140 lines
3.1 KiB
Go
140 lines
3.1 KiB
Go
package main
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import (
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"context"
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"flag"
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"fmt"
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"log"
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"os"
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"text/tabwriter"
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"time"
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"github.com/benbjohnson/litestream"
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)
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// SnapshotsCommand represents a command to list snapshots for a command.
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type SnapshotsCommand struct{}
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// Run executes the command.
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func (c *SnapshotsCommand) Run(ctx context.Context, args []string) (err error) {
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fs := flag.NewFlagSet("litestream-snapshots", flag.ContinueOnError)
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configPath, noExpandEnv := registerConfigFlag(fs)
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replicaName := fs.String("replica", "", "replica name")
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fs.Usage = c.Usage
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if err := fs.Parse(args); err != nil {
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return err
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} else if fs.NArg() == 0 || fs.Arg(0) == "" {
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return fmt.Errorf("database path required")
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} else if fs.NArg() > 1 {
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return fmt.Errorf("too many arguments")
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}
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var db *litestream.DB
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var r *litestream.Replica
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if isURL(fs.Arg(0)) {
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if *configPath != "" {
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return fmt.Errorf("cannot specify a replica URL and the -config flag")
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}
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if r, err = NewReplicaFromConfig(&ReplicaConfig{URL: fs.Arg(0)}, nil); err != nil {
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return err
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}
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} else {
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if *configPath == "" {
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*configPath = DefaultConfigPath()
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}
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// Load configuration.
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config, err := ReadConfigFile(*configPath, !*noExpandEnv)
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if err != nil {
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return err
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}
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// Lookup database from configuration file by path.
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if path, err := expand(fs.Arg(0)); err != nil {
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return err
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} else if dbc := config.DBConfig(path); dbc == nil {
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return fmt.Errorf("database not found in config: %s", path)
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} else if db, err = NewDBFromConfig(dbc); err != nil {
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return err
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}
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// Filter by replica, if specified.
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if *replicaName != "" {
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if r = db.Replica(*replicaName); r == nil {
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return fmt.Errorf("replica %q not found for database %q", *replicaName, db.Path())
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}
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}
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}
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// Find snapshots by db or replica.
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var replicas []*litestream.Replica
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if r != nil {
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replicas = []*litestream.Replica{r}
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} else {
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replicas = db.Replicas
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}
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// List all snapshots.
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w := tabwriter.NewWriter(os.Stdout, 0, 8, 2, ' ', 0)
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defer w.Flush()
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fmt.Fprintln(w, "replica\tgeneration\tindex\tsize\tcreated")
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for _, r := range replicas {
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infos, err := r.Snapshots(ctx)
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if err != nil {
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log.Printf("cannot determine snapshots: %s", err)
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continue
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}
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for _, info := range infos {
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fmt.Fprintf(w, "%s\t%s\t%d\t%d\t%s\n",
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r.Name(),
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info.Generation,
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info.Index,
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info.Size,
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info.CreatedAt.Format(time.RFC3339),
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)
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}
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}
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return nil
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}
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// Usage prints the help screen to STDOUT.
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func (c *SnapshotsCommand) Usage() {
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fmt.Printf(`
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The snapshots command lists all snapshots available for a database or replica.
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Usage:
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litestream snapshots [arguments] DB_PATH
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litestream snapshots [arguments] REPLICA_URL
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Arguments:
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-config PATH
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Specifies the configuration file.
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Defaults to %s
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-no-expand-env
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Disables environment variable expansion in configuration file.
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-replica NAME
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Optional, filter by a specific replica.
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Examples:
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# List all snapshots for a database.
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$ litestream snapshots /path/to/db
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# List all snapshots on S3.
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$ litestream snapshots -replica s3 /path/to/db
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# List all snapshots by replica URL.
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$ litestream snapshots s3://mybkt/db
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`[1:],
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DefaultConfigPath(),
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)
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}
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