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checkpoint.go
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/
checkpoint.go
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package ethereum
import (
"fmt"
"os"
"path/filepath"
"strconv"
)
type checkpointType string
const (
sendCheckpoint checkpointType = "send"
recvCheckpoint checkpointType = "recv"
)
func checkpointFileName(cpType checkpointType) string {
return string(cpType) + ".cp"
}
func (c *Chain) ensureDataDirectory() (string, error) {
path := filepath.Join(c.homePath, "ethereum", c.ChainID())
if err := os.MkdirAll(path, os.ModePerm); err != nil {
return "", err
}
return path, nil
}
func (c *Chain) loadCheckpoint(cpType checkpointType) (uint64, error) {
dir, err := c.ensureDataDirectory()
if err != nil {
return 0, err
}
bz, err := os.ReadFile(filepath.Join(dir, checkpointFileName(cpType)))
if err != nil {
if os.IsNotExist(err) {
switch cpType {
case sendCheckpoint:
return c.config.InitialSendCheckpoint, nil
case recvCheckpoint:
return c.config.InitialRecvCheckpoint, nil
default:
panic(fmt.Sprintf("unexpected checkpoint type: %v", cpType))
}
}
return 0, err
}
return strconv.ParseUint(string(bz), 10, 64)
}
func (c *Chain) saveCheckpoint(v uint64, cpType checkpointType) error {
bz := []byte(strconv.FormatUint(v, 10))
dir, err := c.ensureDataDirectory()
if err != nil {
return err
}
return os.WriteFile(filepath.Join(dir, checkpointFileName(cpType)), bz, os.ModePerm)
}