/
cloudflare.go
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/
cloudflare.go
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// SPDX-License-Identifier: Apache-2.0
//
// Copyright 2021 Digital Ocean, Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package provider
import (
"context"
"errors"
"fmt"
"net"
"os"
"github.com/cloudflare/cloudflare-go"
"github.com/digitalocean/flipop/pkg/metacontext"
"github.com/sirupsen/logrus"
)
// Cloudflare is the provider identifier used to identify the Cloudflare provider.
const Cloudflare = "cloudflare"
// CloudflareOption defines a create option for the Cloudflare provider.
type CloudflareOption func(c *cloudflareDNS)
// CloudflareWithLog sets a logrus.FieldLogger on the Cloudflare provider.
func CloudflareWithLog(ll logrus.FieldLogger) CloudflareOption {
return func(c *cloudflareDNS) {
c.log = ll.WithField("provider", Cloudflare)
}
}
func cloudflareWithMetrics(m *metrics) CloudflareOption {
return func(c *cloudflareDNS) {
c.metrics = m.withProvider(Cloudflare)
}
}
type cloudflareDNS struct {
token string
api *cloudflare.API
log logrus.FieldLogger
metrics *metrics
}
// RegisterCloudflare creates the Cloudflare DNS provider and registers it in the registry.
func (r *Registry) RegisterCloudflare(opts ...CloudflareOption) error {
opts = append([]CloudflareOption{
CloudflareWithLog(r.log),
cloudflareWithMetrics(r.metrics),
}, opts...)
cf, err := NewCloudflare(opts...)
if err != nil {
return err
}
r.providers[cf.GetProviderName()] = cf
return nil
}
// NewCloudflare creates a new Cloudflare DNS provider.
func NewCloudflare(opts ...CloudflareOption) (DNSProvider, error) {
c := &cloudflareDNS{
token: os.Getenv("CLOUDFLARE_TOKEN"),
}
for _, o := range opts {
o(c)
}
if c.token == "" {
return nil, errNoCredentials
}
var cfOptions []cloudflare.Option
if baseURL := os.Getenv("CLOUDFLARE_API_URL"); baseURL != "" {
cfOptions = append(cfOptions, cloudflare.BaseURL(baseURL))
}
if userAgent := os.Getenv("CLOUDFLARE_USER_AGENT"); userAgent != "" {
cfOptions = append(cfOptions, cloudflare.UserAgent(userAgent))
} else {
cfOptions = append(cfOptions, cloudflare.UserAgent(defaultUserAgent()))
}
var err error
c.api, err = cloudflare.NewWithAPIToken(c.token, cfOptions...)
return c, err
}
func (c *cloudflareDNS) GetProviderName() string {
return Cloudflare
}
func (c *cloudflareDNS) EnsureDNSARecordSet(ctx context.Context, zone, recordName string, ips []string, ttl int) (err error) {
done := c.metrics.startCall(ctx)
defer done(&err)
var log logrus.FieldLogger = c.log.WithFields(logrus.Fields{"zone": zone, "record_name": recordName})
log = metacontext.AddKubeMetadataToLogger(ctx, log)
var toDelete []string
ipSet := make(map[string]struct{})
for _, ip := range ips {
ipSet[ip] = struct{}{}
}
existing, _, err := c.api.ListDNSRecords(ctx, cloudflare.ZoneIdentifier(zone), cloudflare.ListDNSRecordsParams{
Name: recordName,
Type: dnsRecordTypeA,
})
if err != nil {
return fmt.Errorf("fetching existing cloudflare dns records: %w", err)
}
recordTemplate := cloudflare.CreateDNSRecordParams{
Type: dnsRecordTypeA,
Name: recordName,
TTL: ttl,
}
for _, record := range existing {
_, ok := ipSet[record.Content]
if ok {
if record.TTL != ttl || (record.Proxied != nil && *record.Proxied) {
update := cloudflare.UpdateDNSRecordParams{
ID: record.ID,
Content: record.Content,
Type: recordTemplate.Type,
Name: recordTemplate.Name,
TTL: recordTemplate.TTL,
}
log.WithField("record_id", record.ID).Debug("updating record")
_, err := c.api.UpdateDNSRecord(ctx, cloudflare.ZoneIdentifier(zone), update)
if err != nil {
return c.toRetryError(fmt.Errorf("updating record: %w", err))
}
}
delete(ipSet, record.Content)
} else {
toDelete = append(toDelete, record.ID)
}
}
// Update/Create records for any IPs without records.
for ip := range ipSet {
if len(toDelete) > 0 {
update := cloudflare.UpdateDNSRecordParams{
ID: toDelete[0],
Content: ip,
Type: recordTemplate.Type,
Name: recordTemplate.Name,
TTL: recordTemplate.TTL,
}
log.WithFields(logrus.Fields{"record_id": toDelete[0], "ip": ip}).Debug("updating record target")
_, err := c.api.UpdateDNSRecord(ctx, cloudflare.ZoneIdentifier(zone), update)
if err != nil {
return c.toRetryError(fmt.Errorf("updating record: %w", err))
}
toDelete = toDelete[1:]
} else {
recordTemplate.Content = ip
log.WithField("ip", ip).Debug("creating new record")
_, err := c.api.CreateDNSRecord(ctx, cloudflare.ZoneIdentifier(zone), recordTemplate)
if err != nil {
return c.toRetryError(fmt.Errorf("creating record: %w", err))
}
}
}
// Clear any unneeded records.
for _, id := range toDelete {
log.WithField("record_id", id).Debug("deleting unneeded record")
err := c.api.DeleteDNSRecord(ctx, cloudflare.ZoneIdentifier(zone), id)
if err != nil {
return c.toRetryError(fmt.Errorf("deleting record: %w", err))
}
}
log.Debug("completed updating a record")
return nil
}
// RecordNameAndZoneToFQDN translates a zone+recordName into a fully-qualified domain name.
func (c *cloudflareDNS) RecordNameAndZoneToFQDN(_, recordName string) string {
return recordName
}
func (c *cloudflareDNS) toRetryError(err error) error {
// cloudflare-go manages its own rate-limiting backoff
var nErr net.Error
if errors.As(err, &nErr) {
if nErr.Temporary() {
return NewRetryError(err, RetryFast)
}
}
return err
}