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225 lines
5.0 KiB
225 lines
5.0 KiB
package main
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import (
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"bytes"
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"encoding/json"
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"fmt"
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"os"
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"reflect"
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"sync"
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"time"
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. "github.com/tendermint/go-common"
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"github.com/tendermint/go-crypto"
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// register rpc and event types with go-
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ctypes "github.com/tendermint/tendermint/rpc/core/types"
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// "github.com/tendermint/tendermint/types"
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client "github.com/tendermint/tendermint/rpc/client"
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"github.com/gorilla/websocket"
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"github.com/rcrowley/go-metrics"
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)
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//------------------------------------------------------
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// Connect to all validators for a blockchain
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type Blockchain struct {
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ID string
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Validators []Validator
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}
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type Validator struct {
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ID string
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PubKey crypto.PubKey
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IP string
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Port int
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}
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//------------------------------------------------------
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// Generic system to subscribe to events and record their frequency
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// Metrics for a given event
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type EventMetric struct {
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ID string `json:"id"`
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Started time.Time `json:"start_time"`
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LastHeard time.Time `json:"last_heard"`
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MinDuration int64 `json:"min_duration"`
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MaxDuration int64 `json:"max_duration"`
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// tracks event count and rate
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meter metrics.Meter
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// filled in from the Meter
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Count int64 `json:"count"`
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Rate1 float64 `json:"rate_1"`
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Rate5 float64 `json:"rate_5"`
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Rate15 float64 `json:"rate_15"`
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RateMean float64 `json:"rate_mean"`
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// XXX: move this
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// latency for node itself (not related to event)
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Latency float64 `json:"latency_mean"`
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}
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// Each node gets an event meter to track events for that node
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type EventMeter struct {
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QuitService
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wsc *client.WSClient
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mtx sync.Mutex
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events map[string]*EventMetric
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// to record latency
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timer metrics.Timer
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lastPing time.Time
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receivedPong bool
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}
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func NewEventMeter(addr string) *EventMeter {
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em := &EventMeter{
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wsc: client.NewWSClient(addr),
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events: make(map[string]*EventMetric),
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timer: metrics.NewTimer(),
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receivedPong: true,
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}
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em.QuitService = *NewQuitService(nil, "EventMeter", em)
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return em
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}
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func (em *EventMeter) OnStart() error {
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em.QuitService.OnStart()
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if err := em.wsc.OnStart(); err != nil {
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return err
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}
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em.wsc.Conn.SetPongHandler(func(m string) error {
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// NOTE: https://github.com/gorilla/websocket/issues/97
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em.mtx.Lock()
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defer em.mtx.Unlock()
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em.receivedPong = true
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em.timer.UpdateSince(em.lastPing)
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return nil
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})
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go em.receiveRoutine()
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return nil
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}
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func (em *EventMeter) OnStop() {
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em.wsc.OnStop()
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em.QuitService.OnStop()
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}
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func (em *EventMeter) Subscribe(eventid string) error {
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em.mtx.Lock()
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defer em.mtx.Unlock()
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if _, ok := em.events[eventid]; ok {
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return fmt.Errorf("Subscription already exists")
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}
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if err := em.wsc.Subscribe(eventid); err != nil {
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return err
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}
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em.events[eventid] = &EventMetric{
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Started: time.Now(),
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MinDuration: 1 << 62,
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meter: metrics.NewMeter(),
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}
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return nil
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}
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func (em *EventMeter) Unsubscribe(eventid string) error {
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em.mtx.Lock()
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defer em.mtx.Unlock()
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if err := em.wsc.Unsubscribe(eventid); err != nil {
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return err
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}
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// XXX: should we persist or save this info first?
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delete(em.events, eventid)
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return nil
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}
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//------------------------------------------------------
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func (em *EventMeter) receiveRoutine() {
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logTicker := time.NewTicker(time.Second * 3)
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pingTicker := time.NewTicker(time.Second * 1)
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for {
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select {
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case <-logTicker.C:
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em.mtx.Lock()
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for _, metric := range em.events {
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metric.Count = metric.meter.Count()
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metric.Rate1 = metric.meter.Rate1()
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metric.Rate5 = metric.meter.Rate5()
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metric.Rate15 = metric.meter.Rate15()
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metric.RateMean = metric.meter.RateMean()
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metric.Latency = em.timer.Mean()
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b, err := json.Marshal(metric)
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if err != nil {
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// TODO
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log.Error(err.Error())
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continue
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}
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var out bytes.Buffer
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json.Indent(&out, b, "", "\t")
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out.WriteTo(os.Stdout)
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}
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em.mtx.Unlock()
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case <-pingTicker.C:
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em.mtx.Lock()
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// ping to record latency
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if !em.receivedPong {
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// XXX: why is the pong taking so long? should we stop the conn?
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em.mtx.Unlock()
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continue
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}
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em.lastPing = time.Now()
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em.receivedPong = false
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err := em.wsc.Conn.WriteMessage(websocket.PingMessage, []byte{})
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if err != nil {
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log.Error("Failed to write ping message on websocket", "error", err)
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em.wsc.Stop()
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return
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}
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em.mtx.Unlock()
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case r := <-em.wsc.ResultsCh:
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em.mtx.Lock()
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switch r := r.(type) {
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case *ctypes.ResultEvent:
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id, _ := r.Event, r.Data
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metric, ok := em.events[id]
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if !ok {
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// we already unsubscribed, or got an unexpected event
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continue
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}
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last := metric.LastHeard
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metric.LastHeard = time.Now()
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metric.meter.Mark(1)
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dur := int64(metric.LastHeard.Sub(last))
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if dur < metric.MinDuration {
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metric.MinDuration = dur
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}
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if !last.IsZero() && dur > metric.MaxDuration {
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metric.MaxDuration = dur
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}
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default:
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log.Error("Unknown result event type", "type", reflect.TypeOf(r))
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}
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em.mtx.Unlock()
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case <-em.Quit:
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break
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}
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}
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}
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