logrus

package
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 Go to latest Published: Jan 8, 2018 License: Apache-2.0, MIT Imports: 14 Imported by: 0

Documentation

Overview

Package logrus is a structured logger for Go, completely API compatible with the standard library logger.

The simplest way to use Logrus is simply the package-level exported logger: 

package main

import (
  log "github.com/Sirupsen/logrus"
)

func main() {
  log.WithFields(log.Fields{
    "animal": "walrus",
    "number": 1,
    "size":   10,
  }).Info("A walrus appears")
}

Output: 

time="2015-09-07T08:48:33Z" level=info msg="A walrus appears" animal=walrus number=1 size=10

For a full guide visit https://github.com/Sirupsen/logrus

Index

Constants

View Source 
const (
	FieldKeyMsg   = "msg"
	FieldKeyLevel = "level"
	FieldKeyTime  = "time"
)
View Source 
const DefaultTimestampFormat = time.RFC3339

Variables

View Source 
var AllLevels = []Level{
	PanicLevel,
	FatalLevel,
	ErrorLevel,
	WarnLevel,
	InfoLevel,
	DebugLevel,
}

A constant exposing all logging levels

View Source 
var ErrorKey = "error"

Defines the key when adding errors using WithError.

Functions

func AddHook 

func AddHook(hook Hook)

AddHook adds a hook to the standard logger hooks.

func Debug 

func Debug(args ...interface{})

Debug logs a message at level Debug on the standard logger.

func Debugf 

func Debugf(format string, args ...interface{})

Debugf logs a message at level Debug on the standard logger.

func Debugln 

func Debugln(args ...interface{})

Debugln logs a message at level Debug on the standard logger.

func Error 

func Error(args ...interface{})

Error logs a message at level Error on the standard logger.

func Errorf 

func Errorf(format string, args ...interface{})

Errorf logs a message at level Error on the standard logger.

func Errorln 

func Errorln(args ...interface{})

Errorln logs a message at level Error on the standard logger.

func Exit 

func Exit(code int)

Exit runs all the Logrus atexit handlers and then terminates the program using os.Exit(code)

func Fatal 

func Fatal(args ...interface{})

Fatal logs a message at level Fatal on the standard logger.

func Fatalf 

func Fatalf(format string, args ...interface{})

Fatalf logs a message at level Fatal on the standard logger.

func Fatalln 

func Fatalln(args ...interface{})

Fatalln logs a message at level Fatal on the standard logger.

func Info 

func Info(args ...interface{})

Info logs a message at level Info on the standard logger.

func Infof 

func Infof(format string, args ...interface{})

Infof logs a message at level Info on the standard logger.

func Infoln 

func Infoln(args ...interface{})

Infoln logs a message at level Info on the standard logger.

func IsTerminal 

func IsTerminal(f io.Writer) bool

IsTerminal returns true if stderr's file descriptor is a terminal.

func Panic 

func Panic(args ...interface{})

Panic logs a message at level Panic on the standard logger.

func Panicf 

func Panicf(format string, args ...interface{})

Panicf logs a message at level Panic on the standard logger.

func Panicln 

func Panicln(args ...interface{})

Panicln logs a message at level Panic on the standard logger.

func Print 

func Print(args ...interface{})

Print logs a message at level Info on the standard logger.

func Printf 

func Printf(format string, args ...interface{})

Printf logs a message at level Info on the standard logger.

func Println 

func Println(args ...interface{})

Println logs a message at level Info on the standard logger.

func RegisterExitHandler 

func RegisterExitHandler(handler func())

RegisterExitHandler adds a Logrus Exit handler, call logrus.Exit to invoke all handlers. The handlers will also be invoked when any Fatal log entry is made.

This method is useful when a caller wishes to use logrus to log a fatal message but also needs to gracefully shutdown. An example usecase could be closing database connections, or sending a alert that the application is closing.

func SetFormatter 

func SetFormatter(formatter Formatter)

SetFormatter sets the standard logger formatter.

func SetLevel 

func SetLevel(level Level)

SetLevel sets the standard logger level.

func SetOutput 

func SetOutput(out io.Writer)

SetOutput sets the standard logger output.

func Warn 

func Warn(args ...interface{})

Warn logs a message at level Warn on the standard logger.

func Warnf 

func Warnf(format string, args ...interface{})

Warnf logs a message at level Warn on the standard logger.

func Warning 

func Warning(args ...interface{})

Warning logs a message at level Warn on the standard logger.

func Warningf 

func Warningf(format string, args ...interface{})

Warningf logs a message at level Warn on the standard logger.

func Warningln 

func Warningln(args ...interface{})

Warningln logs a message at level Warn on the standard logger.

func Warnln 

func Warnln(args ...interface{})

Warnln logs a message at level Warn on the standard logger.

Types

type Entry 

type Entry struct {
	Logger *Logger

	// Contains all the fields set by the user.
	Data Fields

	// Time at which the log entry was created
	Time time.Time

	// Level the log entry was logged at: Debug, Info, Warn, Error, Fatal or Panic
	Level Level

	// Message passed to Debug, Info, Warn, Error, Fatal or Panic
	Message string

	// When formatter is called in entry.log(), an Buffer may be set to entry
	Buffer *bytes.Buffer
}

An entry is the final or intermediate Logrus logging entry. It contains all the fields passed with WithField{,s}. It's finally logged when Debug, Info, Warn, Error, Fatal or Panic is called on it. These objects can be reused and passed around as much as you wish to avoid field duplication.

func NewEntry 

func NewEntry(logger *Logger) *Entry

func WithError 

func WithError(err error) *Entry

WithError creates an entry from the standard logger and adds an error to it, using the value defined in ErrorKey as key.

func WithField 

func WithField(key string, value interface{}) *Entry

WithField creates an entry from the standard logger and adds a field to it. If you want multiple fields, use `WithFields`.

Note that it doesn't log until you call Debug, Print, Info, Warn, Fatal or Panic on the Entry it returns.

func WithFields 

func WithFields(fields Fields) *Entry

WithFields creates an entry from the standard logger and adds multiple fields to it. This is simply a helper for `WithField`, invoking it once for each field.

Note that it doesn't log until you call Debug, Print, Info, Warn, Fatal or Panic on the Entry it returns.

func (*Entry) Debug 

func (entry *Entry) Debug(args ...interface{})

func (*Entry) Debugf 

func (entry *Entry) Debugf(format string, args ...interface{})

func (*Entry) Debugln 

func (entry *Entry) Debugln(args ...interface{})

func (*Entry) Error 

func (entry *Entry) Error(args ...interface{})

func (*Entry) Errorf 

func (entry *Entry) Errorf(format string, args ...interface{})

func (*Entry) Errorln 

func (entry *Entry) Errorln(args ...interface{})

func (*Entry) Fatal 

func (entry *Entry) Fatal(args ...interface{})

func (*Entry) Fatalf 

func (entry *Entry) Fatalf(format string, args ...interface{})

func (*Entry) Fatalln 

func (entry *Entry) Fatalln(args ...interface{})

func (*Entry) Info 

func (entry *Entry) Info(args ...interface{})

func (*Entry) Infof 

func (entry *Entry) Infof(format string, args ...interface{})

func (*Entry) Infoln 

func (entry *Entry) Infoln(args ...interface{})

func (*Entry) Panic 

func (entry *Entry) Panic(args ...interface{})

func (*Entry) Panicf 

func (entry *Entry) Panicf(format string, args ...interface{})

func (*Entry) Panicln 

func (entry *Entry) Panicln(args ...interface{})

func (*Entry) Print 

func (entry *Entry) Print(args ...interface{})

func (*Entry) Printf 

func (entry *Entry) Printf(format string, args ...interface{})

func (*Entry) Println 

func (entry *Entry) Println(args ...interface{})

func (*Entry) String 

func (entry *Entry) String() (string, error)

Returns the string representation from the reader and ultimately the formatter.

func (*Entry) Warn 

func (entry *Entry) Warn(args ...interface{})

func (*Entry) Warnf 

func (entry *Entry) Warnf(format string, args ...interface{})

func (*Entry) Warning 

func (entry *Entry) Warning(args ...interface{})

func (*Entry) Warningf 

func (entry *Entry) Warningf(format string, args ...interface{})

func (*Entry) Warningln 

func (entry *Entry) Warningln(args ...interface{})

func (*Entry) Warnln 

func (entry *Entry) Warnln(args ...interface{})

func (*Entry) WithError 

func (entry *Entry) WithError(err error) *Entry

Add an error as single field (using the key defined in ErrorKey) to the Entry.

func (*Entry) WithField 

func (entry *Entry) WithField(key string, value interface{}) *Entry

Add a single field to the Entry.

func (*Entry) WithFields 

func (entry *Entry) WithFields(fields Fields) *Entry

Add a map of fields to the Entry.

func (*Entry) Writer 

func (entry *Entry) Writer() *io.PipeWriter

func (*Entry) WriterLevel 

func (entry *Entry) WriterLevel(level Level) *io.PipeWriter

type FieldLogger 

type FieldLogger interface {
	WithField(key string, value interface{}) *Entry
	WithFields(fields Fields) *Entry
	WithError(err error) *Entry

	Debugf(format string, args ...interface{})
	Infof(format string, args ...interface{})
	Printf(format string, args ...interface{})
	Warnf(format string, args ...interface{})
	Warningf(format string, args ...interface{})
	Errorf(format string, args ...interface{})
	Fatalf(format string, args ...interface{})
	Panicf(format string, args ...interface{})

	Debug(args ...interface{})
	Info(args ...interface{})
	Print(args ...interface{})
	Warn(args ...interface{})
	Warning(args ...interface{})
	Error(args ...interface{})
	Fatal(args ...interface{})
	Panic(args ...interface{})

	Debugln(args ...interface{})
	Infoln(args ...interface{})
	Println(args ...interface{})
	Warnln(args ...interface{})
	Warningln(args ...interface{})
	Errorln(args ...interface{})
	Fatalln(args ...interface{})
	Panicln(args ...interface{})
}

The FieldLogger interface generalizes the Entry and Logger types

type FieldMap 

type FieldMap map[fieldKey]string

type Fields 

type Fields map[string]interface{}

Fields type, used to pass to `WithFields`.

type Formatter 

type Formatter interface {
	Format(*Entry) ([]byte, error)
}

The Formatter interface is used to implement a custom Formatter. It takes an `Entry`. It exposes all the fields, including the default ones:

* `entry.Data["msg"]`. The message passed from Info, Warn, Error .. * `entry.Data["time"]`. The timestamp. * `entry.Data["level"]. The level the entry was logged at.

Any additional fields added with `WithField` or `WithFields` are also in `entry.Data`. Format is expected to return an array of bytes which are then logged to `logger.Out`.

type Hook 

type Hook interface {
	Levels() []Level
	Fire(*Entry) error
}

A hook to be fired when logging on the logging levels returned from `Levels()` on your implementation of the interface. Note that this is not fired in a goroutine or a channel with workers, you should handle such functionality yourself if your call is non-blocking and you don't wish for the logging calls for levels returned from `Levels()` to block.

type JSONFormatter 

type JSONFormatter struct {
	// TimestampFormat sets the format used for marshaling timestamps.
	TimestampFormat string

	// DisableTimestamp allows disabling automatic timestamps in output
	DisableTimestamp bool

	// FieldMap allows users to customize the names of keys for various fields.
	// As an example:
	// formatter := &JSONFormatter{
	//   	FieldMap: FieldMap{
	// 		 FieldKeyTime: "@timestamp",
	// 		 FieldKeyLevel: "@level",
	// 		 FieldKeyLevel: "@message",
	//    },
	// }
	FieldMap FieldMap
}

func (*JSONFormatter) Format 

func (f *JSONFormatter) Format(entry *Entry) ([]byte, error)

type Level 

type Level uint8

Level type 

const (
	// PanicLevel level, highest level of severity. Logs and then calls panic with the
	// message passed to Debug, Info, ...
	PanicLevel Level = iota
	// FatalLevel level. Logs and then calls `os.Exit(1)`. It will exit even if the
	// logging level is set to Panic.
	FatalLevel
	// ErrorLevel level. Logs. Used for errors that should definitely be noted.
	// Commonly used for hooks to send errors to an error tracking service.
	ErrorLevel
	// WarnLevel level. Non-critical entries that deserve eyes.
	WarnLevel
	// InfoLevel level. General operational entries about what's going on inside the
	// application.
	InfoLevel
	// DebugLevel level. Usually only enabled when debugging. Very verbose logging.
	DebugLevel
)

These are the different logging levels. You can set the logging level to log on your instance of logger, obtained with `logrus.New()`.

func GetLevel 

func GetLevel() Level

GetLevel returns the standard logger level.

func ParseLevel 

func ParseLevel(lvl string) (Level, error)

ParseLevel takes a string level and returns the Logrus log level constant.

func (Level) String 

func (level Level) String() string

Convert the Level to a string. E.g. PanicLevel becomes "panic".

type LevelHooks 

type LevelHooks map[Level][]Hook

Internal type for storing the hooks on a logger instance.

func (LevelHooks) Add 

func (hooks LevelHooks) Add(hook Hook)

Add a hook to an instance of logger. This is called with `log.Hooks.Add(new(MyHook))` where `MyHook` implements the `Hook` interface.

func (LevelHooks) Fire 

func (hooks LevelHooks) Fire(level Level, entry *Entry) error

Fire all the hooks for the passed level. Used by `entry.log` to fire appropriate hooks for a log entry.

type Logger 

type Logger struct {
	// The logs are `io.Copy`'d to this in a mutex. It's common to set this to a
	// file, or leave it default which is `os.Stderr`. You can also set this to
	// something more adventorous, such as logging to Kafka.
	Out io.Writer
	// Hooks for the logger instance. These allow firing events based on logging
	// levels and log entries. For example, to send errors to an error tracking
	// service, log to StatsD or dump the core on fatal errors.
	Hooks LevelHooks
	// All log entries pass through the formatter before logged to Out. The
	// included formatters are `TextFormatter` and `JSONFormatter` for which
	// TextFormatter is the default. In development (when a TTY is attached) it
	// logs with colors, but to a file it wouldn't. You can easily implement your
	// own that implements the `Formatter` interface, see the `README` or included
	// formatters for examples.
	Formatter Formatter
	// The logging level the logger should log at. This is typically (and defaults
	// to) `logrus.Info`, which allows Info(), Warn(), Error() and Fatal() to be
	// logged. `logrus.Debug` is useful in
	Level Level
	// contains filtered or unexported fields
}

func New 

func New() *Logger

Creates a new logger. Configuration should be set by changing `Formatter`, `Out` and `Hooks` directly on the default logger instance. You can also just instantiate your own: 

var log = &Logger{
  Out: os.Stderr,
  Formatter: new(JSONFormatter),
  Hooks: make(LevelHooks),
  Level: logrus.DebugLevel,
}

It's recommended to make this a global instance called `log`.

func StandardLogger 

func StandardLogger() *Logger

func (*Logger) Debug 

func (logger *Logger) Debug(args ...interface{})

func (*Logger) Debugf 

func (logger *Logger) Debugf(format string, args ...interface{})

func (*Logger) Debugln 

func (logger *Logger) Debugln(args ...interface{})

func (*Logger) Error 

func (logger *Logger) Error(args ...interface{})

func (*Logger) Errorf 

func (logger *Logger) Errorf(format string, args ...interface{})

func (*Logger) Errorln 

func (logger *Logger) Errorln(args ...interface{})

func (*Logger) Fatal 

func (logger *Logger) Fatal(args ...interface{})

func (*Logger) Fatalf 

func (logger *Logger) Fatalf(format string, args ...interface{})

func (*Logger) Fatalln 

func (logger *Logger) Fatalln(args ...interface{})

func (*Logger) Info 

func (logger *Logger) Info(args ...interface{})

func (*Logger) Infof 

func (logger *Logger) Infof(format string, args ...interface{})

func (*Logger) Infoln 

func (logger *Logger) Infoln(args ...interface{})

func (*Logger) Panic 

func (logger *Logger) Panic(args ...interface{})

func (*Logger) Panicf 

func (logger *Logger) Panicf(format string, args ...interface{})

func (*Logger) Panicln 

func (logger *Logger) Panicln(args ...interface{})

func (*Logger) Print 

func (logger *Logger) Print(args ...interface{})

func (*Logger) Printf 

func (logger *Logger) Printf(format string, args ...interface{})

func (*Logger) Println 

func (logger *Logger) Println(args ...interface{})

func (*Logger) SetNoLock 

func (logger *Logger) SetNoLock()

When file is opened with appending mode, it's safe to write concurrently to a file (within 4k message on Linux). In these cases user can choose to disable the lock.

func (*Logger) Warn 

func (logger *Logger) Warn(args ...interface{})

func (*Logger) Warnf 

func (logger *Logger) Warnf(format string, args ...interface{})

func (*Logger) Warning 

func (logger *Logger) Warning(args ...interface{})

func (*Logger) Warningf 

func (logger *Logger) Warningf(format string, args ...interface{})

func (*Logger) Warningln 

func (logger *Logger) Warningln(args ...interface{})

func (*Logger) Warnln 

func (logger *Logger) Warnln(args ...interface{})

func (*Logger) WithError 

func (logger *Logger) WithError(err error) *Entry

Add an error as single field to the log entry. All it does is call `WithError` for the given `error`.

func (*Logger) WithField 

func (logger *Logger) WithField(key string, value interface{}) *Entry

Adds a field to the log entry, note that it doesn't log until you call Debug, Print, Info, Warn, Fatal or Panic. It only creates a log entry. If you want multiple fields, use `WithFields`.

func (*Logger) WithFields 

func (logger *Logger) WithFields(fields Fields) *Entry

Adds a struct of fields to the log entry. All it does is call `WithField` for each `Field`.

func (*Logger) Writer 

func (logger *Logger) Writer() *io.PipeWriter

func (*Logger) WriterLevel 

func (logger *Logger) WriterLevel(level Level) *io.PipeWriter

type MutexWrap 

type MutexWrap struct {
	// contains filtered or unexported fields
}

func (*MutexWrap) Disable 

func (mw *MutexWrap) Disable()

func (*MutexWrap) Lock 

func (mw *MutexWrap) Lock()

func (*MutexWrap) Unlock 

func (mw *MutexWrap) Unlock()

type StdLogger 

type StdLogger interface {
	Print(...interface{})
	Printf(string, ...interface{})
	Println(...interface{})

	Fatal(...interface{})
	Fatalf(string, ...interface{})
	Fatalln(...interface{})

	Panic(...interface{})
	Panicf(string, ...interface{})
	Panicln(...interface{})
}

StdLogger is what your logrus-enabled library should take, that way it'll accept a stdlib logger and a logrus logger. There's no standard interface, this is the closest we get, unfortunately.

type Termios 

type Termios syscall.Termios

type TextFormatter 

type TextFormatter struct {
	// Set to true to bypass checking for a TTY before outputting colors.
	ForceColors bool

	// Force disabling colors.
	DisableColors bool

	// Disable timestamp logging. useful when output is redirected to logging
	// system that already adds timestamps.
	DisableTimestamp bool

	// Enable logging the full timestamp when a TTY is attached instead of just
	// the time passed since beginning of execution.
	FullTimestamp bool

	// TimestampFormat to use for display when a full timestamp is printed
	TimestampFormat string

	// The fields are sorted by default for a consistent output. For applications
	// that log extremely frequently and don't use the JSON formatter this may not
	// be desired.
	DisableSorting bool

	// QuoteEmptyFields will wrap empty fields in quotes if true
	QuoteEmptyFields bool

	// QuoteCharacter can be set to the override the default quoting character "
	// with something else. For example: ', or `.
	QuoteCharacter string

	sync.Once
	// contains filtered or unexported fields
}

func (*TextFormatter) Format 

func (f *TextFormatter) Format(entry *Entry) ([]byte, error)

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