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cmd/devp2p: implement AWS Route53 enrtree deployer (#20446)
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,260 @@ | ||
| // Copyright 2019 The go-ethereum Authors | ||
| // This file is part of go-ethereum. | ||
| // | ||
| // go-ethereum is free software: you can redistribute it and/or modify | ||
| // it under the terms of the GNU General Public License as published by | ||
| // the Free Software Foundation, either version 3 of the License, or | ||
| // (at your option) any later version. | ||
| // | ||
| // go-ethereum is distributed in the hope that it will be useful, | ||
| // but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
| // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | ||
| // GNU General Public License for more details. | ||
| // | ||
| // You should have received a copy of the GNU General Public License | ||
| // along with go-ethereum. If not, see <http://www.gnu.org/licenses/>. | ||
|
|
||
| package main | ||
|
|
||
| import ( | ||
| "errors" | ||
| "fmt" | ||
| "strconv" | ||
| "strings" | ||
|
|
||
| "github.com/aws/aws-sdk-go/aws" | ||
| "github.com/aws/aws-sdk-go/aws/credentials" | ||
| "github.com/aws/aws-sdk-go/aws/session" | ||
| "github.com/aws/aws-sdk-go/service/route53" | ||
| "github.com/ethereum/go-ethereum/log" | ||
| "github.com/ethereum/go-ethereum/p2p/dnsdisc" | ||
| "gopkg.in/urfave/cli.v1" | ||
| ) | ||
|
|
||
| var ( | ||
| route53AccessKeyFlag = cli.StringFlag{ | ||
| Name: "access-key-id", | ||
| Usage: "AWS Access Key ID", | ||
| EnvVar: "AWS_ACCESS_KEY_ID", | ||
| } | ||
| route53AccessSecretFlag = cli.StringFlag{ | ||
| Name: "access-key-secret", | ||
| Usage: "AWS Access Key Secret", | ||
| EnvVar: "AWS_SECRET_ACCESS_KEY", | ||
| } | ||
| route53ZoneIDFlag = cli.StringFlag{ | ||
| Name: "zone-id", | ||
| Usage: "Route53 Zone ID", | ||
| } | ||
| ) | ||
|
|
||
| type route53Client struct { | ||
| api *route53.Route53 | ||
| zoneID string | ||
| } | ||
|
|
||
| // newRoute53Client sets up a Route53 API client from command line flags. | ||
| func newRoute53Client(ctx *cli.Context) *route53Client { | ||
| akey := ctx.String(route53AccessKeyFlag.Name) | ||
| asec := ctx.String(route53AccessSecretFlag.Name) | ||
| if akey == "" || asec == "" { | ||
| exit(fmt.Errorf("need Route53 Access Key ID and secret proceed")) | ||
| } | ||
| config := &aws.Config{Credentials: credentials.NewStaticCredentials(akey, asec, "")} | ||
| session, err := session.NewSession(config) | ||
| if err != nil { | ||
| exit(fmt.Errorf("can't create AWS session: %v", err)) | ||
| } | ||
| return &route53Client{ | ||
| api: route53.New(session), | ||
| zoneID: ctx.String(route53ZoneIDFlag.Name), | ||
| } | ||
| } | ||
|
|
||
| // deploy uploads the given tree to Route53. | ||
| func (c *route53Client) deploy(name string, t *dnsdisc.Tree) error { | ||
| if err := c.checkZone(name); err != nil { | ||
| return err | ||
| } | ||
|
|
||
| // Compute DNS changes. | ||
| records := t.ToTXT(name) | ||
| changes, err := c.computeChanges(name, records) | ||
| if err != nil { | ||
| return err | ||
| } | ||
| if len(changes) == 0 { | ||
| log.Info("No DNS changes needed") | ||
| return nil | ||
| } | ||
|
|
||
| // Submit change request. | ||
| log.Info(fmt.Sprintf("Submitting %d changes to Route53", len(changes))) | ||
| batch := new(route53.ChangeBatch) | ||
| batch.SetChanges(changes) | ||
| batch.SetComment(fmt.Sprintf("enrtree update of %s at seq %d", name, t.Seq())) | ||
| req := &route53.ChangeResourceRecordSetsInput{HostedZoneId: &c.zoneID, ChangeBatch: batch} | ||
| resp, err := c.api.ChangeResourceRecordSets(req) | ||
| if err != nil { | ||
| return err | ||
| } | ||
|
|
||
| // Wait for the change to be applied. | ||
| log.Info(fmt.Sprintf("Waiting for change request %s", *resp.ChangeInfo.Id)) | ||
| wreq := &route53.GetChangeInput{Id: resp.ChangeInfo.Id} | ||
| return c.api.WaitUntilResourceRecordSetsChanged(wreq) | ||
| } | ||
|
|
||
| // checkZone verifies zone information for the given domain. | ||
| func (c *route53Client) checkZone(name string) (err error) { | ||
| if c.zoneID == "" { | ||
| c.zoneID, err = c.findZoneID(name) | ||
| } | ||
| return err | ||
| } | ||
|
|
||
| // findZoneID searches for the Zone ID containing the given domain. | ||
| func (c *route53Client) findZoneID(name string) (string, error) { | ||
| log.Info(fmt.Sprintf("Finding Route53 Zone ID for %s", name)) | ||
| var req route53.ListHostedZonesByNameInput | ||
| for { | ||
| resp, err := c.api.ListHostedZonesByName(&req) | ||
| if err != nil { | ||
| return "", err | ||
| } | ||
| for _, zone := range resp.HostedZones { | ||
| if isSubdomain(name, *zone.Name) { | ||
| return *zone.Id, nil | ||
| } | ||
| } | ||
| if !*resp.IsTruncated { | ||
| break | ||
| } | ||
| req.DNSName = resp.NextDNSName | ||
| req.HostedZoneId = resp.NextHostedZoneId | ||
| } | ||
| return "", errors.New("can't find zone ID for " + name) | ||
| } | ||
|
|
||
| // computeChanges creates DNS changes for the given record. | ||
| func (c *route53Client) computeChanges(name string, records map[string]string) ([]*route53.Change, error) { | ||
| // Convert all names to lowercase. | ||
| lrecords := make(map[string]string, len(records)) | ||
| for name, r := range records { | ||
| lrecords[strings.ToLower(name)] = r | ||
| } | ||
| records = lrecords | ||
|
|
||
| // Get existing records. | ||
| existing, err := c.collectRecords(name) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
| log.Info(fmt.Sprintf("Found %d TXT records", len(existing))) | ||
|
|
||
| var changes []*route53.Change | ||
| for path, val := range records { | ||
| ttl := 1 | ||
| if path != name { | ||
| ttl = 2147483647 | ||
| } | ||
|
|
||
| prevRecords, exists := existing[path] | ||
| prevValue := combineTXT(prevRecords) | ||
| if !exists { | ||
| // Entry is unknown, push a new one | ||
| log.Info(fmt.Sprintf("Creating %s = %q", path, val)) | ||
| changes = append(changes, newTXTChange("CREATE", path, ttl, splitTXT(val))) | ||
| } else if prevValue != val { | ||
| // Entry already exists, only change its content. | ||
| log.Info(fmt.Sprintf("Updating %s from %q to %q", path, prevValue, val)) | ||
| changes = append(changes, newTXTChange("UPSERT", path, ttl, splitTXT(val))) | ||
| } else { | ||
| log.Info(fmt.Sprintf("Skipping %s = %q", path, val)) | ||
| } | ||
| } | ||
|
|
||
| // Iterate over the old records and delete anything stale. | ||
| for path, values := range existing { | ||
| if _, ok := records[path]; ok { | ||
| continue | ||
| } | ||
| // Stale entry, nuke it. | ||
| log.Info(fmt.Sprintf("Deleting %s = %q", path, combineTXT(values))) | ||
| changes = append(changes, newTXTChange("DELETE", path, 1, values)) | ||
| } | ||
| return changes, nil | ||
| } | ||
|
|
||
| // collectRecords collects all TXT records below the given name. | ||
| func (c *route53Client) collectRecords(name string) (map[string][]string, error) { | ||
| log.Info(fmt.Sprintf("Retrieving existing TXT records on %s (%s)", name, c.zoneID)) | ||
| var req route53.ListResourceRecordSetsInput | ||
| req.SetHostedZoneId(c.zoneID) | ||
| existing := make(map[string][]string) | ||
| err := c.api.ListResourceRecordSetsPages(&req, func(resp *route53.ListResourceRecordSetsOutput, last bool) bool { | ||
| for _, set := range resp.ResourceRecordSets { | ||
| if !isSubdomain(*set.Name, name) || *set.Type != "TXT" { | ||
| continue | ||
| } | ||
| name := strings.TrimSuffix(*set.Name, ".") | ||
| for _, rec := range set.ResourceRecords { | ||
| existing[name] = append(existing[name], *rec.Value) | ||
| } | ||
| } | ||
| return true | ||
| }) | ||
| return existing, err | ||
| } | ||
|
|
||
| // newTXTChange creates a change to a TXT record. | ||
| func newTXTChange(action, name string, ttl int, values []string) *route53.Change { | ||
| var c route53.Change | ||
| var r route53.ResourceRecordSet | ||
| var rrs []*route53.ResourceRecord | ||
| for _, val := range values { | ||
| rr := new(route53.ResourceRecord) | ||
| rr.SetValue(val) | ||
| rrs = append(rrs, rr) | ||
| } | ||
| r.SetType("TXT") | ||
| r.SetName(name) | ||
| r.SetTTL(int64(ttl)) | ||
| r.SetResourceRecords(rrs) | ||
| c.SetAction(action) | ||
| c.SetResourceRecordSet(&r) | ||
| return &c | ||
| } | ||
|
|
||
| // isSubdomain returns true if name is a subdomain of domain. | ||
| func isSubdomain(name, domain string) bool { | ||
| domain = strings.TrimSuffix(domain, ".") | ||
| name = strings.TrimSuffix(name, ".") | ||
| return strings.HasSuffix("."+name, "."+domain) | ||
| } | ||
|
|
||
| // combineTXT concatenates the given quoted strings into a single unquoted string. | ||
| func combineTXT(values []string) string { | ||
| result := "" | ||
| for _, v := range values { | ||
| if v[0] == '"' { | ||
| v = v[1 : len(v)-1] | ||
| } | ||
| result += v | ||
| } | ||
| return result | ||
| } | ||
|
|
||
| // splitTXT splits value into a list of quoted 255-character strings. | ||
| func splitTXT(value string) []string { | ||
| var result []string | ||
| for len(value) > 0 { | ||
| rlen := len(value) | ||
| if rlen > 253 { | ||
| rlen = 253 | ||
| } | ||
| result = append(result, strconv.Quote(value[:rlen])) | ||
| value = value[rlen:] | ||
| } | ||
| return result | ||
| } |
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