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annotate xml/doAmazonRequest.php @ 50:99a730ffeaf6

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more parameterisation
author Charlie Root
date Sun, 27 Jan 2019 14:24:02 -0500
parents a67bf725e87b
children dd93cb4b77ad
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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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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 $crl = curl_init();
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22 $timeout = 5;
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23 curl_setopt ($crl, CURLOPT_URL,$url);
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24 curl_setopt ($crl, CURLOPT_ENCODING , "gzip");
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25 curl_setopt ($crl, CURLOPT_RETURNTRANSFER, 1);
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26 curl_setopt ($crl, CURLOPT_CONNECTTIMEOUT, $timeout);
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27 $semaphore = new SyncSemaphore("Amazon");
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28 $gotit = $semaphore->lock(1000);
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29 if (!$gotit) {
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30 dl("Got it: ".(int)$gotit." $requestIP $dbl\n");
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31 $gotit=$semaphore->lock(1000);
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32 dl("Got it: ".(int)$gotit." $requestIP $dbl"."a\n");
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33 }
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34 $output = curl_exec($crl);
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35 //dl("nai2: ".strlen($output)."\n");
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36
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37 curl_close($crl);
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38 usleep(500000);
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39 if ($gotit) {
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40 $semaphore->unlock();
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41 }
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42 else {
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43 dl("W/o lock for $requestIP $dbl"."b\n");
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44 }
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45 $mm=array();
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46 $xml = new SimpleXMLElement($output);
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47 if (preg_match("/<Error>/",$output,$mm)) {
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48 $resName=$xml->getName();
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49 $code=$xml->Error->Code;
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50 if ($code) {
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51 $message=$xml->Error->Message;
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52 }
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53 else {
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54 $code=$xml->Items->Request->Errors->Error->Code;
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55 $message=$xml->Items->Request->Errors->Error->Message;
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56 }
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57 dl("Losing $i: $dbl ".
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58 $mm[0].", $resName, $code, $requestIP, $requestURI\n");
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59 if ($code!='RequestThrottled') {
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60 dl("message: $message\n");
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61 if ($code=='AWS.InvalidParameterValue' && strpos($message,"for ItemId.")>0) {
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62 // Check for common problem and try to fix...
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63 $spd=$parameters['ItemId'];
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64 if (strpos($spd,'/')>0) {
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65 $isbnMaybe=substr($spd,0,strpos($spd,'/'));
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66 $parameters['ItemId']=$isbnMaybe;
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67 if (isset($parameters['Keywords'])) {
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68 $parameters['Keywords']=urlencode($isbnMaybe);
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69 }
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70 dl("retrying with $isbnMaybe\n");
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71 return doAmazonRequest($ext,$parameters,$try,$dbl);
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72 }
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73 }
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74 if ($code=="") {
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75 dl("error elt:\n$output\n");
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76 }
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77 throw new Exception($code);
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78 }
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79 }
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80 else {
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81 if ($wantXML) {
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82 return $xml;
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83 }
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84 else {
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85 //dl("returning ".strlen($output)."\n");
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86 return $output;
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87 }
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88 }
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89 usleep(100000*$i); // Try to reduce throttling until we get a
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90 // principled solution in place
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91 }
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92 throw new Exception("ThrottledRepeatedly");
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93 }
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94 ?>