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service_util.go
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service_util.go
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// Copyright 2022 PingCAP, Inc.
//
// Licensed 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,
// See the License for the specific language governing permissions and
// limitations under the License.
package servermaster
import (
"fmt"
"math/rand"
"sync"
"time"
"github.com/pingcap/log"
pb "github.com/pingcap/tiflow/engine/enginepb"
"github.com/pingcap/tiflow/engine/pkg/rpcutil"
"github.com/pingcap/tiflow/pkg/election"
"github.com/pingcap/tiflow/pkg/errors"
"go.uber.org/atomic"
"go.uber.org/zap"
"google.golang.org/grpc"
"google.golang.org/grpc/credentials/insecure"
)
func init() {
rand.Seed(time.Now().UnixNano())
}
func generateNodeID(name string) string {
val := rand.Uint32()
id := fmt.Sprintf("%s-%08x", name, val)
return id
}
// multiClient is an interface that implements all the Client interfaces
// for the individual services running on the server masters.
type multiClient interface {
pb.DiscoveryClient
pb.ResourceManagerClient
pb.TaskSchedulerClient
pb.JobManagerClient
}
type multiClientImpl struct {
pb.DiscoveryClient
pb.ResourceManagerClient
pb.TaskSchedulerClient
pb.JobManagerClient
}
func newMultiClient(conn *grpc.ClientConn) multiClient {
return &multiClientImpl{
DiscoveryClient: pb.NewDiscoveryClient(conn),
ResourceManagerClient: pb.NewResourceManagerClient(conn),
TaskSchedulerClient: pb.NewTaskSchedulerClient(conn),
JobManagerClient: pb.NewJobManagerClient(conn),
}
}
var leaderOnlyMethods = map[string]struct{}{
"ListExecutors": {},
"RegisterExecutor": {},
"Heartbeat": {},
"CreateJob": {},
"GetJob": {},
"ListJobs": {},
"CancelJob": {},
"DeleteJob": {},
"ScheduleTask": {},
}
var _ rpcutil.ForwardChecker[multiClient] = &forwardChecker{}
type forwardChecker struct {
elector election.Elector
rwm sync.RWMutex
conn *grpc.ClientConn
leaderCli multiClient
}
func newForwardChecker(elector election.Elector) *forwardChecker {
return &forwardChecker{
elector: elector,
}
}
func (f *forwardChecker) LeaderOnly(method string) bool {
_, ok := leaderOnlyMethods[method]
return ok
}
func (f *forwardChecker) IsLeader() bool {
return f.elector.IsLeader()
}
func (f *forwardChecker) LeaderClient() (multiClient, error) {
leader, ok := f.elector.GetLeader()
if !ok {
return nil, errors.ErrMasterNoLeader.GenWithStackByArgs()
}
return f.getOrCreateLeaderClient(leader.Address)
}
func (f *forwardChecker) getOrCreateLeaderClient(leaderAddr string) (multiClient, error) {
f.rwm.RLock()
if f.conn != nil && f.conn.Target() == leaderAddr {
f.rwm.RUnlock()
return f.leaderCli, nil
}
f.rwm.RUnlock()
f.rwm.Lock()
defer f.rwm.Unlock()
if f.conn != nil {
if f.conn.Target() == leaderAddr {
return f.leaderCli, nil
}
if err := f.conn.Close(); err != nil {
log.Warn("failed to close grpc connection", zap.Error(err))
}
f.conn = nil
}
conn, err := grpc.Dial(leaderAddr, grpc.WithTransportCredentials(insecure.NewCredentials()))
if err != nil {
return nil, errors.Cause(err)
}
f.conn = conn
f.leaderCli = newMultiClient(conn)
return f.leaderCli, nil
}
func (f *forwardChecker) Close() error {
f.rwm.Lock()
defer f.rwm.Unlock()
var err error
if f.conn != nil {
err = f.conn.Close()
f.conn = nil
}
f.leaderCli = nil
return err
}
// ensure featureDegrader implements rpcutil.FeatureChecker
var _ rpcutil.FeatureChecker = &featureDegrader{}
// featureDegrader is used to record whether a feature is available or degradation
// in server master.
type featureDegrader struct {
executorManager atomic.Bool
masterWorkerManager atomic.Bool
}
func newFeatureDegrader() *featureDegrader {
fd := &featureDegrader{}
fd.reset()
return fd
}
func (d *featureDegrader) updateExecutorManager(val bool) {
d.executorManager.Store(val)
}
func (d *featureDegrader) updateMasterWorkerManager(val bool) {
d.masterWorkerManager.Store(val)
}
func (d *featureDegrader) reset() {
d.executorManager.Store(false)
d.masterWorkerManager.Store(false)
}
// Available implements rpcutil.FeatureChecker
func (d *featureDegrader) Available(method string) bool {
switch method {
case "ListExecutors", "RegisterExecutor", "Heartbeat":
return d.executorManager.Load()
case "CreateJob", "GetJob", "ListJobs", "CancelJob", "DeleteJob",
"ScheduleTask":
return d.masterWorkerManager.Load()
}
return true
}