| /* |
| * Licensed to the Apache Software Foundation (ASF) under one or more |
| * contributor license agreements. See the NOTICE file distributed with |
| * this work for additional information regarding copyright ownership. |
| * The ASF licenses this file to You 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. |
| */ |
| |
| module.exports = function(logger, utils) { |
| |
| // Active Endpoint |
| this.endPoint = '/active'; |
| |
| var hostMachine = process.env.HOST_MACHINE; |
| |
| this.active = function(req, res) { |
| var method = 'active'; |
| |
| var response = { |
| worker: utils.worker, |
| host: utils.host, |
| hostMachine: hostMachine, |
| active: utils.host === utils.activeHost |
| }; |
| |
| if (req.query && req.query.active) { |
| var query = req.query.active.toLowerCase(); |
| |
| if (query !== 'true' && query !== 'false') { |
| response.error = "Invalid query string"; |
| res.send(response); |
| return; |
| } |
| |
| var redundantHost = utils.host === `${utils.hostPrefix}0` ? `${utils.hostPrefix}1` : `${utils.hostPrefix}0`; |
| var activeHost = query === 'true' ? utils.host : redundantHost; |
| if (utils.activeHost !== activeHost) { |
| if (utils.redisClient) { |
| utils.redisClient.hsetAsync(utils.redisKey, utils.redisField, activeHost) |
| .then(() => { |
| response.active = 'swapping'; |
| utils.redisClient.publish(utils.redisKey, activeHost); |
| logger.info(method, 'Active host swap in progress'); |
| res.send(response); |
| }) |
| .catch(err => { |
| response.error = err; |
| res.send(response); |
| }); |
| } |
| else { |
| response.active = utils.host === activeHost; |
| utils.activeHost = activeHost; |
| var message = 'The active state has changed'; |
| logger.info(method, message, 'to', activeHost); |
| response.message = message; |
| res.send(response); |
| } |
| } |
| else { |
| res.send(response); |
| } |
| } |
| else { |
| res.send(response); |
| } |
| }; |
| |
| }; |