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| '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);
};
|