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<?php
/**
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
* http://www.gnu.org/copyleft/gpl.html
*
* @file
*/
namespace MediaWiki\Logger\Monolog;
use AvroIODatumWriter;
use AvroIOBinaryEncoder;
use AvroIOTypeException;
use AvroNamedSchemata;
use AvroSchema;
use AvroStringIO;
use AvroValidator;
use Monolog\Formatter\FormatterInterface;
/**
* Log message formatter that uses the apache Avro format.
*
* @since 1.26
* @author Erik Bernhardson <ebernhardson@wikimedia.org>
* @copyright © 2015 Erik Bernhardson and Wikimedia Foundation.
*/
class AvroFormatter implements FormatterInterface {
/**
* @var array Map from schema name to schema definition
*/
protected $schemas;
/**
* @var AvroStringIO
*/
protected $io;
/**
* @var AvroIOBinaryEncoder
*/
protected $encoder;
/**
* @var AvroIODatumWriter
*/
protected $writer;
/**
* @var array $schemas Map from Monolog channel to Avro schema.
* Each schema can be either the JSON string or decoded into PHP
* arrays.
*/
public function __construct( array $schemas ) {
$this->schemas = $schemas;
$this->io = new AvroStringIO( '' );
$this->encoder = new AvroIOBinaryEncoder( $this->io );
$this->writer = new AvroIODatumWriter();
}
/**
* Formats the record context into a binary string per the
* schema configured for the records channel.
*
* @param array $record
* @return string|null The serialized record, or null if
* the record is not valid for the selected schema.
*/
public function format( array $record ) {
$this->io->truncate();
$schema = $this->getSchema( $record['channel'] );
if ( $schema === null ) {
trigger_error( "The schema for channel '{$record['channel']}' is not available" );
return null;
}
try {
$this->writer->write_data( $schema, $record['context'], $this->encoder );
} catch ( AvroIOTypeException $e ) {
$errors = AvroValidator::getErrors( $schema, $record['context'] );
$json = json_encode( $errors );
trigger_error( "Avro failed to serialize record for {$record['channel']} : {$json}" );
return null;
}
return $this->io->string();
}
/**
* Format a set of records into a list of binary strings
* conforming to the configured schema.
*
* @param array $records
* @return string[]
*/
public function formatBatch( array $records ) {
$result = array();
foreach ( $records as $record ) {
$message = $this->format( $record );
if ( $message !== null ) {
$result[] = $message;
}
}
return $result;
}
/**
* Get the writer for the named channel
*
* @var string $channel Name of the schema to fetch
* @return AvroSchema|null
*/
protected function getSchema( $channel ) {
if ( !isset( $this->schemas[$channel] ) ) {
return null;
}
if ( !$this->schemas[$channel] instanceof AvroSchema ) {
if ( is_string( $this->schemas[$channel] ) ) {
$this->schemas[$channel] = AvroSchema::parse( $this->schemas[$channel] );
} else {
$this->schemas[$channel] = AvroSchema::real_parse(
$this->schemas[$channel],
null,
new AvroNamedSchemata()
);
}
}
return $this->schemas[$channel];
}
}
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