Magento 2.2 Customer Session – Fix Session Not Working with Cache Enabled

If you want to use SQL approach, You can use the following standalone script which can be run either via Web or CLI

<?php
/**
 *
 * @author Raj KB<magepsycho@gmail.com>
 * @website http://www.magepsycho.com
 * @extension MassImporterPro: Pricing - http://www.magepsycho.com/mass-importer-pro-price-importer-regular-special-tier-group.html
 */
ini_set('display_errors', 1);
ini_set('display_startup_errors', 1);
error_reporting(E_ALL);

// Capture warning / notice as exception
set_error_handler('ctv_exceptions_error_handler');
function ctv_exceptions_error_handler($severity, $message, $filename, $lineno) {
    if (error_reporting() == 0) {
        return;
    }
    if (error_reporting() & $severity) {
        throw new ErrorException($message, 0, $severity, $filename, $lineno);
    }
}

require __DIR__ . '/../app/bootstrap.php';
$bootstrap = \Magento\Framework\App\Bootstrap::create(BP, $_SERVER);

$obj = $bootstrap->getObjectManager();

$state = $obj->get('Magento\Framework\App\State');
$state->setAreaCode('adminhtml');


/**************************************************************************************************/
// UTILITY FUNCTIONS - START
/**************************************************************************************************/
function _mpLog($data, $includeSep = false)
{
    $fileName = BP . '/var/log/m2-magepsycho-import-prices.log';
    if ($includeSep) {
        $separator = str_repeat('=', 70);
        file_put_contents($fileName, $separator . '<br />' . PHP_EOL,  FILE_APPEND | LOCK_EX);
    }
    file_put_contents($fileName, $data . '<br />' .PHP_EOL,  FILE_APPEND | LOCK_EX);
}

function mpLogAndPrint($message, $separator = false)
{
    _mpLog($message, $separator);
    if (is_array($message) || is_object($message)) {
        print_r($message);
    } else {
        echo $message . '<br />' . PHP_EOL;
    }

    if ($separator) {
        echo str_repeat('=', 70) . '<br />' . PHP_EOL;
    }
}

function getIndex($field)
{
    global $headers;
    $index = array_search($field, $headers);
    if ( !strlen($index)) {
        $index = -1;
    }
    return $index;
}

function readCsvRows($csvFile)
{
    $rows = [];
    $fileHandle = fopen($csvFile, 'r');
    while(($row = fgetcsv($fileHandle, 0, ',', '"', '"')) !== false) {
        $rows[] = $row;
    }
    fclose($fileHandle);
    return $rows;
}

function _getResourceConnection()
{
    global $obj;
    return $obj->get('Magento\Framework\App\ResourceConnection');
}

function _getReadConnection()
{
    return _getConnection('core_read');
}

function _getWriteConnection()
{
    return _getConnection('core_write');
}

function _getConnection($type = 'core_read')
{
    return _getResourceConnection()->getConnection($type);
}

function _getTableName($tableName)
{
    return _getResourceConnection()->getTableName($tableName);
}

function _getAttributeId($attributeCode)
{
    $connection = _getReadConnection();
    $sql = "SELECT attribute_id FROM " . _getTableName('eav_attribute') . " WHERE entity_type_id = ? AND attribute_code = ?";
    return $connection->fetchOne(
        $sql,
        [
            _getEntityTypeId('catalog_product'),
            $attributeCode
        ]
    );
}

function _getEntityTypeId($entityTypeCode)
{
    $connection = _getConnection('core_read');
    $sql        = "SELECT entity_type_id FROM " . _getTableName('eav_entity_type') . " WHERE entity_type_code = ?";
    return $connection->fetchOne(
        $sql,
        [
            $entityTypeCode
        ]
    );
}

function _getIdFromSku($sku)
{
    $connection = _getConnection('core_read');
    $sql        = "SELECT entity_id FROM " . _getTableName('catalog_product_entity') . " WHERE sku = ?";
    return $connection->fetchOne(
        $sql,
        [
            $sku
        ]
    );

}

function checkIfSkuExists($sku)
{
    $connection = _getConnection('core_read');
    $sql        = "SELECT COUNT(*) AS count_no FROM " . _getTableName('catalog_product_entity') . " WHERE sku = ?";
    return $connection->fetchOne($sql, [$sku]);
}

function updatePrices($sku, $price, $storeId = 0)
{
    $connection     = _getWriteConnection();
    $entityId       = _getIdFromSku($sku);
    $attributeId    = _getAttributeId('price');

    $sql = "INSERT INTO " . _getTableName('catalog_product_entity_decimal') . " (attribute_id, store_id, entity_id, value) VALUES (?, ?, ?, ?) ON DUPLICATE KEY UPDATE value=VALUES(value)";
    $connection->query(
        $sql,
        [
            $attributeId,
            $storeId,
            $entityId,
            $price
        ]
    );
}

/**************************************************************************************************/
// UTILITY FUNCTIONS - END
/**************************************************************************************************/

try {
    $csvFile        = 'var/import/prices.csv'; #EDIT - The path to import CSV file (Relative to Magento2 Root)
    $csvData        = readCsvRows(BP . '/' . $csvFile);
    $headers        = array_shift($csvData);

    $count   = 0;
    foreach($csvData as $_data) {
        $count++;
        $sku   = $_data[getIndex('sku')];
        $price = $_data[getIndex('price')];

        if ( ! checkIfSkuExists($sku)) {
            $message =  $count .'. FAILURE:: Product with SKU (' . $sku . ') doesn\'t exist.';
            mpLogAndPrint($message);
            continue;
        }

        try {
            updatePrices($sku, $price);
            $message = $count . '. SUCCESS:: Updated SKU (' . $sku . ') with price (' . $price . ')';
            mpLogAndPrint($message);
        } catch(Exception $e) {
            $message =  $count . '. ERROR:: While updating  SKU (' . $sku . ') with Price (' . $price . ') => ' . $e->getMessage();
            mpLogAndPrint($message);
        }
    }
} catch (Exception $e) {
    mpLogAndPrint(
        'EXCEPTION::' . $e->getTraceAsString()
    );
}

And the sample CSV can be used as:

"sku","price"
"24-MB01","31"
"24-MX02","32"
"24-UG04","94"
"24-UG05","99"

Source: http://bit.ly/M2-Bulk-Price-Update

To have access to real data in Magento 2 session you have to apply one of the following

• Do it on non-cacheable page.
• Disable full page cache.
• Set $this->$_isScopePrivate = true for block where you are trying to access session.

Why:

Magento 2 is rendering public and private content for cacheable pages separately.

During cacheable page rendering Magento is cleaning all data that can be specific to a particular user (unsetting private data). Then separate ajax request is performed to load all private information and update blocks.

That's why session is empty during rendering.

The responsibility of cleaning private data lies on several depersonalization plugins. Customer session for example is cleaned by \Magento\Customer\Model\Layout\DepersonalizePlugin.

You can see conditions in which depersonalization will apply in \Magento\PageCache\Model\DepersonalizeChecker::checkIfDepersonalize

What are cacheable/non-cacheable pages:

In short words, cacheable page is any page that does not include non-cacheable blocks (blocks with cacheable="false" attribute in layout declaration). Correspondingly, pages with non-cacheable blocks are non-cacheable. :)

Here you can find the actual check: \Magento\Framework\View\Layout::isCacheable

Cacheable page examples: Category, Product view pages, CMS pages

Non-cacheable page examples: Customer account and checkotu pages

There is a more detailed Magento 2 Caching Overview by Alan Kent