mirror of https://github.com/certusone/vouch.git
98 lines
3.4 KiB
Go
98 lines
3.4 KiB
Go
// Copyright © 2020 Attestant Limited.
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// Licensed )junder 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 first
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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/phase0"
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"github.com/attestantio/vouch/services/metrics"
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"github.com/pkg/errors"
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"github.com/rs/zerolog"
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zerologger "github.com/rs/zerolog/log"
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)
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// Service is the provider for beacon block proposals.
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type Service struct {
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clientMonitor metrics.ClientMonitor
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beaconBlockProposalProviders map[string]eth2client.BeaconBlockProposalProvider
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timeout time.Duration
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}
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// module-wide log.
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var log zerolog.Logger
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// New creates a new beacon block propsal strategy.
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func New(ctx context.Context, params ...Parameter) (*Service, error) {
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parameters, err := parseAndCheckParameters(params...)
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if err != nil {
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return nil, errors.Wrap(err, "problem with parameters")
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}
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// Set logging.
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log = zerologger.With().Str("strategy", "beaconblockproposal").Str("impl", "first").Logger()
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if parameters.logLevel != log.GetLevel() {
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log = log.Level(parameters.logLevel)
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}
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s := &Service{
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beaconBlockProposalProviders: parameters.beaconBlockProposalProviders,
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timeout: parameters.timeout,
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clientMonitor: parameters.clientMonitor,
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}
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return s, nil
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}
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// BeaconBlockProposal provides the first beacon block proposal from a number of beacon nodes.
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func (s *Service) BeaconBlockProposal(ctx context.Context, slot phase0.Slot, randaoReveal phase0.BLSSignature, graffiti []byte) (*phase0.BeaconBlock, error) {
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// We create a cancelable context with a timeout. As soon as the first provider has responded we
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// cancel the context to cancel the other requests.
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ctx, cancel := context.WithTimeout(ctx, s.timeout)
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proposalCh := make(chan *phase0.BeaconBlock, 1)
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for name, provider := range s.beaconBlockProposalProviders {
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go func(ctx context.Context, name string, provider eth2client.BeaconBlockProposalProvider, ch chan *phase0.BeaconBlock) {
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log := log.With().Str("provider", name).Uint64("slot", uint64(slot)).Logger()
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started := time.Now()
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proposal, err := provider.BeaconBlockProposal(ctx, slot, randaoReveal, graffiti)
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s.clientMonitor.ClientOperation(name, "beacon block proposal", err == nil, time.Since(started))
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if err != nil {
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log.Warn().Err(err).Msg("Failed to obtain beacon block proposal")
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return
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}
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if proposal == nil {
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log.Warn().Err(err).Msg("Returned empty beacon block proposal")
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return
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}
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log.Trace().Dur("elapsed", time.Since(started)).Msg("Obtained beacon block proposal")
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ch <- proposal
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}(ctx, name, provider, proposalCh)
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}
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select {
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case <-ctx.Done():
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cancel()
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log.Warn().Msg("Failed to obtain beacon block proposal before timeout")
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return nil, errors.New("failed to obtain beacon block proposal before timeout")
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case proposal := <-proposalCh:
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cancel()
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return proposal, nil
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}
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}
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