package apm

import (
	"github.com/SkyAPM/go2sky/propagation"
	"net/http"
)

func HttpExtractor(req *http.Request) propagation.Extractor {
	return func() (s string, e error) {
		if req == nil || req.Header == nil {
			return "", nil
		}
		return req.Header.Get(propagation.Header), nil
	}
}

func HttpInjector(req *http.Request) propagation.Injector {
	return func(header string) error {
		if req == nil || req.Header == nil {
			return nil
		}
		req.Header.Set(propagation.Header, header)
		return nil
	}
}