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135 lines
2.7 KiB
135 lines
2.7 KiB
package db
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import (
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"errors"
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"sync"
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"github.com/harmony-one/harmony/utils"
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)
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// MemDatabase is the test memory database. It won't be used for any production.
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type MemDatabase struct {
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db map[string][]byte
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lock sync.RWMutex
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}
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// NewMemDatabase returns a pointer of the new creation of MemDatabase.
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func NewMemDatabase() *MemDatabase {
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return &MemDatabase{
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db: make(map[string][]byte),
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}
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}
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// NewMemDatabaseWithCap returns a pointer of the new creation of MemDatabase with the given size.
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func NewMemDatabaseWithCap(size int) *MemDatabase {
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return &MemDatabase{
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db: make(map[string][]byte, size),
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}
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}
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// Put puts (key, value) item into MemDatabase.
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func (db *MemDatabase) Put(key []byte, value []byte) error {
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db.lock.Lock()
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defer db.lock.Unlock()
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db.db[string(key)] = utils.CopyBytes(value)
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return nil
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}
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// Has checks if the key is included into MemDatabase.
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func (db *MemDatabase) Has(key []byte) (bool, error) {
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db.lock.RLock()
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defer db.lock.RUnlock()
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_, ok := db.db[string(key)]
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return ok, nil
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}
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// Get gets value of the given key.
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func (db *MemDatabase) Get(key []byte) ([]byte, error) {
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db.lock.RLock()
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defer db.lock.RUnlock()
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if entry, ok := db.db[string(key)]; ok {
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return utils.CopyBytes(entry), nil
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}
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return nil, errors.New("not found")
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}
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// Keys returns all keys of the given MemDatabase.
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func (db *MemDatabase) Keys() [][]byte {
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db.lock.RLock()
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defer db.lock.RUnlock()
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keys := [][]byte{}
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for key := range db.db {
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keys = append(keys, []byte(key))
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}
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return keys
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}
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// Delete deletes the given key.
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func (db *MemDatabase) Delete(key []byte) error {
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db.lock.Lock()
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defer db.lock.Unlock()
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delete(db.db, string(key))
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return nil
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}
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// Close closes the given db.
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func (db *MemDatabase) Close() {}
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// NewBatch returns a batch of MemDatabase transactions.
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func (db *MemDatabase) NewBatch() Batch {
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return &memBatch{db: db}
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}
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// Len returns the length of the given db.
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func (db *MemDatabase) Len() int { return len(db.db) }
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type kv struct {
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k, v []byte
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del bool
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}
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type memBatch struct {
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db *MemDatabase
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writes []kv
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size int
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}
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func (b *memBatch) Put(key, value []byte) error {
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b.writes = append(b.writes, kv{utils.CopyBytes(key), utils.CopyBytes(value), false})
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b.size += len(value)
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return nil
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}
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func (b *memBatch) Delete(key []byte) error {
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b.writes = append(b.writes, kv{utils.CopyBytes(key), nil, true})
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b.size++
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return nil
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}
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func (b *memBatch) Write() error {
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b.db.lock.Lock()
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defer b.db.lock.Unlock()
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for _, kv := range b.writes {
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if kv.del {
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delete(b.db.db, string(kv.k))
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continue
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}
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b.db.db[string(kv.k)] = kv.v
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}
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return nil
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}
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func (b *memBatch) ValueSize() int {
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return b.size
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}
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func (b *memBatch) Reset() {
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b.writes = b.writes[:0]
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b.size = 0
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}
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