mirror of https://github.com/certusone/vouch.git
74 lines
2.9 KiB
Go
74 lines
2.9 KiB
Go
// Copyright © 2020 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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"fmt"
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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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)
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// scoreAttestationData generates a score for attestation data.
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// The score is relative to the reward expected by proposing the block.
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func (s *Service) scoreAttestationData(ctx context.Context,
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provider eth2client.AttestationDataProvider,
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name string,
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attestationData *phase0.AttestationData,
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) float64 {
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if attestationData == nil {
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return 0
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}
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var slot phase0.Slot
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if headerProvider, isProvider := provider.(eth2client.BeaconBlockHeadersProvider); isProvider {
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block, err := headerProvider.BeaconBlockHeader(ctx, fmt.Sprintf("%#x", attestationData.BeaconBlockRoot))
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if err != nil {
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log.Error().Err(err).Msg("Failed to obtain block header")
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return float64(attestationData.Source.Epoch + attestationData.Target.Epoch)
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}
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slot = block.Header.Message.Slot
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} else if blockProvider, isProvider := provider.(eth2client.SignedBeaconBlockProvider); isProvider {
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block, err := blockProvider.SignedBeaconBlock(ctx, fmt.Sprintf("%#x", attestationData.BeaconBlockRoot))
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if err != nil {
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log.Error().Err(err).Msg("Failed to obtain block")
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return float64(attestationData.Source.Epoch + attestationData.Target.Epoch)
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}
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if block == nil {
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log.Warn().Str("block_root", fmt.Sprintf("%#x", attestationData.BeaconBlockRoot)).Msg("No block returned by provider")
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return float64(attestationData.Source.Epoch + attestationData.Target.Epoch)
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}
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slot, err = block.Slot()
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if err != nil {
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log.Warn().Str("block_root", fmt.Sprintf("%#x", attestationData.BeaconBlockRoot)).Msg("Empty block returned by provider")
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return float64(attestationData.Source.Epoch + attestationData.Target.Epoch)
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}
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} else {
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log.Warn().Msg("Cannot score attestation")
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return float64(attestationData.Source.Epoch + attestationData.Target.Epoch)
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}
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score := float64(attestationData.Source.Epoch+attestationData.Target.Epoch) + float64(1)/float64(1+attestationData.Slot-slot)
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log.Trace().
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Str("provider", name).
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Uint64("attestation_slot", uint64(attestationData.Slot)).
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Uint64("head_slot", uint64(slot)).
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Uint64("source_epoch", uint64(attestationData.Source.Epoch)).
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Uint64("target_epoch", uint64(attestationData.Target.Epoch)).
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Float64("score", score).
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Msg("Scored attestation data")
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return score
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}
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