156 lines
3.5 KiB
Go
156 lines
3.5 KiB
Go
package models
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import (
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"fmt"
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"strings"
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)
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type Graph struct {
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Version int `json:"version"`
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Batadv struct {
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Directed bool `json:"directed"`
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Graph []string `json:"graph"`
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Nodes []*GraphNode `json:"nodes"`
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Links []*GraphLink `json:"links"`
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} `json:"batadv"`
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}
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type GraphNode struct {
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ID string `json:"id"`
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NodeID string `json:"node_id"`
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}
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type GraphLink struct {
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Source interface{} `json:"source"`
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Target interface{} `json:"target"`
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VPN bool `json:"vpn"`
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TQ float32 `json:"tq"`
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Bidirect bool `json:"bidirect"`
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}
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type GraphBuilder struct {
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macToID map[string]string // mapping from MAC address to node id
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links map[string]*GraphLink // mapping from $idA-$idB to existing link
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vpn map[string]interface{} // IDs/addresses of VPN servers
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}
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func (nodes *Nodes) BuildGraph() *Graph {
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builder := &GraphBuilder{
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macToID: make(map[string]string),
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links: make(map[string]*GraphLink),
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vpn: make(map[string]interface{}),
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}
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builder.readNodes(nodes.List)
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graph := &Graph{Version: 1}
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graph.Batadv.Directed = false
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graph.Batadv.Nodes, graph.Batadv.Links = builder.Extract()
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return graph
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}
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func (builder *GraphBuilder) readNodes(nodes map[string]*Node) {
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// Fill mac->id map
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for sourceID, node := range nodes {
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if nodeinfo := node.Nodeinfo; nodeinfo != nil {
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// is VPN address?
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if nodeinfo.VPN {
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builder.vpn[sourceID] = nil
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}
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for _, batinterface := range nodeinfo.Network.Mesh {
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interfaces := batinterface.Interfaces
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addresses := append(append(interfaces.Other, interfaces.Tunnel...), interfaces.Wireless...)
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for _, sourceAddress := range addresses {
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builder.macToID[sourceAddress] = sourceID
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}
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}
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}
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}
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// Add links
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for sourceID, node := range nodes {
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if neighbours := node.Neighbours; neighbours != nil {
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for _, batadvNeighbours := range neighbours.Batadv {
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for targetAddress, link := range batadvNeighbours.Neighbours {
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if targetID, found := builder.macToID[targetAddress]; found {
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builder.addLink(targetID, sourceID, link.Tq)
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}
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}
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}
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}
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}
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}
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func (builder *GraphBuilder) Extract() ([]*GraphNode, []*GraphLink) {
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iNodes := 0
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iLinks := 0
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links := make([]*GraphLink, len(builder.links))
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nodes := make([]*GraphNode, len(builder.macToID))
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for mac, nodeID := range builder.macToID {
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nodes[iNodes] = &GraphNode{
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ID: mac,
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NodeID: nodeID,
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}
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iNodes++
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}
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for key, link := range builder.links {
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linkPart := strings.Split(key, "-")
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both := 0
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for i, node := range nodes {
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if linkPart[0] == node.NodeID {
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link.Source = i
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both++
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continue
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}
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if linkPart[1] == node.NodeID {
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link.Target = i
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both++
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continue
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}
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}
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if both == 2 {
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links[iLinks] = link
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iLinks++
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}
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}
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return nodes, links[:iLinks]
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}
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func (builder *GraphBuilder) isVPN(ids ...string) bool {
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for _, id := range ids {
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if _, found := builder.vpn[id]; found {
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return true
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}
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}
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return false
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}
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func (builder *GraphBuilder) addLink(targetID string, sourceID string, linkTq int) {
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// Sort IDs to generate the key
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var key string
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if strings.Compare(sourceID, targetID) > 0 {
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key = fmt.Sprintf("%s-%s", sourceID, targetID)
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} else {
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key = fmt.Sprintf("%s-%s", targetID, sourceID)
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}
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var tq float32
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if linkTq > 0 {
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tq = float32(1.0 / (float32(linkTq) / 255.0))
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}
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if link, ok := builder.links[key]; !ok {
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builder.links[key] = &GraphLink{
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VPN: builder.isVPN(sourceID, targetID),
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TQ: tq,
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}
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} else {
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// Use lowest of both link qualities
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if tq < link.TQ {
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link.TQ = tq
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}
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link.Bidirect = true
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}
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}
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