package runtime import ( "encoding/json" "log" "os" "sync" "time" "github.com/FreifunkBremen/yanic/data" "github.com/FreifunkBremen/yanic/jsontime" ) // Nodes struct: cache DB of Node's structs type Nodes struct { List map[string]*Node `json:"nodes"` // the current nodemap, indexed by node ID ifaceToNodeID map[string]string // mapping from MAC address to NodeID config *Config sync.RWMutex } // NewNodes create Nodes structs func NewNodes(config *Config) *Nodes { nodes := &Nodes{ List: make(map[string]*Node), ifaceToNodeID: make(map[string]string), config: config, } if config.Nodes.StatePath != "" { nodes.load() } return nodes } // Start all services to manage Nodes func (nodes *Nodes) Start() { go nodes.worker() } // Update a Node func (nodes *Nodes) Update(nodeID string, res *data.ResponseData) *Node { now := jsontime.Now() nodes.Lock() node, _ := nodes.List[nodeID] if node == nil { node = &Node{ Firstseen: now, } nodes.List[nodeID] = node } nodes.Unlock() // Update wireless statistics if statistics := res.Statistics; statistics != nil { // Update channel utilization if previous statistics are present if node.Statistics != nil && node.Statistics.Wireless != nil && statistics.Wireless != nil { statistics.Wireless.SetUtilization(node.Statistics.Wireless) } } // Update fields node.Lastseen = now node.Online = true node.Neighbours = res.Neighbours node.Nodeinfo = res.NodeInfo node.Statistics = res.Statistics if node.Nodeinfo != nil { nodes.readIfaces(node.Nodeinfo) } return node } // Select selects a list of nodes to be returned func (nodes *Nodes) Select(f func(*Node) bool) []*Node { nodes.RLock() defer nodes.RUnlock() result := make([]*Node, 0, len(nodes.List)) for _, node := range nodes.List { if f(node) { result = append(result, node) } } return result } // NodeLinks returns a list of links to known neighbours func (nodes *Nodes) NodeLinks(node *Node) (result []Link) { // Store link data neighbours := node.Neighbours if neighbours == nil || neighbours.NodeID == "" { return } nodes.RLock() defer nodes.RUnlock() for sourceMAC, batadv := range neighbours.Batadv { for neighbourMAC, link := range batadv.Neighbours { if neighbourID := nodes.ifaceToNodeID[neighbourMAC]; neighbourID != "" { result = append(result, Link{ SourceID: neighbours.NodeID, SourceMAC: sourceMAC, TargetID: neighbourID, TargetMAC: neighbourMAC, TQ: link.Tq, }) } } } return result } // Periodically saves the cached DB to json file func (nodes *Nodes) worker() { c := time.Tick(nodes.config.Nodes.SaveInterval.Duration) for range c { nodes.expire() nodes.save() } } // Expires nodes and set nodes offline func (nodes *Nodes) expire() { now := jsontime.Now() // Nodes last seen before expireAfter will be removed prunePeriod := nodes.config.Nodes.PruneAfter.Duration if prunePeriod == 0 { prunePeriod = time.Hour * 24 * 7 // our default } pruneAfter := now.Add(-prunePeriod) // Nodes last seen within OfflineAfter are changed to 'offline' offlineAfter := now.Add(-nodes.config.Nodes.OfflineAfter.Duration) // Locking foo nodes.Lock() defer nodes.Unlock() for id, node := range nodes.List { if node.Lastseen.Before(pruneAfter) { // expire delete(nodes.List, id) } else if node.Lastseen.Before(offlineAfter) { // set to offline node.Online = false } } } // adds the nodes interface addresses to the internal map func (nodes *Nodes) readIfaces(nodeinfo *data.NodeInfo) { nodeID := nodeinfo.NodeID network := nodeinfo.Network if nodeID == "" { log.Println("nodeID missing in nodeinfo") return } nodes.Lock() defer nodes.Unlock() addresses := []string{network.Mac} for _, batinterface := range network.Mesh { addresses = append(addresses, batinterface.Addresses()...) } for _, mac := range addresses { if oldNodeID, _ := nodes.ifaceToNodeID[mac]; oldNodeID != nodeID { if oldNodeID != "" { log.Printf("override nodeID from %s to %s on MAC address %s", oldNodeID, nodeID, mac) } nodes.ifaceToNodeID[mac] = nodeID } } } func (nodes *Nodes) load() { path := nodes.config.Nodes.StatePath if f, err := os.Open(path); err == nil { // transform data to legacy meshviewer if err = json.NewDecoder(f).Decode(nodes); err == nil { log.Println("loaded", len(nodes.List), "nodes") for _, node := range nodes.List { if node.Nodeinfo != nil { nodes.readIfaces(node.Nodeinfo) } } } else { log.Println("failed to unmarshal nodes:", err) } } else { log.Println("failed to load cached nodes:", err) } } func (nodes *Nodes) save() { // Locking foo nodes.RLock() defer nodes.RUnlock() // serialize nodes SaveJSON(nodes, nodes.config.Nodes.StatePath) } // SaveJSON to path func SaveJSON(input interface{}, outputFile string) { tmpFile := outputFile + ".tmp" f, err := os.OpenFile(tmpFile, os.O_WRONLY|os.O_CREATE|os.O_TRUNC, 0644) if err != nil { log.Panic(err) } err = json.NewEncoder(f).Encode(input) if err != nil { log.Panic(err) } f.Close() if err := os.Rename(tmpFile, outputFile); err != nil { log.Panic(err) } }