forked from influxdata/influxdb
/
export.go
163 lines (147 loc) · 3.93 KB
/
export.go
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package main
import (
"compress/gzip"
"fmt"
"io"
"log"
"os"
"path/filepath"
"strings"
"github.com/influxdata/influxdb/models"
"github.com/influxdata/influxdb/tsdb/engine/tsm1"
)
type cmdExport struct {
path string
out string
db string
retentionPolicy string
compress bool
ext string
files map[string][]string
}
func newCmdExport(path, out, db, retentionPolicy string, compress bool) *cmdExport {
return &cmdExport{
path: filepath.Join(path, "data"),
out: out,
db: db,
compress: compress,
ext: fmt.Sprintf(".%s", tsm1.TSMFileExtension),
retentionPolicy: retentionPolicy,
files: make(map[string][]string),
}
}
func (c *cmdExport) validate() error {
// validate args
if c.retentionPolicy != "" && c.db == "" {
return fmt.Errorf("must specify a db")
}
return nil
}
func (c *cmdExport) run() error {
if err := c.validate(); err != nil {
return err
}
return c.export()
}
func (c *cmdExport) export() error {
if err := c.walkFiles(); err != nil {
return err
}
return c.writeFiles()
}
func (c *cmdExport) walkFiles() error {
err := filepath.Walk(c.path, func(path string, f os.FileInfo, err error) error {
if err != nil {
return err
}
if filepath.Ext(path) == c.ext {
//files = append(files, path)
relPath, _ := filepath.Rel(c.path, path)
dirs := strings.Split(relPath, string(byte(os.PathSeparator)))
if dirs[0] == c.db || c.db == "" {
if dirs[1] == c.retentionPolicy || c.retentionPolicy == "" {
key := filepath.Join(dirs[0], dirs[1])
files := c.files[key]
if files == nil {
files = []string{}
}
c.files[key] = append(files, path)
}
}
}
return nil
})
if err != nil {
log.Fatal(err)
}
return nil
}
func (c *cmdExport) writeFiles() error {
// open our output file and create an output buffer
var w io.WriteCloser
w, err := os.Create(c.out)
if err != nil {
return err
}
defer w.Close()
if c.compress {
w = gzip.NewWriter(w)
defer w.Close()
}
// Write out all the DDL
fmt.Fprintln(w, "# DDL")
for key, _ := range c.files {
keys := strings.Split(key, string(byte(os.PathSeparator)))
fmt.Fprintf(w, "CREATE DATABASE %s\n", keys[0])
fmt.Fprintf(w, "CREATE RETENTION POLICY %s ON %s DURATION inf REPLICATION 1\n", keys[1], keys[0])
}
fmt.Fprintln(w, "# DML")
for key, files := range c.files {
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])
for _, f := range files {
// use an anonymous function here to close the files in the defers and not let them
// accumulate in the loop
if err := 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()
for i := 0; i < reader.KeyCount(); i++ {
var pairs string
key, typ := reader.KeyAt(i)
values, _ := reader.ReadAll(key)
measurement, field := tsm1.SeriesAndFieldFromCompositeKey(key)
for _, value := range values {
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, measurement, pairs, value.UnixNano())
}
}
return nil
}(f); err != nil {
return err
}
}
_ = key
}
return nil
}