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|
package sarama
type OffsetFetchRequest struct {
Version int16
ConsumerGroup string
RequireStable bool // requires v7+
partitions map[string][]int32
}
func (r *OffsetFetchRequest) setVersion(v int16) {
r.Version = v
}
func NewOffsetFetchRequest(
version KafkaVersion,
group string,
partitions map[string][]int32,
) *OffsetFetchRequest {
request := &OffsetFetchRequest{
ConsumerGroup: group,
partitions: partitions,
}
if version.IsAtLeast(V2_5_0_0) {
// Version 7 is adding the require stable flag.
request.Version = 7
} else if version.IsAtLeast(V2_4_0_0) {
// Version 6 is the first flexible version.
request.Version = 6
} else if version.IsAtLeast(V2_1_0_0) {
// Version 3, 4, and 5 are the same as version 2.
request.Version = 5
} else if version.IsAtLeast(V2_0_0_0) {
request.Version = 4
} else if version.IsAtLeast(V0_11_0_0) {
request.Version = 3
} else if version.IsAtLeast(V0_10_2_0) {
// Starting in version 2, the request can contain a null topics array to indicate that offsets
// for all topics should be fetched. It also returns a top level error code
// for group or coordinator level errors.
request.Version = 2
} else if version.IsAtLeast(V0_8_2_0) {
// In version 0, the request read offsets from ZK.
//
// Starting in version 1, the broker supports fetching offsets from the internal __consumer_offsets topic.
request.Version = 1
}
return request
}
func (r *OffsetFetchRequest) encode(pe packetEncoder) (err error) {
if r.Version < 0 || r.Version > 7 {
return PacketEncodingError{"invalid or unsupported OffsetFetchRequest version field"}
}
err = pe.putString(r.ConsumerGroup)
if err != nil {
return err
}
if r.partitions == nil && r.Version >= 2 {
if err := pe.putArrayLength(-1); err != nil {
return err
}
} else {
if err = pe.putArrayLength(len(r.partitions)); err != nil {
return err
}
}
for topic, partitions := range r.partitions {
err = pe.putString(topic)
if err != nil {
return err
}
err = pe.putInt32Array(partitions)
if err != nil {
return err
}
pe.putEmptyTaggedFieldArray()
}
if r.RequireStable && r.Version < 7 {
return PacketEncodingError{"requireStable is not supported. use version 7 or later"}
}
if r.Version >= 7 {
pe.putBool(r.RequireStable)
}
pe.putEmptyTaggedFieldArray()
return nil
}
func (r *OffsetFetchRequest) decode(pd packetDecoder, version int16) (err error) {
r.Version = version
r.ConsumerGroup, err = pd.getString()
if err != nil {
return err
}
partitionCount, err := pd.getArrayLength()
if err != nil {
return err
}
if (partitionCount == 0 && version < 2) || partitionCount < 0 {
return nil
}
r.partitions = make(map[string][]int32, partitionCount)
for i := 0; i < partitionCount; i++ {
topic, err := pd.getString()
if err != nil {
return err
}
partitions, err := pd.getInt32Array()
if err != nil {
return err
}
_, err = pd.getEmptyTaggedFieldArray()
if err != nil {
return err
}
r.partitions[topic] = partitions
}
if r.Version >= 7 {
r.RequireStable, err = pd.getBool()
if err != nil {
return err
}
}
_, err = pd.getEmptyTaggedFieldArray()
return err
}
func (r *OffsetFetchRequest) key() int16 {
return apiKeyOffsetFetch
}
func (r *OffsetFetchRequest) version() int16 {
return r.Version
}
func (r *OffsetFetchRequest) headerVersion() int16 {
if r.Version >= 6 {
return 2
}
return 1
}
func (r *OffsetFetchRequest) isValidVersion() bool {
return r.Version >= 0 && r.Version <= 7
}
func (r *OffsetFetchRequest) isFlexible() bool {
return r.isFlexibleVersion(r.Version)
}
func (r *OffsetFetchRequest) isFlexibleVersion(version int16) bool {
return version >= 6
}
func (r *OffsetFetchRequest) requiredVersion() KafkaVersion {
switch r.Version {
case 7:
return V2_5_0_0
case 6:
return V2_4_0_0
case 5:
return V2_1_0_0
case 4:
return V2_0_0_0
case 3:
return V0_11_0_0
case 2:
return V0_10_2_0
case 1:
return V0_8_2_0
case 0:
return V0_8_2_0
default:
return V2_5_0_0
}
}
func (r *OffsetFetchRequest) ZeroPartitions() {
if r.partitions == nil && r.Version >= 2 {
r.partitions = make(map[string][]int32)
}
}
func (r *OffsetFetchRequest) AddPartition(topic string, partitionID int32) {
if r.partitions == nil {
r.partitions = make(map[string][]int32)
}
r.partitions[topic] = append(r.partitions[topic], partitionID)
}
|
