traefik/pkg/provider/label/internal/labels_decode.go

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package internal
import (
"fmt"
"sort"
"strings"
)
// DecodeToNode Converts the labels to a node.
// labels -> nodes
func DecodeToNode(labels map[string]string, filters ...string) (*Node, error) {
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var sortedKeys []string
for key := range labels {
if len(filters) == 0 {
sortedKeys = append(sortedKeys, key)
continue
}
for _, filter := range filters {
if len(key) >= len(filter) && strings.EqualFold(key[:len(filter)], filter) {
sortedKeys = append(sortedKeys, key)
continue
}
}
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}
sort.Strings(sortedKeys)
labelRoot := "traefik"
var node *Node
for i, key := range sortedKeys {
split := strings.Split(key, ".")
if split[0] != labelRoot {
// TODO (@ldez): error or continue
return nil, fmt.Errorf("invalid label root %s", split[0])
}
labelRoot = split[0]
if i == 0 {
node = &Node{}
}
decodeToNode(node, split, labels[key])
}
return node, nil
}
func decodeToNode(root *Node, path []string, value string) {
if len(root.Name) == 0 {
root.Name = path[0]
}
// it's a leaf or not -> children
if len(path) > 1 {
if n := containsNode(root.Children, path[1]); n != nil {
// the child already exists
decodeToNode(n, path[1:], value)
} else {
// new child
child := &Node{Name: path[1]}
decodeToNode(child, path[1:], value)
root.Children = append(root.Children, child)
}
} else {
root.Value = value
}
}
func containsNode(nodes []*Node, name string) *Node {
for _, n := range nodes {
if name == n.Name {
return n
}
}
return nil
}