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throwable-handler

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Throwable handler for multiple contexts

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# ThrowableHandler

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## Summary

The ThrowableHandler package provides handling for [throwable](https://www.php.net/throwable) with rich formatting support for console, HTML and plain text documents. Its purpose is to ease the understanding of [Exceptions](https://www.php.net/manual/en/language.exceptions.php) on production systems by providing a consistent and user-friendly output.

Read [Throwable Handler for PHP](https://rodolfoberrios.com/2022/05/03/throwable-handler/) at Rodolfo's blog for a comprehensive introduction to this package.

## Installing

ThrowableHandler is available through [Packagist](https://packagist.org/packages/chevere/throwable-handler) and the repository source is at [chevere/throwable-handle](https://github.com/chevere/throwable-handler).

```sh
composer require chevere/throwable-handler
```

## Quick start

For quick catch-all use, first register ThrowableHandler to handle all errors.

```php
use Chevere\ThrowableHandler\ThrowableHandler;

set_error_handler(ThrowableHandler::ERROR_AS_EXCEPTION);
register_shutdown_function(ThrowableHandler::SHUTDOWN_ERROR_AS_EXCEPTION);
```

Then register your exception handler, you can choose:

* `ThrowableHandler::PLAIN`
* `ThrowableHandler::CONSOLE`
* `ThrowableHandler::HTML`

```php
use Chevere\ThrowableHandler\ThrowableHandler;

set_exception_handler(ThrowableHandler::PLAIN);
```

Keep reading the documentation for more advanced usage and configuration options.

## Demo

![HTML demo](https://raw.githubusercontent.com/chevere/throwable-handler/1.0/demo/demo.svg)

* [HTML](https://chevere.github.io/throwable-handler/demo/output/html.html)
* [HTML (silent)](https://chevere.github.io/throwable-handler/demo/output/html-silent.html)
* [Plain text](https://chevere.github.io/throwable-handler/demo/output/plain.txt)
* [Console (asciinema)](https://asciinema.org/a/491732)

## Features

* Multiple use modes (auto, triggered, manual)
* Supports nested throwables (previous: `$e`)
* Console document
  * Colorful console output (where available)
* Plain document
  * Same as console (no-color)
  * Same as copy HTML text
* HTML document
  * Responsive design (narrow devices)
  * Silent mode for end-user

## Errors as exceptions

Use the following helpers to forward errors as exceptions, which will be then handled by ThrowableHandler.

### errorAsException

Use function `ThrowableHandler::ERROR_AS_EXCEPTION` to handle errors as exceptions. By doing this the system will throw exception instead of emitting errors.

```php
use Chevere\ThrowableHandler\ThrowableHandler;

set_error_handler(ThrowableHandler::ERROR_AS_EXCEPTION);
```

### shutdownErrorAsException

Use function `ThrowableHandler::SHUTDOWN_ERROR_AS_EXCEPTION` to register errors on shutdown. This will take care or register errors in shutdown by forwarding the error to the exception handler.

```php
use Chevere\ThrowableHandler\ThrowableHandler;

register_shutdown_function(ThrowableHandler::SHUTDOWN_ERROR_AS_EXCEPTION);
```

## Automatic handling

Use the following helpers to quick handle throwables by registering global handlers.

### Plain handler

Use `ThrowableHandler::PLAIN` to set plain handler for all exceptions.

```php
use Chevere\ThrowableHandler\ThrowableHandler;

set_exception_handler(ThrowableHandler::PLAIN);
```

### Console handler

Use `ThrowableHandler::CONSOLE` to set console handler for all exceptions.

```php
use Chevere\ThrowableHandler\ThrowableHandler;

set_exception_handler(ThrowableHandler::CONSOLE);
```

### HTML handler

Use `ThrowableHandler::HTML` to set console handler for all exceptions.

```php
use Chevere\ThrowableHandler\ThrowableHandler;

set_exception_handler(ThrowableHandler::HTML);
```

## Triggered handling

Use the following helpers to quick handle catches for throwables.

### handleAsPlain

Use function `handleAsPlain` to handle throwable as plain text.

```php
use function Chevere\ThrowableHandler\handleAsPlain;

try {
    // ...
} catch(Throwable $e) {
    handleAsPlain($e);
}
```

### handleAsConsole

Use function `handleAsConsole` to handle throwable as console text.

```php
use function Chevere\ThrowableHandler\handleAsConsole;

try {
    // ...
} catch(Throwable $e) {
    handleAsConsole($e);
}
```

### htmlHandler

Use function `htmlHandler` to handle throwable as HTML.

```php
use function Chevere\ThrowableHandler\htmlHandler;

try {
    // ...
} catch(Throwable $e) {
    htmlHandler($e);
}
```

## Manual handling

### Documents

Generate context documents with information about the throwable.

#### Plain document

Use `plainDocument` to create a plain text document.

```php
use function Chevere\ThrowableHandler\plainDocument;

$document = plainDocument($e);
$plain = $document->__toString();
```

Use `Documents\PlainDocument` to create a plain text document by passing its handler.

```php
use Chevere\ThrowableHandler\Documents\PlainDocument;

$handler = throwableHandler($throwable);
$document = new PlainDocument($handler);
```

#### Console document

Use `consoleDocument` to create a console document.

```php
use function Chevere\ThrowableHandler\consoleDocument;

$document = consoleDocument($e);
$console = $document->__toString();
```

Use `Documents\ConsoleDocument` to create a console document by passing its handler.

```php
use Chevere\ThrowableHandler\Documents\ConsoleDocument;

$handler = throwableHandler($e);
$document = new ConsoleDocument($handler);
```

#### HTML document

Use `htmlDocument` to create an HTML document.

```php
use function Chevere\ThrowableHandler\htmlDocument;

$document = htmlDocument($throwable);
$html = $document->__toString();
```

Use `Documents\HtmlDocument` to create a console document by passing its handler.

```php
use Chevere\ThrowableHandler\Documents\HtmlDocument;

$handler = throwableHandler($throwable);
$document = new HtmlDocument($handler);
```

### Multiple documents

Multiple documents can be created **from the same** handler event:

```php
use Chevere\ThrowableHandler\Documents\ConsoleDocument;
use Chevere\ThrowableHandler\Documents\HtmlDocument;
use Chevere\ThrowableHandler\Documents\PlainDocument;
use function Chevere\ThrowableHandler\throwableHandler;

$handler = throwableHandler($e);
$consoleDoc = new ConsoleDocument($handler);
$plainDoc = new PlainDocument($handler);
$htmlDoc = new HtmlDocument($handler);
```
### Debug

The method `withIsDebug` in `ThrowableHandlerInterface` can be used to toggle debug information on generated documents.

```php
use Chevere\ThrowableHandler\Documents\HtmlDocument;
use function Chevere\ThrowableHandler\throwableHandler;

$handler = throwableHandler($e);
$docLoud = new HtmlDocument($handler);
$docSilent = new HtmlDocument(
    $handler->withIsDebug(false)
);
```

## Custom title and message

When handling silent HTML documents, the default title is `Something went wrong` and the default message is `Please try again later. If the problem persists don't hesitate to contact the system administrator.`. These defaults are used when debug information is disabled and no custom title or message is set.

The methods `withTitle` and `withMessage` in `ThrowableHandlerInterface` can be used to set custom title and message on generated documents.

```php
use Chevere\ThrowableHandler\Documents\HtmlDocument;
use function Chevere\ThrowableHandler\throwableHandler;

$handler = throwableHandler($e)
    ->withIsDebug(false)
    ->withTitle('Algo se fue a la chucha')
    ->withMessage(
        <<<PLAIN
        ¡La vendimos! Ya estamos trabajando para resolver este problema.
        PLAIN
    );
$docSilent = new HtmlDocument($handler);
```

For the code above, `$docLoud` contains debug information (throwable info, file, line, trace and server) while `$docSilent` provides a generic message but referencing to the throwable handled id.

## Documentation

Documentation is available at [chevere.org](https://chevere.org/packages/throwable-handler).

## License

Copyright [Rodolfo Berrios A.](https://rodolfoberrios.com/)

Chevere is licensed under the Apache License, Version 2.0. See [LICENSE](LICENSE) for the full license text.

Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License.

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