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package main
import (
"context"
"flag"
"fmt"
"io"
"log"
"os"
"sort"
"strings"
"gitlab.com/gitlab-org/gitaly/internal/praefect/config"
"gitlab.com/gitlab-org/gitaly/proto/go/gitalypb"
)
type datalossSubcommand struct {
output io.Writer
virtualStorage string
}
func newDatalossSubcommand() *datalossSubcommand {
return &datalossSubcommand{output: os.Stdout}
}
func (cmd *datalossSubcommand) FlagSet() *flag.FlagSet {
fs := flag.NewFlagSet("dataloss", flag.ContinueOnError)
fs.StringVar(&cmd.virtualStorage, "virtual-storage", "", "virtual storage to check for data loss")
return fs
}
func (cmd *datalossSubcommand) println(indent int, msg string, args ...interface{}) {
fmt.Fprint(cmd.output, strings.Repeat(" ", indent))
fmt.Fprintf(cmd.output, msg, args...)
fmt.Fprint(cmd.output, "\n")
}
func (cmd *datalossSubcommand) Exec(flags *flag.FlagSet, cfg config.Config) error {
if flags.NArg() > 0 {
return UnexpectedPositionalArgsError{Command: flags.Name()}
}
virtualStorages := []string{cmd.virtualStorage}
if cmd.virtualStorage == "" {
virtualStorages = make([]string, len(cfg.VirtualStorages))
for i := range cfg.VirtualStorages {
virtualStorages[i] = cfg.VirtualStorages[i].Name
}
}
sort.Strings(virtualStorages)
nodeAddr, err := getNodeAddress(cfg)
if err != nil {
return err
}
conn, err := subCmdDial(nodeAddr, cfg.Auth.Token)
if err != nil {
return fmt.Errorf("error dialing: %v", err)
}
defer func() {
if err := conn.Close(); err != nil {
log.Printf("error closing connection: %v", err)
}
}()
client := gitalypb.NewPraefectInfoServiceClient(conn)
for _, vs := range virtualStorages {
resp, err := client.DatalossCheck(context.Background(), &gitalypb.DatalossCheckRequest{
VirtualStorage: vs,
})
if err != nil {
return fmt.Errorf("error checking: %v", err)
}
mode := "write-enabled"
if resp.IsReadOnly {
mode = "read-only"
}
cmd.println(0, "Virtual storage: %s", vs)
cmd.println(1, "Current %s primary: %s", mode, resp.CurrentPrimary)
if resp.PreviousWritablePrimary == "" {
fmt.Fprintln(cmd.output, " No data loss as the virtual storage has not encountered a failover")
continue
}
cmd.println(1, "Previous write-enabled primary: %s", resp.PreviousWritablePrimary)
if len(resp.OutdatedNodes) == 0 {
cmd.println(2, "No data loss from failing over from %s", resp.PreviousWritablePrimary)
continue
}
cmd.println(2, "Nodes with data loss from failing over from %s:", resp.PreviousWritablePrimary)
for _, odn := range resp.OutdatedNodes {
cmd.println(3, "%s: %s", odn.RelativePath, strings.Join(odn.Nodes, ", "))
}
}
return nil
}
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