forked from sorintlab/stolon
/
register.go
197 lines (172 loc) · 6.45 KB
/
register.go
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// Copyright 2019 Sorint.lab
//
// 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,
// 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 cmd
import (
"fmt"
"os"
"os/signal"
"syscall"
"time"
"github.com/deepdivenow/stolon/cmd"
"github.com/deepdivenow/stolon/cmd/stolonctl/cmd/register"
slog "github.com/deepdivenow/stolon/internal/log"
"github.com/deepdivenow/stolon/internal/store"
"github.com/spf13/cobra"
"go.uber.org/zap"
)
//Register command to register stolon master and slave for service discovery
var Register = &cobra.Command{
Use: "register",
Short: "Register stolon keepers for service discovery",
Run: runRegister,
Version: cmd.Version,
}
var rCfg register.Config
var log = slog.S()
func init() {
Register.PersistentFlags().StringVar(&rCfg.Backend, "register-backend", "consul", "register backend type (consul)")
Register.PersistentFlags().StringVar(&rCfg.Endpoints, "register-endpoints", "http://127.0.0.1:8500", "a comma-delimited list of register endpoints (use https scheme for tls communication) defaults: http://127.0.0.1:8500 for consul")
Register.PersistentFlags().StringVar(&rCfg.TLSCertFile, "register-cert-file", "", "certificate file for client identification to the register")
Register.PersistentFlags().StringVar(&rCfg.TLSKeyFile, "register-key", "", "private key file for client identification to the register")
Register.PersistentFlags().BoolVar(&rCfg.TLSInsecureSkipVerify, "register-skip-tls-verify", false, "skip register certificate verification (insecure!!!)")
Register.PersistentFlags().StringVar(&rCfg.TLSCAFile, "register-ca-file", "", "verify certificates of HTTPS-enabled register servers using this CA bundle")
Register.PersistentFlags().BoolVar(&rCfg.RegisterMaster, "register-master", false, "register master as well for service discovery (use it with caution!!!)")
Register.PersistentFlags().StringVar(&rCfg.TagMasterAs, "tag-master-as", "master", "a comma-delimited list of tag to be used when registering master")
Register.PersistentFlags().StringVar(&rCfg.TagSlaveAs, "tag-slave-as", "slave", "a comma-delimited list of tag to be used when registering slave")
Register.PersistentFlags().BoolVar(&cfg.Debug, "debug", false, "enable debug logging")
Register.PersistentFlags().IntVar(&rCfg.SleepInterval, "sleep-interval", 10, "number of seconds to sleep before probing for change")
CmdStolonCtl.AddCommand(Register)
}
func sleepInterval() time.Duration {
return time.Duration(rCfg.SleepInterval) * time.Second
}
func checkConfig(cfg *config, rCfg *register.Config) error {
if err := cmd.CheckCommonConfig(&cfg.CommonConfig); err != nil {
return err
}
return rCfg.Validate()
}
func runRegister(c *cobra.Command, _ []string) {
switch cfg.LogLevel {
case "error":
slog.SetLevel(zap.ErrorLevel)
case "warn":
slog.SetLevel(zap.WarnLevel)
case "info":
slog.SetLevel(zap.InfoLevel)
case "debug":
slog.SetLevel(zap.DebugLevel)
default:
die("invalid log level: %v", cfg.LogLevel)
}
if cfg.Debug {
slog.SetDebug()
}
if cmd.IsColorLoggerEnable(c, &cfg.CommonConfig) {
log = slog.SColor()
}
if err := checkConfig(&cfg, &rCfg); err != nil {
die(err.Error())
}
sigs := make(chan os.Signal, 1)
signal.Notify(sigs, syscall.SIGINT, syscall.SIGTERM)
if err := registerCluster(sigs, &cfg, &rCfg); err != nil {
die(err.Error())
}
}
func registerCluster(sigs chan os.Signal, cfg *config, rCfg *register.Config) error {
s, err := cmd.NewStore(&cfg.CommonConfig)
if err != nil {
return err
}
endCh := make(chan struct{})
timerCh := time.NewTimer(0).C
service, err := register.NewServiceDiscovery(rCfg)
if err != nil {
return err
}
for {
select {
case <-sigs:
return nil
case <-timerCh:
go func() {
checkAndRegisterMasterAndSlaves(cfg.ClusterName, s, service, rCfg.RegisterMaster)
endCh <- struct{}{}
}()
case <-endCh:
timerCh = time.NewTimer(sleepInterval()).C
}
}
}
func checkAndRegisterMasterAndSlaves(clusterName string, store store.Store, discovery register.ServiceDiscovery, registerMaster bool) {
discoveredServices, err := discovery.Services(clusterName)
if err != nil {
log.Errorf("unable to get info about existing services: %v", err)
return
}
existingServices, err := getExistingServices(clusterName, store, registerMaster)
if err == nil {
log.Debugf("found services %v", existingServices)
} else {
log.Errorf("%s skipping", err.Error())
return
}
diff := existingServices.Diff(discoveredServices)
for _, removed := range diff.Removed {
deRegisterService(discovery, &removed)
}
for _, added := range diff.Added {
registerService(discovery, &added)
}
}
func getExistingServices(clusterName string, store store.Store, includeMaster bool) (register.ServiceInfos, error) {
cluster, err := register.NewCluster(clusterName, rCfg, store)
if err != nil {
return nil, fmt.Errorf("cannot get cluster data: %v", err)
}
result := register.ServiceInfos{}
infos, err := cluster.ServiceInfos()
if err != nil {
return nil, fmt.Errorf("cannot get service infos: %v", err)
}
for uid, info := range infos {
if !includeMaster && info.IsMaster {
log.Infof("skipping registering master")
continue
}
result[uid] = info
}
return result, nil
}
func registerService(service register.ServiceDiscovery, serviceInfo *register.ServiceInfo) {
if serviceInfo == nil {
return
}
if err := service.Register(serviceInfo); err != nil {
log.Errorf("unable to register %s with uid %s as %v, reason: %s", serviceInfo.Name, serviceInfo.ID, serviceInfo.Tags, err.Error())
} else {
log.Infof("successfully registered %s with uid %s as %v", serviceInfo.Name, serviceInfo.ID, serviceInfo.Tags)
}
}
func deRegisterService(service register.ServiceDiscovery, serviceInfo *register.ServiceInfo) {
if serviceInfo == nil {
return
}
if err := service.DeRegister(serviceInfo); err != nil {
log.Errorf("unable to deregister %s with uid %s as %v, reason: %s", serviceInfo.Name, serviceInfo.ID, serviceInfo.Tags, err.Error())
} else {
log.Infof("successfully deregistered %s with uid %s as %v", serviceInfo.Name, serviceInfo.ID, serviceInfo.Tags)
}
}