/
mapdb.go
264 lines (200 loc) · 5.62 KB
/
mapdb.go
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// Package mapdb provides a map implementation of a key value store.
// It offers a lightweight drop-in replacement of hive.go/kvstore for tests or in simulations
// where more than one instance is required.
package mapdb
import (
"sync"
"go.uber.org/atomic"
"github.com/iotaledger/hive.go/core/byteutils"
"github.com/iotaledger/hive.go/core/kvstore"
"github.com/iotaledger/hive.go/core/types"
)
// mapDB is a simple implementation of KVStore using a map.
type mapDB struct {
sync.RWMutex
m *syncedKVMap
closed *atomic.Bool
realm []byte
}
// NewMapDB creates a kvstore.KVStore implementation purely based on a go map.
func NewMapDB() kvstore.KVStore {
return &mapDB{
m: &syncedKVMap{m: make(map[string][]byte)},
closed: atomic.NewBool(false),
}
}
func (s *mapDB) WithRealm(realm kvstore.Realm) (kvstore.KVStore, error) {
if s.closed.Load() {
return nil, kvstore.ErrStoreClosed
}
return &mapDB{
m: s.m, // use the same underlying map
closed: s.closed,
realm: realm,
}, nil
}
func (s *mapDB) WithExtendedRealm(realm kvstore.Realm) (kvstore.KVStore, error) {
return s.WithRealm(byteutils.ConcatBytes(s.Realm(), realm))
}
func (s *mapDB) Realm() kvstore.Realm {
return byteutils.ConcatBytes(s.realm)
}
// Iterate iterates over all keys and values with the provided prefix. You can pass kvstore.EmptyPrefix to iterate over all keys and values.
// Optionally the direction for the iteration can be passed (default: IterDirectionForward).
func (s *mapDB) Iterate(prefix kvstore.KeyPrefix, consumerFunc kvstore.IteratorKeyValueConsumerFunc, iterDirection ...kvstore.IterDirection) error {
if s.closed.Load() {
return kvstore.ErrStoreClosed
}
s.m.iterate(s.realm, prefix, consumerFunc, iterDirection...)
return nil
}
// IterateKeys iterates over all keys with the provided prefix. You can pass kvstore.EmptyPrefix to iterate over all keys.
// Optionally the direction for the iteration can be passed (default: IterDirectionForward).
func (s *mapDB) IterateKeys(prefix kvstore.KeyPrefix, consumerFunc kvstore.IteratorKeyConsumerFunc, iterDirection ...kvstore.IterDirection) error {
if s.closed.Load() {
return kvstore.ErrStoreClosed
}
s.m.iterateKeys(s.realm, prefix, consumerFunc, iterDirection...)
return nil
}
func (s *mapDB) Clear() error {
if s.closed.Load() {
return kvstore.ErrStoreClosed
}
s.Lock()
defer s.Unlock()
s.m.deletePrefix(s.realm)
return nil
}
func (s *mapDB) Get(key kvstore.Key) (kvstore.Value, error) {
if s.closed.Load() {
return nil, kvstore.ErrStoreClosed
}
s.RLock()
defer s.RUnlock()
value, contains := s.m.get(byteutils.ConcatBytes(s.realm, key))
if !contains {
return nil, kvstore.ErrKeyNotFound
}
return value, nil
}
func (s *mapDB) Set(key kvstore.Key, value kvstore.Value) error {
if s.closed.Load() {
return kvstore.ErrStoreClosed
}
s.Lock()
defer s.Unlock()
return s.set(key, value)
}
func (s *mapDB) set(key kvstore.Key, value kvstore.Value) error {
s.m.set(byteutils.ConcatBytes(s.realm, key), value)
return nil
}
func (s *mapDB) Has(key kvstore.Key) (bool, error) {
if s.closed.Load() {
return false, kvstore.ErrStoreClosed
}
s.RLock()
defer s.RUnlock()
contains := s.m.has(byteutils.ConcatBytes(s.realm, key))
return contains, nil
}
func (s *mapDB) Delete(key kvstore.Key) error {
if s.closed.Load() {
return kvstore.ErrStoreClosed
}
s.Lock()
defer s.Unlock()
return s.delete(key)
}
func (s *mapDB) delete(key kvstore.Key) error {
s.m.delete(byteutils.ConcatBytes(s.realm, key))
return nil
}
func (s *mapDB) DeletePrefix(prefix kvstore.KeyPrefix) error {
if s.closed.Load() {
return kvstore.ErrStoreClosed
}
s.Lock()
defer s.Unlock()
s.m.deletePrefix(byteutils.ConcatBytes(s.realm, prefix))
return nil
}
func (s *mapDB) Flush() error {
if s.closed.Load() {
return kvstore.ErrStoreClosed
}
return nil
}
func (s *mapDB) Close() error {
if s.closed.Swap(true) {
// was already closed
return nil
}
return nil
}
func (s *mapDB) Batched() (kvstore.BatchedMutations, error) {
if s.closed.Load() {
return nil, kvstore.ErrStoreClosed
}
return &batchedMutations{
kvStore: s,
setOperations: make(map[string]kvstore.Value),
deleteOperations: make(map[string]types.Empty),
closed: s.closed,
}, nil
}
// batchedMutations is a wrapper to do a batched update on a mapDB.
type batchedMutations struct {
sync.Mutex
kvStore *mapDB
setOperations map[string]kvstore.Value
deleteOperations map[string]types.Empty
closed *atomic.Bool
}
func (b *batchedMutations) Set(key kvstore.Key, value kvstore.Value) error {
stringKey := byteutils.ConcatBytesToString(key)
b.Lock()
defer b.Unlock()
delete(b.deleteOperations, stringKey)
b.setOperations[stringKey] = value
return nil
}
func (b *batchedMutations) Delete(key kvstore.Key) error {
stringKey := byteutils.ConcatBytesToString(key)
b.Lock()
defer b.Unlock()
delete(b.setOperations, stringKey)
b.deleteOperations[stringKey] = types.Void
return nil
}
func (b *batchedMutations) Cancel() {
b.Lock()
defer b.Unlock()
b.setOperations = make(map[string]kvstore.Value)
b.deleteOperations = make(map[string]types.Empty)
}
func (b *batchedMutations) Commit() error {
if b.closed.Load() {
return kvstore.ErrStoreClosed
}
b.Lock()
b.kvStore.Lock()
defer b.kvStore.Unlock()
defer b.Unlock()
for key, value := range b.setOperations {
err := b.kvStore.set([]byte(key), value)
if err != nil {
return err
}
}
for key := range b.deleteOperations {
err := b.kvStore.delete([]byte(key))
if err != nil {
return err
}
}
return nil
}
var _ kvstore.KVStore = &mapDB{}
var _ kvstore.BatchedMutations = &batchedMutations{}