1# Copyright 2015 gRPC authors. 2# 3# Licensed under the Apache License, Version 2.0 (the "License"); 4# you may not use this file except in compliance with the License. 5# You may obtain a copy of the License at 6# 7# http://www.apache.org/licenses/LICENSE-2.0 8# 9# Unless required by applicable law or agreed to in writing, software 10# distributed under the License is distributed on an "AS IS" BASIS, 11# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 12# See the License for the specific language governing permissions and 13# limitations under the License. 14 15require 'grpc' 16require 'grpc/health/v1/health_services_pb' 17 18module Grpc 19 # Health contains classes and modules that support providing a health check 20 # service. 21 module Health 22 # Checker is implementation of the schema-specified health checking service. 23 class Checker < V1::Health::Service 24 StatusCodes = GRPC::Core::StatusCodes 25 HealthCheckResponse = V1::HealthCheckResponse 26 27 # Initializes the statuses of participating services 28 def initialize 29 @statuses = {} 30 @status_mutex = Mutex.new # guards access to @statuses 31 end 32 33 # Implements the rpc IDL API method 34 def check(req, _call) 35 status = nil 36 @status_mutex.synchronize do 37 status = @statuses["#{req.service}"] 38 end 39 if status.nil? 40 fail GRPC::BadStatus.new_status_exception(StatusCodes::NOT_FOUND) 41 end 42 HealthCheckResponse.new(status: status) 43 end 44 45 # Adds the health status for a given service. 46 def add_status(service, status) 47 @status_mutex.synchronize { @statuses["#{service}"] = status } 48 end 49 50 # Adds given health status for all given services 51 def set_status_for_services(status, *services) 52 @status_mutex.synchronize do 53 services.each { |service| @statuses["#{service}"] = status } 54 end 55 end 56 57 # Adds health status for each service given within hash 58 def add_statuses(service_statuses = {}) 59 @status_mutex.synchronize do 60 service_statuses.each_pair { |service, status| @statuses["#{service}"] = status } 61 end 62 end 63 64 # Clears the status for the given service. 65 def clear_status(service) 66 @status_mutex.synchronize { @statuses.delete("#{service}") } 67 end 68 69 # Clears alls the statuses. 70 def clear_all 71 @status_mutex.synchronize { @statuses = {} } 72 end 73 end 74 end 75end 76