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// Copyright 2019 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "third_party/blink/renderer/modules/serial/serial_port_underlying_source.h"
#include "base/numerics/safe_conversions.h"
#include "third_party/blink/renderer/bindings/core/v8/script_promise_resolver.h"
#include "third_party/blink/renderer/bindings/core/v8/v8_throw_dom_exception.h"
#include "third_party/blink/renderer/core/streams/readable_byte_stream_controller.h"
#include "third_party/blink/renderer/core/streams/readable_stream_byob_request.h"
#include "third_party/blink/renderer/core/typed_arrays/dom_array_piece.h"
#include "third_party/blink/renderer/core/typed_arrays/dom_typed_array.h"
#include "third_party/blink/renderer/modules/serial/serial_port.h"
#include "third_party/blink/renderer/platform/bindings/exception_code.h"
#include "third_party/blink/renderer/platform/wtf/functional.h"
namespace blink {
namespace {
using ::device::mojom::blink::SerialReceiveError;
}
SerialPortUnderlyingSource::SerialPortUnderlyingSource(
ScriptState* script_state,
SerialPort* serial_port,
mojo::ScopedDataPipeConsumerHandle handle)
: ExecutionContextLifecycleObserver(ExecutionContext::From(script_state)),
data_pipe_(std::move(handle)),
watcher_(FROM_HERE, mojo::SimpleWatcher::ArmingPolicy::MANUAL),
script_state_(script_state),
serial_port_(serial_port) {
watcher_.Watch(data_pipe_.get(), MOJO_HANDLE_SIGNAL_READABLE,
MOJO_TRIGGER_CONDITION_SIGNALS_SATISFIED,
WTF::BindRepeating(&SerialPortUnderlyingSource::OnHandleReady,
WrapWeakPersistent(this)));
}
ScriptPromise<IDLUndefined> SerialPortUnderlyingSource::Pull(
ReadableByteStreamController* controller,
ExceptionState&) {
DCHECK(controller_ == nullptr || controller_ == controller);
controller_ = controller;
DCHECK(data_pipe_);
ReadDataOrArmWatcher();
// pull() signals that the stream wants more data. By resolving immediately
// we allow the stream to be canceled before that data is received. pull()
// will not be called again until a chunk is enqueued or if an error has been
// signaled to the controller.
return ToResolvedUndefinedPromise(script_state_.Get());
}
ScriptPromise<IDLUndefined> SerialPortUnderlyingSource::Cancel() {
DCHECK(data_pipe_);
Close();
// If the port is closing the flush will be performed when it closes so we
// don't need to do it here.
if (serial_port_->IsClosing()) {
serial_port_->UnderlyingSourceClosed();
return ToResolvedUndefinedPromise(script_state_.Get());
}
auto* resolver =
MakeGarbageCollected<ScriptPromiseResolver<IDLUndefined>>(script_state_);
serial_port_->Flush(
device::mojom::blink::SerialPortFlushMode::kReceive,
WTF::BindOnce(&SerialPortUnderlyingSource::OnFlush, WrapPersistent(this),
WrapPersistent(resolver)));
return resolver->Promise();
}
ScriptPromise<IDLUndefined> SerialPortUnderlyingSource::Cancel(
v8::Local<v8::Value> reason) {
return Cancel();
}
ScriptState* SerialPortUnderlyingSource::GetScriptState() {
return script_state_.Get();
}
void SerialPortUnderlyingSource::ContextDestroyed() {
Close();
}
void SerialPortUnderlyingSource::SignalErrorOnClose(SerialReceiveError error) {
ScriptState::Scope script_state_scope(script_state_);
v8::Isolate* isolate = script_state_->GetIsolate();
v8::Local<v8::Value> exception;
switch (error) {
case SerialReceiveError::NONE:
NOTREACHED();
case SerialReceiveError::DISCONNECTED:
[[fallthrough]];
case SerialReceiveError::DEVICE_LOST:
exception = V8ThrowDOMException::CreateOrDie(
isolate, DOMExceptionCode::kNetworkError,
"The device has been lost.");
break;
case SerialReceiveError::BREAK:
exception = V8ThrowDOMException::CreateOrDie(
isolate, DOMExceptionCode::kBreakError, "Break received");
break;
case SerialReceiveError::FRAME_ERROR:
exception = V8ThrowDOMException::CreateOrDie(
isolate, DOMExceptionCode::kFramingError, "Framing error");
break;
case SerialReceiveError::OVERRUN:
[[fallthrough]];
case SerialReceiveError::BUFFER_OVERFLOW:
exception = V8ThrowDOMException::CreateOrDie(
isolate, DOMExceptionCode::kBufferOverrunError, "Buffer overrun");
break;
case SerialReceiveError::PARITY_ERROR:
exception = V8ThrowDOMException::CreateOrDie(
isolate, DOMExceptionCode::kParityError, "Parity error");
break;
case SerialReceiveError::SYSTEM_ERROR:
exception = V8ThrowDOMException::CreateOrDie(
isolate, DOMExceptionCode::kUnknownError,
"An unknown system error has occurred.");
break;
}
if (data_pipe_) {
// Pipe is still open. Wait for PipeClosed() to be called.
pending_exception_ = ScriptValue(isolate, exception);
return;
}
controller_->error(script_state_, ScriptValue(isolate, exception));
serial_port_->UnderlyingSourceClosed();
}
void SerialPortUnderlyingSource::Trace(Visitor* visitor) const {
visitor->Trace(pending_exception_);
visitor->Trace(script_state_);
visitor->Trace(serial_port_);
visitor->Trace(controller_);
UnderlyingByteSourceBase::Trace(visitor);
ExecutionContextLifecycleObserver::Trace(visitor);
}
void SerialPortUnderlyingSource::ReadDataOrArmWatcher() {
base::span<const uint8_t> buffer;
MojoResult result =
data_pipe_->BeginReadData(MOJO_READ_DATA_FLAG_NONE, buffer);
switch (result) {
case MOJO_RESULT_OK: {
// respond() or enqueue() will only throw if their arguments are invalid
// or the stream is errored. The code below guarantees that the length is
// in range and the chunk is a valid view. If the stream becomes errored
// then this method cannot be called because the watcher is disarmed.
NonThrowableExceptionState exception_state;
if (ReadableStreamBYOBRequest* request = controller_->byobRequest()) {
DOMArrayPiece view(request->view().Get());
buffer = buffer.first(std::min(view.ByteLength(), buffer.size()));
view.ByteSpan().copy_prefix_from(buffer);
request->respond(script_state_, buffer.size(), exception_state);
} else {
auto chunk = NotShared(DOMUint8Array::Create(buffer));
controller_->enqueue(script_state_, chunk, exception_state);
}
result = data_pipe_->EndReadData(buffer.size());
DCHECK_EQ(result, MOJO_RESULT_OK);
break;
}
case MOJO_RESULT_FAILED_PRECONDITION:
PipeClosed();
break;
case MOJO_RESULT_SHOULD_WAIT:
watcher_.ArmOrNotify();
break;
default:
invalid_data_pipe_read_result_ = result;
DUMP_WILL_BE_NOTREACHED() << "Invalid data pipe read result: " << result;
break;
}
}
void SerialPortUnderlyingSource::OnHandleReady(
MojoResult result,
const mojo::HandleSignalsState& state) {
ScriptState::Scope script_state_scope(script_state_);
switch (result) {
case MOJO_RESULT_OK:
ReadDataOrArmWatcher();
break;
case MOJO_RESULT_SHOULD_WAIT:
watcher_.ArmOrNotify();
break;
case MOJO_RESULT_FAILED_PRECONDITION:
PipeClosed();
break;
}
}
void SerialPortUnderlyingSource::OnFlush(
ScriptPromiseResolver<IDLUndefined>* resolver) {
serial_port_->UnderlyingSourceClosed();
resolver->Resolve();
}
void SerialPortUnderlyingSource::PipeClosed() {
if (!pending_exception_.IsEmpty()) {
controller_->error(script_state_, pending_exception_);
pending_exception_.Clear();
serial_port_->UnderlyingSourceClosed();
}
Close();
}
void SerialPortUnderlyingSource::Close() {
watcher_.Cancel();
data_pipe_.reset();
}
void SerialPortUnderlyingSource::Dispose() {
// Ensure that `watcher_` is disarmed so that `OnHandleReady()` is not called
// after this object becomes garbage.
Close();
}
} // namespace blink
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