task-history.js
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var redis = require('redis');
var LRU = require('lru-cache');
var config;
var logger;
var redisClient;
var taskHistory = LRU({max: 100, maxAge: 1000 * 3600 * 2});
function createRedisClient(host, port) {
try {
redisClient = redis.createClient(port, host);
logger.verbose(__filename + ': Redis client for task history created');
} catch(err) {
logger.warn(__filename + ": Error creating redis client to " + host + ':' + port);
process.exit(1);
}
}
function init(options) {
if (!options) {
console.log('Undefined options, terminating....');
process.exit(1);
}
if (options.config) {
config = options.config;
} else {
console.log('Undefined options.config, terminating....')
process.exit(1);
}
if (options && options.logger) {
logger = options.logger;
} else {
console.log('Undefined options.logger, terminating....')
process.exit(1);
}
createRedisClient(config.globals.redis_host, config.globals.redis_port);
}
function getKey(task) {
var requestId;
if (typeof task === 'string') {
requestId = task;
} else {
try {
requestId = task.requestId;
}
catch(e) {
return;
}
}
return config.globals.gateway_name + '.smithsonian.hist.rid:' + requestId;
}
function put(task, cb) {
var key = getKey(task, config.globals.gateway_name);
logger.verbose('Saving task to history LRU', {key: key, task: task});
try {
taskHistory.set(key, JSON.parse(JSON.stringify(task)));
} catch (e) { }
putToRedis(task, cb);
}
function putToRedis(task, cb) {
if (!redisClient) {
logger.verbose('Not saving to redis because of undefined redisClient')
if (cb) { cb(); }
return;
}
var key = getKey(task, config.globals.gateway_name);
logger.verbose('Saving task to redis', {key: key, task: task});
redisClient.set(key, JSON.stringify(task), function() {
redisClient.expire(key, 3600*24*30);
if (cb) {
cb();
}
});
}
function get(task, cb) {
logger.verbose('Getting task from history', {task: task});
var key = getKey(task, config.globals.gateway_name);
var archive = taskHistory.get(key);
if (archive) {
if (cb) { cb(null, archive); }
}
else {
getFromRedis(task, cb);
}
}
function getFromRedis(task, cb) {
if (!redisClient) {
if (cb) { cb(null, null); }
return;
}
var key = getKey(task, config.globals.gateway_name);
redisClient.get(key, function(err, result) {
if (err) {
logger.warn('Error retrieving task from redis', {err: err});
cb(err, null);
return;
}
var task;
try {
task = JSON.parse(result);
}
catch(e) {
logger.warn('Exception on parsing redis result as a json', {err: e});
cb(e, null);
}
cb(null, task);
})
}
exports.init = init;
exports.get = get;
exports.put = put;