457 lines
7.7 KiB
Go
457 lines
7.7 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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"math"
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"sync"
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"context"
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"database/sql"
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"github.com/abcum/surreal/cnf"
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"github.com/abcum/surreal/kvs"
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)
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type TX struct {
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done bool
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pntr *sql.Tx
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lock sync.Mutex
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stmt struct {
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clr *sql.Stmt
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clrP *sql.Stmt
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clrR *sql.Stmt
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get *sql.Stmt
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getP *sql.Stmt
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getR *sql.Stmt
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del *sql.Stmt
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delP *sql.Stmt
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delR *sql.Stmt
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put *sql.Stmt
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putN *sql.Stmt
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}
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}
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const maximum = math.MaxUint64
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func dec(src []byte) (dst []byte, err error) {
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if dst, err = decrypt(cnf.Settings.DB.Key, src); err != nil {
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return nil, &kvs.DBError{}
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}
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return
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}
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func enc(src []byte) (dst []byte, err error) {
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if dst, err = encrypt(cnf.Settings.DB.Key, src); err != nil {
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return nil, &kvs.DBError{}
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}
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return
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}
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func one(res *sql.Rows, err error) (kvs.KV, error) {
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switch err {
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case nil:
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break
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default:
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return nil, &kvs.DBError{}
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}
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defer res.Close()
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var out = &KV{}
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for res.Next() {
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err = res.Scan(&out.ver, &out.key, &out.val)
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if err != nil {
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return nil, &kvs.DBError{}
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}
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out.val, err = dec(out.val)
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if err != nil {
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return nil, &kvs.DBError{}
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}
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}
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if err = res.Err(); err != nil {
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return nil, &kvs.DBError{}
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}
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return out, err
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}
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func many(res *sql.Rows, err error) ([]kvs.KV, error) {
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switch err {
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case nil:
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break
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default:
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return nil, &kvs.DBError{}
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}
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defer res.Close()
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var out []kvs.KV
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for res.Next() {
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kv := &KV{}
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err = res.Scan(&kv.ver, &kv.key, &kv.val)
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if err != nil {
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return nil, &kvs.DBError{}
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}
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kv.val, err = dec(kv.val)
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if err != nil {
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return nil, &kvs.DBError{}
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}
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if kv.val != nil {
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out = append(out, kv)
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}
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}
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if err = res.Err(); err != nil {
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return nil, &kvs.DBError{}
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}
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return out, err
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}
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func (tx *TX) Closed() bool {
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return tx.done
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}
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func (tx *TX) Cancel() error {
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tx.done = true
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return tx.pntr.Rollback()
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}
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func (tx *TX) Commit() error {
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tx.done = true
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return tx.pntr.Commit()
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}
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func (tx *TX) Clr(ctx context.Context, key []byte) (kvs.KV, error) {
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var err error
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var res *sql.Rows
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tx.lock.Lock()
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defer tx.lock.Unlock()
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if tx.stmt.clr == nil {
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tx.stmt.clr, _ = tx.pntr.PrepareContext(ctx, sqlClr)
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}
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res, err = tx.stmt.clr.QueryContext(ctx, key)
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return one(res, err)
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}
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func (tx *TX) ClrP(ctx context.Context, key []byte, max uint64) ([]kvs.KV, error) {
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var err error
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var res *sql.Rows
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if max == 0 {
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max = maximum
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}
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tx.lock.Lock()
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defer tx.lock.Unlock()
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if tx.stmt.clrP == nil {
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tx.stmt.clrP, _ = tx.pntr.PrepareContext(ctx, sqlClrP)
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}
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res, err = tx.stmt.clrP.QueryContext(ctx, key, max)
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return many(res, err)
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}
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func (tx *TX) ClrR(ctx context.Context, beg []byte, end []byte, max uint64) ([]kvs.KV, error) {
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var err error
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var res *sql.Rows
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if max == 0 {
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max = maximum
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}
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tx.lock.Lock()
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defer tx.lock.Unlock()
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if tx.stmt.clrR == nil {
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tx.stmt.clrR, _ = tx.pntr.PrepareContext(ctx, sqlClrR)
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}
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res, err = tx.stmt.clrR.QueryContext(ctx, beg, end, max)
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return many(res, err)
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}
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func (tx *TX) Get(ctx context.Context, ver int64, key []byte) (kvs.KV, error) {
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var err error
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var res *sql.Rows
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tx.lock.Lock()
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defer tx.lock.Unlock()
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if tx.stmt.get == nil {
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tx.stmt.get, _ = tx.pntr.PrepareContext(ctx, sqlGet)
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}
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res, err = tx.stmt.get.QueryContext(ctx, ver, key)
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return one(res, err)
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}
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func (tx *TX) GetP(ctx context.Context, ver int64, key []byte, max uint64) ([]kvs.KV, error) {
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var err error
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var res *sql.Rows
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if max == 0 {
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max = maximum
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}
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tx.lock.Lock()
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defer tx.lock.Unlock()
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if tx.stmt.getP == nil {
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tx.stmt.getP, _ = tx.pntr.PrepareContext(ctx, sqlGetP)
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}
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res, err = tx.stmt.getP.QueryContext(ctx, ver, key, max)
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return many(res, err)
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}
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func (tx *TX) GetR(ctx context.Context, ver int64, beg []byte, end []byte, max uint64) ([]kvs.KV, error) {
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var err error
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var res *sql.Rows
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if max == 0 {
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max = maximum
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}
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tx.lock.Lock()
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defer tx.lock.Unlock()
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if tx.stmt.getR == nil {
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tx.stmt.getR, _ = tx.pntr.PrepareContext(ctx, sqlGetR)
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}
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res, err = tx.stmt.getR.QueryContext(ctx, ver, beg, end, max)
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return many(res, err)
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}
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func (tx *TX) Del(ctx context.Context, ver int64, key []byte) (kvs.KV, error) {
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var err error
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var res *sql.Rows
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tx.lock.Lock()
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defer tx.lock.Unlock()
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if tx.stmt.del == nil {
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tx.stmt.del, _ = tx.pntr.PrepareContext(ctx, sqlDel)
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}
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res, err = tx.stmt.del.QueryContext(ctx, ver, key)
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return one(res, err)
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}
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func (tx *TX) DelC(ctx context.Context, ver int64, key []byte, exp []byte) (kvs.KV, error) {
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var err error
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var now kvs.KV
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var res *sql.Rows
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tx.lock.Lock()
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defer tx.lock.Unlock()
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// Get the item at the key
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if tx.stmt.get == nil {
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tx.stmt.get, _ = tx.pntr.PrepareContext(ctx, sqlGet)
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}
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res, err = tx.stmt.get.QueryContext(ctx, ver, key)
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if err != nil {
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return nil, err
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}
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now, err = one(res, err)
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if err != nil {
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return nil, err
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}
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// Check if the values match
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if !alter(now.Val(), exp) {
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return nil, ErrTxNotExpectedValue
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}
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// If they match then delete
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if tx.stmt.del == nil {
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tx.stmt.del, _ = tx.pntr.PrepareContext(ctx, sqlDel)
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}
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res, err = tx.stmt.del.QueryContext(ctx, ver, key)
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return one(res, err)
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}
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func (tx *TX) DelP(ctx context.Context, ver int64, key []byte, max uint64) ([]kvs.KV, error) {
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var err error
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var res *sql.Rows
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if max == 0 {
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max = maximum
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}
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tx.lock.Lock()
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defer tx.lock.Unlock()
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if tx.stmt.delP == nil {
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tx.stmt.delP, _ = tx.pntr.PrepareContext(ctx, sqlDelP)
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}
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res, err = tx.stmt.delP.QueryContext(ctx, ver, key, max)
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return many(res, err)
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}
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func (tx *TX) DelR(ctx context.Context, ver int64, beg []byte, end []byte, max uint64) ([]kvs.KV, error) {
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var err error
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var res *sql.Rows
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if max == 0 {
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max = maximum
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}
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tx.lock.Lock()
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defer tx.lock.Unlock()
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if tx.stmt.delR == nil {
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tx.stmt.delR, _ = tx.pntr.PrepareContext(ctx, sqlDelR)
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}
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res, err = tx.stmt.delR.QueryContext(ctx, ver, beg, end, max)
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return many(res, err)
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}
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func (tx *TX) Put(ctx context.Context, ver int64, key []byte, val []byte) (kvs.KV, error) {
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var err error
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var res *sql.Rows
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val, err = enc(val)
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if err != nil {
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return nil, err
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}
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tx.lock.Lock()
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defer tx.lock.Unlock()
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if tx.stmt.put == nil {
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tx.stmt.put, _ = tx.pntr.PrepareContext(ctx, sqlPut)
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}
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res, err = tx.stmt.put.QueryContext(ctx, ver, key, val, val)
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return one(res, err)
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}
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func (tx *TX) PutC(ctx context.Context, ver int64, key []byte, val []byte, exp []byte) (kvs.KV, error) {
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var err error
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var now kvs.KV
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var res *sql.Rows
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val, err = enc(val)
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if err != nil {
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return nil, err
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}
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switch exp {
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case nil:
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if tx.stmt.putN == nil {
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tx.stmt.putN, _ = tx.pntr.PrepareContext(ctx, sqlPutN)
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}
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res, err = tx.stmt.putN.QueryContext(ctx, ver, key, val)
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return one(res, err)
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default:
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// Get the item at the key
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if tx.stmt.get == nil {
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tx.stmt.get, _ = tx.pntr.PrepareContext(ctx, sqlGet)
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}
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res, err = tx.stmt.get.QueryContext(ctx, ver, key)
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if err != nil {
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return nil, err
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}
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now, err = one(res, err)
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if err != nil {
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return nil, err
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}
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// Check if the values match
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if !check(now.Val(), exp) {
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return nil, ErrTxNotExpectedValue
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}
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// If they match then delete
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if tx.stmt.del == nil {
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tx.stmt.put, _ = tx.pntr.PrepareContext(ctx, sqlPut)
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}
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res, err = tx.stmt.put.QueryContext(ctx, ver, key, val, val)
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return one(res, err)
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}
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}
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