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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.internal;
import static com.google.common.base.Preconditions.checkArgument;
import static com.google.common.base.Preconditions.checkNotNull;
import static com.google.common.base.Preconditions.checkState;
import static com.google.common.util.concurrent.MoreExecutors.directExecutor;
import static io.grpc.ClientStreamTracer.NAME_RESOLUTION_DELAYED;
import static io.grpc.Contexts.statusFromCancelled;
import static io.grpc.Status.DEADLINE_EXCEEDED;
import static io.grpc.internal.GrpcUtil.CONTENT_ACCEPT_ENCODING_KEY;
import static io.grpc.internal.GrpcUtil.CONTENT_ENCODING_KEY;
import static io.grpc.internal.GrpcUtil.CONTENT_LENGTH_KEY;
import static io.grpc.internal.GrpcUtil.MESSAGE_ACCEPT_ENCODING_KEY;
import static io.grpc.internal.GrpcUtil.MESSAGE_ENCODING_KEY;
import com.google.common.annotations.VisibleForTesting;
import com.google.common.base.MoreObjects;
import io.grpc.Attributes;
import io.grpc.CallOptions;
import io.grpc.ClientCall;
import io.grpc.ClientStreamTracer;
import io.grpc.Codec;
import io.grpc.Compressor;
import io.grpc.CompressorRegistry;
import io.grpc.Context;
import io.grpc.Context.CancellationListener;
import io.grpc.Deadline;
import io.grpc.DecompressorRegistry;
import io.grpc.InternalConfigSelector;
import io.grpc.InternalDecompressorRegistry;
import io.grpc.Metadata;
import io.grpc.MethodDescriptor;
import io.grpc.MethodDescriptor.MethodType;
import io.grpc.Status;
import io.grpc.internal.ManagedChannelServiceConfig.MethodInfo;
import io.perfmark.Link;
import io.perfmark.PerfMark;
import io.perfmark.Tag;
import io.perfmark.TaskCloseable;
import java.io.InputStream;
import java.nio.charset.Charset;
import java.util.Locale;
import java.util.concurrent.CancellationException;
import java.util.concurrent.Executor;
import java.util.concurrent.ScheduledExecutorService;
import java.util.concurrent.ScheduledFuture;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.TimeoutException;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.annotation.Nullable;
/**
* Implementation of {@link ClientCall}.
*/
final class ClientCallImpl extends ClientCall {
private static final Logger log = Logger.getLogger(ClientCallImpl.class.getName());
private static final byte[] FULL_STREAM_DECOMPRESSION_ENCODINGS
= "gzip".getBytes(Charset.forName("US-ASCII"));
private static final double NANO_TO_SECS = 1.0 * TimeUnit.SECONDS.toNanos(1);
private final MethodDescriptor method;
private final Tag tag;
private final Executor callExecutor;
private final boolean callExecutorIsDirect;
private final CallTracer channelCallsTracer;
private final Context context;
private CancellationHandler cancellationHandler;
private final boolean unaryRequest;
private CallOptions callOptions;
private ClientStream stream;
private boolean cancelCalled;
private boolean halfCloseCalled;
private final ClientStreamProvider clientStreamProvider;
private final ScheduledExecutorService deadlineCancellationExecutor;
private boolean fullStreamDecompression;
private DecompressorRegistry decompressorRegistry = DecompressorRegistry.getDefaultInstance();
private CompressorRegistry compressorRegistry = CompressorRegistry.getDefaultInstance();
ClientCallImpl(
MethodDescriptor method, Executor executor, CallOptions callOptions,
ClientStreamProvider clientStreamProvider,
ScheduledExecutorService deadlineCancellationExecutor,
CallTracer channelCallsTracer,
// TODO(zdapeng): remove this arg
@Nullable InternalConfigSelector configSelector) {
this.method = method;
// TODO(carl-mastrangelo): consider moving this construction to ManagedChannelImpl.
this.tag = PerfMark.createTag(method.getFullMethodName(), System.identityHashCode(this));
// If we know that the executor is a direct executor, we don't need to wrap it with a
// SerializingExecutor. This is purely for performance reasons.
// See https://github.com/grpc/grpc-java/issues/368
if (executor == directExecutor()) {
this.callExecutor = new SerializeReentrantCallsDirectExecutor();
callExecutorIsDirect = true;
} else {
this.callExecutor = new SerializingExecutor(executor);
callExecutorIsDirect = false;
}
this.channelCallsTracer = channelCallsTracer;
// Propagate the context from the thread which initiated the call to all callbacks.
this.context = Context.current();
this.unaryRequest = method.getType() == MethodType.UNARY
|| method.getType() == MethodType.SERVER_STREAMING;
this.callOptions = callOptions;
this.clientStreamProvider = clientStreamProvider;
this.deadlineCancellationExecutor = deadlineCancellationExecutor;
PerfMark.event("ClientCall.", tag);
}
/**
* Provider of {@link ClientStream}s.
*/
interface ClientStreamProvider {
ClientStream newStream(
MethodDescriptor method,
CallOptions callOptions,
Metadata headers,
Context context);
}
ClientCallImpl setFullStreamDecompression(boolean fullStreamDecompression) {
this.fullStreamDecompression = fullStreamDecompression;
return this;
}
ClientCallImpl setDecompressorRegistry(DecompressorRegistry decompressorRegistry) {
this.decompressorRegistry = decompressorRegistry;
return this;
}
ClientCallImpl setCompressorRegistry(CompressorRegistry compressorRegistry) {
this.compressorRegistry = compressorRegistry;
return this;
}
@VisibleForTesting
static void prepareHeaders(
Metadata headers,
DecompressorRegistry decompressorRegistry,
Compressor compressor,
boolean fullStreamDecompression) {
headers.discardAll(CONTENT_LENGTH_KEY);
headers.discardAll(MESSAGE_ENCODING_KEY);
if (compressor != Codec.Identity.NONE) {
headers.put(MESSAGE_ENCODING_KEY, compressor.getMessageEncoding());
}
headers.discardAll(MESSAGE_ACCEPT_ENCODING_KEY);
byte[] advertisedEncodings =
InternalDecompressorRegistry.getRawAdvertisedMessageEncodings(decompressorRegistry);
if (advertisedEncodings.length != 0) {
headers.put(MESSAGE_ACCEPT_ENCODING_KEY, advertisedEncodings);
}
headers.discardAll(CONTENT_ENCODING_KEY);
headers.discardAll(CONTENT_ACCEPT_ENCODING_KEY);
if (fullStreamDecompression) {
headers.put(CONTENT_ACCEPT_ENCODING_KEY, FULL_STREAM_DECOMPRESSION_ENCODINGS);
}
}
@Override
public void start(Listener observer, Metadata headers) {
try (TaskCloseable ignore = PerfMark.traceTask("ClientCall.start")) {
PerfMark.attachTag(tag);
startInternal(observer, headers);
}
}
private void startInternal(Listener observer, Metadata headers) {
checkState(stream == null, "Already started");
checkState(!cancelCalled, "call was cancelled");
checkNotNull(observer, "observer");
checkNotNull(headers, "headers");
if (context.isCancelled()) {
// Context is already cancelled so no need to create a real stream, just notify the observer
// of cancellation via callback on the executor
stream = NoopClientStream.INSTANCE;
final Listener finalObserver = observer;
class ClosedByContext extends ContextRunnable {
ClosedByContext() {
super(context);
}
@Override
public void runInContext() {
closeObserver(finalObserver, statusFromCancelled(context), new Metadata());
}
}
callExecutor.execute(new ClosedByContext());
return;
}
applyMethodConfig();
final String compressorName = callOptions.getCompressor();
Compressor compressor;
if (compressorName != null) {
compressor = compressorRegistry.lookupCompressor(compressorName);
if (compressor == null) {
stream = NoopClientStream.INSTANCE;
final Listener finalObserver = observer;
class ClosedByNotFoundCompressor extends ContextRunnable {
ClosedByNotFoundCompressor() {
super(context);
}
@Override
public void runInContext() {
closeObserver(
finalObserver,
Status.INTERNAL.withDescription(
String.format("Unable to find compressor by name %s", compressorName)),
new Metadata());
}
}
callExecutor.execute(new ClosedByNotFoundCompressor());
return;
}
} else {
compressor = Codec.Identity.NONE;
}
prepareHeaders(headers, decompressorRegistry, compressor, fullStreamDecompression);
Deadline effectiveDeadline = effectiveDeadline();
boolean contextIsDeadlineSource = effectiveDeadline != null
&& effectiveDeadline.equals(context.getDeadline());
cancellationHandler = new CancellationHandler(effectiveDeadline, contextIsDeadlineSource);
boolean deadlineExceeded = effectiveDeadline != null && cancellationHandler.remainingNanos <= 0;
if (!deadlineExceeded) {
stream = clientStreamProvider.newStream(method, callOptions, headers, context);
} else {
ClientStreamTracer[] tracers =
GrpcUtil.getClientStreamTracers(callOptions, headers, 0, false);
String deadlineName = contextIsDeadlineSource ? "Context" : "CallOptions";
Long nameResolutionDelay = callOptions.getOption(NAME_RESOLUTION_DELAYED);
String description = String.format(
"ClientCall started after %s deadline was exceeded %.9f seconds ago. "
+ "Name resolution delay %.9f seconds.", deadlineName,
cancellationHandler.remainingNanos / NANO_TO_SECS,
nameResolutionDelay == null ? 0 : nameResolutionDelay / NANO_TO_SECS);
stream = new FailingClientStream(DEADLINE_EXCEEDED.withDescription(description), tracers);
}
if (callExecutorIsDirect) {
stream.optimizeForDirectExecutor();
}
if (callOptions.getAuthority() != null) {
stream.setAuthority(callOptions.getAuthority());
}
if (callOptions.getMaxInboundMessageSize() != null) {
stream.setMaxInboundMessageSize(callOptions.getMaxInboundMessageSize());
}
if (callOptions.getMaxOutboundMessageSize() != null) {
stream.setMaxOutboundMessageSize(callOptions.getMaxOutboundMessageSize());
}
if (effectiveDeadline != null) {
stream.setDeadline(effectiveDeadline);
}
stream.setCompressor(compressor);
if (fullStreamDecompression) {
stream.setFullStreamDecompression(fullStreamDecompression);
}
stream.setDecompressorRegistry(decompressorRegistry);
channelCallsTracer.reportCallStarted();
stream.start(new ClientStreamListenerImpl(observer));
// Delay any sources of cancellation after start(), because most of the transports are broken if
// they receive cancel before start. Issue #1343 has more details
// Propagate later Context cancellation to the remote side.
cancellationHandler.setUp();
}
private void applyMethodConfig() {
MethodInfo info = callOptions.getOption(MethodInfo.KEY);
if (info == null) {
return;
}
if (info.timeoutNanos != null) {
Deadline newDeadline = Deadline.after(info.timeoutNanos, TimeUnit.NANOSECONDS);
Deadline existingDeadline = callOptions.getDeadline();
// If the new deadline is sooner than the existing deadline, swap them.
if (existingDeadline == null || newDeadline.compareTo(existingDeadline) < 0) {
callOptions = callOptions.withDeadline(newDeadline);
}
}
if (info.waitForReady != null) {
callOptions =
info.waitForReady ? callOptions.withWaitForReady() : callOptions.withoutWaitForReady();
}
if (info.maxInboundMessageSize != null) {
Integer existingLimit = callOptions.getMaxInboundMessageSize();
if (existingLimit != null) {
callOptions =
callOptions.withMaxInboundMessageSize(
Math.min(existingLimit, info.maxInboundMessageSize));
} else {
callOptions = callOptions.withMaxInboundMessageSize(info.maxInboundMessageSize);
}
}
if (info.maxOutboundMessageSize != null) {
Integer existingLimit = callOptions.getMaxOutboundMessageSize();
if (existingLimit != null) {
callOptions =
callOptions.withMaxOutboundMessageSize(
Math.min(existingLimit, info.maxOutboundMessageSize));
} else {
callOptions = callOptions.withMaxOutboundMessageSize(info.maxOutboundMessageSize);
}
}
}
private final class CancellationHandler implements Runnable, CancellationListener {
private final boolean contextIsDeadlineSource;
private final boolean hasDeadline;
private final long remainingNanos;
private volatile ScheduledFuture deadlineCancellationFuture;
private volatile boolean tearDownCalled;
CancellationHandler(Deadline deadline, boolean contextIsDeadlineSource) {
this.contextIsDeadlineSource = contextIsDeadlineSource;
if (deadline == null) {
hasDeadline = false;
remainingNanos = 0;
} else {
hasDeadline = true;
remainingNanos = deadline.timeRemaining(TimeUnit.NANOSECONDS);
}
}
void setUp() {
if (tearDownCalled) {
return;
}
if (hasDeadline
// If the context has the effective deadline, we don't need to schedule an extra task.
&& !contextIsDeadlineSource
// If the channel has been terminated, we don't need to schedule an extra task.
&& deadlineCancellationExecutor != null) {
deadlineCancellationFuture = deadlineCancellationExecutor.schedule(
new LogExceptionRunnable(this), remainingNanos, TimeUnit.NANOSECONDS);
}
context.addListener(this, directExecutor());
if (tearDownCalled) {
// Race detected! Re-run to make sure the future is cancelled and context listener removed
tearDown();
}
}
// May be called multiple times, and race with setUp()
void tearDown() {
tearDownCalled = true;
ScheduledFuture deadlineCancellationFuture = this.deadlineCancellationFuture;
if (deadlineCancellationFuture != null) {
deadlineCancellationFuture.cancel(false);
}
context.removeListener(this);
}
@Override
public void cancelled(Context context) {
if (hasDeadline && contextIsDeadlineSource
&& context.cancellationCause() instanceof TimeoutException) {
stream.cancel(formatDeadlineExceededStatus());
return;
}
stream.cancel(statusFromCancelled(context));
}
@Override
public void run() {
stream.cancel(formatDeadlineExceededStatus());
}
Status formatDeadlineExceededStatus() {
// DelayedStream.cancel() is safe to call from a thread that is different from where the
// stream is created.
long seconds = Math.abs(remainingNanos) / TimeUnit.SECONDS.toNanos(1);
long nanos = Math.abs(remainingNanos) % TimeUnit.SECONDS.toNanos(1);
StringBuilder buf = new StringBuilder();
buf.append(contextIsDeadlineSource ? "Context" : "CallOptions");
buf.append(" deadline exceeded after ");
if (remainingNanos < 0) {
buf.append('-');
}
buf.append(seconds);
buf.append(String.format(Locale.US, ".%09d", nanos));
buf.append("s. ");
Long nsDelay = callOptions.getOption(NAME_RESOLUTION_DELAYED);
buf.append(String.format(Locale.US, "Name resolution delay %.9f seconds.",
nsDelay == null ? 0 : nsDelay / NANO_TO_SECS));
if (stream != null) {
InsightBuilder insight = new InsightBuilder();
stream.appendTimeoutInsight(insight);
buf.append(" ");
buf.append(insight);
}
return DEADLINE_EXCEEDED.withDescription(buf.toString());
}
}
@Nullable
private Deadline effectiveDeadline() {
// Call options and context are immutable, so we don't need to cache the deadline.
return min(callOptions.getDeadline(), context.getDeadline());
}
@Nullable
private static Deadline min(@Nullable Deadline deadline0, @Nullable Deadline deadline1) {
if (deadline0 == null) {
return deadline1;
}
if (deadline1 == null) {
return deadline0;
}
return deadline0.minimum(deadline1);
}
@Override
public void request(int numMessages) {
try (TaskCloseable ignore = PerfMark.traceTask("ClientCall.request")) {
PerfMark.attachTag(tag);
checkState(stream != null, "Not started");
checkArgument(numMessages >= 0, "Number requested must be non-negative");
stream.request(numMessages);
}
}
@Override
public void cancel(@Nullable String message, @Nullable Throwable cause) {
try (TaskCloseable ignore = PerfMark.traceTask("ClientCall.cancel")) {
PerfMark.attachTag(tag);
cancelInternal(message, cause);
}
}
private void cancelInternal(@Nullable String message, @Nullable Throwable cause) {
if (message == null && cause == null) {
cause = new CancellationException("Cancelled without a message or cause");
log.log(Level.WARNING, "Cancelling without a message or cause is suboptimal", cause);
}
if (cancelCalled) {
return;
}
cancelCalled = true;
try {
// Cancel is called in exception handling cases, so it may be the case that the
// stream was never successfully created or start has never been called.
if (stream != null) {
Status status = Status.CANCELLED;
if (message != null) {
status = status.withDescription(message);
} else {
status = status.withDescription("Call cancelled without message");
}
if (cause != null) {
status = status.withCause(cause);
}
stream.cancel(status);
}
} finally {
// start() might not have been called
if (cancellationHandler != null) {
cancellationHandler.tearDown();
}
}
}
@Override
public void halfClose() {
try (TaskCloseable ignore = PerfMark.traceTask("ClientCall.halfClose")) {
PerfMark.attachTag(tag);
halfCloseInternal();
}
}
private void halfCloseInternal() {
checkState(stream != null, "Not started");
checkState(!cancelCalled, "call was cancelled");
checkState(!halfCloseCalled, "call already half-closed");
halfCloseCalled = true;
stream.halfClose();
}
@Override
public void sendMessage(ReqT message) {
try (TaskCloseable ignore = PerfMark.traceTask("ClientCall.sendMessage")) {
PerfMark.attachTag(tag);
sendMessageInternal(message);
}
}
private void sendMessageInternal(ReqT message) {
checkState(stream != null, "Not started");
checkState(!cancelCalled, "call was cancelled");
checkState(!halfCloseCalled, "call was half-closed");
try {
if (stream instanceof RetriableStream) {
@SuppressWarnings("unchecked")
RetriableStream retriableStream = (RetriableStream) stream;
retriableStream.sendMessage(message);
} else {
stream.writeMessage(method.streamRequest(message));
}
} catch (RuntimeException e) {
stream.cancel(Status.CANCELLED.withCause(e).withDescription("Failed to stream message"));
return;
} catch (Error e) {
stream.cancel(Status.CANCELLED.withDescription("Client sendMessage() failed with Error"));
throw e;
}
// For unary requests, we don't flush since we know that halfClose should be coming soon. This
// allows us to piggy-back the END_STREAM=true on the last message frame without opening the
// possibility of broken applications forgetting to call halfClose without noticing.
if (!unaryRequest) {
stream.flush();
}
}
@Override
public void setMessageCompression(boolean enabled) {
checkState(stream != null, "Not started");
stream.setMessageCompression(enabled);
}
@Override
public boolean isReady() {
if (halfCloseCalled) {
return false;
}
return stream.isReady();
}
@Override
public Attributes getAttributes() {
if (stream != null) {
return stream.getAttributes();
}
return Attributes.EMPTY;
}
private void closeObserver(Listener observer, Status status, Metadata trailers) {
observer.onClose(status, trailers);
}
@Override
public String toString() {
return MoreObjects.toStringHelper(this).add("method", method).toString();
}
private class ClientStreamListenerImpl implements ClientStreamListener {
private final Listener observer;
private Status exceptionStatus;
public ClientStreamListenerImpl(Listener observer) {
this.observer = checkNotNull(observer, "observer");
}
/**
* Cancels call and schedules onClose() notification. May only be called from the application
* thread.
*/
private void exceptionThrown(Status status) {
// Since each RPC can have its own executor, we can only call onClose() when we are sure there
// will be no further callbacks. We set the status here and overwrite the onClose() details
// when it arrives.
exceptionStatus = status;
stream.cancel(status);
}
@Override
public void headersRead(final Metadata headers) {
try (TaskCloseable ignore = PerfMark.traceTask("ClientStreamListener.headersRead")) {
PerfMark.attachTag(tag);
final Link link = PerfMark.linkOut();
final class HeadersRead extends ContextRunnable {
HeadersRead() {
super(context);
}
@Override
public void runInContext() {
try (TaskCloseable ignore = PerfMark.traceTask("ClientCall$Listener.headersRead")) {
PerfMark.attachTag(tag);
PerfMark.linkIn(link);
runInternal();
}
}
private void runInternal() {
if (exceptionStatus != null) {
return;
}
try {
observer.onHeaders(headers);
} catch (Throwable t) {
exceptionThrown(
Status.CANCELLED.withCause(t).withDescription("Failed to read headers"));
}
}
}
callExecutor.execute(new HeadersRead());
}
}
@Override
public void messagesAvailable(final MessageProducer producer) {
try (TaskCloseable ignore = PerfMark.traceTask("ClientStreamListener.messagesAvailable")) {
PerfMark.attachTag(tag);
final Link link = PerfMark.linkOut();
final class MessagesAvailable extends ContextRunnable {
MessagesAvailable() {
super(context);
}
@Override
public void runInContext() {
try (TaskCloseable ignore =
PerfMark.traceTask("ClientCall$Listener.messagesAvailable")) {
PerfMark.attachTag(tag);
PerfMark.linkIn(link);
runInternal();
}
}
private void runInternal() {
if (exceptionStatus != null) {
GrpcUtil.closeQuietly(producer);
return;
}
try {
InputStream message;
while ((message = producer.next()) != null) {
try {
observer.onMessage(method.parseResponse(message));
} catch (Throwable t) {
GrpcUtil.closeQuietly(message);
throw t;
}
message.close();
}
} catch (Throwable t) {
GrpcUtil.closeQuietly(producer);
exceptionThrown(
Status.CANCELLED.withCause(t).withDescription("Failed to read message."));
}
}
}
callExecutor.execute(new MessagesAvailable());
}
}
@Override
public void closed(Status status, RpcProgress rpcProgress, Metadata trailers) {
try (TaskCloseable ignore = PerfMark.traceTask("ClientStreamListener.closed")) {
PerfMark.attachTag(tag);
closedInternal(status, rpcProgress, trailers);
}
}
private void closedInternal(
Status status, @SuppressWarnings("unused") RpcProgress rpcProgress, Metadata trailers) {
Deadline deadline = effectiveDeadline();
if (status.getCode() == Status.Code.CANCELLED && deadline != null) {
// When the server's deadline expires, it can only reset the stream with CANCEL and no
// description. Since our timer may be delayed in firing, we double-check the deadline and
// turn the failure into the likely more helpful DEADLINE_EXCEEDED status.
if (deadline.isExpired()) {
status = cancellationHandler.formatDeadlineExceededStatus();
// Replace trailers to prevent mixing sources of status and trailers.
trailers = new Metadata();
}
}
final Status savedStatus = status;
final Metadata savedTrailers = trailers;
final Link link = PerfMark.linkOut();
final class StreamClosed extends ContextRunnable {
StreamClosed() {
super(context);
}
@Override
public void runInContext() {
try (TaskCloseable ignore = PerfMark.traceTask("ClientCall$Listener.onClose")) {
PerfMark.attachTag(tag);
PerfMark.linkIn(link);
runInternal();
}
}
private void runInternal() {
cancellationHandler.tearDown();
Status status = savedStatus;
Metadata trailers = savedTrailers;
if (exceptionStatus != null) {
// Ideally exceptionStatus == savedStatus, as exceptionStatus was passed to cancel().
// However the cancel is racy and this closed() may have already been queued when the
// cancellation occurred. Since other calls like onMessage() will throw away data if
// exceptionStatus != null, it is semantically essential that we _not_ use a status
// provided by the server.
status = exceptionStatus;
// Replace trailers to prevent mixing sources of status and trailers.
trailers = new Metadata();
}
try {
closeObserver(observer, status, trailers);
} finally {
channelCallsTracer.reportCallEnded(status.isOk());
}
}
}
callExecutor.execute(new StreamClosed());
}
@Override
public void onReady() {
if (method.getType().clientSendsOneMessage()) {
return;
}
try (TaskCloseable ignore = PerfMark.traceTask("ClientStreamListener.onReady")) {
PerfMark.attachTag(tag);
final Link link = PerfMark.linkOut();
final class StreamOnReady extends ContextRunnable {
StreamOnReady() {
super(context);
}
@Override
public void runInContext() {
try (TaskCloseable ignore = PerfMark.traceTask("ClientCall$Listener.onReady")) {
PerfMark.attachTag(tag);
PerfMark.linkIn(link);
runInternal();
}
}
private void runInternal() {
if (exceptionStatus != null) {
return;
}
try {
observer.onReady();
} catch (Throwable t) {
exceptionThrown(
Status.CANCELLED.withCause(t).withDescription("Failed to call onReady."));
}
}
}
callExecutor.execute(new StreamOnReady());
}
}
}
}
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