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memory optimzations

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This commit is contained in:
proddy
2026-01-23 19:37:21 +01:00
parent 9088651e53
commit bfbb18655d
3 changed files with 34 additions and 26 deletions
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16
src/core/shuntingYard.cpp
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@@ -344,8 +344,12 @@ bool isnum(const std::string & s) {
std::string commands(std::string & expr, bool quotes) {
auto expr_new = Helpers::toLower(expr);
for (uint8_t device = 0; device < EMSdevice::DeviceType::UNKNOWN; device++) {
std::string d = (std::string)EMSdevice::device_type_2_device_name(device) + "/";
auto f = expr_new.find(d);
// Optimized: build string with reserve to avoid temporary allocations
std::string d;
d.reserve(32); // typical device name length + "/"
d = EMSdevice::device_type_2_device_name(device);
d += "/";
auto f = expr_new.find(d);
while (f != std::string::npos) {
// entity names are alphanumeric or _
auto e = expr_new.find_first_not_of("/._abcdefghijklmnopqrstuvwxyz0123456789", f);
@@ -367,9 +371,11 @@ std::string commands(std::string & expr, bool quotes) {
JsonDocument doc_in;
JsonObject output = doc_out.to<JsonObject>();
JsonObject input = doc_in.to<JsonObject>();
std::string cmd_s = "api/" + std::string(cmd);
// Optimized: use stack buffer for small strings to avoid heap allocation
char cmd_s[COMMAND_MAX_LENGTH + 5]; // "api/" prefix + cmd
snprintf(cmd_s, sizeof(cmd_s), "api/%s", cmd);
auto return_code = Command::process(cmd_s.c_str(), true, input, output);
auto return_code = Command::process(cmd_s, true, input, output);
// check for no value (entity is valid but has no value set)
if (return_code != CommandRet::OK && return_code != CommandRet::NO_VALUE) {
return expr = "";
@@ -725,7 +731,7 @@ std::string compute(const std::string & expr) {
// if there is data, force a POST
if (value.length() || Helpers::toLower(method) == "post") {
if (value.find_first_of('{') != std::string::npos) {
http.addHeader("Content-Type", "application/json"); // auto-set to JSON
http.addHeader(asyncsrv::T_Content_Type, asyncsrv::T_application_json, false); // auto-set to JSON
}
httpResult = http.POST(value.c_str());
} else {