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[api] Store Home Assistant state subscriptions in flash instead of heap (#12008)

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This commit is contained in:
J. Nick Koston
2025-12-09 16:26:11 +01:00
committed by GitHub
parent 443f9c3f57
commit 72c74bc0b3
17 changed files with 144 additions and 72 deletions
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esphome/components/api/api_server.h
+20 -2
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@@ -190,16 +190,27 @@ class APIServer : public Component,
#ifdef USE_API_HOMEASSISTANT_STATES
struct HomeAssistantStateSubscription {
std::string entity_id;
optional<std::string> attribute;
const char *entity_id; // Pointer to flash (internal) or heap (external)
const char *attribute; // Pointer to flash or nullptr (nullptr means no attribute)
std::function<void(std::string)> callback;
bool once;
// Dynamic storage for external components using std::string API (custom_api_device.h)
// These are only allocated when using the std::string overload (nullptr for const char* overload)
std::unique_ptr<std::string> entity_id_dynamic_storage;
std::unique_ptr<std::string> attribute_dynamic_storage;
};
// New const char* overload (for internal components - zero allocation)
void subscribe_home_assistant_state(const char *entity_id, const char *attribute, std::function<void(std::string)> f);
void get_home_assistant_state(const char *entity_id, const char *attribute, std::function<void(std::string)> f);
// Existing std::string overload (for custom_api_device.h - heap allocation)
void subscribe_home_assistant_state(std::string entity_id, optional<std::string> attribute,
std::function<void(std::string)> f);
void get_home_assistant_state(std::string entity_id, optional<std::string> attribute,
std::function<void(std::string)> f);
const std::vector<HomeAssistantStateSubscription> &get_state_subs() const;
#endif
#ifdef USE_API_USER_DEFINED_ACTIONS
@@ -220,6 +231,13 @@ class APIServer : public Component,
bool update_noise_psk_(const SavedNoisePsk &new_psk, const LogString *save_log_msg, const LogString *fail_log_msg,
const psk_t &active_psk, bool make_active);
#endif // USE_API_NOISE
#ifdef USE_API_HOMEASSISTANT_STATES
// Helper methods to reduce code duplication
void add_state_subscription_(const char *entity_id, const char *attribute, std::function<void(std::string)> f,
bool once);
void add_state_subscription_(std::string entity_id, optional<std::string> attribute,
std::function<void(std::string)> f, bool once);
#endif // USE_API_HOMEASSISTANT_STATES
// Pointers and pointer-like types first (4 bytes each)
std::unique_ptr<socket::Socket> socket_ = nullptr;
#ifdef USE_API_CLIENT_CONNECTED_TRIGGER