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control.go
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control.go
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package server
import (
"context"
"errors"
"fmt"
"os"
"strings"
"time"
"github.com/cybozu-go/cke"
"github.com/cybozu-go/cke/metrics"
"github.com/cybozu-go/cke/op"
"github.com/cybozu-go/log"
"github.com/cybozu-go/well"
clientv3 "go.etcd.io/etcd/client/v3"
"go.etcd.io/etcd/client/v3/concurrency"
)
var (
errCommandFailure = errors.New("command failed")
)
// Controller manage operations
type Controller struct {
session *concurrency.Session
addon Integrator
config *Config
}
// NewController construct controller instance
func NewController(s *concurrency.Session, addon Integrator, config *Config) Controller {
return Controller{s, addon, config}
}
// Run execute procedures with leader elections
func (c Controller) Run(ctx context.Context) error {
metrics.UpdateLeader(false)
hostname, err := os.Hostname()
if err != nil {
return err
}
e := concurrency.NewElection(c.session, cke.KeyLeader)
// When the etcd is stopping, the Campaign will hang up.
// So check the session and exit if the session is closed.
doneCh := make(chan error)
go func() {
doneCh <- e.Campaign(ctx, hostname)
}()
select {
case <-ctx.Done():
return ctx.Err()
case <-c.session.Done():
return errors.New("failed to campaign: session is closed")
case err := <-doneCh:
if err != nil {
return fmt.Errorf("failed to campaign: %s", err.Error())
}
}
leaderKey := e.Key()
log.Info("I am the leader", map[string]interface{}{
"session": c.session.Lease(),
})
metrics.UpdateLeader(true)
// Release the leader before terminating.
defer func() {
select {
case <-c.session.Done():
log.Warn("session is closed, skip resign", nil)
return
default:
ctxWithTimeout, cancel := context.WithTimeout(context.Background(), 5*time.Second)
defer cancel()
err := e.Resign(ctxWithTimeout)
if err != nil {
log.Error("failed to resign", map[string]interface{}{
log.FnError: err,
})
}
}
}()
if c.addon != nil {
if err := c.addon.Init(ctx, leaderKey); err != nil {
return fmt.Errorf("failed to init the addon: %w", err)
}
}
return c.runLoop(ctx, leaderKey)
}
func (c Controller) runLoop(ctx context.Context, leaderKey string) error {
err := c.checkLastOp(ctx, leaderKey)
if err != nil {
return err
}
watchChan := make(chan struct{})
var addonChan chan struct{}
env := well.NewEnvironment(ctx)
if c.addon != nil {
addonChan = make(chan struct{}, 1)
env.Go(func(ctx context.Context) error {
return c.addon.StartWatch(ctx, addonChan)
})
}
// Watch my leadership.
env.Go(func(ctx context.Context) error {
ch := c.session.Client().Watch(ctx, leaderKey, clientv3.WithFilterPut())
for {
select {
case <-ctx.Done():
return ctx.Err()
case <-c.session.Done():
return errors.New("session is closed")
case resp, ok := <-ch:
if !ok {
return errors.New("watch is closed")
}
if resp.Err() != nil {
return resp.Err()
}
for _, ev := range resp.Events {
if ev.Type == clientv3.EventTypeDelete {
return errors.New("leader key is deleted")
}
}
}
}
})
env.Go(func(ctx context.Context) error {
return startWatcher(ctx, c.session.Client(), watchChan)
})
env.Go(func(ctx context.Context) error {
select {
case <-watchChan:
case <-ctx.Done():
return ctx.Err()
}
ticker := time.NewTicker(c.config.Interval)
defer ticker.Stop()
for {
select {
case <-ctx.Done():
return nil
default:
}
err := c.runOnce(ctx, leaderKey, ticker.C, watchChan, addonChan)
if err != nil {
return err
}
}
})
env.Go(func(ctx context.Context) error {
select {
case <-ctx.Done():
return ctx.Err()
default:
}
ticker := time.NewTicker(c.config.CertsGCInterval)
defer ticker.Stop()
for {
select {
case <-ctx.Done():
return nil
case <-ticker.C:
}
err := c.runTidyExpiredCertificates(ctx)
if err != nil {
return err
}
}
})
env.Stop()
return env.Wait()
}
func (c Controller) checkLastOp(ctx context.Context, leaderKey string) error {
storage := cke.Storage{
Client: c.session.Client(),
}
records, err := storage.GetRecords(ctx, 1)
if err != nil {
return err
}
if len(records) == 0 {
return nil
}
r := records[0]
if r.Status == cke.StatusCancelled || r.Status == cke.StatusCompleted {
return nil
}
log.Warn("cancel the orphaned operation", map[string]interface{}{
"id": r.ID,
"op": r.Operation,
})
r.Cancel()
return storage.UpdateRecord(ctx, leaderKey, r)
}
func (c Controller) runOnce(ctx context.Context, leaderKey string, tick <-chan time.Time, watchChan, addonChan <-chan struct{}) error {
wait := false
defer func() {
if !wait {
return
}
select {
case <-watchChan:
case <-addonChan:
case <-ctx.Done():
case <-tick:
}
}()
storage := cke.Storage{
Client: c.session.Client(),
}
ts := time.Now().UTC()
cluster, err := storage.GetCluster(ctx)
switch err {
case cke.ErrNotFound:
wait = true
if c.addon != nil {
return c.addon.Do(ctx, leaderKey, nil)
}
return nil
case nil:
default:
return err
}
err = cluster.Validate(false)
if err != nil {
log.Error("invalid cluster configuration", map[string]interface{}{
log.FnError: err,
})
wait = true
// lint:ignore nilerr Try again.
return nil
}
inf, err := cke.NewInfrastructure(ctx, cluster, storage)
if err != nil {
// When the vault token is revoked, the following error will be returned. In this case, CKE can not continue any operations.
// Error: "Error making API request.\n\nURL: GET <<URL>>\nCode: 403. Errors:\n\n* permission denied"
if strings.Contains(err.Error(), "403") {
log.Error("vault token was revoked", map[string]interface{}{
log.FnError: err,
})
return err
}
wait = true
log.Error("failed to initialize infrastructure", map[string]interface{}{
log.FnError: err,
})
// lint:ignore nilerr Try again.
return nil
}
defer inf.Close()
// prepare service account signing
_, err = storage.GetServiceAccountCert(ctx)
switch err {
case nil:
case cke.ErrNotFound:
crt, key, err := cke.KubernetesCA{}.IssueForServiceAccount(ctx, inf)
if err != nil {
return err
}
err = storage.PutServiceAccountData(ctx, leaderKey, crt, key)
if err != nil {
return err
}
default:
return err
}
status, err := c.GetClusterStatus(ctx, cluster, inf)
if err != nil {
wait = true
log.Warn("failed to get cluster status", map[string]interface{}{
log.FnError: err,
})
// lint:ignore nilerr Try again.
return nil
}
constraints, err := inf.Storage().GetConstraints(ctx)
if err != nil {
return err
}
rcs, err := inf.Storage().GetAllResources(ctx)
if err != nil {
return err
}
rqEntries, err := inf.Storage().GetRebootsEntries(ctx)
if err != nil {
return err
}
rqEntries = cke.DedupRebootQueueEntries(rqEntries)
if len(rqEntries) > 0 {
disabled, err := inf.Storage().IsRebootQueueDisabled(ctx)
if err != nil {
return err
}
if disabled {
rqEntries = nil
}
}
nf := NewNodeFilter(cluster, status)
apiServers := map[string]bool{}
for _, node := range nf.ControlPlane() {
apiServers[node.Address] = true
}
newlyDrained := op.ChooseDrainedNodes(cluster, apiServers, rqEntries)
drainCompleted, drainTimedout, _ := op.CheckDrainCompletion(ctx, inf, nf.HealthyAPIServer(), cluster, rqEntries)
rebootDequeued := op.CheckRebootDequeue(ctx, cluster, rqEntries)
ops, phase := DecideOps(cluster, status, constraints, rcs, DecideOpsRebootArgs{
RQEntries: rqEntries,
NewlyDrained: newlyDrained,
DrainCompleted: drainCompleted,
DrainTimedout: drainTimedout,
RebootDequeued: rebootDequeued,
}, c.config)
st := &cke.ServerStatus{
Phase: phase,
Timestamp: ts,
}
err = storage.SetStatus(ctx, c.session.Lease(), st)
if err != nil {
return err
}
metrics.UpdateOperationPhase(phase, ts)
if len(ops) == 0 {
wait = true
if c.addon != nil {
return c.addon.Do(ctx, leaderKey, status)
}
return nil
}
// Reflect sabakan machine status when CKE does not need to do
// anything except for rebooting nodes.
if c.addon != nil && phase == cke.PhaseRebootNodes {
if err := c.addon.Do(ctx, leaderKey, status); err != nil {
return err
}
}
for _, op := range ops {
err := runOp(ctx, op, leaderKey, storage, inf)
switch err {
case nil:
case errCommandFailure:
wait = true
return nil
default:
return err
}
}
return nil
}
func runOp(ctx context.Context, op cke.Operator, leaderKey string, storage cke.Storage, inf cke.Infrastructure) error {
// register operation record
id, err := storage.NextRecordID(ctx)
if err != nil {
return err
}
record := cke.NewRecord(id, op.Name(), op.Targets())
err = storage.RegisterRecord(ctx, leaderKey, record)
if err != nil {
return err
}
log.Info("begin new operation", map[string]interface{}{
"op": op.Name(),
})
for {
commander := op.NextCommand()
if commander == nil {
break
}
// check the context before proceed
select {
case <-ctx.Done():
record.Cancel()
err = storage.UpdateRecord(ctx, leaderKey, record)
if err != nil {
return err
}
log.Info("interrupt the operation due to cancellation", map[string]interface{}{
"op": op.Name(),
})
return nil
default:
}
log.Info("record targets", map[string]interface{}{
"op": op.Name(),
"targets": strings.Join(op.Targets(), " "),
})
record.SetCommand(commander.Command())
err = storage.UpdateRecord(ctx, leaderKey, record)
if err != nil {
return err
}
log.Info("execute a command", map[string]interface{}{
"op": op.Name(),
"command": commander.Command().String(),
})
err = commander.Run(ctx, inf, leaderKey)
if err == nil {
continue
}
log.Error("command failed", map[string]interface{}{
log.FnError: err,
"op": op.Name(),
"command": commander.Command().String(),
})
record.SetError(err)
err2 := storage.UpdateRecord(ctx, leaderKey, record)
if err2 != nil {
return err2
}
// return errCommandFailure instead of err as command failure need to be
// handled gracefully.
return errCommandFailure
}
if iop, ok := op.(cke.InfoOperator); ok {
record.SetInfo(iop.Info())
}
record.Complete()
err = storage.UpdateRecord(ctx, leaderKey, record)
if err != nil {
return err
}
log.Info("operation completed", map[string]interface{}{
"op": op.Name(),
})
return nil
}
func (c Controller) runTidyExpiredCertificates(ctx context.Context) error {
storage := cke.Storage{
Client: c.session.Client(),
}
cfg, err := storage.GetVaultConfig(ctx)
if err != nil {
log.Warn("failed to get vault config. skip tidy", map[string]interface{}{
log.FnError: err,
})
// lint:ignore nilerr Tidy is not mandatory.
return nil
}
client, _, err := cke.VaultClient(cfg)
if err != nil {
return err
}
for _, ca := range cke.CAKeys {
if err := c.TidyExpiredCertificates(ctx, client, cke.VaultPKIKey(ca)); err != nil {
log.Warn("failed to tidy expired certificates", map[string]interface{}{
log.FnError: err,
"ca": ca,
})
}
}
return nil
}