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fix gin-gonic#2786 (gin-gonic#2796)
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* update match rule

* add comments

(cherry picked from commit 0a55865)
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@qm012 @Bisstocuz
qm012 authored and Bisstocuz committed Nov 22, 2021
1 parent b86d312 commit 2ad7e25
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Showing 3 changed files with 197 additions and 43 deletions.
82 changes: 82 additions & 0 deletions gin_integration_test.go
View file
Original file line number Diff line number Diff line change
Expand Up @@ -410,6 +410,25 @@ func TestTreeRunDynamicRouting(t *testing.T) {
router.GET("/get/:param/abc/", func(c *Context) { c.String(http.StatusOK, "/get/:param/abc/") })
router.GET("/something/:paramname/thirdthing", func(c *Context) { c.String(http.StatusOK, "/something/:paramname/thirdthing") })
router.GET("/something/secondthing/test", func(c *Context) { c.String(http.StatusOK, "/something/secondthing/test") })
router.GET("/get/abc", func(c *Context) { c.String(http.StatusOK, "/get/abc") })
router.GET("/get/:param", func(c *Context) { c.String(http.StatusOK, "/get/:param") })
router.GET("/get/abc/123abc", func(c *Context) { c.String(http.StatusOK, "/get/abc/123abc") })
router.GET("/get/abc/:param", func(c *Context) { c.String(http.StatusOK, "/get/abc/:param") })
router.GET("/get/abc/123abc/xxx8", func(c *Context) { c.String(http.StatusOK, "/get/abc/123abc/xxx8") })
router.GET("/get/abc/123abc/:param", func(c *Context) { c.String(http.StatusOK, "/get/abc/123abc/:param") })
router.GET("/get/abc/123abc/xxx8/1234", func(c *Context) { c.String(http.StatusOK, "/get/abc/123abc/xxx8/1234") })
router.GET("/get/abc/123abc/xxx8/:param", func(c *Context) { c.String(http.StatusOK, "/get/abc/123abc/xxx8/:param") })
router.GET("/get/abc/123abc/xxx8/1234/ffas", func(c *Context) { c.String(http.StatusOK, "/get/abc/123abc/xxx8/1234/ffas") })
router.GET("/get/abc/123abc/xxx8/1234/:param", func(c *Context) { c.String(http.StatusOK, "/get/abc/123abc/xxx8/1234/:param") })
router.GET("/get/abc/123abc/xxx8/1234/kkdd/12c", func(c *Context) { c.String(http.StatusOK, "/get/abc/123abc/xxx8/1234/kkdd/12c") })
router.GET("/get/abc/123abc/xxx8/1234/kkdd/:param", func(c *Context) { c.String(http.StatusOK, "/get/abc/123abc/xxx8/1234/kkdd/:param") })
router.GET("/get/abc/:param/test", func(c *Context) { c.String(http.StatusOK, "/get/abc/:param/test") })
router.GET("/get/abc/123abd/:param", func(c *Context) { c.String(http.StatusOK, "/get/abc/123abd/:param") })
router.GET("/get/abc/123abddd/:param", func(c *Context) { c.String(http.StatusOK, "/get/abc/123abddd/:param") })
router.GET("/get/abc/123/:param", func(c *Context) { c.String(http.StatusOK, "/get/abc/123/:param") })
router.GET("/get/abc/123abg/:param", func(c *Context) { c.String(http.StatusOK, "/get/abc/123abg/:param") })
router.GET("/get/abc/123abf/:param", func(c *Context) { c.String(http.StatusOK, "/get/abc/123abf/:param") })
router.GET("/get/abc/123abfff/:param", func(c *Context) { c.String(http.StatusOK, "/get/abc/123abfff/:param") })

ts := httptest.NewServer(router)
defer ts.Close()
Expand All @@ -424,8 +443,26 @@ func TestTreeRunDynamicRouting(t *testing.T) {
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")
testRequest(t, ts.URL+"/c/d/e/f/g/hh", "", "/:cc/:dd/:ee/:ff/:gg/hh")
testRequest(t, ts.URL+"/cc/dd/ee/ff/gg/hh", "", "/:cc/:dd/:ee/:ff/:gg/hh")
testRequest(t, ts.URL+"/a", "", "/:cc")
testRequest(t, ts.URL+"/d", "", "/:cc")
testRequest(t, ts.URL+"/ad", "", "/:cc")
testRequest(t, ts.URL+"/dd", "", "/:cc")
testRequest(t, ts.URL+"/aa", "", "/:cc")
testRequest(t, ts.URL+"/aaa", "", "/:cc")
testRequest(t, ts.URL+"/aaa/cc", "", "/:cc/cc")
testRequest(t, ts.URL+"/ab", "", "/:cc")
testRequest(t, ts.URL+"/abb", "", "/:cc")
testRequest(t, ts.URL+"/abb/cc", "", "/:cc/cc")
testRequest(t, ts.URL+"/dddaa", "", "/:cc")
testRequest(t, ts.URL+"/allxxxx", "", "/:cc")
testRequest(t, ts.URL+"/alldd", "", "/:cc")
testRequest(t, ts.URL+"/cc/cc", "", "/:cc/cc")
testRequest(t, ts.URL+"/ccc/cc", "", "/:cc/cc")
testRequest(t, ts.URL+"/deedwjfs/cc", "", "/:cc/cc")
testRequest(t, ts.URL+"/acllcc/cc", "", "/:cc/cc")
testRequest(t, ts.URL+"/get/test/abc/", "", "/get/test/abc/")
testRequest(t, ts.URL+"/get/testaa/abc/", "", "/get/:param/abc/")
testRequest(t, ts.URL+"/get/te/abc/", "", "/get/:param/abc/")
testRequest(t, ts.URL+"/get/xx/abc/", "", "/get/:param/abc/")
testRequest(t, ts.URL+"/get/tt/abc/", "", "/get/:param/abc/")
Expand All @@ -434,10 +471,55 @@ func TestTreeRunDynamicRouting(t *testing.T) {
testRequest(t, ts.URL+"/get/aa/abc/", "", "/get/:param/abc/")
testRequest(t, ts.URL+"/get/abas/abc/", "", "/get/:param/abc/")
testRequest(t, ts.URL+"/something/secondthing/test", "", "/something/secondthing/test")
testRequest(t, ts.URL+"/something/secondthingaaaa/thirdthing", "", "/something/:paramname/thirdthing")
testRequest(t, ts.URL+"/something/abcdad/thirdthing", "", "/something/:paramname/thirdthing")
testRequest(t, ts.URL+"/something/se/thirdthing", "", "/something/:paramname/thirdthing")
testRequest(t, ts.URL+"/something/s/thirdthing", "", "/something/:paramname/thirdthing")
testRequest(t, ts.URL+"/something/secondthing/thirdthing", "", "/something/:paramname/thirdthing")
testRequest(t, ts.URL+"/get/abc", "", "/get/abc")
testRequest(t, ts.URL+"/get/a", "", "/get/:param")
testRequest(t, ts.URL+"/get/abz", "", "/get/:param")
testRequest(t, ts.URL+"/get/12a", "", "/get/:param")
testRequest(t, ts.URL+"/get/abcd", "", "/get/:param")
testRequest(t, ts.URL+"/get/abc/123abc", "", "/get/abc/123abc")
testRequest(t, ts.URL+"/get/abc/12", "", "/get/abc/:param")
testRequest(t, ts.URL+"/get/abc/123ab", "", "/get/abc/:param")
testRequest(t, ts.URL+"/get/abc/xyz", "", "/get/abc/:param")
testRequest(t, ts.URL+"/get/abc/123abcddxx", "", "/get/abc/:param")
testRequest(t, ts.URL+"/get/abc/123abc/xxx8", "", "/get/abc/123abc/xxx8")
testRequest(t, ts.URL+"/get/abc/123abc/x", "", "/get/abc/123abc/:param")
testRequest(t, ts.URL+"/get/abc/123abc/xxx", "", "/get/abc/123abc/:param")
testRequest(t, ts.URL+"/get/abc/123abc/abc", "", "/get/abc/123abc/:param")
testRequest(t, ts.URL+"/get/abc/123abc/xxx8xxas", "", "/get/abc/123abc/:param")
testRequest(t, ts.URL+"/get/abc/123abc/xxx8/1234", "", "/get/abc/123abc/xxx8/1234")
testRequest(t, ts.URL+"/get/abc/123abc/xxx8/1", "", "/get/abc/123abc/xxx8/:param")
testRequest(t, ts.URL+"/get/abc/123abc/xxx8/123", "", "/get/abc/123abc/xxx8/:param")
testRequest(t, ts.URL+"/get/abc/123abc/xxx8/78k", "", "/get/abc/123abc/xxx8/:param")
testRequest(t, ts.URL+"/get/abc/123abc/xxx8/1234xxxd", "", "/get/abc/123abc/xxx8/:param")
testRequest(t, ts.URL+"/get/abc/123abc/xxx8/1234/ffas", "", "/get/abc/123abc/xxx8/1234/ffas")
testRequest(t, ts.URL+"/get/abc/123abc/xxx8/1234/f", "", "/get/abc/123abc/xxx8/1234/:param")
testRequest(t, ts.URL+"/get/abc/123abc/xxx8/1234/ffa", "", "/get/abc/123abc/xxx8/1234/:param")
testRequest(t, ts.URL+"/get/abc/123abc/xxx8/1234/kka", "", "/get/abc/123abc/xxx8/1234/:param")
testRequest(t, ts.URL+"/get/abc/123abc/xxx8/1234/ffas321", "", "/get/abc/123abc/xxx8/1234/:param")
testRequest(t, ts.URL+"/get/abc/123abc/xxx8/1234/kkdd/12c", "", "/get/abc/123abc/xxx8/1234/kkdd/12c")
testRequest(t, ts.URL+"/get/abc/123abc/xxx8/1234/kkdd/1", "", "/get/abc/123abc/xxx8/1234/kkdd/:param")
testRequest(t, ts.URL+"/get/abc/123abc/xxx8/1234/kkdd/12", "", "/get/abc/123abc/xxx8/1234/kkdd/:param")
testRequest(t, ts.URL+"/get/abc/123abc/xxx8/1234/kkdd/12b", "", "/get/abc/123abc/xxx8/1234/kkdd/:param")
testRequest(t, ts.URL+"/get/abc/123abc/xxx8/1234/kkdd/34", "", "/get/abc/123abc/xxx8/1234/kkdd/:param")
testRequest(t, ts.URL+"/get/abc/123abc/xxx8/1234/kkdd/12c2e3", "", "/get/abc/123abc/xxx8/1234/kkdd/:param")
testRequest(t, ts.URL+"/get/abc/12/test", "", "/get/abc/:param/test")
testRequest(t, ts.URL+"/get/abc/123abdd/test", "", "/get/abc/:param/test")
testRequest(t, ts.URL+"/get/abc/123abdddf/test", "", "/get/abc/:param/test")
testRequest(t, ts.URL+"/get/abc/123ab/test", "", "/get/abc/:param/test")
testRequest(t, ts.URL+"/get/abc/123abgg/test", "", "/get/abc/:param/test")
testRequest(t, ts.URL+"/get/abc/123abff/test", "", "/get/abc/:param/test")
testRequest(t, ts.URL+"/get/abc/123abffff/test", "", "/get/abc/:param/test")
testRequest(t, ts.URL+"/get/abc/123abd/test", "", "/get/abc/123abd/:param")
testRequest(t, ts.URL+"/get/abc/123abddd/test", "", "/get/abc/123abddd/:param")
testRequest(t, ts.URL+"/get/abc/123/test22", "", "/get/abc/123/:param")
testRequest(t, ts.URL+"/get/abc/123abg/test", "", "/get/abc/123abg/:param")
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+"/a/dd", "404 Not Found")
testRequest(t, ts.URL+"/addr/dd/aa", "404 Not Found")
Expand Down
67 changes: 28 additions & 39 deletions tree.go
View file
Original file line number Diff line number Diff line change
Expand Up @@ -400,23 +400,10 @@ type nodeValue struct {
// 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) {
// path: /abc/123/def
// level 1 router:abc
// level 2 router:123
// level 3 router:def
var (
skippedPath string
latestNode = n // not found `level 2 router` use latestNode

// match '/' count
// matchNum < 1: `level 2 router` not found,the current node needs to be equal to latestNode
// matchNum >= 1: `level (2 or 3 or 4 or ...) router`: Normal handling
matchNum int // each match will accumulate
latestNode = n // Caching the latest node
)
//if path == "/", no need to look for tree node
if len(path) == 1 {
matchNum = 1
}

walk: // Outer loop for walking the tree
for {
Expand Down Expand Up @@ -444,17 +431,13 @@ walk: // Outer loop for walking the tree
}

n = n.children[i]

// match '/', If this condition is matched, the next route is found
if (len(n.fullPath) != 0 && n.wildChild) || path[len(path)-1] == '/' {
matchNum++
}
continue walk
}
}

// level 2 router not found,the current node needs to be equal to latestNode
if matchNum < 1 {
// 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
}

Expand All @@ -472,6 +455,16 @@ walk: // Outer loop for walking the tree

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
for end < len(path) && path[end] != '/' {
Expand Down Expand Up @@ -503,18 +496,6 @@ walk: // Outer loop for walking the tree
if len(n.children) > 0 {
path = path[end:]
n = n.children[0]
// next node,the latestNode needs to be equal to currentNode and handle next router
latestNode = n
// not found router in (level 1 router and handle next node),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
// matchNum: Go to the next level of routing tree node search,need add matchNum
skippedPath = ""
matchNum++
continue walk
}

Expand Down Expand Up @@ -567,8 +548,9 @@ walk: // Outer loop for walking the tree
}

if path == prefix {
// level 2 router not found and latestNode.wildChild is true
if matchNum < 1 && latestNode.wildChild {
// 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]
}
// We should have reached the node containing the handle.
Expand Down Expand Up @@ -600,10 +582,17 @@ walk: // Outer loop for walking the tree
return
}

// path != "/" && skippedPath != ""
if len(path) != 1 && len(skippedPath) > 0 && strings.HasSuffix(skippedPath, path) {
if path != "/" && len(skippedPath) > 0 && strings.HasSuffix(skippedPath, path) {
path = skippedPath
n = latestNode
// 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
}
Expand Down
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