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package main
import (
"bytes"
"context"
"errors"
"flag"
"fmt"
"io"
"log"
"gitlab.com/gitlab-org/gitaly/internal/praefect/config"
"gitlab.com/gitlab-org/gitaly/proto/go/gitalypb"
)
type nodeReconciler struct {
conf config.Config
virtualStorage string
targetStorage string
referenceStorage string
disableReconciliation bool
}
type reconcileSubcommand struct {
virtual string
target string
reference string
force bool
}
func (s *reconcileSubcommand) FlagSet() *flag.FlagSet {
fs := flag.NewFlagSet("reconcile", flag.ExitOnError)
fs.StringVar(&s.virtual, "virtual", "", "virtual storage for target storage")
fs.StringVar(&s.target, "target", "", "target storage to reconcile")
fs.StringVar(&s.reference, "reference", "", "reference storage to reconcile (optional)")
fs.BoolVar(&s.force, "f", false, "actually schedule replications")
return fs
}
func (s *reconcileSubcommand) Exec(flags *flag.FlagSet, conf config.Config) error {
logger.Warn("The reconcile sub-command has been deprecated in GitLab 13.12 and is scheduled for removal in GitLab 14.0. Use the automatic reconciler instead: https://docs.gitlab.com/ee/administration/gitaly/praefect.html#automatic-reconciliation")
nr := nodeReconciler{
conf: conf,
virtualStorage: s.virtual,
targetStorage: s.target,
referenceStorage: s.reference,
disableReconciliation: !s.force,
}
if err := nr.reconcile(); err != nil {
return fmt.Errorf("unable to reconcile: %s", err)
}
return nil
}
func getNodeAddress(cfg config.Config) (string, error) {
switch {
case cfg.SocketPath != "":
return "unix://" + cfg.SocketPath, nil
case cfg.ListenAddr != "":
return "tcp://" + cfg.ListenAddr, nil
default:
return "", errors.New("no Praefect address configured")
}
}
func (nr nodeReconciler) reconcile() error {
if err := nr.validateArgs(); err != nil {
return err
}
nodeAddr, err := getNodeAddress(nr.conf)
if err != nil {
return err
}
cc, err := subCmdDial(nodeAddr, nr.conf.Auth.Token)
if err != nil {
return err
}
pCli := gitalypb.NewPraefectInfoServiceClient(cc)
if nr.disableReconciliation {
log.Print("Performing a DRY RUN - no changes will be made until '-f' flag is provided")
} else {
log.Print("Performing a LIVE RUN - any repositories on target that are inconsistent with reference will be overwritten with the version present on reference")
}
request := &gitalypb.ConsistencyCheckRequest{
VirtualStorage: nr.virtualStorage,
TargetStorage: nr.targetStorage,
ReferenceStorage: nr.referenceStorage,
DisableReconcilliation: nr.disableReconciliation,
}
stream, err := pCli.ConsistencyCheck(context.TODO(), request)
if err != nil {
return err
}
log.Print("Checking consistency...")
if err := nr.consumeStream(stream); err != nil {
return err
}
return nil
}
func (nr nodeReconciler) validateArgs() error {
var vsFound, tFound, rFound bool
for _, vs := range nr.conf.VirtualStorages {
if vs.Name != nr.virtualStorage {
continue
}
vsFound = true
for _, n := range vs.Nodes {
if n.Storage == nr.targetStorage {
tFound = true
}
if n.Storage == nr.referenceStorage {
rFound = true
}
}
}
if !vsFound {
return fmt.Errorf(
"cannot find virtual storage %s in config", nr.virtualStorage,
)
}
if !tFound {
return fmt.Errorf(
"cannot find target storage %s in virtual storage %q in config",
nr.targetStorage, nr.virtualStorage,
)
}
if nr.referenceStorage != "" && !rFound {
return fmt.Errorf(
"cannot find reference storage %q in virtual storage %q in config",
nr.referenceStorage, nr.virtualStorage,
)
}
return nil
}
func (nr nodeReconciler) consumeStream(stream gitalypb.PraefectInfoService_ConsistencyCheckClient) error {
var rStorage string
var i uint
for ; ; i++ {
resp, err := stream.Recv()
if err == io.EOF {
break
}
if err != nil {
return err
}
if resp.ReferenceStorage != rStorage {
rStorage = resp.ReferenceStorage
log.Print("Reference storage being used: " + rStorage)
}
if len(resp.Errors) > 0 {
var composedErrMsg bytes.Buffer
for _, errMsg := range resp.Errors {
composedErrMsg.WriteString("\t")
composedErrMsg.WriteString(errMsg)
composedErrMsg.WriteString("\n")
}
log.Printf("FAILURE: Internal error(s) occurred for the repo %s: %s", resp.GetRepoRelativePath(), composedErrMsg.String())
continue
}
if resp.GetReferenceChecksum() == resp.GetTargetChecksum() {
log.Print("CONSISTENT: " + resp.GetRepoRelativePath())
continue
}
checksumPrint := func(checksum string) string {
if checksum == "" {
return "null"
}
return checksum
}
log.Printf(
"INCONSISTENT: Repo %s has checksum %s on target but checksum %s on reference storage %s",
resp.GetRepoRelativePath(),
checksumPrint(resp.GetTargetChecksum()),
checksumPrint(resp.GetReferenceChecksum()),
resp.GetReferenceStorage(),
)
if resp.GetReplJobId() != 0 {
log.Printf(
"SCHEDULED: Replication job %d will update repo %s",
resp.GetReplJobId(),
resp.GetRepoRelativePath(),
)
}
}
log.Printf("FINISHED: %d repos were checked for consistency", i)
return nil
}
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