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|
package mooh
import (
"errors"
"fmt"
"net/http"
"strings"
)
type Dispatcher struct {
routes []*Route
knownPaths map[string]map[string]bool
}
func BuildDispatcher() Dispatcher {
router := Dispatcher{}
router.knownPaths = map[string]map[string]bool{}
return router
}
func (self *Dispatcher) routeIsKnown(route *Route) bool {
if self.knownPaths[route.Path] == nil {
self.knownPaths[route.Path] = map[string]bool{}
return false
} else if self.knownPaths[route.Path][route.Method] == false {
return false
}
return true
}
func (self *Dispatcher) AddRoute(route *Route) error {
if self.routeIsKnown(route) == true {
return errors.New(fmt.Sprintf("Can't add twice the same route. The route %s with the method %s is already added", route.Path, route.Method))
}
route.init()
self.routes = append(self.routes, route)
self.knownPaths[route.Path][route.Method] = true
return nil
}
func (self *Dispatcher) Match(request *http.Request) (*Match, error) {
matches := []*Match{}
method := request.Method
components := strings.Split(request.URL.Path, "/")
for _, r := range self.routes {
match := r.Match(method, components)
if match != nil {
matches = append(matches, match)
}
}
if len(matches) == 0 {
return nil, nil
} else if len(matches) == 1 {
return matches[0], nil
} else {
return self.disambiguateMatches(request.URL.Path, matches)
}
}
func (self *Dispatcher) disambiguateMatches(path string, matches []*Match) (*Match, error) {
min := -1
found := []*Match{}
for _, m := range matches {
req := m.Route.requiredNamedComponents
vars := len(req)
if min == -1 || vars < min {
found = append(found, m)
min = vars
} else if vars == min {
found = append(found, m)
}
}
if len(found) > 1 {
msg := fmt.Sprintf("Ambiguous match: path %s could match any of:", path)
for _, f := range found {
msg = fmt.Sprintf("%s %s", msg, f.Route.Path)
}
err := errors.New(msg)
return nil, err
}
return found[0], nil
}
// func (*dispatcher) ListRoutes() {
// }
// func (*dispatcher) AddRoutes() {
// }
// func (self *dispatcher) UriFor() {
// }
|
