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connection_manager.go
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connection_manager.go
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// Licensed to LinDB under one or more contributor
// license agreements. See the NOTICE file distributed with
// this work for additional information regarding copyright
// ownership. LinDB 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 rpc
import (
"io"
"sync"
"github.com/lindb/lindb/models"
"github.com/lindb/lindb/pkg/logger"
)
//go:generate mockgen -source ./connection_manager.go -destination=./connection_manager_mock.go -package=rpc
// ConnectionManager represents grpc connection manager.
type ConnectionManager interface {
io.Closer
// CreateConnection creates a grpc connection.
CreateConnection(target models.Node)
// CloseConnection closes a grpc connection.
CloseConnection(target models.Node)
}
// connectionManager implements ConnectionManager interface.
type connectionManager struct {
connections map[string]struct{}
taskClientFct TaskClientFactory
mutex sync.Mutex
logger *logger.Logger
}
// NewConnectionManager creates a ConnectionManager instance.
func NewConnectionManager(taskClientFct TaskClientFactory) ConnectionManager {
return &connectionManager{
taskClientFct: taskClientFct,
connections: make(map[string]struct{}),
logger: logger.GetLogger("RPC", "ConnectionManager"),
}
}
// CreateConnection creates a grpc connection, if success cache the connection.
func (m *connectionManager) CreateConnection(target models.Node) {
m.mutex.Lock()
defer m.mutex.Unlock()
nodeID := target.Indicator()
if _, ok := m.connections[nodeID]; ok {
// connection exist, return it
return
}
if err := m.taskClientFct.CreateTaskClient(target); err == nil {
m.logger.Info("established connection successfully",
logger.String("target", nodeID),
)
m.connections[target.Indicator()] = struct{}{}
} else {
m.logger.Error("failed to establish connection",
logger.String("target", nodeID),
logger.Error(err),
)
// if connection failure, remove target from cache
delete(m.connections, target.Indicator())
}
}
// CloseConnection closes a grpc connection by given target server.
func (m *connectionManager) CloseConnection(target models.Node) {
m.mutex.Lock()
defer m.mutex.Unlock()
m.closeConnection(target.Indicator())
}
// Close closes connection manager, clean all grpc connections.
func (m *connectionManager) Close() error {
m.mutex.Lock()
defer m.mutex.Unlock()
for target := range m.connections {
m.closeConnection(target)
}
return nil
}
// closeConnection closes a grpc connection, then clear the cache for target server.
func (m *connectionManager) closeConnection(target string) {
closed, err := m.taskClientFct.CloseTaskClient(target)
delete(m.connections, target)
if closed {
if err == nil {
m.logger.Info("closed connection successfully",
logger.String("target", target),
)
} else {
m.logger.Error("failed to close connection",
logger.String("target", target),
logger.Error(err),
)
}
} else {
m.logger.Debug("unable to close a non-existent connection",
logger.String("target", target),
)
}
}