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.
111 lines
3.4 KiB
Go
111 lines
3.4 KiB
Go
// Copyright © 2020, 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 util
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import (
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"context"
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"fmt"
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"net/url"
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"os"
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"strings"
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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/http"
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"github.com/pkg/errors"
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"github.com/rs/zerolog"
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)
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// defaultBeaconNodeAddresses are default REST endpoint addresses for beacon nodes.
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var defaultBeaconNodeAddresses = []string{
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"localhost:5052", // Lighthouse, Nimbus
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"localhost:5051", // Teku
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"localhost:3500", // Prysm
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}
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// fallbackBeaconNode is used if no other connection is supplied.
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var fallbackBeaconNode = "http://mainnet-consensus.attestant.io/"
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type ConnectOpts struct {
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Address string
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Timeout time.Duration
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AllowInsecure bool
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LogFallback bool
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}
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// ConnectToBeaconNode connects to a beacon node at the given address.
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func ConnectToBeaconNode(ctx context.Context, opts *ConnectOpts) (eth2client.Service, error) {
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if opts == nil {
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return nil, errors.New("no options specified")
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}
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if opts.Timeout == 0 {
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return nil, errors.New("no timeout specified")
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}
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if opts.Address != "" {
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// We have an explicit address; use it.
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return connectToBeaconNode(ctx, opts.Address, opts.Timeout, opts.AllowInsecure)
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}
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// Try the defaults.
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for _, address := range defaultBeaconNodeAddresses {
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client, err := connectToBeaconNode(ctx, address, opts.Timeout, opts.AllowInsecure)
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if err == nil {
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return client, nil
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}
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}
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// The user did not provide a connection, so attempt to use the fallback node.
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if opts.LogFallback {
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fmt.Fprintf(os.Stderr, "No connection supplied with --connection parameter and no local beacon node found, attempting to use mainnet fallback\n")
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}
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client, err := connectToBeaconNode(ctx, fallbackBeaconNode, opts.Timeout, true)
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if err == nil {
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return client, nil
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}
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return nil, errors.New("failed to connect to any beacon node")
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}
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func connectToBeaconNode(ctx context.Context, address string, timeout time.Duration, allowInsecure bool) (eth2client.Service, error) {
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if !strings.HasPrefix(address, "http") {
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address = fmt.Sprintf("http://%s", address)
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}
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if !allowInsecure {
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// Ensure the connection is either secure or local.
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connectionURL, err := url.Parse(address)
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if err != nil {
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return nil, errors.Wrap(err, "failed to parse connection")
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}
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if connectionURL.Scheme == "http" &&
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connectionURL.Host != "localhost" &&
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!strings.HasPrefix(connectionURL.Host, "localhost:") &&
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connectionURL.Host != "127.0.0.1" &&
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!strings.HasPrefix(connectionURL.Host, "127.0.0.1:") {
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fmt.Println("Connections to remote beacon nodes should be secure. This warning can be silenced with --allow-insecure-connections")
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}
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}
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eth2Client, err := http.New(ctx,
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http.WithLogLevel(zerolog.Disabled),
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http.WithAddress(address),
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http.WithTimeout(timeout),
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)
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if err != nil {
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return nil, errors.Wrap(err, "failed to connect to beacon node")
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}
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return eth2Client, nil
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}
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