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main.go
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main.go
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package main
import (
"github.com/wal-g/wal-g"
"log"
"os"
"os/exec"
"time"
"fmt"
"strconv"
"path/filepath"
"strings"
"io"
"bytes"
"github.com/jackc/pgx"
)
func RemoveContents(dir string) error {
d, err := os.Open(dir)
if err != nil {
return err
}
defer d.Close()
names, err := d.Readdirnames(-1)
if err != nil {
return err
}
for _, name := range names {
err = os.RemoveAll(filepath.Join(dir, name))
if err != nil {
return err
}
}
return nil
}
const (
baseDir = "/Users/x4mmm/DemoDb"
restoreDir = "/Users/x4mmm/DemoDbRestore"
pgbin = "/Users/x4mmm/project/bin/"
pgbenchCommand = pgbin + "pgbench"
pgctlCommand = pgbin + "pg_ctl"
initdbCommand = pgbin + "initdb"
)
func main() {
os.Setenv("WALE_S3_PREFIX", os.Getenv("WALE_S3_PREFIX")+"/"+strconv.FormatInt(time.Now().UnixNano(), 10))
tu, pre, err := walg.Configure()
if err != nil {
log.Fatal(err);
}
BenchInit()
Checkpoint()
WipeRestore()
Backup(tu, pre)
Bench()
sync := make(chan interface{})
go func() {
Bench()
sync <- struct{}{}
}()
Backup(tu, pre)
<-sync
Checkpoint()
Backup(tu, pre)
lsn := Fetch(pre)
Diff(*lsn)
}
func Checkpoint() {
config, err := pgx.ParseEnvLibpq()
if err != nil {
log.Fatal(err);
}
conn, err := pgx.Connect(config)
if err != nil {
log.Fatal(err);
}
conn.Query("checkpoint;")
}
func WipeRestore() {
err := RemoveContents(restoreDir)
if err != nil {
log.Fatal(err);
}
err = os.MkdirAll(restoreDir, 0777)
if err != nil {
log.Fatal(err);
}
}
func Fetch(pre *walg.Prefix) *uint64 {
return walg.HandleBackupFetch("LATEST", pre, restoreDir, false)
}
func Diff(lsn uint64) {
out, _ := exec.Command("diff", "-r", baseDir, restoreDir).Output()
outStr := string(out)
fmt.Println(outStr)
if strings.Contains(outStr, "differ") {
PrintDiff(strings.Split(outStr, "\n"), lsn)
log.Fatal("diff output contains difference")
}
}
func PrintDiff(rows []string, lsn uint64) {
for _, r := range rows {
if !strings.Contains(r, "differ") {
continue
}
r = strings.Split(r, "Binary files ")[1]
r = strings.Split(r, " differ")[0]
v := strings.Split(r, " and ")
fmt.Println("File 1: " + v[0])
fmt.Println("File 2: " + v[1])
PagedFileCompare(v[0], v[1], lsn)
}
}
func PagedFileCompare(filename1 string, filename2 string, lsn uint64) {
f1, _ := os.Open(filename1)
f2, _ := os.Open(filename2)
chunkSize := int(walg.BlockSize)
var chunkNumber = 0
for {
b1 := make([]byte, chunkSize)
_, err1 := f1.Read(b1)
b2 := make([]byte, chunkSize)
_, err2 := f2.Read(b2)
if err1 != nil || err2 != nil {
if err1 == io.EOF && err2 == io.EOF {
return
} else if err1 == io.EOF || err2 == io.EOF {
fmt.Println("Files have different sizes")
} else {
log.Fatal(err1, err2)
}
}
if !bytes.Equal(b1, b2) {
fmt.Printf("Bytes at %x differ\n", chunkNumber*chunkSize)
lsn1, valid1 := walg.ParsePageHeader(b1)
fmt.Printf("LSN1 %x valid %v\n", lsn1, valid1)
lsn2, valid2 := walg.ParsePageHeader(b2)
fmt.Printf("LSN2 %x valid %v\n", lsn2, valid2)
if lsn1 != lsn2 {
if (lsn1 < lsn) {
log.Panic("Increment pages did not restore page with different LSN")
} else {
fmt.Println("LSNs differ, but origin is newer than backup")
}
}
//fmt.Println(b1)
//fmt.Println(b2)
for x := 0; x < int(walg.BlockSize); x++ {
//if b1[x]^b2[x] == 1 {
// continue
//}
if b1[x] != b2[x] && b1[x]^b2[x] != 1 {
fmt.Printf("bitdiff %x: Different bytes %x and %x at %x\n", b1[x]^b2[x], b1[x], b2[x], x)
}
}
}
chunkNumber++
}
}
func Bench() {
var err error
out, err := exec.Command(pgbenchCommand, "postgres", "-T", "20", "-c", "3", "-j", "3").Output()
fmt.Println(string(out))
if err != nil {
log.Fatal(err);
}
}
func BenchInit() {
var err error
out, err := exec.Command(pgbenchCommand, "postgres", "-i", "-s", "20").Output()
fmt.Println(string(out))
if err != nil {
log.Fatal(err);
}
}
func Ctl(command string) {
go func() {
var err error
out, err := exec.Command(pgctlCommand, "-D", baseDir, command).Output()
fmt.Println(string(out))
if err != nil {
log.Fatal(err);
}
}()
time.Sleep(100) // peace of shell
}
func InitDb() {
var err error
out, err := exec.Command(initdbCommand, baseDir).Output()
fmt.Println(string(out))
if err != nil {
log.Fatal(err);
}
}
func SetupBench() {
var err error
out, err := exec.Command(pgbenchCommand, "postgres", "-i").Output()
fmt.Println(string(out))
if err != nil {
fmt.Println(err);
}
}
func Backup(tu *walg.TarUploader, pre *walg.Prefix) {
walg.HandleBackupPush(baseDir, tu, pre)
}