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annotate xml/doAmazonRequest.php @ 57:7f90ac957713

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necessary when included inside a function
author Charlie Root
date Sun, 09 Jun 2019 06:47:19 -0400
parents 72708ec9c0e6
children e4c78b3eace7
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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1 <?php
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2 include_once "dlog.php";
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3
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4 include_once "web.php";
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5 include "aws_signed_request.php";
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6
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7 function doAmazonRequest($ext, $parameters, $try, $dbl='x', $wantXML=True)
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8 {
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9 global $public_key, $private_key;
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10 $requestURI = $_SERVER['REQUEST_URI'];
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11 $requestIP = $_SERVER['REMOTE_ADDR'];
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12 $file_data=$ext;
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13 ksort($parameters);
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14 foreach ($parameters as $i=>$d) {
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15 $file_data.='&'.$i.'='.$d;
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16 }
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17 $gotit=0;
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18 $url=aws_signed_request($ext,$parameters,$public_key,$private_key);
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19 //dl("search: $ext $public_key $private_key\n$url\n".print_r($parameters,TRUE)."\n");
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20 for ($i=1; $i<=$try; $i++) {
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21 dl("dar: $requestIP $i\n");
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22 $crl = curl_init();
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23 $timeout = 5;
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24 curl_setopt ($crl, CURLOPT_URL,$url);
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25 curl_setopt ($crl, CURLOPT_ENCODING , "gzip");
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26 curl_setopt ($crl, CURLOPT_RETURNTRANSFER, 1);
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27 curl_setopt ($crl, CURLOPT_CONNECTTIMEOUT, $timeout);
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28 $semaphore = new SyncSemaphore("Amazon".$ext);
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29 $gotit = $semaphore->lock(5000);
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30 if (!$gotit) {
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31 dl("No lock: $requestIP $dbl\n");
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32 for ($j=1; $j<=$try+4; $j++) {
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33 dl("dar: $requestIP $i $j\n");
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34 $gotit=$semaphore->lock(1000);
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35 if ($gotit) {
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36 dl("Got it: $i $j $requestIP $dbl"."a\n");
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37 break;
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38 }
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39 }
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40 }
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41 else {
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42 dl("Got it: $i ! $requestIP $dbl"."a\n");
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43 }
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44 if (!$gotit) {
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45 usleep(1000000);
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46 continue;
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47 }
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48 usleep(1000000);
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49 $output = curl_exec($crl);
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50 dl("nai2: $gotit ".strlen($output)."\n");
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51 curl_close($crl);
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52 $mm=array();
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53 try {
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54 $xml = new SimpleXMLElement($output);
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55 }
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56 catch (Exception $e) {
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57 dl("dar: bad output:\n$output\n");
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58 throw $e;
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59 }
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60 if (preg_match("/<Error>/",$output,$mm)) {
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61 $resName=$xml->getName();
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62 $code=$xml->Error->Code;
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63 if ($code) {
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64 $message=$xml->Error->Message;
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65 }
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66 else {
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67 $code=$xml->Items->Request->Errors->Error->Code;
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68 $message=$xml->Items->Request->Errors->Error->Message;
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69 }
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70 dl("Losing $i: $dbl ".
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71 $mm[0].", $resName, $code, $requestIP, $requestURI\n");
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72 if ($code!='RequestThrottled') {
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73 dl("message: $message\n");
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74 if ($code=='AWS.InvalidParameterValue' && strpos($message,"for ItemId.")>0) {
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75 // Check for common problem and try to fix...
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76 $spd=$parameters['ItemId'];
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77 if (strpos($spd,'/')>0) {
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78 $isbnMaybe=substr($spd,0,strpos($spd,'/'));
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79 $parameters['ItemId']=$isbnMaybe;
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80 if (isset($parameters['Keywords'])) {
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81 $parameters['Keywords']=urlencode($isbnMaybe);
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82 }
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83 dl("retrying with $isbnMaybe\n");
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84 if ($gotit) {
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85 $semaphore->unlock();
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86 }
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87 return doAmazonRequest($ext,$parameters,$try,$dbl);
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88 }
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89 }
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90 if ($code=="") {
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91 dl("error elt:\n$output\n");
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92 }
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93 if ($gotit) {
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94 $semaphore->unlock();
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95 }
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96 throw new Exception($code);
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97 }
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98 }
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99 else {
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100 if ($gotit) {
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101 $cnt=0;
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102 $semaphore->unlock($cnt);
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103 dl("unlocked: $i $cnt\n");
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104 }
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105 if ($wantXML) {
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106 return $xml;
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107 }
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108 else {
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109 //dl("returning ".strlen($output)."\n");
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110 return $output;
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111 }
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112 }
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113 usleep(100000*$i); // Try to reduce throttling until we get a
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114 // principled solution in place
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115 if ($gotit) {
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116 $semaphore->unlock();
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117 }
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118 }
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119 throw new Exception("ThrottledRepeatedly");
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120 }
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121 ?>