add settings

main/settings.cc

@@ -0,0 +1,63 @@
+#include "settings.h"
+
+#include <esp_log.h>
+#include <nvs_flash.h>
+
+#define TAG "Settings"
+
+Settings::Settings(const std::string& ns, bool read_write) : ns_(ns), read_write_(read_write) {
+    nvs_open(ns.c_str(), read_write_ ? NVS_READWRITE : NVS_READONLY, &nvs_handle_);
+}
+
+Settings::~Settings() {
+    if (nvs_handle_ != 0) {
+        if (read_write_) {
+            ESP_ERROR_CHECK(nvs_commit(nvs_handle_));
+        }
+        nvs_close(nvs_handle_);
+    }
+}
+
+std::string Settings::GetString(const std::string& key, const std::string& default_value) {
+    if (nvs_handle_ == 0) {
+        return default_value;
+    }
+
+    size_t length = 0;
+    if (nvs_get_str(nvs_handle_, key.c_str(), nullptr, &length) != ESP_OK) {
+        return default_value;
+    }
+
+    std::string value;
+    value.resize(length);
+    ESP_ERROR_CHECK(nvs_get_str(nvs_handle_, key.c_str(), value.data(), &length));
+    return value;
+}
+
+void Settings::SetString(const std::string& key, const std::string& value) {
+    if (read_write_) {
+        ESP_ERROR_CHECK(nvs_set_str(nvs_handle_, key.c_str(), value.c_str()));
+    } else {
+        ESP_LOGW(TAG, "Namespace %s is not open for writing", ns_.c_str());
+    }
+}
+
+int32_t Settings::GetInt(const std::string& key, int32_t default_value) {
+    if (nvs_handle_ == 0) {
+        return default_value;
+    }
+
+    int32_t value;
+    if (nvs_get_i32(nvs_handle_, key.c_str(), &value) != ESP_OK) {
+        return default_value;
+    }
+    return value;
+}
+
+void Settings::SetInt(const std::string& key, int32_t value) {
+    if (read_write_) {
+        ESP_ERROR_CHECK(nvs_set_i32(nvs_handle_, key.c_str(), value));
+    } else {
+        ESP_LOGW(TAG, "Namespace %s is not open for writing", ns_.c_str());
+    }
+}