Logger package for gitea repositories
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// Copyright 2019 The Gitea Authors. All rights reserved.
// Use of this source code is governed by a MIT-style
// license that can be found in the LICENSE file.
package log
import (
"fmt"
"sync"
"time"
)
// Event represents a logging event
type Event struct {
level Level
msg string
caller string
filename string
line int
time time.Time
stacktrace string
}
// EventLogger represents the behaviours of a logger
type EventLogger interface {
LogEvent(event *Event) error
Close()
Flush()
GetLevel() Level
GetStacktraceLevel() Level
GetName() string
}
// ChannelledLog represents a cached channel to a LoggerProvider
type ChannelledLog struct {
name string
provider string
queue chan *Event
loggerProvider LoggerProvider
flush chan bool
close chan bool
closed chan bool
}
// NewChannelledLog a new logger instance with given logger provider and config.
func NewChannelledLog(name, provider, config string, bufferLength int64) (*ChannelledLog, error) {
if log, ok := providers[provider]; ok {
l := &ChannelledLog{
queue: make(chan *Event, bufferLength),
flush: make(chan bool),
close: make(chan bool),
closed: make(chan bool),
}
l.loggerProvider = log()
if err := l.loggerProvider.Init(config); err != nil {
return nil, err
}
l.name = name
l.provider = provider
go l.Start()
return l, nil
}
return nil, ErrUnknownProvider{provider}
}
// Start processing the ChannelledLog
func (l *ChannelledLog) Start() {
for {
select {
case event, ok := <-l.queue:
if !ok {
l.closeLogger()
return
}
l.loggerProvider.LogEvent(event)
case _, ok := <-l.flush:
if !ok {
l.closeLogger()
return
}
l.loggerProvider.Flush()
case <-l.close:
l.closeLogger()
return
}
}
}
// LogEvent logs an event to this ChannelledLog
func (l *ChannelledLog) LogEvent(event *Event) error {
select {
case l.queue <- event:
return nil
case <-time.After(60 * time.Second):
// We're blocked!
return ErrTimeout{
Name: l.name,
Provider: l.provider,
}
}
}
func (l *ChannelledLog) closeLogger() {
l.loggerProvider.Flush()
l.loggerProvider.Close()
l.closed <- true
}
// Close this ChannelledLog
func (l *ChannelledLog) Close() {
l.close <- true
<-l.closed
}
// Flush this ChannelledLog
func (l *ChannelledLog) Flush() {
l.flush <- true
}
// GetLevel gets the level of this ChannelledLog
func (l *ChannelledLog) GetLevel() Level {
return l.loggerProvider.GetLevel()
}
// GetStacktraceLevel gets the level of this ChannelledLog
func (l *ChannelledLog) GetStacktraceLevel() Level {
return l.loggerProvider.GetStacktraceLevel()
}
// GetName returns the name of this ChannelledLog
func (l *ChannelledLog) GetName() string {
return l.name
}
// MultiChannelledLog represents a cached channel to a LoggerProvider
type MultiChannelledLog struct {
name string
bufferLength int64
queue chan *Event
mutex sync.Mutex
loggers map[string]EventLogger
flush chan bool
close chan bool
started bool
level Level
stacktraceLevel Level
closed chan bool
}
// NewMultiChannelledLog a new logger instance with given logger provider and config.
func NewMultiChannelledLog(name string, bufferLength int64) *MultiChannelledLog {
m := &MultiChannelledLog{
name: name,
queue: make(chan *Event, bufferLength),
flush: make(chan bool),
bufferLength: bufferLength,
loggers: make(map[string]EventLogger),
level: NONE,
stacktraceLevel: NONE,
close: make(chan bool),
closed: make(chan bool),
}
return m
}
// AddLogger adds a logger to this MultiChannelledLog
func (m *MultiChannelledLog) AddLogger(logger EventLogger) error {
m.mutex.Lock()
name := logger.GetName()
if _, has := m.loggers[name]; has {
m.mutex.Unlock()
return ErrDuplicateName{name}
}
m.loggers[name] = logger
if logger.GetLevel() < m.level {
m.level = logger.GetLevel()
}
if logger.GetStacktraceLevel() < m.stacktraceLevel {
m.stacktraceLevel = logger.GetStacktraceLevel()
}
m.mutex.Unlock()
go m.Start()
return nil
}
// DelLogger removes a sub logger from this MultiChannelledLog
// NB: If you delete the last sublogger this logger will simply drop
// log events
func (m *MultiChannelledLog) DelLogger(name string) bool {
m.mutex.Lock()
logger, has := m.loggers[name]
if !has {
m.mutex.Unlock()
return false
}
delete(m.loggers, name)
m.internalResetLevel()
m.mutex.Unlock()
logger.Flush()
logger.Close()
return true
}
// GetEventLogger returns a sub logger from this MultiChannelledLog
func (m *MultiChannelledLog) GetEventLogger(name string) EventLogger {
m.mutex.Lock()
defer m.mutex.Unlock()
return m.loggers[name]
}
// GetEventLoggerNames returns a list of names
func (m *MultiChannelledLog) GetEventLoggerNames() []string {
m.mutex.Lock()
defer m.mutex.Unlock()
var keys []string
for k := range m.loggers {
keys = append(keys, k)
}
return keys
}
func (m *MultiChannelledLog) closeLoggers() {
m.mutex.Lock()
for _, logger := range m.loggers {
logger.Flush()
logger.Close()
}
m.mutex.Unlock()
m.closed <- true
}
// Start processing the MultiChannelledLog
func (m *MultiChannelledLog) Start() {
m.mutex.Lock()
if m.started {
m.mutex.Unlock()
return
}
m.started = true
m.mutex.Unlock()
for {
select {
case event, ok := <-m.queue:
if !ok {
m.closeLoggers()
return
}
m.mutex.Lock()
for _, logger := range m.loggers {
err := logger.LogEvent(event)
if err != nil {
fmt.Println(err)
}
}
m.mutex.Unlock()
case _, ok := <-m.flush:
if !ok {
m.closeLoggers()
return
}
m.mutex.Lock()
for _, logger := range m.loggers {
logger.Flush()
}
m.mutex.Unlock()
case <-m.close:
m.closeLoggers()
return
}
}
}
// LogEvent logs an event to this MultiChannelledLog
func (m *MultiChannelledLog) LogEvent(event *Event) error {
select {
case m.queue <- event:
return nil
case <-time.After(60 * time.Second):
// We're blocked!
return ErrTimeout{
Name: m.name,
Provider: "MultiChannelledLog",
}
}
}
// Close this MultiChannelledLog
func (m *MultiChannelledLog) Close() {
m.close <- true
<-m.closed
}
// Flush this ChannelledLog
func (m *MultiChannelledLog) Flush() {
m.flush <- true
}
// GetLevel gets the level of this MultiChannelledLog
func (m *MultiChannelledLog) GetLevel() Level {
return m.level
}
// GetStacktraceLevel gets the level of this MultiChannelledLog
func (m *MultiChannelledLog) GetStacktraceLevel() Level {
return m.stacktraceLevel
}
func (m *MultiChannelledLog) internalResetLevel() Level {
m.level = NONE
for _, logger := range m.loggers {
level := logger.GetLevel()
if level < m.level {
m.level = level
}
level = logger.GetStacktraceLevel()
if level < m.stacktraceLevel {
m.stacktraceLevel = level
}
}
return m.level
}
// ResetLevel will reset the level of this MultiChannelledLog
func (m *MultiChannelledLog) ResetLevel() Level {
m.mutex.Lock()
defer m.mutex.Unlock()
return m.internalResetLevel()
}
// GetName gets the name of this MultiChannelledLog
func (m *MultiChannelledLog) GetName() string {
return m.name
}