358 lines
6.6 KiB
Go
358 lines
6.6 KiB
Go
// Copyright © 2016 Abcum Ltd
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package mysql
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import (
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"bytes"
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"math"
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"database/sql"
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"github.com/abcum/surreal/kvs"
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"github.com/abcum/surreal/util/cryp"
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"github.com/abcum/surreal/util/snap"
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)
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// TX is a distributed database transaction.
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type TX struct {
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ds *DS
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do bool
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ck []byte
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tx *sql.Tx
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}
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// All retrieves all key:value items in the db.
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func (tx *TX) All() (kvs []kvs.KV, err error) {
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res, err := tx.tx.Query("SELECT `key`, `val` FROM kv ORDER BY `key` ASC")
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if err != nil {
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return
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}
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defer res.Close()
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for res.Next() {
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var key, val []byte
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err := res.Scan(&key, &val)
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if err != nil {
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return nil, err
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}
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kv, err := get(tx, key, val)
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if err != nil {
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return nil, err
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}
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kvs = append(kvs, kv)
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}
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err = res.Err()
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if err != nil {
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return nil, err
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}
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return
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}
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// Get retrieves a single key:value item.
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func (tx *TX) Get(key []byte) (kv kvs.KV, err error) {
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row := tx.tx.QueryRow("SELECT `val` FROM kv WHERE `key` = ?", key)
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var val []byte
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row.Scan(&val)
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return get(tx, key, val)
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}
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// MGet retrieves multiple key:value items.
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func (tx *TX) MGet(keys ...[]byte) (kvs []kvs.KV, err error) {
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/*
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res, err := tx.tx.Query("SELECT `key`, `val` FROM kv WHERE `key` IN (?)", keys)
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if err != nil {
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return
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}
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defer res.Close()
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for res.Next() {
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var key, val []byte
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err := res.Scan(&key, &val)
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if err != nil {
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return nil, err
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}
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kv, err := get(tx, key, val)
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if err != nil {
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return nil, err
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}
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kvs = append(kvs, kv)
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}
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err = res.Err()
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if err != nil {
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return nil, err
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}
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*/
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for _, key := range keys {
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kv, _ := tx.Get(key)
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kvs = append(kvs, kv)
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}
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return
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}
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// PGet retrieves the range of rows which are prefixed with `pre`.
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func (tx *TX) PGet(pre []byte) (kvs []kvs.KV, err error) {
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end := append(pre, 0xff)
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return tx.RGet(pre, end, 0)
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}
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// RGet retrieves the range of `max` rows between `beg` (inclusive) and
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// `end` (exclusive). To return the range in descending order, ensure
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// that `end` sorts lower than `beg` in the key value store.
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func (tx *TX) RGet(beg, end []byte, max uint64) (kvs []kvs.KV, err error) {
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if max == 0 {
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max = math.MaxUint64
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}
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res, err := tx.tx.Query("SELECT `key`, `val` FROM kv WHERE `key` BETWEEN ? AND ? ORDER BY `key` ASC LIMIT ?", beg, end, max)
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if err != nil {
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return nil, err
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}
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defer res.Close()
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for res.Next() {
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var key, val []byte
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err := res.Scan(&key, &val)
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if err != nil {
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return nil, err
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}
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kv, err := get(tx, key, val)
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if err != nil {
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return nil, err
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}
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kvs = append(kvs, kv)
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}
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err = res.Err()
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if err != nil {
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return nil, err
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}
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return
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}
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// Put sets the value for a key.
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func (tx *TX) Put(key, val []byte) (err error) {
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if val, err = snap.Encode(val); err != nil {
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err = &kvs.DBError{Err: err}
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return
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}
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if val, err = cryp.Encrypt(tx.ds.ck, val); err != nil {
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err = &kvs.CKError{Err: err}
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return
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}
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if _, err = tx.tx.Exec("INSERT INTO kv (`key`, `val`) VALUES (?, ?) ON DUPLICATE KEY UPDATE `val` = ?", key, val, val); err != nil {
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err = &kvs.DBError{Err: err}
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return
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}
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return
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}
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// CPut conditionally sets the value for a key if the existing value is equal
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// to the expected value. To conditionally set a value only if there is no
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// existing entry pass nil for the expected value.
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func (tx *TX) CPut(key, val, exp []byte) (err error) {
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now, _ := tx.Get(key)
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act := now.(*KV).val
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if !bytes.Equal(act, exp) {
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err = &kvs.KVError{Err: err, Key: key, Val: act, Exp: exp}
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return
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}
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if val, err = snap.Encode(val); err != nil {
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err = &kvs.DBError{Err: err}
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return
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}
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if val, err = cryp.Encrypt(tx.ds.ck, val); err != nil {
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err = &kvs.CKError{Err: err}
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return
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}
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if _, err = tx.tx.Exec("INSERT INTO kv (`key`, `val`) VALUES (?, ?) ON DUPLICATE KEY UPDATE `val` = ?", key, val, val); err != nil {
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err = &kvs.DBError{Err: err}
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return
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}
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return
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}
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// Del deletes a single key:value item.
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func (tx *TX) Del(key []byte) (err error) {
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if _, err = tx.tx.Exec("DELETE FROM kv WHERE `key` = ?", key); err != nil {
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err = &kvs.DBError{Err: err}
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return
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}
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return
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}
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// CDel conditionally deletes a key if the existing value is equal to the
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// expected value.
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func (tx *TX) CDel(key, exp []byte) (err error) {
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now, _ := tx.Get(key)
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act := now.(*KV).val
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if !bytes.Equal(act, exp) {
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err = &kvs.KVError{Err: err, Key: key, Val: act, Exp: exp}
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return
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}
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if _, err = tx.tx.Exec("DELETE FROM kv WHERE `key` = ?", key); err != nil {
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err = &kvs.DBError{Err: err}
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return
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}
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return
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}
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// MDel deletes multiple key:value items.
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func (tx *TX) MDel(keys ...[]byte) (err error) {
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/*
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if _, err = tx.tx.Exec("DELETE FROM kv WHERE `key` IN (?)", keys); err != nil {
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err = &kvs.DBError{Err:err}
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return
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}
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*/
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for _, key := range keys {
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err = tx.Del(key)
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}
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return
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}
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// PDel deletes the range of rows which are prefixed with `pre`.
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func (tx *TX) PDel(pre []byte) (err error) {
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end := append(pre, 0xff)
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return tx.RDel(pre, end, 0)
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}
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// RDel deletes the range of `max` rows between `beg` (inclusive) and
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// `end` (exclusive). To delete the range in descending order, ensure
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// that `end` sorts lower than `beg` in the key value store.
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func (tx *TX) RDel(beg, end []byte, max uint64) (err error) {
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if max == 0 {
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max = math.MaxUint64
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}
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if _, err = tx.tx.Exec("DELETE FROM kv WHERE `key` BETWEEN ? AND ? ORDER BY `key` ASC LIMIT ?", beg, end, max); err != nil {
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err = &kvs.DBError{Err: err}
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return
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}
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return
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}
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func (tx *TX) Done() (val bool) {
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return tx.do
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}
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func (tx *TX) Close() (err error) {
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return tx.Rollback()
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}
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func (tx *TX) Cancel() (err error) {
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return tx.Rollback()
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}
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func (tx *TX) Commit() (err error) {
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tx.do = true
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return tx.tx.Commit()
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}
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func (tx *TX) Rollback() (err error) {
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tx.do = true
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return tx.tx.Rollback()
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}
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func get(tx *TX, key, val []byte) (kv *KV, err error) {
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kv = &KV{
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exi: (val != nil),
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key: key,
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val: val,
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}
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kv.val, err = cryp.Decrypt(tx.ds.ck, kv.val)
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if err != nil {
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err = &kvs.CKError{Err: err}
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return
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}
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kv.val, err = snap.Decode(kv.val)
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if err != nil {
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err = &kvs.DBError{Err: err}
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return
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}
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return
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}
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