mirror of
https://github.com/kidfromjupiter/nearby.git
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337 lines
11 KiB
C++
337 lines
11 KiB
C++
// Copyright 2023 Google LLC
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// https://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#include "fastpair/message_stream/message_stream.h"
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#include <algorithm>
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#include <memory>
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#include <optional>
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#include <string>
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#include <utility>
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#include <vector>
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#include "absl/time/time.h"
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#include "fastpair/message_stream/message.h"
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#include "internal/platform/bluetooth_utils.h"
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namespace nearby {
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namespace fastpair {
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namespace {
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constexpr uint8_t kCompanionInstalledBit = 0x02;
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constexpr uint8_t kSupportsSilenceBit = 0x01;
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// The default active components response.
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constexpr uint8_t kDefaultComponents = 0;
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constexpr int kModelIdSize = 3;
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constexpr int kBleAddressSize = 6;
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// We don't accept more than `kMaxBatteryLevels` battery values from the
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// provider.
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constexpr int kMaxBatteryLevels = 3;
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constexpr int kUnknownBatteryLevel = 0x7F;
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constexpr absl::Duration kActiveComponentsTimeout = absl::Seconds(1);
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constexpr absl::Duration kRingAckTimeout = absl::Seconds(1);
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MessageStream::BatteryInfo ConvertBatteryInfo(uint8_t battery_value) {
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// The highest bit represents `is_charging`, the rest the battery level (in
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// %).
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bool is_charging = battery_value & 0x80;
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int level = battery_value & 0x7F;
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MessageStream::BatteryInfo battery_info{.is_charging = is_charging};
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if (level != kUnknownBatteryLevel) {
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battery_info.level = level;
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}
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return battery_info;
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}
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} // namespace
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MessageStream::MessageStream(const FastPairDevice& device,
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std::optional<BluetoothClassicMedium*> bt_classic,
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Observer& observer)
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: observer_(observer), medium_(device, bt_classic, *this) {}
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absl::Status MessageStream::OpenRfcomm() { return medium_.OpenRfcomm(); }
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absl::Status MessageStream::OpenL2cap(absl::string_view ble_address) {
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return medium_.OpenL2cap(ble_address);
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}
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absl::Status MessageStream::Disconnect() { return medium_.Disconnect(); }
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Future<uint8_t> MessageStream::GetActiveComponents() {
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Future<uint8_t> future(kActiveComponentsTimeout);
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absl::Status status = medium_.Send(
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Message{.message_group = MessageGroup::kDeviceInformationEvent,
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.message_code = MessageCode::kActiveComponentRequest});
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if (status.ok()) {
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MutexLock lock(&mutex_);
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if (get_active_components_request_) {
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get_active_components_request_->SetException({Exception::kInterrupted});
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}
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get_active_components_request_ = std::make_unique<Future<uint8_t>>(future);
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} else {
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future.SetException({Exception::kIo});
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}
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return future;
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}
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absl::Status MessageStream::SendCapabilities(bool companion_app_installed,
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bool supports_silence_mode) {
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uint8_t capabilites = 0;
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if (companion_app_installed) {
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capabilites |= kCompanionInstalledBit;
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}
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if (supports_silence_mode) {
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capabilites |= kSupportsSilenceBit;
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}
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return medium_.Send(
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Message{.message_group = MessageGroup::kDeviceInformationEvent,
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.message_code = MessageCode::kCapabilites,
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.payload = {capabilites}});
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}
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absl::Status MessageStream::SendPlatformType(
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api::DeviceInfo::OsType platform_type, uint8_t custom_code) {
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return medium_.Send(
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Message{.message_group = MessageGroup::kDeviceInformationEvent,
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.message_code = MessageCode::kPlatformType,
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.payload = {static_cast<uint8_t>(platform_type), custom_code}});
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}
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// Asks the Provider to ring.
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// Returns true if the Provider replies with an ACK.
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Future<bool> MessageStream::Ring(uint8_t components, absl::Duration duration) {
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constexpr MessageGroup kGroup = MessageGroup::kDeviceActionEvent;
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constexpr MessageCode kCode = MessageCode::kRing;
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Future<bool> future(kRingAckTimeout);
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std::string payload = {components};
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uint8_t minutes = absl::ToInt64Minutes(duration);
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if (minutes != 0) {
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payload.append({minutes});
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}
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{
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MutexLock lock(&mutex_);
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waiting_for_ack_.push_back(MessageWithAck{
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.message_group = kGroup, .message_code = kCode, .future = future});
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}
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absl::Status status = medium_.Send(Message{
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.message_group = kGroup, .message_code = kCode, .payload = payload});
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if (!status.ok()) {
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FinishCall(kGroup, kCode, false);
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}
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return future;
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}
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void MessageStream::FinishCall(MessageGroup group, MessageCode code,
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bool result) {
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NEARBY_LOGS(INFO) << "Finish call " << static_cast<int>(group) << ", "
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<< static_cast<int>(code) << " with result: " << result;
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MutexLock lock(&mutex_);
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auto it = std::find_if(waiting_for_ack_.begin(), waiting_for_ack_.end(),
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[&](const MessageWithAck& item) {
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return item.message_group == group &&
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item.message_code == code;
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});
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if (it != waiting_for_ack_.end()) {
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NEARBY_LOGS(INFO) << "Finishing call with result: " << result;
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it->future.Set(result);
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waiting_for_ack_.erase(it);
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}
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}
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// Medium::Observer
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void MessageStream::OnConnectionResult(absl::Status result) {
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observer_.OnConnectionResult(result);
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}
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void MessageStream::OnDisconnected(absl::Status status) {
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observer_.OnDisconnected(status);
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}
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void MessageStream::OnReceived(Message message) {
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bool handled = false;
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NEARBY_LOGS(INFO) << "Received: " << message;
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switch (message.message_group) {
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case MessageGroup::kAcknowledgement:
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handled = HandleAcknowledgement(message);
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break;
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case MessageGroup::kBluetooth:
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handled = HandleBluetooth(message);
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break;
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case MessageGroup::kCompanionAppEvent:
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handled = HandleCompanionAppEvent(message);
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break;
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case MessageGroup::kDeviceInformationEvent:
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handled = HandleDeviceInformationEvent(message);
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break;
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case MessageGroup::kDeviceActionEvent:
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handled = HandleDeviceActionEvent(message);
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break;
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case MessageGroup::kSass:
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break;
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default:
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break;
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}
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if (!handled) {
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NEARBY_LOGS(INFO) << "Unrecognized " << message;
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}
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}
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bool MessageStream::HandleDeviceInformationEvent(const Message& message) {
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switch (message.message_code) {
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case MessageCode::kModelId: {
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if (message.payload.size() != kModelIdSize) {
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NEARBY_LOGS(WARNING) << "Model id event size should be " << kModelIdSize
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<< " but is " << message.payload.size();
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break;
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}
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observer_.OnModelId(message.payload);
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return true;
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}
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case MessageCode::kBleAddressUpdated: {
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if (message.payload.size() != kBleAddressSize) {
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NEARBY_LOGS(WARNING)
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<< "BLE address updated event size should be " << kBleAddressSize
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<< " but is " << message.payload.size();
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break;
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}
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ByteArray address(message.payload);
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observer_.OnBleAddressUpdated(BluetoothUtils::ToString(address));
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return true;
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}
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case MessageCode::kBatteryUpdated: {
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if (message.payload.size() > kMaxBatteryLevels) {
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NEARBY_LOGS(WARNING)
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<< "Battery level event size should be <= " << kMaxBatteryLevels
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<< " but is " << message.payload.size();
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break;
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}
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std::vector<BatteryInfo> battery_levels(message.payload.size());
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for (size_t i = 0; i < message.payload.size(); i++) {
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battery_levels[i] = ConvertBatteryInfo(message.payload[i]);
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}
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observer_.OnBatteryUpdated(std::move(battery_levels));
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return true;
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}
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case MessageCode::kRemainingBatteryTime: {
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int battery_time = 0;
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if (message.payload.size() == 1) {
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battery_time = static_cast<uint8_t>(message.payload[0]);
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} else if (message.payload.size() == 2) {
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battery_time = 256 * static_cast<uint8_t>(message.payload[0]) +
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static_cast<uint8_t>(message.payload[1]);
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} else {
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NEARBY_LOGS(WARNING)
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<< "Remaining battery event size should be 1 or 2 bytes but is "
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<< message.payload.size();
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break;
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}
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observer_.OnRemainingBatteryTime(absl::Minutes(battery_time));
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return true;
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}
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case MessageCode::kActiveComponentResponse: {
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uint8_t components = message.payload.size() == 1
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? message.payload.data()[0]
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: kDefaultComponents;
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MutexLock lock(&mutex_);
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if (get_active_components_request_) {
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get_active_components_request_->Set(components);
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get_active_components_request_.reset();
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}
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return true;
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}
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default:
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break;
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}
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return false;
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}
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bool MessageStream::HandleAcknowledgement(const Message& message) {
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bool result;
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if (message.message_code == MessageCode::kAck) {
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result = true;
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} else if (message.message_code == MessageCode::kNack) {
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result = false;
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} else {
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return false;
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}
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// The payload of ACK/NACK message contains the group/code of the original
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// message.
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if (message.payload.size() < 2) {
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NEARBY_LOGS(INFO) << "ACK/NACK too short: " << message;
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return false;
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}
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MessageGroup group = static_cast<MessageGroup>(message.payload[0]);
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MessageCode code = static_cast<MessageCode>(message.payload[1]);
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FinishCall(group, code, result);
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return true;
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}
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bool MessageStream::HandleBluetooth(const Message& message) {
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switch (message.message_code) {
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case MessageCode::kEnableSilenceMode:
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observer_.OnEnableSilenceMode(true);
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return true;
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case MessageCode::kDisableSilenceMode:
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observer_.OnEnableSilenceMode(false);
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return true;
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default:
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break;
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}
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return false;
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}
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bool MessageStream::HandleCompanionAppEvent(const Message& message) {
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switch (message.message_code) {
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case MessageCode::kLogBufferFull:
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observer_.OnLogBufferFull();
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return true;
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default:
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break;
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}
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return false;
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}
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bool MessageStream::HandleDeviceActionEvent(const Message& message) {
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switch (message.message_code) {
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case MessageCode::kRing: {
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uint8_t components = 0;
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absl::Duration duration = absl::ZeroDuration();
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if (!message.payload.empty()) {
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components = static_cast<uint8_t>(message.payload[0]);
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}
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if (message.payload.size() >= 2) {
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duration = absl::Minutes(static_cast<uint8_t>(message.payload[1]));
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}
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bool result = observer_.OnRing(components, duration);
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SendAcknowledgement(message, result);
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return true;
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}
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default:
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break;
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}
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return false;
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}
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void MessageStream::SendAcknowledgement(const Message& message, bool ack) {
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absl::Status status = medium_.Send(
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Message{.message_group = MessageGroup::kAcknowledgement,
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.message_code = ack ? MessageCode::kAck : MessageCode::kNack,
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.payload = {static_cast<uint8_t>(message.message_group),
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static_cast<uint8_t>(message.message_code)}});
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if (!status.ok()) {
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NEARBY_LOGS(WARNING) << "Failed to send ACK/NACK " << status;
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}
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}
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} // namespace fastpair
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} // namespace nearby
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