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beaconstream.go
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beaconstream.go
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package rpc
import (
"context"
"encoding/json"
"fmt"
"net/http"
"net/url"
"strings"
"time"
v1 "github.com/attestantio/go-eth2-client/api/v1"
"github.com/donovanhide/eventsource"
"github.com/ethpandaops/assertoor/pkg/coordinator/clients/consensus/rpc/eventstream"
)
const (
StreamBlockEvent uint16 = 0x01
StreamHeadEvent uint16 = 0x02
StreamFinalizedEvent uint16 = 0x04
)
type BeaconStreamEvent struct {
Event uint16
Data interface{}
}
type BeaconStream struct {
ctx context.Context
ctxCancel context.CancelFunc
running bool
events uint16
client *BeaconClient
ReadyChan chan bool
EventChan chan *BeaconStreamEvent
lastHeadSeen time.Time
}
func (bc *BeaconClient) NewBlockStream(ctx context.Context, events uint16) *BeaconStream {
streamCtx, ctxCancel := context.WithCancel(ctx)
blockStream := BeaconStream{
ctx: streamCtx,
ctxCancel: ctxCancel,
running: true,
events: events,
client: bc,
ReadyChan: make(chan bool, 10),
EventChan: make(chan *BeaconStreamEvent, 10),
}
go blockStream.startStream()
return &blockStream
}
func (bs *BeaconStream) Close() {
bs.ctxCancel()
}
func (bs *BeaconStream) startStream() {
defer func() {
bs.running = false
}()
stream := bs.subscribeStream(bs.client.endpoint, bs.events)
if stream != nil {
defer stream.Close()
for {
select {
case <-bs.ctx.Done():
return
case evt := <-stream.Events:
switch evt.Event() {
case "block":
bs.processBlockEvent(evt)
case "head":
bs.processHeadEvent(evt)
case "finalized_checkpoint":
bs.processFinalizedEvent(evt)
}
case <-stream.Ready:
bs.ReadyChan <- true
case err := <-stream.Errors:
logger.WithField("client", bs.client.name).Warnf("beacon block stream error: %v", err)
select {
case bs.ReadyChan <- false:
case <-bs.ctx.Done():
}
}
}
}
}
func (bs *BeaconStream) subscribeStream(endpoint string, events uint16) *eventstream.Stream {
var topics strings.Builder
topicsCount := 0
if events&StreamBlockEvent > 0 {
if topicsCount > 0 {
fmt.Fprintf(&topics, ",")
}
fmt.Fprintf(&topics, "block")
topicsCount++
}
if events&StreamHeadEvent > 0 {
if topicsCount > 0 {
fmt.Fprintf(&topics, ",")
}
fmt.Fprintf(&topics, "head")
topicsCount++
}
if events&StreamFinalizedEvent > 0 {
if topicsCount > 0 {
fmt.Fprintf(&topics, ",")
}
fmt.Fprintf(&topics, "finalized_checkpoint")
topicsCount++
}
if topicsCount == 0 {
return nil
}
for {
var stream *eventstream.Stream
streamURL := fmt.Sprintf("%s/eth/v1/events?topics=%v", endpoint, topics.String())
req, err := http.NewRequestWithContext(bs.ctx, "GET", streamURL, http.NoBody)
if err == nil {
for headerKey, headerVal := range bs.client.headers {
req.Header.Set(headerKey, headerVal)
}
stream, err = eventstream.SubscribeWithRequest("", req)
}
if err != nil {
logger.WithField("client", bs.client.name).Warnf("Error while subscribing beacon event stream %v: %v", getRedactedURL(streamURL), err)
select {
case <-bs.ctx.Done():
return nil
case <-time.After(10 * time.Second):
}
} else {
return stream
}
}
}
func (bs *BeaconStream) processBlockEvent(evt eventsource.Event) {
var parsed v1.BlockEvent
err := json.Unmarshal([]byte(evt.Data()), &parsed)
if err != nil {
logger.WithField("client", bs.client.name).Warnf("beacon block stream failed to decode block event: %v", err)
return
}
bs.EventChan <- &BeaconStreamEvent{
Event: StreamBlockEvent,
Data: &parsed,
}
}
func (bs *BeaconStream) processHeadEvent(evt eventsource.Event) {
var parsed v1.HeadEvent
err := json.Unmarshal([]byte(evt.Data()), &parsed)
if err != nil {
logger.WithField("client", bs.client.name).Warnf("beacon block stream failed to decode block event: %v", err)
return
}
bs.lastHeadSeen = time.Now()
bs.EventChan <- &BeaconStreamEvent{
Event: StreamHeadEvent,
Data: &parsed,
}
}
func (bs *BeaconStream) processFinalizedEvent(evt eventsource.Event) {
var parsed v1.FinalizedCheckpointEvent
err := json.Unmarshal([]byte(evt.Data()), &parsed)
if err != nil {
logger.WithField("client", bs.client.name).Warnf("beacon block stream failed to decode finalized_checkpoint event: %v", err)
return
}
bs.EventChan <- &BeaconStreamEvent{
Event: StreamFinalizedEvent,
Data: &parsed,
}
}
func getRedactedURL(requrl string) string {
var logurl string
urlData, _ := url.Parse(requrl)
if urlData != nil {
logurl = urlData.Redacted()
} else {
logurl = requrl
}
return logurl
}