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chore: reserve string capacity for prometheus metrics

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This commit is contained in:
Jakob
2025-12-12 14:08:47 +01:00
parent dcfd0d5b11
commit c11402195f
2 changed files with 27 additions and 3 deletions
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26
src/core/emsdevice.cpp
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@@ -1699,15 +1699,33 @@ std::string EMSdevice::get_metrics_prometheus(const int8_t tag) {
std::string result;
std::unordered_map<std::string, bool> seen_metrics;
// Helper function to check if a device value type is supported for Prometheus metrics
auto is_supported_type = [](uint8_t type) -> bool {
return type == DeviceValueType::BOOL || type == DeviceValueType::UINT8 || type == DeviceValueType::INT8
|| type == DeviceValueType::UINT16 || type == DeviceValueType::INT16 || type == DeviceValueType::UINT24
|| type == DeviceValueType::UINT32 || type == DeviceValueType::TIME || type == DeviceValueType::ENUM;
};
// Dynamically reserve memory for the result
size_t entity_count = 0;
for (const auto & dv : devicevalues_) {
if (tag >= 0 && tag != dv.tag) {
continue;
}
// only count supported types
if (is_supported_type(dv.type)) {
entity_count++;
}
}
result.reserve(160 * entity_count);
for (auto & dv : devicevalues_) {
if (tag >= 0 && tag != dv.tag) {
continue;
}
// only process number, boolean and enum types
if (dv.type != DeviceValueType::BOOL && dv.type != DeviceValueType::UINT8 && dv.type != DeviceValueType::INT8 && dv.type != DeviceValueType::UINT16
&& dv.type != DeviceValueType::INT16 && dv.type != DeviceValueType::UINT24 && dv.type != DeviceValueType::UINT32 && dv.type != DeviceValueType::TIME
&& dv.type != DeviceValueType::ENUM) {
if (!is_supported_type(dv.type)) {
continue;
}
@@ -1884,6 +1902,8 @@ std::string EMSdevice::get_metrics_prometheus(const int8_t tag) {
result += "\n";
}
result.shrink_to_fit();
return result;
}

4
src/core/system.cpp
View File

@@ -1568,6 +1568,8 @@ std::string System::get_metrics_prometheus() {
std::string result;
std::unordered_map<std::string, bool> seen_metrics;
result.reserve(16000);
// get system data
JsonDocument doc;
JsonObject root = doc.to<JsonObject>();
@@ -1797,6 +1799,8 @@ std::string System::get_metrics_prometheus() {
// process root object
process_object(root, "");
result.shrink_to_fit();
return result;
}