82 lines
2.6 KiB
JavaScript
82 lines
2.6 KiB
JavaScript
'use strict';
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var errorCodes = require('../app/postgresql/error_codes');
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var PSQL = require('cartodb-psql');
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var QUERY_CANCELED = '57014';
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function JobRunner(jobBackend, userDatabaseMetadataService) {
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this.jobBackend = jobBackend;
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this.userDatabaseMetadataService = userDatabaseMetadataService;
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}
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JobRunner.prototype.run = function (job_id, callback) {
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var self = this;
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self.jobBackend.get(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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if (job.status !== 'pending') {
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var error = new Error('Cannot run job ' + job.job_id + ' due to its status is ' + job.status);
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error.name = 'InvalidJobStatus';
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return callback(error);
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}
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self.userDatabaseMetadataService.getUserMetadata(job.user, function (err, userDatabaseMetadata) {
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if (err) {
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return callback(err);
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}
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self.jobBackend.setRunning(job, function (err, job) {
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if (err) {
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return callback(err);
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}
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self._query(job, userDatabaseMetadata, callback);
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});
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});
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});
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};
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JobRunner.prototype._query = function (job, userDatabaseMetadata, callback) {
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var self = this;
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var pg = new PSQL(userDatabaseMetadata, {}, { destroyOnError: true });
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pg.query('SET statement_timeout=0', function (err) {
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if(err) {
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return self.jobBackend.setFailed(job, err, callback);
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}
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// mark query to allow to users cancel their queries whether users request for it
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var sql = job.query + ' /* ' + job.job_id + ' */';
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pg.eventedQuery(sql, function (err, query) {
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if (err) {
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return self.jobBackend.setFailed(job, err, callback);
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}
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query.on('error', function (err) {
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// if query has been cancelled then it's going to get the current job status saved by query_canceller
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if (errorCodes[err.code] === 'query_canceled') {
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return self.jobBackend.get(job.job_id, callback);
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}
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self.jobBackend.setFailed(job, err, callback);
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});
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query.on('end', function (result) {
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// only if result is present then query is done sucessfully otherwise an error has happened
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// and it was handled by error listener
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if (result) {
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return self.jobBackend.setDone(job, callback);
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}
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});
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});
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});
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};
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module.exports = JobRunner;
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