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Code Issues Releases Wiki Activity

[libretiny] Optimize preferences memory usage by replacing vector with unique_ptr

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This commit is contained in:
J. Nick Koston
2025-09-14 23:15:33 -05:00
parent 459ef7f262
commit f8ff00af06
1 changed files with 23 additions and 16 deletions
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39
esphome/components/libretiny/preferences.cpp
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@@ -15,7 +15,14 @@ static const char *const TAG = "lt.preferences";
struct NVSData {
std::string key;
std::vector<uint8_t> data;
std::unique_ptr<uint8_t[]> data;
size_t len;
void set_data(const uint8_t *src, size_t size) {
data = std::make_unique<uint8_t[]>(size);
memcpy(data.get(), src, size);
len = size;
}
};
static std::vector<NVSData> s_pending_save; // NOLINT(cppcoreguidelines-avoid-non-const-global-variables)
@@ -30,15 +37,15 @@ class LibreTinyPreferenceBackend : public ESPPreferenceBackend {
// try find in pending saves and update that
for (auto &obj : s_pending_save) {
if (obj.key == key) {
obj.data.assign(data, data + len);
obj.set_data(data, len);
return true;
}
}
NVSData save{};
save.key = key;
save.data.assign(data, data + len);
s_pending_save.emplace_back(save);
ESP_LOGVV(TAG, "s_pending_save: key: %s, len: %d", key.c_str(), len);
save.set_data(data, len);
s_pending_save.emplace_back(std::move(save));
ESP_LOGVV(TAG, "s_pending_save: key: %s, len: %zu", key.c_str(), len);
return true;
}
@@ -46,11 +53,11 @@ class LibreTinyPreferenceBackend : public ESPPreferenceBackend {
// try find in pending saves and load from that
for (auto &obj : s_pending_save) {
if (obj.key == key) {
if (obj.data.size() != len) {
if (obj.len != len) {
// size mismatch
return false;
}
memcpy(data, obj.data.data(), len);
memcpy(data, obj.data.get(), len);
return true;
}
}
@@ -58,10 +65,10 @@ class LibreTinyPreferenceBackend : public ESPPreferenceBackend {
fdb_blob_make(blob, data, len);
size_t actual_len = fdb_kv_get_blob(db, key.c_str(), blob);
if (actual_len != len) {
ESP_LOGVV(TAG, "NVS length does not match (%u!=%u)", actual_len, len);
ESP_LOGVV(TAG, "NVS length does not match (%zu!=%zu)", actual_len, len);
return false;
} else {
ESP_LOGVV(TAG, "fdb_kv_get_blob: key: %s, len: %d", key.c_str(), len);
ESP_LOGVV(TAG, "fdb_kv_get_blob: key: %s, len: %zu", key.c_str(), len);
}
return true;
}
@@ -101,7 +108,7 @@ class LibreTinyPreferences : public ESPPreferences {
if (s_pending_save.empty())
return true;
ESP_LOGV(TAG, "Saving %d items...", s_pending_save.size());
ESP_LOGV(TAG, "Saving %zu items...", s_pending_save.size());
// goal try write all pending saves even if one fails
int cached = 0, written = 0, failed = 0;
fdb_err_t last_err = FDB_NO_ERR;
@@ -112,11 +119,11 @@ class LibreTinyPreferences : public ESPPreferences {
const auto &save = s_pending_save[i];
ESP_LOGVV(TAG, "Checking if FDB data %s has changed", save.key.c_str());
if (is_changed(&db, save)) {
ESP_LOGV(TAG, "sync: key: %s, len: %d", save.key.c_str(), save.data.size());
fdb_blob_make(&blob, save.data.data(), save.data.size());
ESP_LOGV(TAG, "sync: key: %s, len: %zu", save.key.c_str(), save.len);
fdb_blob_make(&blob, save.data.get(), save.len);
fdb_err_t err = fdb_kv_set_blob(&db, save.key.c_str(), &blob);
if (err != FDB_NO_ERR) {
ESP_LOGV(TAG, "fdb_kv_set_blob('%s', len=%u) failed: %d", save.key.c_str(), save.data.size(), err);
ESP_LOGV(TAG, "fdb_kv_set_blob('%s', len=%zu) failed: %d", save.key.c_str(), save.len, err);
failed++;
last_err = err;
last_key = save.key;
@@ -124,7 +131,7 @@ class LibreTinyPreferences : public ESPPreferences {
}
written++;
} else {
ESP_LOGD(TAG, "FDB data not changed; skipping %s len=%u", save.key.c_str(), save.data.size());
ESP_LOGD(TAG, "FDB data not changed; skipping %s len=%zu", save.key.c_str(), save.len);
cached++;
}
s_pending_save.erase(s_pending_save.begin() + i);
@@ -147,7 +154,7 @@ class LibreTinyPreferences : public ESPPreferences {
}
// Check size first - if different, data has changed
if (kv.value_len != to_save.data.size()) {
if (kv.value_len != to_save.len) {
return true;
}
@@ -161,7 +168,7 @@ class LibreTinyPreferences : public ESPPreferences {
}
// Compare the actual data
return memcmp(to_save.data.data(), stored_data.get(), kv.value_len) != 0;
return memcmp(to_save.data.get(), stored_data.get(), kv.value_len) != 0;
}
bool reset() override {