106 lines
3.2 KiB
JavaScript
106 lines
3.2 KiB
JavaScript
'use strict';
|
|
|
|
const PSQL = require('cartodb-psql');
|
|
const copyTo = require('pg-copy-streams').to;
|
|
const copyFrom = require('pg-copy-streams').from;
|
|
|
|
const ACTION_TO = 'to';
|
|
const ACTION_FROM = 'from';
|
|
const DEFAULT_TIMEOUT = "'5h'";
|
|
|
|
const cancelQuery = pid => `SELECT pg_cancel_backend(${pid}) as cancelled`;
|
|
const terminateQuery = pid => `SELECT pg_terminate_backend(${pid}) as terminated`;
|
|
const timeoutQuery = timeout => `SET statement_timeout=${timeout}`;
|
|
|
|
module.exports = class StreamCopy {
|
|
constructor(sql, userDbParams, logger) {
|
|
this.dbParams = Object.assign({}, userDbParams, {
|
|
port: global.settings.db_batch_port || userDbParams.port
|
|
});
|
|
this.sql = sql;
|
|
this.stream = null;
|
|
this.timeout = global.settings.copy_timeout || DEFAULT_TIMEOUT;
|
|
this.logger = logger;
|
|
}
|
|
|
|
static get ACTION_TO() {
|
|
return ACTION_TO;
|
|
}
|
|
|
|
static get ACTION_FROM() {
|
|
return ACTION_FROM;
|
|
}
|
|
|
|
getPGStream(action, callback) {
|
|
const pg = new PSQL(this.dbParams);
|
|
|
|
pg.connect((err, client, done) => {
|
|
if (err) {
|
|
return callback(err);
|
|
}
|
|
|
|
client.query(timeoutQuery(this.timeout), (err) => {
|
|
if (err) {
|
|
return callback(err);
|
|
}
|
|
|
|
this.clientProcessID = client.processID;
|
|
|
|
this.stream = action === ACTION_TO ? copyTo(this.sql) : copyFrom(this.sql);
|
|
|
|
const pgstream = client.query(this.stream);
|
|
|
|
if (action === ACTION_TO) {
|
|
pgstream.on('end', () => done());
|
|
} else if (action === ACTION_FROM) {
|
|
pgstream.on('finish', () => done());
|
|
}
|
|
|
|
pgstream.on('error', err => {
|
|
this._cancel(client.processID, action);
|
|
done(err);
|
|
});
|
|
|
|
callback(null, pgstream);
|
|
});
|
|
});
|
|
}
|
|
|
|
getRowCount() {
|
|
return this.stream.rowCount;
|
|
}
|
|
|
|
_cancel (pid, action) {
|
|
const pg = new PSQL(this.dbParams);
|
|
const actionType = action === ACTION_TO ? ACTION_TO : ACTION_FROM;
|
|
|
|
pg.query(cancelQuery(pid), (err, result) => {
|
|
if (err) {
|
|
return this.logger.error(err);
|
|
}
|
|
|
|
const isCancelled = result.rows.length && result.rows[0].cancelled;
|
|
|
|
if (isCancelled) {
|
|
return this.logger.info(`Canceled "copy ${actionType}" stream query successfully (pid: ${pid})`);
|
|
}
|
|
|
|
return pg.query(terminateQuery(pid), (err, result) => {
|
|
if (err) {
|
|
return this.logger.error(err);
|
|
}
|
|
|
|
const isTerminated = result.rows.length && result.rows[0].terminated;
|
|
|
|
if (!isTerminated) {
|
|
return this.logger.error(
|
|
new Error(`Unable to terminate "copy ${actionType}" stream query (pid: ${pid})`)
|
|
);
|
|
}
|
|
|
|
return this.logger.info(`Terminated "copy ${actionType}" stream query successfully (pid: ${pid})`);
|
|
});
|
|
});
|
|
}
|
|
};
|