94 lines
3.1 KiB
Go
94 lines
3.1 KiB
Go
// VulcanizeDB
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// Copyright © 2022 Vulcanize
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// This program is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Affero General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Affero General Public License for more details.
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// You should have received a copy of the GNU Affero General Public License
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// along with this program. If not, see <http://www.gnu.org/licenses/>.
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// This package will handle all event subscriptions that utilize SSE.
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package beaconclient
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import (
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"context"
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"encoding/json"
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"time"
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log "github.com/sirupsen/logrus"
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"github.com/vulcanize/ipld-eth-beacon-indexer/pkg/loghelper"
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)
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// This function will capture all the SSE events for a given SseEvents object.
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// When new messages come in, it will ensure that they are decoded into JSON.
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// If any errors occur, it log the error information.
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func handleIncomingSseEvent[P ProcessedEvents](ctx context.Context, eventHandler *SseEvents[P], errMetricInc func(uint64), skipSse bool) {
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if !skipSse {
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for {
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err := eventHandler.SseClient.SubscribeChanRawWithContext(ctx, eventHandler.MessagesCh)
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if err != nil {
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loghelper.LogEndpoint(eventHandler.Endpoint).WithFields(log.Fields{
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"err": err}).Error("We are unable to subscribe to the SSE endpoint")
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time.Sleep(3 * time.Second)
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continue
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}
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loghelper.LogEndpoint(eventHandler.Endpoint).Info("Successfully subscribed to the event stream.")
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break
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}
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}
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for {
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select {
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case <-ctx.Done():
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close(eventHandler.MessagesCh)
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close(eventHandler.ErrorCh)
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return
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case message := <-eventHandler.MessagesCh:
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// Message can be nil if its a keep-alive message
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if len(message.Data) != 0 {
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log.WithFields(log.Fields{"msg": string(message.Data)}).Debug("We are going to send the following message to be processed.")
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go processMsg(message.Data, eventHandler.ProcessCh, eventHandler.ErrorCh)
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}
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case headErr := <-eventHandler.ErrorCh:
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log.WithFields(log.Fields{
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"endpoint": eventHandler.Endpoint,
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"err": headErr.err,
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"msg": headErr.msg,
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},
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).Error("Unable to handle event.")
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errMetricInc(1)
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}
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}
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}
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// Turn the data object into a Struct.
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func processMsg[P ProcessedEvents](msg []byte, processCh chan<- P, errorCh chan<- SseError) {
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var msgMarshaled P
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err := json.Unmarshal(msg, &msgMarshaled)
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if err != nil {
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loghelper.LogError(err).Error("Unable to parse message")
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errorCh <- SseError{
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err: err,
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msg: msg,
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}
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return
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}
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processCh <- msgMarshaled
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log.Debug("Done sending")
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}
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// Capture all of the event topics.
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func (bc *BeaconClient) captureEventTopic(ctx context.Context, skipSse bool) {
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log.Info("We are capturing all SSE events")
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go handleIncomingSseEvent(ctx, bc.HeadTracking, bc.Metrics.IncrementHeadError, skipSse)
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go handleIncomingSseEvent(ctx, bc.ReOrgTracking, bc.Metrics.IncrementReorgError, skipSse)
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}
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