Golang Storage.UUID方法代码示例

// 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
}

func isBoostrapped(store kv.Storage) bool {
	// check in memory
	_, ok := storeBootstrapped[store.UUID()]
	if ok {
		return true
	}

	// check in kv store
	err := kv.RunInNewTxn(store, false, func(txn kv.Transaction) error {
		var err error
		t := meta.NewMeta(txn)
		ok, err = t.IsBootstrapped()
		return errors.Trace(err)
	})

	if err != nil {
		log.Fatalf("check bootstrapped err %v", err)
	}

	if ok {
		// here mean memory is not ok, but other server has already finished it
		storeBootstrapped[store.UUID()] = true
	}

	return ok
}

func getStoreBootstrapVersion(store kv.Storage) int64 {
	// check in memory
	_, ok := storeBootstrapped[store.UUID()]
	if ok {
		return currentBootstrapVersion
	}

	var ver int64
	// check in kv store
	err := kv.RunInNewTxn(store, false, func(txn kv.Transaction) error {
		var err error
		t := meta.NewMeta(txn)
		ver, err = t.GetBootstrapVersion()
		return errors.Trace(err)
	})

	if err != nil {
		log.Fatalf("check bootstrapped err %v", err)
	}

	if ver > notBootstrapped {
		// here mean memory is not ok, but other server has already finished it
		storeBootstrapped[store.UUID()] = true
	}

	return ver
}

// 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)
	sessionMu.Lock()
	defer sessionMu.Unlock()

	_, ok := storeBootstrapped[store.UUID()]
	if !ok {
		bootstrap(s)
		storeBootstrapped[store.UUID()] = true
	}
	// Add auth here
	return s, nil
}

func (dm *domainMap) Get(store kv.Storage) (d *domain.Domain, err error) {
	key := store.UUID()
	dm.mu.Lock()
	defer dm.mu.Unlock()
	d = dm.domains[key]
	if d != nil {
		return
	}

	if SchemaLease <= minSchemaLease {
		SchemaLease = minSchemaLease
	}

	lease := SchemaLease
	// if storage is local storage, we may in test environment or
	// run server in single machine mode, so we don't need wait
	// 2 * lease time for DDL operation.
	if localstore.IsLocalStore(store) {
		lease = 0
	}
	d, err = domain.NewDomain(store, lease)
	if err != nil {
		return nil, errors.Trace(err)
	}
	dm.domains[key] = d
	return
}

func finishBoostrap(store kv.Storage) {
	storeBootstrapped[store.UUID()] = true

	err := kv.RunInNewTxn(store, true, func(txn kv.Transaction) error {
		t := meta.NewMeta(txn)
		err := t.FinishBootstrap()
		return errors.Trace(err)
	})
	if err != nil {
		log.Fatalf("finish bootstrap err %v", err)
	}
}

func (dm *domainMap) Get(store kv.Storage) (d *domain.Domain, err error) {
	key := store.UUID()
	dm.mu.Lock()
	defer dm.mu.Unlock()
	d = dm.domains[key]
	if d != nil {
		return
	}
	d, err = domain.NewDomain(store)
	if err != nil {
		return nil, errors.Trace(err)
	}
	dm.domains[key] = d
	return
}

func (dm *domainMap) Get(store kv.Storage) (d *domain.Domain, err error) {
	key := store.UUID()
	dm.mu.Lock()
	defer dm.mu.Unlock()
	d = dm.domains[key]
	if d != nil {
		return
	}

	lease := time.Duration(0)
	if !localstore.IsLocalStore(store) {
		lease = schemaLease
	}
	d, err = domain.NewDomain(store, lease)
	if err != nil {
		return nil, errors.Trace(err)
	}
	dm.domains[key] = d
	return
}

func (dm *domainMap) Get(store kv.Storage) (d *domain.Domain, err error) {
	key := store.UUID()
	dm.mu.Lock()
	defer dm.mu.Unlock()
	d = dm.domains[key]
	if d != nil {
		return
	}

	lease := time.Duration(0)
	if !localstore.IsLocalStore(store) {
		lease = schemaLease
	}
	err = util.RunWithRetry(defaultMaxRetries, retryInterval, func() (retry bool, err1 error) {
		d, err1 = domain.NewDomain(store, lease)
		return true, errors.Trace(err1)
	})
	if err != nil {
		return nil, errors.Trace(err)
	}
	dm.domains[key] = d
	return
}

func (dm *domainMap) Delete(store kv.Storage) {
	dm.mu.Lock()
	delete(dm.domains, store.UUID())
	dm.mu.Unlock()
}