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esphome/esphome/components/api/api_connection.h
J. Nick Koston 2eb98c19f7 strinferf
2026-01-09 16:43:28 -10:00

765 lines
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#pragma once
#include "esphome/core/defines.h"
#ifdef USE_API
#include "api_frame_helper.h"
#include "api_pb2.h"
#include "api_pb2_service.h"
#include "api_server.h"
#include "esphome/core/application.h"
#include "esphome/core/component.h"
#include "esphome/core/entity_base.h"
#include "esphome/core/string_ref.h"
#include <functional>
#include <vector>
namespace esphome::api {
// Keepalive timeout in milliseconds
static constexpr uint32_t KEEPALIVE_TIMEOUT_MS = 60000;
// Maximum number of entities to process in a single batch during initial state/info sending
// API 1.14+ clients compute object_id client-side, so messages are smaller and we can fit more per batch
// TODO: Remove MAX_INITIAL_PER_BATCH_LEGACY before 2026.7.0 - all clients should support API 1.14 by then
static constexpr size_t MAX_INITIAL_PER_BATCH_LEGACY = 24; // For clients < API 1.14 (includes object_id)
static constexpr size_t MAX_INITIAL_PER_BATCH = 34; // For clients >= API 1.14 (no object_id)
// Verify MAX_MESSAGES_PER_BATCH (defined in api_frame_helper.h) can hold the initial batch
static_assert(MAX_MESSAGES_PER_BATCH >= MAX_INITIAL_PER_BATCH,
"MAX_MESSAGES_PER_BATCH must be >= MAX_INITIAL_PER_BATCH");
class APIConnection final : public APIServerConnection {
public:
friend class APIServer;
friend class ListEntitiesIterator;
APIConnection(std::unique_ptr<socket::Socket> socket, APIServer *parent);
virtual ~APIConnection();
void start();
void loop();
bool send_list_info_done() {
return this->schedule_message_(nullptr, &APIConnection::try_send_list_info_done,
ListEntitiesDoneResponse::MESSAGE_TYPE, ListEntitiesDoneResponse::ESTIMATED_SIZE);
}
#ifdef USE_BINARY_SENSOR
bool send_binary_sensor_state(binary_sensor::BinarySensor *binary_sensor);
#endif
#ifdef USE_COVER
bool send_cover_state(cover::Cover *cover);
void cover_command(const CoverCommandRequest &msg) override;
#endif
#ifdef USE_FAN
bool send_fan_state(fan::Fan *fan);
void fan_command(const FanCommandRequest &msg) override;
#endif
#ifdef USE_LIGHT
bool send_light_state(light::LightState *light);
void light_command(const LightCommandRequest &msg) override;
#endif
#ifdef USE_SENSOR
bool send_sensor_state(sensor::Sensor *sensor);
#endif
#ifdef USE_SWITCH
bool send_switch_state(switch_::Switch *a_switch);
void switch_command(const SwitchCommandRequest &msg) override;
#endif
#ifdef USE_TEXT_SENSOR
bool send_text_sensor_state(text_sensor::TextSensor *text_sensor);
#endif
#ifdef USE_CAMERA
void set_camera_state(std::shared_ptr<camera::CameraImage> image);
void camera_image(const CameraImageRequest &msg) override;
#endif
#ifdef USE_CLIMATE
bool send_climate_state(climate::Climate *climate);
void climate_command(const ClimateCommandRequest &msg) override;
#endif
#ifdef USE_NUMBER
bool send_number_state(number::Number *number);
void number_command(const NumberCommandRequest &msg) override;
#endif
#ifdef USE_DATETIME_DATE
bool send_date_state(datetime::DateEntity *date);
void date_command(const DateCommandRequest &msg) override;
#endif
#ifdef USE_DATETIME_TIME
bool send_time_state(datetime::TimeEntity *time);
void time_command(const TimeCommandRequest &msg) override;
#endif
#ifdef USE_DATETIME_DATETIME
bool send_datetime_state(datetime::DateTimeEntity *datetime);
void datetime_command(const DateTimeCommandRequest &msg) override;
#endif
#ifdef USE_TEXT
bool send_text_state(text::Text *text);
void text_command(const TextCommandRequest &msg) override;
#endif
#ifdef USE_SELECT
bool send_select_state(select::Select *select);
void select_command(const SelectCommandRequest &msg) override;
#endif
#ifdef USE_BUTTON
void button_command(const ButtonCommandRequest &msg) override;
#endif
#ifdef USE_LOCK
bool send_lock_state(lock::Lock *a_lock);
void lock_command(const LockCommandRequest &msg) override;
#endif
#ifdef USE_VALVE
bool send_valve_state(valve::Valve *valve);
void valve_command(const ValveCommandRequest &msg) override;
#endif
#ifdef USE_MEDIA_PLAYER
bool send_media_player_state(media_player::MediaPlayer *media_player);
void media_player_command(const MediaPlayerCommandRequest &msg) override;
#endif
bool try_send_log_message(int level, const char *tag, const char *line, size_t message_len);
#ifdef USE_API_HOMEASSISTANT_SERVICES
void send_homeassistant_action(const HomeassistantActionRequest &call) {
if (!this->flags_.service_call_subscription)
return;
this->send_message(call, HomeassistantActionRequest::MESSAGE_TYPE);
}
#ifdef USE_API_HOMEASSISTANT_ACTION_RESPONSES
void on_homeassistant_action_response(const HomeassistantActionResponse &msg) override;
#endif // USE_API_HOMEASSISTANT_ACTION_RESPONSES
#endif // USE_API_HOMEASSISTANT_SERVICES
#ifdef USE_BLUETOOTH_PROXY
void subscribe_bluetooth_le_advertisements(const SubscribeBluetoothLEAdvertisementsRequest &msg) override;
void unsubscribe_bluetooth_le_advertisements(const UnsubscribeBluetoothLEAdvertisementsRequest &msg) override;
void bluetooth_device_request(const BluetoothDeviceRequest &msg) override;
void bluetooth_gatt_read(const BluetoothGATTReadRequest &msg) override;
void bluetooth_gatt_write(const BluetoothGATTWriteRequest &msg) override;
void bluetooth_gatt_read_descriptor(const BluetoothGATTReadDescriptorRequest &msg) override;
void bluetooth_gatt_write_descriptor(const BluetoothGATTWriteDescriptorRequest &msg) override;
void bluetooth_gatt_get_services(const BluetoothGATTGetServicesRequest &msg) override;
void bluetooth_gatt_notify(const BluetoothGATTNotifyRequest &msg) override;
bool send_subscribe_bluetooth_connections_free_response(const SubscribeBluetoothConnectionsFreeRequest &msg) override;
void bluetooth_scanner_set_mode(const BluetoothScannerSetModeRequest &msg) override;
#endif
#ifdef USE_HOMEASSISTANT_TIME
void send_time_request() {
GetTimeRequest req;
this->send_message(req, GetTimeRequest::MESSAGE_TYPE);
}
#endif
#ifdef USE_VOICE_ASSISTANT
void subscribe_voice_assistant(const SubscribeVoiceAssistantRequest &msg) override;
void on_voice_assistant_response(const VoiceAssistantResponse &msg) override;
void on_voice_assistant_event_response(const VoiceAssistantEventResponse &msg) override;
void on_voice_assistant_audio(const VoiceAssistantAudio &msg) override;
void on_voice_assistant_timer_event_response(const VoiceAssistantTimerEventResponse &msg) override;
void on_voice_assistant_announce_request(const VoiceAssistantAnnounceRequest &msg) override;
bool send_voice_assistant_get_configuration_response(const VoiceAssistantConfigurationRequest &msg) override;
void voice_assistant_set_configuration(const VoiceAssistantSetConfiguration &msg) override;
#endif
#ifdef USE_ZWAVE_PROXY
void zwave_proxy_frame(const ZWaveProxyFrame &msg) override;
void zwave_proxy_request(const ZWaveProxyRequest &msg) override;
#endif
#ifdef USE_ALARM_CONTROL_PANEL
bool send_alarm_control_panel_state(alarm_control_panel::AlarmControlPanel *a_alarm_control_panel);
void alarm_control_panel_command(const AlarmControlPanelCommandRequest &msg) override;
#endif
#ifdef USE_WATER_HEATER
bool send_water_heater_state(water_heater::WaterHeater *water_heater);
void on_water_heater_command_request(const WaterHeaterCommandRequest &msg) override;
#endif
#ifdef USE_EVENT
void send_event(event::Event *event, StringRef event_type);
#endif
#ifdef USE_UPDATE
bool send_update_state(update::UpdateEntity *update);
void update_command(const UpdateCommandRequest &msg) override;
#endif
void on_disconnect_response(const DisconnectResponse &value) override;
void on_ping_response(const PingResponse &value) override {
// we initiated ping
this->flags_.sent_ping = false;
}
#ifdef USE_API_HOMEASSISTANT_STATES
void on_home_assistant_state_response(const HomeAssistantStateResponse &msg) override;
#endif
#ifdef USE_HOMEASSISTANT_TIME
void on_get_time_response(const GetTimeResponse &value) override;
#endif
bool send_hello_response(const HelloRequest &msg) override;
bool send_disconnect_response(const DisconnectRequest &msg) override;
bool send_ping_response(const PingRequest &msg) override;
bool send_device_info_response(const DeviceInfoRequest &msg) override;
void list_entities(const ListEntitiesRequest &msg) override { this->begin_iterator_(ActiveIterator::LIST_ENTITIES); }
void subscribe_states(const SubscribeStatesRequest &msg) override {
this->flags_.state_subscription = true;
// Start initial state iterator only if no iterator is active
// If list_entities is running, we'll start initial_state when it completes
if (this->active_iterator_ == ActiveIterator::NONE) {
this->begin_iterator_(ActiveIterator::INITIAL_STATE);
}
}
void subscribe_logs(const SubscribeLogsRequest &msg) override {
this->flags_.log_subscription = msg.level;
if (msg.dump_config)
App.schedule_dump_config();
}
#ifdef USE_API_HOMEASSISTANT_SERVICES
void subscribe_homeassistant_services(const SubscribeHomeassistantServicesRequest &msg) override {
this->flags_.service_call_subscription = true;
}
#endif
#ifdef USE_API_HOMEASSISTANT_STATES
void subscribe_home_assistant_states(const SubscribeHomeAssistantStatesRequest &msg) override;
#endif
#ifdef USE_API_USER_DEFINED_ACTIONS
void execute_service(const ExecuteServiceRequest &msg) override;
#ifdef USE_API_USER_DEFINED_ACTION_RESPONSES
void send_execute_service_response(uint32_t call_id, bool success, StringRef error_message);
#ifdef USE_API_USER_DEFINED_ACTION_RESPONSES_JSON
void send_execute_service_response(uint32_t call_id, bool success, StringRef error_message,
const uint8_t *response_data, size_t response_data_len);
#endif // USE_API_USER_DEFINED_ACTION_RESPONSES_JSON
#endif // USE_API_USER_DEFINED_ACTION_RESPONSES
#endif
#ifdef USE_API_NOISE
bool send_noise_encryption_set_key_response(const NoiseEncryptionSetKeyRequest &msg) override;
#endif
bool is_authenticated() override {
return static_cast<ConnectionState>(this->flags_.connection_state) == ConnectionState::AUTHENTICATED;
}
bool is_connection_setup() override {
return static_cast<ConnectionState>(this->flags_.connection_state) == ConnectionState::CONNECTED ||
this->is_authenticated();
}
uint8_t get_log_subscription_level() const { return this->flags_.log_subscription; }
// Get client API version for feature detection
bool client_supports_api_version(uint16_t major, uint16_t minor) const {
return this->client_api_version_major_ > major ||
(this->client_api_version_major_ == major && this->client_api_version_minor_ >= minor);
}
void on_fatal_error() override;
void on_no_setup_connection() override;
ProtoWriteBuffer create_buffer(uint32_t reserve_size) override {
// FIXME: ensure no recursive writes can happen
// Get header padding size - used for both reserve and insert
uint8_t header_padding = this->helper_->frame_header_padding();
// Get shared buffer from parent server
std::vector<uint8_t> &shared_buf = this->parent_->get_shared_buffer_ref();
this->prepare_first_message_buffer(shared_buf, header_padding,
reserve_size + header_padding + this->helper_->frame_footer_size());
return {&shared_buf};
}
void prepare_first_message_buffer(std::vector<uint8_t> &shared_buf, size_t header_padding, size_t total_size) {
shared_buf.clear();
// Reserve space for header padding + message + footer
// - Header padding: space for protocol headers (7 bytes for Noise, 6 for Plaintext)
// - Footer: space for MAC (16 bytes for Noise, 0 for Plaintext)
shared_buf.reserve(total_size);
// Resize to add header padding so message encoding starts at the correct position
shared_buf.resize(header_padding);
}
bool try_to_clear_buffer(bool log_out_of_space);
bool send_buffer(ProtoWriteBuffer buffer, uint8_t message_type) override;
const char *get_name() const { return this->helper_->get_client_name(); }
/// Get peer name (IP address) - cached at connection init time
const char *get_peername() const { return this->helper_->get_client_peername(); }
protected:
// Helper function to handle authentication completion
void complete_authentication_();
#ifdef USE_CAMERA
void try_send_camera_image_();
#endif
#ifdef USE_API_HOMEASSISTANT_STATES
void process_state_subscriptions_();
#endif
// Non-template helper to encode any ProtoMessage
static uint16_t encode_message_to_buffer(ProtoMessage &msg, uint8_t message_type, APIConnection *conn,
uint32_t remaining_size, bool is_single);
// Helper to fill entity state base and encode message
static uint16_t fill_and_encode_entity_state(EntityBase *entity, StateResponseProtoMessage &msg, uint8_t message_type,
APIConnection *conn, uint32_t remaining_size, bool is_single) {
msg.key = entity->get_object_id_hash();
#ifdef USE_DEVICES
msg.device_id = entity->get_device_id();
#endif
return encode_message_to_buffer(msg, message_type, conn, remaining_size, is_single);
}
// Helper to fill entity info base and encode message
static uint16_t fill_and_encode_entity_info(EntityBase *entity, InfoResponseProtoMessage &msg, uint8_t message_type,
APIConnection *conn, uint32_t remaining_size, bool is_single) {
// Set common fields that are shared by all entity types
msg.key = entity->get_object_id_hash();
// API 1.14+ clients compute object_id client-side from the entity name
// For older clients, we must send object_id for backward compatibility
// See: https://github.com/esphome/backlog/issues/76
// TODO: Remove this backward compat code before 2026.7.0 - all clients should support API 1.14 by then
// Buffer must remain in scope until encode_message_to_buffer is called
char object_id_buf[OBJECT_ID_MAX_LEN];
if (!conn->client_supports_api_version(1, 14)) {
msg.object_id = entity->get_object_id_to(object_id_buf);
}
if (entity->has_own_name()) {
msg.name = entity->get_name();
}
// Set common EntityBase properties
#ifdef USE_ENTITY_ICON
msg.icon = entity->get_icon_ref();
#endif
msg.disabled_by_default = entity->is_disabled_by_default();
msg.entity_category = static_cast<enums::EntityCategory>(entity->get_entity_category());
#ifdef USE_DEVICES
msg.device_id = entity->get_device_id();
#endif
return encode_message_to_buffer(msg, message_type, conn, remaining_size, is_single);
}
#ifdef USE_VOICE_ASSISTANT
// Helper to check voice assistant validity and connection ownership
inline bool check_voice_assistant_api_connection_() const;
#endif
// Get the max batch size based on client API version
// API 1.14+ clients don't receive object_id, so messages are smaller and more fit per batch
// TODO: Remove this method before 2026.7.0 and use MAX_INITIAL_PER_BATCH directly
size_t get_max_batch_size_() const {
return this->client_supports_api_version(1, 14) ? MAX_INITIAL_PER_BATCH : MAX_INITIAL_PER_BATCH_LEGACY;
}
// Helper method to process multiple entities from an iterator in a batch
template<typename Iterator> void process_iterator_batch_(Iterator &iterator) {
size_t initial_size = this->deferred_batch_.size();
size_t max_batch = this->get_max_batch_size_();
while (!iterator.completed() && (this->deferred_batch_.size() - initial_size) < max_batch) {
iterator.advance();
}
// If the batch is full, process it immediately
// Note: iterator.advance() already calls schedule_batch_() via schedule_message_()
if (this->deferred_batch_.size() >= max_batch) {
this->process_batch_();
}
}
#ifdef USE_BINARY_SENSOR
static uint16_t try_send_binary_sensor_state(EntityBase *entity, APIConnection *conn, uint32_t remaining_size,
bool is_single);
static uint16_t try_send_binary_sensor_info(EntityBase *entity, APIConnection *conn, uint32_t remaining_size,
bool is_single);
#endif
#ifdef USE_COVER
static uint16_t try_send_cover_state(EntityBase *entity, APIConnection *conn, uint32_t remaining_size,
bool is_single);
static uint16_t try_send_cover_info(EntityBase *entity, APIConnection *conn, uint32_t remaining_size, bool is_single);
#endif
#ifdef USE_FAN
static uint16_t try_send_fan_state(EntityBase *entity, APIConnection *conn, uint32_t remaining_size, bool is_single);
static uint16_t try_send_fan_info(EntityBase *entity, APIConnection *conn, uint32_t remaining_size, bool is_single);
#endif
#ifdef USE_LIGHT
static uint16_t try_send_light_state(EntityBase *entity, APIConnection *conn, uint32_t remaining_size,
bool is_single);
static uint16_t try_send_light_info(EntityBase *entity, APIConnection *conn, uint32_t remaining_size, bool is_single);
#endif
#ifdef USE_SENSOR
static uint16_t try_send_sensor_state(EntityBase *entity, APIConnection *conn, uint32_t remaining_size,
bool is_single);
static uint16_t try_send_sensor_info(EntityBase *entity, APIConnection *conn, uint32_t remaining_size,
bool is_single);
#endif
#ifdef USE_SWITCH
static uint16_t try_send_switch_state(EntityBase *entity, APIConnection *conn, uint32_t remaining_size,
bool is_single);
static uint16_t try_send_switch_info(EntityBase *entity, APIConnection *conn, uint32_t remaining_size,
bool is_single);
#endif
#ifdef USE_TEXT_SENSOR
static uint16_t try_send_text_sensor_state(EntityBase *entity, APIConnection *conn, uint32_t remaining_size,
bool is_single);
static uint16_t try_send_text_sensor_info(EntityBase *entity, APIConnection *conn, uint32_t remaining_size,
bool is_single);
#endif
#ifdef USE_CLIMATE
static uint16_t try_send_climate_state(EntityBase *entity, APIConnection *conn, uint32_t remaining_size,
bool is_single);
static uint16_t try_send_climate_info(EntityBase *entity, APIConnection *conn, uint32_t remaining_size,
bool is_single);
#endif
#ifdef USE_NUMBER
static uint16_t try_send_number_state(EntityBase *entity, APIConnection *conn, uint32_t remaining_size,
bool is_single);
static uint16_t try_send_number_info(EntityBase *entity, APIConnection *conn, uint32_t remaining_size,
bool is_single);
#endif
#ifdef USE_DATETIME_DATE
static uint16_t try_send_date_state(EntityBase *entity, APIConnection *conn, uint32_t remaining_size, bool is_single);
static uint16_t try_send_date_info(EntityBase *entity, APIConnection *conn, uint32_t remaining_size, bool is_single);
#endif
#ifdef USE_DATETIME_TIME
static uint16_t try_send_time_state(EntityBase *entity, APIConnection *conn, uint32_t remaining_size, bool is_single);
static uint16_t try_send_time_info(EntityBase *entity, APIConnection *conn, uint32_t remaining_size, bool is_single);
#endif
#ifdef USE_DATETIME_DATETIME
static uint16_t try_send_datetime_state(EntityBase *entity, APIConnection *conn, uint32_t remaining_size,
bool is_single);
static uint16_t try_send_datetime_info(EntityBase *entity, APIConnection *conn, uint32_t remaining_size,
bool is_single);
#endif
#ifdef USE_TEXT
static uint16_t try_send_text_state(EntityBase *entity, APIConnection *conn, uint32_t remaining_size, bool is_single);
static uint16_t try_send_text_info(EntityBase *entity, APIConnection *conn, uint32_t remaining_size, bool is_single);
#endif
#ifdef USE_SELECT
static uint16_t try_send_select_state(EntityBase *entity, APIConnection *conn, uint32_t remaining_size,
bool is_single);
static uint16_t try_send_select_info(EntityBase *entity, APIConnection *conn, uint32_t remaining_size,
bool is_single);
#endif
#ifdef USE_BUTTON
static uint16_t try_send_button_info(EntityBase *entity, APIConnection *conn, uint32_t remaining_size,
bool is_single);
#endif
#ifdef USE_LOCK
static uint16_t try_send_lock_state(EntityBase *entity, APIConnection *conn, uint32_t remaining_size, bool is_single);
static uint16_t try_send_lock_info(EntityBase *entity, APIConnection *conn, uint32_t remaining_size, bool is_single);
#endif
#ifdef USE_VALVE
static uint16_t try_send_valve_state(EntityBase *entity, APIConnection *conn, uint32_t remaining_size,
bool is_single);
static uint16_t try_send_valve_info(EntityBase *entity, APIConnection *conn, uint32_t remaining_size, bool is_single);
#endif
#ifdef USE_MEDIA_PLAYER
static uint16_t try_send_media_player_state(EntityBase *entity, APIConnection *conn, uint32_t remaining_size,
bool is_single);
static uint16_t try_send_media_player_info(EntityBase *entity, APIConnection *conn, uint32_t remaining_size,
bool is_single);
#endif
#ifdef USE_ALARM_CONTROL_PANEL
static uint16_t try_send_alarm_control_panel_state(EntityBase *entity, APIConnection *conn, uint32_t remaining_size,
bool is_single);
static uint16_t try_send_alarm_control_panel_info(EntityBase *entity, APIConnection *conn, uint32_t remaining_size,
bool is_single);
#endif
#ifdef USE_WATER_HEATER
static uint16_t try_send_water_heater_state(EntityBase *entity, APIConnection *conn, uint32_t remaining_size,
bool is_single);
static uint16_t try_send_water_heater_info(EntityBase *entity, APIConnection *conn, uint32_t remaining_size,
bool is_single);
#endif
#ifdef USE_EVENT
static uint16_t try_send_event_response(event::Event *event, StringRef event_type, APIConnection *conn,
uint32_t remaining_size, bool is_single);
static uint16_t try_send_event_info(EntityBase *entity, APIConnection *conn, uint32_t remaining_size, bool is_single);
#endif
#ifdef USE_UPDATE
static uint16_t try_send_update_state(EntityBase *entity, APIConnection *conn, uint32_t remaining_size,
bool is_single);
static uint16_t try_send_update_info(EntityBase *entity, APIConnection *conn, uint32_t remaining_size,
bool is_single);
#endif
#ifdef USE_CAMERA
static uint16_t try_send_camera_info(EntityBase *entity, APIConnection *conn, uint32_t remaining_size,
bool is_single);
#endif
// Method for ListEntitiesDone batching
static uint16_t try_send_list_info_done(EntityBase *entity, APIConnection *conn, uint32_t remaining_size,
bool is_single);
// Method for DisconnectRequest batching
static uint16_t try_send_disconnect_request(EntityBase *entity, APIConnection *conn, uint32_t remaining_size,
bool is_single);
// Batch message method for ping requests
static uint16_t try_send_ping_request(EntityBase *entity, APIConnection *conn, uint32_t remaining_size,
bool is_single);
// === Optimal member ordering for 32-bit systems ===
// Group 1: Pointers (4 bytes each on 32-bit)
std::unique_ptr<APIFrameHelper> helper_;
APIServer *parent_;
// Group 2: Iterator union (saves ~16 bytes vs separate iterators)
// These iterators are never active simultaneously - list_entities runs to completion
// before initial_state begins, so we use a union with explicit construction/destruction.
enum class ActiveIterator : uint8_t { NONE, LIST_ENTITIES, INITIAL_STATE };
union IteratorUnion {
ListEntitiesIterator list_entities;
InitialStateIterator initial_state;
// Constructor/destructor do nothing - use placement new/explicit destructor
IteratorUnion() {}
~IteratorUnion() {}
} iterator_storage_;
// Helper methods for iterator lifecycle management
void destroy_active_iterator_();
void begin_iterator_(ActiveIterator type);
#ifdef USE_CAMERA
std::unique_ptr<camera::CameraImageReader> image_reader_;
#endif
// Group 3: 4-byte types
uint32_t last_traffic_;
#ifdef USE_API_HOMEASSISTANT_STATES
int state_subs_at_ = -1;
#endif
// Function pointer type for message encoding
using MessageCreatorPtr = uint16_t (*)(EntityBase *, APIConnection *, uint32_t remaining_size, bool is_single);
class MessageCreator {
public:
MessageCreator(MessageCreatorPtr ptr) { data_.function_ptr = ptr; }
explicit MessageCreator(const char *str_value) { data_.const_char_ptr = str_value; }
// Call operator - uses message_type to determine union type
uint16_t operator()(EntityBase *entity, APIConnection *conn, uint32_t remaining_size, bool is_single,
uint8_t message_type) const;
private:
union Data {
MessageCreatorPtr function_ptr;
const char *const_char_ptr;
} data_; // 4 bytes on 32-bit, 8 bytes on 64-bit
};
// Generic batching mechanism for both state updates and entity info
struct DeferredBatch {
struct BatchItem {
EntityBase *entity; // Entity pointer
MessageCreator creator; // Function that creates the message when needed
uint8_t message_type; // Message type for overhead calculation (max 255)
uint8_t estimated_size; // Estimated message size (max 255 bytes)
// Constructor for creating BatchItem
BatchItem(EntityBase *entity, MessageCreator creator, uint8_t message_type, uint8_t estimated_size)
: entity(entity), creator(creator), message_type(message_type), estimated_size(estimated_size) {}
};
std::vector<BatchItem> items;
uint32_t batch_start_time{0};
// No pre-allocation - log connections never use batching, and for
// connections that do, buffers are released after initial sync anyway
// Add item to the batch
void add_item(EntityBase *entity, MessageCreator creator, uint8_t message_type, uint8_t estimated_size);
// Add item to the front of the batch (for high priority messages like ping)
void add_item_front(EntityBase *entity, MessageCreator creator, uint8_t message_type, uint8_t estimated_size);
// Clear all items
void clear() {
items.clear();
batch_start_time = 0;
}
// Remove processed items from the front
void remove_front(size_t count) { items.erase(items.begin(), items.begin() + count); }
bool empty() const { return items.empty(); }
size_t size() const { return items.size(); }
const BatchItem &operator[](size_t index) const { return items[index]; }
// Release excess capacity - only releases if items already empty
void release_buffer() {
// Safe to call: batch is processed before release_buffer is called,
// and if any items remain (partial processing), we must not clear them.
// Use swap trick since shrink_to_fit() is non-binding and may be ignored.
if (items.empty()) {
std::vector<BatchItem>().swap(items);
}
}
};
// DeferredBatch here (16 bytes, 4-byte aligned)
DeferredBatch deferred_batch_;
// ConnectionState enum for type safety
enum class ConnectionState : uint8_t {
WAITING_FOR_HELLO = 0,
CONNECTED = 1,
AUTHENTICATED = 2,
};
// Group 5: Pack all small members together to minimize padding
// This group starts at a 4-byte boundary after DeferredBatch
struct APIFlags {
// Connection state only needs 2 bits (3 states)
uint8_t connection_state : 2;
// Log subscription needs 3 bits (log levels 0-7)
uint8_t log_subscription : 3;
// Boolean flags (1 bit each)
uint8_t remove : 1;
uint8_t state_subscription : 1;
uint8_t sent_ping : 1;
uint8_t service_call_subscription : 1;
uint8_t next_close : 1;
uint8_t batch_scheduled : 1;
uint8_t batch_first_message : 1; // For batch buffer allocation
uint8_t should_try_send_immediately : 1; // True after initial states are sent
#ifdef HAS_PROTO_MESSAGE_DUMP
uint8_t log_only_mode : 1;
#endif
} flags_{}; // 2 bytes total
// 2-byte types immediately after flags_ (no padding between them)
uint16_t client_api_version_major_{0};
uint16_t client_api_version_minor_{0};
// 1-byte type to fill padding
ActiveIterator active_iterator_{ActiveIterator::NONE};
// Total: 2 (flags) + 2 + 2 + 1 = 7 bytes, then 1 byte padding to next 4-byte boundary
uint32_t get_batch_delay_ms_() const;
// Message will use 8 more bytes than the minimum size, and typical
// MTU is 1500. Sometimes users will see as low as 1460 MTU.
// If its IPv6 the header is 40 bytes, and if its IPv4
// the header is 20 bytes. So we have 1460 - 40 = 1420 bytes
// available for the payload. But we also need to add the size of
// the protobuf overhead, which is 8 bytes.
//
// To be safe we pick 1390 bytes as the maximum size
// to send in one go. This is the maximum size of a single packet
// that can be sent over the network.
// This is to avoid fragmentation of the packet.
static constexpr size_t MAX_BATCH_PACKET_SIZE = 1390; // MTU
bool schedule_batch_();
void process_batch_();
void clear_batch_() {
this->deferred_batch_.clear();
this->flags_.batch_scheduled = false;
}
#ifdef HAS_PROTO_MESSAGE_DUMP
// Helper to log a proto message from a MessageCreator object
void log_proto_message_(EntityBase *entity, const MessageCreator &creator, uint8_t message_type) {
this->flags_.log_only_mode = true;
creator(entity, this, MAX_BATCH_PACKET_SIZE, true, message_type);
this->flags_.log_only_mode = false;
}
void log_batch_item_(const DeferredBatch::BatchItem &item) {
// Use the helper to log the message
this->log_proto_message_(item.entity, item.creator, item.message_type);
}
#endif
// Helper to check if a message type should bypass batching
// Returns true if:
// 1. It's an UpdateStateResponse (always send immediately to handle cases where
// the main loop is blocked, e.g., during OTA updates)
// 2. It's an EventResponse (events are edge-triggered - every occurrence matters)
// 3. OR: User has opted into immediate sending (should_try_send_immediately = true
// AND batch_delay = 0)
inline bool should_send_immediately_(uint8_t message_type) const {
return (
#ifdef USE_UPDATE
message_type == UpdateStateResponse::MESSAGE_TYPE ||
#endif
#ifdef USE_EVENT
message_type == EventResponse::MESSAGE_TYPE ||
#endif
(this->flags_.should_try_send_immediately && this->get_batch_delay_ms_() == 0));
}
// Helper method to send a message either immediately or via batching
// Tries immediate send if should_send_immediately_() returns true and buffer has space
// Falls back to batching if immediate send fails or isn't applicable
bool send_message_smart_(EntityBase *entity, MessageCreatorPtr creator, uint8_t message_type,
uint8_t estimated_size) {
if (this->should_send_immediately_(message_type) && this->helper_->can_write_without_blocking()) {
// Now actually encode and send
if (creator(entity, this, MAX_BATCH_PACKET_SIZE, true) &&
this->send_buffer(ProtoWriteBuffer{&this->parent_->get_shared_buffer_ref()}, message_type)) {
#ifdef HAS_PROTO_MESSAGE_DUMP
// Log the message in verbose mode
this->log_proto_message_(entity, MessageCreator(creator), message_type);
#endif
return true;
}
// If immediate send failed, fall through to batching
}
// Fall back to scheduled batching
return this->schedule_message_(entity, creator, message_type, estimated_size);
}
// Overload for MessageCreator (used by events which need to capture event_type)
bool send_message_smart_(EntityBase *entity, MessageCreator creator, uint8_t message_type, uint8_t estimated_size) {
// Try to send immediately if message type should bypass batching and buffer has space
if (this->should_send_immediately_(message_type) && this->helper_->can_write_without_blocking()) {
// Now actually encode and send
if (creator(entity, this, MAX_BATCH_PACKET_SIZE, true, message_type) &&
this->send_buffer(ProtoWriteBuffer{&this->parent_->get_shared_buffer_ref()}, message_type)) {
#ifdef HAS_PROTO_MESSAGE_DUMP
// Log the message in verbose mode
this->log_proto_message_(entity, creator, message_type);
#endif
return true;
}
// If immediate send failed, fall through to batching
}
// Fall back to scheduled batching
return this->schedule_message_(entity, creator, message_type, estimated_size);
}
// Helper function to schedule a deferred message with known message type
bool schedule_message_(EntityBase *entity, MessageCreator creator, uint8_t message_type, uint8_t estimated_size) {
this->deferred_batch_.add_item(entity, creator, message_type, estimated_size);
return this->schedule_batch_();
}
// Overload for function pointers (for info messages and current state reads)
bool schedule_message_(EntityBase *entity, MessageCreatorPtr function_ptr, uint8_t message_type,
uint8_t estimated_size) {
return schedule_message_(entity, MessageCreator(function_ptr), message_type, estimated_size);
}
// Helper function to schedule a high priority message at the front of the batch
bool schedule_message_front_(EntityBase *entity, MessageCreatorPtr function_ptr, uint8_t message_type,
uint8_t estimated_size) {
this->deferred_batch_.add_item_front(entity, MessageCreator(function_ptr), message_type, estimated_size);
return this->schedule_batch_();
}
// Helper function to log client messages with name and peername
void log_client_(int level, const LogString *message);
// Helper function to log API errors with errno
void log_warning_(const LogString *message, APIError err);
// Helper to handle fatal errors with logging
inline void fatal_error_with_log_(const LogString *message, APIError err) {
this->on_fatal_error();
this->log_warning_(message, err);
}
};
} // namespace esphome::api
#endif
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