internal

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 Go to latest Published: Nov 26, 2021 License: MIT Imports: 3 Imported by: 0

Documentation

Overview

Package internal of logger unifies different types of loggers into interfaces Logger. For example it allows to upgrade simple fmt.Printf to be a fully functional Logger. Therefore multiple wrappers are implemented here to provide different functions which could be missing in some loggers.

Package internal of logger unifies different types of loggers into interfaces Logger. For example it allows to upgrade simple fmt.Printf to be a fully functional Logger. Therefore multiple wrappers are implemented here to provide different functions which could be missing in some loggers.

Package internal of logger unifies different types of loggers into interfaces Logger. For example it allows to upgrade simple fmt.Printf to be a fully functional Logger. Therefore multiple wrappers are implemented here to provide different functions which could be missing in some loggers.

Package internal of logger unifies different types of loggers into interfaces Logger. For example it allows to upgrade simple fmt.Printf to be a fully functional Logger. Therefore multiple wrappers are implemented here to provide different functions which could be missing in some loggers.

Package internal of logger unifies different types of loggers into interfaces Logger. For example it allows to upgrade simple fmt.Printf to be a fully functional Logger. Therefore multiple wrappers are implemented here to provide different functions which could be missing in some loggers.

Package internal of logger unifies different types of loggers into interfaces Logger. For example it allows to upgrade simple fmt.Printf to be a fully functional Logger. Therefore multiple wrappers are implemented here to provide different functions which could be missing in some loggers.

Package internal of logger unifies different types of loggers into interfaces Logger. For example it allows to upgrade simple fmt.Printf to be a fully functional Logger. Therefore multiple wrappers are implemented here to provide different functions which could be missing in some loggers.

Package internal of logger unifies different types of loggers into interfaces Logger. For example it allows to upgrade simple fmt.Printf to be a fully functional Logger. Therefore multiple wrappers are implemented here to provide different functions which could be missing in some loggers.

Index

Constants

View Source 
const (
	// LevelUndefined is the erroneous value of log-level which corresponds
	// to zero-value.
	LevelUndefined = Level(iota)

	// LevelFatal will report about Fatalf-s only.
	LevelFatal

	// LevelPanic will report about Panicf-s and Fatalf-s only.
	LevelPanic

	// LevelError will report about Errorf-s, Panicf-s, ...
	LevelError

	// LevelWarning will report about Warningf-s, Errorf-s, ...
	LevelWarning

	// LevelInfo will report about Infof-s, Warningf-s, ...
	LevelInfo

	// LevelDebug will report about Debugf-s, Infof-s, ...
	LevelDebug
)

Variables

This section is empty.

Functions

func MinimalLoggerLogf 

func MinimalLoggerLogf(
	l MinimalLogger,
	level Level,
	format string,
	args ...interface{},
)

MinimalLoggerLogf is an implementation of method Logf (of interface MinimalLoggerCompact) based on MinimalLogger.

This function is implemented here to deduplicate code among logadapter-s.

Types

type DummyLogger 

type DummyLogger struct{}

DummyLogger is just a logger which does nothing. To do not duplicate anything we just implement MinimalLoggerCompact and the rest methods could be added using wrappers (see logger.ConvertLogger).

func (DummyLogger) Logf 

func (DummyLogger) Logf(_ Level, _ string, _ ...interface{})

Logf implements MinimalLoggerCompact.

type ExtendWrapper 

type ExtendWrapper struct {
	MinimalLogger
	Prefix   string
	CurLevel Level
}

ExtendWrapper implements Logger based on MinimalLogger.

Thus if you have only a MinimalLogger, you can extend it to a Logger using this wrapper.

It is called ExtendWrapper because it actually implements only LoggerExtensions.

func (ExtendWrapper) Debugf 

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

Debugf implements MinimalLogger.

It calls the backend ExtendWrapper.MinimalLogger.Debugf but also checks if the logging level is satisfied.

func (ExtendWrapper) Errorf 

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

Errorf implements MinimalLogger.

It calls the backend ExtendWrapper.MinimalLogger.Errorf but also checks if the logging level is satisfied.

func (ExtendWrapper) Fatalf 

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

Fatalf implements MinimalLogger.

It calls the backend ExtendWrapper.MinimalLogger.Fatalf but also checks if the logging level is satisfied.

func (ExtendWrapper) Infof 

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

Infof implements MinimalLogger.

It calls the backend ExtendWrapper.MinimalLogger.Infof but also checks if the logging level is satisfied.

func (ExtendWrapper) Level 

func (l ExtendWrapper) Level() Level

Level implements LoggerExtensions.

func (ExtendWrapper) OriginalLogger 

func (l ExtendWrapper) OriginalLogger() interface{}

OriginalLogger implements LoggerExtensions.

func (ExtendWrapper) Panicf 

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

Panicf implements MinimalLogger.

It calls the backend ExtendWrapper.MinimalLogger.Panicf but also checks if the logging level is satisfied.

func (ExtendWrapper) Warnf 

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

Warnf implements MinimalLogger.

It calls the backend ExtendWrapper.MinimalLogger.Warnf but also checks if the logging level is satisfied.

func (ExtendWrapper) WithField 

func (l ExtendWrapper) WithField(key string, value interface{}) Logger

WithField implements LoggerExtensions.

func (ExtendWrapper) WithFields 

func (l ExtendWrapper) WithFields(fields Fields) Logger

WithFields implements LoggerExtensions.

func (ExtendWrapper) WithLevel 

func (l ExtendWrapper) WithLevel(level Level) Logger

WithLevel implements LoggerExtensions.

type Fields 

type Fields = fields.Fields

Fields is a multiple of fields which are attached to logger/tracer messages.

type Level 

type Level int

Level is used to define severity of messages to be reported.

func ParseLogLevel 

func ParseLogLevel(in string) (Level, error)

ParseLogLevel parses incoming string into a Level and returns LevelUndefined with an error if an unknown logging level was passed.

func (*Level) Set 

func (logLevel *Level) Set(value string) error

Set updates the logging level values based on the passed string value. This method just implements flag.Value and pflag.Value.

func (Level) String 

func (logLevel Level) String() string

String just implements fmt.Stringer, flag.Value and pflag.Value.

func (*Level) Type 

func (logLevel *Level) Type() string

Type just implements pflag.Value.

type Logger 

type Logger interface {
	MinimalLogger
	LoggerExtensions
}

Logger is the interface of a logger provided by an extended context.

This is the complete logger with all the required methods/features.

func WrapMinimalLogger 

func WrapMinimalLogger(logger MinimalLogger) Logger

WrapMinimalLogger wraps a MinimalLogger to provide a Logger.

func WrapMinimalLoggerCompact 

func WrapMinimalLoggerCompact(logger MinimalLoggerCompact) Logger

WrapMinimalLoggerCompact wraps a MinimalLoggerCompact to provide a Logger.

func WrapPrintf 

func WrapPrintf(fn func(format string, args ...interface{})) Logger

WrapPrintf wraps a Printf-like function to provide a Logger.

type LoggerCompact 

type LoggerCompact interface {
	MinimalLoggerCompact
	LoggerExtensions
}

LoggerCompact is a kind of logger with one method Logf(level, ...) instead of separate methods Debugf(...), Infof(...), Warnf(...) and so on.

type LoggerExtensions 

type LoggerExtensions interface {
	// OriginalLogger returns the original logger without wrappers added
	// by this package.
	OriginalLogger() interface{}

	WithLevels
	WithFields
}

LoggerExtensions includes all the features required for a Logger over MinimalLogger.

type MinimalLogger 

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

MinimalLogger is a simple logger, for example logrus.Entry or zap.SugaredLogger could be candidates of an implementation of this interfaces.

Note: logrus.Entry and zap.SugaredLogger supports structured logging and they have With* methods, but the API is different, so we do not require that methods here. We add support of builtin structured logging and logging levels through logadapter-s, see for example logadapter/logrus.Adapter.Convert.

type MinimalLoggerCompact 

type MinimalLoggerCompact interface {
	Logf(logLevel Level, format string, args ...interface{})
}

type UncompactLoggerCompact 

type UncompactLoggerCompact struct {
	LoggerCompact
}

UncompactLoggerCompact converts LoggerCompact to Logger.

func (UncompactLoggerCompact) Debugf 

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

Debugf implements MinimalLogger.

func (UncompactLoggerCompact) Errorf 

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

Errorf implements MinimalLogger.

func (UncompactLoggerCompact) Fatalf 

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

Fatalf implements MinimalLogger.

func (UncompactLoggerCompact) Infof 

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

Infof implements MinimalLogger.

func (UncompactLoggerCompact) OriginalLogger 

func (l UncompactLoggerCompact) OriginalLogger() interface{}

OriginalLogger implements LoggerExtensions.

func (UncompactLoggerCompact) Panicf 

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

Panicf implements MinimalLogger.

func (UncompactLoggerCompact) Warnf 

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

Warnf implements MinimalLogger.

type UncompactMinimalLoggerCompact 

type UncompactMinimalLoggerCompact struct {
	MinimalLoggerCompact
}

UncompactMinimalLoggerCompact converts MinimalLoggerCompact to MinimalLogger.

func (UncompactMinimalLoggerCompact) Debugf 

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

Debugf implements MinimalLogger.

func (UncompactMinimalLoggerCompact) Errorf 

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

Errorf implements MinimalLogger.

func (UncompactMinimalLoggerCompact) Fatalf 

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

Fatalf implements MinimalLogger.

func (UncompactMinimalLoggerCompact) Infof 

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

Infof implements MinimalLogger.

func (UncompactMinimalLoggerCompact) OriginalLogger 

func (l UncompactMinimalLoggerCompact) OriginalLogger() interface{}

OriginalLogger implements LoggerExtensions.

func (UncompactMinimalLoggerCompact) Panicf 

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

Panicf implements MinimalLogger.

func (UncompactMinimalLoggerCompact) Warnf 

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

Warnf implements MinimalLogger.

type WithFields 

type WithFields interface {
	// WithField returns a logger with added field (used for structured logging).
	WithField(key string, value interface{}) Logger

	// WithFields returns a logger with added fields (used for structured logging).
	WithFields(fields Fields) Logger
}

WithFields requires methods of a logger with support of structured logging.

type WithLevels 

type WithLevels interface {
	// Level returns the current logging level.
	Level() Level

	// WithLevel returns a logger with logger level set to the passed argument.
	WithLevel(Level) Logger
}

WithLevels requires methods of a logger with support of logging levels.

Source Files

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