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router.go
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router.go
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package znet
import (
"context"
"errors"
"fmt"
"net/http"
"path"
"regexp"
"strings"
"github.com/sohaha/zlsgo/zstring"
)
var (
// ErrGenerateParameters is returned when generating a route withRequestLog wrong parameters.
ErrGenerateParameters = errors.New("params contains wrong parameters")
// ErrNotFoundRoute is returned when generating a route that can not find route in tree.
ErrNotFoundRoute = errors.New("cannot find route in tree")
// ErrNotFoundMethod is returned when generating a route that can not find method in tree.
ErrNotFoundMethod = errors.New("cannot find method in tree")
// ErrPatternGrammar is returned when generating a route that pattern grammar error.
ErrPatternGrammar = errors.New("pattern grammar error")
defaultPattern = `[\w\p{Han}\.\- ]+`
idPattern = `[\d]+`
idKey = `id`
allPattern = `[\w\p{Han}\s\S]+`
allKey = `*`
contextKey = contextKeyType{}
methods = map[string]struct{}{
http.MethodGet: {},
http.MethodPost: {},
http.MethodPut: {},
http.MethodDelete: {},
http.MethodPatch: {},
http.MethodHead: {},
http.MethodOptions: {},
http.MethodConnect: {},
http.MethodTrace: {},
}
)
type (
// contextKeyType Private Value Structure for Each Request
contextKeyType struct{}
// ParamsMapType Storage path parameters
ParamsMapType map[string]string
)
func temporarilyTurnOffTheLog(e *Engine, msg string) func() {
mode := e.webMode
e.webMode = prodCode
return func() {
e.webMode = mode
if e.IsDebug() {
e.Log.Debug(msg)
}
}
}
func (e *Engine) StaticFS(relativePath string, fs http.FileSystem) {
var urlPattern string
log := temporarilyTurnOffTheLog(e, showRouteDebug(e.Log, fmt.Sprintf("%%s --> %%s ->> %s", fs), "Static", relativePath))
fileServer := http.StripPrefix(relativePath, http.FileServer(fs))
handler := func(c *Context) {
fileServer.ServeHTTP(c.Writer, c.Request)
}
if strings.HasSuffix(relativePath, "/") {
urlPattern = path.Join(relativePath, "*")
e.GET(relativePath, handler)
} else {
urlPattern = path.Join(relativePath, "/*")
e.GET(relativePath, func(c *Context) {
c.Redirect(relativePath + "/")
})
e.GET(relativePath+"/", handler)
}
e.GET(urlPattern, handler)
e.HEAD(urlPattern, handler)
log()
}
func (e *Engine) Static(relativePath, root string) {
e.StaticFS(relativePath, http.Dir(root))
}
func (e *Engine) StaticFile(relativePath, filepath string) {
handler := func(c *Context) {
c.File(filepath)
}
log := temporarilyTurnOffTheLog(e, showRouteDebug(e.Log, "%s --> %s ->> "+filepath, "File", relativePath))
e.GET(relativePath, handler)
e.HEAD(relativePath, handler)
log()
}
func (e *Engine) Any(path string, handle HandlerFunc, moreHandler ...HandlerFunc) {
log := temporarilyTurnOffTheLog(e, showRouteDebug(e.Log, "%s --> %s", "Any", completionPath(path, e.router.prefix)))
e.GET(path, handle, moreHandler...)
e.POST(path, handle, moreHandler...)
e.PUT(path, handle, moreHandler...)
e.DELETE(path, handle, moreHandler...)
e.PATCH(path, handle, moreHandler...)
e.HEAD(path, handle, moreHandler...)
e.OPTIONS(path, handle, moreHandler...)
e.CONNECT(path, handle, moreHandler...)
e.TRACE(path, handle, moreHandler...)
log()
}
func (e *Engine) Customize(method, path string, handle HandlerFunc, moreHandler ...HandlerFunc) {
method = strings.ToUpper(method)
e.Handle(method, path, handle, moreHandler...)
}
func (e *Engine) GET(path string, handle HandlerFunc, moreHandler ...HandlerFunc) {
e.Handle(http.MethodGet, path, handle, moreHandler...)
}
func (e *Engine) POST(path string, handle HandlerFunc, moreHandler ...HandlerFunc) {
e.Handle(http.MethodPost, path, handle, moreHandler...)
}
func (e *Engine) DELETE(path string, handle HandlerFunc, moreHandler ...HandlerFunc) {
e.Handle(http.MethodDelete, path, handle, moreHandler...)
}
func (e *Engine) PUT(path string, handle HandlerFunc, moreHandler ...HandlerFunc) {
e.Handle(http.MethodPut, path, handle, moreHandler...)
}
func (e *Engine) PATCH(path string, handle HandlerFunc, moreHandler ...HandlerFunc) {
e.Handle(http.MethodPatch, path, handle, moreHandler...)
}
func (e *Engine) HEAD(path string, handle HandlerFunc, moreHandler ...HandlerFunc) {
e.Handle(http.MethodHead, path, handle, moreHandler...)
}
func (e *Engine) OPTIONS(path string, handle HandlerFunc, moreHandler ...HandlerFunc) {
e.Handle(http.MethodOptions, path, handle, moreHandler...)
}
func (e *Engine) CONNECT(path string, handle HandlerFunc, moreHandler ...HandlerFunc) {
e.Handle(http.MethodConnect, path, handle, moreHandler...)
}
func (e *Engine) TRACE(path string, handle HandlerFunc, moreHandler ...HandlerFunc) {
e.Handle(http.MethodTrace, path, handle, moreHandler...)
}
func (e *Engine) GETAndName(path string, handle HandlerFunc, routeName string) {
e.router.parameters.routeName = routeName
defer func() { e.router.parameters.routeName = "" }()
e.GET(path, handle)
}
func (e *Engine) POSTAndName(path string, handle HandlerFunc, routeName string) {
e.router.parameters.routeName = routeName
defer func() { e.router.parameters.routeName = "" }()
e.POST(path, handle)
}
func (e *Engine) DELETEAndName(path string, handle HandlerFunc, routeName string) {
e.router.parameters.routeName = routeName
defer func() { e.router.parameters.routeName = "" }()
e.DELETE(path, handle)
}
func (e *Engine) PUTAndName(path string, handle HandlerFunc, routeName string) {
e.router.parameters.routeName = routeName
defer func() { e.router.parameters.routeName = "" }()
e.PUT(path, handle)
}
func (e *Engine) PATCHAndName(path string, handle HandlerFunc, routeName string) {
e.router.parameters.routeName = routeName
defer func() { e.router.parameters.routeName = "" }()
e.PATCH(path, handle)
}
func (e *Engine) HEADAndName(path string, handle HandlerFunc, routeName string) {
e.router.parameters.routeName = routeName
defer func() { e.router.parameters.routeName = "" }()
e.HEAD(path, handle)
}
func (e *Engine) OPTIONSAndName(path string, handle HandlerFunc, routeName string) {
e.router.parameters.routeName = routeName
defer func() { e.router.parameters.routeName = "" }()
e.OPTIONS(path, handle)
}
func (e *Engine) CONNECTAndName(path string, handle HandlerFunc, routeName string) {
e.router.parameters.routeName = routeName
defer func() { e.router.parameters.routeName = "" }()
e.CONNECT(path, handle)
}
func (e *Engine) TRACEAndName(path string, handle HandlerFunc, routeName string) {
e.router.parameters.routeName = routeName
defer func() { e.router.parameters.routeName = "" }()
e.TRACE(path, handle)
}
func (e *Engine) Group(prefix string, groupHandle ...func(e *Engine)) (engine *Engine) {
rprefix := e.router.prefix
if rprefix != "" {
if strings.HasSuffix(rprefix, "/") && strings.HasPrefix(prefix, "/") {
prefix = strings.TrimPrefix(prefix, "/")
}
prefix = rprefix + prefix
}
route := &router{
prefix: prefix,
trees: e.router.trees,
middleware: e.router.middleware,
}
engine = &Engine{
webMode: e.webMode,
webModeName: e.webModeName,
MaxMultipartMemory: e.MaxMultipartMemory,
customMethodType: e.customMethodType,
router: route,
Log: e.Log,
Cache: e.Cache,
BindStructDelimiter: BindStructDelimiter,
BindStructSuffix: BindStructSuffix,
}
if len(groupHandle) > 0 {
groupHandle[0](engine)
}
return
}
func (e *Engine) GenerateURL(method string, routeName string, params map[string]string) (string, error) {
tree, ok := e.router.trees[method]
if !ok {
return "", ErrNotFoundMethod
}
route, ok := tree.routes[routeName]
if !ok {
return "", ErrNotFoundRoute
}
var segments []string
res := strings.Split(route.path, "/")
for _, segment := range res {
if segment != "" {
if string(segment[0]) == ":" {
key := params[segment[1:]]
re := regexp.MustCompile(defaultPattern)
if one := re.Find([]byte(key)); one == nil {
return "", ErrGenerateParameters
}
segments = append(segments, key)
continue
}
if string(segment[0]) == "{" {
segmentLen := len(segment)
if string(segment[segmentLen-1]) == "}" {
splitRes := strings.Split(segment[1:segmentLen-1], ":")
re := regexp.MustCompile(splitRes[1])
key := params[splitRes[0]]
if one := re.Find([]byte(key)); one == nil {
return "", ErrGenerateParameters
}
segments = append(segments, key)
continue
}
return "", ErrPatternGrammar
}
if string(segment[len(segment)-1]) == "}" && string(segment[0]) != "{" {
return "", ErrPatternGrammar
}
}
segments = append(segments, segment)
continue
}
return "/" + strings.Join(segments, "/"), nil
}
func (e *Engine) PreHandler(preHandler func(context *Context) (stop bool)) {
e.preHandler = preHandler
}
func (e *Engine) NotFoundHandler(handler HandlerFunc) {
e.router.notFound = handler
}
func (e *Engine) PanicHandler(handler PanicFunc) {
e.Use(Recovery(e, handler))
}
// GetTrees Get Trees
func (e *Engine) GetTrees() map[string]*Tree {
return e.router.trees
}
// Handle registers new request handler
func (e *Engine) Handle(method string, path string, handle HandlerFunc, moreHandler ...HandlerFunc) {
if _, ok := methods[method]; !ok {
e.Log.Fatal(method + " is invalid method")
}
tree, ok := e.router.trees[method]
if !ok {
tree = NewTree()
e.router.trees[method] = tree
}
path = completionPath(path, e.router.prefix)
if routeName := e.router.parameters.routeName; routeName != "" {
tree.parameters.routeName = routeName
}
if e.IsDebug() {
e.Log.Debug(showRouteDebug(e.Log, "%s --> %s", method, path))
}
middleware := e.router.middleware
if len(moreHandler) > 0 {
middleware = append(middleware, moreHandler...)
}
tree.Add(path, handle, middleware...)
tree.parameters.routeName = ""
}
func (e *Engine) GetPanicHandler() PanicFunc {
return e.router.panic
}
func (e *Engine) ServeHTTP(w http.ResponseWriter, req *http.Request) {
p := req.URL.Path
if !e.ShowFavicon && p == "/favicon.ico" {
return
}
rw := e.acquireContext()
rw.reset(w, req)
defer func() {
if e.router.panic != nil {
if err := recover(); err != nil {
rw.prevData.Code = http.StatusInternalServerError
errMsg, ok := err.(error)
if !ok {
errMsg = errors.New(fmt.Sprint(err))
}
e.router.panic(rw, errMsg)
// e.Log.Error(errMsg)
// e.Log.Track("Track Panic: ", 0, 2)
// Log.Stack()
// trace := make([]byte, 1<<16)
// n := runtime.Stack(trace, true)
// Log.Errorf("panic: '%v'\n, Stack Trace:\n %s", err, string(trace[:int(math.Min(float64(n), float64(7000)))]))
}
}
rw.done()
if e.IsDebug() {
requestLog(rw)
}
e.releaseContext(rw)
}()
// custom method type
if req.Method == "POST" && e.customMethodType != "" {
if tmpType := rw.GetHeader(e.customMethodType); tmpType != "" {
req.Method = strings.ToUpper(tmpType)
}
}
if e.preHandler != nil && e.preHandler(rw) {
return
}
rw.stopHandle = false
if _, ok := e.router.trees[req.Method]; !ok {
e.HandleNotFound(rw)
return
}
if e.FindHandle(rw, req, p, true) {
e.HandleNotFound(rw)
}
}
func (e *Engine) FindHandle(rw *Context, req *http.Request, requestURL string, applyMiddleware bool) (not bool) {
nodes := e.router.trees[req.Method].Find(requestURL, false)
p := requestURL
if len(p) > 0 {
p = requestURL[1:]
}
if len(nodes) > 0 {
node := nodes[0]
if node.handle != nil {
if node.path == requestURL {
if applyMiddleware {
handle(rw, node.handle, node.middleware)
} else {
handle(rw, node.handle, []HandlerFunc{})
}
return
}
if node.path == p {
if applyMiddleware {
handle(rw, node.handle, node.middleware)
} else {
handle(rw, node.handle, []HandlerFunc{})
}
return
}
}
}
if len(nodes) == 0 {
res := strings.Split(requestURL, "/")
nodes := e.router.trees[req.Method].Find(res[1], true)
for _, node := range nodes {
if handler := node.handle; handler != nil && node.path != requestURL {
if matchParamsMap, ok := e.matchAndParse(requestURL, node.path); ok {
ctx := context.WithValue(req.Context(), contextKey, matchParamsMap)
req = req.WithContext(ctx)
rw.Request = req
if applyMiddleware {
handle(rw, handler, node.middleware)
} else {
handle(rw, handler, []HandlerFunc{})
}
return
}
}
}
}
return true
}
func (e *Engine) Use(middleware ...HandlerFunc) {
if len(middleware) > 0 {
e.router.middleware = append(e.router.middleware, middleware...)
}
}
func (e *Engine) HandleNotFound(c *Context) {
middleware := e.GetMiddleware() // make([]HandlerFunc, 0)
c.prevData.Code = http.StatusNotFound
if e.router.notFound != nil {
handle(c, e.router.notFound, middleware)
return
}
handle(c, func(_ *Context) {
c.Abort(0)
http.NotFound(c.Writer, c.Request)
}, middleware)
}
func handle(c *Context, handler HandlerFunc, middleware []HandlerFunc) {
c.middleware = append(middleware, handler)
// c.handlerLen = len(c.middleware)
c.Next()
}
// Match checks if the request matches the route pattern
func (e *Engine) Match(requestURL string, path string) bool {
_, ok := e.matchAndParse(requestURL, path)
return ok
}
// matchAndParse checks if the request matches the route path and returns a map of the parsed
func (e *Engine) matchAndParse(requestURL string, path string) (matchParams ParamsMapType, bl bool) {
bl = true
matchParams = make(ParamsMapType)
res := strings.Split(path, "/")
pattern, matchName := parsPattern(res, "/")
if pattern == "" {
return nil, false
}
rr, err := zstring.RegexExtract(pattern, requestURL)
if err != nil || len(rr) == 0 {
return nil, false
}
if rr[0] == requestURL {
rr = rr[1:]
if len(matchName) != 0 {
for k, v := range rr {
if key := matchName[k]; key != "" {
matchParams[key] = v
}
}
}
return
}
return nil, false
}