mirror of
https://github.com/wealdtech/ethdo.git
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77 lines
2.2 KiB
Go
77 lines
2.2 KiB
Go
// Copyright © 2022 Weald Technology Trading.
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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 util
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import (
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"context"
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"errors"
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"fmt"
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"net/http"
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eth2client "github.com/attestantio/go-eth2-client"
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"github.com/attestantio/go-eth2-client/api"
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apiv1 "github.com/attestantio/go-eth2-client/api/v1"
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"github.com/attestantio/go-eth2-client/spec/phase0"
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)
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// BeaconBlockHeaderCache is a cache of beacon block headers.
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type BeaconBlockHeaderCache struct {
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beaconBlockHeadersProvider eth2client.BeaconBlockHeadersProvider
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entries map[phase0.Slot]*beaconBlockHeaderEntry
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}
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// NewBeaconBlockHeaderCache makes a new beacon block header cache.
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func NewBeaconBlockHeaderCache(provider eth2client.BeaconBlockHeadersProvider) *BeaconBlockHeaderCache {
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return &BeaconBlockHeaderCache{
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beaconBlockHeadersProvider: provider,
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entries: make(map[phase0.Slot]*beaconBlockHeaderEntry),
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}
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}
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type beaconBlockHeaderEntry struct {
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present bool
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value *apiv1.BeaconBlockHeader
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}
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// Fetch the beacon block header for the given slot.
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func (b *BeaconBlockHeaderCache) Fetch(ctx context.Context,
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slot phase0.Slot,
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) (
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*apiv1.BeaconBlockHeader,
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error,
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) {
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entry, exists := b.entries[slot]
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if !exists {
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response, err := b.beaconBlockHeadersProvider.BeaconBlockHeader(ctx, &api.BeaconBlockHeaderOpts{Block: fmt.Sprintf("%d", slot)})
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if err != nil {
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var apiErr *api.Error
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if errors.As(err, &apiErr) && apiErr.StatusCode == http.StatusNotFound {
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entry = &beaconBlockHeaderEntry{
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present: false,
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}
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} else {
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return nil, err
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}
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} else {
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entry = &beaconBlockHeaderEntry{
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present: true,
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value: response.Data,
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}
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}
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b.entries[slot] = entry
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}
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return entry.value, nil
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}
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