initialize: add standalone initialization functions

Signed-off-by: Hank Donnay <hdonnay@redhat.com>

initialize/logging.go

@@ -7,6 +7,8 @@ import (
 
 	"github.com/rs/zerolog"
 	"github.com/rs/zerolog/log"
+
+	"github.com/quay/clair/v4/config"
 )
 
 // Logging will set the global logging level for Clair,
@@ -26,6 +28,7 @@ func (i *Init) Logging() error {
 	return nil
 }
 
+// LogLevel does a string-to-level mapping.
 func LogLevel(level string) zerolog.Level {
 	level = strings.ToLower(level)
 	switch level {
@@ -49,3 +52,13 @@ func LogLevel(level string) zerolog.Level {
 		return zerolog.InfoLevel
 	}
 }
+
+// Logging configures a logger according to the provided configuration and returns
+// a configured Context.
+func Logging(ctx context.Context, cfg *config.Config) (context.Context, error) {
+	zerolog.SetGlobalLevel(LogLevel(cfg.LogLevel))
+	l := log.With().Timestamp().Logger()
+	ctx = l.WithContext(ctx)
+	l.Debug().Str("component", "initialize/Logging").Msg("logging initialized")
+	return ctx, nil
+}