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default.go
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default.go
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// Copyright 2022 Juan Pablo Tosso and the OWASP Coraza contributors
// SPDX-License-Identifier: Apache-2.0
package debuglog
import (
"fmt"
"io"
"log"
"os"
"strconv"
)
type defaultEvent struct {
level Level
printer Printer
fields []byte
}
func (e *defaultEvent) Msg(msg string) {
if len(msg) == 0 {
return
}
if len(e.fields) == 0 {
e.printer(e.level, msg, "")
} else {
// if event has fields, there serialization starts with a
// trailing space.
e.printer(e.level, msg, string(e.fields[1:]))
}
}
func (e *defaultEvent) Str(key, val string) Event {
e.fields = append(e.fields, ' ')
e.fields = append(e.fields, key...)
e.fields = append(e.fields, '=')
e.fields = append(e.fields, strconv.Quote(val)...)
return e
}
func (e *defaultEvent) Err(err error) Event {
if err == nil {
return e
}
e.fields = append(e.fields, " error=\""...)
e.fields = append(e.fields, err.Error()...)
e.fields = append(e.fields, '"')
return e
}
func (e *defaultEvent) Bool(key string, b bool) Event {
e.fields = append(e.fields, ' ')
e.fields = append(e.fields, key...)
e.fields = append(e.fields, '=')
if b {
e.fields = append(e.fields, "true"...)
} else {
e.fields = append(e.fields, "false"...)
}
return e
}
func (e *defaultEvent) Int(key string, i int) Event {
e.fields = append(e.fields, ' ')
e.fields = append(e.fields, key...)
e.fields = append(e.fields, '=')
e.fields = append(e.fields, strconv.Itoa(i)...)
return e
}
func (e *defaultEvent) Uint(key string, i uint) Event {
e.fields = append(e.fields, ' ')
e.fields = append(e.fields, key...)
e.fields = append(e.fields, '=')
e.fields = append(e.fields, strconv.Itoa(int(i))...)
return e
}
func (e *defaultEvent) Stringer(key string, val fmt.Stringer) Event {
return e.Str(key, val.String())
}
func (defaultEvent) IsEnabled() bool {
return true
}
type defaultLogger struct {
printer Printer
factory PrinterFactory
level Level
defaultFields []byte
}
func (l defaultLogger) WithOutput(w io.Writer) Logger {
return defaultLogger{
printer: l.factory(w),
factory: l.factory,
level: l.level,
defaultFields: l.defaultFields,
}
}
func (l defaultLogger) WithLevel(lvl Level) Logger {
return defaultLogger{
printer: l.printer,
factory: l.factory,
level: lvl,
defaultFields: l.defaultFields,
}
}
func (l defaultLogger) With(fs ...ContextField) Logger {
var e Event = &defaultEvent{}
for _, f := range fs {
e = f(e)
}
return defaultLogger{
printer: l.printer,
factory: l.factory,
level: l.level,
defaultFields: append(l.defaultFields, e.(*defaultEvent).fields...),
}
}
func (l defaultLogger) Trace() Event {
if l.level < LevelTrace {
return noopEvent{}
}
return &defaultEvent{printer: l.printer, level: LevelTrace, fields: l.defaultFields}
}
func (l defaultLogger) Debug() Event {
if l.level < LevelDebug {
return noopEvent{}
}
return &defaultEvent{printer: l.printer, level: LevelDebug, fields: l.defaultFields}
}
func (l defaultLogger) Info() Event {
if l.level < LevelInfo {
return noopEvent{}
}
return &defaultEvent{printer: l.printer, level: LevelInfo, fields: l.defaultFields}
}
func (l defaultLogger) Warn() Event {
if l.level < LevelWarn {
return noopEvent{}
}
return &defaultEvent{printer: l.printer, level: LevelWarn, fields: l.defaultFields}
}
func (l defaultLogger) Error() Event {
if l.level < LevelError {
return noopEvent{}
}
return &defaultEvent{printer: l.printer, level: LevelError, fields: l.defaultFields}
}
// Default returns a default logger that writes to stderr.
func Default() Logger {
return DefaultWithPrinterFactory(defaultPrinterFactory)
}
type Printer func(lvl Level, message, fields string)
type PrinterFactory func(w io.Writer) Printer
var defaultPrinterFactory = func(w io.Writer) Printer {
l := log.New(w, "", log.LstdFlags)
return func(lvl Level, message, fields string) {
l.Printf("[%s] %s %s", lvl.String(), message, fields)
}
}
// DefaultWithPrinterFactory returns a default logger that writes to stderr with a given
// printer factory. It is useful when you need to abstract the printer.
func DefaultWithPrinterFactory(f PrinterFactory) Logger {
return defaultLogger{
printer: f(os.Stderr),
factory: f,
level: LevelInfo,
}
}