func ReadInfoForRef(basefile string, ref string) (interface{}, error) {
	initializeInfoCache()
	{
		info, ok := infoCache[ref]
		if ok {
			if verboseReader {
				log.Printf("Cache hit for ref %s#%s", basefile, ref)
			}
			return info, nil
		}
	}
	if verboseReader {
		log.Printf("Reading info for ref %s#%s", basefile, ref)
	}
	count = count + 1
	basedir, _ := filepath.Split(basefile)
	parts := strings.Split(ref, "#")
	var filename string
	if parts[0] != "" {
		filename = basedir + parts[0]
	} else {
		filename = basefile
	}
	bytes, err := ReadBytesForFile(filename)
	if err != nil {
		return nil, err
	}
	info, err := ReadInfoFromBytes(filename, bytes)
	if err != nil {
		log.Printf("File error: %v\n", err)
	} else {
		if len(parts) > 1 {
			path := strings.Split(parts[1], "/")
			for i, key := range path {
				if i > 0 {
					m, ok := info.(yaml.MapSlice)
					if ok {
						found := false
						for _, section := range m {
							if section.Key == key {
								info = section.Value
								found = true
							}
						}
						if !found {
							infoCache[ref] = nil
							return nil, NewError(nil, fmt.Sprintf("could not resolve %s", ref))
						}
					}
				}
			}
		}
	}
	infoCache[ref] = info
	return info, nil
}
ReadInfoForRef reads a file and return the fragment needed to resolve a $ref.
package compiler
import (
	"fmt"
	"gopkg.in/yaml.v2"
	"io/ioutil"
	"log"
	"net/http"
	"net/url"
	"path/filepath"
	"strings"
)
var fileCache map[string][]byte
var infoCache map[string]interface{}
var count int64
var verboseReader = false
func initializeFileCache() {
	if fileCache == nil {
		fileCache = make(map[string][]byte, 0)
	}
}
func initializeInfoCache() {
	if infoCache == nil {
		infoCache = make(map[string]interface{}, 0)
	}
}
func FetchFile(fileurl string) ([]byte, error) {
	initializeFileCache()
	bytes, ok := fileCache[fileurl]
	if ok {
		if verboseReader {
			log.Printf("Cache hit %s", fileurl)
		}
		return bytes, nil
	}
	log.Printf("Fetching %s", fileurl)
	response, err := http.Get(fileurl)
	if err != nil {
		return nil, err
	}
	defer response.Body.Close()
	bytes, err = ioutil.ReadAll(response.Body)
	if err == nil {
		fileCache[fileurl] = bytes
	}
	return bytes, err
}
func ReadBytesForFile(filename string) ([]byte, error) {
	fileurl, _ := url.Parse(filename)
	if fileurl.Scheme != "" {
		bytes, err := FetchFile(filename)
		if err != nil {
			return nil, err
		}
		return bytes, nil
	}
	bytes, err := ioutil.ReadFile(filename)
	if err != nil {
		return nil, err
	}
	return bytes, nil
}
func ReadInfoFromBytes(filename string, bytes []byte) (interface{}, error) {
	initializeInfoCache()
	cachedInfo, ok := infoCache[filename]
	if ok {
		if verboseReader {
			log.Printf("Cache hit info for file %s", filename)
		}
		return cachedInfo, nil
	}
	if verboseReader {
		log.Printf("Reading info for file %s", filename)
	}
	var info yaml.MapSlice
	err := yaml.Unmarshal(bytes, &info)
	if err != nil {
		return nil, err
	}
	infoCache[filename] = info
	return info, nil
}