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package engine
import (
"os"
"path/filepath"
"sync"
)
// RingLog keeps last N log lines in memory and optionally writes to file.
type RingLog struct {
mu sync.Mutex
lines []string
max int
file *os.File
}
// NewRingLog creates a ring buffer logger.
func NewRingLog(maxLines int, dataDir string) *RingLog {
rl := &RingLog{
lines: make([]string, 0, maxLines),
max: maxLines,
}
if dataDir != "" {
f, err := os.OpenFile(filepath.Join(dataDir, "vpnem.log"),
os.O_CREATE|os.O_WRONLY|os.O_APPEND, 0o644)
if err == nil {
rl.file = f
}
}
return rl
}
// Add appends a line.
func (rl *RingLog) Add(line string) {
rl.mu.Lock()
defer rl.mu.Unlock()
if len(rl.lines) >= rl.max {
rl.lines = rl.lines[1:]
}
rl.lines = append(rl.lines, line)
if rl.file != nil {
rl.file.WriteString(line + "\n")
}
}
// Lines returns all current lines.
func (rl *RingLog) Lines() []string {
rl.mu.Lock()
defer rl.mu.Unlock()
cp := make([]string, len(rl.lines))
copy(cp, rl.lines)
return cp
}
// Close closes the log file.
func (rl *RingLog) Close() {
if rl.file != nil {
rl.file.Close()
}
}
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