4d1351c52a
Update use of the google API to current practices The reduction in requests is achieved by adding a limiter and returning a cached response if the limiter will not allow a request.
146 lines
3.3 KiB
Go
146 lines
3.3 KiB
Go
// Copyright 2017 Google LLC
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//
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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 gcp
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import (
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"context"
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"fmt"
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"sync"
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"time"
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"golang.org/x/time/rate"
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dns "google.golang.org/api/dns/v1"
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"github.com/lordwelch/cloud-dyndns-client/pkg/backend"
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)
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type cloudDNSRecord struct {
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dns.ResourceRecordSet
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}
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func (c cloudDNSRecord) Name() string {
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return c.ResourceRecordSet.Name
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}
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func (c cloudDNSRecord) Type() string {
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return c.ResourceRecordSet.Type
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}
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func (c cloudDNSRecord) Ttl() int64 {
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return c.ResourceRecordSet.Ttl
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}
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func (c cloudDNSRecord) Data() []string {
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return c.ResourceRecordSet.Rrdatas
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}
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// TODO: New backend
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type cloudDNSBackend struct {
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client *dns.Service
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project string
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zone string
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timeout time.Duration
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limiter *rate.Limiter
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cache map[string]cloudDNSRecord
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mutex *sync.RWMutex
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}
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func NewCloudDNSBackend(project, zone string) (backend.DNSBackend, error) {
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client, err := dns.NewService(context.Background())
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if err != nil {
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return nil, fmt.Errorf("Could not create Google Cloud DNS client: %v", err)
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}
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return &cloudDNSBackend{
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client: client,
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project: project,
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zone: zone,
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timeout: 5 * time.Second,
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limiter: rate.NewLimiter(rate.Every(5*time.Second), 1),
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cache: make(map[string]cloudDNSRecord),
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mutex: &sync.RWMutex{},
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}, nil
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}
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func (b *cloudDNSBackend) GetRecord(ctx context.Context, dnsName, dnsType string) (backend.DNSRecord, error) {
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var record *dns.ResourceRecordSet
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if !b.limiter.Allow() {
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b.mutex.RLock()
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record := b.cache[dnsName+"-"+dnsType]
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b.mutex.RUnlock()
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return record, nil
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}
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fmt.Println("run GetRecord")
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b.mutex.Lock()
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b.cache = make(map[string]cloudDNSRecord, len(b.cache))
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call := b.client.ResourceRecordSets.List(b.project, b.zone)
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err := call.Pages(ctx, func(page *dns.ResourceRecordSetsListResponse) error {
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for _, v := range page.Rrsets {
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if v == nil {
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continue
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}
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if v.Name == dnsName && v.Type == dnsType {
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record = v
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}
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b.cache[dnsName+"-"+dnsType] = cloudDNSRecord{*v}
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}
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return nil // NOTE: returning a non-nil error stops pagination.
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})
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b.mutex.Unlock()
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if err != nil {
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return nil, err
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}
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return cloudDNSRecord{*record}, nil
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}
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func (b *cloudDNSBackend) UpdateRecords(ctx context.Context, additions []backend.DNSRecord, deletions []backend.DNSRecord) error {
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a := []*dns.ResourceRecordSet{}
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d := []*dns.ResourceRecordSet{}
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for _, r := range additions {
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a = append(a, &dns.ResourceRecordSet{
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Name: r.Name(),
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Type: r.Type(),
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Ttl: r.Ttl(),
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Rrdatas: r.Data(),
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})
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}
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for _, r := range deletions {
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d = append(d, &dns.ResourceRecordSet{
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Name: r.Name(),
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Type: r.Type(),
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Ttl: r.Ttl(),
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Rrdatas: r.Data(),
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})
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}
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change := &dns.Change{
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Additions: a,
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Deletions: d,
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}
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_, err := b.client.Changes.Create(b.project, b.zone, change).Context(ctx).Do()
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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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