Guzzle Log Middleware

This is a middleware for guzzle that will help you automatically log every request and response using a PSR-3 logger.

The middleware is functional with version 6 of Guzzle.

Install

Via Composer

$ composer require gmponos/guzzle_logger

Usage

Simple usage

use GuzzleLogMiddleware\LogMiddleware;
use GuzzleHttp\HandlerStack;

$logger = new Logger();  //A new PSR-3 Logger like Monolog
$stack = HandlerStack::create(); // will create a stack stack with middlewares of guzzle already pushed inside of it.
$stack->push(new LogMiddleware($logger));
$client = new GuzzleHttp\Client([
    'handler' => $stack,
]);

From now on each request and response you execute using $client object will be logged. By default the middleware logs every activity with level DEBUG.

Advanced initialization

The signature of the LogMiddleware class is the following:

\GuzzleLogMiddleware\LogMiddleware(
    \Psr\Log\LoggerInterface $logger, 
    \GuzzleLogMiddleware\Handler\HandlerInterface $handler = null, 
    bool $onFailureOnly = false, 
    bool $logStatistics = false
);

• logger - The PSR-3 logger to use for logging.
• handler - A HandlerInterface class that will be responsible for logging your request/response. Check Handlers sections.
• onFailureOnly - By default the middleware is set to log every request and response. If you wish to log the HTTP messages only when guzzle returns a rejection set this as true or when an exception occurred. Guzzle returns a rejection when http_errors option is set to true.
• logStatistics - If you set this option as true then the middleware will also log statistics about the HTTP transaction.

Handlers

In order to make the middleware more flexible we allow the developer to initialize it with a handler. A handler is the class that will be responsible for logging the HTTP message and it must implement a HandlerInterface.

As an example let's say that we create the following handler:

<?php
namespace GuzzleLogMiddleware\Handler;

use Psr\Http\Message\ResponseInterface;
use Psr\Http\Message\RequestInterface;
use GuzzleHttp\TransferStats;
use Psr\Log\LoggerInterface;

/** A simple handler that logs only requests */
final class SimpleHandler implements HandlerInterface
{
    public function log(
        LoggerInterface $logger,
        RequestInterface $request,
        ?ResponseInterface $response = null,
        ?\Throwable $exception = null,
        ?TransferStats $stats = null,
        array $options = []
    ): void {
        $logger->debug('Guzzle HTTP request: ' . \GuzzleHttp\Psr7\str($request));
        return;
    }
}

We can pass the handler above during construction of the middleware.

<?php
use GuzzleLogMiddleware\LogMiddleware;
use GuzzleHttp\HandlerStack;

$logger = new Logger();  //A new PSR-3 Logger like Monolog
$stack = HandlerStack::create(); // will create a stack stack with middlewares of guzzle already pushed inside of it.
$stack->push(new LogMiddleware($logger, new SimpleHandler()));
$client = new GuzzleHttp\Client([
    'handler' => $stack,
]);

From now on all Requests will be logged. Note that at the example above only requests are logged.

Important

If no handler is passed the middleware will initialize it's own handler. At the moment the default one is MultiRecordArrayHandler

MultiRecordArrayHandler

This is the default handler used from the middleware. This handler uses internally the FixedStrategy and logs all request and responses with level debug. This handler adds a separate log entry for each Request, Response, Exception or TransferStats. The information about each object are added as a context array to the log entry.

StringHandler

This handler uses internally the FixedStrategy and logs all request and responses with level debug. You can initialize this handler with a custom strategy. This handler adds a separate log entry for each Request, Response, Exception or TransferStats. The handler converts the objects to strings and the information about each object are added to the message of the log entry.

Log Level Strategies

Strategies are used to define the LogLevel that the handler will use to log each object.

FixedStrategy

You can use this strategy to log each HTTP Message with a specific level.

StatusCodeStrategy

You can use this strategy to log each HTTP Response with a specific level depending on the status code of the Response.

$strategy = new StatusCodeStrategy(
    LogLevel::INFO, // Default level used for requests or for responses that status code are not set with a different level.
    LogLevel::CRITICAL // Default level used for exceptions.
);
$strategy->setLevel(404, LogLevel::WARNING);
$multiRecordArrayHandler = new MultiRecordArrayHandler($strategy);

$logger = new Logger();  //A new PSR-3 Logger like Monolog
$stack = HandlerStack::create(); // will create a stack stack with middlewares of guzzle already pushed inside of it.
$stack->push(new LogMiddleware($logger, $multiRecordArrayHandler));
$client = new GuzzleHttp\Client([
    'handler' => $stack,
]);

Using options on each request

You can set on each request options about your log.

$client->get('/', [
    'log' => [
        'on_exception_only' => true,
        'statistics' => true,
    ]
]);

• on_exception_only Do not log anything unless if the response status code is above the threshold.
• statistics if the on_exception_only option/variable is true and this is also true the middleware will log statistics about the HTTP call.

Change log

Please see CHANGELOG for more information what has changed recently.

Testing

$ composer test

Credits

• George Mponos
• Contributors

License

The MIT License (MIT). Please see License File for more information.