Merge pull request #210 from zhaoshichen1/kratos/sync_path_param

add restful router to bm

pkg/net/http/blademaster/context.go

@@ -45,6 +45,11 @@ type Context struct {
 
 	method string
 	engine *Engine
+
+	RoutePath string
+
+	Params Params
+
 }
 
 /************************************/
@@ -56,21 +61,13 @@ type Context struct {
 // See example in godoc.
 func (c *Context) Next() {
 	c.index++
-	s := int8(len(c.handlers))
+	for c.index < int8(len(c.handlers)) {
-	for ; c.index < s; c.index++ {
-		// only check method on last handler, otherwise middlewares
-		// will never be effected if request method is not matched
-		if c.index == s-1 && c.method != c.Request.Method {
-			code := http.StatusMethodNotAllowed
-			c.Error = ecode.MethodNotAllowed
-			http.Error(c.Writer, http.StatusText(code), code)
-			return
-		}
-
 		c.handlers[c.index](c)
+		c.index++
 	}
 }
 
+
 // Abort prevents pending handlers from being called. Note that this will not stop the current handler.
 // Let's say you have an authorization middleware that validates that the current request is authorized.
 // If the authorization fails (ex: the password does not match), call Abort to ensure the remaining handlers

pkg/net/http/blademaster/routergroup.go

@@ -99,11 +99,6 @@ func (group *RouterGroup) Handle(httpMethod, relativePath string, handlers ...Ha
 	return group.handle(httpMethod, relativePath, handlers...)
 }
 
-// HEAD is a shortcut for router.Handle("HEAD", path, handle).
-func (group *RouterGroup) HEAD(relativePath string, handlers ...HandlerFunc) IRoutes {
-	return group.handle("HEAD", relativePath, handlers...)
-}
-
 // GET is a shortcut for router.Handle("GET", path, handle).
 func (group *RouterGroup) GET(relativePath string, handlers ...HandlerFunc) IRoutes {
 	return group.handle("GET", relativePath, handlers...)
@@ -124,6 +119,22 @@ func (group *RouterGroup) DELETE(relativePath string, handlers ...HandlerFunc) I
 	return group.handle("DELETE", relativePath, handlers...)
 }
 
+// PATCH is a shortcut for router.Handle("PATCH", path, handle).
+func (group *RouterGroup) PATCH(relativePath string, handlers ...HandlerFunc) IRoutes {
+	return group.handle("PATCH", relativePath, handlers...)
+}
+
+// OPTIONS is a shortcut for router.Handle("OPTIONS", path, handle).
+func (group *RouterGroup) OPTIONS(relativePath string, handlers ...HandlerFunc) IRoutes {
+	return group.handle("OPTIONS", relativePath, handlers...)
+}
+
+// HEAD is a shortcut for router.Handle("HEAD", path, handle).
+func (group *RouterGroup) HEAD(relativePath string, handlers ...HandlerFunc) IRoutes {
+	return group.handle("HEAD", relativePath, handlers...)
+}
+
+
 func (group *RouterGroup) combineHandlers(handlerGroups ...[]HandlerFunc) []HandlerFunc {
 	finalSize := len(group.Handlers)
 	for _, handlers := range handlerGroups {
@@ -164,3 +175,19 @@ func (group *RouterGroup) injections(relativePath string) []HandlerFunc {
 	}
 	return nil
 }
+
+// Any registers a route that matches all the HTTP methods.
+// GET, POST, PUT, PATCH, HEAD, OPTIONS, DELETE, CONNECT, TRACE.
+func (group *RouterGroup) Any(relativePath string, handlers ...HandlerFunc) IRoutes {
+	group.handle("GET", relativePath, handlers...)
+	group.handle("POST", relativePath, handlers...)
+	group.handle("PUT", relativePath, handlers...)
+	group.handle("PATCH", relativePath, handlers...)
+	group.handle("HEAD", relativePath, handlers...)
+	group.handle("OPTIONS", relativePath, handlers...)
+	group.handle("DELETE", relativePath, handlers...)
+	group.handle("CONNECT", relativePath, handlers...)
+	group.handle("TRACE", relativePath, handlers...)
+	return group.returnObj()
+}
+

pkg/net/http/blademaster/server.go

@@ -33,6 +33,9 @@ var (
 	stats         = stat.HTTPServer
 
 	_httpDSN       string
+	default405Body = []byte("405 method not allowed")
+	default404Body = []byte("404 page not found")
+
 )
 
 func init() {
@@ -123,7 +126,7 @@ type Engine struct {
 
 	address string
 
-	mux       *http.ServeMux                    // http mux router
+	trees     methodTrees
 	server    atomic.Value                      // store *http.Server
 	metastore map[string]map[string]interface{} // metastore is the path as key and the metadata of this path as value, it export via /metadata
 
@@ -131,6 +134,28 @@ type Engine struct {
 	methodConfigs map[string]*MethodConfig
 
 	injections []injection
+
+	// If enabled, the url.RawPath will be used to find parameters.
+	UseRawPath bool
+
+	// If true, the path value will be unescaped.
+	// If UseRawPath is false (by default), the UnescapePathValues effectively is true,
+	// as url.Path gonna be used, which is already unescaped.
+	UnescapePathValues bool
+
+	// If enabled, the router checks if another method is allowed for the
+	// current route, if the current request can not be routed.
+	// If this is the case, the request is answered with 'Method Not Allowed'
+	// and HTTP status code 405.
+	// If no other Method is allowed, the request is delegated to the NotFound
+	// handler.
+	HandleMethodNotAllowed bool
+
+	allNoRoute  []HandlerFunc
+	allNoMethod []HandlerFunc
+	noRoute     []HandlerFunc
+	noMethod    []HandlerFunc
+
 }
 
 type injection struct {
@@ -152,18 +177,28 @@ func NewServer(conf *ServerConfig) *Engine {
 			basePath: "/",
 			root:     true,
 		},
+		conf: &ServerConfig{
+			Timeout: xtime.Duration(time.Second),
+		},
 		address:                ip.InternalIP(),
-		mux:           http.NewServeMux(),
+		trees:                  make(methodTrees, 0, 9),
 		metastore:              make(map[string]map[string]interface{}),
 		methodConfigs:          make(map[string]*MethodConfig),
-	}
+		HandleMethodNotAllowed: true,
-	if err := engine.SetConfig(conf); err != nil {
+		injections:             make([]injection, 0),
-		panic(err)
 	}
 	engine.RouterGroup.engine = engine
 	// NOTE add prometheus monitor location
 	engine.addRoute("GET", "/metrics", monitor())
 	engine.addRoute("GET", "/metadata", engine.metadata())
+	engine.NoRoute(func(c *Context) {
+		c.Bytes(404, "text/plain", default404Body)
+		c.Abort()
+	})
+	engine.NoMethod(func(c *Context) {
+		c.Bytes(405, "text/plain", []byte(http.StatusText(405)))
+		c.Abort()
+	})
 	startPerf()
 	return engine
 }
@@ -196,46 +231,60 @@ func (engine *Engine) addRoute(method, path string, handlers ...HandlerFunc) {
 		engine.metastore[path] = make(map[string]interface{})
 	}
 	engine.metastore[path]["method"] = method
-	engine.mux.HandleFunc(path, func(w http.ResponseWriter, req *http.Request) {
+	root := engine.trees.get(method)
-		c := &Context{
+	if root == nil {
-			Context:  nil,
+		root = new(node)
-			engine:   engine,
+		engine.trees = append(engine.trees, methodTree{method: method, root: root})
-			index:    -1,
-			handlers: nil,
-			Keys:     nil,
-			method:   "",
-			Error:    nil,
 	}
 
-		c.Request = req
+	prelude := func(c *Context) {
-		c.Writer = w
-		c.handlers = handlers
 		c.method = method
-
+		c.RoutePath = path
-		engine.handleContext(c)
+	}
-	})
+	handlers = append([]HandlerFunc{prelude}, handlers...)
+	root.addRoute(path, handlers)
 }
 
-// SetConfig is used to set the engine configuration.
+func (engine *Engine) prepareHandler(c *Context) {
-// Only the valid config will be loaded.
+	httpMethod := c.Request.Method
-func (engine *Engine) SetConfig(conf *ServerConfig) (err error) {
+	rPath := c.Request.URL.Path
-	if conf.Timeout <= 0 {
+	unescape := false
-		return errors.New("blademaster: config timeout must greater than 0")
+	if engine.UseRawPath && len(c.Request.URL.RawPath) > 0 {
+		rPath = c.Request.URL.RawPath
+		unescape = engine.UnescapePathValues
+	}
+	rPath = cleanPath(rPath)
+
+	// Find root of the tree for the given HTTP method
+	t := engine.trees
+	for i, tl := 0, len(t); i < tl; i++ {
+		if t[i].method != httpMethod {
+			continue
+		}
+		root := t[i].root
+		// Find route in tree
+		handlers, params, _ := root.getValue(rPath, c.Params, unescape)
+		if handlers != nil {
+			c.handlers = handlers
+			c.Params = params
+			return
 		}
-	if conf.Network == "" {
+		break
-		conf.Network = "tcp"
 	}
-	engine.lock.Lock()
-	engine.conf = conf
-	engine.lock.Unlock()
-	return
-}
 
-func (engine *Engine) methodConfig(path string) *MethodConfig {
+	if engine.HandleMethodNotAllowed {
-	engine.pcLock.RLock()
+		for _, tree := range engine.trees {
-	mc := engine.methodConfigs[path]
+			if tree.method == httpMethod {
-	engine.pcLock.RUnlock()
+				continue
-	return mc
+			}
+			if handlers, _, _ := tree.root.getValue(rPath, nil, unescape); handlers != nil {
+				c.handlers = engine.allNoMethod
+				return
+			}
+		}
+	}
+	c.handlers = engine.allNoRoute
+	return
 }
 
 func (engine *Engine) handleContext(c *Context) {
@@ -274,12 +323,35 @@ func (engine *Engine) handleContext(c *Context) {
 		c.Context, cancel = context.WithCancel(ctx)
 	}
 	defer cancel()
+	engine.prepareHandler(c)
 	c.Next()
 }
 
+// SetConfig is used to set the engine configuration.
+// Only the valid config will be loaded.
+func (engine *Engine) SetConfig(conf *ServerConfig) (err error) {
+	if conf.Timeout <= 0 {
+		return errors.New("blademaster: config timeout must greater than 0")
+	}
+	if conf.Network == "" {
+		conf.Network = "tcp"
+	}
+	engine.lock.Lock()
+	engine.conf = conf
+	engine.lock.Unlock()
+	return
+}
+
+func (engine *Engine) methodConfig(path string) *MethodConfig {
+	engine.pcLock.RLock()
+	mc := engine.methodConfigs[path]
+	engine.pcLock.RUnlock()
+	return mc
+}
+
 // Router return a http.Handler for using http.ListenAndServe() directly.
 func (engine *Engine) Router() http.Handler {
-	return engine.mux
+	return engine
 }
 
 // Server is used to load stored http server.
@@ -305,6 +377,8 @@ func (engine *Engine) Shutdown(ctx context.Context) error {
 // For example, this is the right place for a logger or error management middleware.
 func (engine *Engine) UseFunc(middleware ...HandlerFunc) IRoutes {
 	engine.RouterGroup.UseFunc(middleware...)
+	engine.rebuild404Handlers()
+	engine.rebuild405Handlers()
 	return engine
 }
 
@@ -333,7 +407,7 @@ func (engine *Engine) Run(addr ...string) (err error) {
 	address := resolveAddress(addr)
 	server := &http.Server{
 		Addr:    address,
-		Handler: engine.mux,
+		Handler: engine,
 	}
 	engine.server.Store(server)
 	if err = server.ListenAndServe(); err != nil {
@@ -348,7 +422,7 @@ func (engine *Engine) Run(addr ...string) (err error) {
 func (engine *Engine) RunTLS(addr, certFile, keyFile string) (err error) {
 	server := &http.Server{
 		Addr:    addr,
-		Handler: engine.mux,
+		Handler: engine,
 	}
 	engine.server.Store(server)
 	if err = server.ListenAndServeTLS(certFile, keyFile); err != nil {
@@ -369,7 +443,7 @@ func (engine *Engine) RunUnix(file string) (err error) {
 	}
 	defer listener.Close()
 	server := &http.Server{
-		Handler: engine.mux,
+		Handler: engine,
 	}
 	engine.server.Store(server)
 	if err = server.Serve(listener); err != nil {
@@ -381,7 +455,7 @@ func (engine *Engine) RunUnix(file string) (err error) {
 // RunServer will serve and start listening HTTP requests by given server and listener.
 // Note: this method will block the calling goroutine indefinitely unless an error happens.
 func (engine *Engine) RunServer(server *http.Server, l net.Listener) (err error) {
-	server.Handler = engine.mux
+	server.Handler = engine
 	engine.server.Store(server)
 	if err = server.Serve(l); err != nil {
 		err = errors.Wrapf(err, "listen server: %+v/%+v", server, l)
@@ -403,3 +477,41 @@ func (engine *Engine) Inject(pattern string, handlers ...HandlerFunc) {
 		handlers: handlers,
 	})
 }
+
+// ServeHTTP conforms to the http.Handler interface.
+func (engine *Engine) ServeHTTP(w http.ResponseWriter, req *http.Request) {
+	c := &Context{
+		Context:  nil,
+		engine:   engine,
+		index:    -1,
+		handlers: nil,
+		Keys:     nil,
+		method:   "",
+		Error:    nil,
+	}
+
+	c.Request = req
+	c.Writer = w
+
+	engine.handleContext(c)
+}
+
+// NoRoute adds handlers for NoRoute. It return a 404 code by default.
+func (engine *Engine) NoRoute(handlers ...HandlerFunc) {
+	engine.noRoute = handlers
+	engine.rebuild404Handlers()
+}
+
+// NoMethod sets the handlers called when... TODO.
+func (engine *Engine) NoMethod(handlers ...HandlerFunc) {
+	engine.noMethod = handlers
+	engine.rebuild405Handlers()
+}
+
+func (engine *Engine) rebuild404Handlers() {
+	engine.allNoRoute = engine.combineHandlers(engine.noRoute)
+}
+
+func (engine *Engine) rebuild405Handlers() {
+	engine.allNoMethod = engine.combineHandlers(engine.noMethod)
+}

pkg/net/http/blademaster/tree.go

@@ -0,0 +1,627 @@
+// Copyright 2013 Julien Schmidt. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be found
+// at https://github.com/julienschmidt/httprouter/blob/master/LICENSE
+
+package blademaster
+
+import (
+"net/url"
+"strings"
+"unicode"
+)
+
+// Param is a single URL parameter, consisting of a key and a value.
+type Param struct {
+	Key   string
+	Value string
+}
+
+// Params is a Param-slice, as returned by the router.
+// The slice is ordered, the first URL parameter is also the first slice value.
+// It is therefore safe to read values by the index.
+type Params []Param
+
+// Get returns the value of the first Param which key matches the given name.
+// If no matching Param is found, an empty string is returned.
+func (ps Params) Get(name string) (string, bool) {
+	for _, entry := range ps {
+		if entry.Key == name {
+			return entry.Value, true
+		}
+	}
+	return "", false
+}
+
+// ByName returns the value of the first Param which key matches the given name.
+// If no matching Param is found, an empty string is returned.
+func (ps Params) ByName(name string) (va string) {
+	va, _ = ps.Get(name)
+	return
+}
+
+type methodTree struct {
+	method string
+	root   *node
+}
+
+type methodTrees []methodTree
+
+func (trees methodTrees) get(method string) *node {
+	for _, tree := range trees {
+		if tree.method == method {
+			return tree.root
+		}
+	}
+	return nil
+}
+
+func min(a, b int) int {
+	if a <= b {
+		return a
+	}
+	return b
+}
+
+func countParams(path string) uint8 {
+	var n uint
+	for i := 0; i < len(path); i++ {
+		if path[i] != ':' && path[i] != '*' {
+			continue
+		}
+		n++
+	}
+	if n >= 255 {
+		return 255
+	}
+	return uint8(n)
+}
+
+type nodeType uint8
+
+const (
+	static nodeType = iota // default
+	root
+	param
+	catchAll
+)
+
+type node struct {
+	path      string
+	indices   string
+	children  []*node
+	handlers  []HandlerFunc
+	priority  uint32
+	nType     nodeType
+	maxParams uint8
+	wildChild bool
+}
+
+// increments priority of the given child and reorders if necessary.
+func (n *node) incrementChildPrio(pos int) int {
+	n.children[pos].priority++
+	prio := n.children[pos].priority
+
+	// adjust position (move to front)
+	newPos := pos
+	for newPos > 0 && n.children[newPos-1].priority < prio {
+		// swap node positions
+		n.children[newPos-1], n.children[newPos] = n.children[newPos], n.children[newPos-1]
+
+		newPos--
+	}
+
+	// build new index char string
+	if newPos != pos {
+		n.indices = n.indices[:newPos] + // unchanged prefix, might be empty
+			n.indices[pos:pos+1] + // the index char we move
+			n.indices[newPos:pos] + n.indices[pos+1:] // rest without char at 'pos'
+	}
+
+	return newPos
+}
+
+// addRoute adds a node with the given handle to the path.
+// Not concurrency-safe!
+func (n *node) addRoute(path string, handlers []HandlerFunc) {
+	fullPath := path
+	n.priority++
+	numParams := countParams(path)
+
+	// non-empty tree
+	if len(n.path) > 0 || len(n.children) > 0 {
+	walk:
+		for {
+			// Update maxParams of the current node
+			if numParams > n.maxParams {
+				n.maxParams = numParams
+			}
+
+			// Find the longest common prefix.
+			// This also implies that the common prefix contains no ':' or '*'
+			// since the existing key can't contain those chars.
+			i := 0
+			max := min(len(path), len(n.path))
+			for i < max && path[i] == n.path[i] {
+				i++
+			}
+
+			// Split edge
+			if i < len(n.path) {
+				child := node{
+					path:      n.path[i:],
+					wildChild: n.wildChild,
+					indices:   n.indices,
+					children:  n.children,
+					handlers:  n.handlers,
+					priority:  n.priority - 1,
+				}
+
+				// Update maxParams (max of all children)
+				for i := range child.children {
+					if child.children[i].maxParams > child.maxParams {
+						child.maxParams = child.children[i].maxParams
+					}
+				}
+
+				n.children = []*node{&child}
+				// []byte for proper unicode char conversion, see #65
+				n.indices = string([]byte{n.path[i]})
+				n.path = path[:i]
+				n.handlers = nil
+				n.wildChild = false
+			}
+
+			// Make new node a child of this node
+			if i < len(path) {
+				path = path[i:]
+
+				if n.wildChild {
+					n = n.children[0]
+					n.priority++
+
+					// Update maxParams of the child node
+					if numParams > n.maxParams {
+						n.maxParams = numParams
+					}
+					numParams--
+
+					// Check if the wildcard matches
+					if len(path) >= len(n.path) && n.path == path[:len(n.path)] {
+						// check for longer wildcard, e.g. :name and :names
+						if len(n.path) >= len(path) || path[len(n.path)] == '/' {
+							continue walk
+						}
+					}
+
+					pathSeg := path
+					if n.nType != catchAll {
+						pathSeg = strings.SplitN(path, "/", 2)[0]
+					}
+					prefix := fullPath[:strings.Index(fullPath, pathSeg)] + n.path
+					panic("'" + pathSeg +
+						"' in new path '" + fullPath +
+						"' conflicts with existing wildcard '" + n.path +
+						"' in existing prefix '" + prefix +
+						"'")
+				}
+
+				c := path[0]
+
+				// slash after param
+				if n.nType == param && c == '/' && len(n.children) == 1 {
+					n = n.children[0]
+					n.priority++
+					continue walk
+				}
+
+				// Check if a child with the next path byte exists
+				for i := 0; i < len(n.indices); i++ {
+					if c == n.indices[i] {
+						i = n.incrementChildPrio(i)
+						n = n.children[i]
+						continue walk
+					}
+				}
+
+				// Otherwise insert it
+				if c != ':' && c != '*' {
+					// []byte for proper unicode char conversion, see #65
+					n.indices += string([]byte{c})
+					child := &node{
+						maxParams: numParams,
+					}
+					n.children = append(n.children, child)
+					n.incrementChildPrio(len(n.indices) - 1)
+					n = child
+				}
+				n.insertChild(numParams, path, fullPath, handlers)
+				return
+
+			} else if i == len(path) { // Make node a (in-path) leaf
+				if n.handlers != nil {
+					panic("handlers are already registered for path '" + fullPath + "'")
+				}
+				n.handlers = handlers
+			}
+			return
+		}
+	} else { // Empty tree
+		n.insertChild(numParams, path, fullPath, handlers)
+		n.nType = root
+	}
+}
+
+func (n *node) insertChild(numParams uint8, path string, fullPath string, handlers []HandlerFunc) {
+	var offset int // already handled bytes of the path
+
+	// find prefix until first wildcard (beginning with ':' or '*')
+	for i, max := 0, len(path); numParams > 0; i++ {
+		c := path[i]
+		if c != ':' && c != '*' {
+			continue
+		}
+
+		// find wildcard end (either '/' or path end)
+		end := i + 1
+		for end < max && path[end] != '/' {
+			switch path[end] {
+			// the wildcard name must not contain ':' and '*'
+			case ':', '*':
+				panic("only one wildcard per path segment is allowed, has: '" +
+					path[i:] + "' in path '" + fullPath + "'")
+			default:
+				end++
+			}
+		}
+
+		// check if this Node existing children which would be
+		// unreachable if we insert the wildcard here
+		if len(n.children) > 0 {
+			panic("wildcard route '" + path[i:end] +
+				"' conflicts with existing children in path '" + fullPath + "'")
+		}
+
+		// check if the wildcard has a name
+		if end-i < 2 {
+			panic("wildcards must be named with a non-empty name in path '" + fullPath + "'")
+		}
+
+		if c == ':' { // param
+			// split path at the beginning of the wildcard
+			if i > 0 {
+				n.path = path[offset:i]
+				offset = i
+			}
+
+			child := &node{
+				nType:     param,
+				maxParams: numParams,
+			}
+			n.children = []*node{child}
+			n.wildChild = true
+			n = child
+			n.priority++
+			numParams--
+
+			// if the path doesn't end with the wildcard, then there
+			// will be another non-wildcard subpath starting with '/'
+			if end < max {
+				n.path = path[offset:end]
+				offset = end
+
+				child := &node{
+					maxParams: numParams,
+					priority:  1,
+				}
+				n.children = []*node{child}
+				n = child
+			}
+
+		} else { // catchAll
+			if end != max || numParams > 1 {
+				panic("catch-all routes are only allowed at the end of the path in path '" + fullPath + "'")
+			}
+
+			if len(n.path) > 0 && n.path[len(n.path)-1] == '/' {
+				panic("catch-all conflicts with existing handle for the path segment root in path '" + fullPath + "'")
+			}
+
+			// currently fixed width 1 for '/'
+			i--
+			if path[i] != '/' {
+				panic("no / before catch-all in path '" + fullPath + "'")
+			}
+
+			n.path = path[offset:i]
+
+			// first node: catchAll node with empty path
+			child := &node{
+				wildChild: true,
+				nType:     catchAll,
+				maxParams: 1,
+			}
+			n.children = []*node{child}
+			n.indices = string(path[i])
+			n = child
+			n.priority++
+
+			// second node: node holding the variable
+			child = &node{
+				path:      path[i:],
+				nType:     catchAll,
+				maxParams: 1,
+				handlers:  handlers,
+				priority:  1,
+			}
+			n.children = []*node{child}
+
+			return
+		}
+	}
+
+	// insert remaining path part and handle to the leaf
+	n.path = path[offset:]
+	n.handlers = handlers
+}
+
+// getValue returns the handle registered with the given path (key). The values of
+// wildcards are saved to a map.
+// If no handle can be found, a TSR (trailing slash redirect) recommendation is
+// made if a handle exists with an extra (without the) trailing slash for the
+// given path.
+func (n *node) getValue(path string, po Params, unescape bool) (handlers []HandlerFunc, p Params, tsr bool) {
+	p = po
+walk: // Outer loop for walking the tree
+	for {
+		if len(path) > len(n.path) {
+			if path[:len(n.path)] == n.path {
+				path = path[len(n.path):]
+				// If this node does not have a wildcard (param or catchAll)
+				// child,  we can just look up the next child node and continue
+				// to walk down the tree
+				if !n.wildChild {
+					c := path[0]
+					for i := 0; i < len(n.indices); i++ {
+						if c == n.indices[i] {
+							n = n.children[i]
+							continue walk
+						}
+					}
+
+					// Nothing found.
+					// We can recommend to redirect to the same URL without a
+					// trailing slash if a leaf exists for that path.
+					tsr = path == "/" && n.handlers != nil
+					return
+				}
+
+				// handle wildcard child
+				n = n.children[0]
+				switch n.nType {
+				case param:
+					// find param end (either '/' or path end)
+					end := 0
+					for end < len(path) && path[end] != '/' {
+						end++
+					}
+
+					// save param value
+					if cap(p) < int(n.maxParams) {
+						p = make(Params, 0, n.maxParams)
+					}
+					i := len(p)
+					p = p[:i+1] // expand slice within preallocated capacity
+					p[i].Key = n.path[1:]
+					val := path[:end]
+					if unescape {
+						var err error
+						if p[i].Value, err = url.QueryUnescape(val); err != nil {
+							p[i].Value = val // fallback, in case of error
+						}
+					} else {
+						p[i].Value = val
+					}
+
+					// we need to go deeper!
+					if end < len(path) {
+						if len(n.children) > 0 {
+							path = path[end:]
+							n = n.children[0]
+							continue walk
+						}
+
+						// ... but we can't
+						tsr = len(path) == end+1
+						return
+					}
+
+					if handlers = n.handlers; handlers != nil {
+						return
+					}
+					if len(n.children) == 1 {
+						// No handle found. Check if a handle for this path + a
+						// trailing slash exists for TSR recommendation
+						n = n.children[0]
+						tsr = n.path == "/" && n.handlers != nil
+					}
+
+					return
+
+				case catchAll:
+					// save param value
+					if cap(p) < int(n.maxParams) {
+						p = make(Params, 0, n.maxParams)
+					}
+					i := len(p)
+					p = p[:i+1] // expand slice within preallocated capacity
+					p[i].Key = n.path[2:]
+					if unescape {
+						var err error
+						if p[i].Value, err = url.QueryUnescape(path); err != nil {
+							p[i].Value = path // fallback, in case of error
+						}
+					} else {
+						p[i].Value = path
+					}
+
+					handlers = n.handlers
+					return
+
+				default:
+					panic("invalid node type")
+				}
+			}
+		} else if path == n.path {
+			// We should have reached the node containing the handle.
+			// Check if this node has a handle registered.
+			if handlers = n.handlers; handlers != nil {
+				return
+			}
+
+			if path == "/" && n.wildChild && n.nType != root {
+				tsr = true
+				return
+			}
+
+			// No handle found. Check if a handle for this path + a
+			// trailing slash exists for trailing slash recommendation
+			for i := 0; i < len(n.indices); i++ {
+				if n.indices[i] == '/' {
+					n = n.children[i]
+					tsr = (len(n.path) == 1 && n.handlers != nil) ||
+						(n.nType == catchAll && n.children[0].handlers != nil)
+					return
+				}
+			}
+
+			return
+		}
+
+		// Nothing found. We can recommend to redirect to the same URL with an
+		// extra trailing slash if a leaf exists for that path
+		tsr = (path == "/") ||
+			(len(n.path) == len(path)+1 && n.path[len(path)] == '/' &&
+				path == n.path[:len(n.path)-1] && n.handlers != nil)
+		return
+	}
+}
+
+// findCaseInsensitivePath makes a case-insensitive lookup of the given path and tries to find a handler.
+// It can optionally also fix trailing slashes.
+// It returns the case-corrected path and a bool indicating whether the lookup
+// was successful.
+func (n *node) findCaseInsensitivePath(path string, fixTrailingSlash bool) (ciPath []byte, found bool) {
+	ciPath = make([]byte, 0, len(path)+1) // preallocate enough memory
+
+	// Outer loop for walking the tree
+	for len(path) >= len(n.path) && strings.ToLower(path[:len(n.path)]) == strings.ToLower(n.path) {
+		path = path[len(n.path):]
+		ciPath = append(ciPath, n.path...)
+
+		if len(path) > 0 {
+			// If this node does not have a wildcard (param or catchAll) child,
+			// we can just look up the next child node and continue to walk down
+			// the tree
+			if !n.wildChild {
+				r := unicode.ToLower(rune(path[0]))
+				for i, index := range n.indices {
+					// must use recursive approach since both index and
+					// ToLower(index) could exist. We must check both.
+					if r == unicode.ToLower(index) {
+						out, found := n.children[i].findCaseInsensitivePath(path, fixTrailingSlash)
+						if found {
+							return append(ciPath, out...), true
+						}
+					}
+				}
+
+				// Nothing found. We can recommend to redirect to the same URL
+				// without a trailing slash if a leaf exists for that path
+				found = fixTrailingSlash && path == "/" && n.handlers != nil
+				return
+			}
+
+			n = n.children[0]
+			switch n.nType {
+			case param:
+				// find param end (either '/' or path end)
+				k := 0
+				for k < len(path) && path[k] != '/' {
+					k++
+				}
+
+				// add param value to case insensitive path
+				ciPath = append(ciPath, path[:k]...)
+
+				// we need to go deeper!
+				if k < len(path) {
+					if len(n.children) > 0 {
+						path = path[k:]
+						n = n.children[0]
+						continue
+					}
+
+					// ... but we can't
+					if fixTrailingSlash && len(path) == k+1 {
+						return ciPath, true
+					}
+					return
+				}
+
+				if n.handlers != nil {
+					return ciPath, true
+				} else if fixTrailingSlash && len(n.children) == 1 {
+					// No handle found. Check if a handle for this path + a
+					// trailing slash exists
+					n = n.children[0]
+					if n.path == "/" && n.handlers != nil {
+						return append(ciPath, '/'), true
+					}
+				}
+				return
+
+			case catchAll:
+				return append(ciPath, path...), true
+
+			default:
+				panic("invalid node type")
+			}
+		} else {
+			// We should have reached the node containing the handle.
+			// Check if this node has a handle registered.
+			if n.handlers != nil {
+				return ciPath, true
+			}
+
+			// No handle found.
+			// Try to fix the path by adding a trailing slash
+			if fixTrailingSlash {
+				for i := 0; i < len(n.indices); i++ {
+					if n.indices[i] == '/' {
+						n = n.children[i]
+						if (len(n.path) == 1 && n.handlers != nil) ||
+							(n.nType == catchAll && n.children[0].handlers != nil) {
+							return append(ciPath, '/'), true
+						}
+						return
+					}
+				}
+			}
+			return
+		}
+	}
+
+	// Nothing found.
+	// Try to fix the path by adding / removing a trailing slash
+	if fixTrailingSlash {
+		if path == "/" {
+			return ciPath, true
+		}
+		if len(path)+1 == len(n.path) && n.path[len(path)] == '/' &&
+			strings.ToLower(path) == strings.ToLower(n.path[:len(path)]) &&
+			n.handlers != nil {
+			return append(ciPath, n.path...), true
+		}
+	}
+	return
+}

pkg/net/http/blademaster/utils.go

@@ -29,8 +29,10 @@ func resolveAddress(addr []string) string {
 	switch len(addr) {
 	case 0:
 		if port := os.Getenv("PORT"); port != "" {
+			//debugPrint("Environment variable PORT=\"%s\"", port)
 			return ":" + port
 		}
+		//debugPrint("Environment variable PORT is undefined. Using port :8080 by default")
 		return ":8080"
 	case 1:
 		return addr[0]
@@ -38,3 +40,120 @@ func resolveAddress(addr []string) string {
 		panic("too much parameters")
 	}
 }
+
+// cleanPath is the URL version of path.Clean, it returns a canonical URL path
+// for p, eliminating . and .. elements.
+//
+// The following rules are applied iteratively until no further processing can
+// be done:
+//	1. Replace multiple slashes with a single slash.
+//	2. Eliminate each . path name element (the current directory).
+//	3. Eliminate each inner .. path name element (the parent directory)
+//	   along with the non-.. element that precedes it.
+//	4. Eliminate .. elements that begin a rooted path:
+//	   that is, replace "/.." by "/" at the beginning of a path.
+//
+// If the result of this process is an empty string, "/" is returned.
+func cleanPath(p string) string {
+	// Turn empty string into "/"
+	if p == "" {
+		return "/"
+	}
+
+	n := len(p)
+	var buf []byte
+
+	// Invariants:
+	//      reading from path; r is index of next byte to process.
+	//      writing to buf; w is index of next byte to write.
+
+	// path must start with '/'
+	r := 1
+	w := 1
+
+	if p[0] != '/' {
+		r = 0
+		buf = make([]byte, n+1)
+		buf[0] = '/'
+	}
+
+	trailing := n > 1 && p[n-1] == '/'
+
+	// A bit more clunky without a 'lazybuf' like the path package, but the loop
+	// gets completely inlined (bufApp). So in contrast to the path package this
+	// loop has no expensive function calls (except 1x make)
+
+	for r < n {
+		switch {
+		case p[r] == '/':
+			// empty path element, trailing slash is added after the end
+			r++
+
+		case p[r] == '.' && r+1 == n:
+			trailing = true
+			r++
+
+		case p[r] == '.' && p[r+1] == '/':
+			// . element
+			r += 2
+
+		case p[r] == '.' && p[r+1] == '.' && (r+2 == n || p[r+2] == '/'):
+			// .. element: remove to last /
+			r += 3
+
+			if w > 1 {
+				// can backtrack
+				w--
+
+				if buf == nil {
+					for w > 1 && p[w] != '/' {
+						w--
+					}
+				} else {
+					for w > 1 && buf[w] != '/' {
+						w--
+					}
+				}
+			}
+
+		default:
+			// real path element.
+			// add slash if needed
+			if w > 1 {
+				bufApp(&buf, p, w, '/')
+				w++
+			}
+
+			// copy element
+			for r < n && p[r] != '/' {
+				bufApp(&buf, p, w, p[r])
+				w++
+				r++
+			}
+		}
+	}
+
+	// re-append trailing slash
+	if trailing && w > 1 {
+		bufApp(&buf, p, w, '/')
+		w++
+	}
+
+	if buf == nil {
+		return p[:w]
+	}
+	return string(buf[:w])
+}
+
+// internal helper to lazily create a buffer if necessary.
+func bufApp(buf *[]byte, s string, w int, c byte) {
+	if *buf == nil {
+		if s[w] == c {
+			return
+		}
+
+		*buf = make([]byte, len(s))
+		copy(*buf, s[:w])
+	}
+	(*buf)[w] = c
+}