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5d740dce6a
When batching changes, it is often handy to know whether a changeset IsEmpty, and thus does not need to be Apply-ed.
128 lines
3.5 KiB
Go
128 lines
3.5 KiB
Go
/*
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Copyright 2016 The Kubernetes Authors.
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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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http://www.apache.org/licenses/LICENSE-2.0
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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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*/
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package coredns
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import (
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"encoding/json"
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"fmt"
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etcdc "github.com/coreos/etcd/client"
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dnsmsg "github.com/miekg/coredns/middleware/etcd/msg"
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"golang.org/x/net/context"
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"hash/fnv"
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"k8s.io/kubernetes/federation/pkg/dnsprovider"
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)
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// Compile time check for interface adherence
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var _ dnsprovider.ResourceRecordChangeset = &ResourceRecordChangeset{}
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type ChangeSetType string
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const (
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ADDITION = ChangeSetType("ADDITION")
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DELETION = ChangeSetType("DELETION")
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)
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type ChangeSet struct {
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cstype ChangeSetType
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rrset dnsprovider.ResourceRecordSet
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}
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type ResourceRecordChangeset struct {
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zone *Zone
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rrsets *ResourceRecordSets
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changeset []ChangeSet
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}
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func (c *ResourceRecordChangeset) Add(rrset dnsprovider.ResourceRecordSet) dnsprovider.ResourceRecordChangeset {
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c.changeset = append(c.changeset, ChangeSet{cstype: ADDITION, rrset: rrset})
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return c
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}
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func (c *ResourceRecordChangeset) Remove(rrset dnsprovider.ResourceRecordSet) dnsprovider.ResourceRecordChangeset {
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c.changeset = append(c.changeset, ChangeSet{cstype: DELETION, rrset: rrset})
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return c
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}
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func (c *ResourceRecordChangeset) IsEmpty() bool {
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return len(c.changeset) == 0
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}
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func (c *ResourceRecordChangeset) Apply() error {
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ctx := context.Background()
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etcdPathPrefix := c.zone.zones.intf.etcdPathPrefix
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getOpts := &etcdc.GetOptions{}
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setOpts := &etcdc.SetOptions{}
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deleteOpts := &etcdc.DeleteOptions{
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Recursive: true,
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}
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for _, changeset := range c.changeset {
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switch changeset.cstype {
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case ADDITION:
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for _, rrdata := range changeset.rrset.Rrdatas() {
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b, err := json.Marshal(&dnsmsg.Service{Host: rrdata, TTL: uint32(changeset.rrset.Ttl()), Group: changeset.rrset.Name()})
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if err != nil {
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return err
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}
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recordValue := string(b)
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recordLabel := getHash(rrdata)
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recordKey := buildDNSNameString(changeset.rrset.Name(), recordLabel)
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response, err := c.zone.zones.intf.etcdKeysAPI.Get(ctx, dnsmsg.Path(recordKey, etcdPathPrefix), getOpts)
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if err == nil && response != nil {
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return fmt.Errorf("Key already exist, key: %v", recordKey)
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}
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_, err = c.zone.zones.intf.etcdKeysAPI.Set(ctx, dnsmsg.Path(recordKey, etcdPathPrefix), recordValue, setOpts)
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if err != nil {
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return err
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}
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}
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case DELETION:
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for _, rrdata := range changeset.rrset.Rrdatas() {
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recordLabel := getHash(rrdata)
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recordKey := buildDNSNameString(changeset.rrset.Name(), recordLabel)
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_, err := c.zone.zones.intf.etcdKeysAPI.Delete(ctx, dnsmsg.Path(recordKey, etcdPathPrefix), deleteOpts)
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if err != nil {
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return err
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}
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}
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// TODO: We need to cleanup empty dirs in etcd
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}
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}
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return nil
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}
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func getHash(text string) string {
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h := fnv.New32a()
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h.Write([]byte(text))
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return fmt.Sprintf("%x", h.Sum32())
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}
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func buildDNSNameString(labels ...string) string {
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var res string
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for _, label := range labels {
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if res == "" {
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res = label
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} else {
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res = fmt.Sprintf("%s.%s", label, res)
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}
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}
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return res
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}
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