/
bolt.go
227 lines (211 loc) · 5.93 KB
/
bolt.go
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package db
import (
"encoding/json"
"errors"
"fmt"
"strconv"
bolt "go.etcd.io/bbolt"
)
const (
bucketDictionary = "Dictionary"
bucketUsers = "Users"
bucketUsersDictionaries = "UsersDictionaries"
bucketQuizzes = "Quizzes"
)
// BoltStorage is a storage implementation using BoltDB
type BoltStorage struct {
db *bolt.DB
}
// Get dictionary item from database
func (b *BoltStorage) Get(word string) (DictionaryItem, error) {
var res *DictionaryItem
if err := b.db.View(func(tx *bolt.Tx) error {
var err error
res, err = b.getItem(word, tx)
return err
}); err != nil {
return DictionaryItem{}, err
}
if res == nil {
return DictionaryItem{}, ErrNotFound
}
return *res, nil
}
func (b *BoltStorage) getItem(word string, tx *bolt.Tx) (*DictionaryItem, error) {
bucket := tx.Bucket([]byte(bucketDictionary))
jdata := bucket.Get([]byte(word))
if len(jdata) == 0 {
return nil, nil
}
var res *DictionaryItem
if err := json.Unmarshal(jdata, &res); err != nil {
return nil, fmt.Errorf("unmarshal dictionary item: %w", err)
}
return res, nil
}
// Save dictionary item to database
func (b *BoltStorage) Save(item DictionaryItem) error {
return b.db.Update(func(tx *bolt.Tx) error {
bucket := tx.Bucket([]byte(bucketDictionary))
jdata, err := json.Marshal(item)
if err != nil {
return fmt.Errorf("marshal word: %w", err)
}
if err := bucket.Put([]byte(item.Word), jdata); err != nil {
return fmt.Errorf("put word: %w", err)
}
return nil
})
}
// GetUser returns user by id
func (b *BoltStorage) GetUser(user UserID) (User, error) {
var res User
if err := b.db.View(func(tx *bolt.Tx) error {
bucket := tx.Bucket([]byte(bucketUsers))
jdata := bucket.Get([]byte(strconv.FormatInt(int64(user), 10)))
if len(jdata) == 0 {
return ErrNotFound
}
if err := json.Unmarshal(jdata, &res); err != nil {
return fmt.Errorf("unmarshal user: %w", err)
}
return nil
}); err != nil {
return User{}, err
}
return res, nil
}
// SaveUser saves user to database
func (b *BoltStorage) SaveUser(user User) error {
return b.db.Update(func(tx *bolt.Tx) error {
bucket := tx.Bucket([]byte(bucketUsers))
jdata, err := json.Marshal(user)
if err != nil {
return fmt.Errorf("marshal user: %w", err)
}
if err := bucket.Put([]byte(strconv.FormatInt(int64(user.ID), 10)), jdata); err != nil {
return fmt.Errorf("put user: %w", err)
}
return nil
})
}
// GetUserItem returns user dictionary item
func (b *BoltStorage) GetUserItem(user UserID, word string) (UserDictionaryItem, error) {
var res UserDictionaryItem
if err := b.db.View(func(tx *bolt.Tx) error {
bucket := tx.Bucket([]byte(bucketUsersDictionaries))
userBucket := bucket.Bucket([]byte(strconv.FormatInt(int64(user), 10)))
if userBucket == nil {
return ErrNotFound
}
jdata := userBucket.Get([]byte(word))
if len(jdata) == 0 {
return ErrNotFound
}
if err := json.Unmarshal(jdata, &res); err != nil {
return fmt.Errorf("unmarshal user dictionary item: %w", err)
}
return nil
}); err != nil {
return UserDictionaryItem{}, err
}
return res, nil
}
// SaveUserItem saves user dictionary item to database
func (b *BoltStorage) SaveUserItem(item UserDictionaryItem) error {
return b.db.Update(func(tx *bolt.Tx) error {
bucket := tx.Bucket([]byte(bucketUsersDictionaries))
userBucket, err := bucket.CreateBucketIfNotExists([]byte(strconv.FormatInt(int64(item.User), 10)))
if err != nil {
return fmt.Errorf("create user bucket: %w", err)
}
jdata, err := json.Marshal(item)
if err != nil {
return fmt.Errorf("marshal user dictionary item: %w", err)
}
if err := userBucket.Put([]byte(item.Word), jdata); err != nil {
return fmt.Errorf("put item: %w", err)
}
return nil
})
}
// GetUserDictionary returns dictionary items for user
func (b *BoltStorage) GetUserDictionary(user UserID) (map[UserDictionaryItem]DictionaryItem, error) {
res := make(map[UserDictionaryItem]DictionaryItem)
err := b.db.View(func(tx *bolt.Tx) error {
bucket := tx.Bucket([]byte(bucketUsersDictionaries))
userBucket := bucket.Bucket([]byte(strconv.FormatInt(int64(user), 10)))
if userBucket == nil {
return nil
}
c := userBucket.Cursor()
for k, v := c.First(); k != nil; k, v = c.Next() {
var item UserDictionaryItem
if err := json.Unmarshal(v, &item); err != nil {
return fmt.Errorf("unmarshal user dictionary item: %w", err)
}
if item.Word == "" {
return errors.New("word is empty")
}
dicItem, err := b.getItem(item.Word, tx)
if err != nil {
return fmt.Errorf("get dictionary item: %w", err)
}
res[item] = *dicItem
}
return nil
})
if err != nil {
return nil, err
}
return res, nil
}
// SaveQuiz saves quiz to database
func (b *BoltStorage) SaveQuiz(quiz Quiz) error {
return b.db.Update(func(tx *bolt.Tx) error {
bucket := tx.Bucket([]byte(bucketQuizzes))
jdata, jerr := json.Marshal(quiz)
if jerr != nil {
return fmt.Errorf("marshal quiz: %w", jerr)
}
if err := bucket.Put([]byte(quiz.ID), jdata); err != nil {
return fmt.Errorf("put quiz: %w", err)
}
return nil
})
}
// GetQuiz returns quiz by ID`
func (b *BoltStorage) GetQuiz(id string) (Quiz, error) {
var res Quiz
err := b.db.View(func(tx *bolt.Tx) error {
bucket := tx.Bucket([]byte(bucketQuizzes))
jdata := bucket.Get([]byte(id))
if len(jdata) == 0 {
return ErrNotFound
}
if err := json.Unmarshal(jdata, &res); err != nil {
return fmt.Errorf("unmarshal quiz: %w", err)
}
return nil
})
if err != nil {
return res, err
}
return res, nil
}
// NewBoltStorage creates BoltStorage instance and initialize buckets
func NewBoltStorage(db *bolt.DB) (*BoltStorage, error) {
err := db.Update(func(tx *bolt.Tx) error {
for _, bucket := range []string{bucketUsers, bucketUsersDictionaries, bucketDictionary, bucketQuizzes} {
_, err := tx.CreateBucketIfNotExists([]byte(bucket))
if err != nil {
return err
}
}
return nil
})
if err != nil {
return nil, err
}
return &BoltStorage{db: db}, nil
}