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// Copyright 2019 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "cast/common/channel/cast_socket.h"
#include <atomic>
#include "cast/common/channel/message_framer.h"
#include "util/logging.h"
namespace cast {
namespace channel {
using message_serialization::DeserializeResult;
using openscreen::ErrorOr;
using openscreen::platform::TlsConnection;
uint32_t GetNextSocketId() {
static std::atomic<uint32_t> id(1);
return id++;
}
CastSocket::CastSocket(std::unique_ptr<TlsConnection> connection,
Client* client,
uint32_t socket_id)
: client_(client),
connection_(std::move(connection)),
socket_id_(socket_id) {
OSP_DCHECK(client);
connection_->SetClient(this);
}
CastSocket::~CastSocket() {
connection_->SetClient(nullptr);
}
Error CastSocket::SendMessage(const CastMessage& message) {
if (state_ == State::kError) {
return Error::Code::kSocketClosedFailure;
}
const ErrorOr<std::vector<uint8_t>> out =
message_serialization::Serialize(message);
if (!out) {
return out.error();
}
if (state_ == State::kBlocked) {
message_queue_.emplace_back(std::move(out.value()));
return Error::Code::kNone;
}
connection_->Write(out.value().data(), out.value().size());
return Error::Code::kNone;
}
void CastSocket::SetClient(Client* client) {
OSP_DCHECK(client);
client_ = client;
}
std::array<uint8_t, 2> CastSocket::GetSanitizedIpAddress() {
openscreen::IPEndpoint remote = connection_->GetRemoteEndpoint();
std::array<uint8_t, 2> result;
uint8_t bytes[16];
if (remote.address.IsV4()) {
remote.address.CopyToV4(bytes);
result[0] = bytes[2];
result[1] = bytes[3];
} else {
remote.address.CopyToV6(bytes);
result[0] = bytes[14];
result[1] = bytes[15];
}
return result;
}
void CastSocket::OnWriteBlocked(TlsConnection* connection) {
if (state_ == State::kOpen) {
state_ = State::kBlocked;
}
}
void CastSocket::OnWriteUnblocked(TlsConnection* connection) {
if (state_ != State::kBlocked) {
return;
}
state_ = State::kOpen;
// Attempt to write all messages that have been queued-up while the socket was
// blocked. Stop if the socket becomes blocked again, or an error occurs.
auto it = message_queue_.begin();
for (const auto end = message_queue_.end();
it != end && state_ == State::kOpen; ++it) {
// The following Write() could transition |state_| to kBlocked or kError.
connection_->Write(it->data(), it->size());
}
message_queue_.erase(message_queue_.begin(), it);
}
void CastSocket::OnError(TlsConnection* connection, Error error) {
state_ = State::kError;
client_->OnError(this, error);
}
void CastSocket::OnRead(TlsConnection* connection, std::vector<uint8_t> block) {
read_buffer_.insert(read_buffer_.end(), block.begin(), block.end());
ErrorOr<DeserializeResult> message_or_error =
message_serialization::TryDeserialize(
absl::Span<uint8_t>(&read_buffer_[0], read_buffer_.size()));
if (!message_or_error) {
return;
}
read_buffer_.erase(read_buffer_.begin(),
read_buffer_.begin() + message_or_error.value().length);
client_->OnMessage(this, std::move(message_or_error.value().message));
}
} // namespace channel
} // namespace cast
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