mirror of
https://github.com/wealdtech/ethdo.git
synced 2026-01-09 14:07:56 -05:00
106 lines
3.1 KiB
Go
106 lines
3.1 KiB
Go
// Copyright © 2023 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 validatorexit
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import (
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"context"
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"encoding/json"
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"fmt"
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"os"
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"github.com/pkg/errors"
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"github.com/wealdtech/ethdo/beacon"
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)
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// obtainChainInfo obtains the chain information required to create an exit operation.
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func (c *command) obtainChainInfo(ctx context.Context) error {
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// Use the offline preparation file if present (and we haven't been asked to recreate it).
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if !c.prepareOffline {
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err := c.obtainChainInfoFromFile(ctx)
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if err == nil {
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return nil
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}
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}
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if c.offline {
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return fmt.Errorf("%s is unavailable or outdated; this is required to have been previously generated using --offline-preparation on an online machine and be readable in the directory in which this command is being run", offlinePreparationFilename)
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}
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if err := c.obtainChainInfoFromNode(ctx); err != nil {
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return err
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}
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return nil
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}
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// obtainChainInfoFromFile obtains chain information from a pre-generated file.
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func (c *command) obtainChainInfoFromFile(_ context.Context) error {
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_, err := os.Stat(offlinePreparationFilename)
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if err != nil {
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if c.debug {
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fmt.Fprintf(os.Stderr, "Failed to read offline preparation file: %v\n", err)
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}
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return errors.Wrap(err, fmt.Sprintf("cannot find %s", offlinePreparationFilename))
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}
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if c.debug {
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fmt.Fprintf(os.Stderr, "%s found; loading chain state\n", offlinePreparationFilename)
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}
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data, err := os.ReadFile(offlinePreparationFilename)
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if err != nil {
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if c.debug {
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fmt.Fprintf(os.Stderr, "failed to load chain state: %v\n", err)
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}
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return errors.Wrap(err, "failed to read offline preparation file")
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}
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c.chainInfo = &beacon.ChainInfo{}
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if err := json.Unmarshal(data, c.chainInfo); err != nil {
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if c.debug {
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fmt.Fprintf(os.Stderr, "chain state invalid: %v\n", err)
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}
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return errors.Wrap(err, "failed to parse offline preparation file")
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}
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return nil
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}
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// obtainChainInfoFromNode obtains chain info from a beacon node.
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func (c *command) obtainChainInfoFromNode(ctx context.Context) error {
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if c.debug {
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fmt.Fprintf(os.Stderr, "Populating chain info from beacon node\n")
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}
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var err error
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c.chainInfo, err = beacon.ObtainChainInfoFromNode(ctx, c.consensusClient, c.chainTime)
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if err != nil {
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return err
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}
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return nil
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}
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// writeChainInfoToFile prepares for an offline run of this command by dumping
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// the chain information to a file.
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func (c *command) writeChainInfoToFile(_ context.Context) error {
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data, err := json.Marshal(c.chainInfo)
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if err != nil {
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return err
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}
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if err := os.WriteFile(offlinePreparationFilename, data, 0600); err != nil {
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return err
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}
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return nil
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}
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