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https://github.com/gmponos/guzzle-log-middleware

A Guzzle middleware to log request and responses automatically
https://github.com/gmponos/guzzle-log-middleware

composer guzzle guzzle-middleware guzzlehttp http log logger logger-middleware middleware php php7 psr-3 rejection

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A Guzzle middleware to log request and responses automatically

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# Guzzle Log Middleware

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[![MIT licensed](https://img.shields.io/badge/license-MIT-blue.svg)](https://github.com/gmponos/monolog-slack/blob/master/LICENSE.md)

This is a middleware for [guzzle](https://github.com/guzzle/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

``` bash
$ composer require gmponos/guzzle_logger
```

## Usage

### Simple usage

```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));
$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:

```php
\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](http://docs.guzzlephp.org/en/stable/request-options.html#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
debug('Guzzle HTTP request: ' . \GuzzleHttp\Psr7\str($request));
return;
}
}
```

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

```php
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.

```php
$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.

```php
$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](CHANGELOG.md) for more information what has changed recently.

## Testing

``` bash
$ composer test
```

## Credits

- [George Mponos]([email protected])
- [Contributors](../../contributors)

## License

The MIT License (MIT). Please see [License File](LICENSE.md) for more information.