Prevent config corruption by checking whether memory allocation was successfull.

include/WebApi.h

@@ -5,6 +5,7 @@
 #include "WebApi_device.h"
 #include "WebApi_devinfo.h"
 #include "WebApi_dtu.h"
+#include "WebApi_errors.h"
 #include "WebApi_eventlog.h"
 #include "WebApi_firmware.h"
 #include "WebApi_gridprofile.h"
@@ -34,6 +35,8 @@ public:
 
     static void sendTooManyRequests(AsyncWebServerRequest* request);
 
+    static void writeConfig(JsonObject& retMsg, const WebApiError code = WebApiError::GenericSuccess, const String& message = "Settings saved!");
+
 private:
     void loop();
 

include/WebApi_errors.h

@@ -8,6 +8,7 @@ enum WebApiError {
     GenericDataTooLarge,
     GenericParseError,
     GenericValueMissing,
+    GenericWriteFailed,
 
     DtuBase = 2000,
     DtuSerialZero,

src/Configuration.cpp

@@ -26,6 +26,11 @@ bool ConfigurationClass::write()
 
     DynamicJsonDocument doc(JSON_BUFFER_SIZE);
 
+    if (doc.capacity() == 0) {
+        MessageOutput.println("Failed to allocate memory");
+        return false;
+    }
+
     JsonObject cfg = doc.createNestedObject("cfg");
     cfg["version"] = config.Cfg.Version;
     cfg["save_count"] = config.Cfg.SaveCount;
@@ -151,6 +156,12 @@ bool ConfigurationClass::read()
     File f = LittleFS.open(CONFIG_FILENAME, "r", false);
 
     DynamicJsonDocument doc(JSON_BUFFER_SIZE);
+
+    if (doc.capacity() == 0) {
+        MessageOutput.println("Failed to allocate memory");
+        return false;
+    }
+
     // Deserialize the JSON document
     const DeserializationError error = deserializeJson(doc, f);
     if (error) {
@@ -311,6 +322,12 @@ void ConfigurationClass::migrate()
     }
 
     DynamicJsonDocument doc(JSON_BUFFER_SIZE);
+
+    if (doc.capacity() == 0) {
+        MessageOutput.println("Failed to allocate memory");
+        return;
+    }
+
     // Deserialize the JSON document
     const DeserializationError error = deserializeJson(doc, f);
     if (error) {

src/WebApi.cpp

@@ -101,4 +101,16 @@ void WebApiClass::sendTooManyRequests(AsyncWebServerRequest* request)
     request->send(response);
 }
 
+void WebApiClass::writeConfig(JsonObject& retMsg, const WebApiError code, const String& message)
+{
+    if (!Configuration.write()) {
+        retMsg["message"] = "Write failed!";
+        retMsg["code"] = WebApiError::GenericWriteFailed;
+    } else {
+        retMsg["type"] = "success";
+        retMsg["message"] = message;
+        retMsg["code"] = code;
+    }
+}
+
 WebApiClass WebApi;

src/WebApi_device.cpp

@@ -175,11 +175,7 @@ void WebApiDeviceClass::onDeviceAdminPost(AsyncWebServerRequest* request)
     Display.setLanguage(config.Display.Language);
     Display.Diagram().updatePeriod();
 
-    Configuration.write();
-
-    retMsg["type"] = "success";
-    retMsg["message"] = "Settings saved!";
-    retMsg["code"] = WebApiError::GenericSuccess;
+    WebApi.writeConfig(retMsg);
 
     response->setLength();
     request->send(response);

src/WebApi_dtu.cpp

@@ -154,11 +154,8 @@ void WebApiDtuClass::onDtuAdminPost(AsyncWebServerRequest* request)
     config.Dtu.Nrf.PaLevel = root["nrf_palevel"].as<uint8_t>();
     config.Dtu.Cmt.PaLevel = root["cmt_palevel"].as<int8_t>();
     config.Dtu.Cmt.Frequency = root["cmt_frequency"].as<uint32_t>();
-    Configuration.write();
 
-    retMsg["type"] = "success";
-    retMsg["message"] = "Settings saved!";
-    retMsg["code"] = WebApiError::GenericSuccess;
+    WebApi.writeConfig(retMsg);
 
     response->setLength();
     request->send(response);

src/WebApi_inverter.cpp

@@ -167,11 +167,8 @@ void WebApiInverterClass::onInverterAdd(AsyncWebServerRequest* request)
     inverter->Serial = strtoll(root["serial"].as<String>().c_str(), NULL, 16);
 
     strncpy(inverter->Name, root["name"].as<String>().c_str(), INV_MAX_NAME_STRLEN);
-    Configuration.write();
 
-    retMsg["type"] = "success";
-    retMsg["message"] = "Inverter created!";
-    retMsg["code"] = WebApiError::InverterAdded;
+    WebApi.writeConfig(retMsg, WebApiError::InverterAdded, "Inverter created!");
 
     response->setLength();
     request->send(response);
@@ -294,11 +291,7 @@ void WebApiInverterClass::onInverterEdit(AsyncWebServerRequest* request)
         arrayCount++;
     }
 
-    Configuration.write();
-
-    retMsg["type"] = "success";
-    retMsg["code"] = WebApiError::InverterChanged;
-    retMsg["message"] = "Inverter changed!";
+    WebApi.writeConfig(retMsg, WebApiError::InverterChanged, "Inverter changed!");
 
     response->setLength();
     request->send(response);
@@ -395,11 +388,8 @@ void WebApiInverterClass::onInverterDelete(AsyncWebServerRequest* request)
 
     inverter.Serial = 0;
     strncpy(inverter.Name, "", sizeof(inverter.Name));
-    Configuration.write();
 
-    retMsg["type"] = "success";
-    retMsg["message"] = "Inverter deleted!";
-    retMsg["code"] = WebApiError::InverterDeleted;
+    WebApi.writeConfig(retMsg, WebApiError::InverterDeleted, "Inverter deleted!");
 
     response->setLength();
     request->send(response);
@@ -466,11 +456,7 @@ void WebApiInverterClass::onInverterOrder(AsyncWebServerRequest* request)
         order++;
     }
 
-    Configuration.write();
-
-    retMsg["type"] = "success";
-    retMsg["message"] = "Inverter order saved!";
-    retMsg["code"] = WebApiError::InverterOrdered;
+    WebApi.writeConfig(retMsg, WebApiError::InverterOrdered, "Inverter order saved!");
 
     response->setLength();
     request->send(response);

src/WebApi_mqtt.cpp

@@ -334,11 +334,8 @@ void WebApiMqttClass::onMqttAdminPost(AsyncWebServerRequest* request)
     config.Mqtt.Hass.Retain = root["mqtt_hass_retain"].as<bool>();
     config.Mqtt.Hass.IndividualPanels = root["mqtt_hass_individualpanels"].as<bool>();
     strlcpy(config.Mqtt.Hass.Topic, root["mqtt_hass_topic"].as<String>().c_str(), sizeof(config.Mqtt.Hass.Topic));
-    Configuration.write();
 
-    retMsg["type"] = "success";
-    retMsg["message"] = "Settings saved!";
-    retMsg["code"] = WebApiError::GenericSuccess;
+    WebApi.writeConfig(retMsg);
 
     response->setLength();
     request->send(response);

src/WebApi_network.cpp

@@ -238,11 +238,8 @@ void WebApiNetworkClass::onNetworkAdminPost(AsyncWebServerRequest* request)
     }
     config.WiFi.ApTimeout = root["aptimeout"].as<uint>();
     config.Mdns.Enabled = root["mdnsenabled"].as<bool>();
-    Configuration.write();
 
-    retMsg["type"] = "success";
-    retMsg["message"] = "Settings saved!";
-    retMsg["code"] = WebApiError::GenericSuccess;
+    WebApi.writeConfig(retMsg);
 
     response->setLength();
     request->send(response);

src/WebApi_ntp.cpp

@@ -179,11 +179,8 @@ void WebApiNtpClass::onNtpAdminPost(AsyncWebServerRequest* request)
     config.Ntp.Latitude = root["latitude"].as<double>();
     config.Ntp.Longitude = root["longitude"].as<double>();
     config.Ntp.SunsetType = root["sunsettype"].as<uint8_t>();
-    Configuration.write();
 
-    retMsg["type"] = "success";
-    retMsg["message"] = "Settings saved!";
-    retMsg["code"] = WebApiError::GenericSuccess;
+    WebApi.writeConfig(retMsg);
 
     response->setLength();
     request->send(response);

src/WebApi_security.cpp

@@ -101,11 +101,8 @@ void WebApiSecurityClass::onSecurityPost(AsyncWebServerRequest* request)
     CONFIG_T& config = Configuration.get();
     strlcpy(config.Security.Password, root["password"].as<String>().c_str(), sizeof(config.Security.Password));
     config.Security.AllowReadonly = root["allow_readonly"].as<bool>();
-    Configuration.write();
 
-    retMsg["type"] = "success";
-    retMsg["message"] = "Settings saved!";
-    retMsg["code"] = WebApiError::GenericSuccess;
+    WebApi.writeConfig(retMsg);
 
     response->setLength();
     request->send(response);

webapp/src/locales/de.json

@@ -39,6 +39,7 @@
         "1003": "Daten zu groß!",
         "1004": "Fehler beim interpretieren der Daten!",
         "1005": "Benötigte Werte fehlen!",
+        "1006": "Schreiben fehlgeschlagen!",
         "2001": "Die Seriennummer darf nicht 0 sein!",
         "2002": "Das Abfraginterval muss größer als 0 sein!",
         "2003": "Ungültige Sendeleistung angegeben!",

webapp/src/locales/en.json

@@ -39,6 +39,7 @@
         "1003": "Data too large!",
         "1004": "Failed to parse data!",
         "1005": "Values are missing!",
+        "1006": "Write failed!",
         "2001": "Serial cannot be zero!",
         "2002": "Poll interval must be greater zero!",
         "2003": "Invalid power level setting!",

webapp/src/locales/fr.json

@@ -39,6 +39,7 @@
         "1003": "Données trop importantes !",
         "1004": "Échec de l'analyse des données !",
         "1005": "Certaines valeurs sont manquantes !",
+        "1006": "Write failed!",
         "2001": "Le numéro de série ne peut pas être nul !",
         "2002": "L'intervalle de sondage doit être supérieur à zéro !",
         "2003": "Réglage du niveau de puissance invalide !",