constellation/cli/internal/cmd/recover.go
Daniel Weiße c52086c5ff
cli: refactor flag parsing code (#2425)
Signed-off-by: Daniel Weiße <dw@edgeless.systems>
2023-10-16 15:05:29 +02:00

251 lines
7.4 KiB
Go

/*
Copyright (c) Edgeless Systems GmbH
SPDX-License-Identifier: AGPL-3.0-only
*/
package cmd
import (
"context"
"errors"
"fmt"
"io"
"net"
"sync"
"time"
"github.com/edgelesssys/constellation/v2/cli/internal/cloudcmd"
"github.com/edgelesssys/constellation/v2/cli/internal/state"
"github.com/edgelesssys/constellation/v2/disk-mapper/recoverproto"
"github.com/edgelesssys/constellation/v2/internal/api/attestationconfigapi"
"github.com/edgelesssys/constellation/v2/internal/atls"
"github.com/edgelesssys/constellation/v2/internal/cloud/cloudprovider"
"github.com/edgelesssys/constellation/v2/internal/config"
"github.com/edgelesssys/constellation/v2/internal/constants"
"github.com/edgelesssys/constellation/v2/internal/file"
"github.com/edgelesssys/constellation/v2/internal/grpc/dialer"
grpcRetry "github.com/edgelesssys/constellation/v2/internal/grpc/retry"
"github.com/edgelesssys/constellation/v2/internal/kms/uri"
"github.com/edgelesssys/constellation/v2/internal/retry"
"github.com/spf13/afero"
"github.com/spf13/cobra"
"github.com/spf13/pflag"
)
// NewRecoverCmd returns a new cobra.Command for the recover command.
func NewRecoverCmd() *cobra.Command {
cmd := &cobra.Command{
Use: "recover",
Short: "Recover a completely stopped Constellation cluster",
Long: "Recover a Constellation cluster by sending a recovery key to an instance in the boot stage.\n\n" +
"This is only required if instances restart without other instances available for bootstrapping.",
Args: cobra.ExactArgs(0),
RunE: runRecover,
}
cmd.Flags().StringP("endpoint", "e", "", "endpoint of the instance, passed as HOST[:PORT]")
return cmd
}
type recoverFlags struct {
rootFlags
endpoint string
}
func (f *recoverFlags) parse(flags *pflag.FlagSet) error {
if err := f.rootFlags.parse(flags); err != nil {
return err
}
endpoint, err := flags.GetString("endpoint")
if err != nil {
return fmt.Errorf("getting 'endpoint' flag: %w", err)
}
f.endpoint = endpoint
return nil
}
type recoverCmd struct {
log debugLog
configFetcher attestationconfigapi.Fetcher
flags recoverFlags
}
func runRecover(cmd *cobra.Command, _ []string) error {
log, err := newCLILogger(cmd)
if err != nil {
return fmt.Errorf("creating logger: %w", err)
}
defer log.Sync()
fileHandler := file.NewHandler(afero.NewOsFs())
newDialer := func(validator atls.Validator) *dialer.Dialer {
return dialer.New(nil, validator, &net.Dialer{})
}
r := &recoverCmd{log: log, configFetcher: attestationconfigapi.NewFetcher()}
if err := r.flags.parse(cmd.Flags()); err != nil {
return err
}
r.log.Debugf("Using flags: %+v", r.flags)
return r.recover(cmd, fileHandler, 5*time.Second, &recoverDoer{log: r.log}, newDialer)
}
func (r *recoverCmd) recover(
cmd *cobra.Command, fileHandler file.Handler, interval time.Duration,
doer recoverDoerInterface, newDialer func(validator atls.Validator) *dialer.Dialer,
) error {
var masterSecret uri.MasterSecret
r.log.Debugf("Loading master secret file from %s", r.flags.pathPrefixer.PrefixPrintablePath(constants.MasterSecretFilename))
if err := fileHandler.ReadJSON(constants.MasterSecretFilename, &masterSecret); err != nil {
return err
}
r.log.Debugf("Loading configuration file from %q", r.flags.pathPrefixer.PrefixPrintablePath(constants.ConfigFilename))
conf, err := config.New(fileHandler, constants.ConfigFilename, r.configFetcher, r.flags.force)
var configValidationErr *config.ValidationError
if errors.As(err, &configValidationErr) {
cmd.PrintErrln(configValidationErr.LongMessage())
}
if err != nil {
return err
}
provider := conf.GetProvider()
r.log.Debugf("Got provider %s", provider.String())
if provider == cloudprovider.Azure {
interval = 20 * time.Second // Azure LB takes a while to remove unhealthy instances
}
stateFile, err := state.ReadFromFile(fileHandler, constants.StateFilename)
if err != nil {
return fmt.Errorf("reading state file: %w", err)
}
endpoint, err := r.parseEndpoint(stateFile)
if err != nil {
return err
}
if stateFile.Infrastructure.Azure != nil {
conf.UpdateMAAURL(stateFile.Infrastructure.Azure.AttestationURL)
}
r.log.Debugf("Creating aTLS Validator for %s", conf.GetAttestationConfig().GetVariant())
validator, err := cloudcmd.NewValidator(cmd, conf.GetAttestationConfig(), r.log)
if err != nil {
return fmt.Errorf("creating new validator: %w", err)
}
r.log.Debugf("Created a new validator")
doer.setDialer(newDialer(validator), endpoint)
r.log.Debugf("Set dialer for endpoint %s", endpoint)
doer.setURIs(masterSecret.EncodeToURI(), uri.NoStoreURI)
r.log.Debugf("Set secrets")
if err := r.recoverCall(cmd.Context(), cmd.OutOrStdout(), interval, doer); err != nil {
if grpcRetry.ServiceIsUnavailable(err) {
return nil
}
return fmt.Errorf("recovering cluster: %w", err)
}
return nil
}
func (r *recoverCmd) recoverCall(ctx context.Context, out io.Writer, interval time.Duration, doer recoverDoerInterface) error {
var err error
ctr := 0
for {
once := sync.Once{}
retryOnceOnFailure := func(err error) bool {
var retry bool
// retry transient GCP LB errors
if grpcRetry.LoadbalancerIsNotReady(err) {
retry = true
} else {
// retry connection errors once
// this is necessary because Azure's LB takes a while to remove unhealthy instances
once.Do(func() {
retry = grpcRetry.ServiceIsUnavailable(err)
})
}
r.log.Debugf("Encountered error (retriable: %t): %s", retry, err)
return retry
}
retrier := retry.NewIntervalRetrier(doer, interval, retryOnceOnFailure)
r.log.Debugf("Created new interval retrier")
err = retrier.Do(ctx)
if err != nil {
break
}
fmt.Fprintln(out, "Pushed recovery key.")
ctr++
}
r.log.Debugf("Retry counter is %d", ctr)
if ctr > 0 {
fmt.Fprintf(out, "Recovered %d control-plane nodes.\n", ctr)
} else if grpcRetry.ServiceIsUnavailable(err) {
fmt.Fprintln(out, "No control-plane nodes in need of recovery found. Exiting.")
return nil
}
return err
}
func (r *recoverCmd) parseEndpoint(state *state.State) (string, error) {
endpoint := r.flags.endpoint
if endpoint == "" {
endpoint = state.Infrastructure.ClusterEndpoint
}
endpoint, err := addPortIfMissing(endpoint, constants.RecoveryPort)
if err != nil {
return "", fmt.Errorf("validating cluster endpoint: %w", err)
}
return endpoint, nil
}
type recoverDoerInterface interface {
Do(ctx context.Context) error
setDialer(dialer grpcDialer, endpoint string)
setURIs(kmsURI, storageURI string)
}
type recoverDoer struct {
dialer grpcDialer
endpoint string
kmsURI string // encodes masterSecret
storageURI string
log debugLog
}
// Do performs the recover streaming rpc.
func (d *recoverDoer) Do(ctx context.Context) (retErr error) {
conn, err := d.dialer.Dial(ctx, d.endpoint)
if err != nil {
return fmt.Errorf("dialing recovery server: %w", err)
}
d.log.Debugf("Dialed recovery server")
defer conn.Close()
protoClient := recoverproto.NewAPIClient(conn)
d.log.Debugf("Created protoClient")
req := &recoverproto.RecoverMessage{
KmsUri: d.kmsURI,
StorageUri: d.storageURI,
}
_, err = protoClient.Recover(ctx, req)
if err != nil {
return fmt.Errorf("calling recover: %w", err)
}
d.log.Debugf("Received confirmation")
return nil
}
func (d *recoverDoer) setDialer(dialer grpcDialer, endpoint string) {
d.dialer = dialer
d.endpoint = endpoint
}
func (d *recoverDoer) setURIs(kmsURI, storageURI string) {
d.kmsURI = kmsURI
d.storageURI = storageURI
}