276 lines
7.6 KiB
Go
276 lines
7.6 KiB
Go
// Copyright 2015 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 mock is just for test only.
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package mock
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import (
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"context"
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"fmt"
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"sync"
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"time"
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"github.com/pingcap/errors"
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"github.com/pingcap/parser/model"
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"github.com/pingcap/tidb/kv"
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"github.com/pingcap/tidb/owner"
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"github.com/pingcap/tidb/sessionctx"
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"github.com/pingcap/tidb/sessionctx/variable"
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"github.com/pingcap/tidb/types"
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"github.com/pingcap/tidb/util"
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"github.com/pingcap/tidb/util/kvcache"
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"github.com/pingcap/tidb/util/sqlexec"
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binlog "github.com/pingcap/tipb/go-binlog"
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)
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var _ sessionctx.Context = (*Context)(nil)
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var _ sqlexec.SQLExecutor = (*Context)(nil)
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// Context represents mocked sessionctx.Context.
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type Context struct {
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values map[fmt.Stringer]interface{}
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txn wrapTxn // mock global variable
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Store kv.Storage // mock global variable
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sessionVars *variable.SessionVars
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mux sync.Mutex // fix data race in ddl test.
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ctx context.Context
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cancel context.CancelFunc
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sm util.SessionManager
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pcache *kvcache.SimpleLRUCache
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}
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type wrapTxn struct {
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kv.Transaction
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}
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func (txn *wrapTxn) Valid() bool {
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return txn.Transaction != nil && txn.Transaction.Valid()
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}
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// Execute implements sqlexec.SQLExecutor Execute interface.
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func (c *Context) Execute(ctx context.Context, sql string) ([]sqlexec.RecordSet, error) {
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return nil, errors.Errorf("Not Support.")
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}
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// DDLOwnerChecker returns owner.DDLOwnerChecker.
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func (c *Context) DDLOwnerChecker() owner.DDLOwnerChecker {
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return nil
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}
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// SetValue implements sessionctx.Context SetValue interface.
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func (c *Context) SetValue(key fmt.Stringer, value interface{}) {
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c.values[key] = value
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}
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// Value implements sessionctx.Context Value interface.
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func (c *Context) Value(key fmt.Stringer) interface{} {
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value := c.values[key]
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return value
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}
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// ClearValue implements sessionctx.Context ClearValue interface.
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func (c *Context) ClearValue(key fmt.Stringer) {
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delete(c.values, key)
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}
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// GetSessionVars implements the sessionctx.Context GetSessionVars interface.
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func (c *Context) GetSessionVars() *variable.SessionVars {
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return c.sessionVars
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}
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// Txn implements sessionctx.Context Txn interface.
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func (c *Context) Txn(bool) (kv.Transaction, error) {
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return &c.txn, nil
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}
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// GetClient implements sessionctx.Context GetClient interface.
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func (c *Context) GetClient() kv.Client {
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if c.Store == nil {
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return nil
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}
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return c.Store.GetClient()
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}
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// GetGlobalSysVar implements GlobalVarAccessor GetGlobalSysVar interface.
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func (c *Context) GetGlobalSysVar(ctx sessionctx.Context, name string) (string, error) {
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v := variable.GetSysVar(name)
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if v == nil {
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return "", variable.UnknownSystemVar.GenWithStackByArgs(name)
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}
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return v.Value, nil
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}
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// SetGlobalSysVar implements GlobalVarAccessor SetGlobalSysVar interface.
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func (c *Context) SetGlobalSysVar(ctx sessionctx.Context, name string, value string) error {
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v := variable.GetSysVar(name)
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if v == nil {
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return variable.UnknownSystemVar.GenWithStackByArgs(name)
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}
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v.Value = value
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return nil
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}
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// PreparedPlanCache implements the sessionctx.Context interface.
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func (c *Context) PreparedPlanCache() *kvcache.SimpleLRUCache {
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return c.pcache
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}
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// NewTxn implements the sessionctx.Context interface.
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func (c *Context) NewTxn(context.Context) error {
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if c.Store == nil {
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return errors.New("store is not set")
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}
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if c.txn.Valid() {
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err := c.txn.Commit(c.ctx)
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if err != nil {
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return errors.Trace(err)
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}
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}
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txn, err := c.Store.Begin()
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if err != nil {
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return errors.Trace(err)
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}
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c.txn.Transaction = txn
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return nil
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}
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// RefreshTxnCtx implements the sessionctx.Context interface.
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func (c *Context) RefreshTxnCtx(ctx context.Context) error {
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return errors.Trace(c.NewTxn(ctx))
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}
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// InitTxnWithStartTS implements the sessionctx.Context interface with startTS.
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func (c *Context) InitTxnWithStartTS(startTS uint64) error {
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if c.txn.Valid() {
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return nil
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}
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if c.Store != nil {
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membufCap := kv.DefaultTxnMembufCap
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if c.sessionVars.LightningMode {
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membufCap = kv.ImportingTxnMembufCap
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}
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txn, err := c.Store.BeginWithStartTS(startTS)
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if err != nil {
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return errors.Trace(err)
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}
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txn.SetCap(membufCap)
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c.txn.Transaction = txn
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}
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return nil
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}
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// GetStore gets the store of session.
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func (c *Context) GetStore() kv.Storage {
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return c.Store
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}
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// GetSessionManager implements the sessionctx.Context interface.
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func (c *Context) GetSessionManager() util.SessionManager {
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return c.sm
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}
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// SetSessionManager set the session manager.
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func (c *Context) SetSessionManager(sm util.SessionManager) {
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c.sm = sm
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}
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// Cancel implements the Session interface.
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func (c *Context) Cancel() {
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c.cancel()
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}
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// GoCtx returns standard sessionctx.Context that bind with current transaction.
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func (c *Context) GoCtx() context.Context {
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return c.ctx
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}
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// StoreQueryFeedback stores the query feedback.
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func (c *Context) StoreQueryFeedback(_ interface{}) {}
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// StmtCommit implements the sessionctx.Context interface.
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func (c *Context) StmtCommit() error {
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return nil
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}
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// StmtRollback implements the sessionctx.Context interface.
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func (c *Context) StmtRollback() {
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}
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// StmtGetMutation implements the sessionctx.Context interface.
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func (c *Context) StmtGetMutation(tableID int64) *binlog.TableMutation {
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return nil
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}
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// StmtAddDirtyTableOP implements the sessionctx.Context interface.
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func (c *Context) StmtAddDirtyTableOP(op int, tid int64, handle int64, row []types.Datum) {
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}
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// AddTableLock implements the sessionctx.Context interface.
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func (c *Context) AddTableLock(_ []model.TableLockTpInfo) {
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}
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// ReleaseTableLocks implements the sessionctx.Context interface.
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func (c *Context) ReleaseTableLocks(locks []model.TableLockTpInfo) {
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}
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// ReleaseTableLockByTableIDs implements the sessionctx.Context interface.
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func (c *Context) ReleaseTableLockByTableIDs(tableIDs []int64) {
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}
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// CheckTableLocked implements the sessionctx.Context interface.
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func (c *Context) CheckTableLocked(_ int64) (bool, model.TableLockType) {
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return false, model.TableLockNone
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}
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// GetAllTableLocks implements the sessionctx.Context interface.
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func (c *Context) GetAllTableLocks() []model.TableLockTpInfo {
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return nil
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}
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// ReleaseAllTableLocks implements the sessionctx.Context interface.
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func (c *Context) ReleaseAllTableLocks() {
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}
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// HasLockedTables implements the sessionctx.Context interface.
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func (c *Context) HasLockedTables() bool {
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return false
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}
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// Close implements the sessionctx.Context interface.
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func (c *Context) Close() {
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}
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// NewContext creates a new mocked sessionctx.Context.
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func NewContext() *Context {
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ctx, cancel := context.WithCancel(context.Background())
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sctx := &Context{
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values: make(map[fmt.Stringer]interface{}),
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sessionVars: variable.NewSessionVars(),
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ctx: ctx,
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cancel: cancel,
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}
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sctx.sessionVars.InitChunkSize = 2
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sctx.sessionVars.MaxChunkSize = 32
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sctx.sessionVars.StmtCtx.TimeZone = time.UTC
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sctx.sessionVars.GlobalVarsAccessor = variable.NewMockGlobalAccessor()
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if err := sctx.GetSessionVars().SetSystemVar(variable.MaxAllowedPacket, "67108864"); err != nil {
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panic(err)
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}
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return sctx
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}
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// HookKeyForTest is as alias, used by context.WithValue.
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// golint forbits using string type as key in context.WithValue.
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type HookKeyForTest string
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