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# 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.
require 'grpc'
require 'grpc/health/v1/health_services_pb'
module Grpc
# Health contains classes and modules that support providing a health check
# service.
module Health
# Checker is implementation of the schema-specified health checking service.
class Checker < V1::Health::Service
StatusCodes = GRPC::Core::StatusCodes
HealthCheckResponse = V1::HealthCheckResponse
# Initializes the statuses of participating services
def initialize
@statuses = {}
@status_mutex = Mutex.new # guards access to @statuses
end
# Implements the rpc IDL API method
def check(req, _call)
status = nil
@status_mutex.synchronize do
status = @statuses["#{req.service}"]
end
if status.nil?
fail GRPC::BadStatus.new_status_exception(StatusCodes::NOT_FOUND)
end
HealthCheckResponse.new(status: status)
end
# Adds the health status for a given service.
def add_status(service, status)
@status_mutex.synchronize { @statuses["#{service}"] = status }
end
# Adds given health status for all given services
def set_status_for_services(status, *services)
@status_mutex.synchronize do
services.each { |service| @statuses["#{service}"] = status }
end
end
# Adds health status for each service given within hash
def add_statuses(service_statuses = {})
@status_mutex.synchronize do
service_statuses.each_pair { |service, status| @statuses["#{service}"] = status }
end
end
# Clears the status for the given service.
def clear_status(service)
@status_mutex.synchronize { @statuses.delete("#{service}") }
end
# Clears alls the statuses.
def clear_all
@status_mutex.synchronize { @statuses = {} }
end
end
end
end
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