| # 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 |
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| # A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
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| # OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| |
| require 'grpc' |
| require 'grpc/health/v1/health_services_pb' |
| 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 |