mirror of https://github.com/certusone/vouch.git
110 lines
4.1 KiB
Go
110 lines
4.1 KiB
Go
// Copyright © 2021 Attestant Limited.
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package best
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import (
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"context"
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"time"
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eth2client "github.com/attestantio/go-eth2-client"
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"github.com/attestantio/go-eth2-client/spec/altair"
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"github.com/attestantio/go-eth2-client/spec/phase0"
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"github.com/attestantio/vouch/util"
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"github.com/pkg/errors"
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)
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type syncCommitteeContributionResponse struct {
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provider string
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contribution *altair.SyncCommitteeContribution
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score float64
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}
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// SyncCommitteeContribution provides the sync committee contribution from a number of beacon nodes.
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func (s *Service) SyncCommitteeContribution(ctx context.Context, slot phase0.Slot, subcommitteeIndex uint64, beaconBlockRoot phase0.Root) (*altair.SyncCommitteeContribution, error) {
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started := time.Now()
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log := util.LogWithID(ctx, log, "strategy_id")
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// We create a cancelable context with a timeout. If the context times out we take the best to date.
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ctx, cancel := context.WithTimeout(ctx, s.timeout)
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respCh := make(chan *syncCommitteeContributionResponse, len(s.syncCommitteeContributionProviders))
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errCh := make(chan error, len(s.syncCommitteeContributionProviders))
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// Kick off the requests.
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for name, provider := range s.syncCommitteeContributionProviders {
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go func(ctx context.Context,
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name string,
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provider eth2client.SyncCommitteeContributionProvider,
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respCh chan *syncCommitteeContributionResponse,
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errCh chan error,
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) {
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contribution, err := provider.SyncCommitteeContribution(ctx, slot, subcommitteeIndex, beaconBlockRoot)
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s.clientMonitor.ClientOperation(name, "sync committee contribution", err == nil, time.Since(started))
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if err != nil {
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errCh <- err
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return
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}
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log.Trace().Str("provider", name).Dur("elapsed", time.Since(started)).Msg("Obtained sync committee contribution")
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if contribution == nil {
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return
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}
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score := s.scoreSyncCommitteeContribution(ctx, name, contribution)
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respCh <- &syncCommitteeContributionResponse{
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provider: name,
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contribution: contribution,
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score: score,
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}
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}(ctx, name, provider, respCh, errCh)
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}
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// Wait for all responses (or context done).
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responded := 0
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errored := 0
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bestScore := float64(0)
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var bestSyncCommitteeContribution *altair.SyncCommitteeContribution
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bestProvider := ""
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for responded+errored != len(s.syncCommitteeContributionProviders) {
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select {
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case <-ctx.Done():
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// Anyone not responded by now is considered errored.
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errored = len(s.syncCommitteeContributionProviders) - responded
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log.Debug().Dur("elapsed", time.Since(started)).Msg("Timed out waiting for responses")
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case err := <-errCh:
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errored++
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log.Warn().Dur("elapsed", time.Since(started)).Err(err).Msg("Error")
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case resp := <-respCh:
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responded++
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if bestSyncCommitteeContribution == nil || resp.score > bestScore {
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bestSyncCommitteeContribution = resp.contribution
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bestScore = resp.score
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bestProvider = resp.provider
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}
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log.Trace().Dur("elapsed", time.Since(started)).Msg("Response")
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}
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}
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log.Trace().Dur("elapsed", time.Since(started)).Int("responded", responded).Int("errored", errored).Str("best_provider", bestProvider).Msg("Complete")
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cancel()
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if bestSyncCommitteeContribution == nil {
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return nil, errors.New("no sync committee contribution received")
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}
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log.Trace().Stringer("sync_committee_contribution", bestSyncCommitteeContribution).Float64("score", bestScore).Msg("Selected best sync committee contribution")
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if bestProvider != "" {
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s.clientMonitor.StrategyOperation("best", bestProvider, "sync committee contribution", time.Since(started))
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}
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return bestSyncCommitteeContribution, nil
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}
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