log

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 Go to latest Published: Feb 7, 2025 License: GPL-3.0, MIT Imports: 15 Imported by: 0

Documentation

Overview

Package log is is imported from https://github.com/sirupsen/logrus

Index

Constants

View Source 
const (
	FieldKeyMsg   = "msg"
	FieldKeyLevel = "level"
	FieldKeyTime  = "time"
	FieldKeyFunc  = "func"
	FieldKeyFile  = "file"
)

Default key names for the default fields.

Variables

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

A constant exposing all logging levels

View Source 
var ErrorKey = "error"

Defines the key when adding errors using WithError.

View Source 
var LogPrefix = ""

LogPrefix is a fixed string printed at the beginning of each line with DaemonFormatter. Set it as a build time variable to help debug the program.

Functions

func Debugf 

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

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

func Errorf 

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

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

func Fatal 

func Fatal(args ...interface{})

Fatal logs a message at level Fatal on the standard logger then the process will exit with status set to 1.

func Fatalf 

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

Fatalf logs a message at level Fatal on the standard logger then the process will exit with status set to 1.

func Fatalln 

func Fatalln(args ...interface{})

Fatalln logs a message at level Fatal on the standard logger then the process will exit with status set to 1.

func Infof 

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

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

func IsLevelEnabled 

func IsLevelEnabled(level Level) bool

IsLevelEnabled checks if the log level of the standard logger is greater than the level param

func NewClientLogFile 

func NewClientLogFile() (io.WriteCloser, error)

NewClientLogFile returns a file handler for mieru client to write logs.

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 RemoveOldClientLogFiles 

func RemoveOldClientLogFiles() error

RemoveOldClientLogFiles deletes the oldest client log files.

func SetBufferPool 

func SetBufferPool(bp BufferPool)

func SetFormatter 

func SetFormatter(formatter Formatter)

SetFormatter sets the standard logger formatter.

func SetLevel 

func SetLevel(level string)

SetLevel sets the standard logger level.

func SetOutput 

func SetOutput(out io.Writer)

SetOutput sets the standard logger output.

func SetOutputToTest 

func SetOutputToTest(t *testing.T)

SetOutputToTest prints logs to the go test.

func SetReportCaller 

func SetReportCaller(include bool)

SetReportCaller sets whether the standard logger will include the calling method as a field.

func Tracef 

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

Tracef logs a message at level Trace on the standard logger.

func Warnf 

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

Warnf 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.

Types

type BufferPool 

type BufferPool interface {
	Put(*bytes.Buffer)
	Get() *bytes.Buffer
}

type CliFormatter 

type CliFormatter struct{}

CliFormatter is a log formatter that works best for command output. It doesn't print log prefix, time, level, or field data.

func (*CliFormatter) Format 

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

type DaemonFormatter 

type DaemonFormatter struct {
	NoTimestamp bool
}

DaemonFormatter is the a log formatter that is suitable for daemon. FATAL log is also printed to stderr.

func (*DaemonFormatter) Format 

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

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: Trace, Debug, Info, Warn, Error, Fatal or Panic
	// This field will be set on entry firing and the value will be equal to the one in Logger struct field.
	Level Level

	// Calling method, with package name
	Caller *runtime.Frame

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

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

	// Contains the context set by the user. Useful for hook processing etc.
	Context context.Context
	// contains filtered or unexported fields
}

An entry is the final or intermediate Logrus logging entry. It contains all the fields passed with WithField{,s}. It's finally logged when Trace, 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 WithContext 

func WithContext(ctx context.Context) *Entry

WithContext creates an entry from the standard logger and adds a context to it.

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 WithTime 

func WithTime(t time.Time) *Entry

WithTime creates an entry from the standard logger and overrides the time of logs generated with it.

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

func (*Entry) Bytes 

func (entry *Entry) Bytes() ([]byte, error)

Returns the bytes representation of this entry from the formatter.

func (*Entry) Debugf 

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

func (*Entry) Dup 

func (entry *Entry) Dup() *Entry

func (*Entry) Errorf 

func (entry *Entry) Errorf(format string, 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) HasCaller 

func (entry Entry) HasCaller() (has bool)

func (*Entry) Infof 

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

func (*Entry) Log 

func (entry *Entry) Log(level Level, args ...interface{})

func (*Entry) Logf 

func (entry *Entry) Logf(level Level, format string, args ...interface{})

func (*Entry) Logln 

func (entry *Entry) Logln(level Level, 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) Tracef 

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

func (*Entry) Warnf 

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

func (*Entry) Warningf 

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

func (*Entry) WithContext 

func (entry *Entry) WithContext(ctx context.Context) *Entry

Add a context to the Entry.

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) WithTime 

func (entry *Entry) WithTime(t time.Time) *Entry

Overrides the time of the Entry.

type FieldLogger 

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

	Tracef(format string, args ...interface{})
	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{})

	Print(args ...interface{})
	Fatal(args ...interface{})
	Panic(args ...interface{})

	Println(args ...interface{})
	Fatalln(args ...interface{})
	Panicln(args ...interface{})
}

The FieldLogger interface generalizes the Entry and Logger types

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 Level 

type Level uint32

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 `logger.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
	// TraceLevel level. Designates finer-grained informational events than the Debug.
	TraceLevel
)

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) MarshalText 

func (level Level) MarshalText() ([]byte, error)

func (Level) String 

func (level Level) String() string

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

func (*Level) UnmarshalText 

func (level *Level) UnmarshalText(text []byte) error

UnmarshalText implements encoding.TextUnmarshaler.

type LogFunction 

type LogFunction func() []interface{}

LogFunction For big messages, it can be more efficient to pass a function and only call it if the log level is actually enables rather than generating the log message and then checking if the level is enabled

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 adventurous, such as logging to Kafka.
	Out io.Writer

	// 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

	// Flag for whether to log caller info (off by default)
	ReportCaller bool

	// 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.
	Level Level

	// Function to exit the application, defaults to `os.Exit()`
	ExitFunc exitFunc

	// The buffer pool used to format the log. If it is nil, the default global
	// buffer pool will be used.
	BufferPool BufferPool
	// contains filtered or unexported fields
}

func New 

func New() *Logger

Creates a new logger with default configuration.

func StandardLogger 

func StandardLogger() *Logger

func (*Logger) Debugf 

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

func (*Logger) Errorf 

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

func (*Logger) Exit 

func (logger *Logger) Exit(code int)

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) GetLevel 

func (logger *Logger) GetLevel() Level

GetLevel returns the logger level.

func (*Logger) Infof 

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

func (*Logger) IsLevelEnabled 

func (logger *Logger) IsLevelEnabled(level Level) bool

IsLevelEnabled checks if the log level of the logger is greater than the level param

func (*Logger) Log 

func (logger *Logger) Log(level Level, args ...interface{})

func (*Logger) Logf 

func (logger *Logger) Logf(level Level, format string, args ...interface{})

func (*Logger) Logln 

func (logger *Logger) Logln(level Level, 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) SetBufferPool 

func (logger *Logger) SetBufferPool(pool BufferPool)

SetBufferPool sets the logger buffer pool.

func (*Logger) SetFormatter 

func (logger *Logger) SetFormatter(formatter Formatter)

SetFormatter sets the logger formatter.

func (*Logger) SetLevel 

func (logger *Logger) SetLevel(level Level)

SetLevel sets the logger level.

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) SetOutput 

func (logger *Logger) SetOutput(output io.Writer)

SetOutput sets the logger output.

func (*Logger) SetReportCaller 

func (logger *Logger) SetReportCaller(reportCaller bool)

func (*Logger) Tracef 

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

func (*Logger) Warnf 

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

func (*Logger) Warningf 

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

func (*Logger) WithContext 

func (logger *Logger) WithContext(ctx context.Context) *Entry

Add a context to the log entry.

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

WithField allocates a new entry and adds a field to it. Debug, Print, Info, Warn, Error, Fatal or Panic must be then applied to this new returned 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) WithTime 

func (logger *Logger) WithTime(t time.Time) *Entry

Overrides the time of the log entry.

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 NilFormatter 

type NilFormatter struct{}

NilFormatter prints no log. It disables logging.

func (*NilFormatter) Format 

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

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.

Source Files

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