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badgerstore.go
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badgerstore.go
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package badgerstore
import (
"time"
"github.com/dgraph-io/badger"
)
// BadgerStore represents the session store.
type BadgerStore struct {
db *badger.DB
prefix string
}
// New returns a new BadgerStore instance.
// The db parameter should be a pointer to a badger store instance.
func New(db *badger.DB) *BadgerStore {
return NewWithPrefix(db, "scs:session:")
}
// NewWithPrefix returns a new BadgerStore instance.
// The db parameter should be a pointer to a badger store instance.
// The prefix parameter controls the Badger key prefix,
// which can be used to avoid naming clashes if necessary.
func NewWithPrefix(db *badger.DB, prefix string) *BadgerStore {
return &BadgerStore{
db: db,
prefix: prefix,
}
}
// Find returns the data for a given session token from the BadgerStore
// instance. If the session token is not found or is expired,
// the returned exists flag will be set to false.
func (bs *BadgerStore) Find(token string) ([]byte, bool, error) {
key := []byte(bs.prefix + token)
txn := bs.db.NewTransaction(false)
defer txn.Discard()
item, err := txn.Get(key)
if err == badger.ErrKeyNotFound {
return nil, false, nil
} else if err != nil {
return nil, false, err
}
data, err := item.ValueCopy(nil)
if err != nil {
return nil, false, err
}
return data, true, nil
}
// Commit adds a session token and data to the BadgerStore instance with the
// given expiry time. If the session token already exists then the data and
// expiry time are updated.
func (bs *BadgerStore) Commit(token string, data []byte, expiry time.Time) error {
txn := bs.db.NewTransaction(true)
defer txn.Discard()
key := []byte(bs.prefix + token)
entry := badger.NewEntry(key, data).WithTTL(time.Until(expiry))
err := txn.SetEntry(entry)
if err != nil {
return err
}
if err := txn.Commit(); err != nil {
return err
}
return nil
}
// Delete removes a session token and corresponding data from the BadgerStore instance.
func (bs *BadgerStore) Delete(token string) error {
txn := bs.db.NewTransaction(true)
defer txn.Discard()
txn.Delete([]byte(bs.prefix + token))
if err := txn.Commit(); err != nil {
return err
}
return nil
}
// All returns a map containing the token and data for all active (i.e.
// not expired) sessions in the BadgerStore instance.
func (bs *BadgerStore) All() (map[string][]byte, error) {
sessions := make(map[string][]byte)
err := bs.db.View(func(txn *badger.Txn) error {
iterator := txn.NewIterator(badger.DefaultIteratorOptions)
defer iterator.Close()
prefix := []byte(bs.prefix)
for iterator.Seek(prefix); iterator.ValidForPrefix(prefix); iterator.Next() {
item := iterator.Item()
key := item.Key()
err := item.Value(func(val []byte) error {
token := string(key)[len(prefix):]
sessions[token] = val
return nil
})
if err != nil {
return err
}
}
return nil
})
if err != nil {
return nil, err
}
return sessions, nil
}