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Merge pull request #8241 from creative-commoners/pulls/4.3/separate-logging

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Separate core error logging from standard LoggerInterface
This commit is contained in:
Guy Marriott 2019-04-05 08:49:09 +13:00 committed by GitHub
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9 changed files with 214 additions and 45 deletions
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19
_config/logging.yml
View File

@ -1,21 +1,34 @@
---
Name: logging
---
# Logging is built up of a chain containing:
# Core error logging is built up of a chain containing:
# - A top level \ErrorHandler which registers the error service
# - A \Logger which acts as the error service
# - A \HandlerInterface which handles errors for the logger
# - One or more \FormatterInterface which format errors for the handler
#
# Logging for use outside of core error handling also uses the same implementations,
# but is available without the HandlerInterfaces attached
SilverStripe\Core\Injector\Injector:
SilverStripe\Logging\ErrorHandler:
class: SilverStripe\Logging\MonologErrorHandler
properties:
Logger: '%$Psr\Log\LoggerInterface'
calls:
pushDefaultLogger: [ pushLogger, [ '%$Psr\Log\LoggerInterface' ] ]
pushErrorHandler: [ pushLogger, [ '%$Psr\Log\LoggerInterface.errorhandler' ] ]
# Default implementation for use as a standard logger. Up to developers to attach their own
# handlers
Psr\Log\LoggerInterface:
type: singleton
class: Monolog\Logger
constructor:
- "error-log"
# Core error handling
Psr\Log\LoggerInterface.errorhandler:
type: singleton
class: Monolog\Logger
constructor:
- "error-handler"
calls:
pushDisplayErrorHandler: [ pushHandler, [ '%$Monolog\Handler\HandlerInterface' ] ]
---

1
_config/tests.yml
View File

@ -11,6 +11,7 @@ SilverStripe\Core\Injector\Injector:
fixtures: '%$SilverStripe\Dev\State\FixtureTestState'
requirements: '%$SilverStripe\View\Dev\RequirementsTestState'
ssviewer: '%$SilverStripe\View\Dev\SSViewerTestState'
logstate: '%$SilverStripe\Dev\State\LoggerState'
---
Name: kerneltest
Before: '*'

88
docs/en/02_Developer_Guides/07_Debugging/01_Error_Handling.md
View File

@ -4,13 +4,14 @@ summary: Trap, fire and report diagnostic logs, user exceptions, warnings and er
# Logging and Error Handling
SilverStripe uses Monolog for both error handling and logging. It comes with two default configurations: one for
development environments, and another for test or live environments. On development environments, SilverStripe will
deal harshly with any warnings or errors: a full call-stack is shown and execution stops for anything, giving you early
warning of a potential issue to handle.
logging, and another for core error handling. The core error handling implementation also comes with two default
configurations: one for development environments, and another for test or live environments. On development
environments, SilverStripe will deal harshly with any warnings or errors: a full call-stack is shown and execution
stops for anything, giving you early warning of a potential issue to handle.
## Raising errors and logging diagnostic information.
For informational and debug logs, you can use the Logger directly. The Logger is a PSR-3 compatible LoggerInterface and
For general purpose logging, you can use the Logger directly. The Logger is a PSR-3 compatible LoggerInterface and
can be accessed via the `Injector`:
```php
@ -20,13 +21,15 @@ use SilverStripe\Security\Security;
Injector::inst()->get(LoggerInterface::class)->info('User has logged in: ID #' . Security::getCurrentUser()->ID);
Injector::inst()->get(LoggerInterface::class)->debug('Query executed: ' . $sql);
Injector::inst()->get(LoggerInterface::class)->error('Something went wrong, but let\'s continue on...');
```
Although you can raise more important levels of alerts in this way, we recommend using PHP's native error systems for
these instead.
For notice-level and warning-level issues, you should use [user_error](http://www.php.net/user_error) to throw errors
where appropriate. These will not halt execution but will send a message to the PHP error log.
For notice-level and warning-level issues, you can also use [user_error](http://www.php.net/user_error) to throw errors
where appropriate. As with the default Logger implementation these will not halt execution, but will send a message
to the PHP error log.
```php
public function delete()
@ -48,37 +51,52 @@ public function getRelatedObject()
}
```
For errors that should halt execution, you should use Exceptions. Normally, Exceptions will halt the flow of executuion,
For errors that should halt execution, you should use Exceptions. Normally, Exceptions will halt the flow of execution,
but they can be caught with a try/catch clause.
```php
throw new \LogicException("Query failed: " . $sql);
```
### Accessing the logger via dependency injection.
### Accessing the logger via dependency injection
It can be quite verbose to call `Injector::inst()->get(LoggerInterface::class)` all the time. More importantly,
it also means that you're coupling your code to global state, which is a bad design practise. A better
approach is to use depedency injection to pass the logger in for you. The [Injector](../extending/Injector)
approach is to use dependency injection to pass the logger in for you. The [Injector](../extending/Injector)
can help with this. The most straightforward is to specify a `dependencies` config setting, like this:
```php
use Psr\Log\LoggerInterface;
use SilverStripe\Control\Controller;
class MyController extends Controller
{
private static $dependencies = [
'logger' => '%$Psr\Log\LoggerInterface',
'Logger' => '%$' . LoggerInterface::class,
];
// This will be set automatically, as long as MyController is instantiated via Injector
public $logger;
/**
* This will be set automatically, as long as MyController is instantiated via Injector
*
* @var LoggerInterface
*/
protected $logger;
protected function init()
{
$this->logger->debug("MyController::init() called");
parent::init();
}
/**
* @param LoggerInterface $logger
* @return $this
*/
public function setLogger(LoggerInterface $logger)
{
$this->logger = $logger;
return $this;
}
}
```
@ -98,7 +116,7 @@ E_USER_ERROR if it's going to be **dangerous** or **impossible** to continue wit
## Configuring error logging
You can configure your logging using Monolog handlers. The handlers should be provided int the `Logger.handlers`
You can configure your logging using Monolog handlers. The handlers should be provided in the `Logger.handlers`
configuration setting. Below we have a couple of common examples, but Monolog comes with [many different handlers](https://github.com/Seldaek/monolog/blob/master/doc/02-handlers-formatters-processors.md#handlers)
for you to try.
@ -145,24 +163,27 @@ SilverStripe\Core\Injector\Injector:
- "info"
```
The log file will be relative to the framework/ path, so "../silverstripe.log" will create a file in your project root.
The log file will be relative to the main index.php file path (default: inside public/), so "../silverstripe.log" will
create a file in your project root.
The `info` argument provides the minimum level to start logging at.
### Disabling the default handler
You can disable a handler by removing its pushHandlers call from the calls option of the Logger service definition.
The handler key of the default handler is `DisplayErrorHandler`, so you can disable it like this:
The handler key of the default handler is `pushDisplayErrorHandler`, so you can disable it like this:
```yaml
SilverStripe\Core\Injector\Injector:
Psr\Log\LoggerInterface:
Psr\Log\LoggerInterface.errorhandler:
calls:
DisplayErrorHandler: %%remove%%
pushDisplayErrorHandler: %%remove%%
```
### Setting a different configuration for dev
In order to set different logging configuration on different environment types, we rely on the environment-specific
configuration features that the config system proviers. For example, here we have different configuration for dev and
configuration features that the config system providers. For example, here we have different configuration for dev and
non-dev.
```yaml
@ -172,7 +193,7 @@ Only:
environment: dev
---
SilverStripe\Core\Injector\Injector:
Psr\Log\LoggerInterface:
Psr\Log\LoggerInterface.errorhandler:
calls:
pushDisplayErrorHandler: [ pushHandler, [ %$DisplayErrorHandler ]]
DisplayErrorHandler:
@ -188,10 +209,21 @@ Except:
environment: dev
---
SilverStripe\Core\Injector\Injector:
# Default logger implementation for general purpose use
Psr\Log\LoggerInterface:
calls:
pushFileLogHandler: [ pushHandler, [ %$LogFileHandler ]]
# Save system logs to file
pushFileLogHandler: [ pushHandler, [ %$LogFileHandler ]]
# Core error handler for system use
Psr\Log\LoggerInterface.errorhandler:
calls:
# Save errors to file
pushFileLogHandler: [ pushHandler, [ %$LogFileHandler ]]
# Format and display errors in the browser/CLI
pushDisplayErrorHandler: [ pushHandler, [ %$DisplayErrorHandler ]]
# Custom handler to log to a file
LogFileHandler:
class: Monolog\Handler\StreamHandler
constructor:
@ -200,12 +232,16 @@ SilverStripe\Core\Injector\Injector:
properties:
Formatter: %$Monolog\Formatter\HtmlFormatter
ContentType: text/html
# Handler for displaying errors in the browser or CLI
DisplayErrorHandler:
class: SilverStripe\Logging\HTTPOutputHandler
constructor:
- "error"
properties:
Formatter: %$SilverStripe\Logging\DebugViewFriendlyErrorFormatter
# Configuration for the "friendly" error formatter
SilverStripe\Logging\DebugViewFriendlyErrorFormatter:
class: SilverStripe\Logging\DebugViewFriendlyErrorFormatter
properties:
@ -214,7 +250,7 @@ SilverStripe\Core\Injector\Injector:
```
<div class="info" markdown="1">
In addition to SilverStripe-integrated logging, it is advisable to fall back to PHPs native logging functionality. A
In addition to SilverStripe-integrated logging, it is advisable to fall back to PHP's native logging functionality. A
script might terminate before it reaches the SilverStripe error handling, for example in the case of a fatal error. Make
sure `log_errors` and `error_log` in your PHP ini file are configured.
</div>
@ -228,11 +264,12 @@ others.
### Replacing the logger
Monolog comes by default with SilverStripe, but you may use another PSR-3 compliant logger, if you wish. To do this,
set the `Injector.Logger` configuration parameter, providing a new injector definition. For example:
set the `SilverStripe\Core\Injector\Injector.Monolog\Logger` configuration parameter, providing a new injector
definition. For example:
```yaml
SilverStripe\Core\Injector\Injector:
ErrorHandler:
SilverStripe\Logging\ErrorHandler:
class: Logging\Logger
constructor:
- 'alternative-logger'
@ -243,7 +280,8 @@ be ignored.
### Replacing the error handler
The Injector service `ErrorHandler` is responsible for initialising the error handler. By default it
The Injector service `SilverStripe\Logging\ErrorHandler` is responsible for initialising the error handler. By default
it:
* Create a `SilverStripe\Logging\MonologErrorHandler` object.
* Attach the registered service `Psr\Log\LoggerInterface` to it, to start the error handler.
@ -255,7 +293,7 @@ another. To replace this, you should registered a new service, `ErrorHandlerLoad
```yaml
SilverStripe\Core\Injector\Injector:
ErrorHandler:
SilverStripe\Logging\ErrorHandler:
class: MyApp\CustomErrorHandlerLoader
```

42
src/Dev/State/LoggerState.php Normal file
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@ -0,0 +1,42 @@
<?php
namespace SilverStripe\Dev\State;
use Monolog\Handler\NullHandler;
use Monolog\Logger;
use Psr\Log\LoggerInterface;
use SilverStripe\Core\Injector\Injector;
use SilverStripe\Dev\SapphireTest;
/**
* Disables any user configured loggers by pushing a NullHandler during PHPUnit tests.
*
* This is designed specifically for Monolog. If using another PSR-3 compatible logging package, this will
* not do anything.
*/
class LoggerState implements TestState
{
public function setUp(SapphireTest $test)
{
/** @var Logger $userLogger */
$userLogger = Injector::inst()->get(LoggerInterface::class);
if ($userLogger && $userLogger instanceof Logger) {
$userLogger->setHandlers([new NullHandler()]);
}
}
public function tearDown(SapphireTest $test)
{
// noop
}
public function setUpOnce($class)
{
// noop
}
public function tearDownOnce($class)
{
// noop
}
}

6
src/Logging/DebugViewFriendlyErrorFormatter.php
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@ -48,10 +48,12 @@ class DebugViewFriendlyErrorFormatter implements FormatterInterface
* Set default status code
*
* @param int $statusCode
* @return $this
*/
public function setStatusCode($statusCode)
{
$this->statusCode = $statusCode;
return $this;
}
/**
@ -68,10 +70,12 @@ class DebugViewFriendlyErrorFormatter implements FormatterInterface
* Set friendly title
*
* @param string $title
* @return $this
*/
public function setTitle($title)
{
$this->friendlyErrorMessage = $title;
return $this;
}
/**
@ -88,10 +92,12 @@ class DebugViewFriendlyErrorFormatter implements FormatterInterface
* Set default error body
*
* @param string $body
* @return $this
*/
public function setBody($body)
{
$this->friendlyErrorDetail = $body;
return $this;
}
public function format(array $record)

2
src/Logging/DetailedErrorFormatter.php
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@ -79,7 +79,7 @@ class DetailedErrorFormatter implements FormatterInterface
/**
* Render a developer facing error page, showing the stack trace and details
* of the code where the error occured.
* of the code where the error occurred.
*
* @param int $errno
* @param string $errstr

10
src/Logging/HTTPOutputHandler.php
View File

@ -2,11 +2,11 @@
namespace SilverStripe\Logging;
use Monolog\Formatter\FormatterInterface;
use Monolog\Handler\AbstractProcessingHandler;
use SilverStripe\Control\Controller;
use SilverStripe\Control\Director;
use SilverStripe\Control\HTTPResponse;
use Monolog\Handler\AbstractProcessingHandler;
use Monolog\Formatter\FormatterInterface;
/**
* Output the error to the browser, with the given HTTP status code.
@ -79,7 +79,7 @@ class HTTPOutputHandler extends AbstractProcessingHandler
/**
* Set a formatter to use if Director::is_cli() is true
*
* @param $cliFormatter
* @param FormatterInterface $cliFormatter
* @return HTTPOutputHandler Return $this to allow chainable calls
*/
public function setCLIFormatter(FormatterInterface $cliFormatter)
@ -153,12 +153,12 @@ class HTTPOutputHandler extends AbstractProcessingHandler
$response = new HTTPResponse();
}
// If headers have been sent then these won't be used, and may throw errors that we wont' want to see.
// If headers have been sent then these won't be used, and may throw errors that we won't want to see.
if (!headers_sent()) {
$response->setStatusCode($this->getStatusCode());
$response->addHeader('Content-Type', $this->getContentType());
} else {
// To supress errors aboot errors
// To suppress errors about errors
$response->setStatusCode(200);
}

72
src/Logging/MonologErrorHandler.php
View File

@ -2,45 +2,97 @@
namespace SilverStripe\Logging;
use InvalidArgumentException;
use Psr\Log\LoggerInterface;
use Monolog\ErrorHandler as MonologHandler;
use SilverStripe\Dev\Deprecation;
class MonologErrorHandler implements ErrorHandler
{
/**
* @var LoggerInterface
* @var LoggerInterface[]
*/
private $logger;
private $loggers = [];
/**
* Set the PSR-3 logger to send errors & exceptions to
* Set the PSR-3 logger to send errors & exceptions to. Will overwrite any previously configured
* loggers
*
* @deprecated 4.4.0:5.0.0 Use pushHandler() instead
* @param LoggerInterface $logger
* @return $this
*/
public function setLogger(LoggerInterface $logger)
{
$this->logger = $logger;
Deprecation::notice('4.4.0', 'Please use pushHandler() instead');
$this->loggers = [$logger];
return $this;
}
/**
* Get the PSR-3 logger to send errors & exceptions to
* Get the first registered PSR-3 logger to send errors & exceptions to
*
* @deprecated 4.4.0:5.0.0 Use getHandlers() instead
* @return LoggerInterface
*/
public function getLogger()
{
return $this->logger;
Deprecation::notice('4.4.0', 'Please use getHandlers() instead');
return reset($this->loggers);
}
/**
* Adds a PSR-3 logger to send messages to, to the end of the stack
*
* @param LoggerInterface $logger
* @return $this
*/
public function pushLogger(LoggerInterface $logger)
{
$this->loggers[] = $logger;
return $this;
}
/**
* Returns the stack of PSR-3 loggers
*
* @return LoggerInterface[]
*/
public function getLoggers()
{
return $this->loggers;
}
/**
* Set the PSR-3 loggers (overwrites any previously configured values)
*
* @param LoggerInterface[] $loggers
* @return $this
*/
public function setLoggers(array $loggers)
{
$this->loggers = $loggers;
return $this;
}
/**
* {@inheritDoc}
*
* @throws InvalidArgumentException
*/
public function start()
{
if (!$this->getLogger()) {
throw new \InvalidArgumentException("No Logger property passed to MonologErrorHandler."
. "Is your Injector config correct?");
$loggers = $this->getLoggers();
if (empty($loggers)) {
throw new InvalidArgumentException(
"No Logger properties passed to MonologErrorHandler. Is your Injector config correct?"
);
}
MonologHandler::register($this->getLogger());
foreach ($loggers as $logger) {
MonologHandler::register($logger);
}
}
}

19
tests/php/Logging/MonologErrorHandlerTest.php
View File

@ -2,6 +2,7 @@
namespace SilverStripe\Logging\Tests;
use Psr\Log\LoggerInterface;
use SilverStripe\Dev\SapphireTest;
use SilverStripe\Logging\MonologErrorHandler;
@ -9,11 +10,27 @@ class MonologErrorHandlerTest extends SapphireTest
{
/**
* @expectedException \InvalidArgumentException
* @expectedExceptionMessageRegExp /No Logger property passed to MonologErrorHandler/
* @expectedExceptionMessageRegExp /No Logger properties passed to MonologErrorHandler/
*/
public function testStartThrowsExceptionWithoutLoggerDefined()
{
$handler = new MonologErrorHandler();
$handler->start();
}
public function testSetLoggerResetsStack()
{
/** @var LoggerInterface $logger */
$logger = $this->createMock(LoggerInterface::class);
$handler = new MonologErrorHandler();
$handler->pushLogger($logger)->pushLogger($logger);
$this->assertCount(2, $handler->getLoggers(), 'Loggers are pushed to the stack');
$handler->setLogger($logger);
$this->assertCount(1, $handler->getLoggers(), 'setLogger resets stack and pushes');
$handler->setLoggers([]);
$this->assertCount(0, $handler->getLoggers(), 'setLoggers overwrites all configured loggers');
}
}