72 lines
1.2 KiB
Go
72 lines
1.2 KiB
Go
// Copyright (C) 2021 Marius Schellenberger
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package log
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import (
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"fmt"
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"git.giftfish.de/ston1th/docstore/pkg/core"
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"strings"
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"sync"
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)
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const defaultSize = 500
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type ScanLog struct {
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// protects logs
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mu sync.RWMutex
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size int
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logs []string
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}
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func NewScanLog(size int) *ScanLog {
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if size <= 0 {
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size = defaultSize
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}
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return &ScanLog{size: size}
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}
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func (l *ScanLog) Printf(f string, v ...interface{}) {
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s := fmt.Sprintf(f, v...)
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Println(s)
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s = core.LogTime() + s
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l.mu.Lock()
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llen := len(l.logs)
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if llen < l.size {
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l.logs = append(l.logs, s)
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} else if llen == l.size {
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l.logs = append(l.logs[1:], s)
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}
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l.mu.Unlock()
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}
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func (l *ScanLog) Logs() (logs string) {
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l.mu.RLock()
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logs = reverseJoin(l.logs, "\n")
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l.mu.RUnlock()
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return
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}
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// reverseJoin is a reverse version of strings.Join
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// code taken from strings.Join
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func reverseJoin(a []string, sep string) string {
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switch len(a) {
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case 0:
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return ""
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case 1:
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return a[0]
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}
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n := len(sep) * (len(a) - 1)
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for i := 0; i < len(a); i++ {
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n += len(a[i])
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}
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var b strings.Builder
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b.Grow(n)
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b.WriteString(a[len(a)-1])
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for i := len(a) - 2; i >= 0; i-- {
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b.WriteString(sep)
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b.WriteString(a[i])
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}
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return b.String()
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}
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