logger.go

package scimpatch

import "context"

type PatcherLogger interface {
	Error(args ...interface{})
	Debug(args ...interface{})
}

type noopPatcherLogger struct{}

func (l noopPatcherLogger) Error(args ...interface{}) {}
func (l noopPatcherLogger) Debug(args ...interface{}) {}

var noop = noopPatcherLogger{}

type loggerKey struct{}

// key is the context key for the logger.
var key = loggerKey{}

// AddLogger adds a logger to the context.
// If the context already has a logger, AddLogger will overwrite it.
// If the logger is nil, AddLogger will add a no-op logger.
// The logger used by the Patcher.
func AddLogger(ctx context.Context, logger PatcherLogger) context.Context {
	return context.WithValue(ctx, key, logger)
}

func getLogger(ctx context.Context) PatcherLogger {
	l, ok := ctx.Value(key).(PatcherLogger)
	if !ok {
		return noop
	}
	return l
}