Implemented new CSV based USERDB

src/UserDb.cpp

@@ -2,44 +2,70 @@
 
 using namespace userdb;
 
-UserDb::UserDb(){
+UserDb::UserDb()
-
-}
-UserDb::User UserDb::read_csv_line(String instring){
-    int locations[5];
-    int location_index=0;
-    int str_length = instring.length()-1;
-    for(int i = 0; i<str_length;i++){
-        if(instring.charAt(i) == ','){
-            locations[location_index]=i;
-            location_index++;
-        }
-
-    }
-    UserDb::User res;
-    res.uid = instring.substring(0,locations[0]).toInt();
-    res.first_name = instring.substring(locations[0]+1,locations[1]);
-    res.last_name = instring.substring(locations[1]+1,locations[2]);
-    res.rfid_uid = instring.substring(locations[2]+1,locations[3]);
-    res.user_pin = instring.substring(locations[3]+1,locations[4]);
-    res.enabled = instring.charAt(locations[4]+1)=='1'?true:false;
-    return res;
-}
-
-void UserDb::test(){
-    Serial.println("Starting UserDB Read");
-    File userdb_file = LittleFS.open("userdb.csv","r");
-    if (!userdb_file)
 {
-        Serial.println("Failed to open file for reading");
-        return;
-    }
-    unsigned int line = 0;
-    while(userdb_file.available()){
-        String temp = userdb_file.readStringUntil('\n');
-        
-        Serial.println(read_csv_line(temp).toString());
-        line++;
-    }
 }
 
+User UserDb::user_by_pin(String cmp)
+{
+    Serial.println("Stearching for user with pin number " + cmp);
+    Iterator it = begin();
+    do
+    {
+        User temp = *it;
+        if (temp.user_pin == cmp)
+            return temp;
+        ++it;
+    } while (it.has_next());
+    return User{.enabled = false};
+}
+User UserDb::user_by_rfid(String cmp)
+{
+    Serial.println("Stearching for user with rfid " + cmp);
+    Iterator it = begin();
+    do
+    {
+        User temp = *it;
+        if (temp.rfid_uid == cmp)
+            return temp;
+        ++it;
+    } while (it.has_next());
+    return User{.enabled = false};
+}
+
+User UserDb::user_by_uid(unsigned long cmp){
+    Serial.println("Stearching for user with user id " + String(cmp));
+    Iterator it = begin();
+    do
+    {
+        User temp = *it;
+        if (temp.uid == cmp)
+            return temp;
+        ++it;
+    } while (it.has_next());
+    return User{.enabled = false};
+}
+void UserDb::print_to_serial()
+{
+    Serial.println("Starting UserDB Test Read");
+    // File userdb_file = LittleFS.open("userdb.csv","r");
+    // if (!userdb_file)
+    //{
+    //     Serial.println("Failed to open file for reading");
+    //     return;
+    // }
+    // unsigned int line = 0;
+    // while(userdb_file.available()){
+    //     String temp = userdb_file.readStringUntil('\n');
+    //     User res = read_csv_line(temp);
+    //     Serial.println(res.toString());
+    //     line++;
+    // }
+    Iterator it = begin();
+    do
+    {
+        User temp = *it;
+        Serial.println(temp.toString());
+        ++it;
+    } while (it.has_next());
+}

src/UserDb.h

@@ -2,21 +2,26 @@
 #include "Persistence.h"
 #include "LittleFS.h"
 #include <sstream>
+#include <iterator>
+#include <cstddef>
+
 namespace userdb
 {
-    class UserDb
+    enum USERATTRIBUTES
     {
-    private:
+        LINE_ID,
-        
+        USER_ID,
-
+        FIRST_NAME,
-    public:
+        LAST_NAME,
-        UserDb();
+        RFID_UID,
-        void test();
+        USER_PIN,
-        void PrintAll();
+        ENABLED
+    };
     struct User
     {
         // User(unsigned long new_uid): uid(new_uid){}
         unsigned long uid;
+        unsigned int line;
         mutable String first_name;
         mutable String last_name;
         mutable String rfid_uid;
@@ -29,6 +34,99 @@ namespace userdb
             return "ID: " + String(uid) + " Name: " + last_name + " " + first_name + " Enabled: " + (enabled ? "Yes" : "No");
         }
     };
-        User read_csv_line(String);
+
+    class UserDb
+    {
+    private:
+    public:
+        UserDb();
+        void print_to_serial();
+        void PrintAll();
+        // User find_user();
+        User user_by_pin(String);
+        User user_by_rfid(String);
+        User user_by_uid(unsigned long);
+        static User read_csv_line(String instring, int line = -1)
+        {
+            int locations[5];
+            int location_index = 0;
+            int str_length = instring.length() - 1;
+            for (int i = 0; i < str_length; i++)
+            {
+                if (instring.charAt(i) == ',')
+                {
+                    locations[location_index] = i;
+                    location_index++;
+                }
+            }
+            User res;
+            res.uid = instring.substring(0, locations[0]).toInt();
+            res.first_name = instring.substring(locations[0] + 1, locations[1]);
+            res.last_name = instring.substring(locations[1] + 1, locations[2]);
+            res.rfid_uid = instring.substring(locations[2] + 1, locations[3]);
+            res.user_pin = instring.substring(locations[3] + 1, locations[4]);
+            res.enabled = instring.charAt(locations[4] + 1) == '1' ? true : false;
+            res.line = line;
+            return res;
+        }
+
+        struct Iterator
+        {
+            using iterator_category = std::input_iterator_tag;
+            using pointer = void;
+            using value_type = User;
+            using reference = User;
+            using difference_type = std::ptrdiff_t;
+
+            Iterator(File data) : db_file(data)
+            {
+                if (!data)
+                {
+                    Serial.println("Failed to open userdb while creating an iterator");
+                }
+                else
+                {
+                    next();
+                }
+            }
+            reference operator*() const { return current; }
+            Iterator &operator++()
+            {
+                next();
+                return *this;
+            }
+            Iterator operator++(int)
+            {
+                next();
+                return *this;
+            }
+            ~Iterator()
+            {
+                db_file.close();
+            }
+            bool has_next()
+            {
+                return db_file.available();
+            }
+            void next()
+            {
+                if (has_next())
+                {
+                    String temp = db_file.readStringUntil('\n');
+                    current = read_csv_line(temp, line);
+                    line++;
+                }
+                else
+                {
+                    db_file.close();
+                }
+            };
+
+        private:
+            File db_file;
+            User current;
+            unsigned int line = 0;
+        };
+        Iterator begin() { return Iterator(LittleFS.open("userdb.csv", "r")); }
     };
 }

src/main.cpp

@@ -37,7 +37,7 @@ void setup()
 	Serial.print("Starting");
 	Serial.println(WiFi.softAPConfig(local_IP, gateway, subnet) ? "Ready" : "Failed!");
 	Serial.println(WiFi.softAP(config.SSID) ? "Ready" : "Failed!");
-	userdatabase.test();
+	userdatabase.print_to_serial();
 	//delay(500);
 	keyboard.begin(&Wire);
 	rfid.begin();
@@ -45,10 +45,10 @@ void setup()
 	//while(users.countUsers()<100){
 	//	users.addUser("Harry","Potter","","1234");
 	//}
-	
+	Serial.println(userdatabase.user_by_pin("12348").toString());
 	//users.PrintAllToSerial();
 	//Serial.println(persistence.TestRead());
-	users.ExportToPersistence();
+	//users.ExportToPersistence();
 	//Serial.println(persistence.TestRead());
 	
 }