milvus/internal/datacoord/session.go

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// Licensed to the LF AI & Data foundation under one
// or more contributor license agreements. See the NOTICE file
// distributed with this work for additional information
// regarding copyright ownership. The ASF licenses this file
// to you 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,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package datacoord
import (
"context"
"fmt"
"sync"
"github.com/cockroachdb/errors"
"github.com/milvus-io/milvus/internal/types"
)
var errDisposed = errors.New("client is disposed")
// NodeInfo contains node base info
type NodeInfo struct {
NodeID int64
Address string
}
// Session contains session info of a node
type Session struct {
sync.Mutex
info *NodeInfo
client types.DataNodeClient
clientCreator dataNodeCreatorFunc
isDisposed bool
}
// NewSession creates a new session
func NewSession(info *NodeInfo, creator dataNodeCreatorFunc) *Session {
return &Session{
info: info,
clientCreator: creator,
}
}
// GetOrCreateClient gets or creates a new client for session
func (n *Session) GetOrCreateClient(ctx context.Context) (types.DataNodeClient, error) {
n.Lock()
defer n.Unlock()
if n.isDisposed {
return nil, errDisposed
}
if n.client != nil {
return n.client, nil
}
if n.clientCreator == nil {
return nil, fmt.Errorf("unable to create client for %s because of a nil client creator", n.info.Address)
}
err := n.initClient(ctx)
return n.client, err
}
func (n *Session) initClient(ctx context.Context) (err error) {
if n.client, err = n.clientCreator(ctx, n.info.Address, n.info.NodeID); err != nil {
return
}
return nil
}
// Dispose releases client connection
func (n *Session) Dispose() {
n.Lock()
defer n.Unlock()
if n.client != nil {
n.client.Close()
n.client = nil
}
n.isDisposed = true
}