package models import ( "encoding/json" "io/ioutil" "log" "os" "sync" "time" "github.com/FreifunkBremen/respond-collector/data" "github.com/FreifunkBremen/respond-collector/jsontime" ) // Node struct type Node struct { Firstseen jsontime.Time `json:"firstseen"` Lastseen jsontime.Time `json:"lastseen"` Statistics *data.Statistics `json:"statistics"` Nodeinfo *data.NodeInfo `json:"nodeinfo"` Neighbours *data.Neighbours `json:"-"` } type NodeElement struct { NodeId string } // Nodes struct: cache DB of Node's structs type Nodes struct { Version int `json:"version"` Timestamp jsontime.Time `json:"timestamp"` List map[string]*Node `json:"nodes"` // the current nodemap, indexed by node ID config *Config sync.Mutex } // NewNodes create Nodes structs func NewNodes(config *Config) *Nodes { nodes := &Nodes{ List: make(map[string]*Node), config: config, } if config.Nodes.NodesPath != "" { nodes.load() } go nodes.worker() nodes.Version = 2 return nodes } // Update a Node func (nodes *Nodes) Update(nodeID string, res *data.ResponseData) { now := jsontime.Now() nodes.Lock() node, _ := nodes.List[nodeID] if node == nil { node = &Node{ Firstseen: now, } nodes.List[nodeID] = node } nodes.Unlock() node.Lastseen = now // Update neighbours if val := res.Neighbours; val != nil { node.Neighbours = val } // Update nodeinfo if val := res.NodeInfo; val != nil { node.Nodeinfo = val } // Update statistics if val := res.Statistics; val != nil { node.Statistics = val } } // Periodically saves the cached DB to json file func (nodes *Nodes) worker() { c := time.Tick(time.Second * 5) for range c { log.Println("saving", len(nodes.List), "nodes") nodes.Timestamp = jsontime.Now() nodes.Lock() // serialize nodes save(nodes, nodes.config.Nodes.NodesPath) if path := nodes.config.Nodes.GraphsPath; path != "" { save(nodes.BuildGraph(), path) } nodes.Unlock() } } func (nodes *Nodes) load() { path := nodes.config.Nodes.NodesPath log.Println("loading", path) if data, err := ioutil.ReadFile(path); err == nil { if err := json.Unmarshal(data, nodes); err == nil { log.Println("loaded", len(nodes.List), "nodes") } else { log.Println("failed to unmarshal nodes:", err) } } else { log.Println("failed loading cached nodes:", err) } } func save(input interface{}, outputFile string) { data, err := json.Marshal(input) if err != nil { log.Panic(err) } tmpFile := outputFile + ".tmp" if err := ioutil.WriteFile(tmpFile, data, 0644); err != nil { log.Panic(err) } if err := os.Rename(tmpFile, outputFile); err != nil { log.Panic(err) } }