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logger.go
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logger.go
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package logr
import (
"fmt"
"os"
"log/slog"
"github.com/go-logr/logr"
"github.com/spf13/pflag"
)
type (
Config struct {
Verbosity int
Format string
}
Format string
)
const (
DefaultFormat Format = "default"
TextFormat Format = "text"
JSONFormat Format = "json"
)
// NewConfigFromFlags adds flags to the given flagset, and, after the
// flagset is parsed by the caller, the flags populate the returned logger
// config.
func NewConfigFromFlags(flags *pflag.FlagSet) *Config {
cfg := Config{}
flags.IntVarP(&cfg.Verbosity, "v", "v", 0, "Logging level")
flags.StringVar(&cfg.Format, "log-format", string(DefaultFormat), "Logging format: text or json")
return &cfg
}
// New constructs a new logger that satisfies the logr interface
func New(cfg *Config) (logr.Logger, error) {
var h slog.Handler
level := toSlogLevel(cfg.Verbosity)
switch Format(cfg.Format) {
case DefaultFormat:
h = NewLevelHandler(level, slog.Default().Handler())
case TextFormat:
h = slog.NewTextHandler(os.Stdout, &slog.HandlerOptions{Level: level})
case JSONFormat:
h = slog.NewJSONHandler(os.Stdout, &slog.HandlerOptions{Level: level})
default:
return logr.Logger{}, fmt.Errorf("unrecognised logging format: %s", cfg.Format)
}
return logr.New(newLogSink(h)), nil
}
// toSlogLevel converts a logr v-level to a slog level.
func toSlogLevel(verbosity int) slog.Level {
if verbosity <= 0 {
return slog.LevelInfo
}
return slog.Level(-4 - (verbosity - 1))
}