82 lines
2.3 KiB
JavaScript
82 lines
2.3 KiB
JavaScript
const PSQL = require('cartodb-psql');
|
|
const copyTo = require('pg-copy-streams').to;
|
|
const copyFrom = require('pg-copy-streams').from;
|
|
const { Client } = require('pg');
|
|
|
|
const ACTION_TO = 'to';
|
|
const ACTION_FROM = 'from';
|
|
|
|
module.exports = class StreamCopy {
|
|
constructor(sql, userDbParams) {
|
|
this.pg = new PSQL(userDbParams);
|
|
this.sql = sql;
|
|
this.connectionClosedByClient = false;
|
|
|
|
this.copyToStream = null;
|
|
this.copyFromStream = null;
|
|
}
|
|
|
|
static get ACTION_TO() {
|
|
return ACTION_TO;
|
|
}
|
|
|
|
static get ACTION_FROM() {
|
|
return ACTION_FROM;
|
|
}
|
|
|
|
to(cb) {
|
|
this.pg.connect((err, client, done) => {
|
|
if (err) {
|
|
return cb(err);
|
|
}
|
|
|
|
this.copyToStream = copyTo(this.sql);
|
|
const pgstream = client.query(this.copyToStream);
|
|
|
|
pgstream
|
|
.on('end', () => done())
|
|
.on('error', err => done(err))
|
|
.on('cancelQuery', err => {
|
|
// See https://www.postgresql.org/docs/9.5/static/protocol-flow.html#PROTOCOL-COPY
|
|
const cancelingClient = new Client(client.connectionParameters);
|
|
cancelingClient.cancel(client, pgstream);
|
|
|
|
// see https://node-postgres.com/api/pool#releasecallback
|
|
done(err);
|
|
});
|
|
|
|
cb(null, pgstream);
|
|
});
|
|
}
|
|
|
|
from(cb) {
|
|
this.pg.connect((err, client, done) => {
|
|
if (err) {
|
|
return cb(err);
|
|
}
|
|
|
|
const copyFromStream = copyFrom(this.sql);
|
|
const pgstream = client.query(copyFromStream);
|
|
|
|
pgstream
|
|
.on('end', () => done())
|
|
.on('error', err => done(err))
|
|
.on('cancelQuery', () => {
|
|
client.connection.sendCopyFail('CARTO SQL API: Connection closed by client');
|
|
});
|
|
|
|
cb(null, pgstream, copyFromStream, done);
|
|
});
|
|
}
|
|
|
|
getRowCount(action = ACTION_TO) {
|
|
if (action === ACTION_TO && this.copyToStream) {
|
|
return this.copyToStream.rowCount;
|
|
}
|
|
|
|
if (action === ACTION_FROM && this.copyFromStream) {
|
|
return this.copyFromStream.rowCount;
|
|
}
|
|
}
|
|
};
|