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# Copyright 2015-2016, 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.
require 'grpc'
require 'grpc/health/v1/health_services'
require 'thread'
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
fail GRPC::BadStatus, StatusCodes::NOT_FOUND if status.nil?
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
# 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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