mirror of
https://github.com/labstack/echo.git
synced 2024-12-24 20:14:31 +02:00
699 lines
20 KiB
Go
699 lines
20 KiB
Go
package echo
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import (
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"bytes"
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"net/http"
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)
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type (
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// Router is the registry of all registered routes for an `Echo` instance for
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// request matching and URL path parameter parsing.
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Router struct {
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tree *node
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routes map[string]*Route
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echo *Echo
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}
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node struct {
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kind kind
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label byte
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prefix string
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parent *node
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staticChildren children
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originalPath string
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methods *routeMethods
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paramChild *node
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anyChild *node
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paramsCount int
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// isLeaf indicates that node does not have child routes
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isLeaf bool
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// isHandler indicates that node has at least one handler registered to it
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isHandler bool
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// notFoundHandler is handler registered with RouteNotFound method and is executed for 404 cases
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notFoundHandler *routeMethod
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}
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kind uint8
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children []*node
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routeMethod struct {
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ppath string
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pnames []string
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handler HandlerFunc
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}
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routeMethods struct {
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connect *routeMethod
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delete *routeMethod
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get *routeMethod
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head *routeMethod
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options *routeMethod
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patch *routeMethod
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post *routeMethod
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propfind *routeMethod
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put *routeMethod
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trace *routeMethod
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report *routeMethod
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anyOther map[string]*routeMethod
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allowHeader string
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}
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)
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const (
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staticKind kind = iota
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paramKind
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anyKind
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paramLabel = byte(':')
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anyLabel = byte('*')
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)
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func (m *routeMethods) isHandler() bool {
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return m.connect != nil ||
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m.delete != nil ||
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m.get != nil ||
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m.head != nil ||
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m.options != nil ||
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m.patch != nil ||
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m.post != nil ||
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m.propfind != nil ||
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m.put != nil ||
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m.trace != nil ||
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m.report != nil ||
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len(m.anyOther) != 0
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// RouteNotFound/404 is not considered as a handler
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}
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func (m *routeMethods) updateAllowHeader() {
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buf := new(bytes.Buffer)
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buf.WriteString(http.MethodOptions)
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if m.connect != nil {
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buf.WriteString(", ")
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buf.WriteString(http.MethodConnect)
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}
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if m.delete != nil {
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buf.WriteString(", ")
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buf.WriteString(http.MethodDelete)
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}
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if m.get != nil {
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buf.WriteString(", ")
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buf.WriteString(http.MethodGet)
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}
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if m.head != nil {
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buf.WriteString(", ")
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buf.WriteString(http.MethodHead)
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}
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if m.patch != nil {
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buf.WriteString(", ")
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buf.WriteString(http.MethodPatch)
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}
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if m.post != nil {
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buf.WriteString(", ")
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buf.WriteString(http.MethodPost)
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}
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if m.propfind != nil {
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buf.WriteString(", PROPFIND")
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}
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if m.put != nil {
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buf.WriteString(", ")
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buf.WriteString(http.MethodPut)
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}
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if m.trace != nil {
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buf.WriteString(", ")
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buf.WriteString(http.MethodTrace)
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}
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if m.report != nil {
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buf.WriteString(", REPORT")
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}
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for method := range m.anyOther { // for simplicity, we use map and therefore order is not deterministic here
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buf.WriteString(", ")
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buf.WriteString(method)
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}
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m.allowHeader = buf.String()
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}
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// NewRouter returns a new Router instance.
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func NewRouter(e *Echo) *Router {
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return &Router{
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tree: &node{
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methods: new(routeMethods),
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},
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routes: map[string]*Route{},
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echo: e,
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}
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}
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// Add registers a new route for method and path with matching handler.
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func (r *Router) Add(method, path string, h HandlerFunc) {
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// Validate path
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if path == "" {
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path = "/"
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}
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if path[0] != '/' {
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path = "/" + path
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}
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pnames := []string{} // Param names
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ppath := path // Pristine path
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if h == nil && r.echo.Logger != nil {
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// FIXME: in future we should return error
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r.echo.Logger.Errorf("Adding route without handler function: %v:%v", method, path)
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}
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for i, lcpIndex := 0, len(path); i < lcpIndex; i++ {
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if path[i] == ':' {
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if i > 0 && path[i-1] == '\\' {
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path = path[:i-1] + path[i:]
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i--
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lcpIndex--
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continue
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}
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j := i + 1
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r.insert(method, path[:i], staticKind, routeMethod{})
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for ; i < lcpIndex && path[i] != '/'; i++ {
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}
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pnames = append(pnames, path[j:i])
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path = path[:j] + path[i:]
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i, lcpIndex = j, len(path)
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if i == lcpIndex {
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// path node is last fragment of route path. ie. `/users/:id`
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r.insert(method, path[:i], paramKind, routeMethod{ppath, pnames, h})
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} else {
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r.insert(method, path[:i], paramKind, routeMethod{})
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}
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} else if path[i] == '*' {
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r.insert(method, path[:i], staticKind, routeMethod{})
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pnames = append(pnames, "*")
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r.insert(method, path[:i+1], anyKind, routeMethod{ppath, pnames, h})
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}
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}
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r.insert(method, path, staticKind, routeMethod{ppath, pnames, h})
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}
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func (r *Router) insert(method, path string, t kind, rm routeMethod) {
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// Adjust max param
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paramLen := len(rm.pnames)
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if *r.echo.maxParam < paramLen {
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*r.echo.maxParam = paramLen
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}
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currentNode := r.tree // Current node as root
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if currentNode == nil {
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panic("echo: invalid method")
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}
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search := path
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for {
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searchLen := len(search)
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prefixLen := len(currentNode.prefix)
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lcpLen := 0
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// LCP - Longest Common Prefix (https://en.wikipedia.org/wiki/LCP_array)
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max := prefixLen
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if searchLen < max {
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max = searchLen
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}
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for ; lcpLen < max && search[lcpLen] == currentNode.prefix[lcpLen]; lcpLen++ {
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}
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if lcpLen == 0 {
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// At root node
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currentNode.label = search[0]
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currentNode.prefix = search
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if rm.handler != nil {
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currentNode.kind = t
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currentNode.addMethod(method, &rm)
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currentNode.paramsCount = len(rm.pnames)
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currentNode.originalPath = rm.ppath
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}
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currentNode.isLeaf = currentNode.staticChildren == nil && currentNode.paramChild == nil && currentNode.anyChild == nil
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} else if lcpLen < prefixLen {
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// Split node into two before we insert new node.
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// This happens when we are inserting path that is submatch of any existing inserted paths.
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// For example, we have node `/test` and now are about to insert `/te/*`. In that case
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// 1. overlapping part is `/te` that is used as parent node
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// 2. `st` is part from existing node that is not matching - it gets its own node (child to `/te`)
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// 3. `/*` is the new part we are about to insert (child to `/te`)
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n := newNode(
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currentNode.kind,
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currentNode.prefix[lcpLen:],
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currentNode,
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currentNode.staticChildren,
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currentNode.originalPath,
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currentNode.methods,
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currentNode.paramsCount,
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currentNode.paramChild,
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currentNode.anyChild,
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currentNode.notFoundHandler,
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)
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// Update parent path for all children to new node
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for _, child := range currentNode.staticChildren {
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child.parent = n
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}
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if currentNode.paramChild != nil {
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currentNode.paramChild.parent = n
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}
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if currentNode.anyChild != nil {
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currentNode.anyChild.parent = n
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}
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// Reset parent node
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currentNode.kind = staticKind
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currentNode.label = currentNode.prefix[0]
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currentNode.prefix = currentNode.prefix[:lcpLen]
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currentNode.staticChildren = nil
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currentNode.originalPath = ""
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currentNode.methods = new(routeMethods)
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currentNode.paramsCount = 0
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currentNode.paramChild = nil
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currentNode.anyChild = nil
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currentNode.isLeaf = false
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currentNode.isHandler = false
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currentNode.notFoundHandler = nil
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// Only Static children could reach here
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currentNode.addStaticChild(n)
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if lcpLen == searchLen {
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// At parent node
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currentNode.kind = t
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if rm.handler != nil {
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currentNode.addMethod(method, &rm)
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currentNode.paramsCount = len(rm.pnames)
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currentNode.originalPath = rm.ppath
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}
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} else {
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// Create child node
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n = newNode(t, search[lcpLen:], currentNode, nil, "", new(routeMethods), 0, nil, nil, nil)
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if rm.handler != nil {
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n.addMethod(method, &rm)
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n.paramsCount = len(rm.pnames)
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n.originalPath = rm.ppath
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}
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// Only Static children could reach here
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currentNode.addStaticChild(n)
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}
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currentNode.isLeaf = currentNode.staticChildren == nil && currentNode.paramChild == nil && currentNode.anyChild == nil
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} else if lcpLen < searchLen {
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search = search[lcpLen:]
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c := currentNode.findChildWithLabel(search[0])
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if c != nil {
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// Go deeper
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currentNode = c
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continue
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}
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// Create child node
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n := newNode(t, search, currentNode, nil, rm.ppath, new(routeMethods), 0, nil, nil, nil)
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if rm.handler != nil {
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n.addMethod(method, &rm)
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n.paramsCount = len(rm.pnames)
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}
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switch t {
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case staticKind:
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currentNode.addStaticChild(n)
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case paramKind:
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currentNode.paramChild = n
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case anyKind:
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currentNode.anyChild = n
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}
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currentNode.isLeaf = currentNode.staticChildren == nil && currentNode.paramChild == nil && currentNode.anyChild == nil
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} else {
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// Node already exists
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if rm.handler != nil {
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currentNode.addMethod(method, &rm)
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currentNode.paramsCount = len(rm.pnames)
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currentNode.originalPath = rm.ppath
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}
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}
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return
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}
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}
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func newNode(
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t kind,
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pre string,
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p *node,
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sc children,
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originalPath string,
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methods *routeMethods,
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paramsCount int,
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paramChildren,
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anyChildren *node,
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notFoundHandler *routeMethod,
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) *node {
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return &node{
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kind: t,
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label: pre[0],
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prefix: pre,
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parent: p,
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staticChildren: sc,
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originalPath: originalPath,
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methods: methods,
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paramsCount: paramsCount,
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paramChild: paramChildren,
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anyChild: anyChildren,
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isLeaf: sc == nil && paramChildren == nil && anyChildren == nil,
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isHandler: methods.isHandler(),
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notFoundHandler: notFoundHandler,
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}
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}
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func (n *node) addStaticChild(c *node) {
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n.staticChildren = append(n.staticChildren, c)
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}
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func (n *node) findStaticChild(l byte) *node {
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for _, c := range n.staticChildren {
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if c.label == l {
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return c
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}
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}
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return nil
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}
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func (n *node) findChildWithLabel(l byte) *node {
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if c := n.findStaticChild(l); c != nil {
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return c
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}
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if l == paramLabel {
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return n.paramChild
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}
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if l == anyLabel {
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return n.anyChild
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}
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return nil
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}
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func (n *node) addMethod(method string, h *routeMethod) {
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switch method {
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case http.MethodConnect:
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n.methods.connect = h
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case http.MethodDelete:
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n.methods.delete = h
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case http.MethodGet:
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n.methods.get = h
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case http.MethodHead:
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n.methods.head = h
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case http.MethodOptions:
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n.methods.options = h
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case http.MethodPatch:
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n.methods.patch = h
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case http.MethodPost:
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n.methods.post = h
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case PROPFIND:
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n.methods.propfind = h
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case http.MethodPut:
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n.methods.put = h
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case http.MethodTrace:
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n.methods.trace = h
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case REPORT:
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n.methods.report = h
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case RouteNotFound:
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n.notFoundHandler = h
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return // RouteNotFound/404 is not considered as a handler so no further logic needs to be executed
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default:
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if n.methods.anyOther == nil {
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n.methods.anyOther = make(map[string]*routeMethod)
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}
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if h.handler == nil {
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delete(n.methods.anyOther, method)
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} else {
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n.methods.anyOther[method] = h
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}
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}
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n.methods.updateAllowHeader()
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n.isHandler = true
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}
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func (n *node) findMethod(method string) *routeMethod {
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switch method {
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case http.MethodConnect:
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return n.methods.connect
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case http.MethodDelete:
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return n.methods.delete
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case http.MethodGet:
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return n.methods.get
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case http.MethodHead:
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return n.methods.head
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case http.MethodOptions:
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return n.methods.options
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case http.MethodPatch:
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return n.methods.patch
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case http.MethodPost:
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return n.methods.post
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case PROPFIND:
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return n.methods.propfind
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case http.MethodPut:
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return n.methods.put
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case http.MethodTrace:
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return n.methods.trace
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case REPORT:
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return n.methods.report
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default: // RouteNotFound/404 is not considered as a handler
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return n.methods.anyOther[method]
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}
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}
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func optionsMethodHandler(allowMethods string) func(c Context) error {
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return func(c Context) error {
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// Note: we are not handling most of the CORS headers here. CORS is handled by CORS middleware
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// 'OPTIONS' method RFC: https://httpwg.org/specs/rfc7231.html#OPTIONS
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// 'Allow' header RFC: https://datatracker.ietf.org/doc/html/rfc7231#section-7.4.1
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c.Response().Header().Add(HeaderAllow, allowMethods)
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return c.NoContent(http.StatusNoContent)
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}
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}
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// Find lookup a handler registered for method and path. It also parses URL for path
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// parameters and load them into context.
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//
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// For performance:
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//
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// - Get context from `Echo#AcquireContext()`
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// - Reset it `Context#Reset()`
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// - Return it `Echo#ReleaseContext()`.
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func (r *Router) Find(method, path string, c Context) {
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ctx := c.(*context)
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ctx.path = path
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currentNode := r.tree // Current node as root
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var (
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previousBestMatchNode *node
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matchedRouteMethod *routeMethod
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// search stores the remaining path to check for match. By each iteration we move from start of path to end of the path
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// and search value gets shorter and shorter.
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search = path
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searchIndex = 0
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paramIndex int // Param counter
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paramValues = ctx.pvalues // Use the internal slice so the interface can keep the illusion of a dynamic slice
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)
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// Backtracking is needed when a dead end (leaf node) is reached in the router tree.
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// To backtrack the current node will be changed to the parent node and the next kind for the
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// router logic will be returned based on fromKind or kind of the dead end node (static > param > any).
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// For example if there is no static node match we should check parent next sibling by kind (param).
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// Backtracking itself does not check if there is a next sibling, this is done by the router logic.
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backtrackToNextNodeKind := func(fromKind kind) (nextNodeKind kind, valid bool) {
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previous := currentNode
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currentNode = previous.parent
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valid = currentNode != nil
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// Next node type by priority
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if previous.kind == anyKind {
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nextNodeKind = staticKind
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} else {
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nextNodeKind = previous.kind + 1
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}
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if fromKind == staticKind {
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// when backtracking is done from static kind block we did not change search so nothing to restore
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return
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}
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// restore search to value it was before we move to current node we are backtracking from.
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if previous.kind == staticKind {
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searchIndex -= len(previous.prefix)
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} else {
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paramIndex--
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// for param/any node.prefix value is always `:` so we can not deduce searchIndex from that and must use pValue
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// for that index as it would also contain part of path we cut off before moving into node we are backtracking from
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searchIndex -= len(paramValues[paramIndex])
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paramValues[paramIndex] = ""
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}
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search = path[searchIndex:]
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return
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}
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|
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// Router tree is implemented by longest common prefix array (LCP array) https://en.wikipedia.org/wiki/LCP_array
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// Tree search is implemented as for loop where one loop iteration is divided into 3 separate blocks
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// Each of these blocks checks specific kind of node (static/param/any). Order of blocks reflex their priority in routing.
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// Search order/priority is: static > param > any.
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//
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// Note: backtracking in tree is implemented by replacing/switching currentNode to previous node
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// and hoping to (goto statement) next block by priority to check if it is the match.
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for {
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prefixLen := 0 // Prefix length
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lcpLen := 0 // LCP (longest common prefix) length
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|
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if currentNode.kind == staticKind {
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searchLen := len(search)
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prefixLen = len(currentNode.prefix)
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|
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// LCP - Longest Common Prefix (https://en.wikipedia.org/wiki/LCP_array)
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max := prefixLen
|
|
if searchLen < max {
|
|
max = searchLen
|
|
}
|
|
for ; lcpLen < max && search[lcpLen] == currentNode.prefix[lcpLen]; lcpLen++ {
|
|
}
|
|
}
|
|
|
|
if lcpLen != prefixLen {
|
|
// No matching prefix, let's backtrack to the first possible alternative node of the decision path
|
|
nk, ok := backtrackToNextNodeKind(staticKind)
|
|
if !ok {
|
|
return // No other possibilities on the decision path, handler will be whatever context is reset to.
|
|
} else if nk == paramKind {
|
|
goto Param
|
|
// NOTE: this case (backtracking from static node to previous any node) can not happen by current any matching logic. Any node is end of search currently
|
|
//} else if nk == anyKind {
|
|
// goto Any
|
|
} else {
|
|
// Not found (this should never be possible for static node we are looking currently)
|
|
break
|
|
}
|
|
}
|
|
|
|
// The full prefix has matched, remove the prefix from the remaining search
|
|
search = search[lcpLen:]
|
|
searchIndex = searchIndex + lcpLen
|
|
|
|
// Finish routing if is no request path remaining to search
|
|
if search == "" {
|
|
// in case of node that is handler we have exact method type match or something for 405 to use
|
|
if currentNode.isHandler {
|
|
// check if current node has handler registered for http method we are looking for. we store currentNode as
|
|
// best matching in case we do no find no more routes matching this path+method
|
|
if previousBestMatchNode == nil {
|
|
previousBestMatchNode = currentNode
|
|
}
|
|
if h := currentNode.findMethod(method); h != nil {
|
|
matchedRouteMethod = h
|
|
break
|
|
}
|
|
} else if currentNode.notFoundHandler != nil {
|
|
matchedRouteMethod = currentNode.notFoundHandler
|
|
break
|
|
}
|
|
}
|
|
|
|
// Static node
|
|
if search != "" {
|
|
if child := currentNode.findStaticChild(search[0]); child != nil {
|
|
currentNode = child
|
|
continue
|
|
}
|
|
}
|
|
|
|
Param:
|
|
// Param node
|
|
if child := currentNode.paramChild; search != "" && child != nil {
|
|
currentNode = child
|
|
i := 0
|
|
l := len(search)
|
|
if currentNode.isLeaf {
|
|
// when param node does not have any children (path param is last piece of route path) then param node should
|
|
// act similarly to any node - consider all remaining search as match
|
|
i = l
|
|
} else {
|
|
for ; i < l && search[i] != '/'; i++ {
|
|
}
|
|
}
|
|
|
|
paramValues[paramIndex] = search[:i]
|
|
paramIndex++
|
|
search = search[i:]
|
|
searchIndex = searchIndex + i
|
|
continue
|
|
}
|
|
|
|
Any:
|
|
// Any node
|
|
if child := currentNode.anyChild; child != nil {
|
|
// If any node is found, use remaining path for paramValues
|
|
currentNode = child
|
|
paramValues[currentNode.paramsCount-1] = search
|
|
|
|
// update indexes/search in case we need to backtrack when no handler match is found
|
|
paramIndex++
|
|
searchIndex += +len(search)
|
|
search = ""
|
|
|
|
if h := currentNode.findMethod(method); h != nil {
|
|
matchedRouteMethod = h
|
|
break
|
|
}
|
|
// we store currentNode as best matching in case we do not find more routes matching this path+method. Needed for 405
|
|
if previousBestMatchNode == nil {
|
|
previousBestMatchNode = currentNode
|
|
}
|
|
if currentNode.notFoundHandler != nil {
|
|
matchedRouteMethod = currentNode.notFoundHandler
|
|
break
|
|
}
|
|
}
|
|
|
|
// Let's backtrack to the first possible alternative node of the decision path
|
|
nk, ok := backtrackToNextNodeKind(anyKind)
|
|
if !ok {
|
|
break // No other possibilities on the decision path
|
|
} else if nk == paramKind {
|
|
goto Param
|
|
} else if nk == anyKind {
|
|
goto Any
|
|
} else {
|
|
// Not found
|
|
break
|
|
}
|
|
}
|
|
|
|
if currentNode == nil && previousBestMatchNode == nil {
|
|
return // nothing matched at all
|
|
}
|
|
|
|
// matchedHandler could be method+path handler that we matched or notFoundHandler from node with matching path
|
|
// user provided not found (404) handler has priority over generic method not found (405) handler or global 404 handler
|
|
var rPath string
|
|
var rPNames []string
|
|
if matchedRouteMethod != nil {
|
|
rPath = matchedRouteMethod.ppath
|
|
rPNames = matchedRouteMethod.pnames
|
|
ctx.handler = matchedRouteMethod.handler
|
|
} else {
|
|
// use previous match as basis. although we have no matching handler we have path match.
|
|
// so we can send http.StatusMethodNotAllowed (405) instead of http.StatusNotFound (404)
|
|
currentNode = previousBestMatchNode
|
|
|
|
rPath = currentNode.originalPath
|
|
rPNames = nil // no params here
|
|
ctx.handler = NotFoundHandler
|
|
if currentNode.notFoundHandler != nil {
|
|
rPath = currentNode.notFoundHandler.ppath
|
|
rPNames = currentNode.notFoundHandler.pnames
|
|
ctx.handler = currentNode.notFoundHandler.handler
|
|
} else if currentNode.isHandler {
|
|
ctx.Set(ContextKeyHeaderAllow, currentNode.methods.allowHeader)
|
|
ctx.handler = MethodNotAllowedHandler
|
|
if method == http.MethodOptions {
|
|
ctx.handler = optionsMethodHandler(currentNode.methods.allowHeader)
|
|
}
|
|
}
|
|
}
|
|
ctx.path = rPath
|
|
ctx.pnames = rPNames
|
|
}
|