Default functionality / Run

[thxmike]

Based on the documentation:
"A pump reads data from its input buffer or stream and copies it to the output buffer by default:"
If I use the following example:
var datapumps = require('datapumps');
var mssql = require('mssql');
Promise = require('bluebird');

var config = {
user: 'user',
password: 'pw',
server: 'server', // You can use 'localhost\instance' to connect to named instance
database: 'db',
stream: true, // You can enable streaming globally
requestTimeout: 60000,
options: {
encrypt: false // Use this if you're on Windows Azure
}
}

var connection = new mssql.Connection(config, function (err) {

if (err) {
    console.log(err);
    return;
}

var request = connection.request();

//Only executed if not streaming i.e streaming = false
request.query('some query', function (err, recordset) {
    // ... error checks
    if (err) {
        console.log(err);
    }
});

//All Event Emitters are used when streaming i.e streaming = true
request.on('recordset', function (columns) {
    // Emitted once for each recordset in a query
});

request.on('row', function (row) {
    // Emitted for each row
    extract_input_buffer.writeAsync(row);

    console.log(extract_input_buffer.content.length);
});

request.on('error', function (err) {
    // May be emitted multiple times
});

request.on('done', function (returnValue) {
    // Always emitted as the last one
    connection.close();
    extract_input_buffer.seal();

});

});

var extract_pump = new datapumps.Pump();

var extract_input_buffer = new datapumps.Buffer({size: 100});

var extract_output_buffer = extract_pump.buffer();

extract_pump.errorBuffer().on('write', function (data) {
console.log(data);
});

extract_pump.buffer('output').on('write', function (data) {
console.log(extract_output_buffer.content.length);
});

extract_pump.buffer('output').on('end', function (data) {
console.log("output buffer has ended")
});

var transform_pump = new datapumps.Pump();

extract_pump
.from(extract_input_buffer)
.to(transform_pump, 'output')
.logErrorsToConsole()
.run()
.then(function(){

    console.log(extract_output_buffer);
});

transform_pump
.logErrorsToConsole()
.run()
.then(function () {
var from1buffer = extract_pump.from();
var output1buffer = extract_pump.buffer('output');
var from2buffer = transform_pump.from();
var output2buffer = transform_pump.buffer('output');
console.log(from1buffer.content.length);
console.log(output1buffer.content.length);
console.log(from2buffer.content.length);
console.log(output2buffer.content.length);
});

I see the extract_output_buffer written to, in line 66, however it is not being picked up in the transform_pump. Based on line 81 I set the transform_pump input buffer to the output buffer of extract_pump.

What am I am missing? Can you clarify?