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restore.go
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restore.go
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package restore
import (
"bytes"
"errors"
"flag"
"fmt"
"io"
"net"
"os"
"path/filepath"
"github.com/BurntSushi/toml"
"github.com/influxdb/influxdb/meta"
"github.com/influxdb/influxdb/snapshot"
"github.com/influxdb/influxdb/tsdb"
)
// Command represents the program execution for "influxd restore".
type Command struct {
Stdout io.Writer
Stderr io.Writer
}
// NewCommand returns a new instance of Command with default settings.
func NewCommand() *Command {
return &Command{
Stdout: os.Stdout,
Stderr: os.Stderr,
}
}
// Run executes the program.
func (cmd *Command) Run(args ...string) error {
config, path, err := cmd.parseFlags(args)
if err != nil {
return err
}
return cmd.Restore(config, path)
}
func (cmd *Command) Restore(config *Config, path string) error {
// Remove meta and data directories.
if err := os.RemoveAll(config.Meta.Dir); err != nil {
return fmt.Errorf("remove meta dir: %s", err)
} else if err := os.RemoveAll(config.Data.Dir); err != nil {
return fmt.Errorf("remove data dir: %s", err)
}
// Open snapshot file and all incremental backups.
mr, files, err := snapshot.OpenFileMultiReader(path)
if err != nil {
return fmt.Errorf("open multireader: %s", err)
}
defer closeAll(files)
// Unpack files from archive.
if err := cmd.unpack(mr, config); err != nil {
return fmt.Errorf("unpack: %s", err)
}
// Notify user of completion.
fmt.Fprintf(os.Stdout, "restore complete using %s", path)
return nil
}
// parseFlags parses and validates the command line arguments.
func (cmd *Command) parseFlags(args []string) (*Config, string, error) {
fs := flag.NewFlagSet("", flag.ContinueOnError)
configPath := fs.String("config", "", "")
fs.SetOutput(cmd.Stderr)
fs.Usage = cmd.printUsage
if err := fs.Parse(args); err != nil {
return nil, "", err
}
// Parse configuration file from disk.
if *configPath == "" {
return nil, "", fmt.Errorf("config required")
}
// Parse config.
config := Config{
Meta: meta.NewConfig(),
Data: tsdb.NewConfig(),
}
if _, err := toml.DecodeFile(*configPath, &config); err != nil {
return nil, "", err
}
// Require output path.
path := fs.Arg(0)
if path == "" {
return nil, "", fmt.Errorf("snapshot path required")
}
return &config, path, nil
}
func closeAll(a []io.Closer) {
for _, c := range a {
_ = c.Close()
}
}
// unpack expands the files in the snapshot archive into a directory.
func (cmd *Command) unpack(mr *snapshot.MultiReader, config *Config) error {
// Loop over files and extract.
for {
// Read entry header.
sf, err := mr.Next()
if err == io.EOF {
break
} else if err != nil {
return fmt.Errorf("next: entry=%s, err=%s", sf.Name, err)
}
// Log progress.
fmt.Fprintf(os.Stdout, "unpacking: %s (%d bytes)\n", sf.Name, sf.Size)
// Handle meta and tsdb files separately.
switch sf.Name {
case "meta":
if err := cmd.unpackMeta(mr, sf, config); err != nil {
return fmt.Errorf("meta: %s", err)
}
default:
if err := cmd.unpackData(mr, sf, config); err != nil {
return fmt.Errorf("data: %s", err)
}
}
}
return nil
}
// unpackMeta reads the metadata from the snapshot and initializes a raft
// cluster and replaces the root metadata.
func (cmd *Command) unpackMeta(mr *snapshot.MultiReader, sf snapshot.File, config *Config) error {
// Read meta into buffer.
var buf bytes.Buffer
if _, err := io.CopyN(&buf, mr, sf.Size); err != nil {
return fmt.Errorf("copy: %s", err)
}
// Unpack into metadata.
var data meta.Data
if err := data.UnmarshalBinary(buf.Bytes()); err != nil {
return fmt.Errorf("unmarshal: %s", err)
}
// Copy meta config and remove peers so it starts in single mode.
c := config.Meta
c.Peers = nil
// Initialize meta store.
store := meta.NewStore(config.Meta)
store.RaftListener = newNopListener()
store.ExecListener = newNopListener()
// Determine advertised address.
_, port, err := net.SplitHostPort(config.Meta.BindAddress)
if err != nil {
return fmt.Errorf("split bind address: %s", err)
}
hostport := net.JoinHostPort(config.Meta.Hostname, port)
// Resolve address.
addr, err := net.ResolveTCPAddr("tcp", hostport)
if err != nil {
return fmt.Errorf("resolve tcp: addr=%s, err=%s", hostport, err)
}
store.Addr = addr
// Open the meta store.
if err := store.Open(); err != nil {
return fmt.Errorf("open store: %s", err)
}
defer store.Close()
// Wait for the store to be ready or error.
select {
case <-store.Ready():
case err := <-store.Err():
return err
}
// Force set the full metadata.
if err := store.SetData(&data); err != nil {
return fmt.Errorf("set data: %s", err)
}
return nil
}
func (cmd *Command) unpackData(mr *snapshot.MultiReader, sf snapshot.File, config *Config) error {
path := filepath.Join(config.Data.Dir, sf.Name)
// Create parent directory for output file.
if err := os.MkdirAll(filepath.Dir(path), 0777); err != nil {
return fmt.Errorf("mkdir: entry=%s, err=%s", sf.Name, err)
}
// Create output file.
f, err := os.Create(path)
if err != nil {
return fmt.Errorf("create: entry=%s, err=%s", sf.Name, err)
}
defer f.Close()
// Copy contents from reader.
if _, err := io.CopyN(f, mr, sf.Size); err != nil {
return fmt.Errorf("copy: entry=%s, err=%s", sf.Name, err)
}
return nil
}
// printUsage prints the usage message to STDERR.
func (cmd *Command) printUsage() {
fmt.Fprintf(cmd.Stderr, `usage: influxd restore [flags] PATH
restore uses a snapshot of a data node to rebuild a cluster.
-config <path>
Set the path to the configuration file.
`)
}
// Config represents a partial config for rebuilding the server.
type Config struct {
Meta *meta.Config `toml:"meta"`
Data tsdb.Config `toml:"data"`
}
type nopListener struct {
closing chan struct{}
}
func newNopListener() *nopListener {
return &nopListener{make(chan struct{})}
}
func (ln *nopListener) Accept() (net.Conn, error) {
<-ln.closing
return nil, errors.New("listener closing")
}
func (ln *nopListener) Close() error { close(ln.closing); return nil }
func (ln *nopListener) Addr() net.Addr { return nil }