mirror of
https://github.com/wealdtech/ethdo.git
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2c01d18195
Update parameter names to meet newer standards. Provide a fallback beacon node if none other supplied.
50 lines
1.4 KiB
Go
50 lines
1.4 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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"strconv"
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"github.com/attestantio/go-eth2-client/spec/phase0"
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"github.com/pkg/errors"
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"github.com/wealdtech/ethdo/services/chaintime"
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)
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// ParseEpoch parses input to calculate the desired epoch.
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func ParseEpoch(_ context.Context, chainTime chaintime.Service, epochStr string) (phase0.Epoch, error) {
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currentEpoch := chainTime.CurrentEpoch()
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switch epochStr {
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case "", "current", "head", "-0":
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return currentEpoch, nil
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case "last":
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if currentEpoch > 0 {
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currentEpoch--
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}
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return currentEpoch, nil
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default:
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val, err := strconv.ParseInt(epochStr, 10, 64)
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if err != nil {
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return 0, errors.Wrap(err, "failed to parse epoch")
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}
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if val >= 0 {
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return phase0.Epoch(val), nil
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}
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if phase0.Epoch(-val) > currentEpoch {
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return 0, nil
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}
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return currentEpoch + phase0.Epoch(val), nil
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}
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}
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