1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 | 2× 2× 2× 2× 2× 2× 2× 2× 2× 2× 2× 2× 2× 2× 4× 2× 2× 2× 2× 2× 2× 2× 2× 2× 2× 2× 2× 2× 2× 2× 2× 2× 2× 2× 2× 2× 306× 2× 2× 2× 2× 6649× 6649× 6649× 228× 6649× 6649× 5571× 1078× 539× 539× 539× 2× 114× 2× 5278× 2× 2561× 2561× 2561× 2561× 2× 2× 2× 2× 2× 2× 2× 2× 2× 2× 2× 2× 2× 2× 2× 412× 412× 412× | 'use strict'; const _ = require('lodash'); const Q = require('q'); const redis = require('redis'); const IORedis = require('ioredis'); const config = require(__dirname + '/../config'); const logger = require(__dirname + '/../loggers/logger'); //export namespace as `redisHelper` const redisHelper = exports; let redisClient = null; let redisClientReady = false; let sharedRedisClient = null; let initRedis = function () { let deferred = Q.defer(); const promise = deferred.promise; const notify = () => { if (deferred) { const d = deferred; deferred = undefined; d.resolve(); } }; Eif (config.pnr_squid.local_safeview) { var endpoint = { host: config['redis-sv'].host, port: config['redis-sentinel'].port, db: config['redis-sv'].db_partition }; sharedRedisClient = new IORedis({ sentinels: [endpoint], name: 'redis-sv', password: config['redis-sv'].password }); } redisClient = redis.createClient( config.networking.redis_port, config.networking.local_redis_host, {}); //Options Eif (config.networking.redis_password) { redisClient.auth(config.networking.redis_password, function (err) { Iif (err) { logger.error('Redis Auth Error - ' + err); redisClientReady = false; } else { logger.info('Redis Auth succeeded'); redisClientReady = true; } notify(); }); } redisClient.on('ready', function () { logger.info('Redis connection ready'); redisClientReady = true; notify(); }); redisClient.on('error', function (err) { logger.error('Redis Error - ' + err); redisClientReady = false; notify(); }); redisClient.on('end', function () { logger.error('Redis connection terminated'); redisClientReady = false; notify(); }); return promise; }; redisHelper.initializeRedis = function () { if (!redisClientReady) { Iif (redisClient) { logger.info('Closing redis client'); redisClient.quit(); redisClient = null; } logger.info('Trying to reinitialize redis connection'); return initRedis(); } }; redisHelper.getDataFromRedisWithRetries = function (key, retries, retryDelay, shared) { Iif (!redisClientReady) { logger.warn('Redis connection not available. Retry after some time.'); redisHelper.initializeRedis(); return null; } let qRedisClientGet = Q.nbind(redisClient.get, redisClient); if (shared && sharedRedisClient) { qRedisClientGet = Q.nbind(sharedRedisClient.get, sharedRedisClient); } return qRedisClientGet(key) .then(function (content) { if (content) { return JSON.parse(content); } if (retries === 0) { return null; } return Q.delay(retryDelay) .then(function () { return redisHelper.getDataFromRedisWithRetries( key, retries - 1, retryDelay, shared); }); }) .fail(function (error) { logger.warn('msg="Error getting data from redis" ' + 'error="' + error + '" key=' + key); return null; }); }; redisHelper.getDataFromSharedRedis = function(key) { return redisHelper.getDataFromRedisWithRetries( key, 1 /* retries */, 0 /* retryDelay */, true /* shared */); }; redisHelper.getDataFromRedis = function (key) { return redisHelper.getDataFromRedisWithRetries( key, 1 /*retries*/, 0 /*retryDelay*/); }; redisHelper.setDataInRedis = function (key, value, expiresAfter) { Iif (!redisClientReady) { logger.warn('Redis connection not available. Retry after some time.'); redisHelper.initializeRedis(); return; } expiresAfter = expiresAfter || 300; let qRedisClientSetEx = Q.nbind(redisClient.setex, redisClient); return qRedisClientSetEx(key, expiresAfter, JSON.stringify(value)); }; redisHelper.checkClientReady = () => redisClientReady? new Q(): Q.when(redisHelper.initializeRedis()) .then(() => Q.reject('Redis connection not available')); redisHelper.hset = (hash, key, value) => redisHelper.checkClientReady() .then(() => Q.nbind(redisClient.hset, redisClient)(hash, key, value)); const CHUNK_SIZE = 1000; redisHelper.bulkLoad = (hash, kv) => redisHelper.checkClientReady() .then(() => { const qRedisHmset = Q.nbind(redisClient.hmset, redisClient); const qs = []; for(let i = 0; i < kv.length; i+=CHUNK_SIZE) { qs.push(kv.slice(i, i + CHUNK_SIZE) .reduce((a,b) => a.concat(b), [hash]) ); } return qs.reduce((a, s) => a.then(() => qRedisHmset(s)), new Q()); }); redisHelper.hmget = function() { const args = Array.from(arguments); return redisHelper.checkClientReady() .then(() => Q.nbind(redisClient.hmget, redisClient)(args)); }; redisHelper.acquireLock = function (lock, expiryTime) { Iif (!redisClientReady) { logger.warn('Redis connection not available. Retry after some time.'); redisHelper.initializeRedis(); return false; } //We are going to use redis setnx (set if not exists) as a lock for //${expiryTime} seconds. This solution is based on - //https://engineering.gosquared.com/distributed-locks-using-redis var redisMultiDeferred = Q.defer(); redisClient.multi() .set([lock, 1, 'NX', 'EX', expiryTime]) .exec(function (err, replies) { let result = false; Eif (!err && replies) { result = _.contains(replies, 'OK'); } redisMultiDeferred.resolve(result); }); return redisMultiDeferred.promise; }; redisHelper.deleteKeyInRedis = function (key) { Iif (!redisClientReady) { logger.warn('Redis connection not available. Retry after some time.'); redisHelper.initializeRedis(); return; } let qRedisClientDel = Q.nbind(redisClient.del, redisClient); return qRedisClientDel(key); }; |