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100 lines
2.0 KiB
Go
100 lines
2.0 KiB
Go
// +build leveldb
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package leveldb
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// #cgo LDFLAGS: -lleveldb
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// #include "leveldb/c.h"
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// #include "leveldb_ext.h"
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import "C"
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import (
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"unsafe"
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"github.com/syndtr/goleveldb/leveldb"
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)
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type WriteBatch struct {
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db *DB
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wbatch *C.leveldb_writebatch_t
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}
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func newWriteBatch(db *DB) *WriteBatch {
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w := new(WriteBatch)
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w.db = db
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w.wbatch = C.leveldb_writebatch_create()
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return w
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}
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func (w *WriteBatch) Close() {
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if w.wbatch != nil {
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C.leveldb_writebatch_destroy(w.wbatch)
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w.wbatch = nil
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}
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}
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func (w *WriteBatch) Put(key, value []byte) {
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var k, v *C.char
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if len(key) != 0 {
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k = (*C.char)(unsafe.Pointer(&key[0]))
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}
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if len(value) != 0 {
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v = (*C.char)(unsafe.Pointer(&value[0]))
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}
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lenk := len(key)
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lenv := len(value)
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C.leveldb_writebatch_put(w.wbatch, k, C.size_t(lenk), v, C.size_t(lenv))
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}
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func (w *WriteBatch) Delete(key []byte) {
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C.leveldb_writebatch_delete(w.wbatch,
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(*C.char)(unsafe.Pointer(&key[0])), C.size_t(len(key)))
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}
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func (w *WriteBatch) Commit() error {
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return w.commit(w.db.writeOpts)
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}
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func (w *WriteBatch) SyncCommit() error {
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return w.commit(w.db.syncOpts)
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}
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func (w *WriteBatch) Rollback() error {
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C.leveldb_writebatch_clear(w.wbatch)
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return nil
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}
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func (w *WriteBatch) commit(wb *WriteOptions) error {
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var errStr *C.char
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C.leveldb_write(w.db.db, wb.Opt, w.wbatch, &errStr)
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if errStr != nil {
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return saveError(errStr)
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}
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return nil
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}
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//export leveldb_writebatch_iterate_put
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func leveldb_writebatch_iterate_put(p unsafe.Pointer, k *C.char, klen C.size_t, v *C.char, vlen C.size_t) {
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b := (*leveldb.Batch)(p)
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key := slice(unsafe.Pointer(k), int(klen))
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value := slice(unsafe.Pointer(v), int(vlen))
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b.Put(key, value)
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}
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//export leveldb_writebatch_iterate_delete
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func leveldb_writebatch_iterate_delete(p unsafe.Pointer, k *C.char, klen C.size_t) {
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b := (*leveldb.Batch)(p)
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key := slice(unsafe.Pointer(k), int(klen))
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b.Delete(key)
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}
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func (w *WriteBatch) Data() []byte {
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gbatch := leveldb.Batch{}
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C.leveldb_writebatch_iterate_ext(w.wbatch,
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unsafe.Pointer(&gbatch))
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return gbatch.Dump()
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}
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