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[mdns] Reduce flash usage and prevent RAM over-allocation in service compilation (#10287)

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This commit is contained in:
J. Nick Koston
2025-08-19 21:34:34 -05:00
committed by GitHub
parent 5a1533bea9
commit 9b1ebdb6da
1 changed files with 99 additions and 58 deletions
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157
esphome/components/mdns/mdns_component.cpp
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@@ -24,100 +24,139 @@ static const char *const TAG = "mdns";
void MDNSComponent::compile_records_() {
this->hostname_ = App.get_name();
this->services_.clear();
// Calculate exact capacity needed for services vector
size_t services_count = 0;
#ifdef USE_API
if (api::global_api_server != nullptr) {
MDNSService service{};
services_count++;
}
#endif
#ifdef USE_PROMETHEUS
services_count++;
#endif
#ifdef USE_WEBSERVER
services_count++;
#endif
#ifdef USE_MDNS_EXTRA_SERVICES
services_count += this->services_extra_.size();
#endif
// Reserve for fallback service if needed
if (services_count == 0) {
services_count = 1;
}
this->services_.reserve(services_count);
#ifdef USE_API
if (api::global_api_server != nullptr) {
this->services_.emplace_back();
auto &service = this->services_.back();
service.service_type = "_esphomelib";
service.proto = "_tcp";
service.port = api::global_api_server->get_port();
if (!App.get_friendly_name().empty()) {
service.txt_records.push_back({"friendly_name", App.get_friendly_name()});
}
service.txt_records.push_back({"version", ESPHOME_VERSION});
service.txt_records.push_back({"mac", get_mac_address()});
const char *platform = nullptr;
#ifdef USE_ESP8266
platform = "ESP8266";
#endif
#ifdef USE_ESP32
platform = "ESP32";
#endif
#ifdef USE_RP2040
platform = "RP2040";
#endif
#ifdef USE_LIBRETINY
platform = lt_cpu_get_model_name();
#endif
if (platform != nullptr) {
service.txt_records.push_back({"platform", platform});
}
service.txt_records.push_back({"board", ESPHOME_BOARD});
const std::string &friendly_name = App.get_friendly_name();
bool friendly_name_empty = friendly_name.empty();
// Calculate exact capacity for txt_records
size_t txt_count = 3; // version, mac, board (always present)
if (!friendly_name_empty) {
txt_count++; // friendly_name
}
#if defined(USE_ESP8266) || defined(USE_ESP32) || defined(USE_RP2040) || defined(USE_LIBRETINY)
txt_count++; // platform
#endif
#if defined(USE_WIFI) || defined(USE_ETHERNET) || defined(USE_OPENTHREAD)
txt_count++; // network
#endif
#ifdef USE_API_NOISE
txt_count++; // api_encryption or api_encryption_supported
#endif
#ifdef ESPHOME_PROJECT_NAME
txt_count += 2; // project_name and project_version
#endif
#ifdef USE_DASHBOARD_IMPORT
txt_count++; // package_import_url
#endif
auto &txt_records = service.txt_records;
txt_records.reserve(txt_count);
if (!friendly_name_empty) {
txt_records.emplace_back(MDNSTXTRecord{"friendly_name", friendly_name});
}
txt_records.emplace_back(MDNSTXTRecord{"version", ESPHOME_VERSION});
txt_records.emplace_back(MDNSTXTRecord{"mac", get_mac_address()});
#ifdef USE_ESP8266
txt_records.emplace_back(MDNSTXTRecord{"platform", "ESP8266"});
#elif defined(USE_ESP32)
txt_records.emplace_back(MDNSTXTRecord{"platform", "ESP32"});
#elif defined(USE_RP2040)
txt_records.emplace_back(MDNSTXTRecord{"platform", "RP2040"});
#elif defined(USE_LIBRETINY)
txt_records.emplace_back(MDNSTXTRecord{"platform", lt_cpu_get_model_name()});
#endif
txt_records.emplace_back(MDNSTXTRecord{"board", ESPHOME_BOARD});
#if defined(USE_WIFI)
service.txt_records.push_back({"network", "wifi"});
txt_records.emplace_back(MDNSTXTRecord{"network", "wifi"});
#elif defined(USE_ETHERNET)
service.txt_records.push_back({"network", "ethernet"});
txt_records.emplace_back(MDNSTXTRecord{"network", "ethernet"});
#elif defined(USE_OPENTHREAD)
service.txt_records.push_back({"network", "thread"});
txt_records.emplace_back(MDNSTXTRecord{"network", "thread"});
#endif
#ifdef USE_API_NOISE
static constexpr const char *NOISE_ENCRYPTION = "Noise_NNpsk0_25519_ChaChaPoly_SHA256";
if (api::global_api_server->get_noise_ctx()->has_psk()) {
service.txt_records.push_back({"api_encryption", "Noise_NNpsk0_25519_ChaChaPoly_SHA256"});
txt_records.emplace_back(MDNSTXTRecord{"api_encryption", NOISE_ENCRYPTION});
} else {
service.txt_records.push_back({"api_encryption_supported", "Noise_NNpsk0_25519_ChaChaPoly_SHA256"});
txt_records.emplace_back(MDNSTXTRecord{"api_encryption_supported", NOISE_ENCRYPTION});
}
#endif
#ifdef ESPHOME_PROJECT_NAME
service.txt_records.push_back({"project_name", ESPHOME_PROJECT_NAME});
service.txt_records.push_back({"project_version", ESPHOME_PROJECT_VERSION});
txt_records.emplace_back(MDNSTXTRecord{"project_name", ESPHOME_PROJECT_NAME});
txt_records.emplace_back(MDNSTXTRecord{"project_version", ESPHOME_PROJECT_VERSION});
#endif // ESPHOME_PROJECT_NAME
#ifdef USE_DASHBOARD_IMPORT
service.txt_records.push_back({"package_import_url", dashboard_import::get_package_import_url()});
txt_records.emplace_back(MDNSTXTRecord{"package_import_url", dashboard_import::get_package_import_url()});
#endif
this->services_.push_back(service);
}
#endif // USE_API
#ifdef USE_PROMETHEUS
{
MDNSService service{};
service.service_type = "_prometheus-http";
service.proto = "_tcp";
service.port = USE_WEBSERVER_PORT;
this->services_.push_back(service);
}
this->services_.emplace_back();
auto &prom_service = this->services_.back();
prom_service.service_type = "_prometheus-http";
prom_service.proto = "_tcp";
prom_service.port = USE_WEBSERVER_PORT;
#endif
#ifdef USE_WEBSERVER
{
MDNSService service{};
service.service_type = "_http";
service.proto = "_tcp";
service.port = USE_WEBSERVER_PORT;
this->services_.push_back(service);
}
this->services_.emplace_back();
auto &web_service = this->services_.back();
web_service.service_type = "_http";
web_service.proto = "_tcp";
web_service.port = USE_WEBSERVER_PORT;
#endif
#ifdef USE_MDNS_EXTRA_SERVICES
this->services_.insert(this->services_.end(), this->services_extra_.begin(), this->services_extra_.end());
#endif
if (this->services_.empty()) {
// Publish "http" service if not using native API
// This is just to have *some* mDNS service so that .local resolution works
MDNSService service{};
service.service_type = "_http";
service.proto = "_tcp";
service.port = USE_WEBSERVER_PORT;
service.txt_records.push_back({"version", ESPHOME_VERSION});
this->services_.push_back(service);
}
#if !defined(USE_API) && !defined(USE_PROMETHEUS) && !defined(USE_WEBSERVER) && !defined(USE_MDNS_EXTRA_SERVICES)
// Publish "http" service if not using native API or any other services
// This is just to have *some* mDNS service so that .local resolution works
this->services_.emplace_back();
auto &fallback_service = this->services_.back();
fallback_service.service_type = "_http";
fallback_service.proto = "_tcp";
fallback_service.port = USE_WEBSERVER_PORT;
fallback_service.txt_records.emplace_back(MDNSTXTRecord{"version", ESPHOME_VERSION});
#endif
}
void MDNSComponent::dump_config() {
@@ -125,6 +164,7 @@ void MDNSComponent::dump_config() {
"mDNS:\n"
" Hostname: %s",
this->hostname_.c_str());
#if ESPHOME_LOG_LEVEL >= ESPHOME_LOG_LEVEL_VERY_VERBOSE
ESP_LOGV(TAG, " Services:");
for (const auto &service : this->services_) {
ESP_LOGV(TAG, " - %s, %s, %d", service.service_type.c_str(), service.proto.c_str(),
@@ -134,6 +174,7 @@ void MDNSComponent::dump_config() {
const_cast<TemplatableValue<std::string> &>(record.value).value().c_str());
}
}
#endif
}
std::vector<MDNSService> MDNSComponent::get_services() { return this->services_; }