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// Copyright 2022 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/direct_sockets/udp_readable_stream_wrapper.h"
#include "base/functional/callback_forward.h"
#include "base/metrics/histogram_functions.h"
#include "mojo/public/cpp/bindings/pending_receiver.h"
#include "net/base/net_errors.h"
#include "third_party/blink/renderer/bindings/core/v8/v8_throw_dom_exception.h"
#include "third_party/blink/renderer/bindings/core/v8/v8_underlying_source.h"
#include "third_party/blink/renderer/bindings/core/v8/v8_union_arraybuffer_arraybufferview.h"
#include "third_party/blink/renderer/bindings/modules/v8/v8_udp_message.h"
#include "third_party/blink/renderer/core/core_probes_inl.h"
#include "third_party/blink/renderer/core/dom/dom_exception.h"
#include "third_party/blink/renderer/core/dom/events/event_target_impl.h"
#include "third_party/blink/renderer/core/execution_context/execution_context.h"
#include "third_party/blink/renderer/core/streams/readable_stream.h"
#include "third_party/blink/renderer/core/streams/readable_stream_default_controller_with_script_scope.h"
#include "third_party/blink/renderer/core/streams/underlying_source_base.h"
#include "third_party/blink/renderer/core/typed_arrays/dom_array_buffer.h"
#include "third_party/blink/renderer/core/typed_arrays/dom_typed_array.h"
#include "third_party/blink/renderer/modules/direct_sockets/stream_wrapper.h"
#include "third_party/blink/renderer/modules/direct_sockets/udp_writable_stream_wrapper.h"
#include "third_party/blink/renderer/platform/bindings/script_state.h"
#include "third_party/blink/renderer/platform/bindings/v8_throw_exception.h"
#include "third_party/blink/renderer/platform/heap/collection_support/heap_deque.h"
#include "third_party/blink/renderer/platform/heap/garbage_collected.h"
#include "third_party/blink/renderer/platform/wtf/text/wtf_string.h"
namespace blink {
namespace {
constexpr uint32_t kReadableStreamBufferSize = 32;
}
// UDPReadableStreamWrapper definition
UDPReadableStreamWrapper::UDPReadableStreamWrapper(
ScriptState* script_state,
CloseOnceCallback on_close,
const Member<UDPSocketMojoRemote> udp_socket,
mojo::PendingReceiver<network::mojom::blink::UDPSocketListener>
socket_listener,
uint64_t inspector_id)
: ReadableStreamDefaultWrapper(script_state),
on_close_(std::move(on_close)),
udp_socket_(udp_socket),
socket_listener_(this, ExecutionContext::From(script_state)),
inspector_id_(inspector_id) {
socket_listener_.Bind(std::move(socket_listener),
ExecutionContext::From(script_state)
->GetTaskRunner(TaskType::kNetworking));
socket_listener_.set_disconnect_handler(
WTF::BindOnce(&UDPReadableStreamWrapper::ErrorStream,
WrapWeakPersistent(this), net::ERR_CONNECTION_ABORTED));
ScriptState::Scope scope(script_state);
auto* source =
ReadableStreamDefaultWrapper::MakeForwardingUnderlyingSource(this);
SetSource(source);
auto* readable = ReadableStream::CreateWithCountQueueingStrategy(
script_state, source, /*high_water_mark=*/kReadableStreamBufferSize);
SetReadable(readable);
}
void UDPReadableStreamWrapper::Pull() {
// Keep pending_receive_requests_ equal to desired_size.
DCHECK(udp_socket_->get().is_bound());
int32_t desired_size = static_cast<int32_t>(Controller()->DesiredSize());
if (desired_size > pending_receive_requests_) {
uint32_t receive_more = desired_size - pending_receive_requests_;
udp_socket_->get()->ReceiveMore(receive_more);
pending_receive_requests_ += receive_more;
}
}
void UDPReadableStreamWrapper::Trace(Visitor* visitor) const {
visitor->Trace(udp_socket_);
visitor->Trace(socket_listener_);
ReadableStreamDefaultWrapper::Trace(visitor);
}
void UDPReadableStreamWrapper::CloseStream() {
if (GetState() != State::kOpen) {
return;
}
SetState(State::kClosed);
socket_listener_.reset();
std::move(on_close_).Run(/*exception=*/v8::Local<v8::Value>(),
/*net_error=*/net::OK);
}
void UDPReadableStreamWrapper::ErrorStream(int32_t error_code) {
if (GetState() != State::kOpen) {
return;
}
// Error codes are negative.
base::UmaHistogramSparse("DirectSockets.UDPReadableStreamError", -error_code);
SetState(State::kAborted);
socket_listener_.reset();
auto* script_state = GetScriptState();
// Scope is needed because there's no ScriptState* on the call stack for
// ScriptValue.
ScriptState::Scope scope{script_state};
auto exception = V8ThrowDOMException::CreateOrDie(
script_state->GetIsolate(), DOMExceptionCode::kNetworkError,
String{"Stream aborted by the remote: " +
net::ErrorToString(error_code)});
Controller()->Error(exception);
std::move(on_close_).Run(exception, error_code);
}
// Invoked when data is received.
// - When UDPSocket is used with Bind() (i.e. when localAddress/localPort in
// options)
// On success, |result| is net::OK. |src_addr| indicates the address of the
// sender. |data| contains the received data.
// On failure, |result| is a negative network error code. |data| is null.
// |src_addr| might be null.
// - When UDPSocket is used with Connect():
// |src_addr| is always null. Data are always received from the remote
// address specified in Connect().
// On success, |result| is net::OK. |data| contains the received data.
// On failure, |result| is a negative network error code. |data| is null.
//
// Note that in both cases, |data| can be an empty buffer when |result| is
// net::OK, which indicates a zero-byte payload.
// For further details please refer to the
// services/network/public/mojom/udp_socket.mojom file.
void UDPReadableStreamWrapper::OnReceived(
int32_t result,
const std::optional<::net::IPEndPoint>& src_addr,
std::optional<::base::span<const ::uint8_t>> data) {
if (result != net::OK) {
if (result == net::ERR_MSG_TOO_BIG) {
// TODO(crbug.com/362145407): Figure out the root cause.
// Error codes are negative.
base::UmaHistogramSparse("DirectSockets.UDPReadableStreamError", -result);
DCHECK_GT(pending_receive_requests_, 0);
pending_receive_requests_--;
// For the success case pulling happens automatically after Enqueue();
// however, here we have to pull manually to request one more packet.
Pull();
return;
}
ErrorStream(result);
return;
}
DCHECK(data);
DCHECK_GT(pending_receive_requests_, 0);
pending_receive_requests_--;
auto* buffer = DOMUint8Array::Create(data.value());
auto* message = UDPMessage::Create();
message->setData(MakeGarbageCollected<V8UnionArrayBufferOrArrayBufferView>(
NotShared<DOMUint8Array>(buffer)));
std::optional<String> probe_remote_addr;
std::optional<uint16_t> probe_remote_port;
if (src_addr) {
auto remote_address = String{src_addr->ToStringWithoutPort()};
message->setRemoteAddress(remote_address);
message->setRemotePort(src_addr->port());
probe_remote_addr = remote_address;
probe_remote_port = src_addr->port();
}
probe::DirectUDPSocketChunkReceived(
*GetScriptState(), inspector_id_, data.value(),
std::move(probe_remote_addr), std::move(probe_remote_port));
Controller()->Enqueue(message);
}
} // namespace blink
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