Add simple tool for examining WAL files
parent
cb6e897cb5
commit
b238b6c2fb
@ -0,0 +1,66 @@
|
|||||||
|
package main
|
||||||
|
|
||||||
|
import (
|
||||||
|
"flag"
|
||||||
|
"fmt"
|
||||||
|
"io"
|
||||||
|
"os"
|
||||||
|
|
||||||
|
"github.com/rqlite/rqlite/db/wal"
|
||||||
|
)
|
||||||
|
|
||||||
|
const name = `walr`
|
||||||
|
const desc = `walr is a tool for displaying information about WAL files.`
|
||||||
|
|
||||||
|
func init() {
|
||||||
|
flag.Usage = func() {
|
||||||
|
fmt.Fprintf(os.Stderr, "\n%s\n\n", desc)
|
||||||
|
fmt.Fprintf(os.Stderr, "Usage: %s <Path to WAL file>\n", name)
|
||||||
|
flag.PrintDefaults()
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
func main() {
|
||||||
|
flag.Parse()
|
||||||
|
|
||||||
|
if flag.NArg() == 0 {
|
||||||
|
flag.Usage()
|
||||||
|
os.Exit(1)
|
||||||
|
}
|
||||||
|
walPath := flag.Args()[0]
|
||||||
|
|
||||||
|
walFD, err := os.Open(walPath)
|
||||||
|
if err != nil {
|
||||||
|
fmt.Println("failed to open WAL file:", err)
|
||||||
|
os.Exit(1)
|
||||||
|
}
|
||||||
|
|
||||||
|
r := wal.NewWALReader(walFD)
|
||||||
|
if err := r.ReadHeader(); err != nil {
|
||||||
|
fmt.Println("failed to read WAL header:", err)
|
||||||
|
os.Exit(1)
|
||||||
|
}
|
||||||
|
fmt.Println("WAL page size: ", r.PageSize())
|
||||||
|
|
||||||
|
nFrames := 0
|
||||||
|
nCommits := 0
|
||||||
|
uniquePgs := make(map[uint32]struct{})
|
||||||
|
buf := make([]byte, r.PageSize())
|
||||||
|
for {
|
||||||
|
pgno, commit, err := r.ReadFrame(buf)
|
||||||
|
if err == io.EOF {
|
||||||
|
break
|
||||||
|
} else if err != nil {
|
||||||
|
fmt.Println("failed to read WAL frame:", err)
|
||||||
|
os.Exit(1)
|
||||||
|
}
|
||||||
|
uniquePgs[pgno] = struct{}{}
|
||||||
|
nFrames++
|
||||||
|
|
||||||
|
if commit != 0 {
|
||||||
|
nCommits++
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
fmt.Printf("Found %d WAL frames, %d unique pages, %d commit frames\n", nFrames, len(uniquePgs), nCommits)
|
||||||
|
}
|
Loading…
Reference in New Issue