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functioning rest-style chart server!

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Joshua Seigler 2016-06-30 21:01:08 -04:00
commit e1784bdd4c
8 changed files with 434 additions and 0 deletions
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views/chart.php Normal file
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<?php
use phpFastCache\CacheManager;
function getJson($url) {
if (empty($url)) {
trigger_error('Missing or empty JSON url');
}
$ch = curl_init($url);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch, CURLOPT_HTTPHEADER, array('Accept: application/json'));
curl_setopt($ch, CURLOPT_CONNECTTIMEOUT, 30);
curl_setopt($ch, CURLOPT_TIMEOUT, 30);
// http://unitstep.net/blog/2009/05/05/using-curl-in-php-to-access-https-ssltls-protected-sites/
// curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, true);
// curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, 2);
// curl_setopt($ch, CURLOPT_CAINFO, getcwd() . "/VeriSignClass3PublicPrimaryCertificationAuthority-G5.pem");
$result = curl_exec($ch);
$result = json_decode($result) or trigger_error('Couldn\'t parse JSON');
return $result;
}
function renderChart(
$pair,
$dataDuration = (7 * 24 * 60 * 60),
$dataResolution = 1800,
$format = 'svg',
$color = '#000',
$width = 800,
$height = 200,
$fontSize = 12
) {
$result = CacheManager::get('poloniex-'.$pair.'-'.$dataDuration.'-'.$format);
if (is_null($result)) {
$startTime = time() - $dataDuration;
$poloniexUrl = 'https://poloniex.com/public?command=returnChartData&currencyPair=' . $pair . '&start=' . $startTime . '&end=9999999999&period=' . $dataResolution;
$poloniexJson = CacheManager::get('poloniex-json-'.$pair.'-'.$dataDuration);
if(is_null($poloniexJson)) {
$poloniexJson = getJson($poloniexUrl);
// Write to cache for next time
CacheManager::set('poloniex-json-'.$pair.'-'.$dataDuration, $poloniexJson, $dataDuration);
}
$chartData = [];
foreach ($poloniexJson as $item) {
$chartData[$item->date] = $item->weightedAverage;
}
$poloniexChart = new NeatCharts\LineChart($chartData, [
'width'=>800,
'height'=>200,
'lineColor'=>"#1C75BC", // Dash blue
'labelColor'=>"#000",
'smoothed'=>false,
'fontSize'=>12
]);
$result = $poloniexChart->render();
if ($format == 'png') {
$im = new Imagick();
$im->setBackgroundColor(new ImagickPixel("transparent"));
$im->readImageBlob($result);
$im->setImageFormat("png32");
$result = $im->getImageBlob();
$im->clear();
$im->destroy();
}
CacheManager::set('poloniex-'.$pair.'-'.$dataDuration.'-'.$format, $result, $dataDuration);
$resultExpires = time() + $dataDuration;
} else {
$resultExpires = CacheManager::getInfo('poloniex-'.$pair.'-'.$dataDuration.'-'.$format)[ 'expired_time' ];
$startTime = $resultExpires - $dataDuration;
}
header('Expires: '.gmdate("D, d M Y H:i:s", $resultExpires));
if ($format == 'svg') {
header('Content-type: image/svg+xml; charset=utf-8');
header('Content-Disposition: inline; filename="Dash-chart-' . gmdate('Y-m-d\THis+0', $startTime) . '--' . gmdate('Y-m-d\THis+0') . '.svg"');
} else if ($format == 'png') {
header("Content-Type: image/png");
header('Content-Disposition: inline; filename="Dash-chart-' . gmdate('Y-m-d\THis+0', $startTime) . '--' . gmdate('Y-m-d\THis+0') . '.png"');
}
echo $result;
}