package monitor import ( "encoding/json" "math" "time" "github.com/pkg/errors" crypto "github.com/tendermint/go-crypto" ctypes "github.com/tendermint/tendermint/rpc/core/types" rpc_client "github.com/tendermint/tendermint/rpc/lib/client" tmtypes "github.com/tendermint/tendermint/types" "github.com/tendermint/tmlibs/events" "github.com/tendermint/tmlibs/log" em "github.com/tendermint/tools/tm-monitor/eventmeter" ) const maxRestarts = 25 type Node struct { rpcAddr string IsValidator bool `json:"is_validator"` // validator or non-validator? pubKey crypto.PubKey `json:"pub_key"` Name string `json:"name"` Online bool `json:"online"` Height uint64 `json:"height"` BlockLatency float64 `json:"block_latency" wire:"unsafe"` // ms, interval between block commits // em holds the ws connection. Each eventMeter callback is called in a separate go-routine. em eventMeter // rpcClient is an client for making RPC calls to TM rpcClient rpc_client.HTTPClient blockCh chan<- tmtypes.Header blockLatencyCh chan<- float64 disconnectCh chan<- bool checkIsValidatorInterval time.Duration quit chan struct{} logger log.Logger } func NewNode(rpcAddr string, options ...func(*Node)) *Node { em := em.NewEventMeter(rpcAddr, UnmarshalEvent) rpcClient := rpc_client.NewURIClient(rpcAddr) // HTTP client by default return NewNodeWithEventMeterAndRpcClient(rpcAddr, em, rpcClient, options...) } func NewNodeWithEventMeterAndRpcClient(rpcAddr string, em eventMeter, rpcClient rpc_client.HTTPClient, options ...func(*Node)) *Node { n := &Node{ rpcAddr: rpcAddr, em: em, rpcClient: rpcClient, Name: rpcAddr, quit: make(chan struct{}), checkIsValidatorInterval: 5 * time.Second, logger: log.NewNopLogger(), } for _, option := range options { option(n) } return n } // SetCheckIsValidatorInterval lets you change interval for checking whenever // node is still a validator or not. func SetCheckIsValidatorInterval(d time.Duration) func(n *Node) { return func(n *Node) { n.checkIsValidatorInterval = d } } func (n *Node) SendBlocksTo(ch chan<- tmtypes.Header) { n.blockCh = ch } func (n *Node) SendBlockLatenciesTo(ch chan<- float64) { n.blockLatencyCh = ch } func (n *Node) NotifyAboutDisconnects(ch chan<- bool) { n.disconnectCh = ch } // SetLogger lets you set your own logger func (n *Node) SetLogger(l log.Logger) { n.logger = l n.em.SetLogger(l) } func (n *Node) Start() error { if err := n.em.Start(); err != nil { return err } n.em.RegisterLatencyCallback(latencyCallback(n)) err := n.em.Subscribe(tmtypes.EventStringNewBlockHeader(), newBlockCallback(n)) if err != nil { return err } n.em.RegisterDisconnectCallback(disconnectCallback(n)) n.Online = true n.checkIsValidator() go n.checkIsValidatorLoop() return nil } func (n *Node) Stop() { n.Online = false n.em.Stop() close(n.quit) } // implements eventmeter.EventCallbackFunc func newBlockCallback(n *Node) em.EventCallbackFunc { return func(metric *em.EventMetric, data interface{}) { block := data.(tmtypes.TMEventData).Unwrap().(tmtypes.EventDataNewBlockHeader).Header n.Height = uint64(block.Height) n.logger.Info("new block", "height", block.Height, "numTxs", block.NumTxs) if n.blockCh != nil { n.blockCh <- *block } } } // implements eventmeter.EventLatencyFunc func latencyCallback(n *Node) em.LatencyCallbackFunc { return func(latency float64) { n.BlockLatency = latency / 1000000.0 // ns to ms n.logger.Info("new block latency", "latency", n.BlockLatency) if n.blockLatencyCh != nil { n.blockLatencyCh <- latency } } } // implements eventmeter.DisconnectCallbackFunc func disconnectCallback(n *Node) em.DisconnectCallbackFunc { return func() { n.Online = false n.logger.Info("status", "down") if n.disconnectCh != nil { n.disconnectCh <- true } } } func (n *Node) RestartEventMeterBackoff() error { attempt := 0 for { d := time.Duration(math.Exp2(float64(attempt))) time.Sleep(d * time.Second) if err := n.em.Start(); err != nil { n.logger.Info("restart failed", "err", err) } else { // TODO: authenticate pubkey return nil } attempt++ if attempt > maxRestarts { return errors.New("Reached max restarts") } } } func (n *Node) NumValidators() (height uint64, num int, err error) { height, vals, err := n.validators() if err != nil { return 0, 0, err } return height, len(vals), nil } func (n *Node) validators() (height uint64, validators []*tmtypes.Validator, err error) { vals := new(ctypes.ResultValidators) if _, err = n.rpcClient.Call("validators", nil, vals); err != nil { return 0, make([]*tmtypes.Validator, 0), err } return uint64(vals.BlockHeight), vals.Validators, nil } func (n *Node) checkIsValidatorLoop() { for { select { case <-n.quit: return case <-time.After(n.checkIsValidatorInterval): n.checkIsValidator() } } } func (n *Node) checkIsValidator() { _, validators, err := n.validators() if err == nil { for _, v := range validators { key, err := n.getPubKey() if err == nil && v.PubKey == key { n.IsValidator = true } } } else { n.logger.Info("check is validator failed", "err", err) } } func (n *Node) getPubKey() (crypto.PubKey, error) { if !n.pubKey.Empty() { return n.pubKey, nil } status := new(ctypes.ResultStatus) _, err := n.rpcClient.Call("status", nil, status) if err != nil { return crypto.PubKey{}, err } n.pubKey = status.PubKey return n.pubKey, nil } type eventMeter interface { Start() error Stop() RegisterLatencyCallback(em.LatencyCallbackFunc) RegisterDisconnectCallback(em.DisconnectCallbackFunc) Subscribe(string, em.EventCallbackFunc) error Unsubscribe(string) error SetLogger(l log.Logger) } // UnmarshalEvent unmarshals a json event func UnmarshalEvent(b json.RawMessage) (string, events.EventData, error) { event := new(ctypes.ResultEvent) if err := json.Unmarshal(b, event); err != nil { return "", nil, err } return event.Name, event.Data, nil }