private FramedConnection(Builder builder) throws IOException {
protocol = builder.protocol;
pushObserver = builder.pushObserver;
client = builder.client;
listener = builder.listener;
// http://tools.ietf.org/html/draft-ietf-httpbis-http2-17#section-5.1.1
nextStreamId = builder.client ? 1 : 2;
if (builder.client && protocol == Protocol.HTTP_2) {
nextStreamId += 2; // In HTTP/2, 1 on client is reserved for Upgrade.
}
nextPingId = builder.client ? 1 : 2;
// Flow control was designed more for servers, or proxies than edge clients.
// If we are a client, set the flow control window to 16MiB. This avoids
// thrashing window updates every 64KiB, yet small enough to avoid blowing
// up the heap.
if (builder.client) {
okHttpSettings.set(Settings.INITIAL_WINDOW_SIZE, 0, OKHTTP_CLIENT_WINDOW_SIZE);
}
hostname = builder.hostname;
if (protocol == Protocol.HTTP_2) {
variant = new Http2();
// Like newSingleThreadExecutor, except lazy creates the thread.
pushExecutor =
new ThreadPoolExecutor(
0,
1,
60,
TimeUnit.SECONDS,
new LinkedBlockingQueue<Runnable>(),
Util.threadFactory(Util.format("OkHttp %s Push Observer", hostname), true));
// 1 less than SPDY http://tools.ietf.org/html/draft-ietf-httpbis-http2-17#section-6.9.2
peerSettings.set(Settings.INITIAL_WINDOW_SIZE, 0, 65535);
peerSettings.set(Settings.MAX_FRAME_SIZE, 0, Http2.INITIAL_MAX_FRAME_SIZE);
} else if (protocol == Protocol.SPDY_3) {
variant = new Spdy3();
pushExecutor = null;
} else {
throw new AssertionError(protocol);
}
bytesLeftInWriteWindow = peerSettings.getInitialWindowSize(DEFAULT_INITIAL_WINDOW_SIZE);
socket = builder.socket;
frameWriter = variant.newWriter(builder.sink, client);
readerRunnable = new Reader(variant.newReader(builder.source, client));
}
@Test
public void peerHttp2ClientDisablesPush() throws Exception {
boolean client = false; // Peer is client, so we are server.
Settings settings = new Settings();
settings.set(ENABLE_PUSH, 0, 0); // The peer client disables push.
FramedConnection connection = sendHttp2SettingsAndCheckForAck(client, settings);
// verify the peer's settings were read and applied.
assertFalse(connection.peerSettings.getEnablePush(true));
}
@Test
public void peerIncreasesMaxFrameSize() throws Exception {
int newMaxFrameSize = 0x4001;
Settings settings = new Settings();
settings.set(MAX_FRAME_SIZE, 0, newMaxFrameSize);
FramedConnection connection = sendHttp2SettingsAndCheckForAck(true, settings);
// verify the peer's settings were read and applied.
assertEquals(newMaxFrameSize, connection.peerSettings.getMaxFrameSize(-1));
assertEquals(newMaxFrameSize, connection.frameWriter.maxDataLength());
}
@Test
public void peerHttp2ServerLowersInitialWindowSize() throws Exception {
peer.setVariantAndClient(HTTP_2, false);
Settings initial = new Settings();
initial.set(INITIAL_WINDOW_SIZE, PERSIST_VALUE, 1684);
Settings shouldntImpactConnection = new Settings();
shouldntImpactConnection.set(INITIAL_WINDOW_SIZE, PERSIST_VALUE, 3368);
peer.sendFrame().settings(initial);
peer.acceptFrame(); // ACK
peer.sendFrame().settings(shouldntImpactConnection);
peer.acceptFrame(); // ACK 2
peer.acceptFrame(); // HEADERS
peer.play();
FramedConnection connection = connection(peer, HTTP_2);
// Default is 64KiB - 1.
assertEquals(65535, connection.peerSettings.getInitialWindowSize(-1));
// Verify the peer received the ACK.
MockSpdyPeer.InFrame ackFrame = peer.takeFrame();
assertEquals(TYPE_SETTINGS, ackFrame.type);
assertEquals(0, ackFrame.streamId);
assertTrue(ackFrame.ack);
ackFrame = peer.takeFrame();
assertEquals(TYPE_SETTINGS, ackFrame.type);
assertEquals(0, ackFrame.streamId);
assertTrue(ackFrame.ack);
// This stream was created *after* the connection settings were adjusted.
FramedStream stream = connection.newStream(headerEntries("a", "android"), false, true);
assertEquals(3368, connection.peerSettings.getInitialWindowSize(DEFAULT_INITIAL_WINDOW_SIZE));
assertEquals(1684, connection.bytesLeftInWriteWindow); // initial wasn't affected.
// New Stream is has the most recent initial window size.
assertEquals(3368, stream.bytesLeftInWriteWindow);
}
@Test
public void peerHttp2ServerZerosCompressionTable() throws Exception {
boolean client = false; // Peer is server, so we are client.
Settings settings = new Settings();
settings.set(HEADER_TABLE_SIZE, PERSIST_VALUE, 0);
FramedConnection connection = sendHttp2SettingsAndCheckForAck(client, settings);
// verify the peer's settings were read and applied.
assertEquals(0, connection.peerSettings.getHeaderTableSize());
Http2.Reader frameReader = (Http2.Reader) connection.readerRunnable.frameReader;
assertEquals(0, frameReader.hpackReader.maxDynamicTableByteCount());
// TODO: when supported, check the frameWriter's compression table is unaffected.
}