Nimrod's Tech Blog » LittleBits CloudBit – Yahoo Weather & NewRelic Integration

Got me 2 sets of LittleBits (Space Kit & CloudBit Starter Kit)

Wanted to see how the CloudBit API works and how to integrate it with some data.

Thought of 2 main ideas:
1) display temperature in Tel-Aviv
2) display My Blog’s error rate from New Relic

The steps:
1) use the power + CloudBit + number modules to display the weather in tel aviv / application’s error rate

2) write a short PHP (GitHub) wrapper for the CloudBit api to easily send output to it.

Send output to CloudBit: (this will send 0-99 to the CloudBit output)

<?php
function sendToCloudBit($cloudBitKey, $deviceId, $durationInMillis, $value){
	$url = "https://api-http.littlebitscloud.cc/v3/devices/$deviceId/output";
	$data = array('percent' => $value, 'duration_ms' => $durationInMillis);
	$options = array(
			'http' => array(
					'header'  => "Authorization: Bearer $cloudBitKey\r\n",
					'method'  => 'POST',
					'content' => http_build_query($data),
			),
	);
	$context  = stream_context_create($options);
	$result = file_get_contents($url, false, $context);
	echo "<br>LittleBits said: $result<br>";
}
?>

<?php

function sendToCloudBit($cloudBitKey, $deviceId, $durationInMillis, $value){

$url = "https://api-http.littlebitscloud.cc/v3/devices/$deviceId/output";

$data = array('percent' => $value, 'duration_ms' => $durationInMillis);

$options = array(

'http' => array(

'header' => "Authorization: Bearer $cloudBitKey\r\n",

'method' => 'POST',

'content' => http_build_query($data),

);

$context = stream_context_create($options);

$result = file_get_contents($url, false, $context);

echo "<br>LittleBits said: $result<br>";

}

3) pull some data and send it to the cloudBit using the previous script

Get Temperature from Yahoo:

<?php
function getTemperatureFor($city, $countryCode, $metricsInFahrenheit){
	echo "<h3>Yahoo Weather In Little Bit</h3>";
	$city = urlencode($city);
	$countryCode = urlencode($countryCode);
	$metricUrl="";
	if (!$metricsInFahrenheit){
		$metricUrl = urlencode(" and u='c'");
	}
	$yahooApiURL = "https://query.yahooapis.com/v1/public/yql?q=select%20*%20from%20weather.forecast%20where%20woeid%20in%20(select%20woeid%20from%20geo.places(1)%20where%20text%3D%22$city%2C%20$countryCode%22)$metricUrl&format=json&env=store%3A%2F%2Fdatatables.org%2Falltableswithkeys";
	$jsonFromYahoo  = json_decode(file_get_contents($yahooApiURL),true);
	$tmp = $jsonFromYahoo['query']['results']['channel']['item']['condition']['temp'];
	echo "<h4>The temp is:$tmp </h4>";
	return $tmp;
}?>

<?php

function getTemperatureFor($city, $countryCode, $metricsInFahrenheit){

echo "<h3>Yahoo Weather In Little Bit</h3>";

$city = urlencode($city);

$countryCode = urlencode($countryCode);

$metricUrl="";

if (!$metricsInFahrenheit){

$metricUrl = urlencode(" and u='c'");

}

$yahooApiURL = "https://query.yahooapis.com/v1/public/yql?q=select%20*%20from%20weather.forecast%20where%20woeid%20in%20(select%20woeid%20from%20geo.places(1)%20where%20text%3D%22$city%2C%20$countryCode%22)$metricUrl&format=json&env=store%3A%2F%2Fdatatables.org%2Falltableswithkeys";

$jsonFromYahoo = json_decode(file_get_contents($yahooApiURL),true);

$tmp = $jsonFromYahoo['query']['results']['channel']['item']['condition']['temp'];

echo "<h4>The temp is:$tmp </h4>";

return $tmp;

}?>

Get my blog’s error rate from new relic (for the previous 30 minutes)

<?php
echo "New Relic Error And Little Bits<br>";
$appId = 90210; //new relic's application id
$relicKey = 'XXX'; // new relic's seacret key
$timePicker = 30; //time to measure error rate for (this is now - 30 minutes)
date_default_timezone_set('Asia/Jerusalem'); //set for your current timezone
$errorRate = getMetricFromRelic($relicKey, $appId, $timePicker);

function getMetricFromRelic($relicKey, $appId, $timePicker){
	$errorURL = 'Errors/all&values[]=error_count';
	$countURL = 'HttpDispatcher&values[]=call_count';
	$otherTransactionsURL = 'OtherTransaction/all&values[]=call_count';
	$errorKey = 'error_count';
	$countKey = 'call_count';
	$nowMinus30 = strtotime("-$timePicker minutes");
	$startTimeDate = date('Y-m-d', $nowMinus30);
	$startTimeMinutes = date('h:i:s', $nowMinus30);
	$startTimeStr = "{$startTimeDate}T{$startTimeMinutes}+02:00";
	$now = time();
	$endTimeDate = date('Y-m-d', $now);
	$endTimeMinutes = date('h:i:s', $now);
	$endTimeStr = "{$endTimeDate}T{$endTimeMinutes}+02:00";
	$errorCount = getMetrics($relicKey, $errorURL, $appId, $errorKey, $startTimeStr, $endTimeStr);
	$callCount = getMetrics($relicKey, $countURL, $appId, $countKey, $startTimeStr, $endTimeStr);
	$otherTransactionsCount = getMetrics($relicKey, $otherTransactionsURL, $appId, $countKey, $startTimeStr, $endTimeStr);
	echo "Error Count: $errorCount<br>";
	echo "Call Count: $callCount<br>";
	$errorRate = 100 * $errorCount / ($callCount + $otherTransactionsCount);
	echo "The error rate is: $errorRate<br>";
	return $errorRate;
}
function getMetrics($relicKey, $url, $appId, $jsonKey, $start, $end){
	$url = "https://api.newrelic.com/v2/applications/$appId/metrics/data.JSON?names[]=$url&from=$start&to=$end&summarize=true";
	$opts = array(
			'http'=>array(
					'method'=>"GET",
					'header'=>"X-Api-Key: $relicKey\r\n" .
					"Accept: application/json\r\n"
			)
	);
	$context = stream_context_create($opts);
	$result = file_get_contents($url, false, $context);
	$json = json_decode($result,true);
	$count = $json['metric_data']['metrics'][0]['timeslices'][0]['values'][$jsonKey];
	return $count;
}
?>

<?php

echo "New Relic Error And Little Bits<br>";

$appId = 90210; //new relic's application id

$relicKey = 'XXX'; // new relic's seacret key

$timePicker = 30; //time to measure error rate for (this is now - 30 minutes)

date_default_timezone_set('Asia/Jerusalem'); //set for your current timezone

$errorRate = getMetricFromRelic($relicKey, $appId, $timePicker);

function getMetricFromRelic($relicKey, $appId, $timePicker){

$errorURL = 'Errors/all&values[]=error_count';

$countURL = 'HttpDispatcher&values[]=call_count';

$otherTransactionsURL = 'OtherTransaction/all&values[]=call_count';

$errorKey = 'error_count';

$countKey = 'call_count';

$nowMinus30 = strtotime("-$timePicker minutes");

$startTimeDate = date('Y-m-d', $nowMinus30);

$startTimeMinutes = date('h:i:s', $nowMinus30);

$startTimeStr = "{$startTimeDate}T{$startTimeMinutes}+02:00";

$now = time();

$endTimeDate = date('Y-m-d', $now);

$endTimeMinutes = date('h:i:s', $now);

$endTimeStr = "{$endTimeDate}T{$endTimeMinutes}+02:00";

$errorCount = getMetrics($relicKey, $errorURL, $appId, $errorKey, $startTimeStr, $endTimeStr);

$callCount = getMetrics($relicKey, $countURL, $appId, $countKey, $startTimeStr, $endTimeStr);

$otherTransactionsCount = getMetrics($relicKey, $otherTransactionsURL, $appId, $countKey, $startTimeStr, $endTimeStr);

echo "Error Count: $errorCount<br>";

echo "Call Count: $callCount<br>";

$errorRate = 100 * $errorCount / ($callCount + $otherTransactionsCount);

echo "The error rate is: $errorRate<br>";

return $errorRate;

}

function getMetrics($relicKey, $url, $appId, $jsonKey, $start, $end){

$url = "https://api.newrelic.com/v2/applications/$appId/metrics/data.JSON?names[]=$url&from=$start&to=$end&summarize=true";

$opts = array(

'http'=>array(

'method'=>"GET",

'header'=>"X-Api-Key: $relicKey\r\n" .

"Accept: application/json\r\n"

)

);

$context = stream_context_create($opts);

$result = file_get_contents($url, false, $context);

$json = json_decode($result,true);

$count = $json['metric_data']['metrics'][0]['timeslices'][0]['values'][$jsonKey];

return $count;

}

Put it all together:

<?php
include 'cloudBit.php';
//send command to CloudBit example:
$cloudBitKey = 'YOUR-CLOUDBIT-KEY';
$deviceId = 'YOUR-CLOUDBIT-ID';
$durationInMillis = 6000; // max is 32000
$value = 99; //(this is the value sent to the bit 0-100)
sendToCloudBit($cloudBitKey, $deviceId, $durationInMillis, $value);

//send temp to cloudBit from Yahoo
include 'yahooWeather.php';
$city = "tel aviv";
$countryCode = "il";
$isFahrenheit = false;
$temp = getTemperatureFor($city, $countryCode, $isFahrenheit);
sendToCloudBit($cloudBitKey, $deviceId, $durationInMillis, $temp);

//get application error rate from relic to cloudbit
include 'newRelic.php';
$appId = 90210; //new relic's application id
$relicKey = 'XXX'; // new relic's secret key
$timePicker = 30; //time to measure error rate for (this is now - 30 minutes)
$errorRate = getMetricFromRelic($relicKey, $appId, $timePicker);
sendToCloudBit($cloudKitKey, $deviceId, $durationInMillis, $errorRate);
?>

<?php

include 'cloudBit.php';

//send command to CloudBit example:

$cloudBitKey = 'YOUR-CLOUDBIT-KEY';

$deviceId = 'YOUR-CLOUDBIT-ID';

$durationInMillis = 6000; // max is 32000

$value = 99; //(this is the value sent to the bit 0-100)

sendToCloudBit($cloudBitKey, $deviceId, $durationInMillis, $value);

//send temp to cloudBit from Yahoo

include 'yahooWeather.php';

$city = "tel aviv";

$countryCode = "il";

$isFahrenheit = false;

$temp = getTemperatureFor($city, $countryCode, $isFahrenheit);

sendToCloudBit($cloudBitKey, $deviceId, $durationInMillis, $temp);

//get application error rate from relic to cloudbit

include 'newRelic.php';

$appId = 90210; //new relic's application id

$relicKey = 'XXX'; // new relic's secret key

$timePicker = 30; //time to measure error rate for (this is now - 30 minutes)

$errorRate = getMetricFromRelic($relicKey, $appId, $timePicker);

sendToCloudBit($cloudKitKey, $deviceId, $durationInMillis, $errorRate);

3) using a cron job on the machine the PHP script will run every minute updating the display.

* * * * * /path/to/php /var/www/html/yourPHPscript.php

1	* * * * * /path/to/php /var/www/html/yourPHPscript.php

Done! now the cloudBit is displaying the current temperature in Tel-Aviv (Fahrenheit) or nimrodstech.com error rate from new relic. next step is to print some dashboard for this.