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// Copyright 2016 PingCAP, Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// See the License for the specific language governing permissions and
// limitations under the License.
package kv
import (
"context"
"github.com/pingcap/tidb/kv/memdb"
"github.com/pingcap/tidb/store/tikv/oracle"
)
// mockTxn is a txn that returns a retryAble error when called Commit.
type mockTxn struct {
opts map[Option]interface{}
valid bool
}
// Commit always returns a retryable error.
func (t *mockTxn) Commit(ctx context.Context) error {
return ErrTxnRetryable
}
func (t *mockTxn) Rollback() error {
t.valid = false
return nil
}
func (t *mockTxn) String() string {
return ""
}
func (t *mockTxn) LockKeys(_ context.Context, _ *LockCtx, _ ...Key) error {
return nil
}
func (t *mockTxn) SetOption(opt Option, val interface{}) {
t.opts[opt] = val
}
func (t *mockTxn) DelOption(opt Option) {
delete(t.opts, opt)
}
func (t *mockTxn) GetOption(opt Option) interface{} {
return t.opts[opt]
}
func (t *mockTxn) IsReadOnly() bool {
return true
}
func (t *mockTxn) StartTS() uint64 {
return uint64(0)
}
func (t *mockTxn) Get(ctx context.Context, k Key) ([]byte, error) {
return nil, nil
}
func (t *mockTxn) BatchGet(ctx context.Context, keys []Key) (map[string][]byte, error) {
return nil, nil
}
func (t *mockTxn) Iter(k Key, upperBound Key) (Iterator, error) {
return nil, nil
}
func (t *mockTxn) IterReverse(k Key) (Iterator, error) {
return nil, nil
}
func (t *mockTxn) Set(k Key, v []byte) error {
return nil
}
func (t *mockTxn) Delete(k Key) error {
return nil
}
func (t *mockTxn) Valid() bool {
return t.valid
}
func (t *mockTxn) Len() int {
return 0
}
func (t *mockTxn) Size() int {
return 0
}
func (t *mockTxn) GetMemBuffer() MemBuffer {
return nil
}
func (t *mockTxn) GetMemBufferSnapshot() MemBuffer {
return nil
}
func (t *mockTxn) GetSnapshot() Snapshot {
return nil
}
func (t *mockTxn) NewStagingBuffer() MemBuffer {
return nil
}
func (t *mockTxn) Flush() (int, error) {
return 0, nil
}
func (t *mockTxn) Discard() {
}
func (t *mockTxn) Reset() {
t.valid = false
}
func (t *mockTxn) SetVars(vars *Variables) {
}
func (t *mockTxn) GetVars() *Variables {
return nil
}
func (t *mockTxn) ResetStmtKeyExistErrs() {
}
func (t *mockTxn) MergeStmtKeyExistErrs() {
}
func (t *mockTxn) DeleteWithNeedLock(k Key) error {
return t.Delete(k)
}
func (t *mockTxn) GetFlags(ctx context.Context, k Key) memdb.KeyFlags {
return 0
}
// NewMockTxn new a mockTxn.
func NewMockTxn() Transaction {
return &mockTxn{
opts: make(map[Option]interface{}),
valid: true,
}
}
// mockStorage is used to start a must commit-failed txn.
type mockStorage struct {
}
func (s *mockStorage) Begin() (Transaction, error) {
return NewMockTxn(), nil
}
func (*mockTxn) IsPessimistic() bool {
return false
}
// BeginWithStartTS begins a transaction with startTS.
func (s *mockStorage) BeginWithStartTS(startTS uint64) (Transaction, error) {
return s.Begin()
}
func (s *mockStorage) GetSnapshot(ver Version) (Snapshot, error) {
return &mockSnapshot{
store: NewMemDbBuffer(),
}, nil
}
func (s *mockStorage) Close() error {
return nil
}
func (s *mockStorage) UUID() string {
return ""
}
// CurrentVersion returns current max committed version.
func (s *mockStorage) CurrentVersion() (Version, error) {
return NewVersion(1), nil
}
func (s *mockStorage) GetClient() Client {
return nil
}
func (s *mockStorage) GetOracle() oracle.Oracle {
return nil
}
func (s *mockStorage) SupportDeleteRange() (supported bool) {
return false
}
func (s *mockStorage) Name() string {
return "KVMockStorage"
}
func (s *mockStorage) Describe() string {
return "KVMockStorage is a mock Store implementation, only for unittests in KV package"
}
func (s *mockStorage) ShowStatus(ctx context.Context, key string) (interface{}, error) {
return nil, nil
}
// MockTxn is used for test cases that need more interfaces than Transaction.
type MockTxn interface {
Transaction
GetOption(opt Option) interface{}
}
// NewMockStorage creates a new mockStorage.
func NewMockStorage() Storage {
return &mockStorage{}
}
type mockSnapshot struct {
store MemBuffer
}
func (s *mockSnapshot) Get(ctx context.Context, k Key) ([]byte, error) {
return s.store.Get(ctx, k)
}
func (s *mockSnapshot) SetPriority(priority int) {
}
func (s *mockSnapshot) BatchGet(ctx context.Context, keys []Key) (map[string][]byte, error) {
m := make(map[string][]byte, len(keys))
for _, k := range keys {
v, err := s.store.Get(ctx, k)
if IsErrNotFound(err) {
continue
}
if err != nil {
return nil, err
}
m[string(k)] = v
}
return m, nil
}
func (s *mockSnapshot) Iter(k Key, upperBound Key) (Iterator, error) {
return s.store.Iter(k, upperBound)
}
func (s *mockSnapshot) IterReverse(k Key) (Iterator, error) {
return s.store.IterReverse(k)
}
func (s *mockSnapshot) SetOption(opt Option, val interface{}) {}
func (s *mockSnapshot) DelOption(opt Option) {}