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List exact DNS entries for a requested bucketName (#6936)

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Currently we would end up considering common prefix
buckets to be part of the same DNS service record,
which leads to Minio server wrongly forwarding the
records to incorrect IPs.
This commit is contained in:
Harshavardhana 2018-12-12 10:47:03 -08:00 committed by kannappanr
parent 21d8c0fd13
commit 3498f5b0ec
1 changed files with 30 additions and 9 deletions
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39
pkg/dns/etcd_dns.go
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@ -85,16 +85,28 @@ func (c *coreDNS) list(key string) ([]SrvRecord, error) {
}
srvRecord.Key = strings.TrimPrefix(string(n.Key), key)
srvRecord.Key = strings.TrimSuffix(srvRecord.Key, srvRecord.Host)
srvRecords = append(srvRecords, srvRecord)
// SRV records are stored in the following form
// /skydns/net/miniocloud/bucket1, so this function serves multiple
// purposes basically when we do a Get(bucketName) this function
// should return a single DNS record for any input 'bucketName'.
//
// In all other situations when we want to list all DNS records,
// which is handled in the else clause.
if key != msg.Path(fmt.Sprintf(".%s.", c.domainName), defaultPrefixPath) {
if srvRecord.Key == "/" {
srvRecords = append(srvRecords, srvRecord)
}
} else {
srvRecords = append(srvRecords, srvRecord)
}
}
if srvRecords != nil {
sort.Slice(srvRecords, func(i int, j int) bool {
return srvRecords[i].Key < srvRecords[j].Key
})
} else {
if len(srvRecords) == 0 {
return nil, ErrNoEntriesFound
}
sort.Slice(srvRecords, func(i int, j int) bool {
return srvRecords[i].Key < srvRecords[j].Key
})
return srvRecords, nil
}
@ -123,9 +135,18 @@ func (c *coreDNS) Put(bucket string) error {
// Removes DNS entries added in Put().
func (c *coreDNS) Delete(bucket string) error {
key := msg.Path(fmt.Sprintf("%s.%s.", bucket, c.domainName), defaultPrefixPath)
ctx, cancel := context.WithTimeout(context.Background(), defaultContextTimeout)
_, err := c.etcdClient.Delete(ctx, key)
defer cancel()
srvRecords, err := c.list(key)
if err != nil {
return err
}
for _, record := range srvRecords {
dctx, dcancel := context.WithTimeout(context.Background(), defaultContextTimeout)
if _, err = c.etcdClient.Delete(dctx, key+"/"+record.Host); err != nil {
dcancel()
return err
}
dcancel()
}
return err
}