create fake database until real DB is implemented

db/fake_db.go

@@ -0,0 +1,47 @@
+package db
+
+import (
+	"encoding/json"
+	"fmt"
+	"io"
+	"os"
+)
+
+func ExecDB(db_name string) map[string]interface{} {
+	var result map[string]interface{}
+
+	if db_name == "users" {
+		users_db, err := os.Open("./test_data/users.json")
+		if err != nil {
+			fmt.Println(err)
+			return nil
+		}
+		fmt.Println("Successfully opened Users DB")
+		defer users_db.Close()
+
+		byteValue, _ := io.ReadAll(users_db)
+		var users []interface{}
+		json.Unmarshal(byteValue, &users)
+		result = map[string]interface{}{"users": users}
+
+	} else if db_name == "messages" {
+		messages_db, err := os.Open("./test_data/messages.json")
+		if err != nil {
+			fmt.Println(err)
+			return nil
+		}
+		fmt.Println("Successfully opened Messages DB")
+		defer messages_db.Close()
+
+		byteValue, _ := io.ReadAll(messages_db)
+		var messages []interface{}
+		json.Unmarshal(byteValue, &messages)
+		result = map[string]interface{}{"messages": messages}
+
+	} else {
+		fmt.Println("Invalid DB name")
+		return nil
+	}
+
+	return result
+}