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logger.go
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logger.go
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package log
import (
"fmt"
"io"
"sort"
"sync"
"github.com/charmbracelet/lipgloss"
)
// Styles mapping.
var Styles = [...]lipgloss.Style{
DebugLevel: lipgloss.NewStyle().Foreground(lipgloss.Color("15")).Bold(true),
InfoLevel: lipgloss.NewStyle().Foreground(lipgloss.Color("12")).Bold(true),
WarnLevel: lipgloss.NewStyle().Foreground(lipgloss.Color("11")).Bold(true),
ErrorLevel: lipgloss.NewStyle().Foreground(lipgloss.Color("9")).Bold(true),
FatalLevel: lipgloss.NewStyle().Foreground(lipgloss.Color("9")).Bold(true),
}
// Strings mapping.
var Strings = [...]string{
DebugLevel: "•",
InfoLevel: "•",
WarnLevel: "•",
ErrorLevel: "⨯",
FatalLevel: "⨯",
}
const defaultPadding = 2
// assert interface compliance.
var _ Interface = (*Logger)(nil)
// Fielder is an interface for providing fields to custom types.
type Fielder interface {
Fields() Fields
}
// Fields represents a map of entry level data used for structured logging.
type Fields map[string]interface{}
// Fields implements Fielder.
func (f Fields) Fields() Fields {
return f
}
// Get field value by name.
func (f Fields) Get(name string) interface{} {
return f[name]
}
// Names returns field names sorted.
func (f Fields) Names() (v []string) {
for k := range f {
v = append(v, k)
}
sort.Strings(v)
return
}
// Logger represents a logger with configurable Level and Handler.
type Logger struct {
mu sync.Mutex
Writer io.Writer
Level Level
Padding int
}
// ResetPadding resets the padding to default.
func (l *Logger) ResetPadding() {
l.Padding = defaultPadding
}
// IncreasePadding increases the padding 1 times.
func (l *Logger) IncreasePadding() {
l.Padding += defaultPadding
}
// DecreasePadding decreases the padding 1 times.
func (l *Logger) DecreasePadding() {
l.Padding -= defaultPadding
}
func (l *Logger) handleLog(e *Entry) {
style := Styles[e.Level]
level := Strings[e.Level]
names := e.Fields.Names()
l.mu.Lock()
defer l.mu.Unlock()
fmt.Fprintf(
l.Writer,
"%s %-*s",
style.Render(fmt.Sprintf("%*s", 1+e.Padding, level)),
l.rightPadding(names, e.Padding),
e.Message,
)
for _, name := range names {
fmt.Fprintf(l.Writer, " %s=%v", style.Render(name), e.Fields.Get(name))
}
fmt.Fprintln(l.Writer)
}
func (l *Logger) rightPadding(names []string, padding int) int {
if len(names) == 0 {
return 0
}
return 50 - padding
}
// WithFields returns a new entry with `fields` set.
func (l *Logger) WithFields(fields Fielder) *Entry {
return NewEntry(l).WithFields(fields.Fields())
}
// WithField returns a new entry with the `key` and `value` set.
//
// Note that the `key` should not have spaces in it - use camel
// case or underscores
func (l *Logger) WithField(key string, value interface{}) *Entry {
return NewEntry(l).WithField(key, value)
}
// WithError returns a new entry with the "error" set to `err`.
func (l *Logger) WithError(err error) *Entry {
return NewEntry(l).WithError(err)
}
// WithoutPadding returns a new entry with padding set to default.
func (l *Logger) WithoutPadding() *Entry {
return NewEntry(l).WithoutPadding()
}
// Debug level message.
func (l *Logger) Debug(msg string) {
NewEntry(l).Debug(msg)
}
// Info level message.
func (l *Logger) Info(msg string) {
NewEntry(l).Info(msg)
}
// Warn level message.
func (l *Logger) Warn(msg string) {
NewEntry(l).Warn(msg)
}
// Error level message.
func (l *Logger) Error(msg string) {
NewEntry(l).Error(msg)
}
// Fatal level message, followed by an exit.
func (l *Logger) Fatal(msg string) {
NewEntry(l).Fatal(msg)
}
// Debugf level formatted message.
func (l *Logger) Debugf(msg string, v ...interface{}) {
NewEntry(l).Debugf(msg, v...)
}
// Infof level formatted message.
func (l *Logger) Infof(msg string, v ...interface{}) {
NewEntry(l).Infof(msg, v...)
}
// Warnf level formatted message.
func (l *Logger) Warnf(msg string, v ...interface{}) {
NewEntry(l).Warnf(msg, v...)
}
// Errorf level formatted message.
func (l *Logger) Errorf(msg string, v ...interface{}) {
NewEntry(l).Errorf(msg, v...)
}
// Fatalf level formatted message, followed by an exit.
func (l *Logger) Fatalf(msg string, v ...interface{}) {
NewEntry(l).Fatalf(msg, v...)
}
// log the message, invoking the handler. We clone the entry here
// to bypass the overhead in Entry methods when the level is not
// met.
func (l *Logger) log(level Level, e *Entry, msg string) {
if level < l.Level {
return
}
l.handleLog(e.finalize(level, msg))
}