mirror of https://github.com/grpc/grpc-go.git
128 lines
3.4 KiB
Go
128 lines
3.4 KiB
Go
/*
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*
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* Copyright 2021 gRPC authors.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package xdsresource
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import (
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"net/url"
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"sort"
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"strings"
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)
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// FederationScheme is the scheme of a federation resource name.
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const FederationScheme = "xdstp"
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// Name contains the parsed component of an xDS resource name.
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//
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// An xDS resource name is in the format of
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// xdstp://[{authority}]/{resource type}/{id/*}?{context parameters}{#processing directive,*}
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//
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// See
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// https://github.com/cncf/xds/blob/main/proposals/TP1-xds-transport-next.md#uri-based-xds-resource-names
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// for details, and examples.
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type Name struct {
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Scheme string
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Authority string
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Type string
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ID string
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ContextParams map[string]string
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processingDirective string
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}
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// ParseName splits the name and returns a struct representation of the Name.
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//
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// If the name isn't a valid new-style xDS name, field ID is set to the input.
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// Note that this is not an error, because we still support the old-style
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// resource names (those not starting with "xdstp:").
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//
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// The caller can tell if the parsing is successful by checking the returned
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// Scheme.
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func ParseName(name string) *Name {
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if !strings.Contains(name, "://") {
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// Only the long form URL, with ://, is valid.
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return &Name{ID: name}
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}
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parsed, err := url.Parse(name)
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if err != nil {
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return &Name{ID: name}
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}
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ret := &Name{
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Scheme: parsed.Scheme,
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Authority: parsed.Host,
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}
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split := strings.SplitN(parsed.Path, "/", 3)
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if len(split) < 3 {
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// Path is in the format of "/type/id". There must be at least 3
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// segments after splitting.
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return &Name{ID: name}
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}
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ret.Type = split[1]
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ret.ID = split[2]
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if len(parsed.Query()) != 0 {
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ret.ContextParams = make(map[string]string)
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for k, vs := range parsed.Query() {
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if len(vs) > 0 {
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// We only keep one value of each key. Behavior for multiple values
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// is undefined.
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ret.ContextParams[k] = vs[0]
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}
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}
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}
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// TODO: processing directive (the part comes after "#" in the URL, stored
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// in parsed.RawFragment) is kept but not processed. Add support for that
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// when it's needed.
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ret.processingDirective = parsed.RawFragment
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return ret
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}
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// String returns a canonicalized string of name. The context parameters are
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// sorted by the keys.
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func (n *Name) String() string {
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if n.Scheme == "" {
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return n.ID
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}
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// Sort and build query.
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keys := make([]string, 0, len(n.ContextParams))
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for k := range n.ContextParams {
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keys = append(keys, k)
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}
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sort.Strings(keys)
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var pairs []string
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for _, k := range keys {
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pairs = append(pairs, strings.Join([]string{k, n.ContextParams[k]}, "="))
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}
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rawQuery := strings.Join(pairs, "&")
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path := n.Type
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if n.ID != "" {
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path = "/" + path + "/" + n.ID
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}
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tempURL := &url.URL{
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Scheme: n.Scheme,
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Host: n.Authority,
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Path: path,
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RawQuery: rawQuery,
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RawFragment: n.processingDirective,
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}
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return tempURL.String()
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}
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