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/*
* 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.checkNotNull;
import static com.google.common.base.Preconditions.checkState;
import static io.grpc.internal.ClientStreamListener.RpcProgress.PROCESSED;
import com.google.common.io.BaseEncoding;
import io.grpc.Attributes;
import io.grpc.Metadata;
import io.grpc.MethodDescriptor;
import io.grpc.Status;
import io.grpc.internal.AbstractClientStream;
import io.grpc.internal.Http2ClientStreamTransportState;
import io.grpc.internal.StatsTraceContext;
import io.grpc.internal.TransportTracer;
import io.grpc.internal.WritableBuffer;
import io.grpc.okhttp.internal.framed.ErrorCode;
import io.grpc.okhttp.internal.framed.Header;
import java.util.ArrayDeque;
import java.util.List;
import java.util.Queue;
import javax.annotation.concurrent.GuardedBy;
import okio.Buffer;
/**
* Client stream for the okhttp transport.
*/
class OkHttpClientStream extends AbstractClientStream {
private static final int WINDOW_UPDATE_THRESHOLD = Utils.DEFAULT_WINDOW_SIZE / 2;
private static final Buffer EMPTY_BUFFER = new Buffer();
public static final int ABSENT_ID = -1;
private final MethodDescriptor method;
private final String userAgent;
private final StatsTraceContext statsTraceCtx;
private String authority;
private Object outboundFlowState;
private volatile int id = ABSENT_ID;
private final TransportState state;
private final Sink sink = new Sink();
private final Attributes attributes;
private boolean useGet = false;
OkHttpClientStream(
MethodDescriptor method,
Metadata headers,
AsyncFrameWriter frameWriter,
OkHttpClientTransport transport,
OutboundFlowController outboundFlow,
Object lock,
int maxMessageSize,
String authority,
String userAgent,
StatsTraceContext statsTraceCtx,
TransportTracer transportTracer) {
super(
new OkHttpWritableBufferAllocator(),
statsTraceCtx,
transportTracer,
headers,
method.isSafe());
this.statsTraceCtx = checkNotNull(statsTraceCtx, "statsTraceCtx");
this.method = method;
this.authority = authority;
this.userAgent = userAgent;
// OkHttpClientStream is only created after the transport has finished connecting,
// so it is safe to read the transport attributes.
// We make a copy here for convenience, even though we can ask the transport.
this.attributes = transport.getAttributes();
this.state = new TransportState(maxMessageSize, statsTraceCtx, lock, frameWriter, outboundFlow,
transport);
}
@Override
protected TransportState transportState() {
return state;
}
@Override
protected Sink abstractClientStreamSink() {
return sink;
}
/**
* Returns the type of this stream.
*/
public MethodDescriptor.MethodType getType() {
return method.getType();
}
public int id() {
return id;
}
/**
* Returns whether the stream uses GET. This is not known until after {@link Sink#writeHeaders} is
* invoked.
*/
boolean useGet() {
return useGet;
}
@Override
public void setAuthority(String authority) {
this.authority = checkNotNull(authority, "authority");
}
@Override
public Attributes getAttributes() {
return attributes;
}
class Sink implements AbstractClientStream.Sink {
@SuppressWarnings("BetaApi") // BaseEncoding is stable in Guava 20.0
@Override
public void writeHeaders(Metadata metadata, byte[] payload) {
String defaultPath = "/" + method.getFullMethodName();
if (payload != null) {
useGet = true;
defaultPath += "?" + BaseEncoding.base64().encode(payload);
}
synchronized (state.lock) {
state.streamReady(metadata, defaultPath);
}
}
@Override
public void writeFrame(
WritableBuffer frame, boolean endOfStream, boolean flush, int numMessages) {
Buffer buffer;
if (frame == null) {
buffer = EMPTY_BUFFER;
} else {
buffer = ((OkHttpWritableBuffer) frame).buffer();
int size = (int) buffer.size();
if (size > 0) {
onSendingBytes(size);
}
}
synchronized (state.lock) {
state.sendBuffer(buffer, endOfStream, flush);
getTransportTracer().reportMessageSent(numMessages);
}
}
@Override
public void request(final int numMessages) {
synchronized (state.lock) {
state.requestMessagesFromDeframer(numMessages);
}
}
@Override
public void cancel(Status reason) {
synchronized (state.lock) {
state.cancel(reason, true, null);
}
}
}
class TransportState extends Http2ClientStreamTransportState {
private final Object lock;
@GuardedBy("lock")
private List requestHeaders;
/**
* Null iff {@link #requestHeaders} is null. Non-null iff neither {@link #cancel} nor
* {@link #start(int)} have been called.
*/
@GuardedBy("lock")
private Queue pendingData = new ArrayDeque();
@GuardedBy("lock")
private boolean cancelSent = false;
@GuardedBy("lock")
private int window = Utils.DEFAULT_WINDOW_SIZE;
@GuardedBy("lock")
private int processedWindow = Utils.DEFAULT_WINDOW_SIZE;
@GuardedBy("lock")
private final AsyncFrameWriter frameWriter;
@GuardedBy("lock")
private final OutboundFlowController outboundFlow;
@GuardedBy("lock")
private final OkHttpClientTransport transport;
public TransportState(
int maxMessageSize,
StatsTraceContext statsTraceCtx,
Object lock,
AsyncFrameWriter frameWriter,
OutboundFlowController outboundFlow,
OkHttpClientTransport transport) {
super(maxMessageSize, statsTraceCtx, OkHttpClientStream.this.getTransportTracer());
this.lock = checkNotNull(lock, "lock");
this.frameWriter = frameWriter;
this.outboundFlow = outboundFlow;
this.transport = transport;
}
@GuardedBy("lock")
public void start(int streamId) {
checkState(id == ABSENT_ID, "the stream has been started with id %s", streamId);
id = streamId;
state.onStreamAllocated();
if (pendingData != null) {
// Only happens when the stream has neither been started nor cancelled.
frameWriter.synStream(useGet, false, id, 0, requestHeaders);
statsTraceCtx.clientOutboundHeaders();
requestHeaders = null;
boolean flush = false;
while (!pendingData.isEmpty()) {
PendingData data = pendingData.poll();
outboundFlow.data(data.endOfStream, id, data.buffer, false);
if (data.flush) {
flush = true;
}
}
if (flush) {
outboundFlow.flush();
}
pendingData = null;
}
}
@GuardedBy("lock")
@Override
protected void onStreamAllocated() {
super.onStreamAllocated();
getTransportTracer().reportLocalStreamStarted();
}
@GuardedBy("lock")
@Override
protected void http2ProcessingFailed(Status status, boolean stopDelivery, Metadata trailers) {
cancel(status, stopDelivery, trailers);
}
@Override
@GuardedBy("lock")
public void deframeFailed(Throwable cause) {
http2ProcessingFailed(Status.fromThrowable(cause), true, new Metadata());
}
@Override
@GuardedBy("lock")
public void bytesRead(int processedBytes) {
processedWindow -= processedBytes;
if (processedWindow <= WINDOW_UPDATE_THRESHOLD) {
int delta = Utils.DEFAULT_WINDOW_SIZE - processedWindow;
window += delta;
processedWindow += delta;
frameWriter.windowUpdate(id(), delta);
}
}
@Override
@GuardedBy("lock")
public void deframerClosed(boolean hasPartialMessage) {
onEndOfStream();
super.deframerClosed(hasPartialMessage);
}
@Override
@GuardedBy("lock")
public void runOnTransportThread(final Runnable r) {
synchronized (lock) {
r.run();
}
}
/**
* Must be called with holding the transport lock.
*/
@GuardedBy("lock")
public void transportHeadersReceived(List headers, boolean endOfStream) {
if (endOfStream) {
transportTrailersReceived(Utils.convertTrailers(headers));
} else {
transportHeadersReceived(Utils.convertHeaders(headers));
}
}
/**
* Must be called with holding the transport lock.
*/
@GuardedBy("lock")
public void transportDataReceived(okio.Buffer frame, boolean endOfStream) {
// We only support 16 KiB frames, and the max permitted in HTTP/2 is 16 MiB. This is verified
// in OkHttp's Http2 deframer. In addition, this code is after the data has been read.
int length = (int) frame.size();
window -= length;
if (window < 0) {
frameWriter.rstStream(id(), ErrorCode.FLOW_CONTROL_ERROR);
transport.finishStream(
id(),
Status.INTERNAL.withDescription(
"Received data size exceeded our receiving window size"),
PROCESSED, false, null, null);
return;
}
super.transportDataReceived(new OkHttpReadableBuffer(frame), endOfStream);
}
@GuardedBy("lock")
private void onEndOfStream() {
if (!isOutboundClosed()) {
// If server's end-of-stream is received before client sends end-of-stream, we just send a
// reset to server to fully close the server side stream.
transport.finishStream(id(),null, PROCESSED, false, ErrorCode.CANCEL, null);
} else {
transport.finishStream(id(), null, PROCESSED, false, null, null);
}
}
@GuardedBy("lock")
private void cancel(Status reason, boolean stopDelivery, Metadata trailers) {
if (cancelSent) {
return;
}
cancelSent = true;
if (pendingData != null) {
// stream is pending.
transport.removePendingStream(OkHttpClientStream.this);
// release holding data, so they can be GCed or returned to pool earlier.
requestHeaders = null;
for (PendingData data : pendingData) {
data.buffer.clear();
}
pendingData = null;
transportReportStatus(reason, true, trailers != null ? trailers : new Metadata());
} else {
// If pendingData is null, start must have already been called, which means synStream has
// been called as well.
transport.finishStream(
id(), reason, PROCESSED, stopDelivery, ErrorCode.CANCEL, trailers);
}
}
@GuardedBy("lock")
private void sendBuffer(Buffer buffer, boolean endOfStream, boolean flush) {
if (cancelSent) {
return;
}
if (pendingData != null) {
// Stream is pending start, queue the data.
pendingData.add(new PendingData(buffer, endOfStream, flush));
} else {
checkState(id() != ABSENT_ID, "streamId should be set");
// If buffer > frameWriter.maxDataLength() the flow-controller will ensure that it is
// properly chunked.
outboundFlow.data(endOfStream, id(), buffer, flush);
}
}
@GuardedBy("lock")
private void streamReady(Metadata metadata, String path) {
requestHeaders = Headers.createRequestHeaders(metadata, path, authority, userAgent, useGet);
transport.streamReadyToStart(OkHttpClientStream.this);
}
}
void setOutboundFlowState(Object outboundFlowState) {
this.outboundFlowState = outboundFlowState;
}
Object getOutboundFlowState() {
return outboundFlowState;
}
private static class PendingData {
Buffer buffer;
boolean endOfStream;
boolean flush;
PendingData(Buffer buffer, boolean endOfStream, boolean flush) {
this.buffer = buffer;
this.endOfStream = endOfStream;
this.flush = flush;
}
}
}
