Golang ParseAsV2_0_0 Examples

Example #1

func main() {
	flags := struct {
		help    bool
		pretty  bool
		inFile  string
		outFile string
	}{}

	flag.BoolVar(&flags.help, "help", false, "print help and exit")
	flag.BoolVar(&flags.pretty, "pretty", false, "indent the output file")
	flag.StringVar(&flags.inFile, "in-file", "/dev/stdin", "input file (YAML)")
	flag.StringVar(&flags.outFile, "out-file", "/dev/stdout", "output file (JSON)")

	flag.Parse()

	if flags.help {
		flag.Usage()
		return
	}

	dataIn, err := ioutil.ReadFile(flags.inFile)
	if err != nil {
		stderr("Failed to read: %v", err)
		os.Exit(1)
	}

	cfg, err := config.ParseAsV2_0_0(dataIn)
	if err != nil {
		stderr("Failed to parse: %v", err)
		os.Exit(1)
	}

	var dataOut []byte
	if flags.pretty {
		dataOut, err = json.MarshalIndent(&cfg, "", "  ")
		dataOut = append(dataOut, '\n')
	} else {
		dataOut, err = json.Marshal(&cfg)
	}
	if err != nil {
		stderr("Failed to marshal output: %v", err)
		os.Exit(1)
	}

	if err := ioutil.WriteFile(flags.outFile, dataOut, 0640); err != nil {
		stderr("Failed to write: %v", err)
		os.Exit(1)
	}
}

Example #2

// ignitionHandler returns a handler that responds with the Ignition config
// for the requester. The Ignition file referenced in the Profile is parsed
// as raw Ignition (for .ign/.ignition) or rendered to a Fuze config (YAML)
// and converted to Ignition. Ignition configs are served as HTTP JSON
// responses.
func (s *Server) ignitionHandler(core server.Server) ContextHandler {
	fn := func(ctx context.Context, w http.ResponseWriter, req *http.Request) {
		group, err := groupFromContext(ctx)
		if err != nil {
			s.logger.WithFields(logrus.Fields{
				"labels": labelsFromRequest(nil, req),
			}).Infof("No matching group")
			http.NotFound(w, req)
			return
		}

		profile, err := core.ProfileGet(ctx, &pb.ProfileGetRequest{Id: group.Profile})
		if err != nil {
			s.logger.WithFields(logrus.Fields{
				"labels":     labelsFromRequest(nil, req),
				"group":      group.Id,
				"group_name": group.Name,
			}).Infof("No profile named: %s", group.Profile)
			http.NotFound(w, req)
			return
		}

		contents, err := core.IgnitionGet(ctx, profile.IgnitionId)
		if err != nil {
			s.logger.WithFields(logrus.Fields{
				"labels":     labelsFromRequest(nil, req),
				"group":      group.Id,
				"group_name": group.Name,
				"profile":    group.Profile,
			}).Infof("No Ignition or Fuze template named: %s", profile.IgnitionId)
			http.NotFound(w, req)
			return
		}

		// match was successful
		s.logger.WithFields(logrus.Fields{
			"labels":  labelsFromRequest(nil, req),
			"group":   group.Id,
			"profile": profile.Id,
		}).Debug("Matched an Ignition or Fuze template")

		// Skip rendering if raw Ignition JSON is provided
		if isIgnition(profile.IgnitionId) {
			_, err := ignition.Parse([]byte(contents))
			if err != nil {
				s.logger.Warningf("warning parsing Ignition JSON: %v", err)
			}
			s.writeJSON(w, []byte(contents))
			return
		}

		// Fuze Config template

		// collect data for rendering
		data := make(map[string]interface{})
		if group.Metadata != nil {
			err = json.Unmarshal(group.Metadata, &data)
			if err != nil {
				s.logger.Errorf("error unmarshalling metadata: %v", err)
				http.NotFound(w, req)
				return
			}
		}
		data["query"] = req.URL.RawQuery
		for key, value := range group.Selector {
			data[strings.ToLower(key)] = value
		}

		// render the template for an Ignition config with data
		var buf bytes.Buffer
		err = s.renderTemplate(&buf, data, contents)
		if err != nil {
			http.NotFound(w, req)
			return
		}

		// Parse fuze config into an Ignition config
		config, err := fuze.ParseAsV2_0_0(buf.Bytes())
		if err == nil {
			s.renderJSON(w, config)
			return
		}

		s.logger.Errorf("error parsing Ignition config: %v", err)
		http.NotFound(w, req)
		return
	}
	return ContextHandlerFunc(fn)
}