129 lines
3 KiB
Go
129 lines
3 KiB
Go
package kv
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import (
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"fmt"
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"regexp"
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"sort"
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"strings"
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"github.com/kvtools/valkeyrie/store"
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"github.com/traefik/paerser/parser"
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)
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// DecodeToNode converts the labels to a tree of nodes.
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// If any filters are present, labels which do not match the filters are skipped.
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func DecodeToNode(pairs []*store.KVPair, rootName string, filters ...string) (*parser.Node, error) {
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sortedPairs := filterPairs(pairs, filters)
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exp := regexp.MustCompile(`^\d+$`)
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var node *parser.Node
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for i, pair := range sortedPairs {
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if !strings.HasPrefix(pair.Key, rootName+"/") {
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return nil, fmt.Errorf("invalid label root %s", rootName)
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}
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split := strings.FieldsFunc(pair.Key[len(rootName)+1:], func(c rune) bool { return c == '/' })
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parts := []string{rootName}
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for _, fragment := range split {
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if exp.MatchString(fragment) {
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parts = append(parts, "["+fragment+"]")
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} else {
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parts = append(parts, fragment)
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}
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}
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if i == 0 {
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node = &parser.Node{}
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}
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decodeToNode(node, parts, string(pair.Value))
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}
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return node, nil
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}
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func decodeToNode(root *parser.Node, path []string, value string) {
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if len(root.Name) == 0 {
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root.Name = path[0]
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}
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// it's a leaf or not -> children
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if len(path) > 1 {
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if n := containsNode(root.Children, path[1]); n != nil {
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// the child already exists
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decodeToNode(n, path[1:], value)
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} else {
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// new child
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child := &parser.Node{Name: path[1]}
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decodeToNode(child, path[1:], value)
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root.Children = append(root.Children, child)
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}
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} else {
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root.Value = value
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}
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}
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func containsNode(nodes []*parser.Node, name string) *parser.Node {
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for _, n := range nodes {
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if strings.EqualFold(name, n.Name) {
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return n
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}
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}
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return nil
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}
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func filterPairs(pairs []*store.KVPair, filters []string) []*store.KVPair {
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exp := regexp.MustCompile(`^(.+)/\d+$`)
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sort.Slice(pairs, func(i, j int) bool {
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return pairs[i].Key < pairs[j].Key
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})
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simplePairs := map[string]*store.KVPair{}
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slicePairs := map[string][]string{}
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for _, pair := range pairs {
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if len(filters) == 0 {
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// Slice of simple type
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if exp.MatchString(pair.Key) {
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sanitizedKey := exp.FindStringSubmatch(pair.Key)[1]
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slicePairs[sanitizedKey] = append(slicePairs[sanitizedKey], string(pair.Value))
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} else {
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simplePairs[pair.Key] = pair
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}
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continue
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}
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for _, filter := range filters {
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if len(pair.Key) >= len(filter) && strings.EqualFold(pair.Key[:len(filter)], filter) {
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// Slice of simple type
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if exp.MatchString(pair.Key) {
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sanitizedKey := exp.FindStringSubmatch(pair.Key)[1]
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slicePairs[sanitizedKey] = append(slicePairs[sanitizedKey], string(pair.Value))
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} else {
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simplePairs[pair.Key] = pair
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}
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continue
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}
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}
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}
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var sortedPairs []*store.KVPair
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for k, v := range slicePairs {
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delete(simplePairs, k)
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sortedPairs = append(sortedPairs, &store.KVPair{Key: k, Value: []byte(strings.Join(v, ","))})
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}
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for _, v := range simplePairs {
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sortedPairs = append(sortedPairs, v)
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}
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sort.Slice(sortedPairs, func(i, j int) bool {
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return sortedPairs[i].Key < sortedPairs[j].Key
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})
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return sortedPairs
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}
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