486 lines
10 KiB
Go
486 lines
10 KiB
Go
package echo
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import (
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"net/http"
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"strings"
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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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children children
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ppath string
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pnames []string
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methodHandler *methodHandler
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}
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kind uint8
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children []*node
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methodHandler struct {
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connect HandlerFunc
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delete HandlerFunc
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get HandlerFunc
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head HandlerFunc
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options HandlerFunc
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patch HandlerFunc
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post HandlerFunc
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propfind HandlerFunc
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put HandlerFunc
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trace HandlerFunc
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report HandlerFunc
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}
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)
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const (
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skind kind = iota
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pkind
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akind
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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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methodHandler: new(methodHandler),
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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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for i, l := 0, len(path); i < l; i++ {
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if path[i] == ':' {
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j := i + 1
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r.insert(method, path[:i], nil, skind, "", nil)
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for ; i < l && 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, l = j, len(path)
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if i == l {
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r.insert(method, path[:i], h, pkind, ppath, pnames)
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} else {
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r.insert(method, path[:i], nil, pkind, "", nil)
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}
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} else if path[i] == '*' {
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r.insert(method, path[:i], nil, skind, "", nil)
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pnames = append(pnames, "*")
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r.insert(method, path[:i+1], h, akind, ppath, pnames)
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}
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}
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r.insert(method, path, h, skind, ppath, pnames)
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}
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func (r *Router) insert(method, path string, h HandlerFunc, t kind, ppath string, pnames []string) {
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// Adjust max param
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l := len(pnames)
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if *r.echo.maxParam < l {
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*r.echo.maxParam = l
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}
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cn := r.tree // Current node as root
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if cn == 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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sl := len(search)
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pl := len(cn.prefix)
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l := 0
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// LCP
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max := pl
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if sl < max {
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max = sl
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}
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for ; l < max && search[l] == cn.prefix[l]; l++ {
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}
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if l == 0 {
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// At root node
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cn.label = search[0]
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cn.prefix = search
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if h != nil {
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cn.kind = t
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cn.addHandler(method, h)
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cn.ppath = ppath
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cn.pnames = pnames
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}
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} else if l < pl {
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// Split node
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n := newNode(cn.kind, cn.prefix[l:], cn, cn.children, cn.methodHandler, cn.ppath, cn.pnames)
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// Update parent path for all children to new node
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for _, child := range cn.children {
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child.parent = n
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}
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// Reset parent node
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cn.kind = skind
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cn.label = cn.prefix[0]
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cn.prefix = cn.prefix[:l]
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cn.children = nil
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cn.methodHandler = new(methodHandler)
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cn.ppath = ""
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cn.pnames = nil
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cn.addChild(n)
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if l == sl {
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// At parent node
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cn.kind = t
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cn.addHandler(method, h)
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cn.ppath = ppath
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cn.pnames = pnames
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} else {
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// Create child node
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n = newNode(t, search[l:], cn, nil, new(methodHandler), ppath, pnames)
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n.addHandler(method, h)
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cn.addChild(n)
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}
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} else if l < sl {
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search = search[l:]
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c := cn.findChildWithLabel(search[0])
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if c != nil {
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// Go deeper
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cn = 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, cn, nil, new(methodHandler), ppath, pnames)
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n.addHandler(method, h)
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cn.addChild(n)
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} else {
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// Node already exists
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if h != nil {
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cn.addHandler(method, h)
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cn.ppath = ppath
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if len(cn.pnames) == 0 { // Issue #729
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cn.pnames = pnames
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}
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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(t kind, pre string, p *node, c children, mh *methodHandler, ppath string, pnames []string) *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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children: c,
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ppath: ppath,
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pnames: pnames,
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methodHandler: mh,
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}
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}
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func (n *node) addChild(c *node) {
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n.children = append(n.children, c)
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}
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func (n *node) findChild(l byte, t kind) *node {
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for _, c := range n.children {
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if c.label == l && c.kind == t {
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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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for _, c := range n.children {
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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) findChildByKind(t kind) *node {
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for _, c := range n.children {
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if c.kind == t {
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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) addHandler(method string, h HandlerFunc) {
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switch method {
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case http.MethodConnect:
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n.methodHandler.connect = h
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case http.MethodDelete:
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n.methodHandler.delete = h
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case http.MethodGet:
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n.methodHandler.get = h
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case http.MethodHead:
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n.methodHandler.head = h
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case http.MethodOptions:
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n.methodHandler.options = h
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case http.MethodPatch:
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n.methodHandler.patch = h
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case http.MethodPost:
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n.methodHandler.post = h
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case PROPFIND:
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n.methodHandler.propfind = h
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case http.MethodPut:
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n.methodHandler.put = h
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case http.MethodTrace:
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n.methodHandler.trace = h
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case REPORT:
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n.methodHandler.report = h
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}
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}
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func (n *node) findHandler(method string) HandlerFunc {
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switch method {
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case http.MethodConnect:
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return n.methodHandler.connect
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case http.MethodDelete:
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return n.methodHandler.delete
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case http.MethodGet:
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return n.methodHandler.get
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case http.MethodHead:
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return n.methodHandler.head
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case http.MethodOptions:
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return n.methodHandler.options
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case http.MethodPatch:
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return n.methodHandler.patch
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case http.MethodPost:
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return n.methodHandler.post
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case PROPFIND:
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return n.methodHandler.propfind
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case http.MethodPut:
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return n.methodHandler.put
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case http.MethodTrace:
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return n.methodHandler.trace
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case REPORT:
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return n.methodHandler.report
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default:
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return nil
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}
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}
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func (n *node) checkMethodNotAllowed() HandlerFunc {
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for _, m := range methods {
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if h := n.findHandler(m); h != nil {
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return MethodNotAllowedHandler
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}
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}
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return NotFoundHandler
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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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cn := r.tree // Current node as root
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var (
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search = path
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child *node // Child node
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n int // Param counter
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nk kind // Next kind
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nn *node // Next node
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ns string // Next search
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pvalues = 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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// Search order static > param > any
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for {
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if search == "" {
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break
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}
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pl := 0 // Prefix length
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l := 0 // LCP length
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if cn.label != ':' {
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sl := len(search)
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pl = len(cn.prefix)
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// LCP
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max := pl
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if sl < max {
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max = sl
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}
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for ; l < max && search[l] == cn.prefix[l]; l++ {
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}
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}
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if l == pl {
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// Continue search
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search = search[l:]
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// Finish routing if no remaining search and we are on an leaf node
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if search == "" && (nn == nil || cn.parent == nil || cn.ppath != "") {
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break
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}
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}
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// Attempt to go back up the tree on no matching prefix or no remaining search
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if l != pl || search == "" {
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if nn == nil { // Issue #1348
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return // Not found
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}
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cn = nn
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search = ns
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if nk == pkind {
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goto Param
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} else if nk == akind {
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goto Any
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}
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}
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// Static node
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if child = cn.findChild(search[0], skind); child != nil {
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// Save next
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if cn.prefix[len(cn.prefix)-1] == '/' { // Issue #623
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nk = pkind
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nn = cn
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ns = search
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}
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cn = child
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continue
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}
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Param:
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// Param node
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if child = cn.findChildByKind(pkind); child != nil {
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// Issue #378
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if len(pvalues) == n {
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continue
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}
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// Save next
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if cn.prefix[len(cn.prefix)-1] == '/' { // Issue #623
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nk = akind
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nn = cn
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ns = search
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}
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cn = child
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i, l := 0, len(search)
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for ; i < l && search[i] != '/'; i++ {
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}
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pvalues[n] = search[:i]
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n++
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search = search[i:]
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continue
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}
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Any:
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// Any node
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if cn = cn.findChildByKind(akind); cn != nil {
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// If any node is found, use remaining path for pvalues
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pvalues[len(cn.pnames)-1] = search
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break
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}
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// No node found, continue at stored next node
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// or find nearest "any" route
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if nn != nil {
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// No next node to go down in routing (issue #954)
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// Find nearest "any" route going up the routing tree
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search = ns
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np := nn.parent
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// Consider param route one level up only
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if cn = nn.findChildByKind(pkind); cn != nil {
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pos := strings.IndexByte(ns, '/')
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if pos == -1 {
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// If no slash is remaining in search string set param value
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pvalues[len(cn.pnames)-1] = search
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break
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} else if pos > 0 {
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// Otherwise continue route processing with restored next node
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cn = nn
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nn = nil
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ns = ""
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goto Param
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}
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}
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// No param route found, try to resolve nearest any route
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for {
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np = nn.parent
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if cn = nn.findChildByKind(akind); cn != nil {
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break
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}
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if np == nil {
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break // no further parent nodes in tree, abort
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}
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var str strings.Builder
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str.WriteString(nn.prefix)
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str.WriteString(search)
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search = str.String()
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nn = np
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}
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if cn != nil { // use the found "any" route and update path
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pvalues[len(cn.pnames)-1] = search
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break
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}
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}
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return // Not found
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}
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ctx.handler = cn.findHandler(method)
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ctx.path = cn.ppath
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ctx.pnames = cn.pnames
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// NOTE: Slow zone...
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if ctx.handler == nil {
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ctx.handler = cn.checkMethodNotAllowed()
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// Dig further for any, might have an empty value for *, e.g.
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// serving a directory. Issue #207.
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if cn = cn.findChildByKind(akind); cn == nil {
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return
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}
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if h := cn.findHandler(method); h != nil {
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ctx.handler = h
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} else {
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ctx.handler = cn.checkMethodNotAllowed()
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}
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ctx.path = cn.ppath
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ctx.pnames = cn.pnames
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pvalues[len(cn.pnames)-1] = ""
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}
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return
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}
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