// CreateSession creates a new session environment.
func CreateSession(store kv.Storage) (Session, error) {
	s := &session{
		values: make(map[fmt.Stringer]interface{}),
		store:  store,
		sid:    atomic.AddInt64(&sessionID, 1),
	}
	domain, err := domap.Get(store)
	if err != nil {
		return nil, err
	}
	sessionctx.BindDomain(s, domain)

	variable.BindSessionVars(s)
	variable.GetSessionVars(s).SetStatusFlag(mysql.ServerStatusAutocommit, true)

	// session implements variable.GlobalVarAccessor. Bind it to ctx.
	variable.BindGlobalVarAccessor(s, s)

	// session implements autocommit.Checker. Bind it to ctx
	autocommit.BindAutocommitChecker(s, s)
	sessionMu.Lock()
	defer sessionMu.Unlock()

	_, ok := storeBootstrapped[store.UUID()]
	if !ok {
		s.initing = true
		bootstrap(s)
		s.initing = false
		storeBootstrapped[store.UUID()] = true
	}
	// TODO: Add auth here
	privChecker := &privileges.UserPrivileges{}
	privilege.BindPrivilegeChecker(s, privChecker)
	return s, nil
}

// CreateSession creates a new session environment.
func CreateSession(store kv.Storage) (Session, error) {
	s := &session{
		values:      make(map[fmt.Stringer]interface{}),
		store:       store,
		sid:         atomic.AddInt64(&sessionID, 1),
		debugInfos:  make(map[string]interface{}),
		maxRetryCnt: 10,
		parser:      parser.New(),
	}
	domain, err := domap.Get(store)
	if err != nil {
		return nil, errors.Trace(err)
	}
	sessionctx.BindDomain(s, domain)

	variable.BindSessionVars(s)
	variable.GetSessionVars(s).SetStatusFlag(mysql.ServerStatusAutocommit, true)

	// session implements variable.GlobalVarAccessor. Bind it to ctx.
	variable.BindGlobalVarAccessor(s, s)

	// session implements autocommit.Checker. Bind it to ctx
	autocommit.BindAutocommitChecker(s, s)
	sessionMu.Lock()
	defer sessionMu.Unlock()

	ver := getStoreBootstrapVersion(store)
	if ver == notBootstrapped {
		// if no bootstrap and storage is remote, we must use a little lease time to
		// bootstrap quickly, after bootstrapped, we will reset the lease time.
		// TODO: Using a bootstap tool for doing this may be better later.
		if !localstore.IsLocalStore(store) {
			sessionctx.GetDomain(s).SetLease(chooseMinLease(100*time.Millisecond, schemaLease))
		}

		s.SetValue(context.Initing, true)
		bootstrap(s)
		s.ClearValue(context.Initing)

		if !localstore.IsLocalStore(store) {
			sessionctx.GetDomain(s).SetLease(schemaLease)
		}

		finishBootstrap(store)
	} else if ver < currentBootstrapVersion {
		s.SetValue(context.Initing, true)
		upgrade(s)
		s.ClearValue(context.Initing)
	}

	// TODO: Add auth here
	privChecker := &privileges.UserPrivileges{}
	privilege.BindPrivilegeChecker(s, privChecker)
	return s, nil
}

// Create a new session on store but only do ddl works.
func (s *testSessionSuite) bootstrapWithError(store kv.Storage, c *C) {
	ss := &session{
		values: make(map[fmt.Stringer]interface{}),
		store:  store,
		sid:    atomic.AddInt64(&sessionID, 1),
	}
	domain, err := domap.Get(store)
	c.Assert(err, IsNil)
	sessionctx.BindDomain(ss, domain)
	variable.BindSessionVars(ss)
	variable.GetSessionVars(ss).SetStatusFlag(mysql.ServerStatusAutocommit, true)
	// session implements autocommit.Checker. Bind it to ctx
	autocommit.BindAutocommitChecker(ss, ss)
	sessionMu.Lock()
	defer sessionMu.Unlock()
	b, err := checkBootstrapped(ss)
	c.Assert(b, IsFalse)
	c.Assert(err, IsNil)
	doDDLWorks(ss)
	// Leave dml unfinished.
}