pg-pipe

pg-pipe

Given two connected pg-native clients, use a very efficient row by row copy with libpq to move data between them.

install

$ npm install pg-pipe

use

I'm using sync calls of connect and query below to make the example more readable, but the actual piping is completely non-blocking. You can use completely non-blocking queries and connection as well, I just think the example is more readable with less callbacks in it.

var pipe = require('pg-pipe');
var Client = require('pg-native');
var from = new Client();
var to = new Client();

from.connectSync();
to.connectSync();

//prepare the source client to start
//sending rows over the copy protocol
from.querySync('COPY some_table TO stdout');

//prepare the destination client to start
//recieving rows over the copy protocol
to.querySync('COPY some_table FROM stdin');

//now use libpq's built-in efficient row-by-row copy mode
//to move data at the speed of magic!
pipe(from, to, function(err) {
  //callback will be called once the operation is done
});

API

pipe(from:Client, to:Client, callback:function(err:error))

Pipes data from one client to another. Both clients need to be connected and already in their respective COPY modes which are started by issuing the corresponding COPY FROM / COPY TO queries.

license

The MIT License (MIT)

Copyright (c) 2014 Brian M. Carlson

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.