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1 | <?php |
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2 | |||
3 | /** |
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4 | * Represents a suite of environment checks. |
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5 | * Specific checks can be registered against a named instance of EnvironmentCheckSuite. |
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6 | * |
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7 | * Usage #1 - _config.php |
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8 | * EnvironmentCheckSuite::register('health', 'MyHealthCheck("my param")', 'Title of my health check'); |
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9 | * |
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10 | * Usage #2 - config.yml |
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11 | * EnvironmentCheckSuite: |
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12 | * registered_checks: |
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13 | * mycheck: |
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14 | * definition: 'MyHealthCheck("my param")' |
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15 | * title: 'Title of my health check' |
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16 | * registered_suites: |
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17 | * health: |
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18 | * - mycheck |
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19 | * |
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20 | * $result = EnvironmentCheckSuite::inst('health')->run(); |
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21 | */ |
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22 | class EnvironmentCheckSuite extends Object { |
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23 | /** |
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24 | * Name of this suite. |
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25 | * |
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26 | * @var string |
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27 | */ |
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28 | protected $name; |
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29 | |||
30 | /** |
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31 | * @var array |
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32 | */ |
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33 | protected $checks = array(); |
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34 | |||
35 | /** |
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36 | * Associative array of named checks registered via the config system. Each check should specify: |
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37 | * - definition (e.g. 'MyHealthCheck("my param")') |
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38 | * - title (e.g. 'Is my feature working?') |
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39 | * - state (setting this to 'disabled' will cause suites to skip this check entirely. |
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40 | * |
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41 | * @var array |
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42 | */ |
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43 | private static $registered_checks = array(); |
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44 | |||
45 | /** |
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46 | * Associative array of named suites registered via the config system. Each suite should enumerate |
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47 | * named checks that have been configured in 'registered_checks'. |
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48 | * |
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49 | * @var array |
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50 | */ |
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51 | private static $registered_suites = array(); |
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52 | |||
53 | /** |
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54 | * Load checks for this suite from the configuration system. This is an alternative to the |
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55 | * EnvironmentCheckSuite::register - both can be used, checks will be appended to the suite. |
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56 | * |
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57 | * @param string $suiteName The name of this suite. |
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58 | */ |
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59 | public function __construct($suiteName) { |
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60 | parent::__construct(); |
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61 | |||
62 | if (empty($this->config()->registered_suites[$suiteName])) { |
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63 | // Not registered via config system, but it still may be configured later via self::register. |
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64 | return; |
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65 | } |
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66 | |||
67 | foreach ($this->config()->registered_suites[$suiteName] as $checkName) { |
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68 | if (empty($this->config()->registered_checks[$checkName])) { |
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69 | throw new InvalidArgumentException( |
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70 | "Bad EnvironmentCheck: '$checkName' - the named check has not been registered." |
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71 | ); |
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72 | } |
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73 | |||
74 | $check = $this->config()->registered_checks[$checkName]; |
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75 | |||
76 | // Existing named checks can be disabled by setting their 'state' to 'disabled'. |
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77 | // This is handy for disabling checks mandated by modules. |
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78 | if (!empty($check['state']) && $check['state']==='disabled') continue; |
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79 | |||
80 | // Add the check to this suite. |
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81 | $this->push($check['definition'], $check['title']); |
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82 | } |
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83 | } |
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84 | |||
85 | /** |
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86 | * Run this test suite and return the result code of the worst result. |
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87 | * |
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88 | * @return int |
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89 | */ |
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90 | public function run() { |
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91 | $result = new EnvironmentCheckSuiteResult(); |
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92 | |||
93 | foreach($this->checkInstances() as $check) { |
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94 | list($checkClass, $checkTitle) = $check; |
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95 | try { |
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96 | list($status, $message) = $checkClass->check(); |
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97 | // If the check fails, register that as an error |
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98 | } catch(Exception $e) { |
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99 | $status = EnvironmentCheck::ERROR; |
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100 | $message = $e->getMessage(); |
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101 | } |
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102 | $result->addResult($status, $message, $checkTitle); |
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103 | } |
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104 | |||
105 | return $result; |
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106 | } |
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107 | |||
108 | /** |
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109 | * Get instances of all the environment checks. |
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110 | * |
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111 | * @return array |
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112 | */ |
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113 | protected function checkInstances() { |
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114 | $output = array(); |
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115 | foreach($this->checks as $check) { |
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116 | list($checkClass, $checkTitle) = $check; |
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117 | if(is_string($checkClass)) { |
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118 | $checkInst = Object::create_from_string($checkClass); |
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119 | if($checkInst instanceof EnvironmentCheck) { |
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120 | $output[] = array($checkInst, $checkTitle); |
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121 | } else { |
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122 | throw new InvalidArgumentException("Bad EnvironmentCheck: '$checkClass' - the named class doesn't implement EnvironmentCheck"); |
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123 | } |
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124 | } else if($checkClass instanceof EnvironmentCheck) { |
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125 | $output[] = array($checkClass, $checkTitle); |
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126 | } else { |
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127 | throw new InvalidArgumentException("Bad EnvironmentCheck: " . var_export($check, true)); |
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128 | } |
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129 | } |
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130 | return $output; |
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131 | } |
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132 | |||
133 | /** |
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134 | * Add a check to this suite. |
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135 | * |
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136 | * @param mixed $check |
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137 | * @param string $title |
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138 | */ |
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139 | public function push($check, $title = null) { |
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140 | if(!$title) { |
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141 | $title = is_string($check) ? $check : get_class($check); |
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142 | } |
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143 | $this->checks[] = array($check, $title); |
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144 | } |
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145 | |||
146 | ///////////////////////////////////////////////////////////////////////////////////////////// |
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147 | |||
148 | /** |
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149 | * @var array |
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150 | */ |
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151 | protected static $instances = array(); |
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152 | |||
153 | /** |
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154 | * Return a named instance of EnvironmentCheckSuite. |
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155 | * |
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156 | * @param string $name |
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157 | * |
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158 | * @return EnvironmentCheckSuite |
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159 | */ |
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160 | static function inst($name) { |
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161 | if(!isset(self::$instances[$name])) self::$instances[$name] = new EnvironmentCheckSuite($name); |
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162 | return self::$instances[$name]; |
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163 | } |
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164 | |||
165 | /** |
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166 | * Register a check against the named check suite. |
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167 | * |
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168 | * @param string|array $names |
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169 | * @param EnvironmentCheck $check |
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170 | * @param string|array |
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171 | */ |
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172 | static function register($names, $check, $title = null) { |
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173 | if(!is_array($names)) $names = array($names); |
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174 | foreach($names as $name) self::inst($name)->push($check, $title); |
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175 | } |
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176 | |||
177 | /** |
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178 | * Unregisters all checks. |
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179 | */ |
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180 | static function reset() { |
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181 | self::$instances = array(); |
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182 | } |
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183 | } |
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184 | |||
185 | /** |
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186 | * A single set of results from running an EnvironmentCheckSuite |
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187 | */ |
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188 | class EnvironmentCheckSuiteResult extends ViewableData { |
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189 | /** |
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190 | * @var ArrayList |
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191 | */ |
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192 | protected $details; |
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193 | |||
194 | /** |
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195 | * @var int |
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196 | */ |
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197 | protected $worst = 0; |
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198 | |||
199 | function __construct() { |
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200 | parent::__construct(); |
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201 | $this->details = new ArrayList(); |
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202 | } |
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203 | |||
204 | /** |
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205 | * @param int $status |
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206 | * @param string $message |
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207 | * @param string $checkIdentifier |
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208 | */ |
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209 | function addResult($status, $message, $checkIdentifier) { |
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210 | $this->details->push(new ArrayData(array( |
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211 | 'Check' => $checkIdentifier, |
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212 | 'Status' => $this->statusText($status), |
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213 | 'StatusCode' => $status, |
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214 | 'Message' => $message, |
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215 | ))); |
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216 | |||
217 | $this->worst = max($this->worst, $status); |
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218 | } |
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219 | |||
220 | /** |
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221 | * Returns true if there are no errors. |
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222 | * |
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223 | * @return bool |
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224 | */ |
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225 | public function ShouldPass() { |
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226 | return $this->worst <= EnvironmentCheck::WARNING; |
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227 | } |
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228 | |||
229 | /** |
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230 | * Returns overall (i.e. worst) status as a string. |
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231 | * |
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232 | * @return string |
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233 | */ |
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234 | function Status() { |
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235 | return $this->statusText($this->worst); |
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236 | } |
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237 | |||
238 | /** |
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239 | * Returns detailed status information about each check. |
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240 | * |
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241 | * @return ArrayList |
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242 | */ |
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243 | function Details() { |
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244 | return $this->details; |
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245 | } |
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246 | |||
247 | /** |
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248 | * Convert the final result status and details to JSON. |
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249 | * |
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250 | * @return string |
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251 | */ |
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252 | function toJSON() { |
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253 | $result = array( |
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254 | 'Status' => $this->Status(), |
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255 | 'ShouldPass' => $this->ShouldPass(), |
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256 | 'Checks' => array() |
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257 | ); |
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258 | foreach($this->details as $detail) { |
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259 | $result['Checks'][] = $detail->toMap(); |
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260 | } |
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261 | return json_encode($result); |
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262 | } |
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263 | |||
264 | /** |
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265 | * Return a text version of a status code. |
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266 | * |
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267 | * @return string |
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268 | */ |
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269 | protected function statusText($status) { |
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270 | switch($status) { |
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271 | case EnvironmentCheck::ERROR: return "ERROR"; |
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272 | case EnvironmentCheck::WARNING: return "WARNING"; |
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273 | case EnvironmentCheck::OK: return "OK"; |
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274 | case 0: return "NO CHECKS"; |
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275 | default: throw new InvalidArgumentException("Bad environment check status '$status'"); |
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276 | } |
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277 | } |
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278 | } |
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279 |
Adding explicit visibility (
private
,protected
, orpublic
) is generally recommend to communicate to other developers how, and from where this method is intended to be used.