silverstripe-environmentcheck/code/EnvironmentCheckSuite.php

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<?php
/**
* Represents a suite of environment checks.
* Also has a register for assigning environment checks to named instances of EnvironmentCheckSuite
*
* Usage:
* EnvironmentCheckSuite::register('health', 'MyHealthCheck');
*
* $result = EnvironmentCheckSuite::inst('health')->run();
*/
class EnvironmentCheckSuite {
protected $checks = array();
/**
* Run this test suite
* @return The result code of the worst result.
*/
public function run() {
$worstResult = 0;
$result = new EnvironmentCheckSuiteResult;
foreach($this->checkInstances() as $check) {
list($checkClass, $checkTitle) = $check;
try {
list($status, $message) = $checkClass->check();
// If the check fails, register that as an error
} catch(Exception $e) {
$status = EnvironmentCheck::ERROR;
$message = $e->getMessage();
}
$result->addResult($status, $message, $checkTitle);
}
return $result;
}
/**
* Get instances of all the environment checks
*/
protected function checkInstances() {
$output = array();
foreach($this->checks as $check) {
list($checkClass, $checkTitle) = $check;
if(is_string($checkClass)) {
$checkInst = Object::create_from_string($checkClass);
if($checkInst instanceof EnvironmentCheck) {
$output[] = array($checkInst, $checkTitle);
} else {
throw new InvalidArgumentException("Bad EnvironmentCheck: '$checkClass' - the named class doesn't implement EnvironmentCheck");
}
} else if($checkClass instanceof EnvironmentCheck) {
$output[] = array($checkClass, $checkTitle);
} else {
throw new InvalidArgumentException("Bad EnvironmentCheck: " . var_export($check, true));
}
}
return $output;
}
/**
* Add a check to this suite.
*
*/
public function push($check, $title = null) {
if(!$title) {
$title = is_string($check) ? $check : get_class($check);
}
$this->checks[] = array($check, $title);
}
/////////////////////////////////////////////////////////////////////////////////////////////
protected static $instances = array();
/**
* Return a named instance of EnvironmentCheckSuite.
*/
static function inst($name) {
if(!isset(self::$instances[$name])) self::$instances[$name] = new EnvironmentCheckSuite();
return self::$instances[$name];
}
/**
* Register a check against the named check suite.
*
* @param String|Array
*/
static function register($names, $check, $title = null) {
if(!is_array($names)) $names = array($names);
foreach($names as $name) self::inst($name)->push($check, $title);
}
}
/**
* A single set of results from running an EnvironmentCheckSuite
*/
class EnvironmentCheckSuiteResult extends ViewableData {
protected $details, $worst = 0;
function __construct() {
parent::__construct();
$this->details = new ArrayList();
}
function addResult($status, $message, $checkIdentifier) {
$this->details->push(new ArrayData(array(
'Check' => $checkIdentifier,
'Status' => $this->statusText($status),
'Message' => $message,
)));
$this->worst = max($this->worst, $status);
}
/**
* Returns true if there are no ERRORs, only WARNINGs or OK
*/
function ShouldPass() {
return $this->worst <= EnvironmentCheck::WARNING;
}
/**
* Returns overall (i.e. worst) status as a string.
*/
function Status() {
return $this->statusText($this->worst);
}
/**
* Returns detailed status information about each check
*/
function Details() {
return $this->details;
}
/**
* Return a text version of a status code
*/
protected function statusText($status) {
switch($status) {
case EnvironmentCheck::ERROR: return "ERROR";
case EnvironmentCheck::WARNING: return "WARNING";
case EnvironmentCheck::OK: return "OK";
case 0: return "NO CHECKS";
default: throw new InvalidArgumentException("Bad environment check status '$status'");
}
}
}