#18905

Committed 17 Nov 2023 11:10PM UTC coverage: 88.211%. Remained the same

Build # #18905

Build Type

push

github

Committed by

web-flow

Commit Message

netty: Add option to limit RST_STREAM rate

The behavior purposefully mirrors that of Netty's
AbstractHttp2ConnectionHandlerBuilder.decoderEnforceMaxRstFramesPerWindow().
That API is not available to our code as we extend the
Http2ConnectionHandler, but we want our API to be able to delegate to
Netty's in the future if that ever becomes possible.

Run Details

30365 of 34423 relevant lines covered (88.21%)

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93.86

/../okhttp/src/main/java/io/grpc/okhttp/OkHttpClientTransport.java

/*
 * Copyright 2014 The gRPC Authors
 *
 * Licensed 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 io.grpc.okhttp;

import static com.google.common.base.Preconditions.checkState;
import static io.grpc.okhttp.Utils.DEFAULT_WINDOW_SIZE;
import static io.grpc.okhttp.Utils.DEFAULT_WINDOW_UPDATE_RATIO;

import com.google.common.annotations.VisibleForTesting;
import com.google.common.base.MoreObjects;
import com.google.common.base.Preconditions;
import com.google.common.base.Stopwatch;
import com.google.common.base.Supplier;
import com.google.common.util.concurrent.ListenableFuture;
import com.google.common.util.concurrent.SettableFuture;
import io.grpc.Attributes;
import io.grpc.CallOptions;
import io.grpc.ClientStreamTracer;
import io.grpc.Grpc;
import io.grpc.HttpConnectProxiedSocketAddress;
import io.grpc.InternalChannelz;
import io.grpc.InternalChannelz.SocketStats;
import io.grpc.InternalLogId;
import io.grpc.Metadata;
import io.grpc.MethodDescriptor;
import io.grpc.MethodDescriptor.MethodType;
import io.grpc.SecurityLevel;
import io.grpc.Status;
import io.grpc.Status.Code;
import io.grpc.StatusException;
import io.grpc.internal.ClientStreamListener.RpcProgress;
import io.grpc.internal.ConnectionClientTransport;
import io.grpc.internal.GrpcAttributes;
import io.grpc.internal.GrpcUtil;
import io.grpc.internal.Http2Ping;
import io.grpc.internal.InUseStateAggregator;
import io.grpc.internal.KeepAliveManager;
import io.grpc.internal.KeepAliveManager.ClientKeepAlivePinger;
import io.grpc.internal.SerializingExecutor;
import io.grpc.internal.StatsTraceContext;
import io.grpc.internal.TransportTracer;
import io.grpc.okhttp.ExceptionHandlingFrameWriter.TransportExceptionHandler;
import io.grpc.okhttp.internal.ConnectionSpec;
import io.grpc.okhttp.internal.Credentials;
import io.grpc.okhttp.internal.StatusLine;
import io.grpc.okhttp.internal.framed.ErrorCode;
import io.grpc.okhttp.internal.framed.FrameReader;
import io.grpc.okhttp.internal.framed.FrameWriter;
import io.grpc.okhttp.internal.framed.Header;
import io.grpc.okhttp.internal.framed.HeadersMode;
import io.grpc.okhttp.internal.framed.Http2;
import io.grpc.okhttp.internal.framed.Settings;
import io.grpc.okhttp.internal.framed.Variant;
import io.grpc.okhttp.internal.proxy.HttpUrl;
import io.grpc.okhttp.internal.proxy.Request;
import io.perfmark.PerfMark;
import java.io.EOFException;
import java.io.IOException;
import java.net.InetSocketAddress;
import java.net.Socket;
import java.net.URI;
import java.util.Collections;
import java.util.Deque;
import java.util.EnumMap;
import java.util.HashMap;
import java.util.Iterator;
import java.util.LinkedList;
import java.util.List;
import java.util.Locale;
import java.util.Map;
import java.util.Random;
import java.util.concurrent.CountDownLatch;
import java.util.concurrent.Executor;
import java.util.concurrent.ScheduledExecutorService;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.annotation.Nullable;
import javax.annotation.concurrent.GuardedBy;
import javax.net.SocketFactory;
import javax.net.ssl.HostnameVerifier;
import javax.net.ssl.SSLSession;
import javax.net.ssl.SSLSocket;
import javax.net.ssl.SSLSocketFactory;
import okio.Buffer;
import okio.BufferedSink;
import okio.BufferedSource;
import okio.ByteString;
import okio.Okio;
import okio.Source;
import okio.Timeout;

/**
 * A okhttp-based {@link ConnectionClientTransport} implementation.
 */
class OkHttpClientTransport implements ConnectionClientTransport, TransportExceptionHandler,
      OutboundFlowController.Transport {
  private static final Map<ErrorCode, Status> ERROR_CODE_TO_STATUS = buildErrorCodeToStatusMap();
  private static final Logger log = Logger.getLogger(OkHttpClientTransport.class.getName());

  private static Map<ErrorCode, Status> buildErrorCodeToStatusMap() {
    Map<ErrorCode, Status> errorToStatus = new EnumMap<>(ErrorCode.class);
    errorToStatus.put(ErrorCode.NO_ERROR,
        Status.INTERNAL.withDescription("No error: A GRPC status of OK should have been sent"));
    errorToStatus.put(ErrorCode.PROTOCOL_ERROR,
        Status.INTERNAL.withDescription("Protocol error"));
    errorToStatus.put(ErrorCode.INTERNAL_ERROR,
        Status.INTERNAL.withDescription("Internal error"));
    errorToStatus.put(ErrorCode.FLOW_CONTROL_ERROR,
        Status.INTERNAL.withDescription("Flow control error"));
    errorToStatus.put(ErrorCode.STREAM_CLOSED,
        Status.INTERNAL.withDescription("Stream closed"));
    errorToStatus.put(ErrorCode.FRAME_TOO_LARGE,
        Status.INTERNAL.withDescription("Frame too large"));
    errorToStatus.put(ErrorCode.REFUSED_STREAM,
        Status.UNAVAILABLE.withDescription("Refused stream"));
    errorToStatus.put(ErrorCode.CANCEL,
        Status.CANCELLED.withDescription("Cancelled"));
    errorToStatus.put(ErrorCode.COMPRESSION_ERROR,
        Status.INTERNAL.withDescription("Compression error"));
    errorToStatus.put(ErrorCode.CONNECT_ERROR,
        Status.INTERNAL.withDescription("Connect error"));
    errorToStatus.put(ErrorCode.ENHANCE_YOUR_CALM,
        Status.RESOURCE_EXHAUSTED.withDescription("Enhance your calm"));
    errorToStatus.put(ErrorCode.INADEQUATE_SECURITY,
        Status.PERMISSION_DENIED.withDescription("Inadequate security"));
    return Collections.unmodifiableMap(errorToStatus);
  }

  private final InetSocketAddress address;
  private final String defaultAuthority;
  private final String userAgent;
  private final Random random = new Random();
  // Returns new unstarted stopwatches
  private final Supplier<Stopwatch> stopwatchFactory;
  private final int initialWindowSize;
  private final Variant variant;
  private Listener listener;
  @GuardedBy("lock")
  private ExceptionHandlingFrameWriter frameWriter;
  private OutboundFlowController outboundFlow;
  private final Object lock = new Object();
  private final InternalLogId logId;
  @GuardedBy("lock")
  private int nextStreamId;
  @GuardedBy("lock")
  private final Map<Integer, OkHttpClientStream> streams = new HashMap<>();
  private final Executor executor;
  // Wrap on executor, to guarantee some operations be executed serially.
  private final SerializingExecutor serializingExecutor;
  private final ScheduledExecutorService scheduler;
  private final int maxMessageSize;
  private int connectionUnacknowledgedBytesRead;
  private ClientFrameHandler clientFrameHandler;
  // Caution: Not synchronized, new value can only be safely read after the connection is complete.
  private Attributes attributes;
  /**
   * Indicates the transport is in go-away state: no new streams will be processed, but existing
   * streams may continue.
   */
  @GuardedBy("lock")
  private Status goAwayStatus;
  @GuardedBy("lock")
  private boolean goAwaySent;
  @GuardedBy("lock")
  private Http2Ping ping;
  @GuardedBy("lock")
  private boolean stopped;
  @GuardedBy("lock")
  private boolean hasStream;
  private final SocketFactory socketFactory;
  private SSLSocketFactory sslSocketFactory;
  private HostnameVerifier hostnameVerifier;
  private Socket socket;
  @GuardedBy("lock")
  private int maxConcurrentStreams = 0;
  @SuppressWarnings("JdkObsolete") // Usage is bursty; want low memory usage when empty
  @GuardedBy("lock")
  private final Deque<OkHttpClientStream> pendingStreams = new LinkedList<>();
  private final ConnectionSpec connectionSpec;
  private KeepAliveManager keepAliveManager;
  private boolean enableKeepAlive;
  private long keepAliveTimeNanos;
  private long keepAliveTimeoutNanos;
  private boolean keepAliveWithoutCalls;
  private final Runnable tooManyPingsRunnable;
  private final int maxInboundMetadataSize;
  private final boolean useGetForSafeMethods;
  @GuardedBy("lock")
  private final TransportTracer transportTracer;
  @GuardedBy("lock")
  private final InUseStateAggregator<OkHttpClientStream> inUseState =
      new InUseStateAggregator<OkHttpClientStream>() {
        @Override
        protected void handleInUse() {
          listener.transportInUse(true);
        }

        @Override
        protected void handleNotInUse() {
          listener.transportInUse(false);
        }
      };
  @GuardedBy("lock")
  private InternalChannelz.Security securityInfo;

  @VisibleForTesting
  @Nullable
  final HttpConnectProxiedSocketAddress proxiedAddr;

  @VisibleForTesting
  int proxySocketTimeout = 30000;

  // The following fields should only be used for test.
  Runnable connectingCallback;
  SettableFuture<Void> connectedFuture;

  public OkHttpClientTransport(
      OkHttpChannelBuilder.OkHttpTransportFactory transportFactory,
      InetSocketAddress address,
      String authority,
      @Nullable String userAgent,
      Attributes eagAttrs,
      @Nullable HttpConnectProxiedSocketAddress proxiedAddr,
      Runnable tooManyPingsRunnable) {
    this(
        transportFactory,
        address,
        authority,
        userAgent,
        eagAttrs,
        GrpcUtil.STOPWATCH_SUPPLIER,
        new Http2(),
        proxiedAddr,
        tooManyPingsRunnable);
  }

  private OkHttpClientTransport(
      OkHttpChannelBuilder.OkHttpTransportFactory transportFactory,
      InetSocketAddress address,
      String authority,
      @Nullable String userAgent,
      Attributes eagAttrs,
      Supplier<Stopwatch> stopwatchFactory,
      Variant variant,
      @Nullable HttpConnectProxiedSocketAddress proxiedAddr,
      Runnable tooManyPingsRunnable) {
    this.address = Preconditions.checkNotNull(address, "address");
    this.defaultAuthority = authority;
    this.maxMessageSize = transportFactory.maxMessageSize;
    this.initialWindowSize = transportFactory.flowControlWindow;
    this.executor = Preconditions.checkNotNull(transportFactory.executor, "executor");
    serializingExecutor = new SerializingExecutor(transportFactory.executor);
    this.scheduler = Preconditions.checkNotNull(
        transportFactory.scheduledExecutorService, "scheduledExecutorService");
    // Client initiated streams are odd, server initiated ones are even. Server should not need to
    // use it. We start clients at 3 to avoid conflicting with HTTP negotiation.
    nextStreamId = 3;
    this.socketFactory = transportFactory.socketFactory == null
        ? SocketFactory.getDefault() : transportFactory.socketFactory;
    this.sslSocketFactory = transportFactory.sslSocketFactory;
    this.hostnameVerifier = transportFactory.hostnameVerifier;
    this.connectionSpec = Preconditions.checkNotNull(
        transportFactory.connectionSpec, "connectionSpec");
    this.stopwatchFactory = Preconditions.checkNotNull(stopwatchFactory, "stopwatchFactory");
    this.variant = Preconditions.checkNotNull(variant, "variant");
    this.userAgent = GrpcUtil.getGrpcUserAgent("okhttp", userAgent);
    this.proxiedAddr = proxiedAddr;
    this.tooManyPingsRunnable =
        Preconditions.checkNotNull(tooManyPingsRunnable, "tooManyPingsRunnable");
    this.maxInboundMetadataSize = transportFactory.maxInboundMetadataSize;
    this.transportTracer = transportFactory.transportTracerFactory.create();
    this.logId = InternalLogId.allocate(getClass(), address.toString());
    this.attributes = Attributes.newBuilder()
        .set(GrpcAttributes.ATTR_CLIENT_EAG_ATTRS, eagAttrs).build();
    this.useGetForSafeMethods = transportFactory.useGetForSafeMethods;
    initTransportTracer();
  }

  /**
   * Create a transport connected to a fake peer for test.
   */
  @VisibleForTesting
  OkHttpClientTransport(
      OkHttpChannelBuilder.OkHttpTransportFactory transportFactory,
      String userAgent,
      Supplier<Stopwatch> stopwatchFactory,
      Variant variant,
      @Nullable Runnable connectingCallback,
      SettableFuture<Void> connectedFuture,
      Runnable tooManyPingsRunnable) {
    this(
        transportFactory,
        new InetSocketAddress("127.0.0.1", 80),
        "notarealauthority:80",
        userAgent,
        Attributes.EMPTY,
        stopwatchFactory,
        variant,
        null,
        tooManyPingsRunnable);
    this.connectingCallback = connectingCallback;
    this.connectedFuture = Preconditions.checkNotNull(connectedFuture, "connectedFuture");
  }

  // sslSocketFactory is set to null when use plaintext.
  boolean isUsingPlaintext() {
    return sslSocketFactory == null;
  }

  private void initTransportTracer() {
    synchronized (lock) { // to make @GuardedBy linter happy
      transportTracer.setFlowControlWindowReader(new TransportTracer.FlowControlReader() {
        @Override
        public TransportTracer.FlowControlWindows read() {
          synchronized (lock) {
            long local = outboundFlow == null ? -1 : outboundFlow.windowUpdate(null, 0);
            // connectionUnacknowledgedBytesRead is only readable by ClientFrameHandler, so we
            // provide a lower bound.
            long remote = (long) (initialWindowSize * DEFAULT_WINDOW_UPDATE_RATIO);
            return new TransportTracer.FlowControlWindows(local, remote);
          }
        }
      });
    }
  }

  /**
   * Enable keepalive with custom delay and timeout.
   */
  void enableKeepAlive(boolean enable, long keepAliveTimeNanos,
      long keepAliveTimeoutNanos, boolean keepAliveWithoutCalls) {
    enableKeepAlive = enable;
    this.keepAliveTimeNanos = keepAliveTimeNanos;
    this.keepAliveTimeoutNanos = keepAliveTimeoutNanos;
    this.keepAliveWithoutCalls = keepAliveWithoutCalls;
  }

  @Override
  public void ping(final PingCallback callback, Executor executor) {
    long data = 0;
    Http2Ping p;
    boolean writePing;
    synchronized (lock) {
      checkState(frameWriter != null);
      if (stopped) {
        Http2Ping.notifyFailed(callback, executor, getPingFailure());
        return;
      }
      if (ping != null) {
        // we only allow one outstanding ping at a time, so just add the callback to
        // any outstanding operation
        p = ping;
        writePing = false;
      } else {
        // set outstanding operation and then write the ping after releasing lock
        data = random.nextLong();
        Stopwatch stopwatch = stopwatchFactory.get();
        stopwatch.start();
        p = ping = new Http2Ping(data, stopwatch);
        writePing = true;
        transportTracer.reportKeepAliveSent();
      }
      if (writePing) {
        frameWriter.ping(false, (int) (data >>> 32), (int) data);
      }
    }
    // If transport concurrently failed/stopped since we released the lock above, this could
    // immediately invoke callback (which we shouldn't do while holding a lock)
    p.addCallback(callback, executor);
  }

  @Override
  public OkHttpClientStream newStream(
      MethodDescriptor<?, ?> method, Metadata headers, CallOptions callOptions,
      ClientStreamTracer[] tracers) {
    Preconditions.checkNotNull(method, "method");
    Preconditions.checkNotNull(headers, "headers");
    StatsTraceContext statsTraceContext =
        StatsTraceContext.newClientContext(tracers, getAttributes(), headers);
    // FIXME: it is likely wrong to pass the transportTracer here as it'll exit the lock's scope
    synchronized (lock) { // to make @GuardedBy linter happy
      return new OkHttpClientStream(
          method,
          headers,
          frameWriter,
          OkHttpClientTransport.this,
          outboundFlow,
          lock,
          maxMessageSize,
          initialWindowSize,
          defaultAuthority,
          userAgent,
          statsTraceContext,
          transportTracer,
          callOptions,
          useGetForSafeMethods);
    }
  }

  @GuardedBy("lock")
  void streamReadyToStart(OkHttpClientStream clientStream) {
    if (goAwayStatus != null) {
      clientStream.transportState().transportReportStatus(
          goAwayStatus, RpcProgress.MISCARRIED, true, new Metadata());
    } else if (streams.size() >= maxConcurrentStreams) {
      pendingStreams.add(clientStream);
      setInUse(clientStream);
    } else {
      startStream(clientStream);
    }
  }

  @SuppressWarnings("GuardedBy")
  @GuardedBy("lock")
  private void startStream(OkHttpClientStream stream) {
    Preconditions.checkState(
        stream.transportState().id() == OkHttpClientStream.ABSENT_ID, "StreamId already assigned");
    streams.put(nextStreamId, stream);
    setInUse(stream);
    // TODO(b/145386688): This access should be guarded by 'stream.transportState().lock'; instead
    // found: 'this.lock'
    stream.transportState().start(nextStreamId);
    // For unary and server streaming, there will be a data frame soon, no need to flush the header.
    if ((stream.getType() != MethodType.UNARY && stream.getType() != MethodType.SERVER_STREAMING)
        || stream.useGet()) {
      frameWriter.flush();
    }
    if (nextStreamId >= Integer.MAX_VALUE - 2) {
      // Make sure nextStreamId greater than all used id, so that mayHaveCreatedStream() performs
      // correctly.
      nextStreamId = Integer.MAX_VALUE;
      startGoAway(Integer.MAX_VALUE, ErrorCode.NO_ERROR,
          Status.UNAVAILABLE.withDescription("Stream ids exhausted"));
    } else {
      nextStreamId += 2;
    }
  }

  /**
   * Starts pending streams, returns true if at least one pending stream is started.
   */
  @GuardedBy("lock")
  private boolean startPendingStreams() {
    boolean hasStreamStarted = false;
    while (!pendingStreams.isEmpty() && streams.size() < maxConcurrentStreams) {
      OkHttpClientStream stream = pendingStreams.poll();
      startStream(stream);
      hasStreamStarted = true;
    }
    return hasStreamStarted;
  }

  /**
   * Removes given pending stream, used when a pending stream is cancelled.
   */
  @GuardedBy("lock")
  void removePendingStream(OkHttpClientStream pendingStream) {
    pendingStreams.remove(pendingStream);
    maybeClearInUse(pendingStream);
  }

  @Override
  public Runnable start(Listener listener) {
    this.listener = Preconditions.checkNotNull(listener, "listener");

    if (enableKeepAlive) {
      keepAliveManager = new KeepAliveManager(
          new ClientKeepAlivePinger(this), scheduler, keepAliveTimeNanos, keepAliveTimeoutNanos,
          keepAliveWithoutCalls);
      keepAliveManager.onTransportStarted();
    }

    int maxQueuedControlFrames = 10000;
    final AsyncSink asyncSink = AsyncSink.sink(serializingExecutor, this, maxQueuedControlFrames);
    FrameWriter rawFrameWriter = asyncSink.limitControlFramesWriter(
        variant.newWriter(Okio.buffer(asyncSink), true));

    synchronized (lock) {
      // Handle FrameWriter exceptions centrally, since there are many callers. Note that errors
      // coming from rawFrameWriter are generally broken invariants/bugs, as AsyncSink does not
      // propagate syscall errors through the FrameWriter. But we handle the AsyncSink failures with
      // the same TransportExceptionHandler instance so it is all mixed back together.
      frameWriter = new ExceptionHandlingFrameWriter(this, rawFrameWriter);
      outboundFlow = new OutboundFlowController(this, frameWriter);
    }
    final CountDownLatch latch = new CountDownLatch(1);
    // Connecting in the serializingExecutor, so that some stream operations like synStream
    // will be executed after connected.
    serializingExecutor.execute(new Runnable() {
      @Override
      public void run() {
        // This is a hack to make sure the connection preface and initial settings to be sent out
        // without blocking the start. By doing this essentially prevents potential deadlock when
        // network is not available during startup while another thread holding lock to send the
        // initial preface.
        try {
          latch.await();
        } catch (InterruptedException e) {
          Thread.currentThread().interrupt();
        }
        // Use closed source on failure so that the reader immediately shuts down.
        BufferedSource source = Okio.buffer(new Source() {
          @Override
          public long read(Buffer sink, long byteCount) {
            return -1;
          }

          @Override
          public Timeout timeout() {
            return Timeout.NONE;
          }

          @Override
          public void close() {
          }
        });
        Socket sock;
        SSLSession sslSession = null;
        try {
          if (proxiedAddr == null) {
            sock = socketFactory.createSocket(address.getAddress(), address.getPort());
          } else {
            if (proxiedAddr.getProxyAddress() instanceof InetSocketAddress) {
              sock = createHttpProxySocket(
                  proxiedAddr.getTargetAddress(),
                  (InetSocketAddress) proxiedAddr.getProxyAddress(),
                  proxiedAddr.getUsername(),
                  proxiedAddr.getPassword()
              );
            } else {
              throw Status.INTERNAL.withDescription(
                  "Unsupported SocketAddress implementation "
                  + proxiedAddr.getProxyAddress().getClass()).asException();
            }
          }
          if (sslSocketFactory != null) {
            SSLSocket sslSocket = OkHttpTlsUpgrader.upgrade(
                sslSocketFactory, hostnameVerifier, sock, getOverridenHost(), getOverridenPort(),
                connectionSpec);
            sslSession = sslSocket.getSession();
            sock = sslSocket;
          }
          sock.setTcpNoDelay(true);
          source = Okio.buffer(Okio.source(sock));
          asyncSink.becomeConnected(Okio.sink(sock), sock);

          // The return value of OkHttpTlsUpgrader.upgrade is an SSLSocket that has this info
          attributes = attributes.toBuilder()
              .set(Grpc.TRANSPORT_ATTR_REMOTE_ADDR, sock.getRemoteSocketAddress())
              .set(Grpc.TRANSPORT_ATTR_LOCAL_ADDR, sock.getLocalSocketAddress())
              .set(Grpc.TRANSPORT_ATTR_SSL_SESSION, sslSession)
              .set(GrpcAttributes.ATTR_SECURITY_LEVEL,
                  sslSession == null ? SecurityLevel.NONE : SecurityLevel.PRIVACY_AND_INTEGRITY)
              .build();
        } catch (StatusException e) {
          startGoAway(0, ErrorCode.INTERNAL_ERROR, e.getStatus());
          return;
        } catch (Exception e) {
          onException(e);
          return;
        } finally {
          clientFrameHandler = new ClientFrameHandler(variant.newReader(source, true));
        }
        synchronized (lock) {
          socket = Preconditions.checkNotNull(sock, "socket");
          if (sslSession != null) {
            securityInfo = new InternalChannelz.Security(new InternalChannelz.Tls(sslSession));
          }
        }
      }
    });
    // Schedule to send connection preface & settings before any other write.
    try {
      sendConnectionPrefaceAndSettings();
    } finally {
      latch.countDown();
    }

    serializingExecutor.execute(new Runnable() {
      @Override
      public void run() {
        if (connectingCallback != null) {
          connectingCallback.run();
        }
        // ClientFrameHandler need to be started after connectionPreface / settings, otherwise it
        // may send goAway immediately.
        executor.execute(clientFrameHandler);
        synchronized (lock) {
          maxConcurrentStreams = Integer.MAX_VALUE;
          startPendingStreams();
        }
        if (connectedFuture != null) {
          connectedFuture.set(null);
        }
      }
    });
    return null;
  }

  /**
   * Should only be called once when the transport is first established.
   */
  private void sendConnectionPrefaceAndSettings() {
    synchronized (lock) {
      frameWriter.connectionPreface();
      Settings settings = new Settings();
      OkHttpSettingsUtil.set(settings, OkHttpSettingsUtil.INITIAL_WINDOW_SIZE, initialWindowSize);
      frameWriter.settings(settings);
      if (initialWindowSize > DEFAULT_WINDOW_SIZE) {
        frameWriter.windowUpdate(
                Utils.CONNECTION_STREAM_ID, initialWindowSize - DEFAULT_WINDOW_SIZE);
      }
    }
  }

  private Socket createHttpProxySocket(InetSocketAddress address, InetSocketAddress proxyAddress,
      String proxyUsername, String proxyPassword) throws StatusException {
    Socket sock = null;
    try {
      // The proxy address may not be resolved
      if (proxyAddress.getAddress() != null) {
        sock = socketFactory.createSocket(proxyAddress.getAddress(), proxyAddress.getPort());
      } else {
        sock =
            socketFactory.createSocket(proxyAddress.getHostName(), proxyAddress.getPort());
      }
      sock.setTcpNoDelay(true);
      // A socket timeout is needed because lost network connectivity while reading from the proxy,
      // can cause reading from the socket to hang.
      sock.setSoTimeout(proxySocketTimeout);

      Source source = Okio.source(sock);
      BufferedSink sink = Okio.buffer(Okio.sink(sock));

      // Prepare headers and request method line
      Request proxyRequest = createHttpProxyRequest(address, proxyUsername, proxyPassword);
      HttpUrl url = proxyRequest.httpUrl();
      String requestLine =
          String.format(Locale.US, "CONNECT %s:%d HTTP/1.1", url.host(), url.port());

      // Write request to socket
      sink.writeUtf8(requestLine).writeUtf8("\r\n");
      for (int i = 0, size = proxyRequest.headers().size(); i < size; i++) {
        sink.writeUtf8(proxyRequest.headers().name(i))
            .writeUtf8(": ")
            .writeUtf8(proxyRequest.headers().value(i))
            .writeUtf8("\r\n");
      }
      sink.writeUtf8("\r\n");
      // Flush buffer (flushes socket and sends request)
      sink.flush();

      // Read status line, check if 2xx was returned
      StatusLine statusLine = StatusLine.parse(readUtf8LineStrictUnbuffered(source));
      // Drain rest of headers
      while (!readUtf8LineStrictUnbuffered(source).equals("")) {}
      if (statusLine.code < 200 || statusLine.code >= 300) {
        Buffer body = new Buffer();
        try {
          sock.shutdownOutput();
          source.read(body, 1024);
        } catch (IOException ex) {
          body.writeUtf8("Unable to read body: " + ex.toString());
        }
        try {
          sock.close();
        } catch (IOException ignored) {
          // ignored
        }
        String message = String.format(
            Locale.US,
            "Response returned from proxy was not successful (expected 2xx, got %d %s). "
              + "Response body:\n%s",
            statusLine.code, statusLine.message, body.readUtf8());
        throw Status.UNAVAILABLE.withDescription(message).asException();
      }
      // As the socket will be used for RPCs from here on, we want the socket timeout back to zero.
      sock.setSoTimeout(0);
      return sock;
    } catch (IOException e) {
      if (sock != null) {
        GrpcUtil.closeQuietly(sock);
      }
      throw Status.UNAVAILABLE.withDescription("Failed trying to connect with proxy").withCause(e)
          .asException();
    }
  }

  private Request createHttpProxyRequest(InetSocketAddress address, String proxyUsername,
                                         String proxyPassword) {
    HttpUrl tunnelUrl = new HttpUrl.Builder()
        .scheme("https")
        .host(address.getHostName())
        .port(address.getPort())
        .build();

    Request.Builder request = new Request.Builder()
        .url(tunnelUrl)
        .header("Host", tunnelUrl.host() + ":" + tunnelUrl.port())
        .header("User-Agent", userAgent);

    // If we have proxy credentials, set them right away
    if (proxyUsername != null && proxyPassword != null) {
      request.header("Proxy-Authorization", Credentials.basic(proxyUsername, proxyPassword));
    }
    return request.build();
  }

  private static String readUtf8LineStrictUnbuffered(Source source) throws IOException {
    Buffer buffer = new Buffer();
    while (true) {
      if (source.read(buffer, 1) == -1) {
        throw new EOFException("\\n not found: " + buffer.readByteString().hex());
      }
      if (buffer.getByte(buffer.size() - 1) == '\n') {
        return buffer.readUtf8LineStrict();
      }
    }
  }

  @Override
  public String toString() {
    return MoreObjects.toStringHelper(this)
        .add("logId", logId.getId())
        .add("address", address)
        .toString();
  }

  @Override
  public InternalLogId getLogId() {
    return logId;
  }

  /**
   * Gets the overridden authority hostname.  If the authority is overridden to be an invalid
   * authority, uri.getHost() will (rightly) return null, since the authority is no longer
   * an actual service.  This method overrides the behavior for practical reasons.  For example,
   * if an authority is in the form "invalid_authority" (note the "_"), rather than return null,
   * we return the input.  This is because the return value, in conjunction with getOverridenPort,
   * are used by the SSL library to reconstruct the actual authority.  It /already/ has a
   * connection to the port, independent of this function.
   *
   * <p>Note: if the defaultAuthority has a port number in it and is also bad, this code will do
   * the wrong thing.  An example wrong behavior would be "invalid_host:443".   Registry based
   * authorities do not have ports, so this is even more wrong than before.  Sorry.
   */
  @VisibleForTesting
  String getOverridenHost() {
    URI uri = GrpcUtil.authorityToUri(defaultAuthority);
    if (uri.getHost() != null) {
      return uri.getHost();
    }

    return defaultAuthority;
  }

  @VisibleForTesting
  int getOverridenPort() {
    URI uri = GrpcUtil.authorityToUri(defaultAuthority);
    if (uri.getPort() != -1) {
      return uri.getPort();
    }

    return address.getPort();
  }

  @Override
  public void shutdown(Status reason) {
    synchronized (lock) {
      if (goAwayStatus != null) {
        return;
      }

      goAwayStatus = reason;
      listener.transportShutdown(goAwayStatus);
      stopIfNecessary();
    }
  }

  @Override
  public void shutdownNow(Status reason) {
    shutdown(reason);
    synchronized (lock) {
      Iterator<Map.Entry<Integer, OkHttpClientStream>> it = streams.entrySet().iterator();
      while (it.hasNext()) {
        Map.Entry<Integer, OkHttpClientStream> entry = it.next();
        it.remove();
        entry.getValue().transportState().transportReportStatus(reason, false, new Metadata());
        maybeClearInUse(entry.getValue());
      }

      for (OkHttpClientStream stream : pendingStreams) {
        // in cases such as the connection fails to ACK keep-alive, pending streams should have a
        // chance to retry and be routed to another connection.
        stream.transportState().transportReportStatus(
            reason, RpcProgress.MISCARRIED, true, new Metadata());
        maybeClearInUse(stream);
      }
      pendingStreams.clear();

      stopIfNecessary();
    }
  }

  @Override
  public Attributes getAttributes() {
    return attributes;
  }

  /**
   * Gets all active streams as an array.
   */
  @Override
  public OutboundFlowController.StreamState[] getActiveStreams() {
    synchronized (lock) {
      OutboundFlowController.StreamState[] flowStreams =
          new OutboundFlowController.StreamState[streams.size()];
      int i = 0;
      for (OkHttpClientStream stream : streams.values()) {
        flowStreams[i++] = stream.transportState().getOutboundFlowState();
      }
      return flowStreams;
    }
  }

  @VisibleForTesting
  ClientFrameHandler getHandler() {
    return clientFrameHandler;
  }

  @VisibleForTesting
  SocketFactory getSocketFactory() {
    return socketFactory;
  }

  @VisibleForTesting
  int getPendingStreamSize() {
    synchronized (lock) {
      return pendingStreams.size();
    }
  }

  @VisibleForTesting
  void setNextStreamId(int nextStreamId) {
    synchronized (lock) {
      this.nextStreamId = nextStreamId;
    }
  }

  /**
   * Finish all active streams due to an IOException, then close the transport.
   */
  @Override
  public void onException(Throwable failureCause) {
    Preconditions.checkNotNull(failureCause, "failureCause");
    Status status = Status.UNAVAILABLE.withCause(failureCause);
    startGoAway(0, ErrorCode.INTERNAL_ERROR, status);
  }

  /**
   * Send GOAWAY to the server, then finish all active streams and close the transport.
   */
  private void onError(ErrorCode errorCode, String moreDetail) {
    startGoAway(0, errorCode, toGrpcStatus(errorCode).augmentDescription(moreDetail));
  }

  private void startGoAway(int lastKnownStreamId, ErrorCode errorCode, Status status) {
    synchronized (lock) {
      if (goAwayStatus == null) {
        goAwayStatus = status;
        listener.transportShutdown(status);
      }
      if (errorCode != null && !goAwaySent) {
        // Send GOAWAY with lastGoodStreamId of 0, since we don't expect any server-initiated
        // streams. The GOAWAY is part of graceful shutdown.
        goAwaySent = true;
        frameWriter.goAway(0, errorCode, new byte[0]);
      }

      Iterator<Map.Entry<Integer, OkHttpClientStream>> it = streams.entrySet().iterator();
      while (it.hasNext()) {
        Map.Entry<Integer, OkHttpClientStream> entry = it.next();
        if (entry.getKey() > lastKnownStreamId) {
          it.remove();
          entry.getValue().transportState().transportReportStatus(
              status, RpcProgress.REFUSED, false, new Metadata());
          maybeClearInUse(entry.getValue());
        }
      }

      for (OkHttpClientStream stream : pendingStreams) {
        stream.transportState().transportReportStatus(
            status, RpcProgress.MISCARRIED, true, new Metadata());
        maybeClearInUse(stream);
      }
      pendingStreams.clear();

      stopIfNecessary();
    }
  }

  /**
   * Called when a stream is closed. We do things like:
   * <ul>
   * <li>Removing the stream from the map.
   * <li>Optionally reporting the status.
   * <li>Starting pending streams if we can.
   * <li>Stopping the transport if this is the last live stream under a go-away status.
   * </ul>
   *
   * @param streamId the Id of the stream.
   * @param status the final status of this stream, null means no need to report.
   * @param stopDelivery interrupt queued messages in the deframer
   * @param errorCode reset the stream with this ErrorCode if not null.
   * @param trailers the trailers received if not null
   */
  void finishStream(
      int streamId,
      @Nullable Status status,
      RpcProgress rpcProgress,
      boolean stopDelivery,
      @Nullable ErrorCode errorCode,
      @Nullable Metadata trailers) {
    synchronized (lock) {
      OkHttpClientStream stream = streams.remove(streamId);
      if (stream != null) {
        if (errorCode != null) {
          frameWriter.rstStream(streamId, ErrorCode.CANCEL);
        }
        if (status != null) {
          stream
              .transportState()
              .transportReportStatus(
                  status,
                  rpcProgress,
                  stopDelivery,
                  trailers != null ? trailers : new Metadata());
        }
        if (!startPendingStreams()) {
          stopIfNecessary();
          maybeClearInUse(stream);
        }
      }
    }
  }

  /**
   * When the transport is in goAway state, we should stop it once all active streams finish.
   */
  @GuardedBy("lock")
  private void stopIfNecessary() {
    if (!(goAwayStatus != null && streams.isEmpty() && pendingStreams.isEmpty())) {
      return;
    }
    if (stopped) {
      return;
    }
    stopped = true;

    if (keepAliveManager != null) {
      keepAliveManager.onTransportTermination();
    }

    if (ping != null) {
      ping.failed(getPingFailure());
      ping = null;
    }

    if (!goAwaySent) {
      // Send GOAWAY with lastGoodStreamId of 0, since we don't expect any server-initiated
      // streams. The GOAWAY is part of graceful shutdown.
      goAwaySent = true;
      frameWriter.goAway(0, ErrorCode.NO_ERROR, new byte[0]);
    }

    // We will close the underlying socket in the writing thread to break out the reader
    // thread, which will close the frameReader and notify the listener.
    frameWriter.close();
  }

  @GuardedBy("lock")
  private void maybeClearInUse(OkHttpClientStream stream) {
    if (hasStream) {
      if (pendingStreams.isEmpty() && streams.isEmpty()) {
        hasStream = false;
        if (keepAliveManager != null) {
          // We don't have any active streams. No need to do keepalives any more.
          // Again, we have to call this inside the lock to avoid the race between onTransportIdle
          // and onTransportActive.
          keepAliveManager.onTransportIdle();
        }
      }
    }
    if (stream.shouldBeCountedForInUse()) {
      inUseState.updateObjectInUse(stream, false);
    }
  }

  @GuardedBy("lock")
  private void setInUse(OkHttpClientStream stream) {
    if (!hasStream) {
      hasStream = true;
      if (keepAliveManager != null) {
        // We have a new stream. We might need to do keepalives now.
        // Note that we have to do this inside the lock to avoid calling
        // KeepAliveManager.onTransportActive and KeepAliveManager.onTransportIdle in the wrong
        // order.
        keepAliveManager.onTransportActive();
      }
    }
    if (stream.shouldBeCountedForInUse()) {
      inUseState.updateObjectInUse(stream, true);
    }
  }

  private Throwable getPingFailure() {
    synchronized (lock) {
      if (goAwayStatus != null) {
        return goAwayStatus.asException();
      } else {
        return Status.UNAVAILABLE.withDescription("Connection closed").asException();
      }
    }
  }

  boolean mayHaveCreatedStream(int streamId) {
    synchronized (lock) {
      return streamId < nextStreamId && (streamId & 1) == 1;
    }
  }

  OkHttpClientStream getStream(int streamId) {
    synchronized (lock) {
      return streams.get(streamId);
    }
  }

  /**
   * Returns a Grpc status corresponding to the given ErrorCode.
   */
  @VisibleForTesting
  static Status toGrpcStatus(ErrorCode code) {
    Status status = ERROR_CODE_TO_STATUS.get(code);
    return status != null ? status : Status.UNKNOWN.withDescription(
        "Unknown http2 error code: " + code.httpCode);
  }

  @Override
  public ListenableFuture<SocketStats> getStats() {
    SettableFuture<SocketStats> ret = SettableFuture.create();
    synchronized (lock) {
      if (socket == null) {
        ret.set(new SocketStats(
            transportTracer.getStats(),
            /*local=*/ null,
            /*remote=*/ null,
            new InternalChannelz.SocketOptions.Builder().build(),
            /*security=*/ null));
      } else {
        ret.set(new SocketStats(
            transportTracer.getStats(),
            socket.getLocalSocketAddress(),
            socket.getRemoteSocketAddress(),
            Utils.getSocketOptions(socket),
            securityInfo));
      }
      return ret;
    }
  }

  /**
   * Runnable which reads frames and dispatches them to in flight calls.
   */
  class ClientFrameHandler implements FrameReader.Handler, Runnable {

    private final OkHttpFrameLogger logger =
        new OkHttpFrameLogger(Level.FINE, OkHttpClientTransport.class);
    FrameReader frameReader;
    boolean firstSettings = true;

    ClientFrameHandler(FrameReader frameReader) {
      this.frameReader = frameReader;
    }

    @Override
    public void run() {
      String threadName = Thread.currentThread().getName();
      Thread.currentThread().setName("OkHttpClientTransport");
      try {
        // Read until the underlying socket closes.
        while (frameReader.nextFrame(this)) {
          if (keepAliveManager != null) {
            keepAliveManager.onDataReceived();
          }
        }
        // frameReader.nextFrame() returns false when the underlying read encounters an IOException,
        // it may be triggered by the socket closing, in such case, the startGoAway() will do
        // nothing, otherwise, we finish all streams since it's a real IO issue.
        Status status;
        synchronized (lock) {
          status = goAwayStatus;
        }
        if (status == null) {
          status = Status.UNAVAILABLE.withDescription("End of stream or IOException");
        }
        startGoAway(0, ErrorCode.INTERNAL_ERROR, status);
      } catch (Throwable t) {
        // TODO(madongfly): Send the exception message to the server.
        startGoAway(
            0,
            ErrorCode.PROTOCOL_ERROR,
            Status.INTERNAL.withDescription("error in frame handler").withCause(t));
      } finally {
        try {
          frameReader.close();
        } catch (IOException ex) {
          log.log(Level.INFO, "Exception closing frame reader", ex);
        }
        listener.transportTerminated();
        Thread.currentThread().setName(threadName);
      }
    }

    /**
     * Handle an HTTP2 DATA frame.
     */
    @SuppressWarnings("GuardedBy")
    @Override
    public void data(boolean inFinished, int streamId, BufferedSource in, int length,
                     int paddedLength)
        throws IOException {
      logger.logData(OkHttpFrameLogger.Direction.INBOUND,
          streamId, in.getBuffer(), length, inFinished);
      OkHttpClientStream stream = getStream(streamId);
      if (stream == null) {
        if (mayHaveCreatedStream(streamId)) {
          synchronized (lock) {
            frameWriter.rstStream(streamId, ErrorCode.STREAM_CLOSED);
          }
          in.skip(length);
        } else {
          onError(ErrorCode.PROTOCOL_ERROR, "Received data for unknown stream: " + streamId);
          return;
        }
      } else {
        // Wait until the frame is complete.
        in.require(length);

        Buffer buf = new Buffer();
        buf.write(in.getBuffer(), length);
        PerfMark.event("OkHttpClientTransport$ClientFrameHandler.data",
            stream.transportState().tag());
        synchronized (lock) {
          // TODO(b/145386688): This access should be guarded by 'stream.transportState().lock';
          // instead found: 'OkHttpClientTransport.this.lock'
          stream.transportState().transportDataReceived(buf, inFinished, paddedLength - length);
        }
      }

      // connection window update
      connectionUnacknowledgedBytesRead += paddedLength;
      if (connectionUnacknowledgedBytesRead >= initialWindowSize * DEFAULT_WINDOW_UPDATE_RATIO) {
        synchronized (lock) {
          frameWriter.windowUpdate(0, connectionUnacknowledgedBytesRead);
        }
        connectionUnacknowledgedBytesRead = 0;
      }
    }

    /**
     * Handle HTTP2 HEADER and CONTINUATION frames.
     */
    @SuppressWarnings("GuardedBy")
    @Override
    public void headers(boolean outFinished,
        boolean inFinished,
        int streamId,
        int associatedStreamId,
        List<Header> headerBlock,
        HeadersMode headersMode) {
      logger.logHeaders(OkHttpFrameLogger.Direction.INBOUND, streamId, headerBlock, inFinished);
      boolean unknownStream = false;
      Status failedStatus = null;
      if (maxInboundMetadataSize != Integer.MAX_VALUE) {
        int metadataSize = headerBlockSize(headerBlock);
        if (metadataSize > maxInboundMetadataSize) {
          failedStatus = Status.RESOURCE_EXHAUSTED.withDescription(
              String.format(
                  Locale.US,
                  "Response %s metadata larger than %d: %d",
                  inFinished ? "trailer" : "header",
                  maxInboundMetadataSize,
                  metadataSize));
        }
      }
      synchronized (lock) {
        OkHttpClientStream stream = streams.get(streamId);
        if (stream == null) {
          if (mayHaveCreatedStream(streamId)) {
            frameWriter.rstStream(streamId, ErrorCode.STREAM_CLOSED);
          } else {
            unknownStream = true;
          }
        } else {
          if (failedStatus == null) {
            PerfMark.event("OkHttpClientTransport$ClientFrameHandler.headers",
                stream.transportState().tag());
            // TODO(b/145386688): This access should be guarded by 'stream.transportState().lock';
            // instead found: 'OkHttpClientTransport.this.lock'
            stream.transportState().transportHeadersReceived(headerBlock, inFinished);
          } else {
            if (!inFinished) {
              frameWriter.rstStream(streamId, ErrorCode.CANCEL);
            }
            stream.transportState().transportReportStatus(failedStatus, false, new Metadata());
          }
        }
      }
      if (unknownStream) {
        // We don't expect any server-initiated streams.
        onError(ErrorCode.PROTOCOL_ERROR, "Received header for unknown stream: " + streamId);
      }
    }

    private int headerBlockSize(List<Header> headerBlock) {
      // Calculate as defined for SETTINGS_MAX_HEADER_LIST_SIZE in RFC 7540 §6.5.2.
      long size = 0;
      for (int i = 0; i < headerBlock.size(); i++) {
        Header header = headerBlock.get(i);
        size += 32 + header.name.size() + header.value.size();
      }
      size = Math.min(size, Integer.MAX_VALUE);
      return (int) size;
    }

    @Override
    public void rstStream(int streamId, ErrorCode errorCode) {
      logger.logRstStream(OkHttpFrameLogger.Direction.INBOUND, streamId, errorCode);
      Status status = toGrpcStatus(errorCode).augmentDescription("Rst Stream");
      boolean stopDelivery =
          (status.getCode() == Code.CANCELLED || status.getCode() == Code.DEADLINE_EXCEEDED);
      synchronized (lock) {
        OkHttpClientStream stream = streams.get(streamId);
        if (stream != null) {
          PerfMark.event("OkHttpClientTransport$ClientFrameHandler.rstStream",
              stream.transportState().tag());
          finishStream(
              streamId, status,
              errorCode == ErrorCode.REFUSED_STREAM ? RpcProgress.REFUSED : RpcProgress.PROCESSED,
              stopDelivery, null, null);
        }
      }
    }

    @Override
    public void settings(boolean clearPrevious, Settings settings) {
      logger.logSettings(OkHttpFrameLogger.Direction.INBOUND, settings);
      boolean outboundWindowSizeIncreased = false;
      synchronized (lock) {
        if (OkHttpSettingsUtil.isSet(settings, OkHttpSettingsUtil.MAX_CONCURRENT_STREAMS)) {
          int receivedMaxConcurrentStreams = OkHttpSettingsUtil.get(
              settings, OkHttpSettingsUtil.MAX_CONCURRENT_STREAMS);
          maxConcurrentStreams = receivedMaxConcurrentStreams;
        }

        if (OkHttpSettingsUtil.isSet(settings, OkHttpSettingsUtil.INITIAL_WINDOW_SIZE)) {
          int initialWindowSize = OkHttpSettingsUtil.get(
              settings, OkHttpSettingsUtil.INITIAL_WINDOW_SIZE);
          outboundWindowSizeIncreased = outboundFlow.initialOutboundWindowSize(initialWindowSize);
        }
        if (firstSettings) {
          listener.transportReady();
          firstSettings = false;
        }

        // The changed settings are not finalized until SETTINGS acknowledgment frame is sent. Any
        // writes due to update in settings must be sent after SETTINGS acknowledgment frame,
        // otherwise it will cause a stream error (RST_STREAM).
        frameWriter.ackSettings(settings);

        // send any pending bytes / streams
        if (outboundWindowSizeIncreased) {
          outboundFlow.writeStreams();
        }
        startPendingStreams();
      }
    }

    @Override
    public void ping(boolean ack, int payload1, int payload2) {
      long ackPayload = (((long) payload1) << 32) | (payload2 & 0xffffffffL);
      logger.logPing(OkHttpFrameLogger.Direction.INBOUND, ackPayload);
      if (!ack) {
        synchronized (lock) {
          frameWriter.ping(true, payload1, payload2);
        }
      } else {
        Http2Ping p = null;
        synchronized (lock) {
          if (ping != null) {
            if (ping.payload() == ackPayload) {
              p = ping;
              ping = null;
            } else {
              log.log(Level.WARNING, String.format(
                  Locale.US, "Received unexpected ping ack. Expecting %d, got %d",
                  ping.payload(), ackPayload));
            }
          } else {
            log.warning("Received unexpected ping ack. No ping outstanding");
          }
        }
        // don't complete it while holding lock since callbacks could run immediately
        if (p != null) {
          p.complete();
        }
      }
    }

    @Override
    public void ackSettings() {
      // Do nothing currently.
    }

    @Override
    public void goAway(int lastGoodStreamId, ErrorCode errorCode, ByteString debugData) {
      logger.logGoAway(OkHttpFrameLogger.Direction.INBOUND, lastGoodStreamId, errorCode, debugData);
      if (errorCode == ErrorCode.ENHANCE_YOUR_CALM) {
        String data = debugData.utf8();
        log.log(Level.WARNING, String.format(
            "%s: Received GOAWAY with ENHANCE_YOUR_CALM. Debug data: %s", this, data));
        if ("too_many_pings".equals(data)) {
          tooManyPingsRunnable.run();
        }
      }
      Status status = GrpcUtil.Http2Error.statusForCode(errorCode.httpCode)
          .augmentDescription("Received Goaway");
      if (debugData.size() > 0) {
        // If a debug message was provided, use it.
        status = status.augmentDescription(debugData.utf8());
      }
      startGoAway(lastGoodStreamId, null, status);
    }

    @Override
    public void pushPromise(int streamId, int promisedStreamId, List<Header> requestHeaders)
        throws IOException {
      logger.logPushPromise(OkHttpFrameLogger.Direction.INBOUND,
          streamId, promisedStreamId, requestHeaders);
      // We don't accept server initiated stream.
      synchronized (lock) {
        frameWriter.rstStream(streamId, ErrorCode.PROTOCOL_ERROR);
      }
    }

    @Override
    public void windowUpdate(int streamId, long delta) {
      logger.logWindowsUpdate(OkHttpFrameLogger.Direction.INBOUND, streamId, delta);
      if (delta == 0) {
        String errorMsg = "Received 0 flow control window increment.";
        if (streamId == 0) {
          onError(ErrorCode.PROTOCOL_ERROR, errorMsg);
        } else {
          finishStream(
              streamId, Status.INTERNAL.withDescription(errorMsg), RpcProgress.PROCESSED, false,
              ErrorCode.PROTOCOL_ERROR, null);
        }
        return;
      }

      boolean unknownStream = false;
      synchronized (lock) {
        if (streamId == Utils.CONNECTION_STREAM_ID) {
          outboundFlow.windowUpdate(null, (int) delta);
          return;
        }

        OkHttpClientStream stream = streams.get(streamId);
        if (stream != null) {
          outboundFlow.windowUpdate(stream.transportState().getOutboundFlowState(), (int) delta);
        } else if (!mayHaveCreatedStream(streamId)) {
          unknownStream = true;
        }
      }
      if (unknownStream) {
        onError(ErrorCode.PROTOCOL_ERROR,
            "Received window_update for unknown stream: " + streamId);
      }
    }

    @Override
    public void priority(int streamId, int streamDependency, int weight, boolean exclusive) {
      // Ignore priority change.
      // TODO(madongfly): log
    }

    @Override
    public void alternateService(int streamId, String origin, ByteString protocol, String host,
        int port, long maxAge) {
      // TODO(madongfly): Deal with alternateService propagation
    }
  }
}

grpc / grpc-java / #18905

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