91 lines
2.4 KiB
JavaScript
91 lines
2.4 KiB
JavaScript
'use strict';
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var PSQL = require('cartodb-psql');
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function JobCanceller(metadataBackend, userDatabaseMetadataService, jobBackend) {
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this.metadataBackend = metadataBackend;
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this.userDatabaseMetadataService = userDatabaseMetadataService;
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this.jobBackend = jobBackend;
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}
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JobCanceller.prototype.cancel = 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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return self.jobBackend.setCancelled(job, callback);
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}
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if (job.status !== 'running') {
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return callback(new Error('Job is ' + job.status + ', cancel is not allowed'));
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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._query(job, userDatabaseMetadata, 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.jobBackend.setCancelled(job, callback);
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});
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});
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});
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};
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JobCanceller.prototype.drain = function (job_id, callback) {
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var self = this;
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this.cancel(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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self.jobBackend.setPending(job, callback);
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});
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};
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JobCanceller.prototype._query = function (job, userDatabaseMetadata, callback) {
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var pg = new PSQL(userDatabaseMetadata, {}, { destroyOnError: true });
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var getPIDQuery = 'SELECT pid FROM pg_stat_activity WHERE query = \'' + job.query +
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' /* ' + job.job_id + ' */\'';
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pg.query(getPIDQuery, function(err, result) {
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if(err) {
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return callback(err);
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}
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if (!result.rows[0] || !result.rows[0].pid) {
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return callback(new Error('Query not running currently'));
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}
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var pid = result.rows[0].pid;
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var cancelQuery = 'SELECT pg_cancel_backend(' + pid + ')';
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pg.query(cancelQuery, function (err, result) {
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if (err) {
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return callback(err);
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}
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var isCancelled = result.rows[0].pg_cancel_backend;
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if (!isCancelled) {
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return callback(new Error('Query has not been cancelled'));
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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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module.exports = JobCanceller;
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