mirror of
https://github.com/astaxie/beego.git
synced 2024-11-25 19:10:54 +00:00
296 lines
7.0 KiB
Go
296 lines
7.0 KiB
Go
package beego
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import (
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"net/http"
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"net/url"
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"reflect"
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"regexp"
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"runtime"
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"strings"
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)
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type controllerInfo struct {
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pattern string
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regex *regexp.Regexp
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params map[int]string
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controllerType reflect.Type
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}
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type ControllerRegistor struct {
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routers []*controllerInfo
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fixrouters []*controllerInfo
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filters []http.HandlerFunc
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}
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func NewControllerRegistor() *ControllerRegistor {
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return &ControllerRegistor{routers: make([]*controllerInfo, 0)}
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}
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func (p *ControllerRegistor) Add(pattern string, c ControllerInterface) {
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parts := strings.Split(pattern, "/")
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j := 0
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params := make(map[int]string)
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for i, part := range parts {
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if strings.HasPrefix(part, ":") {
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expr := "([^/]+)"
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//a user may choose to override the defult expression
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// similar to expressjs: ‘/user/:id([0-9]+)’
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if index := strings.Index(part, "("); index != -1 {
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expr = part[index:]
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part = part[:index]
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}
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params[j] = part
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parts[i] = expr
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j++
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}
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}
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if j == 0 {
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//now create the Route
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t := reflect.Indirect(reflect.ValueOf(c)).Type()
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route := &controllerInfo{}
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route.pattern = pattern
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route.controllerType = t
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p.fixrouters = append(p.fixrouters, route)
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} else { // add regexp routers
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//recreate the url pattern, with parameters replaced
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//by regular expressions. then compile the regex
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pattern = strings.Join(parts, "/")
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regex, regexErr := regexp.Compile(pattern)
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if regexErr != nil {
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//TODO add error handling here to avoid panic
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panic(regexErr)
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return
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}
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//now create the Route
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t := reflect.Indirect(reflect.ValueOf(c)).Type()
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route := &controllerInfo{}
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route.regex = regex
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route.params = params
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route.pattern = pattern
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route.controllerType = t
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p.routers = append(p.routers, route)
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}
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}
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// Filter adds the middleware filter.
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func (p *ControllerRegistor) Filter(filter http.HandlerFunc) {
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p.filters = append(p.filters, filter)
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}
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// FilterParam adds the middleware filter if the REST URL parameter exists.
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func (p *ControllerRegistor) FilterParam(param string, filter http.HandlerFunc) {
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if !strings.HasPrefix(param, ":") {
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param = ":" + param
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}
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p.Filter(func(w http.ResponseWriter, r *http.Request) {
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p := r.URL.Query().Get(param)
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if len(p) > 0 {
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filter(w, r)
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}
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})
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}
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// FilterPrefixPath adds the middleware filter if the prefix path exists.
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func (p *ControllerRegistor) FilterPrefixPath(path string, filter http.HandlerFunc) {
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p.Filter(func(w http.ResponseWriter, r *http.Request) {
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if strings.HasPrefix(r.URL.Path, path) {
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filter(w, r)
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}
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})
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}
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// AutoRoute
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func (p *ControllerRegistor) ServeHTTP(rw http.ResponseWriter, r *http.Request) {
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defer func() {
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if err := recover(); err != nil {
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if !RecoverPanic {
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// go back to panic
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panic(err)
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} else {
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Critical("Handler crashed with error", err)
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for i := 1; ; i += 1 {
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_, file, line, ok := runtime.Caller(i)
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if !ok {
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break
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}
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Critical(file, line)
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}
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}
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}
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}()
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w := &responseWriter{writer: rw}
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var runrouter *controllerInfo
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var findrouter bool
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params := make(map[string]string)
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//static file server
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for prefix, staticDir := range StaticDir {
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if strings.HasPrefix(r.URL.Path, prefix) {
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file := staticDir + r.URL.Path[len(prefix):]
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http.ServeFile(w, r, file)
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w.started = true
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return
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}
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}
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requestPath := r.URL.Path
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//first find path from the fixrouters to Improve Performance
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for _, route := range p.fixrouters {
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n := len(requestPath)
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//route like "/"
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if n == 1 {
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if requestPath == route.pattern {
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runrouter = route
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findrouter = true
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break
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} else {
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continue
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}
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}
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if (requestPath[n-1] != '/' && route.pattern == requestPath) ||
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(len(route.pattern) >= n-1 && requestPath[0:n-1] == route.pattern) {
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runrouter = route
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findrouter = true
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break
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}
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}
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if !findrouter {
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//find a matching Route
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for _, route := range p.routers {
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//check if Route pattern matches url
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if !route.regex.MatchString(requestPath) {
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continue
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}
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//get submatches (params)
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matches := route.regex.FindStringSubmatch(requestPath)
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//double check that the Route matches the URL pattern.
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if len(matches[0]) != len(requestPath) {
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continue
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}
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if len(route.params) > 0 {
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//add url parameters to the query param map
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values := r.URL.Query()
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for i, match := range matches[1:] {
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values.Add(route.params[i], match)
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params[route.params[i]] = match
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}
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//reassemble query params and add to RawQuery
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r.URL.RawQuery = url.Values(values).Encode() + "&" + r.URL.RawQuery
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//r.URL.RawQuery = url.Values(values).Encode()
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}
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runrouter = route
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findrouter = true
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break
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}
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}
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if runrouter != nil {
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//execute middleware filters
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for _, filter := range p.filters {
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filter(w, r)
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if w.started {
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return
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}
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}
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//Invoke the request handler
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vc := reflect.New(runrouter.controllerType)
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//call the controller init function
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init := vc.MethodByName("Init")
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in := make([]reflect.Value, 2)
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ct := &Context{ResponseWriter: w, Request: r, Params: params}
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in[0] = reflect.ValueOf(ct)
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in[1] = reflect.ValueOf(runrouter.controllerType.Name())
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init.Call(in)
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//call prepare function
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in = make([]reflect.Value, 0)
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method := vc.MethodByName("Prepare")
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method.Call(in)
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//if response has written,yes don't run next
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if !w.started {
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if r.Method == "GET" {
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method = vc.MethodByName("Get")
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method.Call(in)
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} else if r.Method == "POST" {
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method = vc.MethodByName("Post")
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method.Call(in)
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} else if r.Method == "HEAD" {
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method = vc.MethodByName("Head")
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method.Call(in)
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} else if r.Method == "DELETE" {
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method = vc.MethodByName("Delete")
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method.Call(in)
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} else if r.Method == "PUT" {
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method = vc.MethodByName("Put")
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method.Call(in)
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} else if r.Method == "PATCH" {
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method = vc.MethodByName("Patch")
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method.Call(in)
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} else if r.Method == "OPTIONS" {
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method = vc.MethodByName("Options")
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method.Call(in)
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}
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if !w.started {
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if AutoRender {
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method = vc.MethodByName("Render")
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method.Call(in)
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}
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if !w.started {
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method = vc.MethodByName("Finish")
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method.Call(in)
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}
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}
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}
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}
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//if no matches to url, throw a not found exception
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if w.started == false {
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http.NotFound(w, r)
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}
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}
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//responseWriter is a wrapper for the http.ResponseWriter
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//started set to true if response was written to then don't execute other handler
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type responseWriter struct {
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writer http.ResponseWriter
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started bool
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status int
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}
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// Header returns the header map that will be sent by WriteHeader.
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func (w *responseWriter) Header() http.Header {
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return w.writer.Header()
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}
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// Write writes the data to the connection as part of an HTTP reply,
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// and sets `started` to true
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func (w *responseWriter) Write(p []byte) (int, error) {
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w.started = true
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return w.writer.Write(p)
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}
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// WriteHeader sends an HTTP response header with status code,
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// and sets `started` to true
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func (w *responseWriter) WriteHeader(code int) {
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w.status = code
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w.started = true
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w.writer.WriteHeader(code)
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}
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