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