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path: root/server.go
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package goxy

import (
	"crypto/tls"
	"encoding/json"
	"net/http"
	"net/http/httputil"
	"net/url"
	"os"
	"strings"
)

type Server struct {
	DataFile string
	Route
	http.Server
}

func NewServer(fname string) (*Server, error) {
	r := make(Route)
	s := http.Server{TLSConfig: &tls.Config{GetCertificate: r.GetCertificate}}
	server := &Server{Route: r, Server: s, DataFile: fname}
	server.Load()
	Register(server)
	return server, server.Restore()
}

// Save routes to persistent file
func (s Server) Save() error {
	if s.DataFile == "" {
		return nil
	}
	fd, err := os.Create(s.DataFile)
	if err != nil {
		return err
	}
	defer fd.Close()
	return json.NewEncoder(fd).Encode(s.Route)
}

// Load routes from persistent file
func (s *Server) Load() error {
	if s.DataFile == "" {
		return nil
	}
	fd, err := os.Open(s.DataFile)
	if err != nil {
		return err
	}
	defer fd.Close()
	return json.NewDecoder(fd).Decode(&s.Route)
}

// Restore and update routes from in-memory state
func (s *Server) Restore() error {
	mux := http.NewServeMux()
	for k, v := range s.Route {
		if v.Cert != nil && v.Key != nil {
			cert, err := tls.X509KeyPair(v.Cert, v.Key)
			if err != nil {
				return err
			}
			v.cert = &cert
			s.Route[k] = v
		}
		up, err := url.Parse(v.Upstream)
		if err != nil {
			return err
		}
		if !strings.Contains(v.Host, "/") {
			v.Host += "/"
		}
		switch up.Scheme {
		case "ws":
			mux.Handle(v.Host, NewWebSocketProxy(up))
		default:
			mux.Handle(v.Host, httputil.NewSingleHostReverseProxy(up))
		}
	}
	s.Server.Handler = mux
	return nil
}

func (s *Server) Start() error {
	errc := make(chan error)
	go func() { errc <- s.ListenAndServe() }()
	go func() { errc <- s.ListenAndServeTLS("", "") }()
	go func() { errc <- http.ListenAndServe(":http-alt", nil) }()
	return <-errc
}