forgejo/modules/log/logger_impl.go
wxiaoguang 7314726bab
Do not output "Trace" level logs from process manager by default (#24952)
The old process manager's `Trace` function by default calls `log.Printf`
to output "trace" level logs. That's not ideal because by default the
trace level logs should not be outputted. In history it didn't cause
problems because there was no other call to the process manager before
the logger system's initialization.

But if there is any package using the process manager before the "Trace"
function gets assigned to the logger system's trace function, the
process manager will outputs unexpected verbose messages, this behavior
is not expected in most cases.

Now, the logger system also uses process manager to manage its goroutine
contexts, so it's the time to fix the old "trace" behavior: by default,
do not output the trace level messages. Fix #24951
2023-05-27 10:55:24 +00:00

239 lines
6.1 KiB
Go

// Copyright 2023 The Gitea Authors. All rights reserved.
// SPDX-License-Identifier: MIT
package log
import (
"context"
"runtime"
"strings"
"sync"
"sync/atomic"
"time"
"code.gitea.io/gitea/modules/json"
"code.gitea.io/gitea/modules/util"
)
type LoggerImpl struct {
LevelLogger
ctx context.Context
ctxCancel context.CancelFunc
level atomic.Int32
stacktraceLevel atomic.Int32
eventWriterMu sync.RWMutex
eventWriters map[string]EventWriter
}
var (
_ BaseLogger = (*LoggerImpl)(nil)
_ LevelLogger = (*LoggerImpl)(nil)
)
// SendLogEvent sends a log event to all writers
func (l *LoggerImpl) SendLogEvent(event *Event) {
l.eventWriterMu.RLock()
defer l.eventWriterMu.RUnlock()
if len(l.eventWriters) == 0 {
FallbackErrorf("[no logger writer]: %s", event.MsgSimpleText)
return
}
// the writers have their own goroutines, the message arguments (with Stringer) shouldn't be used in other goroutines
// so the event message must be formatted here
msgFormat, msgArgs := event.msgFormat, event.msgArgs
event.msgFormat, event.msgArgs = "(already processed by formatters)", nil
for _, w := range l.eventWriters {
if event.Level < w.GetLevel() {
continue
}
formatted := &EventFormatted{
Origin: event,
Msg: w.Base().FormatMessage(w.Base().Mode, event, msgFormat, msgArgs...),
}
select {
case w.Base().Queue <- formatted:
default:
bs, _ := json.Marshal(event)
FallbackErrorf("log writer %q queue is full, event: %v", w.GetWriterName(), string(bs))
}
}
}
// syncLevelInternal syncs the level of the logger with the levels of the writers
func (l *LoggerImpl) syncLevelInternal() {
lowestLevel := NONE
for _, w := range l.eventWriters {
if w.GetLevel() < lowestLevel {
lowestLevel = w.GetLevel()
}
}
l.level.Store(int32(lowestLevel))
lowestLevel = NONE
for _, w := range l.eventWriters {
if w.Base().Mode.StacktraceLevel < lowestLevel {
lowestLevel = w.GetLevel()
}
}
l.stacktraceLevel.Store(int32(lowestLevel))
}
// removeWriterInternal removes a writer from the logger, and stops it if it's not shared
func (l *LoggerImpl) removeWriterInternal(w EventWriter) {
if !w.Base().shared {
eventWriterStopWait(w) // only stop non-shared writers, shared writers are managed by the manager
}
delete(l.eventWriters, w.GetWriterName())
}
// AddWriters adds writers to the logger, and starts them. Existing writers will be replaced by new ones.
func (l *LoggerImpl) AddWriters(writer ...EventWriter) {
l.eventWriterMu.Lock()
defer l.eventWriterMu.Unlock()
for _, w := range writer {
if old, ok := l.eventWriters[w.GetWriterName()]; ok {
l.removeWriterInternal(old)
}
}
for _, w := range writer {
l.eventWriters[w.GetWriterName()] = w
eventWriterStartGo(l.ctx, w, false)
}
l.syncLevelInternal()
}
// RemoveWriter removes a writer from the logger, and the writer is closed and flushed if it is not shared
func (l *LoggerImpl) RemoveWriter(modeName string) error {
l.eventWriterMu.Lock()
defer l.eventWriterMu.Unlock()
w, ok := l.eventWriters[modeName]
if !ok {
return util.ErrNotExist
}
l.removeWriterInternal(w)
l.syncLevelInternal()
return nil
}
// RemoveAllWriters removes all writers from the logger, non-shared writers are closed and flushed
func (l *LoggerImpl) RemoveAllWriters() *LoggerImpl {
l.eventWriterMu.Lock()
defer l.eventWriterMu.Unlock()
for _, w := range l.eventWriters {
l.removeWriterInternal(w)
}
l.eventWriters = map[string]EventWriter{}
l.syncLevelInternal()
return l
}
// DumpWriters dumps the writers as a JSON map, it's used for debugging and display purposes.
func (l *LoggerImpl) DumpWriters() map[string]any {
l.eventWriterMu.RLock()
defer l.eventWriterMu.RUnlock()
writers := make(map[string]any, len(l.eventWriters))
for k, w := range l.eventWriters {
bs, err := json.Marshal(w.Base().Mode)
if err != nil {
FallbackErrorf("marshal writer %q to dump failed: %v", k, err)
continue
}
m := map[string]any{}
_ = json.Unmarshal(bs, &m)
m["WriterType"] = w.GetWriterType()
writers[k] = m
}
return writers
}
// Close closes the logger, non-shared writers are closed and flushed
func (l *LoggerImpl) Close() {
l.RemoveAllWriters()
l.ctxCancel()
}
// IsEnabled returns true if the logger is enabled: it has a working level and has writers
// Fatal is not considered as enabled, because it's a special case and the process just exits
func (l *LoggerImpl) IsEnabled() bool {
l.eventWriterMu.RLock()
defer l.eventWriterMu.RUnlock()
return l.level.Load() < int32(FATAL) && len(l.eventWriters) > 0
}
// Log prepares the log event, if the level matches, the event will be sent to the writers
func (l *LoggerImpl) Log(skip int, level Level, format string, logArgs ...any) {
if Level(l.level.Load()) > level {
return
}
event := &Event{
Time: time.Now(),
Level: level,
Caller: "?()",
}
pc, filename, line, ok := runtime.Caller(skip + 1)
if ok {
fn := runtime.FuncForPC(pc)
if fn != nil {
event.Caller = fn.Name() + "()"
}
}
event.Filename, event.Line = strings.TrimPrefix(filename, projectPackagePrefix), line
if l.stacktraceLevel.Load() <= int32(level) {
event.Stacktrace = Stack(skip + 1)
}
labels := getGoroutineLabels()
if labels != nil {
event.GoroutinePid = labels["pid"]
}
// get a simple text message without color
msgArgs := make([]any, len(logArgs))
copy(msgArgs, logArgs)
// handle LogStringer values
for i, v := range msgArgs {
if cv, ok := v.(*ColoredValue); ok {
if s, ok := cv.v.(LogStringer); ok {
cv.v = logStringFormatter{v: s}
}
} else if s, ok := v.(LogStringer); ok {
msgArgs[i] = logStringFormatter{v: s}
}
}
event.MsgSimpleText = colorSprintf(false, format, msgArgs...)
event.msgFormat = format
event.msgArgs = msgArgs
l.SendLogEvent(event)
}
func (l *LoggerImpl) GetLevel() Level {
return Level(l.level.Load())
}
func NewLoggerWithWriters(ctx context.Context, name string, writer ...EventWriter) *LoggerImpl {
l := &LoggerImpl{}
l.ctx, l.ctxCancel = newProcessTypedContext(ctx, "Logger: "+name)
l.LevelLogger = BaseLoggerToGeneralLogger(l)
l.eventWriters = map[string]EventWriter{}
l.syncLevelInternal()
l.AddWriters(writer...)
return l
}