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144 lines
3.7 KiB
144 lines
3.7 KiB
// Copyright 2016 PingCAP, Inc.
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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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// See the License for the specific language governing permissions and
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// limitations under the License.
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package kv
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import (
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"context"
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"sync"
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)
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// InjectionConfig is used for fault injections for KV components.
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type InjectionConfig struct {
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sync.RWMutex
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getError error // kv.Get() always return this error.
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commitError error // Transaction.Commit() always return this error.
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}
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// SetGetError injects an error for all kv.Get() methods.
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func (c *InjectionConfig) SetGetError(err error) {
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c.Lock()
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defer c.Unlock()
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c.getError = err
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}
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// SetCommitError injects an error for all Transaction.Commit() methods.
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func (c *InjectionConfig) SetCommitError(err error) {
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c.Lock()
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defer c.Unlock()
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c.commitError = err
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}
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// InjectedStore wraps a Storage with injections.
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type InjectedStore struct {
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Storage
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cfg *InjectionConfig
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}
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// NewInjectedStore creates a InjectedStore with config.
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func NewInjectedStore(store Storage, cfg *InjectionConfig) Storage {
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return &InjectedStore{
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Storage: store,
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cfg: cfg,
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}
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}
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// Begin creates an injected Transaction.
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func (s *InjectedStore) Begin() (Transaction, error) {
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txn, err := s.Storage.Begin()
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return &InjectedTransaction{
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Transaction: txn,
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cfg: s.cfg,
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}, err
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}
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// BeginWithStartTS creates an injected Transaction with startTS.
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func (s *InjectedStore) BeginWithStartTS(startTS uint64) (Transaction, error) {
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txn, err := s.Storage.BeginWithStartTS(startTS)
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return &InjectedTransaction{
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Transaction: txn,
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cfg: s.cfg,
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}, err
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}
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// GetSnapshot creates an injected Snapshot.
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func (s *InjectedStore) GetSnapshot(ver Version) (Snapshot, error) {
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snapshot, err := s.Storage.GetSnapshot(ver)
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return &InjectedSnapshot{
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Snapshot: snapshot,
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cfg: s.cfg,
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}, err
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}
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// InjectedTransaction wraps a Transaction with injections.
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type InjectedTransaction struct {
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Transaction
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cfg *InjectionConfig
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}
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// Get returns an error if cfg.getError is set.
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func (t *InjectedTransaction) Get(ctx context.Context, k Key) ([]byte, error) {
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t.cfg.RLock()
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defer t.cfg.RUnlock()
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if t.cfg.getError != nil {
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return nil, t.cfg.getError
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}
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return t.Transaction.Get(ctx, k)
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}
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// BatchGet returns an error if cfg.getError is set.
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func (t *InjectedTransaction) BatchGet(ctx context.Context, keys []Key) (map[string][]byte, error) {
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t.cfg.RLock()
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defer t.cfg.RUnlock()
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if t.cfg.getError != nil {
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return nil, t.cfg.getError
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}
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return t.Transaction.BatchGet(ctx, keys)
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}
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// Commit returns an error if cfg.commitError is set.
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func (t *InjectedTransaction) Commit(ctx context.Context) error {
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t.cfg.RLock()
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defer t.cfg.RUnlock()
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if t.cfg.commitError != nil {
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return t.cfg.commitError
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}
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return t.Transaction.Commit(ctx)
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}
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// InjectedSnapshot wraps a Snapshot with injections.
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type InjectedSnapshot struct {
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Snapshot
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cfg *InjectionConfig
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}
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// Get returns an error if cfg.getError is set.
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func (t *InjectedSnapshot) Get(ctx context.Context, k Key) ([]byte, error) {
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t.cfg.RLock()
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defer t.cfg.RUnlock()
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if t.cfg.getError != nil {
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return nil, t.cfg.getError
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}
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return t.Snapshot.Get(ctx, k)
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}
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// BatchGet returns an error if cfg.getError is set.
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func (t *InjectedSnapshot) BatchGet(ctx context.Context, keys []Key) (map[string][]byte, error) {
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t.cfg.RLock()
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defer t.cfg.RUnlock()
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if t.cfg.getError != nil {
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return nil, t.cfg.getError
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}
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return t.Snapshot.BatchGet(ctx, keys)
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}
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