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#region Copyright notice and license
// Copyright 2015 gRPC authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#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.V1;
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.V1.Health.BindService(serviceImpl));
/// </code>
/// </summary>
public class HealthServiceImpl : Grpc.Health.V1.Health.HealthBase
{
private readonly object myLock = new object();
private readonly Dictionary<string, HealthCheckResponse.Types.ServingStatus> statusMap =
new Dictionary<string, HealthCheckResponse.Types.ServingStatus>();
/// <summary>
/// Sets the health status for given service.
/// </summary>
/// <param name="service">The service. Cannot be null.</param>
/// <param name="status">the health status</param>
public void SetStatus(string service, HealthCheckResponse.Types.ServingStatus status)
{
lock (myLock)
{
statusMap[service] = status;
}
}
/// <summary>
/// Clears health status for given service.
/// </summary>
/// <param name="service">The service. Cannot be null.</param>
public void ClearStatus(string service)
{
lock (myLock)
{
statusMap.Remove(service);
}
}
/// <summary>
/// Clears statuses for all services.
/// </summary>
public void ClearAll()
{
lock (myLock)
{
statusMap.Clear();
}
}
/// <summary>
/// Performs a health status check.
/// </summary>
/// <param name="request">The check request.</param>
/// <param name="context">The call context.</param>
/// <returns>The asynchronous response.</returns>
public override Task<HealthCheckResponse> Check(HealthCheckRequest request, ServerCallContext context)
{
lock (myLock)
{
var service = request.Service;
HealthCheckResponse.Types.ServingStatus status;
if (!statusMap.TryGetValue(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(new HealthCheckResponse { Status = status });
}
}
}
}
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