Chunk DNS lookups as well

src/Commands/Issue.php

@@ -174,16 +174,24 @@ class Issue implements Command {
     }
 
     private function checkDnsRecords($domains) {
+        $errors = [];
+
+        $domainChunks = array_chunk($domains, 10, true);
+
+        foreach ($domainChunks as $domainChunk) {
             $promises = [];
 
-        foreach ($domains as $domain) {
+            foreach ($domainChunk as $domain) {
                 $promises[$domain] = \Amp\Dns\resolve($domain, [
                     "types" => [Record::A],
                     "hosts" => false,
                 ]);
             }
 
-        list($errors) = (yield \Amp\any($promises));
+            list($chunkErrors) = (yield \Amp\any($promises));
+
+            $errors += $chunkErrors;
+        }
 
         if (!empty($errors)) {
             throw new AcmeException("Couldn't resolve the following domains to an IPv4 record: " . implode(", ", array_keys($errors)));