clash/config/utils.go

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package config
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import (
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"fmt"
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"strings"
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"github.com/Dreamacro/clash/adapter/outboundgroup"
"github.com/Dreamacro/clash/common/structure"
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)
func trimArr(arr []string) (r []string) {
for _, e := range arr {
r = append(r, strings.Trim(e, " "))
}
return
}
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// Check if ProxyGroups form DAG(Directed Acyclic Graph), and sort all ProxyGroups by dependency order.
// Meanwhile, record the original index in the config file.
// If loop is detected, return an error with location of loop.
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func proxyGroupsDagSort(groupsConfig []map[string]interface{}) error {
type graphNode struct {
indegree int
// topological order
topo int
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// the original data in `groupsConfig`
data map[string]interface{}
// `outdegree` and `from` are used in loop locating
outdegree int
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option *outboundgroup.GroupCommonOption
from []string
}
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decoder := structure.NewDecoder(structure.Option{TagName: "group", WeaklyTypedInput: true})
graph := make(map[string]*graphNode)
// Step 1.1 build dependency graph
for _, mapping := range groupsConfig {
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option := &outboundgroup.GroupCommonOption{}
if err := decoder.Decode(mapping, option); err != nil {
return fmt.Errorf("ProxyGroup %s: %s", option.Name, err.Error())
}
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groupName := option.Name
if node, ok := graph[groupName]; ok {
if node.data != nil {
return fmt.Errorf("ProxyGroup %s: duplicate group name", groupName)
}
node.data = mapping
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node.option = option
} else {
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graph[groupName] = &graphNode{0, -1, mapping, 0, option, nil}
}
for _, proxy := range option.Proxies {
if node, ex := graph[proxy]; ex {
node.indegree++
} else {
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graph[proxy] = &graphNode{1, -1, nil, 0, nil, nil}
}
}
}
// Step 1.2 Topological Sort
// topological index of **ProxyGroup**
index := 0
queue := make([]string, 0)
for name, node := range graph {
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// in the beginning, put nodes that have `node.indegree == 0` into queue.
if node.indegree == 0 {
queue = append(queue, name)
}
}
// every element in queue have indegree == 0
for ; len(queue) > 0; queue = queue[1:] {
name := queue[0]
node := graph[name]
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if node.option != nil {
index++
groupsConfig[len(groupsConfig)-index] = node.data
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if len(node.option.Proxies) == 0 {
delete(graph, name)
continue
}
for _, proxy := range node.option.Proxies {
child := graph[proxy]
child.indegree--
if child.indegree == 0 {
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queue = append(queue, proxy)
}
}
}
delete(graph, name)
}
// no loop is detected, return sorted ProxyGroup
if len(graph) == 0 {
return nil
}
// if loop is detected, locate the loop and throw an error
// Step 2.1 rebuild the graph, fill `outdegree` and `from` filed
for name, node := range graph {
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if node.option == nil {
continue
}
if len(node.option.Proxies) == 0 {
continue
}
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for _, proxy := range node.option.Proxies {
node.outdegree++
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child := graph[proxy]
if child.from == nil {
child.from = make([]string, 0, child.indegree)
}
child.from = append(child.from, name)
}
}
// Step 2.2 remove nodes outside the loop. so that we have only the loops remain in `graph`
queue = make([]string, 0)
// initialize queue with node have outdegree == 0
for name, node := range graph {
if node.outdegree == 0 {
queue = append(queue, name)
}
}
// every element in queue have outdegree == 0
for ; len(queue) > 0; queue = queue[1:] {
name := queue[0]
node := graph[name]
for _, f := range node.from {
graph[f].outdegree--
if graph[f].outdegree == 0 {
queue = append(queue, f)
}
}
delete(graph, name)
}
// Step 2.3 report the elements in loop
loopElements := make([]string, 0, len(graph))
for name := range graph {
loopElements = append(loopElements, name)
delete(graph, name)
}
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return fmt.Errorf("loop is detected in ProxyGroup, please check following ProxyGroups: %v", loopElements)
}