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logger.go
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logger.go
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package golog
import (
"fmt"
"io"
"os"
"sync"
"time"
"github.com/hidevopsio/pio"
)
// Handler is the signature type for logger's handler.
//
// A Handler can be used to intercept the message between a log value
// and the actual print operation, it's called
// when one of the print functions called.
// If it's return value is true then it means that the specific
// handler handled the log by itself therefore no need to
// proceed with the default behavior of printing the log
// to the specified logger's output.
//
// It stops on the handler which returns true firstly.
// The `Log` value holds the level of the print operation as well.
type Handler func(value *Log) (handled bool)
// Logger is our golog.
type Logger struct {
Prefix []byte
Level Level
TimeFormat string
// if new line should be added on all log functions, even the `F`s.
// It defaults to true.
//
// See `golog#NewLine(newLineChar string)` as well.
//
// Note that this will not override the time and level prefix,
// if you want to customize the log message please read the examples
// or navigate to: https://github.com/kataras/golog/issues/3#issuecomment-355895870.
NewLine bool
mu sync.Mutex
Printer *pio.Printer
handlers []Handler
once sync.Once
logs sync.Pool
children *loggerMap
}
// New returns a new golog with a default output to `os.Stdout`
// and level to `InfoLevel`.
func New() *Logger {
return &Logger{
Level: InfoLevel,
TimeFormat: "2006/01/02 15:04",
NewLine: true,
Printer: pio.NewPrinter("", os.Stdout).EnableDirectOutput().Hijack(logHijacker),
children: newLoggerMap(),
}
}
// acquireLog returns a new log fom the pool.
func (l *Logger) acquireLog(level Level, msg string, withPrintln bool) *Log {
log, ok := l.logs.Get().(*Log)
if !ok {
log = &Log{
Logger: l,
}
}
log.NewLine = withPrintln
log.Time = time.Now()
log.Level = level
log.Message = msg
return log
}
// releaseLog Log releases a log instance back to the pool.
func (l *Logger) releaseLog(log *Log) {
l.logs.Put(log)
}
// we could use marshal inside Log but we don't have access to printer,
// we could also use the .Handle with NopOutput too but
// this way is faster:
var logHijacker = func(ctx *pio.Ctx) {
l, ok := ctx.Value.(*Log)
if !ok {
ctx.Next()
return
}
line := GetTextForLevel(l.Level, ctx.Printer.IsTerminal)
if line != "" {
line += " "
}
if t := l.FormatTime(); t != "" {
line += t + " "
}
line += l.Message
var b []byte
if pref := l.Logger.Prefix; len(pref) > 0 {
b = append(pref, []byte(line)...)
} else {
b = []byte(line)
}
ctx.Store(b, nil)
ctx.Next()
}
// NopOutput disables the output.
var NopOutput = pio.NopOutput()
// SetOutput overrides the Logger's Printer's Output with another `io.Writer`.
//
// Returns itself.
func (l *Logger) SetOutput(w io.Writer) *Logger {
l.Printer.SetOutput(w)
return l
}
// AddOutput adds one or more `io.Writer` to the Logger's Printer.
//
// If one of the "writers" is not a terminal-based (i.e File)
// then colors will be disabled for all outputs.
//
// Returns itself.
func (l *Logger) AddOutput(writers ...io.Writer) *Logger {
l.Printer.AddOutput(writers...)
return l
}
// SetPrefix sets a prefix for this "l" Logger.
//
// The prefix is the first space-separated
// word that is being presented to the output.
// It's written even before the log level text.
//
// Returns itself.
func (l *Logger) SetPrefix(s string) *Logger {
l.mu.Lock()
l.Prefix = []byte(s)
l.mu.Unlock()
return l
}
// SetTimeFormat sets time format for logs,
// if "s" is empty then time representation will be off.
//
// Returns itself.
func (l *Logger) SetTimeFormat(s string) *Logger {
l.mu.Lock()
l.TimeFormat = s
l.mu.Unlock()
return l
}
// DisableNewLine disables the new line suffix on every log function, even the `F`'s,
// the caller should add "\n" to the log message manually after this call.
//
// Returns itself.
func (l *Logger) DisableNewLine() *Logger {
l.mu.Lock()
l.NewLine = false
l.mu.Unlock()
return l
}
// SetLevel accepts a string representation of
// a `Level` and returns a `Level` value based on that "levelName".
//
// Available level names are:
// "disable"
// "fatal"
// "error"
// "warn"
// "info"
// "debug"
//
// Alternatively you can use the exported `Level` field, i.e `Level = golog.ErrorLevel`
//
// Returns itself.
func (l *Logger) SetLevel(levelName string) *Logger {
l.mu.Lock()
l.Level = fromLevelName(levelName)
l.mu.Unlock()
return l
}
func (l *Logger) print(level Level, msg string, newLine bool) {
if l.Level >= level {
// newLine passed here in order for handler to know
// if this message derives from Println and Leveled functions
// or by simply, Print.
log := l.acquireLog(level, msg, newLine)
// if not handled by one of the handler
// then print it as usual.
if !l.handled(log) {
if newLine {
l.Printer.Println(log)
} else {
l.Printer.Print(log)
}
}
l.releaseLog(log)
}
// if level was fatal we don't care about the logger's level, we'll exit.
if level == FatalLevel {
os.Exit(1)
}
}
// Print prints a log message without levels and colors.
func (l *Logger) Print(v ...interface{}) {
l.print(DisableLevel, fmt.Sprint(v...), l.NewLine)
}
// Printf formats according to a format specifier and writes to `Printer#Output` without levels and colors.
func (l *Logger) Printf(format string, args ...interface{}) {
l.print(DisableLevel, fmt.Sprintf(format, args...), l.NewLine)
}
// Println prints a log message without levels and colors.
// It adds a new line at the end, it overrides the `NewLine` option.
func (l *Logger) Println(v ...interface{}) {
l.print(DisableLevel, fmt.Sprint(v...), true)
}
// Log prints a leveled log message to the output.
// This method can be used to use custom log levels if needed.
// It adds a new line in the end.
func (l *Logger) Log(level Level, v ...interface{}) {
l.print(level, fmt.Sprint(v...), l.NewLine)
}
// Logf prints a leveled log message to the output.
// This method can be used to use custom log levels if needed.
// It adds a new line in the end.
func (l *Logger) Logf(level Level, format string, args ...interface{}) {
msg := fmt.Sprintf(format, args...)
l.Log(level, msg)
}
// Fatal `os.Exit(1)` exit no matter the level of the logger.
// If the logger's level is fatal, error, warn, info or debug
// then it will print the log message too.
func (l *Logger) Fatal(v ...interface{}) {
l.Log(FatalLevel, v...)
}
// Fatalf will `os.Exit(1)` no matter the level of the logger.
// If the logger's level is fatal, error, warn, info or debug
// then it will print the log message too.
func (l *Logger) Fatalf(format string, args ...interface{}) {
msg := fmt.Sprintf(format, args...)
l.Fatal(msg)
}
// Error will print only when logger's Level is error, warn, info or debug.
func (l *Logger) Error(v ...interface{}) {
l.Log(ErrorLevel, v...)
}
// Errorf will print only when logger's Level is error, warn, info or debug.
func (l *Logger) Errorf(format string, args ...interface{}) {
msg := fmt.Sprintf(format, args...)
l.Error(msg)
}
// Warn will print when logger's Level is warn, info or debug.
func (l *Logger) Warn(v ...interface{}) {
l.Log(WarnLevel, v...)
}
// Warnf will print when logger's Level is warn, info or debug.
func (l *Logger) Warnf(format string, args ...interface{}) {
msg := fmt.Sprintf(format, args...)
l.Warn(msg)
}
// Info will print when logger's Level is info or debug.
func (l *Logger) Info(v ...interface{}) {
l.Log(InfoLevel, v...)
}
// Infof will print when logger's Level is info or debug.
func (l *Logger) Infof(format string, args ...interface{}) {
msg := fmt.Sprintf(format, args...)
l.Info(msg)
}
// Debug will print when logger's Level is debug.
func (l *Logger) Debug(v ...interface{}) {
l.Log(DebugLevel, v...)
}
// Debugf will print when logger's Level is debug.
func (l *Logger) Debugf(format string, args ...interface{}) {
// On debug mode don't even try to fmt.Sprintf if it's not required,
// this can be used to allow `Debugf` to be called without even the `fmt.Sprintf`'s
// performance cost if the logger doesn't allow debug logging.
if l.Level >= DebugLevel {
msg := fmt.Sprintf(format, args...)
l.Debug(msg)
}
}
// Install receives an external logger
// and automatically adapts its print functions.
//
// Install adds a golog handler to support third-party integrations,
// it can be used only once per `golog#Logger` instance.
//
// For example, if you want to print using a logrus
// logger you can do the following:
// `Install(logrus.StandardLogger())`
//
// Look `golog#Logger.Handle` for more.
func (l *Logger) Install(logger ExternalLogger) {
l.Handle(integrateExternalLogger(logger))
}
// InstallStd receives a standard logger
// and automatically adapts its print functions.
//
// Install adds a golog handler to support third-party integrations,
// it can be used only once per `golog#Logger` instance.
//
// Example Code:
//
// import "log"
// myLogger := log.New(os.Stdout, "", 0)
// InstallStd(myLogger)
//
// Look `golog#Logger.Handle` for more.
func (l *Logger) InstallStd(logger StdLogger) {
l.Handle(integrateStdLogger(logger))
}
// Handle adds a log handler.
//
// Handlers can be used to intercept the message between a log value
// and the actual print operation, it's called
// when one of the print functions called.
// If it's return value is true then it means that the specific
// handler handled the log by itself therefore no need to
// proceed with the default behavior of printing the log
// to the specified logger's output.
//
// It stops on the handler which returns true firstly.
// The `Log` value holds the level of the print operation as well.
func (l *Logger) Handle(handler Handler) {
l.mu.Lock()
l.handlers = append(l.handlers, handler)
l.mu.Unlock()
}
func (l *Logger) handled(value *Log) (handled bool) {
for _, h := range l.handlers {
if h(value) {
return true
}
}
return false
}
// Hijack adds a hijacker to the low-level logger's Printer.
// If you need to implement such as a low-level hijacker manually,
// then you have to make use of the pio library.
func (l *Logger) Hijack(hijacker func(ctx *pio.Ctx)) {
l.Printer.Hijack(hijacker)
}
// Scan scans everything from "r" and prints
// its new contents to the logger's Printer's Output,
// forever or until the returning "cancel" is fired, once.
func (l *Logger) Scan(r io.Reader) (cancel func()) {
l.once.Do(func() {
// add a marshaler once
// in order to handle []byte and string
// as its input.
// Because scan doesn't care about
// logging levels (because of the io.Reader)
// Note: We don't use the `pio.Text` built'n marshaler
// because we want to manage time log too.
l.Printer.MarshalFunc(func(v interface{}) ([]byte, error) {
var line []byte
if b, ok := v.([]byte); ok {
line = b
} else if s, ok := v.(string); ok {
line = []byte(s)
}
if len(line) == 0 {
return nil, pio.ErrMarshalNotResponsible
}
formattedTime := time.Now().Format(l.TimeFormat)
if formattedTime != "" {
line = append([]byte(formattedTime+" "), line...)
}
return line, nil
})
})
return l.Printer.Scan(r, true)
}
// Clone returns a copy of this "l" Logger.
// This copy is returned as pointer as well.
func (l *Logger) Clone() *Logger {
return &Logger{
Prefix: l.Prefix,
Level: l.Level,
TimeFormat: l.TimeFormat,
Printer: l.Printer,
handlers: l.handlers,
children: newLoggerMap(),
mu: sync.Mutex{},
once: sync.Once{},
}
}
// Child (creates if not exists and) returns a new child
// Logger based on the "l"'s fields.
//
// Can be used to separate logs by category.
func (l *Logger) Child(name string) *Logger {
return l.children.getOrAdd(name, l)
}
type loggerMap struct {
mu sync.RWMutex
Items map[string]*Logger
}
func newLoggerMap() *loggerMap {
return &loggerMap{
Items: make(map[string]*Logger),
}
}
func (m *loggerMap) getOrAdd(name string, parent *Logger) *Logger {
m.mu.RLock()
logger, ok := m.Items[name]
m.mu.RUnlock()
if ok {
return logger
}
logger = parent.Clone()
prefix := name
// if prefix doesn't end with a whitespace, then add it here.
if lb := name[len(prefix)-1]; lb != ' ' {
prefix += ": "
}
logger.SetPrefix(prefix)
m.mu.Lock()
m.Items[name] = logger
m.mu.Unlock()
return logger
}