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router.go
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router.go
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package martini
import (
"fmt"
"net/http"
"reflect"
"regexp"
"strconv"
"sync"
)
// Params is a map of name/value pairs for named routes. An instance of martini.Params is available to be injected into any route handler.
type Params map[string]string
// Router is Martini's de-facto routing interface. Supports HTTP verbs, stacked handlers, and dependency injection.
type Router interface {
Routes
// Group adds a group where related routes can be added.
Group(string, func(Router), ...Handler)
// Get adds a route for a HTTP GET request to the specified matching pattern.
Get(string, ...Handler) Route
// Patch adds a route for a HTTP PATCH request to the specified matching pattern.
Patch(string, ...Handler) Route
// Post adds a route for a HTTP POST request to the specified matching pattern.
Post(string, ...Handler) Route
// Put adds a route for a HTTP PUT request to the specified matching pattern.
Put(string, ...Handler) Route
// Delete adds a route for a HTTP DELETE request to the specified matching pattern.
Delete(string, ...Handler) Route
// Options adds a route for a HTTP OPTIONS request to the specified matching pattern.
Options(string, ...Handler) Route
// Head adds a route for a HTTP HEAD request to the specified matching pattern.
Head(string, ...Handler) Route
// Any adds a route for any HTTP method request to the specified matching pattern.
Any(string, ...Handler) Route
// AddRoute adds a route for a given HTTP method request to the specified matching pattern.
AddRoute(string, string, ...Handler) Route
// NotFound sets the handlers that are called when a no route matches a request. Throws a basic 404 by default.
NotFound(...Handler)
// Handle is the entry point for routing. This is used as a martini.Handler
Handle(http.ResponseWriter, *http.Request, Context)
}
type router struct {
routes []*route
notFounds []Handler
groups []group
routesLock sync.RWMutex
}
type group struct {
pattern string
handlers []Handler
}
// NewRouter creates a new Router instance.
// If you aren't using ClassicMartini, then you can add Routes as a
// service with:
//
// m := martini.New()
// r := martini.NewRouter()
// m.MapTo(r, (*martini.Routes)(nil))
//
// If you are using ClassicMartini, then this is done for you.
func NewRouter() Router {
return &router{notFounds: []Handler{http.NotFound}, groups: make([]group, 0)}
}
func (r *router) Group(pattern string, fn func(Router), h ...Handler) {
r.groups = append(r.groups, group{pattern, h})
fn(r)
r.groups = r.groups[:len(r.groups)-1]
}
func (r *router) Get(pattern string, h ...Handler) Route {
return r.addRoute("GET", pattern, h)
}
func (r *router) Patch(pattern string, h ...Handler) Route {
return r.addRoute("PATCH", pattern, h)
}
func (r *router) Post(pattern string, h ...Handler) Route {
return r.addRoute("POST", pattern, h)
}
func (r *router) Put(pattern string, h ...Handler) Route {
return r.addRoute("PUT", pattern, h)
}
func (r *router) Delete(pattern string, h ...Handler) Route {
return r.addRoute("DELETE", pattern, h)
}
func (r *router) Options(pattern string, h ...Handler) Route {
return r.addRoute("OPTIONS", pattern, h)
}
func (r *router) Head(pattern string, h ...Handler) Route {
return r.addRoute("HEAD", pattern, h)
}
func (r *router) Any(pattern string, h ...Handler) Route {
return r.addRoute("*", pattern, h)
}
func (r *router) AddRoute(method, pattern string, h ...Handler) Route {
return r.addRoute(method, pattern, h)
}
func (r *router) Handle(res http.ResponseWriter, req *http.Request, context Context) {
for _, route := range r.getRoutes() {
ok, vals := route.Match(req.Method, req.URL.Path)
if ok {
params := Params(vals)
context.Map(params)
route.Handle(context, res)
return
}
}
// no routes exist, 404
c := &routeContext{context, 0, r.notFounds}
context.MapTo(c, (*Context)(nil))
c.run()
}
func (r *router) NotFound(handler ...Handler) {
r.notFounds = handler
}
func (r *router) addRoute(method string, pattern string, handlers []Handler) *route {
if len(r.groups) > 0 {
groupPattern := ""
h := make([]Handler, 0)
for _, g := range r.groups {
groupPattern += g.pattern
h = append(h, g.handlers...)
}
pattern = groupPattern + pattern
h = append(h, handlers...)
handlers = h
}
route := newRoute(method, pattern, handlers)
route.Validate()
r.appendRoute(route)
return route
}
func (r *router) appendRoute(rt *route) {
r.routesLock.Lock()
defer r.routesLock.Unlock()
r.routes = append(r.routes, rt)
}
func (r *router) getRoutes() []*route {
r.routesLock.RLock()
defer r.routesLock.RUnlock()
return r.routes[:]
}
func (r *router) findRoute(name string) *route {
for _, route := range r.getRoutes() {
if route.name == name {
return route
}
}
return nil
}
// Route is an interface representing a Route in Martini's routing layer.
type Route interface {
// URLWith returns a rendering of the Route's url with the given string params.
URLWith([]string) string
// Name sets a name for the route.
Name(string)
// GetName returns the name of the route.
GetName() string
// Pattern returns the pattern of the route.
Pattern() string
// Method returns the method of the route.
Method() string
}
type route struct {
method string
regex *regexp.Regexp
handlers []Handler
pattern string
name string
}
var routeReg1 = regexp.MustCompile(`:[^/#?()\.\\]+`)
var routeReg2 = regexp.MustCompile(`\*\*`)
func newRoute(method string, pattern string, handlers []Handler) *route {
route := route{method, nil, handlers, pattern, ""}
pattern = routeReg1.ReplaceAllStringFunc(pattern, func(m string) string {
return fmt.Sprintf(`(?P<%s>[^/#?]+)`, m[1:])
})
var index int
pattern = routeReg2.ReplaceAllStringFunc(pattern, func(m string) string {
index++
return fmt.Sprintf(`(?P<_%d>[^#?]*)`, index)
})
pattern += `\/?`
route.regex = regexp.MustCompile(pattern)
return &route
}
func (r route) MatchMethod(method string) bool {
return r.method == "*" || method == r.method || (method == "HEAD" && r.method == "GET")
}
func (r route) Match(method string, path string) (bool, map[string]string) {
// add Any method matching support
if !r.MatchMethod(method) {
return false, nil
}
matches := r.regex.FindStringSubmatch(path)
if len(matches) > 0 && matches[0] == path {
params := make(map[string]string)
for i, name := range r.regex.SubexpNames() {
if len(name) > 0 {
params[name] = matches[i]
}
}
return true, params
}
return false, nil
}
func (r *route) Validate() {
for _, handler := range r.handlers {
validateHandler(handler)
}
}
func (r *route) Handle(c Context, res http.ResponseWriter) {
context := &routeContext{c, 0, r.handlers}
c.MapTo(context, (*Context)(nil))
c.MapTo(r, (*Route)(nil))
context.run()
}
var urlReg = regexp.MustCompile(`:[^/#?()\.\\]+|\(\?P<[a-zA-Z0-9]+>.*\)`)
// URLWith returns the url pattern replacing the parameters for its values
func (r *route) URLWith(args []string) string {
if len(args) > 0 {
argCount := len(args)
i := 0
url := urlReg.ReplaceAllStringFunc(r.pattern, func(m string) string {
var val interface{}
if i < argCount {
val = args[i]
} else {
val = m
}
i += 1
return fmt.Sprintf(`%v`, val)
})
return url
}
return r.pattern
}
func (r *route) Name(name string) {
r.name = name
}
func (r *route) GetName() string {
return r.name
}
func (r *route) Pattern() string {
return r.pattern
}
func (r *route) Method() string {
return r.method
}
// Routes is a helper service for Martini's routing layer.
type Routes interface {
// URLFor returns a rendered URL for the given route. Optional params can be passed to fulfill named parameters in the route.
URLFor(name string, params ...interface{}) string
// MethodsFor returns an array of methods available for the path
MethodsFor(path string) []string
// All returns an array with all the routes in the router.
All() []Route
}
// URLFor returns the url for the given route name.
func (r *router) URLFor(name string, params ...interface{}) string {
route := r.findRoute(name)
if route == nil {
panic("route not found")
}
var args []string
for _, param := range params {
switch v := param.(type) {
case int:
args = append(args, strconv.FormatInt(int64(v), 10))
case string:
args = append(args, v)
default:
if v != nil {
panic("Arguments passed to URLFor must be integers or strings")
}
}
}
return route.URLWith(args)
}
func (r *router) All() []Route {
routes := r.getRoutes()
var ri = make([]Route, len(routes))
for i, route := range routes {
ri[i] = Route(route)
}
return ri
}
func hasMethod(methods []string, method string) bool {
for _, v := range methods {
if v == method {
return true
}
}
return false
}
// MethodsFor returns all methods available for path
func (r *router) MethodsFor(path string) []string {
methods := []string{}
for _, route := range r.getRoutes() {
matches := route.regex.FindStringSubmatch(path)
if len(matches) > 0 && matches[0] == path && !hasMethod(methods, route.method) {
methods = append(methods, route.method)
}
}
return methods
}
type routeContext struct {
Context
index int
handlers []Handler
}
func (r *routeContext) Next() {
r.index += 1
r.run()
}
func (r *routeContext) run() {
for r.index < len(r.handlers) {
handler := r.handlers[r.index]
vals, err := r.Invoke(handler)
if err != nil {
panic(err)
}
r.index += 1
// if the handler returned something, write it to the http response
if len(vals) > 0 {
ev := r.Get(reflect.TypeOf(ReturnHandler(nil)))
handleReturn := ev.Interface().(ReturnHandler)
handleReturn(r, vals)
}
if r.Written() {
return
}
}
}