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[api] Avoid heap string copies in Home Assistant state subscription callbacks (#12506)

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This commit is contained in:
J. Nick Koston
2026-01-05 07:42:18 -10:00
committed by GitHub
parent 6aaaae5d0e
commit fc7e55bfdc
10 changed files with 177 additions and 94 deletions
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36
esphome/components/api/api_server.cpp
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@@ -388,8 +388,8 @@ void APIServer::handle_action_response(uint32_t call_id, bool success, StringRef
#ifdef USE_API_HOMEASSISTANT_STATES
// Helper to add subscription (reduces duplication)
void APIServer::add_state_subscription_(const char *entity_id, const char *attribute,
std::function<void(std::string)> f, bool once) {
void APIServer::add_state_subscription_(const char *entity_id, const char *attribute, std::function<void(StringRef)> f,
bool once) {
this->state_subs_.push_back(HomeAssistantStateSubscription{
.entity_id = entity_id, .attribute = attribute, .callback = std::move(f), .once = once,
// entity_id_dynamic_storage and attribute_dynamic_storage remain nullptr (no heap allocation)
@@ -398,7 +398,7 @@ void APIServer::add_state_subscription_(const char *entity_id, const char *attri
// Helper to add subscription with heap-allocated strings (reduces duplication)
void APIServer::add_state_subscription_(std::string entity_id, optional<std::string> attribute,
std::function<void(std::string)> f, bool once) {
std::function<void(StringRef)> f, bool once) {
HomeAssistantStateSubscription sub;
// Allocate heap storage for the strings
sub.entity_id_dynamic_storage = std::make_unique<std::string>(std::move(entity_id));
@@ -418,23 +418,43 @@ void APIServer::add_state_subscription_(std::string entity_id, optional<std::str
// New const char* overload (for internal components - zero allocation)
void APIServer::subscribe_home_assistant_state(const char *entity_id, const char *attribute,
std::function<void(std::string)> f) {
std::function<void(StringRef)> f) {
this->add_state_subscription_(entity_id, attribute, std::move(f), false);
}
void APIServer::get_home_assistant_state(const char *entity_id, const char *attribute,
std::function<void(std::string)> f) {
std::function<void(StringRef)> f) {
this->add_state_subscription_(entity_id, attribute, std::move(f), true);
}
// Existing std::string overload (for custom_api_device.h - heap allocation)
// std::string overload with StringRef callback (zero-allocation callback)
void APIServer::subscribe_home_assistant_state(std::string entity_id, optional<std::string> attribute,
std::function<void(std::string)> f) {
std::function<void(StringRef)> f) {
this->add_state_subscription_(std::move(entity_id), std::move(attribute), std::move(f), false);
}
void APIServer::get_home_assistant_state(std::string entity_id, optional<std::string> attribute,
std::function<void(std::string)> f) {
std::function<void(StringRef)> f) {
this->add_state_subscription_(std::move(entity_id), std::move(attribute), std::move(f), true);
}
// Legacy helper: wraps std::string callback and delegates to StringRef version
void APIServer::add_state_subscription_(std::string entity_id, optional<std::string> attribute,
std::function<void(const std::string &)> f, bool once) {
// Wrap callback to convert StringRef -> std::string, then delegate
this->add_state_subscription_(std::move(entity_id), std::move(attribute),
std::function<void(StringRef)>([f = std::move(f)](StringRef state) { f(state.str()); }),
once);
}
// Legacy std::string overload (for custom_api_device.h - converts StringRef to std::string)
void APIServer::subscribe_home_assistant_state(std::string entity_id, optional<std::string> attribute,
std::function<void(const std::string &)> f) {
this->add_state_subscription_(std::move(entity_id), std::move(attribute), std::move(f), false);
}
void APIServer::get_home_assistant_state(std::string entity_id, optional<std::string> attribute,
std::function<void(const std::string &)> f) {
this->add_state_subscription_(std::move(entity_id), std::move(attribute), std::move(f), true);
}