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package sarama
import "encoding/base64"
type Uuid [16]byte
func (u Uuid) String() string {
return base64.URLEncoding.WithPadding(base64.NoPadding).EncodeToString(u[:])
}
var NullUUID = []byte{0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0}
type MetadataRequest struct {
// Version defines the protocol version to use for encode and decode
Version int16
// Topics contains the topics to fetch metadata for.
Topics []string
// AllowAutoTopicCreation contains a If this is true, the broker may auto-create topics that we requested which do not already exist, if it is configured to do so.
AllowAutoTopicCreation bool
IncludeClusterAuthorizedOperations bool // version 8 and up
IncludeTopicAuthorizedOperations bool // version 8 and up
}
func NewMetadataRequest(version KafkaVersion, topics []string) *MetadataRequest {
m := &MetadataRequest{Topics: topics}
if version.IsAtLeast(V2_8_0_0) {
m.Version = 10
} else if version.IsAtLeast(V2_4_0_0) {
m.Version = 9
} else if version.IsAtLeast(V2_4_0_0) {
m.Version = 8
} else if version.IsAtLeast(V2_1_0_0) {
m.Version = 7
} else if version.IsAtLeast(V2_0_0_0) {
m.Version = 6
} else if version.IsAtLeast(V1_0_0_0) {
m.Version = 5
} else if version.IsAtLeast(V0_11_0_0) {
m.Version = 4
} else if version.IsAtLeast(V0_10_1_0) {
m.Version = 2
} else if version.IsAtLeast(V0_10_0_0) {
m.Version = 1
}
return m
}
func (r *MetadataRequest) encode(pe packetEncoder) (err error) {
if r.Version < 0 || r.Version > 10 {
return PacketEncodingError{"invalid or unsupported MetadataRequest version field"}
}
if r.Version == 0 || len(r.Topics) > 0 {
if r.Version < 9 {
err := pe.putArrayLength(len(r.Topics))
if err != nil {
return err
}
for i := range r.Topics {
err = pe.putString(r.Topics[i])
if err != nil {
return err
}
}
} else if r.Version == 9 {
pe.putCompactArrayLength(len(r.Topics))
for _, topicName := range r.Topics {
if err := pe.putCompactString(topicName); err != nil {
return err
}
pe.putEmptyTaggedFieldArray()
}
} else { // r.Version = 10
pe.putCompactArrayLength(len(r.Topics))
for _, topicName := range r.Topics {
if err := pe.putRawBytes(NullUUID); err != nil {
return err
}
// Avoid implicit memory aliasing in for loop
tn := topicName
if err := pe.putNullableCompactString(&tn); err != nil {
return err
}
pe.putEmptyTaggedFieldArray()
}
}
} else {
if r.Version < 9 {
pe.putInt32(-1)
} else {
pe.putCompactArrayLength(-1)
}
}
if r.Version > 3 {
pe.putBool(r.AllowAutoTopicCreation)
}
if r.Version > 7 {
pe.putBool(r.IncludeClusterAuthorizedOperations)
pe.putBool(r.IncludeTopicAuthorizedOperations)
}
if r.Version > 8 {
pe.putEmptyTaggedFieldArray()
}
return nil
}
func (r *MetadataRequest) decode(pd packetDecoder, version int16) (err error) {
r.Version = version
if r.Version < 9 {
size, err := pd.getInt32()
if err != nil {
return err
}
if size > 0 {
r.Topics = make([]string, size)
for i := range r.Topics {
topic, err := pd.getString()
if err != nil {
return err
}
r.Topics[i] = topic
}
}
} else if r.Version == 9 {
size, err := pd.getCompactArrayLength()
if err != nil {
return err
}
if size > 0 {
r.Topics = make([]string, size)
}
for i := range r.Topics {
topic, err := pd.getCompactString()
if err != nil {
return err
}
r.Topics[i] = topic
if _, err := pd.getEmptyTaggedFieldArray(); err != nil {
return err
}
}
} else { // version 10+
size, err := pd.getCompactArrayLength()
if err != nil {
return err
}
if size > 0 {
r.Topics = make([]string, size)
}
for i := range r.Topics {
if _, err = pd.getRawBytes(16); err != nil { // skip UUID
return err
}
topic, err := pd.getCompactNullableString()
if err != nil {
return err
}
if topic != nil {
r.Topics[i] = *topic
}
if _, err := pd.getEmptyTaggedFieldArray(); err != nil {
return err
}
}
}
if r.Version >= 4 {
if r.AllowAutoTopicCreation, err = pd.getBool(); err != nil {
return err
}
}
if r.Version > 7 {
includeClusterAuthz, err := pd.getBool()
if err != nil {
return err
}
r.IncludeClusterAuthorizedOperations = includeClusterAuthz
includeTopicAuthz, err := pd.getBool()
if err != nil {
return err
}
r.IncludeTopicAuthorizedOperations = includeTopicAuthz
}
if r.Version > 8 {
if _, err := pd.getEmptyTaggedFieldArray(); err != nil {
return err
}
}
return nil
}
func (r *MetadataRequest) key() int16 {
return 3
}
func (r *MetadataRequest) version() int16 {
return r.Version
}
func (r *MetadataRequest) headerVersion() int16 {
if r.Version >= 9 {
return 2
}
return 1
}
func (r *MetadataRequest) isValidVersion() bool {
return r.Version >= 0 && r.Version <= 10
}
func (r *MetadataRequest) requiredVersion() KafkaVersion {
switch r.Version {
case 10:
return V2_8_0_0
case 9:
return V2_4_0_0
case 8:
return V2_3_0_0
case 7:
return V2_1_0_0
case 6:
return V2_0_0_0
case 5:
return V1_0_0_0
case 3, 4:
return V0_11_0_0
case 2:
return V0_10_1_0
case 1:
return V0_10_0_0
case 0:
return V0_8_2_0
default:
return V2_8_0_0
}
}
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