1 | <?php |
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2 | /** |
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3 | * t29Log is a very lightweight logging system for t29v6. |
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4 | * |
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5 | * The logging class is accessible via the Singleton pattern, but should |
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6 | * be stored in a $GLOBAL["log"] and accessible like that everywhere. |
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7 | * The contents are printed in t29Template. |
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8 | * |
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9 | * Inspired by Klooger for PHP: https://github.com/katzgrau/KLogger/ |
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10 | **/ |
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11 | |
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12 | |
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13 | class t29Log { |
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14 | const EMERG = 'emerg'; // Emergency: system is unusable |
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15 | const ALERT = 'alert'; // Alert: action must be taken immediately |
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16 | const CRIT = 'crit'; // Critical: critical conditions |
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17 | const ERR = 'err'; // Error: error conditions |
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18 | const WARN = 'warn'; // Warning: warning conditions |
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19 | const NOTICE = 'notice'; // Notice: normal but significant condition |
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20 | const INFO = 'info'; // Informational: informational messages |
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21 | const DEBUG = 'debug'; // Debug: debug messages |
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22 | |
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23 | /** |
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24 | * We need a default argument value in order to add the ability to easily |
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25 | * print out objects etc. But we can't use NULL, 0, FALSE, etc, because those |
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26 | * are often the values the developers will test for. So we'll make one up. |
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27 | */ |
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28 | const NO_ARGUMENTS = 't29Log::NO_ARGUMENTS'; |
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29 | /* |
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30 | log array format: |
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31 | [ |
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32 | [LEVEL,string], |
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33 | [LEVEL,string], |
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34 | [LEVEL,string], |
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35 | ... |
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36 | ] |
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37 | */ |
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38 | public $entries = array(); |
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39 | |
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40 | // the one global t29Log instance |
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41 | private static $instance; |
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42 | |
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43 | // singleton access method |
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44 | static public function get() { |
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45 | if(!isset(self::$instance)) |
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46 | self::$instance = new t29Log; |
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47 | return self::$instance; |
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48 | } |
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49 | |
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50 | private function __construct() { |
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51 | // we shall be the PHP error handler |
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52 | set_error_handler(array($this, 'log_phperror')); |
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53 | |
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54 | // and register a final shutdown function |
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55 | register_shutdown_function(array($this, 'php_shutdown')); |
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56 | } |
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57 | |
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58 | function log($line, $severity, $args = self::NO_ARGUMENTS) { |
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59 | if($args !== self::NO_ARGUMENTS) |
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60 | $line .= '; '. var_export($args, true); |
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61 | $this->entries[] = array($severity, $line); |
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62 | } |
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63 | |
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64 | function log_phperror($errno, $errstr, $errfile, $errline) { |
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65 | switch($errno) { |
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66 | case E_WARNING: $errno = self::WARN; break; |
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67 | case E_NOTICE: $errno = self::NOTICE; break; |
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68 | default: $errno = self::WARN; break; |
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69 | } |
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70 | |
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71 | $this->log("Error on line <tt class='line'>$errline</tt> in file <tt class='file'>$errfile</tt>:\n<pre>".htmlspecialchars($errstr)."</pre>", |
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72 | $errno); |
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73 | |
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74 | /* Don't execute PHP internal error handler */ |
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75 | return true; |
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76 | } |
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77 | |
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78 | function php_shutdown() { |
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79 | if(!$this->is_empty()) { |
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80 | // we still have errors. print them! |
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81 | $this->print_all('final shutdown'); |
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82 | } |
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83 | } |
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84 | |
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85 | function is_empty() { |
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86 | return empty($this->entries); |
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87 | } |
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88 | |
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89 | function print_all($ul_classes='') { |
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90 | // causal printing function. Flushes entries afterwards! |
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91 | print "<ul class='$ul_classes'>"; |
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92 | foreach($this->entries as $entry) { |
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93 | printf('<li class="%s">%s</li>'.PHP_EOL, $entry[0], $entry[1]); |
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94 | } |
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95 | print "</ul>"; |
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96 | $this->entries = array(); // flush entries! |
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97 | } |
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98 | |
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99 | // convenience functions |
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100 | public function FATAL($line, $args = self::NO_ARGUMENTS){ |
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101 | $this->log($line, self::FATAL, $args); |
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102 | } |
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103 | |
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104 | public function INFO($line, $args = self::NO_ARGUMENTS){ |
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105 | $this->log($line, self::INFO, $args); |
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106 | } |
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107 | |
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108 | public function DEBUG($line, $args = self::NO_ARGUMENTS){ |
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109 | $this->log($line, self::INFO, $args); |
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110 | } |
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111 | |
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112 | } // class |
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