141 lines
3.9 KiB
Go
141 lines
3.9 KiB
Go
/*
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* Minio Cloud Storage, (C) 2018 Minio, Inc.
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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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*/
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package dns
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import (
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"context"
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"encoding/json"
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"errors"
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"fmt"
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"net"
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"sort"
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"strconv"
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"strings"
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"time"
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"github.com/coredns/coredns/plugin/etcd/msg"
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etcd "github.com/coreos/etcd/client"
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)
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// create a new coredns service record for the bucket.
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func newCoreDNSMsg(bucket string, ip string, port int, ttl uint32) ([]byte, error) {
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return json.Marshal(&SrvRecord{
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Host: ip,
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Port: port,
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TTL: ttl,
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CreationDate: time.Now().UTC(),
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})
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}
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// Retrieves list of DNS entries for a bucket.
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func (c *coreDNS) List() ([]SrvRecord, error) {
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kapi := etcd.NewKeysAPI(c.etcdClient)
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key := msg.Path(fmt.Sprintf("%s.", c.domainName), defaultPrefixPath)
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ctx, cancel := context.WithTimeout(context.Background(), defaultContextTimeout)
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r, err := kapi.Get(ctx, key, nil)
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cancel()
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if err != nil {
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return nil, err
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}
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var srvRecords []SrvRecord
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for _, n := range r.Node.Nodes {
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var srvRecord SrvRecord
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if err = json.Unmarshal([]byte(n.Value), &srvRecord); err != nil {
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return nil, err
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}
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srvRecord.Key = strings.TrimPrefix(n.Key, key)
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srvRecords = append(srvRecords, srvRecord)
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}
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sort.Slice(srvRecords, func(i int, j int) bool {
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return srvRecords[i].Key < srvRecords[j].Key
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})
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return srvRecords, nil
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}
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// Retrieves DNS record for a bucket.
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func (c *coreDNS) Get(bucket string) (SrvRecord, error) {
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kapi := etcd.NewKeysAPI(c.etcdClient)
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key := msg.Path(fmt.Sprintf("%s.%s.", bucket, c.domainName), defaultPrefixPath)
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ctx, cancel := context.WithTimeout(context.Background(), defaultContextTimeout)
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r, err := kapi.Get(ctx, key, nil)
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cancel()
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if err != nil {
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return SrvRecord{}, err
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}
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var sr SrvRecord
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if err = json.Unmarshal([]byte(r.Node.Value), &sr); err != nil {
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return SrvRecord{}, err
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}
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sr.Key = strings.TrimPrefix(r.Node.Key, key)
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return sr, nil
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}
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// Adds DNS entries into etcd endpoint in CoreDNS etcd messae format.
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func (c *coreDNS) Put(bucket string) error {
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bucketMsg, err := newCoreDNSMsg(bucket, c.domainIP, c.domainPort, defaultTTL)
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if err != nil {
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return err
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}
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kapi := etcd.NewKeysAPI(c.etcdClient)
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key := msg.Path(fmt.Sprintf("%s.%s.", bucket, c.domainName), defaultPrefixPath)
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ctx, cancel := context.WithTimeout(context.Background(), defaultContextTimeout)
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_, err = kapi.Set(ctx, key, string(bucketMsg), nil)
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cancel()
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return err
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}
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// Removes DNS entries added in Put().
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func (c *coreDNS) Delete(bucket string) error {
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kapi := etcd.NewKeysAPI(c.etcdClient)
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key := msg.Path(fmt.Sprintf("%s.%s.", bucket, c.domainName), defaultPrefixPath)
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ctx, cancel := context.WithTimeout(context.Background(), defaultContextTimeout)
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_, err := kapi.Delete(ctx, key, nil)
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cancel()
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return err
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}
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// CoreDNS - represents dns config for coredns server.
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type coreDNS struct {
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domainName, domainIP string
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domainPort int
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etcdClient etcd.Client
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}
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// NewCoreDNS - initialize a new coreDNS set/unset values.
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func NewCoreDNS(domainName, domainIP, domainPort string, etcdClient etcd.Client) (Config, error) {
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if domainName == "" || domainIP == "" || etcdClient == nil {
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return nil, errors.New("invalid argument")
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}
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if net.ParseIP(domainIP) == nil {
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return nil, errors.New("invalid argument")
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}
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port, err := strconv.Atoi(domainPort)
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if err != nil {
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return nil, err
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}
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return &coreDNS{
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domainName: domainName,
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domainIP: domainIP,
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domainPort: port,
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etcdClient: etcdClient,
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}, nil
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}
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