eventlog

Documentation

Index

• Variables
• func Configure(options ...Option)
• func ContextWithLoggable(ctx context.Context, l Loggable) context.Context
• type EventInProgress
  • func (eip *EventInProgress) Append(l Loggable)
  • func (eip *EventInProgress) Close() error
  • func (eip *EventInProgress) Done()
  • func (eip *EventInProgress) SetError(err error)
• type EventLogger
  • func Logger(system string) EventLogger
• type LogRotatorConfig
• type Loggable
  • func Deferred(key string, f func() string) Loggable
  • func Pair(key string, l Loggable) Loggable
• type LoggableF
  • func (l LoggableF) Loggable() map[string]interface{}
• type LoggableMap
  • func (l LoggableMap) Loggable() map[string]interface{}
• type Metadata
  • func DeepMerge(b, a Metadata) Metadata
  • func MetadataFromContext(ctx context.Context) (Metadata, error)
  • func Metadatify(i interface{}) (Metadata, error)
  • func Uuid(key string) Metadata
  • func (m Metadata) JsonString() (string, error)
  • func (m Metadata) Loggable() map[string]interface{}
• type Option
  • func Output(w io.Writer) Option
  • func OutputRotatingLogFile(config LogRotatorConfig) Option
• type PoliteJSONFormatter
  • func (f *PoliteJSONFormatter) Format(entry *logrus.Entry) ([]byte, error)
• type StandardLogger

Examples

• EventLogger

Variables

var LdJSONFormatter = func() {
	logrus.SetFormatter(&PoliteJSONFormatter{})
}

LdJSONFormatter Option formats the event log as line-delimited JSON

var LevelDebug = func() {
	logrus.SetLevel(logrus.DebugLevel)
}

LevelDebug Option sets the log level to debug

var LevelError = func() {
	logrus.SetLevel(logrus.ErrorLevel)
}

LevelDebug Option sets the log level to error

var LevelInfo = func() {
	logrus.SetLevel(logrus.InfoLevel)
}

LevelDebug Option sets the log level to info

var TextFormatter = func() {
	logrus.SetFormatter(&logrus.TextFormatter{})
}

TextFormatter Option formats the event log as human-readable plain-text

Functions

func Configure

func Configure(options ...Option)

Configure applies the provided options sequentially from left to right

func ContextWithLoggable

func ContextWithLoggable(ctx context.Context, l Loggable) context.Context

ContextWithLoggable returns a derived context which contains the provided Loggable. Any Events logged with the derived context will include the provided Loggable.

Types

type EventInProgress

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

func (*EventInProgress) Append

func (eip *EventInProgress) Append(l Loggable)

Append adds loggables to be included in the call to Done

func (*EventInProgress) Close

func (eip *EventInProgress) Close() error

Close is an alias for done

func (*EventInProgress) Done

func (eip *EventInProgress) Done()

Done creates a new Event entry that includes the duration and appended loggables.

func (*EventInProgress) SetError

func (eip *EventInProgress) SetError(err error)

SetError includes the provided error

type EventLogger

type EventLogger interface {
	StandardLogger

	// Event merges structured data from the provided inputs into a single
	// machine-readable log event.
	//
	// If the context contains metadata, a copy of this is used as the base
	// metadata accumulator.
	//
	// If one or more loggable objects are provided, these are deep-merged into base blob.
	//
	// Next, the event name is added to the blob under the key "event". If
	// the key "event" already exists, it will be over-written.
	//
	// Finally the timestamp and package name are added to the accumulator and
	// the metadata is logged.
	Event(ctx context.Context, event string, m ...Loggable)

	EventBegin(ctx context.Context, event string, m ...Loggable) *EventInProgress
}

EventLogger extends the StandardLogger interface to allow for log items containing structured metadata

Example

{
	log := EventLogger(nil)
	e := log.EventBegin(context.Background(), "dial")
	e.Done()
}
{
	log := EventLogger(nil)
	e := log.EventBegin(context.Background(), "dial")
	_ = e.Close() // implements io.Closer for convenience
}

func Logger

func Logger(system string) EventLogger

Logger retrieves an event logger by name

type LogRotatorConfig

type LogRotatorConfig struct {
	Filename   string
	MaxSizeMB  int
	MaxBackups int
	MaxAgeDays int
}

type Loggable

type Loggable interface {
	Loggable() map[string]interface{}
}

Loggable describes objects that can be marshalled into Metadata for logging

func Deferred

func Deferred(key string, f func() string) Loggable

func Pair

func Pair(key string, l Loggable) Loggable

type LoggableF

type LoggableF func() map[string]interface{}

Loggable converts a func into a Loggable

func (LoggableF) Loggable

func (l LoggableF) Loggable() map[string]interface{}

type LoggableMap

type LoggableMap map[string]interface{}

func (LoggableMap) Loggable

func (l LoggableMap) Loggable() map[string]interface{}

type Metadata

type Metadata map[string]interface{}

Metadata is a convenience type for generic maps

func DeepMerge

func DeepMerge(b, a Metadata) Metadata

DeepMerge merges the second Metadata parameter into the first. Nested Metadata are merged recursively. Primitives are over-written.

func MetadataFromContext

func MetadataFromContext(ctx context.Context) (Metadata, error)

func Metadatify

func Metadatify(i interface{}) (Metadata, error)

Metadatify converts maps into Metadata

func Uuid

func Uuid(key string) Metadata

Uuid returns a Metadata with the string key and UUID value

func (Metadata) JsonString

func (m Metadata) JsonString() (string, error)

func (Metadata) Loggable

func (m Metadata) Loggable() map[string]interface{}

Loggable implements the Loggable interface

type Option

type Option func()

func Output

func Output(w io.Writer) Option

func OutputRotatingLogFile

func OutputRotatingLogFile(config LogRotatorConfig) Option

type PoliteJSONFormatter

type PoliteJSONFormatter struct{}

PoliteJSONFormatter marshals entries into JSON encoded slices (without overwriting user-provided keys). How polite of it!

func (*PoliteJSONFormatter) Format

func (f *PoliteJSONFormatter) Format(entry *logrus.Entry) ([]byte, error)

type StandardLogger

type StandardLogger interface {
	Critical(args ...interface{})
	Criticalf(format string, args ...interface{})
	Debug(args ...interface{})
	Debugf(format string, args ...interface{})
	Error(args ...interface{})
	Errorf(format string, args ...interface{})
	Fatal(args ...interface{})
	Fatalf(format string, args ...interface{})
	Info(args ...interface{})
	Infof(format string, args ...interface{})
	Notice(args ...interface{})
	Noticef(format string, args ...interface{})
	Panic(args ...interface{})
	Panicf(format string, args ...interface{})
	Warning(args ...interface{})
	Warningf(format string, args ...interface{})
}

StandardLogger provides API compatibility with standard printf loggers eg. go-logging