[Translation][Loco] Make http requests synchronous when reading the Loco API

Author: Kocal

src/Symfony/Component/Translation/Bridge/Loco/LocoProvider.php

@@ -92,47 +92,37 @@ public function read(array $domains, array $locales): TranslatorBag
     {
         $domains = $domains ?: ['*'];
         $translatorBag = new TranslatorBag();
-        $responses = [];
 
         foreach ($locales as $locale) {
             foreach ($domains as $domain) {
-                $responses[] = [
-                    'response' => $this->client->request('GET', sprintf('export/locale/%s.xlf', rawurlencode($locale)), [
-                        'query' => [
-                            'filter' => $domain,
-                            'status' => 'translated',
-                        ],
-                    ]),
-                    'locale' => $locale,
-                    'domain' => $domain,
-                ];
-            }
-        }
-
-        foreach ($responses as $response) {
-            $locale = $response['locale'];
-            $domain = $response['domain'];
-            $response = $response['response'];
+                // Loco forbids concurrent requests, so the requests must be synchronous in order to prevent "429 Too Many Requests" errors.
+                $response = $this->client->request('GET', sprintf('export/locale/%s.xlf', rawurlencode($locale)), [
+                    'query' => [
+                        'filter' => $domain,
+                        'status' => 'translated',
+                    ],
+                ]);
+
+                if (404 === $response->getStatusCode()) {
+                    $this->logger->warning(sprintf('Locale "%s" for domain "%s" does not exist in Loco.', $locale, $domain));
+                    continue;
+                }
 
-            if (404 === $response->getStatusCode()) {
-                $this->logger->warning(sprintf('Locale "%s" for domain "%s" does not exist in Loco.', $locale, $domain));
-                continue;
-            }
+                $responseContent = $response->getContent(false);
 
-            $responseContent = $response->getContent(false);
+                if (200 !== $response->getStatusCode()) {
+                    throw new ProviderException('Unable to read the Loco response: '.$responseContent, $response);
+                }
 
-            if (200 !== $response->getStatusCode()) {
-                throw new ProviderException('Unable to read the Loco response: '.$responseContent, $response);
-            }
+                $locoCatalogue = $this->loader->load($responseContent, $locale, $domain);
+                $catalogue = new MessageCatalogue($locale);
 
-            $locoCatalogue = $this->loader->load($responseContent, $locale, $domain);
-            $catalogue = new MessageCatalogue($locale);
+                foreach ($locoCatalogue->all($domain) as $key => $message) {
+                    $catalogue->set($this->retrieveKeyFromId($key, $domain), $message, $domain);
+                }
 
-            foreach ($locoCatalogue->all($domain) as $key => $message) {
-                $catalogue->set($this->retrieveKeyFromId($key, $domain), $message, $domain);
+                $translatorBag->addCatalogue($catalogue);
             }
-
-            $translatorBag->addCatalogue($catalogue);
         }
 
         return $translatorBag;