refactor db accessor

core/nkode/in_memory_db.go

@@ -0,0 +1,100 @@
+package nkode
+
+import (
+	"errors"
+	"fmt"
+	m "go-nkode/core/model"
+)
+
+type InMemoryDb struct {
+	Customers map[m.CustomerId]Customer
+	Users     map[m.UserId]User
+	userIdMap map[string]m.UserId
+}
+
+func NewInMemoryDb() InMemoryDb {
+	return InMemoryDb{
+		Customers: make(map[m.CustomerId]Customer),
+		Users:     make(map[m.UserId]User),
+		userIdMap: make(map[string]m.UserId),
+	}
+}
+
+func (db *InMemoryDb) GetCustomer(id m.CustomerId) (*Customer, error) {
+	customer, exists := db.Customers[id]
+	if !exists {
+		return nil, errors.New(fmt.Sprintf("customer %s dne", customer.Id))
+	}
+	return &customer, nil
+}
+
+func (db *InMemoryDb) GetUser(username m.Username, customerId m.CustomerId) (*User, error) {
+	key := userIdKey(customerId, username)
+	userId, exists := db.userIdMap[key]
+	if !exists {
+		return nil, errors.New(fmt.Sprintf("customer %s with username %s dne", customerId, username))
+	}
+	user, exists := db.Users[userId]
+	if !exists {
+		panic(fmt.Sprintf("userId %s with customerId %s and username %s with no user", userId, customerId, username))
+	}
+	return &user, nil
+}
+
+func (db *InMemoryDb) WriteNewCustomer(customer Customer) error {
+	_, exists := db.Customers[customer.Id]
+
+	if exists {
+		return errors.New(fmt.Sprintf("can write customer %s; already exists", customer.Id))
+	}
+	db.Customers[customer.Id] = customer
+	return nil
+}
+
+func (db *InMemoryDb) WriteNewUser(user User) error {
+	_, exists := db.Customers[user.CustomerId]
+	if !exists {
+		return errors.New(fmt.Sprintf("can't add user %s to customer %s: customer dne", user.Username, user.CustomerId))
+	}
+	userExists, _ := db.GetUser(user.Username, user.CustomerId)
+
+	if userExists != nil {
+		return errors.New(fmt.Sprintf("can't write new user %s, alread exists", user.Username))
+	}
+	key := userIdKey(user.CustomerId, user.Username)
+	db.userIdMap[key] = user.Id
+	db.Users[user.Id] = user
+	return nil
+}
+
+func (db *InMemoryDb) UpdateUserInterface(userId m.UserId, ui UserInterface) error {
+	user, exists := db.Users[userId]
+	if !exists {
+		return errors.New(fmt.Sprintf("can't update user %s, dne", user.Id))
+	}
+	user.Interface = ui
+	return nil
+}
+
+func (db *InMemoryDb) Renew(id m.CustomerId) error {
+	customer, exists := db.Customers[id]
+	if !exists {
+		return errors.New(fmt.Sprintf("customer %s does not exist", id))
+	}
+	setXor, attrsXor := customer.RenewKeys()
+	var err error
+	for _, user := range db.Users {
+		if user.CustomerId == id {
+			err = user.RenewKeys(setXor[:user.Kp.AttrsPerKey], attrsXor[:user.Kp.TotalAttrs()])
+			if err != nil {
+				panic(err)
+			}
+		}
+	}
+	return nil
+}
+
+func userIdKey(customerId m.CustomerId, username m.Username) string {
+	key := fmt.Sprintf("%s:%s", customerId, username)
+	return key
+}