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added better logging

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# Zerologr
[![Go Reference](https://pkg.go.dev/badge/github.com/go-logr/zerologr.svg)](https://pkg.go.dev/github.com/go-logr/zerologr)
![test](https://github.com/go-logr/zerologr/workflows/test/badge.svg)
[![Go Report Card](https://goreportcard.com/badge/github.com/go-logr/zerologr)](https://goreportcard.com/report/github.com/go-logr/zerologr)
A [logr](https://github.com/go-logr/logr) LogSink implementation using [Zerolog](https://github.com/rs/zerolog).
## Usage
```go
import (
"os"
"github.com/go-logr/logr"
"github.com/go-logr/zerologr"
"github.com/rs/zerolog"
)
func main() {
zerolog.TimeFieldFormat = zerolog.TimeFormatUnixMs
zerologr.NameFieldName = "logger"
zerologr.NameSeparator = "/"
zl := zerolog.New(os.Stderr)
zl = zl.With().Caller().Timestamp().Logger()
var log logr.Logger = zerologr.New(&zl)
log.Info("Logr in action!", "the answer", 42)
}
```
## Implementation Details
For the most part, concepts in Zerolog correspond directly with those in logr.
Levels in logr correspond to custom debug levels in Zerolog. Any given level
in logr is represents by `zerologLevel = 1 - logrLevel`.
For example `V(2)` is equivalent to Zerolog's `TraceLevel`, while `V(1)` is
equivalent to Zerolog's `DebugLevel`.

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// Package zerologr defines an implementation of the github.com/go-logr/logr
// interfaces built on top of Zerolog (https://github.com/rs/zerolog).
//
// Usage
//
// A new logr.Logger can be constructed from an existing zerolog.Logger using
// the New function:
//
// log := zerologr.New(someZeroLogger)
//
// Implementation Details
//
// For the most part, concepts in Zerolog correspond directly with those in
// logr.
//
// Levels in logr correspond to custom debug levels in Zerolog. Any given level
// in logr is represents by `zerologLevel = 1 - logrLevel`.
// For example V(2) is equivalent to Zerolog's TraceLevel, while V(1) is
// equivalent to Zerolog's DebugLevel. Verbosity value is a number and is only
// logged on Info(), not Error().
package zerologr
import (
"fmt"
"github.com/go-logr/logr"
"github.com/rs/zerolog"
)
var (
// NameFieldName is the field key for logr.WithName.
NameFieldName = "logger"
// NameSeparator separates names for logr.WithName.
NameSeparator = "/"
// VerbosityFieldName is the field key for logr.Info verbosity. If set to "",
// its value is not emitted.
VerbosityFieldName = "v"
// RenderArgsHook mutates the list of key-value pairs passed directly to
// logr.Info and logr.Error.
RenderArgsHook = DefaultRender
// RenderValuesHook mutates the list of key-value pairs saved via logr.WithValues.
RenderValuesHook = DefaultRender
)
// Logger is type alias of logr.Logger.
type Logger = logr.Logger
// LogSink implements logr.LogSink and logr.CallDepthLogSink.
type LogSink struct {
l *zerolog.Logger
name string
depth int
}
// Underlier exposes access to the underlying logging implementation. Since
// callers only have a logr.Logger, they have to know which implementation is
// in use, so this interface is less of an abstraction and more of way to test
// type conversion.
type Underlier interface {
GetUnderlying() *zerolog.Logger
}
var (
_ logr.LogSink = &LogSink{}
_ logr.CallDepthLogSink = &LogSink{}
)
// New returns a logr.Logger with logr.LogSink implemented by Zerolog.
func New(l *zerolog.Logger) Logger {
ls := NewLogSink(l)
return logr.New(ls)
}
// NewLogSink returns a logr.LogSink implemented by Zerolog.
func NewLogSink(l *zerolog.Logger) *LogSink {
return &LogSink{l: l}
}
// Init receives runtime info about the logr library.
func (ls *LogSink) Init(ri logr.RuntimeInfo) {
ls.depth = ri.CallDepth + 2
}
// Enabled tests whether this LogSink is enabled at the specified V-level.
func (ls *LogSink) Enabled(level int) bool {
// Optimization: Info() will check level internally.
const traceLevel = 1 - int(zerolog.TraceLevel)
return level <= traceLevel
}
// Info logs a non-error message at specified V-level with the given key/value pairs as context.
func (ls *LogSink) Info(level int, msg string, keysAndValues ...interface{}) {
e := ls.l.WithLevel(zerolog.Level(1 - level))
if VerbosityFieldName != "" {
e.Int(VerbosityFieldName, level)
}
ls.msg(e, msg, keysAndValues)
}
// Error logs an error, with the given message and key/value pairs as context.
func (ls *LogSink) Error(err error, msg string, keysAndValues ...interface{}) {
e := ls.l.Error().Err(err)
ls.msg(e, msg, keysAndValues)
}
func (ls *LogSink) msg(e *zerolog.Event, msg string, keysAndValues []interface{}) {
if e == nil {
return
}
if ls.name != "" {
e.Str(NameFieldName, ls.name)
}
if RenderArgsHook != nil {
keysAndValues = RenderArgsHook(keysAndValues)
}
e = e.Fields(keysAndValues)
e.CallerSkipFrame(ls.depth)
e.Msg(msg)
}
// WithValues returns a new LogSink with additional key/value pairs.
func (ls LogSink) WithValues(keysAndValues ...interface{}) logr.LogSink {
if RenderValuesHook != nil {
keysAndValues = RenderValuesHook(keysAndValues)
}
l := ls.l.With().Fields(keysAndValues).Logger()
ls.l = &l
return &ls
}
// WithName returns a new LogSink with the specified name appended in NameFieldName.
// Name elements are separated by NameSeparator.
func (ls LogSink) WithName(name string) logr.LogSink {
if ls.name != "" {
ls.name += NameSeparator + name
} else {
ls.name = name
}
return &ls
}
// WithCallDepth returns a new LogSink that offsets the call stack by adding specified depths.
func (ls LogSink) WithCallDepth(depth int) logr.LogSink {
ls.depth += depth
return &ls
}
// GetUnderlying returns the zerolog.Logger underneath this logSink.
func (ls *LogSink) GetUnderlying() *zerolog.Logger {
return ls.l
}
// DefaultRender supports logr.Marshaler and fmt.Stringer.
func DefaultRender(keysAndValues []interface{}) []interface{} {
for i, n := 1, len(keysAndValues); i < n; i += 2 {
value := keysAndValues[i]
switch v := value.(type) {
case logr.Marshaler:
keysAndValues[i] = v.MarshalLog()
case fmt.Stringer:
keysAndValues[i] = v.String()
}
}
return keysAndValues
}