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https://github.com/go-gitea/gitea
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7314726bab
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
142 lines
3.3 KiB
Go
142 lines
3.3 KiB
Go
// Copyright 2023 The Gitea Authors. All rights reserved.
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// SPDX-License-Identifier: MIT
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package log
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import (
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"context"
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"fmt"
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"sync"
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"sync/atomic"
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)
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const DEFAULT = "default"
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// LoggerManager manages loggers and shared event writers
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type LoggerManager struct {
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ctx context.Context
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ctxCancel context.CancelFunc
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mu sync.Mutex
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writers map[string]EventWriter
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loggers map[string]*LoggerImpl
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defaultLogger atomic.Pointer[LoggerImpl]
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pauseMu sync.RWMutex
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pauseChan chan struct{}
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}
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// GetLogger returns a logger with the given name. If the logger doesn't exist, a new empty one will be created.
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func (m *LoggerManager) GetLogger(name string) *LoggerImpl {
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if name == DEFAULT {
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if logger := m.defaultLogger.Load(); logger != nil {
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return logger
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}
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}
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m.mu.Lock()
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defer m.mu.Unlock()
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logger := m.loggers[name]
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if logger == nil {
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logger = NewLoggerWithWriters(m.ctx, name)
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m.loggers[name] = logger
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if name == DEFAULT {
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m.defaultLogger.Store(logger)
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}
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}
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return logger
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}
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// PauseAll pauses all event writers
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func (m *LoggerManager) PauseAll() {
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m.pauseMu.Lock()
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m.pauseChan = make(chan struct{})
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m.pauseMu.Unlock()
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}
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// ResumeAll resumes all event writers
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func (m *LoggerManager) ResumeAll() {
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m.pauseMu.Lock()
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close(m.pauseChan)
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m.pauseChan = nil
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m.pauseMu.Unlock()
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}
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// GetPauseChan returns a channel for writer pausing
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func (m *LoggerManager) GetPauseChan() chan struct{} {
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m.pauseMu.RLock()
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defer m.pauseMu.RUnlock()
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return m.pauseChan
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}
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// Close closes the logger manager, all loggers and writers will be closed, the messages are flushed.
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func (m *LoggerManager) Close() {
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m.mu.Lock()
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defer m.mu.Unlock()
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for _, logger := range m.loggers {
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logger.Close()
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}
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m.loggers = map[string]*LoggerImpl{}
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for _, writer := range m.writers {
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eventWriterStopWait(writer)
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}
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m.writers = map[string]EventWriter{}
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m.ctxCancel()
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}
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// DumpLoggers returns a map of all loggers and their event writers, for debugging and display purposes.
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func (m *LoggerManager) DumpLoggers() map[string]any {
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m.mu.Lock()
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defer m.mu.Unlock()
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dump := map[string]any{}
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for name, logger := range m.loggers {
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loggerDump := map[string]any{
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"IsEnabled": logger.IsEnabled(),
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"EventWriters": logger.DumpWriters(),
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}
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dump[name] = loggerDump
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}
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return dump
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}
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// NewSharedWriter creates a new shared event writer, it can be used by multiple loggers, and a shared writer won't be closed if a logger is closed.
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func (m *LoggerManager) NewSharedWriter(writerName, writerType string, mode WriterMode) (writer EventWriter, err error) {
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m.mu.Lock()
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defer m.mu.Unlock()
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if _, ok := m.writers[writerName]; ok {
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return nil, fmt.Errorf("log event writer %q has been added before", writerName)
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}
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if writer, err = NewEventWriter(writerName, writerType, mode); err != nil {
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return nil, err
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}
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m.writers[writerName] = writer
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eventWriterStartGo(m.ctx, writer, true)
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return writer, nil
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}
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func (m *LoggerManager) GetSharedWriter(writerName string) EventWriter {
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m.mu.Lock()
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defer m.mu.Unlock()
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return m.writers[writerName]
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}
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var loggerManager = NewManager()
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func GetManager() *LoggerManager {
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return loggerManager
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}
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func NewManager() *LoggerManager {
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m := &LoggerManager{writers: map[string]EventWriter{}, loggers: map[string]*LoggerImpl{}}
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m.ctx, m.ctxCancel = newProcessTypedContext(context.Background(), "LoggerManager")
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return m
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}
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