286 lines
8.1 KiB
JavaScript
286 lines
8.1 KiB
JavaScript
'use strict';
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var REDIS_PREFIX = 'batch:jobs:';
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var REDIS_DB = 5;
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var JobStatus = require('./job_status');
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var queue = require('queue-async');
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var debug = require('./util/debug')('job-backend');
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function JobBackend(metadataBackend, jobQueue) {
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this.metadataBackend = metadataBackend;
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this.jobQueue = jobQueue;
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this.maxNumberOfQueuedJobs = global.settings.batch_max_queued_jobs || 64;
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this.inSecondsJobTTLAfterFinished = global.settings.finished_jobs_ttl_in_seconds || 2 * 3600; // 2 hours
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this.hostname = global.settings.api_hostname || 'batch';
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}
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function toRedisParams(job) {
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var redisParams = [REDIS_PREFIX + job.job_id];
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var obj = JSON.parse(JSON.stringify(job));
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delete obj.job_id;
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for (var property in obj) {
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if (obj.hasOwnProperty(property)) {
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redisParams.push(property);
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if (property === 'query' && typeof obj[property] !== 'string') {
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redisParams.push(JSON.stringify(obj[property]));
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} else {
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redisParams.push(obj[property]);
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}
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}
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}
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return redisParams;
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}
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function toObject(job_id, redisParams, redisValues) {
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var obj = {};
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redisParams.shift(); // job_id value
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redisParams.pop(); // WARN: weird function pushed by metadataBackend
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for (var i = 0; i < redisParams.length; i++) {
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// TODO: this should be moved to job model
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if (redisParams[i] === 'query') {
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try {
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obj[redisParams[i]] = JSON.parse(redisValues[i]);
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} catch (e) {
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obj[redisParams[i]] = redisValues[i];
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}
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} else if (redisValues[i]) {
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obj[redisParams[i]] = redisValues[i];
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}
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}
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obj.job_id = job_id; // adds redisKey as object property
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return obj;
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}
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function isJobFound(redisValues) {
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return !!(redisValues[0] && redisValues[1] && redisValues[2] && redisValues[3] && redisValues[4]);
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}
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function getNotFoundError(job_id) {
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var notFoundError = new Error('Job with id ' + job_id + ' not found');
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notFoundError.name = 'NotFoundError';
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return notFoundError;
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}
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JobBackend.prototype.get = function (job_id, callback) {
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if (!job_id) {
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return callback(getNotFoundError(job_id));
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}
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var self = this;
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var redisParams = [
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REDIS_PREFIX + job_id,
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'user',
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'status',
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'query',
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'created_at',
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'updated_at',
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'host',
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'failed_reason',
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'fallback_status'
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];
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self.metadataBackend.redisCmd(REDIS_DB, 'HMGET', redisParams , function (err, redisValues) {
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if (err) {
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return callback(err);
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}
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if (!isJobFound(redisValues)) {
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return callback(getNotFoundError(job_id));
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}
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var jobData = toObject(job_id, redisParams, redisValues);
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callback(null, jobData);
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});
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};
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JobBackend.prototype.create = function (job, callback) {
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var self = this;
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this.jobQueue.size(job.user, function(err, size) {
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if (err) {
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return callback(new Error('Failed to create job, could not determine user queue size'));
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}
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if (size >= self.maxNumberOfQueuedJobs) {
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return callback(new Error(
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'Failed to create job. ' +
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'Max number of jobs (' + self.maxNumberOfQueuedJobs + ') queued reached'
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));
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}
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self.get(job.job_id, function (err) {
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if (err && err.name !== 'NotFoundError') {
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return callback(err);
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}
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self.save(job, function (err, jobSaved) {
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if (err) {
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return callback(err);
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}
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self.jobQueue.enqueue(job.user, job.job_id, function (err) {
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if (err) {
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return callback(err);
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}
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return callback(null, jobSaved);
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});
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});
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});
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});
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};
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JobBackend.prototype.update = function (job, callback) {
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var self = this;
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self.get(job.job_id, function (err) {
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if (err) {
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return callback(err);
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}
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self.save(job, callback);
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});
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};
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JobBackend.prototype.save = function (job, callback) {
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var self = this;
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var redisParams = toRedisParams(job);
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self.metadataBackend.redisCmd(REDIS_DB, 'HMSET', redisParams , function (err) {
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if (err) {
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return callback(err);
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}
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self.setTTL(job, function (err) {
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if (err) {
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return callback(err);
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}
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self.get(job.job_id, function (err, job) {
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if (err) {
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return callback(err);
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}
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callback(null, job);
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});
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});
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});
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};
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var WORK_IN_PROGRESS_JOB = {
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DB: 5,
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PREFIX_USER: 'batch:wip:user:',
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USER_INDEX_KEY: 'batch:wip:users'
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};
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JobBackend.prototype.addWorkInProgressJob = function (user, jobId, callback) {
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var userWIPKey = WORK_IN_PROGRESS_JOB.PREFIX_USER + user;
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debug('add job %s to user %s (%s)', jobId, user, userWIPKey);
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this.metadataBackend.redisMultiCmd(WORK_IN_PROGRESS_JOB.DB, [
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['SADD', WORK_IN_PROGRESS_JOB.USER_INDEX_KEY, user],
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['RPUSH', userWIPKey, jobId]
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], callback);
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};
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JobBackend.prototype.clearWorkInProgressJob = function (user, jobId, callback) {
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var self = this;
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var DB = WORK_IN_PROGRESS_JOB.DB;
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var userWIPKey = WORK_IN_PROGRESS_JOB.PREFIX_USER + user;
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var params = [userWIPKey, 0, jobId];
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self.metadataBackend.redisCmd(DB, 'LREM', params, function (err) {
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if (err) {
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return callback(err);
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}
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params = [userWIPKey, 0, -1];
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self.metadataBackend.redisCmd(DB, 'LRANGE', params, function (err, workInProgressJobs) {
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if (err) {
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return callback(err);
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}
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debug('user %s has work in progress jobs %j', user, workInProgressJobs);
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if (workInProgressJobs.length < 0) {
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return callback();
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}
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debug('delete user %s from index', user);
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params = [WORK_IN_PROGRESS_JOB.USER_INDEX_KEY, user];
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self.metadataBackend.redisCmd(DB, 'SREM', params, function (err) {
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if (err) {
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return callback(err);
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}
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return callback();
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});
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});
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});
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};
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JobBackend.prototype.listWorkInProgressJobByUser = function (user, callback) {
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var userWIPKey = WORK_IN_PROGRESS_JOB.PREFIX_USER + user;
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var params = [userWIPKey, 0, -1];
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this.metadataBackend.redisCmd(WORK_IN_PROGRESS_JOB.DB, 'LRANGE', params, callback);
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};
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JobBackend.prototype.listWorkInProgressJobs = function (callback) {
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var self = this;
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var DB = WORK_IN_PROGRESS_JOB.DB;
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var params = [WORK_IN_PROGRESS_JOB.USER_INDEX_KEY];
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this.metadataBackend.redisCmd(DB, 'SMEMBERS', params, function (err, workInProgressUsers) {
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if (err) {
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return callback(err);
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}
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if (workInProgressUsers < 1) {
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return callback(null, {});
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}
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debug('found %j work in progress users', workInProgressUsers);
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var usersQueue = queue(4);
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workInProgressUsers.forEach(function (user) {
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usersQueue.defer(self.listWorkInProgressJobByUser.bind(self), user);
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});
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usersQueue.awaitAll(function (err, userWorkInProgressJobs) {
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if (err) {
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return callback(err);
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}
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var workInProgressJobs = workInProgressUsers.reduce(function (users, user, index) {
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users[user] = userWorkInProgressJobs[index];
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debug('found %j work in progress jobs for user %s', userWorkInProgressJobs[index], user);
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return users;
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}, {});
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callback(null, workInProgressJobs);
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});
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});
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};
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JobBackend.prototype.setTTL = function (job, callback) {
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var self = this;
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var redisKey = REDIS_PREFIX + job.job_id;
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if (!JobStatus.isFinal(job.status)) {
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return callback();
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}
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self.metadataBackend.redisCmd(REDIS_DB, 'EXPIRE', [ redisKey, this.inSecondsJobTTLAfterFinished ], callback);
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};
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module.exports = JobBackend;
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