Only compare header size vs. max allowed frame size if the latter is limited

Closes #407, references #362.
[#160628331]

Author: michaelklishin

src/main/java/com/rabbitmq/client/impl/AMQCommand.java

@@ -107,12 +107,12 @@ public void transmit(AMQChannel channel) throws IOException {
                 Frame headerFrame = this.assembler.getContentHeader().toFrame(channelNumber, body.length);
 
                 int frameMax = connection.getFrameMax();
-                int bodyPayloadMax = (frameMax == 0) ? body.length : frameMax
-                        - EMPTY_FRAME_SIZE;
+                boolean cappedFrameMax = frameMax > 0;
+                int bodyPayloadMax = cappedFrameMax ? frameMax - EMPTY_FRAME_SIZE : body.length;
 
-                if (headerFrame.size() > frameMax) {
-                    throw new IllegalArgumentException("Content headers exceeded max frame size: " +
-                            headerFrame.size() + " > " + frameMax);
+                if (cappedFrameMax && headerFrame.size() > frameMax) {
+                    String msg = String.format("Content headers exceeded max frame size: %d > %d", headerFrame.size(), frameMax);
+                    throw new IllegalArgumentException(msg);
                 }
                 connection.writeFrame(m.toFrame(channelNumber));
                 connection.writeFrame(headerFrame);

src/test/java/com/rabbitmq/client/test/functional/FrameMax.java

@@ -30,6 +30,7 @@
 import java.util.concurrent.ExecutorService;
 import java.util.concurrent.TimeoutException;
 
+import com.rabbitmq.client.impl.AMQBasicProperties;
 import com.rabbitmq.client.test.TestUtils;
 import org.junit.Test;
 
@@ -104,9 +105,10 @@ public FrameMax() {
         closeChannel();
         closeConnection();
         ConnectionFactory cf = new GenerousConnectionFactory();
+        cf.setRequestedFrameMax(8192);
         connection = cf.newConnection();
         openChannel();
-        basicPublishVolatile(new byte[connection.getFrameMax()], "void");
+        basicPublishVolatile(new byte[connection.getFrameMax() * 2], "void");
         expectError(AMQP.FRAME_ERROR);
     }
 
@@ -123,7 +125,9 @@ public FrameMax() {
 
         // create headers with zero-length value to calculate maximum header value size before exceeding frame_max
         headers.put(headerName, LongStringHelper.asLongString(new byte[0]));
-        AMQP.BasicProperties properties = new AMQP.BasicProperties.Builder().headers(headers).build();
+        AMQP.BasicProperties properties = new AMQP.BasicProperties.Builder()
+                                                  .headers(headers)
+                                                  .build();
         Frame minimalHeaderFrame = properties.toFrame(0, 0);
         int maxHeaderValueSize = FRAME_MAX - minimalHeaderFrame.size();
 
@@ -151,6 +155,33 @@ public FrameMax() {
     }
 
 
+    // see rabbitmq/rabbitmq-java-client#407
+    @Test public void unlimitedFrameMaxWithHeaders()
+            throws IOException, TimeoutException {
+        closeChannel();
+        closeConnection();
+        ConnectionFactory cf = newConnectionFactory();
+        cf.setRequestedFrameMax(0);
+        connection = cf.newConnection();
+        openChannel();
+
+        Map<String, Object> headers = new HashMap<String, Object>();
+        headers.put("h1", LongStringHelper.asLongString(new byte[250]));
+        headers.put("h1", LongStringHelper.asLongString(new byte[500]));
+        headers.put("h1", LongStringHelper.asLongString(new byte[750]));
+        headers.put("h1", LongStringHelper.asLongString(new byte[5000]));
+        headers.put("h1", LongStringHelper.asLongString(new byte[50000]));
+        AMQP.BasicProperties properties = new AMQP.BasicProperties.Builder()
+                                                  .headers(headers)
+                                                  .build();
+        basicPublishVolatile(new byte[500000], "", "", properties);
+    }
+
+    @Override
+    protected boolean isAutomaticRecoveryEnabled() {
+        return false;
+    }
+
     /* ConnectionFactory that uses MyFrameHandler rather than
      * SocketFrameHandler. */
     private static class MyConnectionFactory extends ConnectionFactory {