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package web
import (
"fmt"
"os"
"sync"
)
// logStore is implemented by the production jj sidecar and by the file-backed
// adapter used in tests. Append's callback makes session note numbering atomic
// with the content update.
type logStore interface {
Read() ([]byte, error)
Generation() (string, error)
Append(func(current []byte) ([]byte, error)) error
String() string
}
type fileLog struct {
path string
mu sync.Mutex
}
func newFileLog(path string) *fileLog { return &fileLog{path: path} }
func (l *fileLog) String() string { return l.path }
func (l *fileLog) Read() ([]byte, error) { return os.ReadFile(l.path) }
func (l *fileLog) Generation() (string, error) {
info, err := os.Stat(l.path)
if err != nil {
return "", err
}
return fmt.Sprintf("%d:%d", info.Size(), info.ModTime().UnixNano()), nil
}
func (l *fileLog) Append(makePayload func(current []byte) ([]byte, error)) error {
l.mu.Lock()
defer l.mu.Unlock()
current, err := os.ReadFile(l.path)
if err != nil && !os.IsNotExist(err) {
return err
}
payload, err := makePayload(current)
if err != nil {
return err
}
f, err := os.OpenFile(l.path, os.O_CREATE|os.O_APPEND|os.O_WRONLY, 0o644)
if err != nil {
return err
}
defer f.Close()
_, err = f.Write(payload)
return err
}
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