binary format for WAL

scripts/cutWALUntil/main.go

@@ -0,0 +1,53 @@
+package main
+
+import (
+	"fmt"
+	"io"
+	"os"
+	"strconv"
+
+	cs "github.com/tendermint/tendermint/consensus"
+)
+
+func main() {
+	var heightToStop uint64
+	var err error
+	if heightToStop, err = strconv.ParseUint(os.Args[2], 10, 64); err != nil {
+		panic(fmt.Errorf("failed to parse height: %v (format: cutWALUntil in heightToStop out)", err))
+	}
+
+	in, err := os.Open(os.Args[1])
+	if err != nil {
+		panic(fmt.Errorf("failed to open WAL file: %v (format: cutWALUntil in heightToStop out)", err))
+	}
+	defer in.Close()
+
+	out, err := os.Create(os.Args[3])
+	if err != nil {
+		panic(fmt.Errorf("failed to open WAL file: %v (format: cutWALUntil in heightToStop out)", err))
+	}
+	defer out.Close()
+
+	enc := cs.NewWALEncoder(out)
+
+	dec := cs.NewWALDecoder(in)
+	for {
+		msg, err := dec.Decode()
+		if err == io.EOF {
+			break
+		} else if err != nil {
+			panic(fmt.Errorf("failed to decode msg: %v", err))
+		}
+
+		if m, ok := msg.Msg.(cs.EndHeightMessage); ok {
+			if m.Height == heightToStop {
+				break
+			}
+		}
+
+		err = enc.Encode(msg)
+		if err != nil {
+			panic(fmt.Errorf("failed to encode msg: %v", err))
+		}
+	}
+}