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export.go
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export.go
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package export
import (
"compress/gzip"
"flag"
"fmt"
"io"
"log"
"math"
"os"
"path"
"path/filepath"
"sort"
"strings"
"sync"
"time"
"github.com/influxdata/influxdb/influxql"
"github.com/influxdata/influxdb/models"
"github.com/influxdata/influxdb/pkg/escape"
"github.com/influxdata/influxdb/tsdb/engine/tsm1"
)
// Command represents the program execution for "influx_inspect export".
type Command struct {
// Standard input/output, overridden for testing.
Stderr io.Writer
Stdout io.Writer
dataDir string
walDir string
out string
database string
retentionPolicy string
startTime int64
endTime int64
compress bool
manifest map[string]struct{}
tsmFiles map[string][]string
walFiles map[string][]string
}
// NewCommand returns a new instance of Command.
func NewCommand() *Command {
return &Command{
Stderr: os.Stderr,
Stdout: os.Stdout,
manifest: make(map[string]struct{}),
tsmFiles: make(map[string][]string),
walFiles: make(map[string][]string),
}
}
// Run executes the command.
func (cmd *Command) Run(args ...string) error {
var start, end string
fs := flag.NewFlagSet("export", flag.ExitOnError)
fs.StringVar(&cmd.dataDir, "datadir", os.Getenv("HOME")+"/.influxdb/data", "Data storage path")
fs.StringVar(&cmd.walDir, "waldir", os.Getenv("HOME")+"/.influxdb/wal", "WAL storage path")
fs.StringVar(&cmd.out, "out", os.Getenv("HOME")+"/.influxdb/export", "Destination file to export to")
fs.StringVar(&cmd.database, "database", "", "Optional: the database to export")
fs.StringVar(&cmd.retentionPolicy, "retention", "", "Optional: the retention policy to export (requires -database)")
fs.StringVar(&start, "start", "", "Optional: the start time to export")
fs.StringVar(&end, "end", "", "Optional: the end time to export")
fs.BoolVar(&cmd.compress, "compress", false, "Compress the output")
fs.SetOutput(cmd.Stdout)
fs.Usage = func() {
fmt.Fprintf(cmd.Stdout, "Exports TSM files into InfluxDB line protocol format.\n\n")
fmt.Fprintf(cmd.Stdout, "Usage: %s export [flags]\n\n", filepath.Base(os.Args[0]))
fs.PrintDefaults()
}
if err := fs.Parse(args); err != nil {
return err
}
// set defaults
if start != "" {
s, err := time.Parse(time.RFC3339, start)
if err != nil {
return err
}
cmd.startTime = s.UnixNano()
} else {
cmd.startTime = math.MinInt64
}
if end != "" {
e, err := time.Parse(time.RFC3339, end)
if err != nil {
return err
}
cmd.endTime = e.UnixNano()
} else {
// set end time to max if it is not set.
cmd.endTime = math.MaxInt64
}
if err := cmd.validate(); err != nil {
return err
}
return cmd.export()
}
func (cmd *Command) validate() error {
// validate args
if cmd.retentionPolicy != "" && cmd.database == "" {
return fmt.Errorf("must specify a db")
}
if cmd.startTime != 0 && cmd.endTime != 0 && cmd.endTime < cmd.startTime {
return fmt.Errorf("end time before start time")
}
return nil
}
func (cmd *Command) export() error {
if err := cmd.walkTSMFiles(); err != nil {
return err
}
if err := cmd.walkWALFiles(); err != nil {
return err
}
return cmd.writeFiles()
}
func (cmd *Command) walkTSMFiles() error {
err := filepath.Walk(cmd.dataDir, func(dir string, f os.FileInfo, err error) error {
if err != nil {
return err
}
// check to see if this is a tsm file
ext := fmt.Sprintf(".%s", tsm1.TSMFileExtension)
if filepath.Ext(dir) != ext {
return nil
}
relPath, _ := filepath.Rel(cmd.dataDir, dir)
dirs := strings.Split(relPath, string(byte(os.PathSeparator)))
if len(dirs) < 2 {
return fmt.Errorf("invalid directory structure for %s", dir)
}
if dirs[0] == cmd.database || cmd.database == "" {
if dirs[1] == cmd.retentionPolicy || cmd.retentionPolicy == "" {
key := filepath.Join(dirs[0], dirs[1])
files := cmd.tsmFiles[key]
if files == nil {
files = []string{}
}
cmd.manifest[key] = struct{}{}
cmd.tsmFiles[key] = append(files, dir)
}
}
return nil
})
if err != nil {
return err
}
return nil
}
func (cmd *Command) walkWALFiles() error {
err := filepath.Walk(cmd.walDir, func(dir string, f os.FileInfo, err error) error {
if err != nil {
return err
}
// check to see if this is a wal file
prefix := tsm1.WALFilePrefix
ext := fmt.Sprintf(".%s", tsm1.WALFileExtension)
_, fileName := path.Split(dir)
if filepath.Ext(dir) != ext || !strings.HasPrefix(fileName, prefix) {
return nil
}
relPath, _ := filepath.Rel(cmd.walDir, dir)
dirs := strings.Split(relPath, string(byte(os.PathSeparator)))
if len(dirs) < 2 {
return fmt.Errorf("invalid directory structure for %s", dir)
}
if dirs[0] == cmd.database || cmd.database == "" {
if dirs[1] == cmd.retentionPolicy || cmd.retentionPolicy == "" {
key := filepath.Join(dirs[0], dirs[1])
files := cmd.walFiles[key]
if files == nil {
files = []string{}
}
cmd.manifest[key] = struct{}{}
cmd.walFiles[key] = append(files, dir)
}
}
return nil
})
if err != nil {
return err
}
return nil
}
func (cmd *Command) writeFiles() error {
// open our output file and create an output buffer
var w io.WriteCloser
w, err := os.Create(cmd.out)
if err != nil {
return err
}
defer w.Close()
if cmd.compress {
w = gzip.NewWriter(w)
defer w.Close()
}
s, e := time.Unix(0, cmd.startTime).Format(time.RFC3339), time.Unix(0, cmd.endTime).Format(time.RFC3339)
fmt.Fprintf(w, "# INFLUXDB EXPORT: %s - %s\n", s, e)
// Write out all the DDL
fmt.Fprintln(w, "# DDL")
for key := range cmd.manifest {
keys := strings.Split(key, string(byte(os.PathSeparator)))
db, rp := influxql.QuoteIdent(keys[0]), influxql.QuoteIdent(keys[1])
fmt.Fprintf(w, "CREATE DATABASE %s WITH NAME %s\n", db, rp)
}
fmt.Fprintln(w, "# DML")
for key := range cmd.manifest {
keys := strings.Split(key, string(byte(os.PathSeparator)))
fmt.Fprintf(w, "# CONTEXT-DATABASE:%s\n", keys[0])
fmt.Fprintf(w, "# CONTEXT-RETENTION-POLICY:%s\n", keys[1])
if files, ok := cmd.tsmFiles[key]; ok {
fmt.Printf("writing out tsm file data for %s...", key)
if err := cmd.writeTsmFiles(w, files); err != nil {
return err
}
fmt.Println("complete.")
}
if _, ok := cmd.walFiles[key]; ok {
fmt.Printf("writing out wal file data for %s...", key)
if err := cmd.writeWALFiles(w, cmd.walFiles[key], key); err != nil {
return err
}
fmt.Println("complete.")
}
}
return nil
}
func (cmd *Command) writeTsmFiles(w io.WriteCloser, files []string) error {
fmt.Fprintln(w, "# writing tsm data")
// we need to make sure we write the same order that the files were written
sort.Strings(files)
// use a function here to close the files in the defers and not let them accumulate in the loop
write := func(f string) error {
file, err := os.OpenFile(f, os.O_RDONLY, 0600)
if err != nil {
return fmt.Errorf("%v", err)
}
defer file.Close()
reader, err := tsm1.NewTSMReader(file)
if err != nil {
log.Printf("unable to read %s, skipping\n", f)
return nil
}
defer reader.Close()
if sgStart, sgEnd := reader.TimeRange(); sgStart > cmd.endTime || sgEnd < cmd.startTime {
return nil
}
for i := 0; i < reader.KeyCount(); i++ {
var pairs string
key, typ := reader.KeyAt(i)
values, _ := reader.ReadAll(string(key))
measurement, field := tsm1.SeriesAndFieldFromCompositeKey(key)
// measurements are stored escaped, field names are not
field = escape.String(field)
for _, value := range values {
if (value.UnixNano() < cmd.startTime) || (value.UnixNano() > cmd.endTime) {
continue
}
switch typ {
case tsm1.BlockFloat64:
pairs = field + "=" + fmt.Sprintf("%v", value.Value())
case tsm1.BlockInteger:
pairs = field + "=" + fmt.Sprintf("%vi", value.Value())
case tsm1.BlockBoolean:
pairs = field + "=" + fmt.Sprintf("%v", value.Value())
case tsm1.BlockString:
pairs = field + "=" + fmt.Sprintf("%q", models.EscapeStringField(fmt.Sprintf("%s", value.Value())))
default:
pairs = field + "=" + fmt.Sprintf("%v", value.Value())
}
fmt.Fprintln(w, string(measurement), pairs, value.UnixNano())
}
}
return nil
}
for _, f := range files {
if err := write(f); err != nil {
return err
}
}
return nil
}
func (cmd *Command) writeWALFiles(w io.WriteCloser, files []string, key string) error {
fmt.Fprintln(w, "# writing wal data")
// we need to make sure we write the same order that the wal received the data
sort.Strings(files)
var once sync.Once
warn := func() {
msg := fmt.Sprintf(`WARNING: detected deletes in wal file.
Some series for %q may be brought back by replaying this data.
To resolve, you can either let the shard snapshot prior to exporting the data
or manually editing the exported file.
`, key)
fmt.Fprintln(cmd.Stderr, msg)
}
// use a function here to close the files in the defers and not let them accumulate in the loop
write := func(f string) error {
file, err := os.OpenFile(f, os.O_RDONLY, 0600)
if err != nil {
return fmt.Errorf("%v", err)
}
defer file.Close()
reader := tsm1.NewWALSegmentReader(file)
defer reader.Close()
for reader.Next() {
entry, err := reader.Read()
if err != nil {
n := reader.Count()
fmt.Fprintf(os.Stderr, "file %s corrupt at position %d", file.Name(), n)
break
}
switch t := entry.(type) {
case *tsm1.DeleteWALEntry:
once.Do(warn)
continue
case *tsm1.DeleteRangeWALEntry:
once.Do(warn)
continue
case *tsm1.WriteWALEntry:
var pairs string
for key, values := range t.Values {
measurement, field := tsm1.SeriesAndFieldFromCompositeKey([]byte(key))
// measurements are stored escaped, field names are not
field = escape.String(field)
for _, value := range values {
if (value.UnixNano() < cmd.startTime) || (value.UnixNano() > cmd.endTime) {
continue
}
switch value.Value().(type) {
case float64:
pairs = field + "=" + fmt.Sprintf("%v", value.Value())
case int64:
pairs = field + "=" + fmt.Sprintf("%vi", value.Value())
case bool:
pairs = field + "=" + fmt.Sprintf("%v", value.Value())
case string:
pairs = field + "=" + fmt.Sprintf("%q", models.EscapeStringField(fmt.Sprintf("%s", value.Value())))
default:
pairs = field + "=" + fmt.Sprintf("%v", value.Value())
}
fmt.Fprintln(w, string(measurement), pairs, value.UnixNano())
}
}
}
}
return nil
}
for _, f := range files {
if err := write(f); err != nil {
return err
}
}
return nil
}