374 lines
9.8 KiB
Go
374 lines
9.8 KiB
Go
/* WIP Under Construction */
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package main
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import (
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"bytes"
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"log"
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"os"
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"strconv"
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"text/template"
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)
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var routeList []*RouteImpl
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var routeGroups []*RouteGroup
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type TmplVars struct {
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RouteList []*RouteImpl
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RouteGroups []*RouteGroup
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AllRouteNames []string
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AllRouteMap map[string]int
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}
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func main() {
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log.Println("Generating the router...")
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// Load all the routes...
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routes()
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var tmplVars = TmplVars{
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RouteList: routeList,
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RouteGroups: routeGroups,
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}
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var allRouteNames []string
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var allRouteMap = make(map[string]int)
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var out string
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var mapIt = func(name string) {
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allRouteNames = append(allRouteNames, name)
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allRouteMap[name] = len(allRouteNames) - 1
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}
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var countToIndents = func(indent int) (indentor string) {
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for i := 0; i < indent; i++ {
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indentor += "\t"
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}
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return indentor
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}
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var runBefore = func(runnables []Runnable, indent int) (out string) {
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var indentor = countToIndents(indent)
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if len(runnables) > 0 {
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for _, runnable := range runnables {
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if runnable.Literal {
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out += "\n\t" + indentor + runnable.Contents
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} else {
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out += "\n" + indentor + "err = common." + runnable.Contents + "(w,req,user)\n" +
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indentor + "if err != nil {\n" +
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indentor + "\trouter.handleError(err,w,req,user)\n" +
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indentor + "\treturn\n" +
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indentor + "}\n" + indentor
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}
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}
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}
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return out
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}
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for _, route := range routeList {
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mapIt(route.Name)
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var end = len(route.Path) - 1
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out += "\n\t\tcase \"" + route.Path[0:end] + "\":"
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out += runBefore(route.RunBefore, 4)
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out += "\n\t\t\tcommon.RouteViewCounter.Bump(" + strconv.Itoa(allRouteMap[route.Name]) + ")"
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out += "\n\t\t\terr = " + route.Name + "(w,req,user"
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for _, item := range route.Vars {
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out += "," + item
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}
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out += `)
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if err != nil {
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router.handleError(err,w,req,user)
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}`
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}
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for _, group := range routeGroups {
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var end = len(group.Path) - 1
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out += "\n\t\tcase \"" + group.Path[0:end] + "\":"
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out += runBefore(group.RunBefore, 3)
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out += "\n\t\t\tswitch(req.URL.Path) {"
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var defaultRoute = blankRoute()
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for _, route := range group.RouteList {
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if group.Path == route.Path {
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defaultRoute = route
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continue
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}
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mapIt(route.Name)
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out += "\n\t\t\t\tcase \"" + route.Path + "\":"
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if len(route.RunBefore) > 0 {
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skipRunnable:
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for _, runnable := range route.RunBefore {
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for _, gRunnable := range group.RunBefore {
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if gRunnable.Contents == runnable.Contents {
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continue
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}
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// TODO: Stop hard-coding these
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if gRunnable.Contents == "AdminOnly" && runnable.Contents == "MemberOnly" {
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continue skipRunnable
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}
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if gRunnable.Contents == "AdminOnly" && runnable.Contents == "SuperModOnly" {
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continue skipRunnable
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}
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if gRunnable.Contents == "SuperModOnly" && runnable.Contents == "MemberOnly" {
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continue skipRunnable
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}
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}
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if runnable.Literal {
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out += "\n\t\t\t\t\t" + runnable.Contents
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} else {
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out += `
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err = common.` + runnable.Contents + `(w,req,user)
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if err != nil {
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router.handleError(err,w,req,user)
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return
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}
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`
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}
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}
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}
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out += "\n\t\t\t\t\tcommon.RouteViewCounter.Bump(" + strconv.Itoa(allRouteMap[route.Name]) + ")"
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out += "\n\t\t\t\t\terr = " + route.Name + "(w,req,user"
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for _, item := range route.Vars {
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out += "," + item
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}
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out += ")"
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}
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if defaultRoute.Name != "" {
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mapIt(defaultRoute.Name)
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out += "\n\t\t\t\tdefault:"
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out += runBefore(defaultRoute.RunBefore, 4)
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out += "\n\t\t\t\t\tcommon.RouteViewCounter.Bump(" + strconv.Itoa(allRouteMap[defaultRoute.Name]) + ")"
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out += "\n\t\t\t\t\terr = " + defaultRoute.Name + "(w,req,user"
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for _, item := range defaultRoute.Vars {
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out += ", " + item
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}
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out += ")"
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}
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out += `
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}
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if err != nil {
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router.handleError(err,w,req,user)
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}`
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}
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tmplVars.AllRouteNames = allRouteNames
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tmplVars.AllRouteMap = allRouteMap
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var fileData = `// Code generated by. DO NOT EDIT.
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/* This file was automatically generated by the software. Please don't edit it as your changes may be overwritten at any moment. */
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package main
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import (
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"log"
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"strings"
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"sync"
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"errors"
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"net/http"
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"./common"
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)
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var ErrNoRoute = errors.New("That route doesn't exist.")
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// TODO: What about the /uploads/ route? x.x
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var RouteMap = map[string]interface{}{ {{range .AllRouteNames}}
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"{{.}}": {{.}},{{end}}
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}
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// ! NEVER RELY ON THESE REMAINING THE SAME BETWEEN COMMITS
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var routeMapEnum = map[string]int{ {{range $index, $element := .AllRouteNames}}
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"{{$element}}": {{$index}},{{end}}
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}
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var reverseRouteMapEnum = map[int]string{ {{range $index, $element := .AllRouteNames}}
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{{$index}}: "{{$element}}",{{end}}
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}
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// TODO: Stop spilling these into the package scope?
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func init() {
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common.SetRouteMapEnum(routeMapEnum)
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common.SetReverseRouteMapEnum(reverseRouteMapEnum)
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}
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type GenRouter struct {
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UploadHandler func(http.ResponseWriter, *http.Request)
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extraRoutes map[string]func(http.ResponseWriter, *http.Request, common.User) common.RouteError
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sync.RWMutex
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}
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func NewGenRouter(uploads http.Handler) *GenRouter {
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return &GenRouter{
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UploadHandler: http.StripPrefix("/uploads/",uploads).ServeHTTP,
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extraRoutes: make(map[string]func(http.ResponseWriter, *http.Request, common.User) common.RouteError),
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}
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}
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func (router *GenRouter) handleError(err common.RouteError, w http.ResponseWriter, r *http.Request, user common.User) {
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if err.Handled() {
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return
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}
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if err.Type() == "system" {
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common.InternalErrorJSQ(err, w, r, err.JSON())
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return
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}
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common.LocalErrorJSQ(err.Error(), w, r, user,err.JSON())
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}
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func (router *GenRouter) Handle(_ string, _ http.Handler) {
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}
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func (router *GenRouter) HandleFunc(pattern string, handle func(http.ResponseWriter, *http.Request, common.User) common.RouteError) {
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router.Lock()
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defer router.Unlock()
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router.extraRoutes[pattern] = handle
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}
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func (router *GenRouter) RemoveFunc(pattern string) error {
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router.Lock()
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defer router.Unlock()
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_, ok := router.extraRoutes[pattern]
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if !ok {
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return ErrNoRoute
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}
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delete(router.extraRoutes, pattern)
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return nil
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}
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// TODO: Pass the default route or config struct to the router rather than accessing it via a package global
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// TODO: SetDefaultRoute
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// TODO: GetDefaultRoute
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func (router *GenRouter) ServeHTTP(w http.ResponseWriter, req *http.Request) {
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if len(req.URL.Path) == 0 || req.URL.Path[0] != '/' {
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w.WriteHeader(405)
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w.Write([]byte(""))
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return
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}
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var prefix, extraData string
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prefix = req.URL.Path[0:strings.IndexByte(req.URL.Path[1:],'/') + 1]
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if req.URL.Path[len(req.URL.Path) - 1] != '/' {
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extraData = req.URL.Path[strings.LastIndexByte(req.URL.Path,'/') + 1:]
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req.URL.Path = req.URL.Path[:strings.LastIndexByte(req.URL.Path,'/') + 1]
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}
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if common.Dev.SuperDebug {
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log.Print("before routeStatic")
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log.Print("prefix: ", prefix)
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log.Print("req.URL.Path: ", req.URL.Path)
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log.Print("extraData: ", extraData)
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log.Print("req.Referer(): ", req.Referer())
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}
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if prefix == "/static" {
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req.URL.Path += extraData
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routeStatic(w, req)
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return
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}
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if common.Dev.SuperDebug {
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log.Print("before PreRoute")
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}
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// Increment the global view counter
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common.GlobalViewCounter.Bump()
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// Deal with the session stuff, etc.
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user, ok := common.PreRoute(w, req)
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if !ok {
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return
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}
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if common.Dev.SuperDebug {
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log.Print("after PreRoute")
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log.Print("routeMapEnum: ", routeMapEnum)
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}
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var err common.RouteError
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switch(prefix) {` + out + `
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/*case "/sitemaps": // TODO: Count these views
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req.URL.Path += extraData
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err = sitemapSwitch(w,req)
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if err != nil {
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router.handleError(err,w,req,user)
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}*/
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case "/uploads":
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if extraData == "" {
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common.NotFound(w,req)
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return
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}
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req.URL.Path += extraData
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// TODO: Find a way to propagate errors up from this?
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router.UploadHandler(w,req) // TODO: Count these views
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case "":
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// Stop the favicons, robots.txt file, etc. resolving to the topics list
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// TODO: Add support for favicons and robots.txt files
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switch(extraData) {
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case "robots.txt":
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err = routeRobotsTxt(w,req) // TODO: Count these views
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if err != nil {
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router.handleError(err,w,req,user)
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}
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return
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/*case "sitemap.xml":
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err = routeSitemapXml(w,req) // TODO: Count these views
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if err != nil {
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router.handleError(err,w,req,user)
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}
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return*/
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}
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if extraData != "" {
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common.NotFound(w,req)
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return
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}
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handle, ok := RouteMap[common.Config.DefaultRoute]
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if !ok {
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// TODO: Make this a startup error not a runtime one
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log.Print("Unable to find the default route")
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common.NotFound(w,req)
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return
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}
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common.RouteViewCounter.Bump(routeMapEnum[common.Config.DefaultRoute])
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handle.(func(http.ResponseWriter, *http.Request, common.User) common.RouteError)(w,req,user)
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default:
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// A fallback for the routes which haven't been converted to the new router yet or plugins
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router.RLock()
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handle, ok := router.extraRoutes[req.URL.Path]
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router.RUnlock()
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if ok {
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req.URL.Path += extraData
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err = handle(w,req,user) // TODO: Count these views
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if err != nil {
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router.handleError(err,w,req,user)
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}
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return
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}
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common.NotFound(w,req) // TODO: Collect all the error view counts so we can add a replacement for GlobalViewCounter by adding up the view counts of every route? Complex and may be inaccurate, collecting it globally and locally would at-least help find places we aren't capturing views
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}
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}
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`
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var tmpl = template.Must(template.New("router").Parse(fileData))
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var b bytes.Buffer
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err := tmpl.Execute(&b, tmplVars)
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if err != nil {
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log.Fatal(err)
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}
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writeFile("./gen_router.go", string(b.Bytes()))
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log.Println("Successfully generated the router")
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}
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func writeFile(name string, content string) {
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f, err := os.Create(name)
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if err != nil {
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log.Fatal(err)
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}
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_, err = f.WriteString(content)
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if err != nil {
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log.Fatal(err)
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}
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f.Sync()
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f.Close()
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}
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