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log_file.go
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log_file.go
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package log
import (
"bytes"
"context"
"encoding/json"
"fmt"
"io/fs"
"os"
"path/filepath"
"regexp"
"sort"
"strings"
"time"
"github.com/Andrew-M-C/go-bytesize"
"github.com/Andrew-M-C/go.util/log/trace"
"github.com/Andrew-M-C/go.util/runtime/caller"
timeutil "github.com/Andrew-M-C/go.util/time"
)
type logItem struct {
Time string
Location string
Level Level
Content string
TraceID string
}
func (l *logItem) marshalJSONWithBuffer(by []byte) ([]byte, error) {
buff := bytes.NewBuffer(by[:0])
buff.WriteByte('{')
buff.WriteString(`"time":"`)
buff.WriteString(l.Time)
buff.WriteString(`","level":"`)
buff.WriteString(l.Level.String())
buff.WriteString(`","location":`)
b, _ := json.Marshal(l.Location)
buff.Write(b)
buff.WriteString(`,"content":`)
b, _ = json.Marshal(l.Content)
buff.Write(b)
if l.TraceID != "" {
buff.WriteString(`,"trace_id":`)
b, _ := json.Marshal(l.TraceID)
buff.Write(b)
}
buff.WriteByte('}')
return buff.Bytes(), nil
}
// SetFileName 设置文件名
func SetFileName(name string) {
bdr := strings.Builder{}
bdr.WriteString(name)
name = bdr.String() // copy
if name != "" {
internal.file.name = &name
}
}
// SetFileSize 设置滚动日志文件大小, 最小 10 KB
func SetFileSize(size int64) {
if size < 10*1000 {
size = 10 * 1000
}
internal.file.size = size
}
type fileLog Level
func (l fileLog) logf(f string, a ...any) {
ca := caller.GetCaller(internalGetCallerSkip())
item := &logItem{
Time: timeDesc(),
Level: Level(l),
Location: callerDesc(ca),
Content: fmt.Sprintf(f, a...),
}
l.add(item)
}
func (l fileLog) log(a ...any) {
ca := caller.GetCaller(internalGetCallerSkip())
item := &logItem{
Time: timeDesc(),
Level: Level(l),
Location: callerDesc(ca),
Content: fmt.Sprint(a...),
}
l.add(item)
}
func (l fileLog) logCtxf(ctx context.Context, f string, a ...any) {
id := trace.GetTraceID(ctx)
ca := caller.GetCaller(internalGetCallerSkip())
item := &logItem{
Time: timeDesc(),
Level: Level(l),
Location: callerDesc(ca),
Content: fmt.Sprintf(f, a...),
TraceID: id,
}
l.add(item)
}
func (l fileLog) logCtx(ctx context.Context, a ...any) {
id := trace.GetTraceID(ctx)
ca := caller.GetCaller(internalGetCallerSkip())
item := &logItem{
Time: timeDesc(),
Level: Level(l),
Location: callerDesc(ca),
Content: fmt.Sprint(a...),
TraceID: id,
}
l.add(item)
}
func (l fileLog) add(item *logItem) {
internal.file.lock.Lock()
defer internal.file.lock.Unlock()
internal.file.logs = append(internal.file.logs, item)
}
func fileLogRoutine() {
defer func() {
if e := recover(); e != nil {
consoleLog(ErrorLevel).logf("panic, error: %v", e)
}
go fileLogRoutine()
}()
var fd *os.File
var name string
var err error
newLine := []byte{'\n'}
prevBuffer := make([]*logItem, 0, 1000)
iterate := func() {
// 如果没有日志请求, 那么啥都不用做
internal.file.lock.Lock()
if len(internal.file.logs) == 0 {
internal.file.lock.Unlock()
return
}
internal.file.lock.Unlock()
fd, name, err = renewFileHandle(name, fd)
if err != nil {
func() { consoleLog(ErrorLevel).logf("renew file log error: %v", err) }()
return
}
// 切换一下
internal.file.lock.Lock()
prevBuffer, internal.file.logs = internal.file.logs, prevBuffer
internal.file.lock.Unlock()
writtenBytes := 0
buff := make([]byte, 4096)
for _, item := range prevBuffer {
b, _ := item.marshalJSONWithBuffer(buff)
n, _ := fd.Write(b)
writtenBytes += n
n, _ = fd.Write(newLine)
writtenBytes += n
}
internal.debugf("写入 %d 行日志, %v, 文件: %v", len(prevBuffer), bytesize.Base10(writtenBytes), name)
_ = fd.Sync()
// func() { consoleLog(DebugLevel).logf("written %d lines to file %v", len(prevBuffer), name) }()
prevBuffer = prevBuffer[:0]
}
for {
time.Sleep(time.Second)
iterate()
}
}
func renewFileHandle(prevName string, prevFd *os.File) (fd *os.File, name string, err error) {
name = *internal.file.name
if name != prevName || prevFd == nil {
if prevFd != nil {
prevFd.Close()
}
// 直接打开新文件
f, err := os.OpenFile(name, os.O_CREATE|os.O_RDWR|os.O_APPEND, 0644)
if f == nil {
return prevFd, name, fmt.Errorf("open '%s' error: %w", name, err)
}
return f, name, nil
}
// 检查一下文件大小是不是已经满了?
st, err := os.Stat(prevName)
if err != nil {
internal.debugf("日志文件未满 %s", prevName)
// 那就不用重命名了
return prevFd, name, nil
}
if st.Size() < internal.file.size {
return prevFd, name, nil
}
// 需要重命名文件
prevFd.Close()
newFileName := func() string {
now := time.Now().In(timeutil.Beijing).Format("2006-01-02-15:04:05")
ext := filepath.Ext(name)
if ext == "" {
return fmt.Sprintf("%s_%s", name, now)
}
return fmt.Sprintf("%s_%s%s", strings.TrimSuffix(name, ext), now, ext)
}()
_ = os.Rename(name, newFileName)
// 新建一个文件返回
f, err := os.OpenFile(prevName, os.O_CREATE|os.O_RDWR|os.O_APPEND, 0644)
if err != nil {
return prevFd, name, fmt.Errorf("open new file '%s' error: %w", name, err)
}
if err = clearOldLogFiles(name); err != nil {
return f, name, fmt.Errorf("rename older files error: %w", err)
}
return f, name, err
}
// 清除旧日志文件
func clearOldLogFiles(name string) error {
const maxFileNum = 10
dir := filepath.Dir(name)
// 首先检查日志下面的所有文件
files, err := os.ReadDir(dir)
if err != nil {
return err
}
suffix := filepath.Ext(name)
prefix := strings.TrimSuffix(filepath.Base(name), suffix)
// 把文件名掐头去尾, 剩下的部分就理应是日期格式
r := regexp.MustCompile(`_20\d\d-[01]\d-\d\d-[012]\d:\d\d:\d\d`)
filesToHandle := make([]fs.DirEntry, 0, len(files))
fileInfos := make(map[string]os.FileInfo, len(files))
for _, f := range files {
if f.IsDir() {
internal.debugf("忽略目录 %s", f.Name())
continue
}
base := strings.TrimPrefix(f.Name(), prefix)
base = strings.TrimSuffix(base, suffix)
// 剩余部分如果 match 的话, 那么就是需要处理的文件
if !r.MatchString(base) {
internal.debugf("忽略文件 %s (base: %v)", f.Name(), base)
continue
}
s, err := os.Stat(f.Name())
if err != nil {
internal.debugf("stat file %v error:%v", f.Name(), err)
continue
}
filesToHandle = append(filesToHandle, f)
fileInfos[f.Name()] = s
}
total := len(filesToHandle)
if total < maxFileNum {
internal.debugf("no need to delete log file, cnt %d", total)
return nil
}
// 排序, 从旧到新
sort.Slice(filesToHandle, func(i, j int) bool {
fi, fj := filesToHandle[i], filesToHandle[j]
modTimeI := fileInfos[fi.Name()].ModTime()
modTimeJ := fileInfos[fj.Name()].ModTime()
return modTimeI.Before(modTimeJ)
})
remains := total
for _, f := range filesToHandle {
if err := os.Remove(f.Name()); err != nil {
internal.debugf("removed file %v error: %v", f.Name(), err)
continue
}
internal.debugf("removed log file %v", f.Name())
remains--
if remains < maxFileNum {
break
}
}
return nil
}