forked from megamsys/vertice
/
router.go
56 lines (47 loc) · 1.37 KB
/
router.go
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package router
import (
"errors"
"fmt"
"strings"
)
type routerFactory func(string) (Router, error)
var (
ErrInvalidCName = errors.New("CNAME is invalid. [valid examples are: megam.megambox.com, www.google.com, typo.com]")
ErrDomainNotFound = errors.New("Domain not found")
ErrCNameNotFound = errors.New("CNAME not found")
ErrCNameMissingArgs = errors.New("CNAME missing args. [cname (and/or) ip] needed.")
)
var routers = make(map[string]routerFactory)
// Register registers a new router.
func Register(name string, r routerFactory) {
routers[name] = r
}
// Get gets the named router from the registry.
func Get(name string) (Router, error) {
factory, ok := routers[name]
if !ok {
return nil, fmt.Errorf("unknown router: %q.", name)
}
r, err := factory(name)
if err != nil {
return nil, err
}
return r, nil
}
// Router is the basic interface of this package. It provides methods for
// managing backends and routes. Each backend can have multiple routes.
type Router interface {
SetCName(cname, name string) error
UnsetCName(cname, name string) error
Addr(name string) (string, error)
}
type MessageRouter interface {
StartupMessage() (string, error)
}
func ChopDomain(cname string) (string, error) {
sdoms := splitDomainName(cname)
if sdoms != nil && len(sdoms) >= 2 {
return strings.Join(sdoms[(len(sdoms)-2):], "."), nil
}
return "", ErrInvalidCName
}