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Fix HTTP/2 stream priority memory leak by dropping unused PriorityValue cache from AbstractH2StreamMultiplexer. #617

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Fix HTTP/2 stream priority memory leak by dropping unused PriorityValue cache from AbstractH2StreamMultiplexer. #617

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63 changes: 47 additions & 16 deletions ...ore5-h2/src/main/java/org/apache/hc/core5/http2/impl/nio/AbstractH2StreamMultiplexer.java
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Original file line number Diff line number Diff line change
Expand Up @@ -35,9 +35,7 @@
import java.util.Deque;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.Queue;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.ConcurrentLinkedDeque;
import java.util.concurrent.ConcurrentLinkedQueue;
import java.util.concurrent.atomic.AtomicInteger;
Expand Down Expand Up @@ -141,7 +139,6 @@ enum SettingsHandshake { READY, TRANSMITTED, ACKED }
private EndpointDetails endpointDetails;
private boolean goAwayReceived;

private final Map<Integer, PriorityValue> priorities = new ConcurrentHashMap<>();
private volatile boolean peerNoRfc7540Priorities;


Expand Down Expand Up @@ -1020,6 +1017,9 @@ private void consumeFrame(final RawFrame frame) throws HttpException, IOExceptio
throw new H2ConnectionException(H2Error.FRAME_SIZE_ERROR, "Invalid PRIORITY_UPDATE payload");
}
final int prioritizedId = payload.getInt() & 0x7fffffff;
if (prioritizedId == 0) {
throw new H2ConnectionException(H2Error.PROTOCOL_ERROR, "PRIORITY_UPDATE stream id is 0");
}
final int len = payload.remaining();
final String field;
if (len > 0) {
Expand All @@ -1029,9 +1029,13 @@ private void consumeFrame(final RawFrame frame) throws HttpException, IOExceptio
} else {
field = "";
}
final PriorityValue pv = PriorityParamsParser.parse(field).toValueWithDefaults();
priorities.put(prioritizedId, pv);
requestSessionOutput();
final PriorityValue pv = parsePriorityValue(field);
if (pv != null) {
final H2Stream prioritizedStream = streams.lookup(prioritizedId);
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@ok2c ok2c Feb 16, 2026

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@arturobernalg Why are we ignoring prioritizedId that produce no match? Should we at least reject ids that have never been seen?

if (prioritizedStream != null) {
prioritizedStream.setPriorityValue(pv);
}
}
}
break;
}
Expand Down Expand Up @@ -1106,7 +1110,7 @@ private void consumeHeaderFrame(final RawFrame frame, final H2Stream stream) thr
if (streamListener != null) {
streamListener.onHeaderInput(this, streamId, headers);
}
recordPriorityFromHeaders(streamId, headers);
recordPriorityFromHeaders(stream, headers);
stream.consumeHeader(headers, frame.isFlagSet(FrameFlag.END_STREAM));
} else {
continuation.copyPayload(payload);
Expand All @@ -1125,7 +1129,7 @@ private void consumeContinuationFrame(final RawFrame frame, final H2Stream strea
if (streamListener != null) {
streamListener.onHeaderInput(this, streamId, headers);
}
recordPriorityFromHeaders(streamId, headers);
recordPriorityFromHeaders(stream, headers);
if (continuation.type == FrameType.PUSH_PROMISE.getValue()) {
stream.consumePromise(headers);
} else {
Expand Down Expand Up @@ -1378,19 +1382,43 @@ H2Stream createStream(final H2StreamChannel channel, final H2StreamHandler strea
return stream;
}

private void recordPriorityFromHeaders(final int streamId, final List<? extends Header> headers) {
private void recordPriorityFromHeaders(final H2Stream stream, final List<? extends Header> headers) {
if (headers == null || headers.isEmpty()) {
return;
}
for (final Header h : headers) {
if (HttpHeaders.PRIORITY.equalsIgnoreCase(h.getName())) {
final PriorityValue pv = PriorityParamsParser.parse(h.getValue()).toValueWithDefaults();
priorities.put(streamId, pv);
final PriorityValue pv = parsePriorityValue(h);
if (pv != null) {
stream.setPriorityValue(pv);
}
break;
}
}
}

private PriorityValue parsePriorityValue(final Header header) {
if (header == null) {
return null;
}
try {
return PriorityParamsParser.parse(header).toValueWithDefaults();
} catch (final IllegalArgumentException ignore) {
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@ok2c ok2c Feb 16, 2026

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@arturobernalg Does the parser throw IllegalArgumentException, like, ever?

return null;
}
}

private PriorityValue parsePriorityValue(final String field) {
if (field == null) {
return null;
}
try {
return PriorityParamsParser.parse(field).toValueWithDefaults();
} catch (final IllegalArgumentException ignore) {
return null;
}
}

class H2StreamChannelImpl implements H2StreamChannel {

private final int id;
Expand Down Expand Up @@ -1438,18 +1466,21 @@ public void submit(final List<Header> headers, final boolean endStream) throws I
return;
}
ensureNotClosed();
if (peerNoRfc7540Priorities && streams.isSameSide(id)) {
if (peerNoRfc7540Priorities) {
for (final Header h : headers) {
if (HttpHeaders.PRIORITY.equalsIgnoreCase(h.getName())) {
final byte[] ascii = h.getValue() != null
? h.getValue().getBytes(StandardCharsets.US_ASCII)
: new byte[0];

final int sid = id & 0x7fffffff;
final ByteArrayBuffer b = new ByteArrayBuffer(4 + ascii.length);
b.append((byte) (id >> 24));
b.append((byte) (id >> 16));
b.append((byte) (id >> 8));
b.append((byte) id);
b.append((byte) (sid >> 24));
b.append((byte) (sid >> 16));
b.append((byte) (sid >> 8));
b.append((byte) sid);
b.append(ascii, 0, ascii.length);

final ByteBuffer pl = ByteBuffer.wrap(b.array(), 0, b.length());
final RawFrame priUpd = new RawFrame(FrameType.PRIORITY_UPDATE.getValue(), 0, 0, pl);
commitFrameInternal(priUpd);
Expand Down
14 changes: 12 additions & 2 deletions httpcore5-h2/src/main/java/org/apache/hc/core5/http2/impl/nio/H2Stream.java
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Original file line number Diff line number Diff line change
Expand Up @@ -45,6 +45,7 @@
import org.apache.hc.core5.http.nio.HandlerFactory;
import org.apache.hc.core5.http2.H2Error;
import org.apache.hc.core5.http2.H2StreamResetException;
import org.apache.hc.core5.http2.priority.PriorityValue;
import org.apache.hc.core5.util.Timeout;

class H2Stream implements StreamControl {
Expand All @@ -64,6 +65,7 @@ class H2Stream implements StreamControl {
private volatile long lastActivityNanos;

private volatile Timeout idleTimeout;
private volatile PriorityValue priorityValue;

H2Stream(final H2StreamChannel channel, final H2StreamHandler handler, final Consumer<State> stateChangeCallback) {
this.channel = channel;
Expand Down Expand Up @@ -313,7 +315,7 @@ public String toString() {
buf.append("[")
.append("id=").append(channel.getId())
.append(", reserved=").append(reserved)
.append(", removeClosed=").append(remoteClosed)
.append(", remoteClosed=").append(remoteClosed)
.append(", localClosed=").append(channel.isLocalClosed())
.append(", localReset=").append(channel.isLocalReset())
.append("]");
Expand All @@ -332,4 +334,12 @@ Timeout getIdleTimeout() {
return idleTimeout;
}

}
PriorityValue getPriorityValue() {
return priorityValue;
}

void setPriorityValue(final PriorityValue priorityValue) {
this.priorityValue = priorityValue;
}

}
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