UDP Client: Support writing large reports

src/Jaeger/UDPClient.php

@@ -86,17 +86,19 @@ public function emitBatch(Batch $batch)
         $client = new AgentClient(null, $protocol);
 
         $client->emitBatch($batch);
-        $data = $buffer->getBuffer();
 
         try {
-            socket_sendto(
-                $socket,
-                $data,
-                strlen($data),
-                0,
-                $this->host,
-                $this->port
-            );
+            while ($buffer->available()) {
+                $data = $buffer->read(65507); // max size of DGRAM payload https://stackoverflow.com/a/38742429
+                socket_sendto(
+                    $socket,
+                    $data,
+                    strlen($data),
+                    ( $buffer->available() ) ? MSG_EOR : MSG_EOF,
+                    $this->host,
+                    $this->port
+                );
+            }
         } finally {
             socket_close($socket);
         }

tests/unit/Jaeger/UDPClientTest.php

@@ -93,7 +93,7 @@ public function testUsesSockets()
             $resource,
             Argument::type('string'),
             Argument::type('int'),
-            0,
+            512,
             '1.1.1.1',
             1234
         )->willReturn(123)->shouldBeCalledTimes(1);