zerolog

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Published: Oct 29, 2021 License: Apache-2.0, MIT Imports: 19 Imported by: 0

Documentation

Overview

Package zerolog provides a lightweight logging library dedicated to JSON logging.

A global Logger can be use for simple logging:

import "github.com/didi/gatekeeper/golang_common/zerolog/log"

log.Info().Msg("hello world")
// Output: {"time":1494567715,"level":"info","message":"hello world"}

NOTE: To import the global logger, import the "log" subpackage "github.com/didi/gatekeeper/golang_common/zerolog/log".

Fields can be added to log messages:

log.Info().Str("foo", "bar").Msg("hello world")
// Output: {"time":1494567715,"level":"info","message":"hello world","foo":"bar"}

Create logger instance to manage different outputs:

logger := zerolog.New(os.Stderr).With().Timestamp().Logger()
logger.Info().
       Str("foo", "bar").
       Msg("hello world")
// Output: {"time":1494567715,"level":"info","message":"hello world","foo":"bar"}

Sub-loggers let you chain loggers with additional context:

sublogger := log.With().Str("component": "foo").Logger()
sublogger.Info().Msg("hello world")
// Output: {"time":1494567715,"level":"info","message":"hello world","component":"foo"}

Level logging

zerolog.SetGlobalLevel(zerolog.InfoLevel)

log.Debug().Msg("filtered out message")
log.Info().Msg("routed message")

if e := log.Debug(); e.Enabled() {
    // Compute log output only if enabled.
    value := compute()
    e.Str("foo": value).Msg("some debug message")
}
// Output: {"level":"info","time":1494567715,"routed message"}

Customize automatic field names:

log.TimestampFieldName = "t"
log.LevelFieldName = "p"
log.MessageFieldName = "m"

log.Info().Msg("hello world")
// Output: {"t":1494567715,"p":"info","m":"hello world"}

Log with no level and message:

log.Log().Str("foo","bar").Msg("")
// Output: {"time":1494567715,"foo":"bar"}

Add contextual fields to global Logger:

log.Logger = log.With().Str("foo", "bar").Logger()

Sample logs:

sampled := log.Sample(&zerolog.BasicSampler{N: 10})
sampled.Info().Msg("will be logged every 10 messages")

Log with contextual hooks:

// Create the hook:
type SeverityHook struct{}

func (h SeverityHook) Run(e *zerolog.Event, level zerolog.Level, msg string) {
     if level != zerolog.NoLevel {
         e.Str("severity", level.String())
     }
}

// And use it:
var h SeverityHook
log := zerolog.New(os.Stdout).Hook(h)
log.Warn().Msg("")
// Output: {"level":"warn","severity":"warn"}

Caveats

There is no fields deduplication out-of-the-box. Using the same key multiple times creates new key in final JSON each time.

logger := zerolog.New(os.Stderr).With().Timestamp().Logger()
logger.Info().
       Timestamp().
       Msg("dup")
// Output: {"level":"info","time":1494567715,"time":1494567715,"message":"dup"}

However, it’s not a big deal though as JSON accepts dup keys, the last one prevails.

Index

Examples

Constants

This section is empty.

Variables

View Source
var (
	// TimestampFieldName is the field name used for the timestamp field.
	TimestampFieldName = "time"

	// LevelFieldName is the field name used for the level field.
	LevelFieldName = "level"

	// MessageFieldName is the field name used for the message field.
	MessageFieldName = "message"

	// ErrorFieldName is the field name used for error fields.
	ErrorFieldName = "error"

	// CallerFieldName is the field name used for caller field.
	CallerFieldName = "caller"

	// CallerSkipFrameCount is the number of stack frames to skip to find the caller.
	CallerSkipFrameCount = 3

	// TimeFieldFormat defines the time format of the Time field type.
	// If set to an empty string, the time is formatted as an UNIX timestamp
	// as integer.
	TimeFieldFormat = time.RFC3339

	// TimestampFunc defines the function called to generate a timestamp.
	TimestampFunc = time.Now

	// DurationFieldUnit defines the unit for time.Duration type fields added
	// using the Dur method.
	DurationFieldUnit = time.Millisecond

	// DurationFieldInteger renders Dur fields as integer instead of float if
	// set to true.
	DurationFieldInteger = false

	// ErrorHandler is called whenever zerolog fails to write an event on its
	// output. If not set, an error is printed on the stderr. This handler must
	// be thread safe and non-blocking.
	ErrorHandler func(err error)
)
View Source
var (
	// Often samples log every ~ 10 events.
	Often = RandomSampler(10)
	// Sometimes samples log every ~ 100 events.
	Sometimes = RandomSampler(100)
	// Rarely samples log every ~ 1000 events.
	Rarely = RandomSampler(1000)
)
View Source
var ErrorMarshalFunc = func(err error) interface{} {
	return err
}

ErrorMarshalFunc allows customization of global error marshaling

Functions

func DisableSampling

func DisableSampling(v bool)

DisableSampling will disable sampling in all Loggers if true.

func SetGlobalLevel

func SetGlobalLevel(l Level)

SetGlobalLevel sets the global override for log level. If this values is raised, all Loggers will use at least this value.

To globally disable logs, set GlobalLevel to Disabled.

func SyncWriter

func SyncWriter(w io.Writer) io.Writer

SyncWriter wraps w so that each call to Write is synchronized with a mutex. This syncer can be the call to writer's Write method is not thread safe. Note that os.File Write operation is using write() syscall which is supposed to be thread-safe on POSIX systems. So there is no need to use this with os.File on such systems as zerolog guaranties to issue a single Write call per log event.

Types

type AccessWriter

type AccessWriter struct {

	//normal file
	FileOut *os.File

	//auto clear the log
	AutoClear bool

	//file directory
	FileDir string

	//file prefix name
	FilePrefix string

	//clear hours
	ClearHours int32

	//clear steps
	ClearStep int32

	//is Disable link
	DisableLink bool

	//caller format func
	FormatCallerFunc func(i string) string

	// time format func
	FormatTimestampFunc func() string

	// msg format func
	FormatMessageFunc func(i string) string

	// level format func
	FormatLevelFunc func(i string) string
	// contains filtered or unexported fields
}

func NewAccessWriter

func NewAccessWriter(options ...Option) *AccessWriter

NewFileWriter creates and initializes a new AccessWriter.

func (*AccessWriter) FormatCaller

func (w *AccessWriter) FormatCaller(i string) string

func (*AccessWriter) FormatLevel

func (w *AccessWriter) FormatLevel(i string) string

func (*AccessWriter) FormatMessage

func (w *AccessWriter) FormatMessage(i string) string

func (*AccessWriter) FormatTimestamp

func (w *AccessWriter) FormatTimestamp() string

func (*AccessWriter) Write

func (w *AccessWriter) Write(p []byte) (n int, err error)

func (*AccessWriter) WriteLevel

func (w *AccessWriter) WriteLevel(l Level, p []byte) (n int, err error)

type Array

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

Array is used to prepopulate an array of items which can be re-used to add to log messages.

func Arr

func Arr() *Array

Arr creates an array to be added to an Event or Context.

func (*Array) Bool

func (a *Array) Bool(b bool) *Array

Bool append append the val as a bool to the array.

func (*Array) Bytes

func (a *Array) Bytes(val []byte) *Array

Bytes append append the val as a string to the array.

func (*Array) Dur

func (a *Array) Dur(d time.Duration) *Array

Dur append append d to the array.

func (*Array) Err

func (a *Array) Err(err error) *Array

Err serializes and appends the err to the array.

func (*Array) Float32

func (a *Array) Float32(f float32) *Array

Float32 append append f as a float32 to the array.

func (*Array) Float64

func (a *Array) Float64(f float64) *Array

Float64 append append f as a float64 to the array.

func (*Array) Hex

func (a *Array) Hex(val []byte) *Array

Hex append append the val as a hex string to the array.

func (*Array) IPAddr

func (a *Array) IPAddr(ip net.IP) *Array

IPAddr adds IPv4 or IPv6 address to the array

func (*Array) IPPrefix

func (a *Array) IPPrefix(pfx net.IPNet) *Array

IPPrefix adds IPv4 or IPv6 Prefix (IP + mask) to the array

func (*Array) Int

func (a *Array) Int(i int) *Array

Int append append i as a int to the array.

func (*Array) Int16

func (a *Array) Int16(i int16) *Array

Int16 append append i as a int16 to the array.

func (*Array) Int32

func (a *Array) Int32(i int32) *Array

Int32 append append i as a int32 to the array.

func (*Array) Int64

func (a *Array) Int64(i int64) *Array

Int64 append append i as a int64 to the array.

func (*Array) Int8

func (a *Array) Int8(i int8) *Array

Int8 append append i as a int8 to the array.

func (*Array) Interface

func (a *Array) Interface(i interface{}) *Array

Interface append append i marshaled using reflection.

func (*Array) MACAddr

func (a *Array) MACAddr(ha net.HardwareAddr) *Array

MACAddr adds a MAC (Ethernet) address to the array

func (*Array) MarshalZerologArray

func (*Array) MarshalZerologArray(*Array)

MarshalZerologArray method here is no-op - since data is already in the needed format.

func (*Array) Str

func (a *Array) Str(val string) *Array

Str append append the val as a string to the array.

func (*Array) Time

func (a *Array) Time(t time.Time) *Array

Time append append t formated as string using zerolog.TimeFieldFormat.

func (*Array) Uint

func (a *Array) Uint(i uint) *Array

Uint append append i as a uint to the array.

func (*Array) Uint16

func (a *Array) Uint16(i uint16) *Array

Uint16 append append i as a uint16 to the array.

func (*Array) Uint32

func (a *Array) Uint32(i uint32) *Array

Uint32 append append i as a uint32 to the array.

func (*Array) Uint64

func (a *Array) Uint64(i uint64) *Array

Uint64 append append i as a uint64 to the array.

func (*Array) Uint8

func (a *Array) Uint8(i uint8) *Array

Uint8 append append i as a uint8 to the array.

type BasicSampler

type BasicSampler struct {
	N uint32
	// contains filtered or unexported fields
}

BasicSampler is a sampler that will send every Nth events, regardless of there level.

func (*BasicSampler) Sample

func (s *BasicSampler) Sample(lvl Level) bool

Sample implements the Sampler interface.

type BurstSampler

type BurstSampler struct {
	// Burst is the maximum number of event per period allowed before calling
	// NextSampler.
	Burst uint32
	// Period defines the burst period. If 0, NextSampler is always called.
	Period time.Duration
	// NextSampler is the sampler used after the burst is reached. If nil,
	// events are always rejected after the burst.
	NextSampler Sampler
	// contains filtered or unexported fields
}

BurstSampler lets Burst events pass per Period then pass the decision to NextSampler. If Sampler is not set, all subsequent events are rejected.

func (*BurstSampler) Sample

func (s *BurstSampler) Sample(lvl Level) bool

Sample implements the Sampler interface.

type ConsoleWriter

type ConsoleWriter struct {
	// Out is the output destination.
	Out io.Writer

	// NoColor disables the colorized output.
	NoColor bool

	// TimeFormat specifies the format for timestamp in output.
	TimeFormat string

	// PartsOrder defines the order of parts in output.
	PartsOrder []string

	FormatTimestamp     Formatter
	FormatLevel         Formatter
	FormatCaller        Formatter
	FormatMessage       Formatter
	FormatFieldName     Formatter
	FormatFieldValue    Formatter
	FormatErrFieldName  Formatter
	FormatErrFieldValue Formatter
}

ConsoleWriter parses the JSON input and writes it in an (optionally) colorized, human-friendly format to Out.

func NewConsoleWriter

func NewConsoleWriter(options ...func(w *ConsoleWriter)) ConsoleWriter

NewConsoleWriter creates and initializes a new ConsoleWriter.

func (ConsoleWriter) Write

func (w ConsoleWriter) Write(p []byte) (n int, err error)

Write transforms the JSON input with formatters and appends to w.Out.

type Context

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

Context configures a new sub-logger with contextual fields.

func (Context) AnErr

func (c Context) AnErr(key string, err error) Context

AnErr adds the field key with serialized err to the logger context.

func (Context) Bool

func (c Context) Bool(key string, b bool) Context

Bool adds the field key with val as a bool to the logger context.

func (Context) Bools

func (c Context) Bools(key string, b []bool) Context

Bools adds the field key with val as a []bool to the logger context.

func (Context) Bytes

func (c Context) Bytes(key string, val []byte) Context

Bytes adds the field key with val as a []byte to the logger context.

func (Context) Caller

func (c Context) Caller() Context

Caller adds the file:line of the caller with the zerolog.CallerFieldName key.

func (Context) Dur

func (c Context) Dur(key string, d time.Duration) Context

Dur adds the fields key with d divided by unit and stored as a float.

Example
package main

import (
	"os"
	"time"

	"github.com/didi/gatekeeper/golang_common/zerolog"
)

func main() {
	d := time.Duration(10 * time.Second)

	log := zerolog.New(os.Stdout).With().
		Str("foo", "bar").
		Dur("dur", d).
		Logger()

	log.Log().Msg("hello world")

}
Output:

foo=bar||dur=10000||hello world
Example
d := time.Duration(10 * time.Second)

dst := bytes.Buffer{}
log := New(&dst).With().
	Str("foo", "bar").
	Dur("dur", d).
	Logger()

log.Log().Msg("hello world")

fmt.Println(decodeIfBinaryToString(dst.Bytes()))
Output:

foo=bar||dur=10000||hello world

func (Context) Durs

func (c Context) Durs(key string, d []time.Duration) Context

Durs adds the fields key with d divided by unit and stored as a float.

Example
d := []time.Duration{
	time.Duration(10 * time.Second),
	time.Duration(20 * time.Second),
}

dst := bytes.Buffer{}
log := New(&dst).With().
	Str("foo", "bar").
	Durs("durs", d).
	Logger()

log.Log().Msg("hello world")

fmt.Println(decodeIfBinaryToString(dst.Bytes()))
Output:

foo=bar||durs=[10000,20000]||hello world
Example
package main

import (
	"os"
	"time"

	"github.com/didi/gatekeeper/golang_common/zerolog"
)

func main() {
	d := []time.Duration{
		time.Duration(10 * time.Second),
		time.Duration(20 * time.Second),
	}

	log := zerolog.New(os.Stdout).With().
		Str("foo", "bar").
		Durs("durs", d).
		Logger()

	log.Log().Msg("hello world")

}
Output:

foo=bar||durs=[10000,20000]||hello world

func (Context) Err

func (c Context) Err(err error) Context

Err adds the field "error" with serialized err to the logger context.

func (Context) Fields

func (c Context) Fields(fields map[string]interface{}) Context

Fields is a helper function to use a map to set fields using type assertion.

func (Context) Float32

func (c Context) Float32(key string, f float32) Context

Float32 adds the field key with f as a float32 to the logger context.

func (Context) Float64

func (c Context) Float64(key string, f float64) Context

Float64 adds the field key with f as a float64 to the logger context.

func (Context) Floats32

func (c Context) Floats32(key string, f []float32) Context

Floats32 adds the field key with f as a []float32 to the logger context.

func (Context) Floats64

func (c Context) Floats64(key string, f []float64) Context

Floats64 adds the field key with f as a []float64 to the logger context.

func (Context) Hex

func (c Context) Hex(key string, val []byte) Context

Hex adds the field key with val as a hex string to the logger context.

func (Context) IPAddr

func (c Context) IPAddr(key string, ip net.IP) Context

IPAddr adds IPv4 or IPv6 Address to the context

Example
package main

import (
	"net"
	"os"

	"github.com/didi/gatekeeper/golang_common/zerolog"
)

func main() {
	hostIP := net.IP{192, 168, 0, 100}
	log := zerolog.New(os.Stdout).With().
		IPAddr("HostIP", hostIP).
		Logger()

	log.Log().Msg("hello world")

}
Output:

HostIP=192.168.0.100||hello world

func (Context) IPPrefix

func (c Context) IPPrefix(key string, pfx net.IPNet) Context

IPPrefix adds IPv4 or IPv6 Prefix (address and mask) to the context

Example
package main

import (
	"net"
	"os"

	"github.com/didi/gatekeeper/golang_common/zerolog"
)

func main() {
	route := net.IPNet{IP: net.IP{192, 168, 0, 0}, Mask: net.CIDRMask(24, 32)}
	log := zerolog.New(os.Stdout).With().
		IPPrefix("Route", route).
		Logger()

	log.Log().Msg("hello world")

}
Output:

Route=192.168.0.0/24||hello world

func (Context) Int

func (c Context) Int(key string, i int) Context

Int adds the field key with i as a int to the logger context.

func (Context) Int16

func (c Context) Int16(key string, i int16) Context

Int16 adds the field key with i as a int16 to the logger context.

func (Context) Int32

func (c Context) Int32(key string, i int32) Context

Int32 adds the field key with i as a int32 to the logger context.

func (Context) Int64

func (c Context) Int64(key string, i int64) Context

Int64 adds the field key with i as a int64 to the logger context.

func (Context) Int8

func (c Context) Int8(key string, i int8) Context

Int8 adds the field key with i as a int8 to the logger context.

func (Context) Interface

func (c Context) Interface(key string, i interface{}) Context

Interface adds the field key with obj marshaled using reflection.

Example
package main

import (
	"os"

	"github.com/didi/gatekeeper/golang_common/zerolog"
)

func main() {
	obj := struct {
		Name string `json:"name"`
	}{
		Name: "john",
	}

	log := zerolog.New(os.Stdout).With().
		Str("foo", "bar").
		Interface("obj", obj).
		Logger()

	log.Log().Msg("hello world")

}
Output:

foo=bar||obj={"name":"john"}||hello world
Example
obj := struct {
	Name string `json:"name"`
}{
	Name: "john",
}

dst := bytes.Buffer{}
log := New(&dst).With().
	Str("foo", "bar").
	Interface("obj", obj).
	Logger()

log.Log().Msg("hello world")

fmt.Println(decodeIfBinaryToString(dst.Bytes()))
Output:

foo=bar||obj={"name":"john"}||hello world

func (Context) Ints

func (c Context) Ints(key string, i []int) Context

Ints adds the field key with i as a []int to the logger context.

func (Context) Ints16

func (c Context) Ints16(key string, i []int16) Context

Ints16 adds the field key with i as a []int16 to the logger context.

func (Context) Ints32

func (c Context) Ints32(key string, i []int32) Context

Ints32 adds the field key with i as a []int32 to the logger context.

func (Context) Ints64

func (c Context) Ints64(key string, i []int64) Context

Ints64 adds the field key with i as a []int64 to the logger context.

func (Context) Ints8

func (c Context) Ints8(key string, i []int8) Context

Ints8 adds the field key with i as a []int8 to the logger context.

func (Context) Logger

func (c Context) Logger() Logger

Logger returns the logger with the context previously set.

func (Context) MACAddr

func (c Context) MACAddr(key string, ha net.HardwareAddr) Context

MACAddr adds MAC address to the context

func (Context) RawJSON

func (c Context) RawJSON(key string, b []byte) Context

RawJSON adds already encoded JSON to context.

No sanity check is performed on b; it must not contain carriage returns and be valid JSON.

func (Context) Str

func (c Context) Str(key, val string) Context

Str adds the field key with val as a string to the logger context.

func (Context) Strs

func (c Context) Strs(key string, vals []string) Context

Strs adds the field key with val as a string to the logger context.

func (Context) Time

func (c Context) Time(key string, t time.Time) Context

Time adds the field key with t formated as string using zerolog.TimeFieldFormat.

func (Context) Times

func (c Context) Times(key string, t []time.Time) Context

Times adds the field key with t formated as string using zerolog.TimeFieldFormat.

func (Context) Timestamp

func (c Context) Timestamp() Context

Timestamp adds the current local time as UNIX timestamp to the logger context with the "time" key. To customize the key name, change zerolog.TimestampFieldName.

NOTE: It won't dedupe the "time" key if the *Context has one already.

func (Context) Uint

func (c Context) Uint(key string, i uint) Context

Uint adds the field key with i as a uint to the logger context.

func (Context) Uint16

func (c Context) Uint16(key string, i uint16) Context

Uint16 adds the field key with i as a uint16 to the logger context.

func (Context) Uint32

func (c Context) Uint32(key string, i uint32) Context

Uint32 adds the field key with i as a uint32 to the logger context.

func (Context) Uint64

func (c Context) Uint64(key string, i uint64) Context

Uint64 adds the field key with i as a uint64 to the logger context.

func (Context) Uint8

func (c Context) Uint8(key string, i uint8) Context

Uint8 adds the field key with i as a uint8 to the logger context.

func (Context) Uints

func (c Context) Uints(key string, i []uint) Context

Uints adds the field key with i as a []uint to the logger context.

func (Context) Uints16

func (c Context) Uints16(key string, i []uint16) Context

Uints16 adds the field key with i as a []uint16 to the logger context.

func (Context) Uints32

func (c Context) Uints32(key string, i []uint32) Context

Uints32 adds the field key with i as a []uint32 to the logger context.

func (Context) Uints64

func (c Context) Uints64(key string, i []uint64) Context

Uints64 adds the field key with i as a []uint64 to the logger context.

func (Context) Uints8

func (c Context) Uints8(key string, i []uint8) Context

Uints8 adds the field key with i as a []uint8 to the logger context.

type Event

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

Event represents a log event. It is instanced by one of the level method of Logger and finalized by the Msg or Msgf method.

func (*Event) AnErr

func (e *Event) AnErr(key string, err error) *Event

AnErr adds the field key with serialized err to the *Event context. If err is nil, no field is added.

func (*Event) Bool

func (e *Event) Bool(key string, b bool) *Event

Bool adds the field key with val as a bool to the *Event context.

func (*Event) Bools

func (e *Event) Bools(key string, b []bool) *Event

Bools adds the field key with val as a []bool to the *Event context.

func (*Event) Bytes

func (e *Event) Bytes(key string, val []byte) *Event

Bytes adds the field key with val as a string to the *Event context.

Runes outside of normal ASCII ranges will be hex-encoded in the resulting JSON.

func (*Event) Caller

func (e *Event) Caller() *Event

Caller adds the file:line of the caller with the zerolog.CallerFieldName key.

func (*Event) CallerDefault

func (e *Event) CallerDefault(caller string) *Event

todo default caller

func (*Event) Discard

func (e *Event) Discard() *Event

Discard disables the event so Msg(f) won't print it.

func (*Event) Dur

func (e *Event) Dur(key string, d time.Duration) *Event

Dur adds the field key with duration d stored as zerolog.DurationFieldUnit. If zerolog.DurationFieldInteger is true, durations are rendered as integer instead of float.

Example
package main

import (
	"os"
	"time"

	"github.com/didi/gatekeeper/golang_common/zerolog"
)

func main() {
	d := time.Duration(10 * time.Second)

	log := zerolog.New(os.Stdout)

	log.Log().
		Str("foo", "bar").
		Dur("dur", d).
		Msg("hello world")

}
Output:

foo=bar||dur=10000||hello world
Example
d := time.Duration(10 * time.Second)

dst := bytes.Buffer{}
log := New(&dst)

log.Log().Tag(" undefined").
	Str("foo", "bar").
	Dur("dur", d).
	Msg("hello world")

fmt.Println(decodeIfBinaryToString(dst.Bytes()))
Output:

undefined||foo=bar||dur=10000||hello world

func (*Event) Durs

func (e *Event) Durs(key string, d []time.Duration) *Event

Durs adds the field key with duration d stored as zerolog.DurationFieldUnit. If zerolog.DurationFieldInteger is true, durations are rendered as integer instead of float.

Example
d := []time.Duration{
	time.Duration(10 * time.Second),
	time.Duration(20 * time.Second),
}

dst := bytes.Buffer{}
log := New(&dst)

log.Log().Tag(" undefined").
	Str("foo", "bar").
	Durs("durs", d).
	Msg("hello world")

fmt.Println(decodeIfBinaryToString(dst.Bytes()))
Output:

undefined||foo=bar||durs=[10000,20000]||hello world
Example
package main

import (
	"os"
	"time"

	"github.com/didi/gatekeeper/golang_common/zerolog"
)

func main() {
	d := []time.Duration{
		time.Duration(10 * time.Second),
		time.Duration(20 * time.Second),
	}

	log := zerolog.New(os.Stdout)

	log.Log().
		Str("foo", "bar").
		Durs("durs", d).
		Msg("hello world")

}
Output:

foo=bar||durs=[10000,20000]||hello world

func (*Event) Enabled

func (e *Event) Enabled() bool

Enabled return false if the *Event is going to be filtered out by log level or sampling.

func (*Event) Err

func (e *Event) Err(err error) *Event

Err adds the field "error" with serialized err to the *Event context. If err is nil, no field is added. To customize the key name, change zerolog.ErrorFieldName.

func (*Event) Fields

func (e *Event) Fields(fields map[string]interface{}) *Event

Fields is a helper function to use a map to set fields using type assertion.

func (*Event) Float32

func (e *Event) Float32(key string, f float32) *Event

Float32 adds the field key with f as a float32 to the *Event context.

func (*Event) Float64

func (e *Event) Float64(key string, f float64) *Event

Float64 adds the field key with f as a float64 to the *Event context.

func (*Event) Floats32

func (e *Event) Floats32(key string, f []float32) *Event

Floats32 adds the field key with f as a []float32 to the *Event context.

func (*Event) Floats64

func (e *Event) Floats64(key string, f []float64) *Event

Floats64 adds the field key with f as a []float64 to the *Event context.

func (*Event) Hex

func (e *Event) Hex(key string, val []byte) *Event

Hex adds the field key with val as a hex string to the *Event context.

func (*Event) IPAddr

func (e *Event) IPAddr(key string, ip net.IP) *Event

IPAddr adds IPv4 or IPv6 Address to the event

func (*Event) IPPrefix

func (e *Event) IPPrefix(key string, pfx net.IPNet) *Event

IPPrefix adds IPv4 or IPv6 Prefix (address and mask) to the event

func (*Event) Int

func (e *Event) Int(key string, i int) *Event

Int adds the field key with i as a int to the *Event context.

func (*Event) Int16

func (e *Event) Int16(key string, i int16) *Event

Int16 adds the field key with i as a int16 to the *Event context.

func (*Event) Int32

func (e *Event) Int32(key string, i int32) *Event

Int32 adds the field key with i as a int32 to the *Event context.

func (*Event) Int64

func (e *Event) Int64(key string, i int64) *Event

Int64 adds the field key with i as a int64 to the *Event context.

func (*Event) Int8

func (e *Event) Int8(key string, i int8) *Event

Int8 adds the field key with i as a int8 to the *Event context.

func (*Event) Interface

func (e *Event) Interface(key string, i interface{}) *Event

Interface adds the field key with i marshaled using reflection.

Example
package main

import (
	"os"

	"github.com/didi/gatekeeper/golang_common/zerolog"
)

func main() {
	log := zerolog.New(os.Stdout)

	obj := struct {
		Name string `json:"name"`
	}{
		Name: "john",
	}

	log.Log().
		Str("foo", "bar").
		Interface("obj", obj).
		Msg("hello world")

}
Output:

foo=bar||obj={"name":"john"}||hello world
Example
dst := bytes.Buffer{}
log := New(&dst)

obj := struct {
	Name string `json:"name"`
}{
	Name: "john",
}

log.Log().Tag(" undefined").
	Str("foo", "bar").
	Interface("obj", obj).
	Msg("hello world")

fmt.Println(decodeIfBinaryToString(dst.Bytes()))
Output:

undefined||foo=bar||obj={"name":"john"}||hello world

func (*Event) Ints

func (e *Event) Ints(key string, i []int) *Event

Ints adds the field key with i as a []int to the *Event context.

func (*Event) Ints16

func (e *Event) Ints16(key string, i []int16) *Event

Ints16 adds the field key with i as a []int16 to the *Event context.

func (*Event) Ints32

func (e *Event) Ints32(key string, i []int32) *Event

Ints32 adds the field key with i as a []int32 to the *Event context.

func (*Event) Ints64

func (e *Event) Ints64(key string, i []int64) *Event

Ints64 adds the field key with i as a []int64 to the *Event context.

func (*Event) Ints8

func (e *Event) Ints8(key string, i []int8) *Event

Ints8 adds the field key with i as a []int8 to the *Event context.

func (*Event) MACAddr

func (e *Event) MACAddr(key string, ha net.HardwareAddr) *Event

MACAddr adds MAC address to the event

func (*Event) Msg

func (e *Event) Msg(msg string)

Msg sends the *Event with msg added as the message field if not empty.

NOTICE: once this method is called, the *Event should be disposed. Calling Msg twice can have unexpected result.

func (*Event) Msgf

func (e *Event) Msgf(format string, v ...interface{})

Msgf sends the event with formated msg added as the message field if not empty.

NOTICE: once this methid is called, the *Event should be disposed. Calling Msg twice can have unexpected result.

func (*Event) RawJSON

func (e *Event) RawJSON(key string, b []byte) *Event

RawJSON adds already encoded JSON to the log line under key.

No sanity check is performed on b; it must not contain carriage returns and be valid JSON.

func (*Event) Str

func (e *Event) Str(key, val string) *Event

Str adds the field key with val as a string to the *Event context.

func (*Event) Strs

func (e *Event) Strs(key string, vals []string) *Event

Strs adds the field key with vals as a []string to the *Event context.

func (*Event) Tag

func (e *Event) Tag(key string) *Event

Tag adds the field key to the *Event context, wuthout separate flag

func (*Event) Time

func (e *Event) Time(key string, t time.Time) *Event

Time adds the field key with t formated as string using zerolog.TimeFieldFormat.

func (*Event) TimeDiff

func (e *Event) TimeDiff(key string, t time.Time, start time.Time) *Event

TimeDiff adds the field key with positive duration between time t and start. If time t is not greater than start, duration will be 0. Duration format follows the same principle as Dur().

func (*Event) Times

func (e *Event) Times(key string, t []time.Time) *Event

Times adds the field key with t formated as string using zerolog.TimeFieldFormat.

func (*Event) Timestamp

func (e *Event) Timestamp() *Event

Timestamp adds the current local time as UNIX timestamp to the *Event context with the "time" key. To customize the key name, change zerolog.TimestampFieldName.

NOTE: It won't dedupe the "time" key if the *Event (or *Context) has one already.

func (*Event) Uint

func (e *Event) Uint(key string, i uint) *Event

Uint adds the field key with i as a uint to the *Event context.

func (*Event) Uint16

func (e *Event) Uint16(key string, i uint16) *Event

Uint16 adds the field key with i as a uint16 to the *Event context.

func (*Event) Uint32

func (e *Event) Uint32(key string, i uint32) *Event

Uint32 adds the field key with i as a uint32 to the *Event context.

func (*Event) Uint64

func (e *Event) Uint64(key string, i uint64) *Event

Uint64 adds the field key with i as a uint64 to the *Event context.

func (*Event) Uint8

func (e *Event) Uint8(key string, i uint8) *Event

Uint8 adds the field key with i as a uint8 to the *Event context.

func (*Event) Uints

func (e *Event) Uints(key string, i []uint) *Event

Uints adds the field key with i as a []int to the *Event context.

func (*Event) Uints16

func (e *Event) Uints16(key string, i []uint16) *Event

Uints16 adds the field key with i as a []int16 to the *Event context.

func (*Event) Uints32

func (e *Event) Uints32(key string, i []uint32) *Event

Uints32 adds the field key with i as a []int32 to the *Event context.

func (*Event) Uints64

func (e *Event) Uints64(key string, i []uint64) *Event

Uints64 adds the field key with i as a []int64 to the *Event context.

func (*Event) Uints8

func (e *Event) Uints8(key string, i []uint8) *Event

Uints8 adds the field key with i as a []int8 to the *Event context.

type FileWriter

type FileWriter struct {
	AccessWriter
}

func NewFileWriter

func NewFileWriter(options ...Option) *FileWriter

NewFileWriter creates and initializes a new AccessWriter.

func (*FileWriter) WriteLevel

func (w *FileWriter) WriteLevel(l Level, p []byte) (n int, err error)

final write

type FormatWriter

type FormatWriter interface {
	FormatCaller(string) string
	FormatTimestamp() string
	FormatMessage(string) string
	FormatLevel(string) string
}

FormatWriter define format method

type Formatter

type Formatter func(interface{}) string

Formatter transforms the input into a formatted string.

type Hook

type Hook interface {
	// Run runs the hook with the event.
	Run(e *Event, level Level, message string)
}

Hook defines an interface to a log hook.

type HookFunc

type HookFunc func(e *Event, level Level, message string)

HookFunc is an adaptor to allow the use of an ordinary function as a Hook.

func (HookFunc) Run

func (h HookFunc) Run(e *Event, level Level, message string)

Run implements the Hook interface.

type Level

type Level uint8

Level defines log levels.

const (
	// DebugLevel defines debug log level.
	DebugLevel Level = iota
	// InfoLevel defines info log level.
	InfoLevel
	// WarnLevel defines warn log level.
	WarnLevel
	// ErrorLevel defines error log level.
	ErrorLevel
	// FatalLevel defines fatal log level.
	FatalLevel
	// PanicLevel defines panic log level.
	PanicLevel
	// NoLevel defines an absent log level.
	NoLevel
	// Disabled disables the logger.
	Disabled
)

func GlobalLevel

func GlobalLevel() Level

GlobalLevel returns the current global log level

func ParseLevel

func ParseLevel(levelStr string) (Level, error)

ParseLevel converts a level string into a zerolog Level value. returns an error if the input string does not match known values.

func (Level) String

func (l Level) String() string

type LevelHook

type LevelHook struct {
	NoLevelHook, DebugHook, InfoHook, WarnHook, ErrorHook, FatalHook, PanicHook Hook
}

LevelHook applies a different hook for each level.

func NewLevelHook

func NewLevelHook() LevelHook

NewLevelHook returns a new LevelHook.

func (LevelHook) Run

func (h LevelHook) Run(e *Event, level Level, message string)

Run implements the Hook interface.

type LevelSampler

type LevelSampler struct {
	DebugSampler, InfoSampler, WarnSampler, ErrorSampler Sampler
}

LevelSampler applies a different sampler for each level.

func (LevelSampler) Sample

func (s LevelSampler) Sample(lvl Level) bool

type LevelWriter

type LevelWriter interface {
	FormatWriter
	io.Writer
	WriteLevel(level Level, p []byte) (n int, err error)
}

LevelWriter defines as interface a writer may implement in order to receive level information with payload.

func MultiLevelWriter

func MultiLevelWriter(writers ...io.Writer) LevelWriter

MultiLevelWriter creates a writer that duplicates its writes to all the provided writers, similar to the Unix tee(1) command. If some writers implement LevelWriter, their WriteLevel method will be used instead of Write.

func SyslogLevelWriter

func SyslogLevelWriter(w SyslogWriter) LevelWriter

SyslogLevelWriter wraps a SyslogWriter and call the right syslog level method matching the zerolog level.

type Logger

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

A Logger represents an active logging object that generates lines of JSON output to an io.Writer. Each logging operation makes a single call to the Writer's Write method. There is no guaranty on access serialization to the Writer. If your Writer is not thread safe, you may consider a sync wrapper.

func Ctx

func Ctx(ctx context.Context) *Logger

Ctx returns the Logger associated with the ctx. If no logger is associated, a disabled logger is returned.

func New

func New(w io.Writer) Logger

New creates a root logger with given output writer. If the output writer implements the LevelWriter interface, the WriteLevel method will be called instead of the Write one.

Each logging operation makes a single call to the Writer's Write method. There is no guaranty on access serialization to the Writer. If your Writer is not thread safe, you may consider using sync wrapper.

Example
package main

import (
	"os"

	"github.com/didi/gatekeeper/golang_common/zerolog"
)

func main() {
	log := zerolog.New(os.Stdout)

	log.Info().Msg("hello world")
}
Output:

[INFO]||hello world

func Nop

func Nop() Logger

Nop returns a disabled logger for which all operation are no-op.

func (*Logger) Debug

func (l *Logger) Debug() *Event

Debug starts a new message with debug level.

You must call Msg on the returned event in order to send the event.

Example
package main

import (
	"os"

	"github.com/didi/gatekeeper/golang_common/zerolog"
)

func main() {
	log := zerolog.New(os.Stdout)

	log.Debug().
		Str("foo", "bar").
		Int("n", 123).
		Msg("hello world")

}
Output:

[DEBUG]||foo=bar||n=123||hello world
Example
dst := bytes.Buffer{}
log := New(&dst)

log.Debug().Tag(" undefined").
	Str("foo", "bar").
	Int("n", 123).
	Msg("hello world")

fmt.Println(decodeIfBinaryToString(dst.Bytes()))
Output:

[DEBUG] undefined||foo=bar||n=123||hello world

func (*Logger) Error

func (l *Logger) Error() *Event

Error starts a new message with error level.

You must call Msg on the returned event in order to send the event.

Example
package main

import (
	"errors"
	"os"

	"github.com/didi/gatekeeper/golang_common/zerolog"
)

func main() {
	log := zerolog.New(os.Stdout)

	log.Error().
		Err(errors.New("some error")).
		Msg("error doing something")

}
Output:

[ERROR]||error=some error||error doing something
Example
dst := bytes.Buffer{}
log := New(&dst)

log.Error().Tag(" undefined").
	Err(errors.New("some error")).
	Msg("error doing something")

fmt.Println(decodeIfBinaryToString(dst.Bytes()))
Output:

[ERROR] undefined||error=some error||error doing something

func (*Logger) Fatal

func (l *Logger) Fatal() *Event

Fatal starts a new message with fatal level. The os.Exit(1) function is called by the Msg method, which terminates the program immediately.

You must call Msg on the returned event in order to send the event.

func (*Logger) GetLevel

func (l *Logger) GetLevel() Level

GetLevel return the level of Logger

func (Logger) Hook

func (l Logger) Hook(h Hook) Logger

Hook returns a logger with the h Hook.

Example
package main

import (
	"os"

	"github.com/didi/gatekeeper/golang_common/zerolog"
)

type LevelNameHook struct{}

func (h LevelNameHook) Run(e *zerolog.Event, l zerolog.Level, msg string) {
	if l != zerolog.NoLevel {
		e.Str("level_name", l.String())
	} else {
		e.Str("level_name", "NoLevel")
	}
}

type MessageHook string

func (h MessageHook) Run(e *zerolog.Event, l zerolog.Level, msg string) {
	e.Str("the_message", msg)
}

func main() {
	var levelNameHook LevelNameHook
	var messageHook MessageHook = "The message"

	log := zerolog.New(os.Stdout).Hook(levelNameHook).Hook(messageHook)

	log.Info().Msg("hello world")

}
Output:

[INFO]||level_name=info||the_message=hello world||hello world
Example
var levelNameHook LevelNameHook1
var messageHook MessageHook = "The message"

dst := bytes.Buffer{}
log := New(&dst).Hook(levelNameHook).Hook(messageHook)

log.Info().Tag(" undefined").Msg("hello world")

fmt.Println(decodeIfBinaryToString(dst.Bytes()))
Output:

[INFO] undefined||level_name=info||the_message=hello world||hello world

func (*Logger) Info

func (l *Logger) Info() *Event

Info starts a new message with info level.

You must call Msg on the returned event in order to send the event.

Example
package main

import (
	"os"

	"github.com/didi/gatekeeper/golang_common/zerolog"
)

func main() {
	log := zerolog.New(os.Stdout)

	log.Info().
		Str("foo", "bar").
		Int("n", 123).
		Msg("hello world")

}
Output:

[INFO]||foo=bar||n=123||hello world
Example
dst := bytes.Buffer{}
log := New(&dst)

log.Info().Tag(" undefined").
	Str("foo", "bar").
	Int("n", 123).
	Msg("hello world")

fmt.Println(decodeIfBinaryToString(dst.Bytes()))
Output:

[INFO] undefined||foo=bar||n=123||hello world

func (Logger) Level

func (l Logger) Level(lvl Level) Logger

Level creates a child logger with the minimum accepted level set to level.

Example
package main

import (
	"os"

	"github.com/didi/gatekeeper/golang_common/zerolog"
)

func main() {
	log := zerolog.New(os.Stdout).Level(zerolog.WarnLevel)
	log.Info().Msg("filtered out message")
	log.Error().Msg("kept message")

}
Output:

[ERROR]||kept message
Example
dst := bytes.Buffer{}
log := New(&dst).Level(WarnLevel)

log.Info().Tag(" undefined").Msg("filtered out message")
log.Error().Tag(" undefined").Msg("kept message")

fmt.Println(decodeIfBinaryToString(dst.Bytes()))
Output:

[ERROR] undefined||kept message

func (*Logger) Log

func (l *Logger) Log() *Event

Log starts a new message with no level. Setting GlobalLevel to Disabled will still disable events produced by this method.

You must call Msg on the returned event in order to send the event.

Example
package main

import (
	"os"

	"github.com/didi/gatekeeper/golang_common/zerolog"
)

func main() {
	log := zerolog.New(os.Stdout)

	log.Log().
		Str("foo", "bar").
		Str("bar", "baz").
		Msg("")

}
Output:

foo=bar||bar=baz
Example
dst := bytes.Buffer{}
log := New(&dst)

log.Log().Tag(" undefined").
	Str("foo", "bar").
	Str("bar", "baz").
	Msg("")

fmt.Println(decodeIfBinaryToString(dst.Bytes()))
Output:

undefined||foo=bar||bar=baz

func (Logger) Output

func (l Logger) Output(w io.Writer) Logger

Output duplicates the current logger and sets w as its output.

func (*Logger) Panic

func (l *Logger) Panic() *Event

Panic starts a new message with panic level. The panic() function is called by the Msg method, which stops the ordinary flow of a goroutine.

You must call Msg on the returned event in order to send the event.

func (*Logger) Print

func (l *Logger) Print(v ...interface{})

Print sends a log event using debug level and no extra field. Arguments are handled in the manner of fmt.Print.

Example
dst := bytes.Buffer{}
log := New(&dst)

log.Print("hello world")

fmt.Println(decodeIfBinaryToString(dst.Bytes()))
Output:

[DEBUG]||hello world
Example
package main

import (
	"os"

	"github.com/didi/gatekeeper/golang_common/zerolog"
)

func main() {
	log := zerolog.New(os.Stdout)

	log.Print("hello world")

}
Output:

[DEBUG]||hello world

func (*Logger) Printf

func (l *Logger) Printf(format string, v ...interface{})

Printf sends a log event using debug level and no extra field. Arguments are handled in the manner of fmt.Printf.

Example
dst := bytes.Buffer{}
log := New(&dst)

log.Printf("hello %s", "world")

fmt.Println(decodeIfBinaryToString(dst.Bytes()))
Output:

[DEBUG]||hello world
Example
package main

import (
	"os"

	"github.com/didi/gatekeeper/golang_common/zerolog"
)

func main() {
	log := zerolog.New(os.Stdout)

	log.Printf("hello %s", "world")

}
Output:

[DEBUG]||hello world

func (Logger) Sample

func (l Logger) Sample(s Sampler) Logger

Sample returns a logger with the s sampler.

Example
dst := bytes.Buffer{}
log := New(&dst).Sample(&BasicSampler{N: 2})

log.Info().Msg("message 1")
log.Info().Msg("message 2")
log.Info().Msg("message 3")
log.Info().Msg("message 4")

fmt.Println(decodeIfBinaryToString(dst.Bytes()))
Output:

[INFO]||message 1
[INFO]||message 3
Example
package main

import (
	"os"

	"github.com/didi/gatekeeper/golang_common/zerolog"
)

func main() {
	log := zerolog.New(os.Stdout).Sample(&zerolog.BasicSampler{N: 2})

	log.Info().Msg("message 1")
	log.Info().Msg("message 2")
	log.Info().Msg("message 3")
	log.Info().Msg("message 4")

}
Output:

[INFO]||message 1
[INFO]||message 3

func (*Logger) UpdateContext

func (l *Logger) UpdateContext(update func(c Context) Context)

UpdateContext updates the internal logger's context.

Use this method with caution. If unsure, prefer the With method.

func (*Logger) Warn

func (l *Logger) Warn() *Event

Warn starts a new message with warn level.

You must call Msg on the returned event in order to send the event.

Example
dst := bytes.Buffer{}
log := New(&dst)

log.Warn().Tag(" undefined").
	Str("foo", "bar").
	Msg("a warning message")

fmt.Println(decodeIfBinaryToString(dst.Bytes()))
// [WARNING] undefined||foo=bar||a warning message
Output:

Example
package main

import (
	"os"

	"github.com/didi/gatekeeper/golang_common/zerolog"
)

func main() {
	log := zerolog.New(os.Stdout)

	log.Warn().
		Str("foo", "bar").
		Msg("a warning message")

}
Output:

[WARNING]||foo=bar||a warning message

func (Logger) With

func (l Logger) With() Context

With creates a child logger with the field added to its context.

func (*Logger) WithContext

func (l *Logger) WithContext(ctx context.Context) context.Context

WithContext returns a copy of ctx with l associated. If an instance of Logger is already in the context, the context is not updated.

For instance, to add a field to an existing logger in the context, use this notation:

ctx := r.Context()
l := zerolog.Ctx(ctx)
l.UpdateContext(func(c Context) Context {
    return c.Str("bar", "baz")
})

func (*Logger) WithLevel

func (l *Logger) WithLevel(level Level) *Event

WithLevel starts a new message with level. Unlike Fatal and Panic methods, WithLevel does not terminate the program or stop the ordinary flow of a gourotine when used with their respective levels.

You must call Msg on the returned event in order to send the event.

Example
dst := bytes.Buffer{}
log := New(&dst)

log.WithLevel(InfoLevel).Tag(" undefined").
	Msg("hello world")

fmt.Println(decodeIfBinaryToString(dst.Bytes()))
Output:

[INFO] undefined||hello world
Example
package main

import (
	"os"

	"github.com/didi/gatekeeper/golang_common/zerolog"
)

func main() {
	log := zerolog.New(os.Stdout)

	log.WithLevel(zerolog.InfoLevel).
		Msg("hello world")

}
Output:

[INFO]||hello world

func (Logger) Write

func (l Logger) Write(p []byte) (n int, err error)

Write implements the io.Writer interface. This is useful to set as a writer for the standard library log.

Example
dst := bytes.Buffer{}
log := New(&dst).With().
	Str("foo", "bar").
	Logger()

stdlog.SetFlags(0)
stdlog.SetOutput(log)

stdlog.Print("hello world")

fmt.Println(decodeIfBinaryToString(dst.Bytes()))
Output:

foo=bar||hello world
Example
package main

import (
	stdlog "log"
	"os"

	"github.com/didi/gatekeeper/golang_common/zerolog"
)

func main() {
	log := zerolog.New(os.Stdout).With().
		Str("foo", "bar").
		Logger()

	stdlog.SetFlags(0)
	stdlog.SetOutput(log)

	stdlog.Print("hello world")

}
Output:

foo=bar||hello world

type Option

type Option func(w *AccessWriter)

func SetAutoClear

func SetAutoClear(isAutoClear bool) Option

func SetClearHours

func SetClearHours(hours int32) Option

func SetClearSteps

func SetClearSteps(steps int32) Option
func SetDisableLink(disableLink bool) Option

func SetFileDir

func SetFileDir(dir string) Option

func SetFilePrefix

func SetFilePrefix(prefix string) Option

type RandomSampler

type RandomSampler uint32

RandomSampler use a PRNG to randomly sample an event out of N events, regardless of their level.

func (RandomSampler) Sample

func (s RandomSampler) Sample(lvl Level) bool

Sample implements the Sampler interface.

type Sampler

type Sampler interface {
	// Sample returns true if the event should be part of the sample, false if
	// the event should be dropped.
	Sample(lvl Level) bool
}

Sampler defines an interface to a log sampler.

type StdoutWriter

type StdoutWriter struct {
	AccessWriter
}

func NewStdoutWriter

func NewStdoutWriter(options ...Option) *StdoutWriter

NewStdoutWriter will write to stdout.

func (*StdoutWriter) WriteLevel

func (w *StdoutWriter) WriteLevel(l Level, p []byte) (n int, err error)

type SyslogWriter

type SyslogWriter interface {
	io.Writer
	Debug(m string) error
	Info(m string) error
	Warning(m string) error
	Err(m string) error
	Emerg(m string) error
	Crit(m string) error
}

SyslogWriter is an interface matching a syslog.Writer struct.

type WFFileWriter

type WFFileWriter struct {
	AccessWriter
}

func NewWFFileWriter

func NewWFFileWriter(options ...Option) *WFFileWriter

NewFileWriter creates and initializes a new AccessWriter.

func (*WFFileWriter) WriteLevel

func (w *WFFileWriter) WriteLevel(l Level, p []byte) (n int, err error)

Directories

Path Synopsis
cmd
Package diode provides a thread-safe, lock-free, non-blocking io.Writer wrapper.
Package diode provides a thread-safe, lock-free, non-blocking io.Writer wrapper.
Package hlog provides a set of http.Handler helpers for zerolog.
Package hlog provides a set of http.Handler helpers for zerolog.
internal
cbor
Package cbor provides primitives for storing different data in the CBOR (binary) format.
Package cbor provides primitives for storing different data in the CBOR (binary) format.
ordered
Package ordered provided a type OrderedMap for use in JSON handling
Package ordered provided a type OrderedMap for use in JSON handling
Package log provides a global logger for zerolog.
Package log provides a global logger for zerolog.

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