/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.coyote.http2;
import java.io.IOException;
import org.junit.
Assert;
import org.junit.Test;
public class TestRfc9218
extends Http2TestBase {
@Test
public void testPriority()
throws Exception {
http2Connect();
/*
* This test uses small window updates and data frames that will trigger the excessive overhead protection so
* disable it.
*/
http2Protocol.setOverheadWindowUpdateThreshold(0);
http2Protocol.setOverheadDataThreshold(0);
// Default connection window size is 64k - 1. Initial request will have used 8k (56k -1). Increase it to 57k.
sendWindowUpdate(0, 1 + 1024);
// Consume 56k of the connection window
for (
int i = 3; i < 17; i += 2) {
sendSimpleGetRequest(i);
readSimpleGetResponse();
}
String trace = output.getTrace();
System.out.println(trace);
output.clearTrace();
// At this point the connection window should be 1k
// Process a request on stream 17. This should consume the connection window.
sendSimpleGetRequest(17);
// 17-headers, 17-1k-body
parser.readFrame();
parser.readFrame();
trace = output.getTrace();
System.out.println(trace);
output.clearTrace();
// Send additional requests. Connection window is empty so only headers will be returned.
sendSimpleGetRequest(19);
sendSimpleGetRequest(21);
// 19-headers, 21-headers
parser.readFrame();
parser.readFrame();
trace = output.getTrace();
System.out.println(trace);
output.clearTrace();
// At this point 17, 19 and 21 are all blocked because the connection window is zero.
// 17 - 7k body left
// 19 - 8k body left
// 21 - 8k body left
// Add 1k to the connection window. Should be used for stream 17.
sendWindowUpdate(0, 1024);
parser.readFrame();
Assert.assertEquals(
"17-Body-1024\n", output.getTrace());
output.clearTrace();
// 17 - 6k body left
// 19 - 8k body left
// 21 - 8k body left
// Re-order the priorities
sendPriorityUpdate(19, 2,
false);
sendPriorityUpdate(21, 1,
false);
// Add 1k to the connection window. Should be used for stream 21.
sendWindowUpdate(0, 1024);
parser.readFrame();
Assert.assertEquals(
"21-Body-1024\n", output.getTrace());
output.clearTrace();
// 17 - 6k body left
// 19 - 8k body left
// 21 - 7k body left
// Re-order the priorities
sendPriorityUpdate(17, 3,
true);
sendPriorityUpdate(19, 3,
true);
sendPriorityUpdate(21, 3,
true);
// Add 3k to the connection window. Should be split between 17, 19 and 21.
sendWindowUpdate(0, 1024 * 3);
parser.readFrame();
parser.readFrame();
parser.readFrame();
trace = output.getTrace();
Assert.assertTrue(trace.contains(
"17-Body-877\n"));
trace = trace.replace(
"17-Body-877\n",
"");
Assert.assertTrue(trace.contains(
"19-Body-1170\n"));
trace = trace.replace(
"19-Body-1170\n",
"");
Assert.assertTrue(trace.contains(
"21-Body-1024\n"));
trace = trace.replace(
"21-Body-1024\n",
"");
Assert.assertEquals(0, trace.length());
output.clearTrace();
// 1 byte unallocated in connection window
// 17 - 5267 body left
// 19 - 7022 body left
// 21 - 6144 body left
// Add 1 byte to the connection window. Due to rounding up, each stream should get 1 byte.
sendWindowUpdate(0, 1);
parser.readFrame();
parser.readFrame();
parser.readFrame();
trace = output.getTrace();
Assert.assertTrue(trace.contains(
"17-Body-1\n"));
trace = trace.replace(
"17-Body-1\n",
"");
Assert.assertTrue(trace.contains(
"19-Body-1\n"));
trace = trace.replace(
"19-Body-1\n",
"");
Assert.assertTrue(trace.contains(
"21-Body-1\n"));
trace = trace.replace(
"21-Body-1\n",
"");
Assert.assertEquals(0, trace.length());
output.clearTrace();
// 1 byte over allocated in connection window
// 17 - 5266 body left
// 19 - 7021 body left
// 21 - 6143 body left
// Re-order the priorities
sendPriorityUpdate(17, 2,
true);
/*
* Add 8k to the connection window. Should clear the connection window over allocation and fully allocate 17
* with the remainder split equally between 17 and 21.
*/
sendWindowUpdate(0, 1024 * 8);
// Use try/catch as third read has been failing on some tests runs
try {
parser.readFrame();
parser.readFrame();
parser.readFrame();
}
catch (IOException ioe) {
// Dump for debugging purposes
ioe.printStackTrace();
// Continue - we'll get trace dumped to stdout below
}
trace = output.getTrace();
System.out.println(trace);
Assert.assertTrue(trace.contains(
"17-Body-5266\n"));
trace = trace.replace(
"17-Body-5266\n",
"");
Assert.assertTrue(trace.contains(
"17-EndOfStream\n"));
trace = trace.replace(
"17-EndOfStream\n",
"");
Assert.assertTrue(trace.contains(
"19-Body-1560\n"));
trace = trace.replace(
"19-Body-1560\n",
"");
Assert.assertTrue(trace.contains(
"21-Body-1365\n"));
trace = trace.replace(
"21-Body-1365\n",
"");
Assert.assertEquals(0, trace.length());
// Test doesn't read the read of the body for streams 19 and 21.
}
}