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annotate twitter/EpiCurl.php @ 32:8130865e9e82

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refactor to try to improve error handling
author Charlie Root
date Fri, 04 Jan 2019 09:50:55 -0500
parents 077b0a0a3e6d
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
6
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1 <?php
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2 class EpiCurl
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3 {
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4 const timeout = 3;
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5 static $inst = null;
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6 static $singleton = 0;
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7 private $mc;
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8 private $msgs;
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9 private $running;
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10 private $execStatus;
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11 private $selectStatus;
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12 private $sleepIncrement = 1.1;
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13 private $requests = array();
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14 private $responses = array();
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15 private $properties = array();
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16
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17 function __construct()
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18 {
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19 if(self::$singleton == 0)
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20 {
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21 throw new Exception('This class cannot be instantiated by the new keyword. You must instantiate it using: $obj = EpiCurl::getInstance();');
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22 }
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23
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24 $this->mc = curl_multi_init();
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25 $this->properties = array(
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26 'code' => CURLINFO_HTTP_CODE,
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27 'time' => CURLINFO_TOTAL_TIME,
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28 'length'=> CURLINFO_CONTENT_LENGTH_DOWNLOAD,
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29 'type' => CURLINFO_CONTENT_TYPE,
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30 'url' => CURLINFO_EFFECTIVE_URL
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31 );
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32 }
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33
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34 public function addCurl($ch)
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35 {
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36 $key = $this->getKey($ch);
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37 $this->requests[$key] = $ch;
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38 curl_setopt($ch, CURLOPT_HEADERFUNCTION, array($this, 'headerCallback'));
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39
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40 $code = curl_multi_add_handle($this->mc, $ch);
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41
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42 // (1)
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43 if($code === CURLM_OK || $code === CURLM_CALL_MULTI_PERFORM)
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44 {
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45 do {
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46 $code = $this->execStatus = curl_multi_exec($this->mc, $this->running);
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47 } while ($this->execStatus === CURLM_CALL_MULTI_PERFORM);
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48
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49 return new EpiCurlManager($key);
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50 }
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51 else
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52 {
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53 return $code;
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54 }
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55 }
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56
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57 public function getResult($key = null)
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58 {
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59 if($key != null)
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60 {
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61 if(isset($this->responses[$key]))
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62 {
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63 return $this->responses[$key];
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64 }
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65
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66 $innerSleepInt = $outerSleepInt = 1;
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67 while($this->running && ($this->execStatus == CURLM_OK || $this->execStatus == CURLM_CALL_MULTI_PERFORM))
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68 {
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69 usleep($outerSleepInt);
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70 $outerSleepInt = max(1, ($outerSleepInt*$this->sleepIncrement));
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71 $ms=curl_multi_select($this->mc, 0);
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72 if($ms > 0)
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73 {
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74 do{
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75 $this->execStatus = curl_multi_exec($this->mc, $this->running);
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76 usleep($innerSleepInt);
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77 $innerSleepInt = max(1, ($innerSleepInt*$this->sleepIncrement));
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78 }while($this->execStatus==CURLM_CALL_MULTI_PERFORM);
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79 $innerSleepInt = 1;
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80 }
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81 $this->storeResponses();
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82 if(isset($this->responses[$key]['data']))
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83 {
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84 return $this->responses[$key];
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85 }
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86 $runningCurrent = $this->running;
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87 }
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88 return null;
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89 }
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90 return false;
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91 }
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92
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93 private function getKey($ch)
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94 {
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95 return (string)$ch;
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96 }
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97
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98 private function headerCallback($ch, $header)
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99 {
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100 $_header = trim($header);
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101 $colonPos= strpos($_header, ':');
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102 if($colonPos > 0)
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103 {
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104 $key = substr($_header, 0, $colonPos);
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105 $val = preg_replace('/^\W+/','',substr($_header, $colonPos));
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106 $this->responses[$this->getKey($ch)]['headers'][$key] = $val;
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107 }
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108 return strlen($header);
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109 }
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110
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111 private function storeResponses()
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112 {
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113 while($done = curl_multi_info_read($this->mc))
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114 {
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115 $key = (string)$done['handle'];
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116 $this->responses[$key]['data'] = curl_multi_getcontent($done['handle']);
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117 foreach($this->properties as $name => $const)
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118 {
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119 $this->responses[$key][$name] = curl_getinfo($done['handle'], $const);
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120 }
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121 curl_multi_remove_handle($this->mc, $done['handle']);
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122 curl_close($done['handle']);
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123 }
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124 }
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125
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126 static function getInstance()
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127 {
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128 if(self::$inst == null)
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129 {
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130 self::$singleton = 1;
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131 self::$inst = new EpiCurl();
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132 }
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133
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134 return self::$inst;
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135 }
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136 }
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137
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138 class EpiCurlManager
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139 {
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140 private $key;
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141 private $epiCurl;
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142
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143 function __construct($key)
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144 {
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145 $this->key = $key;
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146 $this->epiCurl = EpiCurl::getInstance();
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147 }
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148
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149 function __get($name)
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150 {
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151 $responses = $this->epiCurl->getResult($this->key);
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152 return isset($responses[$name]) ? $responses[$name] : null;
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153 }
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154
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155 function __isset($name)
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156 {
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157 $val = self::__get($name);
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158 return empty($val);
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159 }
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160 }
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161
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162 /*
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163 * Credits:
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164 * - (1) Alistair pointed out that curl_multi_add_handle can return CURLM_CALL_MULTI_PERFORM on success.
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165 */
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166 ?>