logging

package
v0.0.0-...-ebe7275 Latest Latest
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 Go to latest Published: Dec 23, 2024 License: BSD-2-Clause-Patent Imports: 16 Imported by: 72

Documentation

Index

Constants

View Source 
const (
	DefaultLogLevel = LogLevelInfo
)

Variables

This section is empty.

Functions

func MustCreateSyslogger 

func MustCreateSyslogger(prio syslog.Priority, flags int) *log.Logger

MustCreateSyslogger attempts to create a *log.Logger configured for output to the system log daemon. If it fails, it will panic.

func NewTestCommandLineLogger 

func NewTestCommandLineLogger() (*LeveledLogger, *LogBuffer)

NewTestCommandlineLogger returns a commandline logger and a *LogBuffer, with the logger configured to send all output into the buffer. The logger's level is set to TRACE by default.

func NewTestLogger 

func NewTestLogger(prefix string) (*LeveledLogger, *LogBuffer)

NewTestLogger returns a logger and a *LogBuffer, with the logger configured to send all output into the buffer. The logger's level is set to TRACE by default.

func ShortUUID 

func ShortUUID(u uuid.UUID) string

ShortUUID returns a truncated UUID string suitable for debug logging.

func ToContext 

func ToContext(ctx context.Context, logger Logger) (context.Context, error)

ToContext adds the logger to the context if it is not already present.

Types

type DebugLogger 

type DebugLogger interface {
	Debugf(format string, args ...interface{})
}

DebugLogger defines an interface to be implemented by Debug loggers.

type DefaultDebugLogger 

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

DefaultDebugLogger implements the DebugLogger interface.

func NewDebugLogger 

func NewDebugLogger(dest io.Writer) *DefaultDebugLogger

NewDebugLogger returns a DebugLogger configured for outputting debugging messages.

func (*DefaultDebugLogger) Debugf 

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

Debugf emits a formatted debug message.

func (*DefaultDebugLogger) WithJSONOutput 

func (l *DefaultDebugLogger) WithJSONOutput() DebugLogger

WithJSONOutput switches the logger's output to use structured JSON formatting.

func (*DefaultDebugLogger) WithSyslogOutput 

func (l *DefaultDebugLogger) WithSyslogOutput() DebugLogger

WithSyslogOutput switches the logger's output to emit messages via the system logging service.

type DefaultErrorLogger 

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

DefaultErrorLogger implements the ErrorLogger interface.

func NewCommandLineErrorLogger 

func NewCommandLineErrorLogger(output io.Writer) *DefaultErrorLogger

NewCommandLineErrorLogger returns an ErrorLogger configured for outputting unadorned error messages (i.e. no timestamps, source info, etc); typically used for CLI utility logging.

func NewErrorLogger 

func NewErrorLogger(prefix string, output io.Writer) *DefaultErrorLogger

NewErrorLogger returns an ErrorLogger configured for outputting error messages with standard formatting (e.g. to stderr, logfile, etc.)

func (*DefaultErrorLogger) Errorf 

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

Errorf emits a formatted error message.

func (*DefaultErrorLogger) WithJSONOutput 

func (l *DefaultErrorLogger) WithJSONOutput() ErrorLogger

WithJSONOutput switches the logger's output to use structured JSON formatting.

func (*DefaultErrorLogger) WithSyslogOutput 

func (l *DefaultErrorLogger) WithSyslogOutput() ErrorLogger

WithSyslogOutput switches the logger's output to emit messages via the system logging service.

type DefaultInfoLogger 

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

DefaultInfoLogger implements the InfoLogger interface.

func NewCommandLineInfoLogger 

func NewCommandLineInfoLogger(output io.Writer) *DefaultInfoLogger

NewCommandLineInfoLogger returns an InfoLogger configured for outputting unadorned informational messages (i.e. no timestamps, source info, etc); typically used for CLI utility logging.

func NewInfoLogger 

func NewInfoLogger(prefix string, output io.Writer) *DefaultInfoLogger

NewInfoLogger returns an InfoLogger configured for outputting informational messages with standard formatting (e.g. to stderr, logfile, etc.)

func (*DefaultInfoLogger) Infof 

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

Infof emits a formatted informational message.

func (*DefaultInfoLogger) WithJSONOutput 

func (l *DefaultInfoLogger) WithJSONOutput() InfoLogger

WithJSONOutput switches the logger's output to use structured JSON formatting.

func (*DefaultInfoLogger) WithSyslogOutput 

func (l *DefaultInfoLogger) WithSyslogOutput() InfoLogger

WithSyslogOutput switches the logger's output to emit messages via the system logging service.

type DefaultNoticeLogger 

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

DefaultNoticeLogger implements the NoticeLogger interface.

func NewCommandLineNoticeLogger 

func NewCommandLineNoticeLogger(output io.Writer) *DefaultNoticeLogger

NewCommandLineNoticeLogger returns a NoticeLogger configured for outputting unadorned notice messages (i.e. no timestamps, source info, etc); typically used for CLI utility logging.

func NewNoticeLogger 

func NewNoticeLogger(prefix string, output io.Writer) *DefaultNoticeLogger

NewNoticeLogger returns NoticeLogger configured for outputting notice messages with standard formatting (e.g. to stderr, logfile, etc.)

func (*DefaultNoticeLogger) Noticef 

func (l *DefaultNoticeLogger) Noticef(format string, args ...interface{})

Noticef emits a formatted notice message.

func (*DefaultNoticeLogger) WithJSONOutput 

func (l *DefaultNoticeLogger) WithJSONOutput() NoticeLogger

WithJSONOutput switches the logger's output to use structured JSON formatting.

func (*DefaultNoticeLogger) WithSyslogOutput 

func (l *DefaultNoticeLogger) WithSyslogOutput() NoticeLogger

WithSyslogOutput switches the logger's output to emit messages via the system logging service.

type DefaultTraceLogger 

type DefaultTraceLogger DefaultDebugLogger

DefaultTraceLogger implements the TraceLogger interface by wrapping the DefaultDebugLogger implementation.

func NewTraceLogger 

func NewTraceLogger(dest io.Writer) *DefaultTraceLogger

NewTraceLogger returns a DebugLogger configured for outputting trace-level messages.

func (*DefaultTraceLogger) Tracef 

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

Tracef emits a formatted trace message.

type ErrorLogger 

type ErrorLogger interface {
	Errorf(format string, args ...interface{})
}

ErrorLogger defines an interface to be implemented by Error loggers.

type InfoLogger 

type InfoLogger interface {
	Infof(format string, args ...interface{})
}

InfoLogger defines an interface to be implemented by Info loggers.

type JSONFormatter 

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

JSONFormatter emits JSON-formatted log output

func NewJSONFormatter 

func NewJSONFormatter(output io.Writer, level, extraData string, flags int) *JSONFormatter

NewJSONFormatter returns a *JSONFormatter configured to emit JSON-formatted output.

func (*JSONFormatter) Output 

func (f *JSONFormatter) Output(callDepth int, msg string) error

Output emulates log.Logger's Output(), but formats the message as a JSON-structured log entry.

type LeveledLogger 

type LeveledLogger struct {
	sync.RWMutex
	// contains filtered or unexported fields
}

LeveledLogger provides a logging implementation which can emit log messages to multiple destinations with different output formats.

func NewCombinedLogger 

func NewCombinedLogger(prefix string, output io.Writer) *LeveledLogger

NewCombinedLogger returns a logger configured to send all output to the supplied io.Writer.

func NewCommandLineLogger 

func NewCommandLineLogger() *LeveledLogger

NewCommandLineLogger returns a logger configured to send non-error output to stdout and error/debug output to stderr. The output format is suitable for command line utilities which don't want output to include timestamps and filenames.

func NewStdoutLogger 

func NewStdoutLogger(prefix string) *LeveledLogger

NewStdoutLogger returns a logger configured to send all output to stdout (suitable for containerized/systemd operation).

func (*LeveledLogger) AddDebugLogger 

func (ll *LeveledLogger) AddDebugLogger(newLogger DebugLogger)

AddDebugLogger adds the specified Debug logger to the logger.

func (*LeveledLogger) AddErrorLogger 

func (ll *LeveledLogger) AddErrorLogger(newLogger ErrorLogger)

AddErrorLogger adds the specified Error logger to the logger.

func (*LeveledLogger) AddInfoLogger 

func (ll *LeveledLogger) AddInfoLogger(newLogger InfoLogger)

AddInfoLogger adds the specified Info logger to the logger.

func (*LeveledLogger) AddNoticeLogger 

func (ll *LeveledLogger) AddNoticeLogger(newLogger NoticeLogger)

AddNoticeLogger adds the specified Notice logger to the logger.

func (*LeveledLogger) AddTraceLogger 

func (ll *LeveledLogger) AddTraceLogger(newLogger TraceLogger)

AddTraceLogger adds the specified Trace logger to the logger.

func (*LeveledLogger) ClearLevel 

func (ll *LeveledLogger) ClearLevel(level LogLevel)

ClearLevel clears all loggers for the specified level.

func (*LeveledLogger) Debug 

func (ll *LeveledLogger) Debug(msg string)

Debug emits an unformatted message at Debug level, if the logger is configured to do so.

func (*LeveledLogger) Debugf 

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

Debugf emits a formatted message at Debug level, if the logger is configured to do so.

func (*LeveledLogger) EnabledFor 

func (ll *LeveledLogger) EnabledFor(level LogLevel) bool

EnabledFor returns true if the logger is enabled for the specified LogLevel.

func (*LeveledLogger) Error 

func (ll *LeveledLogger) Error(msg string)

Error emits an unformatted message at Error level, if the logger is configured to do so.

func (*LeveledLogger) Errorf 

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

Errorf emits a formatted message at Error level, if the logger is configured to do so.

func (*LeveledLogger) Info 

func (ll *LeveledLogger) Info(msg string)

Info emits an unformatted message at Info level, if the logger is configured to do so.

func (*LeveledLogger) Infof 

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

Infof emits a formatted message at Info level, if the logger is configured to do so.

func (*LeveledLogger) Level 

func (ll *LeveledLogger) Level() LogLevel

Level returns the logger's current LogLevel.

func (*LeveledLogger) Notice 

func (ll *LeveledLogger) Notice(msg string)

Notice emits an unformatted message at Notice level, if the logger is configured to do so.

func (*LeveledLogger) Noticef 

func (ll *LeveledLogger) Noticef(format string, args ...interface{})

Noticef emits a formatted message at Notice level, if the logger is configured to do so.

func (*LeveledLogger) SetLevel 

func (ll *LeveledLogger) SetLevel(newLevel LogLevel)

SetLevel sets the logger's LogLevel, at or above which messages will be emitted.

func (*LeveledLogger) Trace 

func (ll *LeveledLogger) Trace(msg string)

Trace emits an unformatted message at Trace level, if the logger is configured to do so.

func (*LeveledLogger) Tracef 

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

Tracef emits a formatted message at Trace level, if the logger is configured to do so.

func (*LeveledLogger) WithDebugLogger 

func (ll *LeveledLogger) WithDebugLogger(newLogger DebugLogger) *LeveledLogger

WithDebugLogger adds the specified Debug logger to the logger as part of a chained method call.

func (*LeveledLogger) WithErrorLogger 

func (ll *LeveledLogger) WithErrorLogger(newLogger ErrorLogger) *LeveledLogger

WithErrorLogger adds the specified Error logger to the logger as part of a chained method call.

func (*LeveledLogger) WithInfoLogger 

func (ll *LeveledLogger) WithInfoLogger(newLogger InfoLogger) *LeveledLogger

WithInfoLogger adds the specified Info logger to the logger as part of a chained method call.

func (*LeveledLogger) WithJSONOutput 

func (ll *LeveledLogger) WithJSONOutput() *LeveledLogger

WithJSONOutput is a convenience method to set all logging outputs to the JSON formatter.

func (*LeveledLogger) WithLogLevel 

func (ll *LeveledLogger) WithLogLevel(level LogLevel) *LeveledLogger

WithLogLevel allows the logger's LogLevel to be set as part of a chained method call.

func (*LeveledLogger) WithNoticeLogger 

func (ll *LeveledLogger) WithNoticeLogger(newLogger NoticeLogger) *LeveledLogger

WithNoticeLogger adds the specified Notice logger to the logger as part of a chained method call.

func (*LeveledLogger) WithSyslogOutput 

func (ll *LeveledLogger) WithSyslogOutput() *LeveledLogger

WithSyslogOutput is a convenience method to set all logging outputs to the Syslog formatter.

func (*LeveledLogger) WithTraceLogger 

func (ll *LeveledLogger) WithTraceLogger(newLogger TraceLogger) *LeveledLogger

WithTraceLogger adds the specified Trace logger to the logger as part of a chained method call.

type LogBuffer 

type LogBuffer struct {
	sync.Mutex
	// contains filtered or unexported fields
}

LogBuffer provides a thread-safe wrapper for bytes.Buffer. It only wraps a subset of bytes.Buffer's methods; just enough to implement io.Reader, io.Writer, and fmt.Stringer. The Reset() method is also wrapped in order to make it useful for testing.

func (*LogBuffer) Read 

func (lb *LogBuffer) Read(p []byte) (int, error)

func (*LogBuffer) Reset 

func (lb *LogBuffer) Reset()

func (*LogBuffer) String 

func (lb *LogBuffer) String() string

func (*LogBuffer) Write 

func (lb *LogBuffer) Write(p []byte) (int, error)

type LogLevel 

type LogLevel int32

LogLevel represents the level at which the logger will emit log messages 

const (
	// LogLevelDisabled disables any logging output
	LogLevelDisabled LogLevel = iota
	// LogLevelError emits messages at ERROR or higher
	LogLevelError
	// LogLevelNotice emits messages at NOTICE or higher
	LogLevelNotice
	// LogLevelInfo emits messages at INFO or higher
	LogLevelInfo
	// LogLevelDebug emits messages at DEBUG or higher
	LogLevelDebug
	// LogLevelTrace emits messages at TRACE or higher
	LogLevelTrace
)

func (*LogLevel) Get 

func (ll *LogLevel) Get() LogLevel

Get returns the current log level

func (*LogLevel) Set 

func (ll *LogLevel) Set(newLevel LogLevel)

Set safely sets the log level to the supplied level

func (*LogLevel) SetString 

func (ll *LogLevel) SetString(in string) error

SetString sets the log level from the supplied string.

func (LogLevel) String 

func (ll LogLevel) String() string

type Logger 

type Logger interface {
	EnabledFor(level LogLevel) bool
	TraceLogger
	Trace(msg string)
	DebugLogger
	Debug(msg string)
	InfoLogger
	Info(msg string)
	NoticeLogger
	Notice(msg string)
	ErrorLogger
	Error(msg string)
}

Logger defines a standard logging interface

func FromContext 

func FromContext(ctx context.Context) Logger

FromContext returns the logger from the context, or a no-op logger if no logger is present.

type NoticeLogger 

type NoticeLogger interface {
	Noticef(format string, args ...interface{})
}

NoticeLogger defines an interface to be implemented by Notice loggers.

type Outputter 

type Outputter interface {
	Output(callDepth int, msg string) error
}

Outputter defines an interface to be implemented by output formatters.

type TraceLogger 

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

TraceLogger defines an interface to be implemented by Trace loggers.

Source Files

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