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log.go
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log.go
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package log
import (
"errors"
"fmt"
"sort"
"strings"
"sync"
"github.com/cuigh/auxo/config"
"github.com/cuigh/auxo/data"
)
const (
LevelDebug = Level(0)
LevelInfo = Level(1)
LevelWarn = Level(2)
LevelError = Level(3)
LevelPanic = Level(4)
LevelFatal = Level(5)
LevelOff = Level(6)
)
var (
levelShortNames = [7]string{"D", "I", "W", "E", "P", "F", "O"}
levelLongNames = [7]string{"DEBUG", "INFO", "WARN", "ERROR", "PANIC", "FATAL", "OFF"}
)
var (
mgr Manager = &manager{}
defaultLevel = LevelDebug
defaultLayout = "[{L}]{T}: {M}{N}"
)
type Level int8
func parseLevel(l string) (lvl Level, err error) {
switch strings.ToLower(l) {
case "debug":
lvl = LevelDebug
case "info":
lvl = LevelInfo
case "warn":
lvl = LevelWarn
case "error":
lvl = LevelError
case "panic":
lvl = LevelPanic
case "fatal":
lvl = LevelFatal
case "off":
lvl = LevelOff
default:
err = errors.New("invalid level: " + l)
}
return
}
func SetManager(m Manager) {
if m != nil {
mgr = m
}
}
func SetDefaultLevel(lvl Level) {
defaultLevel = lvl
}
func Get(name string) Logger {
return mgr.Get(name)
}
func Find(name string) Logger {
return mgr.Find(name)
}
func Configure(opts Options) error {
return mgr.Configure(opts)
}
type Options struct {
Loggers []LoggerOptions
Writers []WriterOptions
}
type LoggerOptions struct {
Name string
Level string
Writers []string
}
type WriterOptions struct {
Name string
// console/file/[omit]
Type string
Layout string
// text/json, default: text
Format string
Options data.Map
}
type Manager interface {
Get(name string) Logger
Find(name string) Logger
Configure(opts Options) error
}
type manager struct {
once sync.Once
root *logger
loggers []*logger
}
func (m *manager) Get(name string) Logger {
l := m.Find(name)
if l == nil {
l = m.root
}
return l
}
func (m *manager) Find(name string) Logger {
m.once.Do(m.initialize)
for _, l := range m.loggers {
if strings.HasPrefix(name, l.name) {
return l
}
}
return nil
}
func (m *manager) Configure(opts Options) error {
// create writers first
writers := map[string]*Writer{}
for _, w := range opts.Writers {
writer, err := newWriter(w.Name, w.Type, w.Format, w.Layout, w.Options)
if err != nil {
return err
}
writers[w.Name] = writer
}
var (
root *logger
loggers = make([]*logger, len(opts.Loggers))
)
for i, li := range opts.Loggers {
lvl, err := parseLevel(li.Level)
if err != nil {
return err
}
loggers[i] = &logger{
name: li.Name,
lvl: lvl,
}
for _, n := range li.Writers {
w := writers[n]
if w == nil {
return errors.New("writer not found: " + n)
}
loggers[i].writers = append(loggers[i].writers, writers[n])
}
if li.Name == "" {
root = loggers[i]
}
}
sort.Slice(loggers, func(i, j int) bool {
return loggers[i].name > loggers[j].name
})
if root == nil {
fmt.Println("Warn: root logger is not configured, set it to default console logger")
} else {
m.root = root
}
m.loggers = loggers
return nil
}
func (m *manager) initialize() {
if m.loggers == nil && config.Exist("log") {
opts := Options{}
err := config.UnmarshalOption("log", &opts)
if err == nil {
err = Configure(opts)
}
if err != nil {
fmt.Println("log > Auto configure failed:", err)
}
}
if m.root == nil {
m.root = m.createDefaultLogger()
}
}
func (m *manager) createDefaultLogger() *logger {
w, err := newWriter("console", "console", "text", defaultLayout, data.Map{})
if err != nil {
panic(err)
}
return &logger{
lvl: defaultLevel,
writers: []*Writer{w},
}
}