From 3fe928994b7ba7ed16b0c5114ca82a9dafa7a974 Mon Sep 17 00:00:00 2001 From: Zhu Xi Date: Sat, 23 Oct 2021 11:58:57 +0800 Subject: [PATCH] Update the code logic for latestNode in tree.go (#2897) --- context.go | 6 ++- gin.go | 12 +++-- gin_integration_test.go | 15 ++++++ tree.go | 117 ++++++++++++++++++++++++++-------------- tree_test.go | 22 +++++--- 5 files changed, 120 insertions(+), 52 deletions(-) diff --git a/context.go b/context.go index bea95cc..bc2c38e 100644 --- a/context.go +++ b/context.go @@ -55,8 +55,9 @@ type Context struct { index int8 fullPath string - engine *Engine - params *Params + engine *Engine + params *Params + skippedNodes *[]skippedNode // This mutex protect Keys map mu sync.RWMutex @@ -99,6 +100,7 @@ func (c *Context) reset() { c.queryCache = nil c.formCache = nil *c.params = (*c.params)[:0] + *c.skippedNodes = (*c.skippedNodes)[:0] } // Copy returns a copy of the current context that can be safely used outside the request's scope. diff --git a/gin.go b/gin.go index af83161..1774717 100644 --- a/gin.go +++ b/gin.go @@ -144,6 +144,7 @@ type Engine struct { pool sync.Pool trees methodTrees maxParams uint16 + maxSections uint16 trustedProxies []string trustedCIDRs []*net.IPNet } @@ -200,7 +201,8 @@ func Default() *Engine { func (engine *Engine) allocateContext() *Context { v := make(Params, 0, engine.maxParams) - return &Context{engine: engine, params: &v} + skippedNodes := make([]skippedNode, 0, engine.maxSections) + return &Context{engine: engine, params: &v, skippedNodes: &skippedNodes} } // Delims sets template left and right delims and returns a Engine instance. @@ -306,6 +308,10 @@ func (engine *Engine) addRoute(method, path string, handlers HandlersChain) { if paramsCount := countParams(path); paramsCount > engine.maxParams { engine.maxParams = paramsCount } + + if sectionsCount := countSections(path); sectionsCount > engine.maxSections { + engine.maxSections = sectionsCount + } } // Routes returns a slice of registered routes, including some useful information, such as: @@ -539,7 +545,7 @@ func (engine *Engine) handleHTTPRequest(c *Context) { } root := t[i].root // Find route in tree - value := root.getValue(rPath, c.params, unescape) + value := root.getValue(rPath, c.params, c.skippedNodes, unescape) if value.params != nil { c.Params = *value.params } @@ -567,7 +573,7 @@ func (engine *Engine) handleHTTPRequest(c *Context) { if tree.method == httpMethod { continue } - if value := tree.root.getValue(rPath, nil, unescape); value.handlers != nil { + if value := tree.root.getValue(rPath, nil, c.skippedNodes, unescape); value.handlers != nil { c.handlers = engine.allNoMethod serveError(c, http.StatusMethodNotAllowed, default405Body) return diff --git a/gin_integration_test.go b/gin_integration_test.go index 0b67b54..8c22e7b 100644 --- a/gin_integration_test.go +++ b/gin_integration_test.go @@ -408,8 +408,13 @@ func TestTreeRunDynamicRouting(t *testing.T) { router.GET("/ab/*xx", func(c *Context) { c.String(http.StatusOK, "/ab/*xx") }) router.GET("/", func(c *Context) { c.String(http.StatusOK, "home") }) router.GET("/:cc", func(c *Context) { c.String(http.StatusOK, "/:cc") }) + router.GET("/c1/:dd/e", func(c *Context) { c.String(http.StatusOK, "/c1/:dd/e") }) + router.GET("/c1/:dd/e1", func(c *Context) { c.String(http.StatusOK, "/c1/:dd/e1") }) + router.GET("/c1/:dd/f1", func(c *Context) { c.String(http.StatusOK, "/c1/:dd/f1") }) + router.GET("/c1/:dd/f2", func(c *Context) { c.String(http.StatusOK, "/c1/:dd/f2") }) router.GET("/:cc/cc", func(c *Context) { c.String(http.StatusOK, "/:cc/cc") }) router.GET("/:cc/:dd/ee", func(c *Context) { c.String(http.StatusOK, "/:cc/:dd/ee") }) + router.GET("/:cc/:dd/f", func(c *Context) { c.String(http.StatusOK, "/:cc/:dd/f") }) router.GET("/:cc/:dd/:ee/ff", func(c *Context) { c.String(http.StatusOK, "/:cc/:dd/:ee/ff") }) router.GET("/:cc/:dd/:ee/:ff/gg", func(c *Context) { c.String(http.StatusOK, "/:cc/:dd/:ee/:ff/gg") }) router.GET("/:cc/:dd/:ee/:ff/:gg/hh", func(c *Context) { c.String(http.StatusOK, "/:cc/:dd/:ee/:ff/:gg/hh") }) @@ -446,6 +451,10 @@ func TestTreeRunDynamicRouting(t *testing.T) { testRequest(t, ts.URL+"/all", "", "/:cc") testRequest(t, ts.URL+"/all/cc", "", "/:cc/cc") testRequest(t, ts.URL+"/a/cc", "", "/:cc/cc") + testRequest(t, ts.URL+"/c1/d/e", "", "/c1/:dd/e") + testRequest(t, ts.URL+"/c1/d/e1", "", "/c1/:dd/e1") + testRequest(t, ts.URL+"/c1/d/ee", "", "/:cc/:dd/ee") + testRequest(t, ts.URL+"/c1/d/f", "", "/:cc/:dd/f") testRequest(t, ts.URL+"/c/d/ee", "", "/:cc/:dd/ee") testRequest(t, ts.URL+"/c/d/e/ff", "", "/:cc/:dd/:ee/ff") testRequest(t, ts.URL+"/c/d/e/f/gg", "", "/:cc/:dd/:ee/:ff/gg") @@ -528,6 +537,12 @@ func TestTreeRunDynamicRouting(t *testing.T) { testRequest(t, ts.URL+"/get/abc/123abf/testss", "", "/get/abc/123abf/:param") testRequest(t, ts.URL+"/get/abc/123abfff/te", "", "/get/abc/123abfff/:param") // 404 not found + testRequest(t, ts.URL+"/c/d/e", "404 Not Found") + testRequest(t, ts.URL+"/c/d/e1", "404 Not Found") + testRequest(t, ts.URL+"/c/d/eee", "404 Not Found") + testRequest(t, ts.URL+"/c1/d/eee", "404 Not Found") + testRequest(t, ts.URL+"/c1/d/e2", "404 Not Found") + testRequest(t, ts.URL+"/cc/dd/ee/ff/gg/hh1", "404 Not Found") testRequest(t, ts.URL+"/a/dd", "404 Not Found") testRequest(t, ts.URL+"/addr/dd/aa", "404 Not Found") testRequest(t, ts.URL+"/something/secondthing/121", "404 Not Found") diff --git a/tree.go b/tree.go index fb0a593..c8a7548 100644 --- a/tree.go +++ b/tree.go @@ -17,6 +17,7 @@ import ( var ( strColon = []byte(":") strStar = []byte("*") + strSlash = []byte("/") ) // Param is a single URL parameter, consisting of a key and a value. @@ -98,6 +99,11 @@ func countParams(path string) uint16 { return n } +func countSections(path string) uint16 { + s := bytesconv.StringToBytes(path) + return uint16(bytes.Count(s, strSlash)) +} + type nodeType uint8 const ( @@ -393,16 +399,19 @@ type nodeValue struct { fullPath string } +type skippedNode struct { + path string + node *node + paramsCount int16 +} + // 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, params *Params, unescape bool) (value nodeValue) { - var ( - skippedPath string - latestNode = n // Caching the latest node - ) +func (n *node) getValue(path string, params *Params, skippedNodes *[]skippedNode, unescape bool) (value nodeValue) { + var globalParamsCount int16 walk: // Outer loop for walking the tree for { @@ -417,15 +426,20 @@ walk: // Outer loop for walking the tree if c == idxc { // strings.HasPrefix(n.children[len(n.children)-1].path, ":") == n.wildChild if n.wildChild { - skippedPath = prefix + path - latestNode = &node{ - path: n.path, - wildChild: n.wildChild, - nType: n.nType, - priority: n.priority, - children: n.children, - handlers: n.handlers, - fullPath: n.fullPath, + index := len(*skippedNodes) + *skippedNodes = (*skippedNodes)[:index+1] + (*skippedNodes)[index] = skippedNode{ + path: prefix + path, + node: &node{ + path: n.path, + wildChild: n.wildChild, + nType: n.nType, + priority: n.priority, + children: n.children, + handlers: n.handlers, + fullPath: n.fullPath, + }, + paramsCount: globalParamsCount, } } @@ -434,10 +448,22 @@ walk: // Outer loop for walking the tree } } // If the path at the end of the loop is not equal to '/' and the current node has no child nodes - // the current node needs to be equal to the latest matching node - matched := path != "/" && !n.wildChild - if matched { - n = latestNode + // the current node needs to roll back to last vaild skippedNode + + if path != "/" && !n.wildChild { + for l := len(*skippedNodes); l > 0; { + skippedNode := (*skippedNodes)[l-1] + *skippedNodes = (*skippedNodes)[:l-1] + if strings.HasSuffix(skippedNode.path, path) { + path = skippedNode.path + n = skippedNode.node + if value.params != nil { + *value.params = (*value.params)[:skippedNode.paramsCount] + } + globalParamsCount = skippedNode.paramsCount + continue walk + } + } } // If there is no wildcard pattern, recommend a redirection @@ -451,18 +477,12 @@ walk: // Outer loop for walking the tree // Handle wildcard child, which is always at the end of the array n = n.children[len(n.children)-1] + globalParamsCount++ switch n.nType { case param: // fix truncate the parameter // tree_test.go line: 204 - if matched { - path = prefix + path - // The saved path is used after the prefix route is intercepted by matching - if n.indices == "/" { - path = skippedPath[1:] - } - } // Find param end (either '/' or path end) end := 0 @@ -548,9 +568,22 @@ walk: // Outer loop for walking the tree if path == prefix { // If the current path does not equal '/' and the node does not have a registered handle and the most recently matched node has a child node - // the current node needs to be equal to the latest matching node - if latestNode.wildChild && n.handlers == nil && path != "/" { - n = latestNode.children[len(latestNode.children)-1] + // the current node needs to roll back to last vaild skippedNode + if n.handlers == nil && path != "/" { + for l := len(*skippedNodes); l > 0; { + skippedNode := (*skippedNodes)[l-1] + *skippedNodes = (*skippedNodes)[:l-1] + if strings.HasSuffix(skippedNode.path, path) { + path = skippedNode.path + n = skippedNode.node + if value.params != nil { + *value.params = (*value.params)[:skippedNode.paramsCount] + } + globalParamsCount = skippedNode.paramsCount + continue walk + } + } + // n = latestNode.children[len(latestNode.children)-1] } // We should have reached the node containing the handle. // Check if this node has a handle registered. @@ -581,19 +614,21 @@ walk: // Outer loop for walking the tree return } - if path != "/" && len(skippedPath) > 0 && strings.HasSuffix(skippedPath, path) { - path = skippedPath - // Reduce the number of cycles - n, latestNode = latestNode, n - // skippedPath cannot execute - // example: - // * /:cc/cc - // call /a/cc expectations:match/200 Actual:match/200 - // call /a/dd expectations:unmatch/404 Actual: panic - // call /addr/dd/aa expectations:unmatch/404 Actual: panic - // skippedPath: It can only be executed if the secondary route is not found - skippedPath = "" - continue walk + // roll back to last vaild skippedNode + if path != "/" { + for l := len(*skippedNodes); l > 0; { + skippedNode := (*skippedNodes)[l-1] + *skippedNodes = (*skippedNodes)[:l-1] + if strings.HasSuffix(skippedNode.path, path) { + path = skippedNode.path + n = skippedNode.node + if value.params != nil { + *value.params = (*value.params)[:skippedNode.paramsCount] + } + globalParamsCount = skippedNode.paramsCount + continue walk + } + } } // Nothing found. We can recommend to redirect to the same URL with an diff --git a/tree_test.go b/tree_test.go index 8ae5b7d..49b3b57 100644 --- a/tree_test.go +++ b/tree_test.go @@ -33,6 +33,11 @@ func getParams() *Params { return &ps } +func getSkippedNodes() *[]skippedNode { + ps := make([]skippedNode, 0, 20) + return &ps +} + func checkRequests(t *testing.T, tree *node, requests testRequests, unescapes ...bool) { unescape := false if len(unescapes) >= 1 { @@ -40,7 +45,7 @@ func checkRequests(t *testing.T, tree *node, requests testRequests, unescapes .. } for _, request := range requests { - value := tree.getValue(request.path, getParams(), unescape) + value := tree.getValue(request.path, getParams(), getSkippedNodes(), unescape) if value.handlers == nil { if !request.nilHandler { @@ -157,6 +162,8 @@ func TestTreeWildcard(t *testing.T) { "/aa/*xx", "/ab/*xx", "/:cc", + "/c1/:dd/e", + "/c1/:dd/e1", "/:cc/cc", "/:cc/:dd/ee", "/:cc/:dd/:ee/ff", @@ -238,6 +245,9 @@ func TestTreeWildcard(t *testing.T) { {"/alldd", false, "/:cc", Params{Param{Key: "cc", Value: "alldd"}}}, {"/all/cc", false, "/:cc/cc", Params{Param{Key: "cc", Value: "all"}}}, {"/a/cc", false, "/:cc/cc", Params{Param{Key: "cc", Value: "a"}}}, + {"/c1/d/e", false, "/c1/:dd/e", Params{Param{Key: "dd", Value: "d"}}}, + {"/c1/d/e1", false, "/c1/:dd/e1", Params{Param{Key: "dd", Value: "d"}}}, + {"/c1/d/ee", false, "/:cc/:dd/ee", Params{Param{Key: "cc", Value: "c1"}, Param{Key: "dd", Value: "d"}}}, {"/cc/cc", false, "/:cc/cc", Params{Param{Key: "cc", Value: "cc"}}}, {"/ccc/cc", false, "/:cc/cc", Params{Param{Key: "cc", Value: "ccc"}}}, {"/deedwjfs/cc", false, "/:cc/cc", Params{Param{Key: "cc", Value: "deedwjfs"}}}, @@ -605,7 +615,7 @@ func TestTreeTrailingSlashRedirect(t *testing.T) { "/doc/", } for _, route := range tsrRoutes { - value := tree.getValue(route, nil, false) + value := tree.getValue(route, nil, getSkippedNodes(), false) if value.handlers != nil { t.Fatalf("non-nil handler for TSR route '%s", route) } else if !value.tsr { @@ -622,7 +632,7 @@ func TestTreeTrailingSlashRedirect(t *testing.T) { "/api/world/abc", } for _, route := range noTsrRoutes { - value := tree.getValue(route, nil, false) + value := tree.getValue(route, nil, getSkippedNodes(), false) if value.handlers != nil { t.Fatalf("non-nil handler for No-TSR route '%s", route) } else if value.tsr { @@ -641,7 +651,7 @@ func TestTreeRootTrailingSlashRedirect(t *testing.T) { t.Fatalf("panic inserting test route: %v", recv) } - value := tree.getValue("/", nil, false) + value := tree.getValue("/", nil, getSkippedNodes(), false) if value.handlers != nil { t.Fatalf("non-nil handler") } else if value.tsr { @@ -821,7 +831,7 @@ func TestTreeInvalidNodeType(t *testing.T) { // normal lookup recv := catchPanic(func() { - tree.getValue("/test", nil, false) + tree.getValue("/test", nil, getSkippedNodes(), false) }) if rs, ok := recv.(string); !ok || rs != panicMsg { t.Fatalf("Expected panic '"+panicMsg+"', got '%v'", recv) @@ -846,7 +856,7 @@ func TestTreeInvalidParamsType(t *testing.T) { params := make(Params, 0) // try to trigger slice bounds out of range with capacity 0 - tree.getValue("/test", ¶ms, false) + tree.getValue("/test", ¶ms, getSkippedNodes(), false) } func TestTreeWildcardConflictEx(t *testing.T) {