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package goxy

import (
	"encoding/json"
	"errors"
	"fmt"
	"net/rpc"
	"os"
)

var (
	ErrNoHost    = errors.New("Both Host and Upstream are required")
	ErrNoCert    = errors.New("Certificate and Key are required")
	ErrEmptyHost = errors.New("Empty Host value")
)

const RPCPort = ":8000"

type Entries map[string]Entry

// Entry holds routing settings
type Entry struct {
	Host     string // URL
	Upstream string // URL
	Cert     []byte // PEM
	Key      []byte // PEM
}

type GoXY struct {
	server *Server
}

func init() {
	rpc.HandleHTTP()
}

func RegisterRPC(s *Server) error {
	return rpc.Register(&GoXY{s})
}

func DialRPC(server string) (*rpc.Client, error) {
	return rpc.DialHTTP("tcp", server)
}

// Add adds a new route
func (s *GoXY) Add(e Entry, _ *struct{}) error {
	return s.server.AddEntry(e)
}

// Del removes a route
func (s *GoXY) Del(host string, _ *struct{}) error {
	return s.server.DelEntry(host)
}

// List routes
func (s GoXY) List(_ struct{}, ret *[]string) error {
	for _, v := range s.server.Routes {
		*ret = append(*ret, fmt.Sprint(v))
	}
	return nil
}

func (e Entries) Save(fname string) error {
	fd, err := os.Create(fname)
	if err != nil {
		return err
	}
	defer fd.Close()
	return json.NewEncoder(fd).Encode(e)
}

func (e *Entries) Load(fname string) error {
	fd, err := os.Open(fname)
	if err != nil {
		return err
	}
	defer fd.Close()
	return json.NewDecoder(fd).Decode(e)
}