /// + /// Registering service with a server: + /// <code> + /// var serviceImpl = new HealthServiceImpl(); + /// server = new Server(); + /// server.AddServiceDefinition(Grpc.Health.V1Alpha.Health.BindService(serviceImpl)); + /// </code> + /// </summary> + public class HealthServiceImpl : Grpc.Health.V1Alpha.Health.IHealth + { + private readonly object myLock = new object(); + private readonly Dictionary<Key, HealthCheckResponse.Types.ServingStatus> statusMap = + new Dictionary<Key, HealthCheckResponse.Types.ServingStatus>(); + + /// <summary> + /// Sets the health status for given host and service. + /// </summary> + /// <param name="host">The host. Cannot be null.</param> + /// <param name="service">The service. Cannot be null.</param> + /// <param name="status">the health status</param> + public void SetStatus(string host, string service, HealthCheckResponse.Types.ServingStatus status) + { + lock (myLock) + { + statusMap[CreateKey(host, service)] = status; + } + } + + /// <summary> + /// Clears health status for given host and service. + /// </summary> + /// <param name="host">The host. Cannot be null.</param> + /// <param name="service">The service. Cannot be null.</param> + public void ClearStatus(string host, string service) + { + lock (myLock) + { + statusMap.Remove(CreateKey(host, service)); + } + } + + /// <summary> + /// Clears statuses for all hosts and services. + /// </summary> + public void ClearAll() + { + lock (myLock) + { + statusMap.Clear(); + } + } + + public Task<HealthCheckResponse> Check(ServerCallContext context, HealthCheckRequest request) + { + lock (myLock) + { + var host = request.HasHost ? request.Host : ""; + var service = request.HasService ? request.Service : ""; + + HealthCheckResponse.Types.ServingStatus status; + if (!statusMap.TryGetValue(CreateKey(host, service), out status)) + { + // TODO(jtattermusch): returning specific status from server handler is not supported yet. + throw new RpcException(new Status(StatusCode.NotFound, "")); + } + return Task.FromResult(HealthCheckResponse.CreateBuilder().SetStatus(status).Build()); + } + } + + private static Key CreateKey(string host, string service) + { + return new Key(host, service); + } + + private struct Key + { + public Key(string host, string service) + { + this.Host = Preconditions.CheckNotNull(host); + this.Service = Preconditions.CheckNotNull(service); + } + + readonly string Host; + readonly string Service; + } + } +} |