PHP waiting for response to change status - php

Question

I'm trying to implement SkyScanner API...
I need to call:
"http://partners.api.skyscanner.net/apiservices/pricing/uk1/v1.0/
{SessionKey}?apiKey={apiKey}
&pageIndex=0
&pageSize=10"
so I write:
$res1 = $client1->get('http://partners.api.skyscanner.net/apiservices/pricing/uk2/v1.0/'.$session_id.'?apikey=APIKEY&pageIndex=0&pageSize=10"');
$res1 = json_decode($res1->getBody()->getContents(), true);
$res1 = collect($res1);
and I need to wait for a response to change Status from UpdatePending to UpdateCompleted
API docs:
Keep requesting page 0 until you get UpdatesComplete with pageIndex=0
at half a second to one second interval. Once you get UpdatesComplete
you may request any page and page size.
While the status is UPDATESPENDING, you should request only page 0
because the contents of each page are liable to change until updates
are complete.
How to wait for response to change status...
I try:
while ($res1['Status'] == 'UpdatesPending') {
echo 'waiting';
}
dd($res1);
but there is no end ...
How to wait for a response to change status?

Answer 1

you can echo 'waiting' before youre code
then it is be compleate echo completed in the other line
echo 'waiting...';
$res1 = $client1->get('http://partners.api.skyscanner.net/apiservices/pricing/uk2/v1.0/'.$session_id.'?apikey=APIKEY&pageIndex=0&pageSize=10"');
$res1 = json_decode($res1->getBody()->getContents(), true);
$res1 = collect($res1);
echo 'completed';

Answer 2

You need to create a do/while loop to check the status and break out of it when the status changes:
do{
$res1 = $client1->get('http://partners.api.skyscanner.net/apiservices/pricing/uk2/v1.0/'.$session_id.'?apikey=APIKEY&pageIndex=0&pageSize=10"');
$res1 = json_decode($res1->getBody()->getContents(), true);
$res1 = collect($res1);
if($res1['Status'] == 'UpdatesPending') echo "waiting...<br />\n";
sleep(5); // Make it sleep 5 seconds so as to not spam the server
while($res1['Status'] == 'UpdatesPending');
echo "Done!";
Note that you won't get any actual feedback until the whole process has finished.

Answer 3

If you use guzzle as PHP HTTP Client, then you just need to define retry decider and retry timer
public function retryDecider()
{
return function ($retries, Request $request, Response $response = null, RequestException $exception = null)
{
// maximum retries is three times
if ($retries >= 3) {
return false;
}
if ($response) {
$content = $response->getBody()->getContents();
$res1 = json_decode($content, true);
$res1 = collect($res1);
// maybe you need to change this one to 'substr' or regex or something else
if ($res1['Status'] == 'UpdatesComplete') {
return false;
}
}
return true; // we will request again
};
}
public function retryDelay()
{
return function ($numberOfRetries) {
return 1000; // 1 second
};
}
and use that decider and delay function
$handlerStack = HandlerStack::create(new CurlHandler());
$handlerStack->push(Middleware::retry($this->retryDecider(), $this->retryDelay()));
$client = new Client(array('handler' => $handlerStack));
and get your response
$url = 'http://partners.api.skyscanner.net/apiservices/pricing/uk2/v1.0/'.$session_id.'?apikey=APIKEY&pageIndex=0&pageSize=10"';
$response = $client->request('GET', $url)->getBody()->getContents();
You can decode the last $response to decide want you want to do.
With this kind of approach, you can decide which response is valid and retry the request as many as you like.