/
kill.go
124 lines (106 loc) · 2.42 KB
/
kill.go
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package commands
import (
"flag"
"fmt"
"log"
"net"
"strings"
"time"
"github.com/hashicorp/consul/api"
"github.com/mitchellh/cli"
)
func KillCommandFactory() (cli.Command, error) {
return &Kill{}, nil
}
type Kill struct {
}
func (c *Kill) Help() string {
helpText := `
Usage consul-live kill -token=<token>
`
return strings.TrimSpace(helpText)
}
func (c *Kill) Synopsis() string {
return "Kills the current leader once the cluster is stable"
}
func (c *Kill) Run(args []string) int {
var token string
cmdFlags := flag.NewFlagSet("kill", flag.ContinueOnError)
cmdFlags.Usage = func() { log.Println(c.Help()) }
cmdFlags.StringVar(&token, "token", "", "")
if err := cmdFlags.Parse(args); err != nil {
return 1
}
config := func() *api.Config {
c := api.DefaultConfig()
c.Token = token
return c
}
if err := c.run(config); err != nil {
log.Println(err)
return 1
}
return 0
}
func (c *Kill) run(config func() *api.Config) error {
client, err := api.NewClient(config())
if err != nil {
return err
}
// Set a default Autopilot configuration that makes recovery quicker.
ap, err := client.Operator().AutopilotGetConfiguration(nil)
if err != nil {
return err
}
ap.ServerStabilizationTime = api.NewReadableDuration(1 * time.Second)
if ok, err := client.Operator().AutopilotCASConfiguration(ap, nil); !ok || err != nil {
return err
}
delay := func() {
time.Sleep(2 * time.Second)
}
// Wait for the cluster to be able to take a fault and then ask the
// current leader to leave.
for {
sh, err := client.Operator().AutopilotServerHealth(nil)
if err != nil {
log.Printf("Could not get cluster health (will retry): %v", err)
delay()
continue
}
if sh.FailureTolerance < 1 {
log.Printf("Cluster can't tolerate a failure (will retry)")
delay()
continue
}
var leader string
for _, server := range sh.Servers {
if server.Leader {
leader = server.Address
break
}
}
if leader == "" {
log.Printf("Cluster doesn't have a leader (will retry)")
delay()
continue
}
log.Printf("Attempting to kill %q...", leader)
c := config()
host, _, err := net.SplitHostPort(leader)
if err != nil {
return err
}
c.Address = fmt.Sprintf("%s:%d", host, 8500)
tc, err := api.NewClient(c)
if err != nil {
return err
}
if err := tc.Agent().Leave(); err != nil {
log.Printf("Failed to leave for %q: %v", leader, err)
delay()
continue
}
}
return nil
}