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177 lines
4.0 KiB
177 lines
4.0 KiB
package main
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import (
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"encoding/json"
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"fmt"
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"math"
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"time"
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em "github.com/tendermint/go-event-meter"
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events "github.com/tendermint/go-events"
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tmtypes "github.com/tendermint/tendermint/types"
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wire "github.com/tendermint/go-wire"
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ctypes "github.com/tendermint/tendermint/rpc/core/types"
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)
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const maxRestarts = 25
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type Node struct {
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rpcAddr string
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IsValidator bool `json:"is_validator"` // validator or non-validator?
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// "github.com/tendermint/go-crypto"
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// PubKey crypto.PubKey `json:"pub_key"`
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Name string `json:"name"`
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Online bool `json:"online"`
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Height uint64 `json:"height"`
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BlockLatency float64 `json:"block_latency" wire:"unsafe"` // ms, interval between block commits
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// em holds the ws connection. Each eventMeter callback is called in a separate go-routine.
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em eventMeter
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blockCh chan<- tmtypes.Header
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blockLatencyCh chan<- float64
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disconnectCh chan<- bool
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}
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func NewNode(rpcAddr string) *Node {
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em := em.NewEventMeter(rpcAddr, UnmarshalEvent)
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return NewNodeWithEventMeter(rpcAddr, em)
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}
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func NewNodeWithEventMeter(rpcAddr string, em eventMeter) *Node {
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return &Node{
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rpcAddr: rpcAddr,
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em: em,
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Name: rpcAddr,
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}
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}
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func (n *Node) SendBlocksTo(ch chan<- tmtypes.Header) {
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n.blockCh = ch
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}
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func (n *Node) SendBlockLatenciesTo(ch chan<- float64) {
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n.blockLatencyCh = ch
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}
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func (n *Node) NotifyAboutDisconnects(ch chan<- bool) {
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n.disconnectCh = ch
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}
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func (n *Node) Start() error {
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if _, err := n.em.Start(); err != nil {
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return err
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}
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n.em.RegisterLatencyCallback(latencyCallback(n))
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n.em.Subscribe(tmtypes.EventStringNewBlockHeader(), newBlockCallback(n))
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n.em.RegisterDisconnectCallback(disconnectCallback(n))
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n.Online = true
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return nil
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}
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func (n *Node) Stop() {
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n.Online = false
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n.em.RegisterLatencyCallback(nil)
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n.em.Unsubscribe(tmtypes.EventStringNewBlockHeader())
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n.em.RegisterDisconnectCallback(nil)
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// FIXME stop blocks at event_meter.go:140
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// n.em.Stop()
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}
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// implements eventmeter.EventCallbackFunc
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func newBlockCallback(n *Node) em.EventCallbackFunc {
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return func(metric *em.EventMetric, data events.EventData) {
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block := data.(tmtypes.EventDataNewBlockHeader).Header
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n.Height = uint64(block.Height)
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if n.blockCh != nil {
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n.blockCh <- *block
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}
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}
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}
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// implements eventmeter.EventLatencyFunc
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func latencyCallback(n *Node) em.LatencyCallbackFunc {
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return func(latency float64) {
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n.BlockLatency = latency / 1000000.0 // ns to ms
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if n.blockLatencyCh != nil {
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n.blockLatencyCh <- latency
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}
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}
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}
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// implements eventmeter.DisconnectCallbackFunc
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func disconnectCallback(n *Node) em.DisconnectCallbackFunc {
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return func() {
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n.Online = false
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if n.disconnectCh != nil {
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n.disconnectCh <- true
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}
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if err := n.RestartBackOff(); err != nil {
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log.Error(err.Error())
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} else {
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n.Online = true
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if n.disconnectCh != nil {
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n.disconnectCh <- false
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}
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}
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}
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}
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func (n *Node) RestartBackOff() error {
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attempt := 0
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for {
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d := time.Duration(math.Exp2(float64(attempt)))
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time.Sleep(d * time.Second)
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if err := n.Start(); err != nil {
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log.Debug("Can't connect to node %v due to %v", n, err)
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} else {
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// TODO: authenticate pubkey
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return nil
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}
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attempt++
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if attempt > maxRestarts {
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return fmt.Errorf("Reached max restarts for node %v", n)
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}
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}
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}
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type eventMeter interface {
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Start() (bool, error)
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Stop() bool
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RegisterLatencyCallback(em.LatencyCallbackFunc)
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RegisterDisconnectCallback(em.DisconnectCallbackFunc)
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Subscribe(string, em.EventCallbackFunc) error
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Unsubscribe(string) error
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}
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// Unmarshal a json event
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func UnmarshalEvent(b json.RawMessage) (string, events.EventData, error) {
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var err error
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result := new(ctypes.TMResult)
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wire.ReadJSONPtr(result, b, &err)
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if err != nil {
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return "", nil, err
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}
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event, ok := (*result).(*ctypes.ResultEvent)
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if !ok {
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return "", nil, nil // TODO: handle non-event messages (ie. return from subscribe/unsubscribe)
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// fmt.Errorf("Result is not type *ctypes.ResultEvent. Got %v", reflect.TypeOf(*result))
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}
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return event.Name, event.Data, nil
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}
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