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1 | <?php |
2 | namespace Shakemaps\Webservice; |
3 | |
4 | use ArrayIterator; |
5 | use IteratorAggregate; |
6 | use Traversable; |
7 | |
8 | use Fdsn\DataStructure\LatLon as DS_LatLon; |
9 | |
10 | /** |
11 | * Fetch grid.xml intensity file from Shakemaps portal |
12 | * |
13 | * @param string $eventId Id quake to scan for data (not in FDSN format to support shakemapseu portal idevent format) |
14 | * @param string $shakemapsServer (nullable) Server FQDN to connect to (default is shakemaps.rm.ingv.it) |
15 | * @param string $localFileFullPath (nullable) path to fetch local file (if exists AND is readable) |
16 | */ |
17 | class Intensity implements IteratorAggregate { |
18 | private const dataFile = 'grid.xml'; |
19 | |
20 | private string $server; |
21 | private string $eventId; |
22 | |
23 | private ?string $localFileFullPath = null; |
24 | |
25 | private string $curlErrInfo; |
26 | private int $curlErrNum; |
27 | private array $places = array(); |
28 | |
29 | function __construct ( string $eventId, ?string $shakemapsServer = Settings::defaultShakemapsServer, ?string $localFileFullPath = null ) { |
30 | |
31 | $this->eventId = $eventId; |
32 | $this->server = empty($shakemapsServer) ? Settings::defaultShakemapsServer : $shakemapsServer; |
33 | |
34 | if ( is_null($localFileFullPath) ) |
35 | return; |
36 | |
37 | $this->localFileFullPath = $localFileFullPath; |
38 | } |
39 | |
40 | /** |
41 | * get all places intensity |
42 | * |
43 | * @return array locality intensity (array of associative arrays[DS_LatLon, mmi, pga, pgv, psa03, psa10, psa30, svel]) |
44 | */ |
45 | public function getIterator():Traversable{ return new ArrayIterator($this->places); } |
46 | |
47 | /** |
48 | * Fetch data (remote or local - if $localFileFullPath is set in __construct) |
49 | * |
50 | * @return int number of data found |
51 | * |
52 | * @internal DOMDocument::load(): <grid_data> contains a HUGE CSV text and xmlSAX2Characters crash |
53 | * so i must parse it like an array |
54 | */ |
55 | public function fetch():int{ |
56 | $xmlString = is_null($this->localFileFullPath) ? $this->fetchFromUrl() : $this->fetchFromLocalPath(); |
57 | |
58 | $xmlAsArray = preg_split("/\n/", $xmlString); |
59 | foreach($xmlAsArray as $line){ |
60 | if( ! preg_match('/^[0-9]/', $line) ) |
61 | continue; |
62 | |
63 | list($lon, $lat, $mmi, $pga, $pgv, $psa03, $psa10, $psa30, $svel) = preg_split('[\s]', trim($line) ); |
64 | $this->places[] = array( |
65 | 'point' => new DS_LatLon($lat, $lon), |
66 | 'mmi' => $mmi, |
67 | 'pga' => $pga, |
68 | 'pgv' => $pgv, |
69 | 'psa03' => $psa03, |
70 | 'psa10' => $psa10, |
71 | 'psa30' => $psa30, |
72 | 'svel' => $svel |
73 | ); |
74 | } |
75 | |
76 | return count($this->places); |
77 | } |
78 | |
79 | |
80 | /** |
81 | * fetch data from local path - if $localFileFullPath is set in __construct() |
82 | * |
83 | * @return string Datafile read in a string or, on missing/unreadable file a RuntimeException is thrown |
84 | */ |
85 | function fetchFromLocalPath():string { |
86 | if ( ! file_exists($this->localFileFullPath) || ! is_readable($this->localFileFullPath) ) |
87 | throw new \RuntimeException(sprintf("[%s] file %s not exists or is not readable", __METHOD__, $this->localFileFullPath)); |
88 | |
89 | return file_get_contents( $this->localFileFullPath); |
90 | } |
91 | |
92 | /** |
93 | * fetch data from url (remote or local - if $localFileFullPath is set in __construct) |
94 | * |
95 | * @return int number of data found |
96 | */ |
97 | private function fetchFromUrl():string{ |
98 | $curlSession = curl_init(); |
99 | curl_setopt_array($curlSession, array( |
100 | CURLOPT_URL => sprintf(Settings::basePath, |
101 | $this->server, $this->eventId, self::dataFile), |
102 | CURLOPT_HEADER => false, |
103 | CURLOPT_CUSTOMREQUEST => 'GET', |
104 | CURLOPT_RETURNTRANSFER => 1, |
105 | CURLOPT_TIMEOUT => 60 |
106 | ) |
107 | ); |
108 | |
109 | $response = curl_exec($curlSession); |
110 | $this->curlErrNum = curl_errno($curlSession); |
111 | $this->curlErrInfo = curl_error($curlSession); |
112 | curl_close($curlSession); |
113 | |
114 | if(CURLE_OK != $this->curlErrNum) |
115 | throw new \RuntimeException( sprintf("[%s] [CurlErr: %d] %s", __METHOD__, $this->curlErrNum, $this->curlErrInfo)); |
116 | |
117 | return $response; |
118 | } |
119 | } |
120 | ?> |