finished tag implementation

pkg/log/scanlog.go

@@ -0,0 +1,47 @@
+package log
+
+import (
+	"fmt"
+	"git.giftfish.de/ston1th/docstore/pkg/core"
+	"sync"
+)
+
+const defaultSize = 500
+
+type ScanLog struct {
+	// protects logs
+	sync.RWMutex
+
+	size int
+	logs []string
+}
+
+func NewScanLog(size int) *ScanLog {
+	if size <= 0 {
+		size = defaultSize
+	}
+	return &ScanLog{size: size}
+}
+
+func (l *ScanLog) Printf(f string, v ...interface{}) {
+	s := fmt.Sprintf(f, v...)
+	Println(s)
+	s = core.LogTime() + s
+	l.Lock()
+	logsLen := len(l.logs)
+	if logsLen < l.size {
+		l.logs = append(l.logs, s)
+	} else if logsLen == l.size {
+		l.logs = append(l.logs[1:], s)
+	}
+	l.Unlock()
+}
+
+func (l *ScanLog) Logs() (logs string) {
+	l.RLock()
+	for _, v := range l.logs {
+		logs += "\n" + v
+	}
+	l.RUnlock()
+	return
+}