log

Documentation

Overview

Package log contains utilities for fetching a new logger when one is not already available.

The Log Handle

This package contains a root logr.Logger Log. It may be used to get a handle to whatever the root logging implementation is. By default, no implementation exists, and the handle returns "promises" to loggers. When the implementation is set using SetLogger, these "promises" will be converted over to real loggers.

Logr

All logging in controller-runtime is structured, using a set of interfaces defined by a package called logr (https://godoc.org/github.com/go-logr/logr). The sub-package zap provides helpers for setting up logr backed by Zap (go.uber.org/zap).

Index

• Variables
• func FromContext(ctx context.Context, keysAndValues ...interface{}) logr.Logger
• func IntoContext(ctx context.Context, log logr.Logger) context.Context
• func SetLogger(l logr.Logger)
• type DelegatingLogger
  • func NewDelegatingLogger(initial logr.Logger) *DelegatingLogger
  • func (l *DelegatingLogger) Enabled() bool
  • func (l *DelegatingLogger) Error(err error, msg string, keysAndValues ...interface{})
  • func (l *DelegatingLogger) Fulfill(actual logr.Logger)
  • func (l *DelegatingLogger) Info(msg string, keysAndValues ...interface{})
  • func (l *DelegatingLogger) V(level int) logr.Logger
  • func (l *DelegatingLogger) WithName(name string) logr.Logger
  • func (l *DelegatingLogger) WithValues(tags ...interface{}) logr.Logger
• type NullLogger
  • func (NullLogger) Enabled() bool
  • func (NullLogger) Error(_ error, _ string, _ ...interface{})
  • func (NullLogger) Info(_ string, _ ...interface{})
  • func (log NullLogger) V(_ int) logr.InfoLogger
  • func (log NullLogger) WithName(_ string) logr.Logger
  • func (log NullLogger) WithValues(_ ...interface{}) logr.Logger

Variables

var Log = NewDelegatingLogger(NullLogger{})

Log is the base logger used by kubebuilder. It delegates to another logr.Logger. You *must* call SetLogger to get any actual logging. If SetLogger is not called within the first 30 seconds of a binaries lifetime, it will get set to a NullLogger.

Functions

func FromContext

func FromContext(ctx context.Context, keysAndValues ...interface{}) logr.Logger

FromContext returns a logger with predefined values from a context.Context.

func IntoContext

func IntoContext(ctx context.Context, log logr.Logger) context.Context

IntoContext takes a context and sets the logger as one of its values. Use FromContext function to retrieve the logger.

func SetLogger

func SetLogger(l logr.Logger)

SetLogger sets a concrete logging implementation for all deferred Loggers.

Types

type DelegatingLogger

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

DelegatingLogger is a logr.Logger that delegates to another logr.Logger. If the underlying promise is not nil, it registers calls to sub-loggers with the logging factory to be populated later, and returns a new delegating logger. It expects to have *some* logr.Logger set at all times (generally a no-op logger before the promises are fulfilled).

func NewDelegatingLogger

func NewDelegatingLogger(initial logr.Logger) *DelegatingLogger

NewDelegatingLogger constructs a new DelegatingLogger which uses the given logger before it's promise is fulfilled.

func (*DelegatingLogger) Enabled

func (l *DelegatingLogger) Enabled() bool

Enabled tests whether this Logger is enabled. For example, commandline flags might be used to set the logging verbosity and disable some info logs.

func (*DelegatingLogger) Error

func (l *DelegatingLogger) Error(err error, msg string, keysAndValues ...interface{})

Error logs an error, with the given message and key/value pairs as context. It functions similarly to calling Info with the "error" named value, but may have unique behavior, and should be preferred for logging errors (see the package documentations for more information).

The msg field should be used to add context to any underlying error, while the err field should be used to attach the actual error that triggered this log line, if present.

func (*DelegatingLogger) Fulfill

func (l *DelegatingLogger) Fulfill(actual logr.Logger)

Fulfill switches the logger over to use the actual logger provided, instead of the temporary initial one, if this method has not been previously called.

func (*DelegatingLogger) Info

func (l *DelegatingLogger) Info(msg string, keysAndValues ...interface{})

Info logs a non-error message with the given key/value pairs as context.

The msg argument should be used to add some constant description to the log line. The key/value pairs can then be used to add additional variable information. The key/value pairs should alternate string keys and arbitrary values.

func (*DelegatingLogger) V

func (l *DelegatingLogger) V(level int) logr.Logger

V returns an Logger value for a specific verbosity level, relative to this Logger. In other words, V values are additive. V higher verbosity level means a log message is less important. It's illegal to pass a log level less than zero.

func (*DelegatingLogger) WithName

func (l *DelegatingLogger) WithName(name string) logr.Logger

WithName provides a new Logger with the name appended

func (*DelegatingLogger) WithValues

func (l *DelegatingLogger) WithValues(tags ...interface{}) logr.Logger

WithValues provides a new Logger with the tags appended

type NullLogger

type NullLogger struct{}

NullLogger is a logr.Logger that does nothing.

func (NullLogger) Enabled

func (NullLogger) Enabled() bool

Enabled implements logr.InfoLogger

func (NullLogger) Error

func (NullLogger) Error(_ error, _ string, _ ...interface{})

Error implements logr.Logger

func (NullLogger) Info

func (NullLogger) Info(_ string, _ ...interface{})

Info implements logr.InfoLogger

func (NullLogger) V

func (log NullLogger) V(_ int) logr.InfoLogger

V implements logr.Logger

func (NullLogger) WithName

func (log NullLogger) WithName(_ string) logr.Logger

WithName implements logr.Logger

func (NullLogger) WithValues

func (log NullLogger) WithValues(_ ...interface{}) logr.Logger

WithValues implements logr.Logger