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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.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();
}
}
/// <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 Task<HealthCheckResponse> Check(HealthCheckRequest request, ServerCallContext context)
{
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;
}
}
}
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