woocommerce/includes/export/abstract-wc-csv-batch-expor...

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<?php
/**
* Handles Batch CSV export.
*
* Based on https://pippinsplugins.com/batch-processing-for-big-data/
*
* @author Automattic
* @category Admin
* @package WooCommerce/Export
* @version 3.1.0
*/
if ( ! defined( 'ABSPATH' ) ) {
exit;
}
/**
* Include dependencies.
*/
if ( ! class_exists( 'WC_CSV_Exporter', false ) ) {
include_once( WC_ABSPATH . 'includes/export/abstract-wc-csv-exporter.php' );
}
/**
* WC_CSV_Exporter Class.
*/
abstract class WC_CSV_Batch_Exporter extends WC_CSV_Exporter {
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/**
* The file being exported to.
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*
* @var string
*/
protected $file;
/**
* Page being exported
*
* @var integer
*/
protected $page = 1;
/**
* Constructor.
*/
public function __construct() {
$upload_dir = wp_upload_dir();
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$this->file = trailingslashit( $upload_dir['basedir'] ) . $this->get_filename();
$this->column_names = $this->get_default_column_names();
}
/**
* Get the file contents.
*
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* @since 3.1.0
* @return string
*/
public function get_file() {
$file = '';
if ( @file_exists( $this->file ) ) {
$file = @file_get_contents( $this->file );
} else {
@file_put_contents( $this->file, '' );
@chmod( $this->file, 0664 );
}
return $file;
}
/**
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* Serve the file and remove once sent to the client.
*
* @since 3.1.0
*/
public function export() {
$this->send_headers();
$this->send_content( $this->get_file() );
@unlink( $this->file );
die();
}
/**
* Generate the CSV file.
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*
* @since 3.1.0
*/
public function generate_file() {
if ( 1 === $this->get_page() ) {
@unlink( $this->file );
}
$this->prepare_data_to_export();
$this->write_csv_data( $this->get_csv_data() );
}
/**
* Write data to the file.
*
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* @since 3.1.0
* @param string $data
*/
protected function write_csv_data( $data ) {
$file = $this->get_file();
// Add columns when finished.
if ( 100 === $this->get_percent_complete() ) {
$file = $this->export_column_headers() . $file;
}
$file .= $data;
@file_put_contents( $this->file, $file );
}
/**
* Get page.
*
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* @since 3.1.0
* @return int
*/
public function get_page() {
return $this->page;
}
/**
* Set page.
*
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* @since 3.1.0
* @param int $page
*/
public function set_page( $page ) {
$this->page = absint( $page );
}
/**
* Get count of records exported.
*
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* @since 3.1.0
* @return int
*/
public function get_total_exported() {
return ( $this->get_page() * $this->get_limit() ) + $this->exported_row_count;
}
/**
* Get total % complete.
*
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* @since 3.1.0
* @return int
*/
public function get_percent_complete() {
return $this->total_rows ? floor( ( $this->get_total_exported() / $this->total_rows ) * 100 ) : 100;
}
}