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// Copyright 2016 The etcd Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package command
import (
"context"
"fmt"
"os"
"github.com/spf13/cobra"
"go.etcd.io/etcd/client/pkg/v3/logutil"
snapshot "go.etcd.io/etcd/client/v3/snapshot"
"go.etcd.io/etcd/etcdutl/v3/etcdutl"
"go.etcd.io/etcd/pkg/v3/cobrautl"
"go.uber.org/zap"
)
const (
defaultName = "default"
defaultInitialAdvertisePeerURLs = "http://localhost:2380"
)
var (
restoreCluster string
restoreClusterToken string
restoreDataDir string
restoreWalDir string
restorePeerURLs string
restoreName string
skipHashCheck bool
markCompacted bool
revisionBump uint64
initialMmapSize uint64
)
// NewSnapshotCommand returns the cobra command for "snapshot".
func NewSnapshotCommand() *cobra.Command {
cmd := &cobra.Command{
Use: "snapshot <subcommand>",
Short: "Manages etcd node snapshots",
}
cmd.AddCommand(NewSnapshotSaveCommand())
cmd.AddCommand(NewSnapshotRestoreCommand())
cmd.AddCommand(newSnapshotStatusCommand())
return cmd
}
func NewSnapshotSaveCommand() *cobra.Command {
return &cobra.Command{
Use: "save <filename>",
Short: "Stores an etcd node backend snapshot to a given file",
Run: snapshotSaveCommandFunc,
}
}
func newSnapshotStatusCommand() *cobra.Command {
return &cobra.Command{
Use: "status <filename>",
Short: "[deprecated] Gets backend snapshot status of a given file",
Long: `When --write-out is set to simple, this command prints out comma-separated status lists for each endpoint.
The items in the lists are hash, revision, total keys, total size.
Moved to 'etcdctl snapshot status ...'
`,
Run: snapshotStatusCommandFunc,
}
}
func NewSnapshotRestoreCommand() *cobra.Command {
cmd := &cobra.Command{
Use: "restore <filename> [options]",
Short: "Restores an etcd member snapshot to an etcd directory",
Run: snapshotRestoreCommandFunc,
Long: "Moved to `etcdctl snapshot restore ...`\n",
}
cmd.Flags().StringVar(&restoreDataDir, "data-dir", "", "Path to the data directory")
cmd.Flags().StringVar(&restoreWalDir, "wal-dir", "", "Path to the WAL directory (use --data-dir if none given)")
cmd.Flags().StringVar(&restoreCluster, "initial-cluster", initialClusterFromName(defaultName), "Initial cluster configuration for restore bootstrap")
cmd.Flags().StringVar(&restoreClusterToken, "initial-cluster-token", "etcd-cluster", "Initial cluster token for the etcd cluster during restore bootstrap")
cmd.Flags().StringVar(&restorePeerURLs, "initial-advertise-peer-urls", defaultInitialAdvertisePeerURLs, "List of this member's peer URLs to advertise to the rest of the cluster")
cmd.Flags().StringVar(&restoreName, "name", defaultName, "Human-readable name for this member")
cmd.Flags().BoolVar(&skipHashCheck, "skip-hash-check", false, "Ignore snapshot integrity hash value (required if copied from data directory)")
cmd.Flags().Uint64Var(&revisionBump, "bump-revision", 0, "How much to increase the latest revision after restore")
cmd.Flags().BoolVar(&markCompacted, "mark-compacted", false, "Mark the latest revision after restore as the point of scheduled compaction (required if --bump-revision > 0, disallowed otherwise)")
cmd.Flags().Uint64Var(&initialMmapSize, "initial-memory-map-size", initialMmapSize, "Initial memory map size of the database in bytes. It uses the default value if not defined or defined to 0")
return cmd
}
func snapshotSaveCommandFunc(cmd *cobra.Command, args []string) {
if len(args) != 1 {
err := fmt.Errorf("snapshot save expects one argument")
cobrautl.ExitWithError(cobrautl.ExitBadArgs, err)
}
lg, err := logutil.CreateDefaultZapLogger(zap.InfoLevel)
if err != nil {
cobrautl.ExitWithError(cobrautl.ExitError, err)
}
cfg := mustClientCfgFromCmd(cmd)
// if user does not specify "--command-timeout" flag, there will be no timeout for snapshot save command
ctx, cancel := context.WithCancel(context.Background())
if isCommandTimeoutFlagSet(cmd) {
ctx, cancel = commandCtx(cmd)
}
defer cancel()
path := args[0]
if err := snapshot.Save(ctx, lg, *cfg, path); err != nil {
cobrautl.ExitWithError(cobrautl.ExitInterrupted, err)
}
fmt.Printf("Snapshot saved at %s\n", path)
}
func snapshotStatusCommandFunc(cmd *cobra.Command, args []string) {
fmt.Fprintf(os.Stderr, "Deprecated: Use `etcdutl snapshot status` instead.\n\n")
etcdutl.SnapshotStatusCommandFunc(cmd, args)
}
func snapshotRestoreCommandFunc(cmd *cobra.Command, args []string) {
fmt.Fprintf(os.Stderr, "Deprecated: Use `etcdutl snapshot restore` instead.\n\n")
etcdutl.SnapshotRestoreCommandFunc(restoreCluster, restoreClusterToken, restoreDataDir, restoreWalDir,
restorePeerURLs, restoreName, skipHashCheck, initialMmapSize, revisionBump, markCompacted, args)
}
func initialClusterFromName(name string) string {
n := name
if name == "" {
n = defaultName
}
return fmt.Sprintf("%s=http://localhost:2380", n)
}
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