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log.go
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log.go
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package logstash
import (
"container/ring"
"io"
"slices"
"strings"
"sync"
jww "github.com/spf13/jwalterweatherman"
"golang.org/x/exp/maps"
)
var DefaultHandler = New(10000)
func Areas() []string {
return DefaultHandler.Areas()
}
func All(areas []string, level jww.Threshold, count int) []string {
return DefaultHandler.All(areas, level, count)
}
func Size() int64 {
return DefaultHandler.Size()
}
type logger struct {
mu sync.RWMutex
data *ring.Ring
size int
}
func New(size int) *logger {
return &logger{
data: ring.New(1),
size: size,
}
}
var _ io.Writer = (*logger)(nil)
func (l *logger) Write(p []byte) (n int, err error) {
l.mu.Lock()
defer l.mu.Unlock()
if !strings.HasPrefix(string(p), "[cache ]") {
l.data.Value = element(string(p))
// dynamically grow the ring
if l.data.Len() < l.size {
l.data.Link(ring.New(1))
}
l.data = l.data.Next()
}
return len(p), nil
}
func (l *logger) Size() int64 {
l.mu.RLock()
defer l.mu.RUnlock()
r := l.data
var size int64
for i := 0; i < r.Len(); i++ {
if e, ok := r.Value.(element); ok {
size += int64(len(e))
}
r = r.Next()
}
return size
}
func (l *logger) Areas() []string {
l.mu.RLock()
defer l.mu.RUnlock()
r := l.data
areas := make(map[string]struct{})
for range r.Len() {
r = r.Prev()
if e, ok := r.Value.(element); ok && e != "" {
if a, _ := e.areaLevel(); a != "" {
areas[a] = struct{}{}
}
}
}
keys := maps.Keys(areas)
slices.Sort(keys)
return keys
}
func (l *logger) All(areas []string, level jww.Threshold, count int) []string {
l.mu.RLock()
defer l.mu.RUnlock()
r := l.data
all := len(areas) == 0 && level == jww.LevelTrace
res := make([]string, 0, r.Len())
for range r.Len() {
if e, ok := r.Value.(element); ok && e != "" && (all || e.match(areas, level)) {
res = append(res, string(e))
}
r = r.Next()
}
if count > 0 && len(res) > count {
res = res[len(res)-count:]
}
return res
}