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router.go
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router.go
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package gov
import (
"fmt"
"regexp"
)
var (
_ Router = (*router)(nil)
isAlphaNumeric = regexp.MustCompile(`^[a-zA-Z0-9]+$`).MatchString
)
// Router implements a governance Handler router.
//
// TODO: Use generic router (ref #3976).
type Router interface {
AddRoute(r string, h Handler) (rtr Router)
HasRoute(r string) bool
GetRoute(path string) (h Handler)
Seal()
}
type router struct {
routes map[string]Handler
sealed bool
}
func NewRouter() Router {
return &router{
routes: make(map[string]Handler),
}
}
// Seal seals the router which prohibits any subsequent route handlers to be
// added. Seal will panic if called more than once.
func (rtr *router) Seal() {
if rtr.sealed {
panic("router already sealed")
}
rtr.sealed = true
}
// AddRoute adds a governance handler for a given path. It returns the Router
// so AddRoute calls can be linked. It will panic if the router is sealed.
func (rtr *router) AddRoute(path string, h Handler) Router {
if rtr.sealed {
panic("router sealed; cannot add route handler")
}
if !isAlphaNumeric(path) {
panic("route expressions can only contain alphanumeric characters")
}
if rtr.HasRoute(path) {
panic(fmt.Sprintf("route %s has already been initialized", path))
}
rtr.routes[path] = h
return rtr
}
// HasRoute returns true if the router has a path registered or false otherwise.
func (rtr *router) HasRoute(path string) bool {
return rtr.routes[path] != nil
}
// GetRoute returns a Handler for a given path.
func (rtr *router) GetRoute(path string) Handler {
if !rtr.HasRoute(path) {
panic(fmt.Sprintf("route \"%s\" does not exist", path))
}
return rtr.routes[path]
}