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router.go
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router.go
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package beego
import (
"net/http"
"net/url"
"reflect"
"regexp"
"runtime"
"strings"
)
type controllerInfo struct {
pattern string
regex *regexp.Regexp
params map[int]string
controllerType reflect.Type
}
type ControllerRegistor struct {
routers []*controllerInfo
}
func NewControllerRegistor() *ControllerRegistor {
return &ControllerRegistor{routers: make([]*controllerInfo, 0)}
}
func (p *ControllerRegistor) Add(pattern string, c ControllerInterface) {
parts := strings.Split(pattern, "/")
j := 0
params := make(map[int]string)
for i, part := range parts {
if strings.HasPrefix(part, ":") {
expr := "([^/]+)"
if index := strings.Index(part, "("); index != 1 {
expr = part[index:]
part = part[:index]
}
params[j] = part
parts[i] = expr
j++
}
}
pattern = strings.Join(parts, "/")
regex, regexErr := regexp.Compile(pattern)
if regexErr != nil {
panic(regexErr)
return
}
t := reflect.Indirect(reflect.ValueOf(c)).Type()
route := &controllerInfo{}
route.regex = regex
route.params = params
route.controllerType = t
p.routers = append(p.routers, route)
}
//AutoRoute
func(p *ControllerRegistor) ServeHTTP(w http.ResponseWriter, r *http.Request) {
defer func() {
if err := recover(); err != nil {
if !RecoverPanic {
panic(err)
} else {
Critical("Handler crashed with error", err)
for i := 1; ; i += 1 {
_, file, line, ok := runtime.Caller(i)
if !ok {
break
}
Critical(file, line)
}
}
}
}()
var started bool
for prefix, staticDir := range StaticDir {
if strings.HasPrefix(r.URL.Path, prefix) {
file := staticDir + r.URL.Path[len(prefix):]
http.ServeFile(w, r, file)
started = true
return
}
}
requestPath := r.URL.Path
//find a matching Route
for _, route := range p.routers {
//check if Route pattern matches url
if !route.regex.MatchString(requestPath) {
continue
}
//get submatches (params)
matches := route.regex.FindStringSubmatch(requestPath)
//double check that the Route matches the URL pattern.
if len(matches[0]) != len(requestPath) {
continue
}
params := make(map[string]string)
if len(route.params) > 0 {
//add url parameters to the query param map
values := r.URL.Query()
for i, match := range matches[1:] {
values.Add(route.params[i], match)
params[route.params[i]] = match
}
//reassemble query params and add to RawQuery
r.URL.RawQuery = url.Values(values).Encode() + "&" + r.URL.RawQuery
//r.URL.RawQuery = url.Values(values).Encode()
}
//Invoke the request handler
vc := reflect.New(route.controllerType)
init := vc.MethodByName("Init")
in := make([]reflect.Value, 2)
ct := &Context{ResponseWriter: w, Request: r, Params: params}
in[0] = reflect.ValueOf(ct)
in[1] = reflect.ValueOf(route.controllerType.Name())
init.Call(in)
in = make([]reflect.Value, 0)
method := vc.MethodByName("Prepare")
method.Call(in)
if r.Method == "GET" {
method = vc.MethodByName("Get")
method.Call(in)
} else if r.Method == "POST" {
method = vc.MethodByName("Post")
method.Call(in)
} else if r.Method == "HEAD" {
method = vc.MethodByName("Head")
method.Call(in)
} else if r.Method == "DELETE" {
method = vc.MethodByName("Delete")
method.Call(in)
} else if r.Method == "PUT" {
method = vc.MethodByName("Put")
method.Call(in)
} else if r.Method == "PATCH" {
method = vc.MethodByName("Patch")
method.Call(in)
} else if r.Method == "OPTIONS" {
method = vc.MethodByName("Options")
method.Call(in)
}
if AutoRender {
method = vc.MethodByName("Render")
method.Call(in)
}
method = vc.MethodByName("Finish")
method.Call(in)
started = true
break
}
//if no matches to url, throw a not found exception
if started == false {
http.NotFound(w, r)
}
}