includes/log-handlers/class-wc-log-handler-email.php
<?php
/**
* Class WC_Log_Handler_Email file.
*
* @package WooCommerce\Log Handlers
*/
if ( ! defined( 'ABSPATH' ) ) {
exit; // Exit if accessed directly.
}
/**
* Handles log entries by sending an email.
*
* WARNING!
* This log handler has known limitations.
*
* Log messages are aggregated and sent once per request (if necessary). If the site experiences a
* problem, the log email may never be sent. This handler should be used with another handler which
* stores logs in order to prevent loss.
*
* It is not recommended to use this handler on a high traffic site. There will be a maximum of 1
* email sent per request per handler, but that could still be a dangerous amount of emails under
* heavy traffic. Do not confuse this handler with an appropriate monitoring solution!
*
* If you understand these limitations, feel free to use this handler or borrow parts of the design
* to implement your own!
*
* @class WC_Log_Handler_Email
* @version 1.0.0
* @package WooCommerce\Classes\Log_Handlers
*/
class WC_Log_Handler_Email extends WC_Log_Handler {
/**
* Minimum log level this handler will process.
*
* @var int Integer representation of minimum log level to handle.
*/
protected $threshold;
/**
* Stores email recipients.
*
* @var array
*/
protected $recipients = array();
/**
* Stores log messages.
*
* @var array
*/
protected $logs = array();
/**
* Stores integer representation of maximum logged level.
*
* @var int
*/
protected $max_severity = null;
/**
* Constructor for log handler.
*
* @param string|array $recipients Optional. Email(s) to receive log messages. Defaults to site admin email.
* @param string $threshold Optional. Minimum level that should receive log messages.
* Default 'alert'. One of: emergency|alert|critical|error|warning|notice|info|debug.
*/
public function __construct( $recipients = null, $threshold = 'alert' ) {
if ( null === $recipients ) {
$recipients = get_option( 'admin_email' );
}
if ( is_array( $recipients ) ) {
foreach ( $recipients as $recipient ) {
$this->add_email( $recipient );
}
} else {
$this->add_email( $recipients );
}
$this->set_threshold( $threshold );
add_action( 'shutdown', array( $this, 'send_log_email' ) );
}
/**
* Set handler severity threshold.
*
* @param string $level emergency|alert|critical|error|warning|notice|info|debug.
*/
public function set_threshold( $level ) {
$this->threshold = WC_Log_Levels::get_level_severity( $level );
}
/**
* Determine whether handler should handle log.
*
* @param string $level emergency|alert|critical|error|warning|notice|info|debug.
* @return bool True if the log should be handled.
*/
protected function should_handle( $level ) {
return $this->threshold <= WC_Log_Levels::get_level_severity( $level );
}
/**
* Handle a log entry.
*
* @param int $timestamp Log timestamp.
* @param string $level emergency|alert|critical|error|warning|notice|info|debug.
* @param string $message Log message.
* @param array $context Optional. Additional information for log handlers.
*
* @return bool False if value was not handled and true if value was handled.
*/
public function handle( $timestamp, $level, $message, $context ) {
if ( $this->should_handle( $level ) ) {
$this->add_log( $timestamp, $level, $message, $context );
return true;
}
return false;
}
/**
* Send log email.
*
* @return bool True if email is successfully sent otherwise false.
*/
public function send_log_email() {
$result = false;
if ( ! empty( $this->logs ) ) {
$subject = $this->get_subject();
$body = $this->get_body();
$result = wp_mail( $this->recipients, $subject, $body );
$this->clear_logs();
}
return $result;
}
/**
* Build subject for log email.
*
* @return string subject
*/
protected function get_subject() {
$site_name = get_bloginfo( 'name' );
$max_level = strtoupper( WC_Log_Levels::get_severity_level( $this->max_severity ) );
$log_count = count( $this->logs );
return sprintf(
/* translators: 1: Site name 2: Maximum level 3: Log count */
_n(
'[%1$s] %2$s: %3$s WooCommerce log message',
'[%1$s] %2$s: %3$s WooCommerce log messages',
$log_count,
'woocommerce'
),
$site_name,
$max_level,
$log_count
);
}
/**
* Build body for log email.
*
* @return string body
*/
protected function get_body() {
$site_name = get_bloginfo( 'name' );
$entries = implode( PHP_EOL, $this->logs );
$log_count = count( $this->logs );
return _n(
'You have received the following WooCommerce log message:',
'You have received the following WooCommerce log messages:',
$log_count,
'woocommerce'
) . PHP_EOL
. PHP_EOL
. $entries
. PHP_EOL
. PHP_EOL
/* translators: %s: Site name */
. sprintf( __( 'Visit %s admin area:', 'woocommerce' ), $site_name )
. PHP_EOL
. admin_url();
}
/**
* Adds an email to the list of recipients.
*
* @param string $email Email address to add.
*/
public function add_email( $email ) {
array_push( $this->recipients, $email );
}
/**
* Add log message.
*
* @param int $timestamp Log timestamp.
* @param string $level emergency|alert|critical|error|warning|notice|info|debug.
* @param string $message Log message.
* @param array $context Additional information for log handlers.
*/
protected function add_log( $timestamp, $level, $message, $context ) {
$this->logs[] = $this->format_entry( $timestamp, $level, $message, $context );
$log_severity = WC_Log_Levels::get_level_severity( $level );
if ( $this->max_severity < $log_severity ) {
$this->max_severity = $log_severity;
}
}
/**
* Clear log messages.
*/
protected function clear_logs() {
$this->logs = array();
}
}