Created
November 14, 2019 16:09
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Example: Flow HTTP Component for Server-Sent Events
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| <?php | |
| declare(strict_types=1); | |
| namespace Some\Package\Http; | |
| use Neos\Flow\Http\Component\ComponentContext; | |
| use Neos\Flow\Http\Component\ComponentInterface; | |
| use Neos\Flow\Http\Helper\MediaTypeHelper; | |
| final class ServerSentComponent implements ComponentInterface | |
| { | |
| public function handle(ComponentContext $componentContext) | |
| { | |
| $request = $componentContext->getHttpRequest(); | |
| if ($request->getUri()->getPath() !== '/__ping') { | |
| return; | |
| } | |
| $contentType = MediaTypeHelper::negotiateMediaType($request->getHeader('Accept'), ['text/event-stream'], true); | |
| if ($contentType !== 'text/event-stream') { | |
| return; | |
| } | |
| header('Cache-Control: no-cache'); | |
| header('Content-Type: text/event-stream'); | |
| $i = 1; | |
| while (true) { | |
| echo "event: ping\n"; | |
| echo 'data: ' . $i ++; | |
| echo "\n\n"; | |
| ob_end_flush(); | |
| flush(); | |
| sleep(1); | |
| } | |
| } | |
| } |
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| Neos: | |
| Flow: | |
| http: | |
| chain: | |
| 'preprocess': | |
| chain: | |
| 'Some.Package:ServerSent': | |
| component: 'Some\Package\Http\ServerSentComponent' |
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| <!DOCTYPE html> | |
| <html lang="en"> | |
| <head> | |
| <meta charset="UTF-8"> | |
| <title>SSE Test</title> | |
| </head> | |
| <body> | |
| <script> | |
| const evtSource = new EventSource('/__ping'); | |
| evtSource.addEventListener('ping', function(event) { | |
| console.log(event); | |
| }); | |
| </script> | |
| </body> | |
| </html> |
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See https://developer.mozilla.org/en-US/docs/Web/API/Server-sent_events/Using_server-sent_events