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Copy pathoffset_fetch_request.go
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371 lines (324 loc) · 8.47 KB
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package sarama
// OffsetFetchRequestGroup is a per-group entry in an OffsetFetch v8+ request.
// A nil Partitions map fetches offsets for all topics in the group.
type OffsetFetchRequestGroup struct {
GroupId string
Partitions map[string][]int32
}
func (g *OffsetFetchRequestGroup) AddPartition(topic string, partitionID int32) {
if g.Partitions == nil {
g.Partitions = make(map[string][]int32)
}
g.Partitions[topic] = append(g.Partitions[topic], partitionID)
}
type OffsetFetchRequest struct {
Version int16
ConsumerGroup string // v0-7; on v8+ populate Groups instead
RequireStable bool // v7+
partitions map[string][]int32
Groups []OffsetFetchRequestGroup // v8+
}
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(V3_0_0_0) {
// Version 8 is adding support for fetching offsets for multiple groups at a time.
request.Version = 8
request.Groups = []OffsetFetchRequestGroup{{GroupId: group, Partitions: partitions}}
return request
}
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 > 8 {
return PacketEncodingError{"invalid or unsupported OffsetFetchRequest version field"}
}
if r.RequireStable && r.Version < 7 {
return PacketEncodingError{"requireStable is not supported. use version 7 or later"}
}
if r.Version >= 8 {
if len(r.Groups) == 0 {
return PacketEncodingError{"version 8 or later requires Groups to be populated"}
}
if err := pe.putArrayLength(len(r.Groups)); err != nil {
return err
}
for _, g := range r.Groups {
if err := pe.putString(g.GroupId); err != nil {
return err
}
// nil Partitions encodes as null topics array (fetch all)
topicCount := len(g.Partitions)
if g.Partitions == nil {
topicCount = -1
}
if err := pe.putArrayLength(topicCount); err != nil {
return err
}
for topic, partitions := range g.Partitions {
if err := pe.putString(topic); err != nil {
return err
}
if err := pe.putInt32Array(partitions); err != nil {
return err
}
pe.putEmptyTaggedFieldArray()
}
pe.putEmptyTaggedFieldArray()
}
pe.putBool(r.RequireStable)
pe.putEmptyTaggedFieldArray()
return nil
}
if len(r.Groups) > 1 {
return PacketEncodingError{"multiple groups require version 8 or later"}
}
consumerGroup := r.ConsumerGroup
partitions := r.partitions
if consumerGroup == "" && len(r.Groups) == 1 {
consumerGroup = r.Groups[0].GroupId
partitions = r.Groups[0].Partitions
}
err = pe.putString(consumerGroup)
if err != nil {
return err
}
if partitions == nil && r.Version >= 2 {
if err := pe.putArrayLength(-1); err != nil {
return err
}
} else {
if err = pe.putArrayLength(len(partitions)); err != nil {
return err
}
}
for topic, partitions := range partitions {
err = pe.putString(topic)
if err != nil {
return err
}
err = pe.putInt32Array(partitions)
if err != nil {
return err
}
pe.putEmptyTaggedFieldArray()
}
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
if r.Version >= 8 {
groupCount, err := pd.getArrayLength()
if err != nil {
return err
}
if groupCount < 0 {
return errInvalidArrayLength
}
if groupCount > 0 {
r.Groups = make([]OffsetFetchRequestGroup, groupCount)
}
for i := range groupCount {
groupID, err := pd.getString()
if err != nil {
return err
}
r.Groups[i].GroupId = groupID
// peek first byte to distinguish null (0x00) from empty (0x01)
topicCountMarker, err := pd.peekInt8(0)
if err != nil {
return err
}
topicCount, err := pd.getArrayLength()
if err != nil {
return err
}
if topicCountMarker != 0 {
partitions := make(map[string][]int32, topicCount)
for range topicCount {
topic, err := pd.getString()
if err != nil {
return err
}
ps, err := pd.getInt32Array()
if err != nil {
return err
}
if _, err := pd.getEmptyTaggedFieldArray(); err != nil {
return err
}
partitions[topic] = ps
}
r.Groups[i].Partitions = partitions
}
if _, err := pd.getEmptyTaggedFieldArray(); err != nil {
return err
}
}
r.RequireStable, err = pd.getBool()
if err != nil {
return err
}
_, err = pd.getEmptyTaggedFieldArray()
return err
}
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 range partitionCount {
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 <= 8
}
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 8:
return V3_0_0_0
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.Version >= 8 {
if len(r.Groups) == 0 {
r.Groups = []OffsetFetchRequestGroup{{GroupId: r.ConsumerGroup}}
}
if r.Groups[0].Partitions == nil {
r.Groups[0].Partitions = make(map[string][]int32)
}
return
}
if r.partitions == nil && r.Version >= 2 {
r.partitions = make(map[string][]int32)
}
}
// AddPartition appends a partition to the request. On v8+ it targets Groups[0]
// (seeded from ConsumerGroup if needed); use AddGroupPartition for v8 batches.
func (r *OffsetFetchRequest) AddPartition(topic string, partitionID int32) {
if r.Version >= 8 {
if len(r.Groups) == 0 {
r.Groups = []OffsetFetchRequestGroup{{GroupId: r.ConsumerGroup}}
}
r.Groups[0].AddPartition(topic, partitionID)
return
}
if r.partitions == nil {
r.partitions = make(map[string][]int32)
}
r.partitions[topic] = append(r.partitions[topic], partitionID)
}
// AddGroupPartition adds a partition under group in a v8+ batch, creating the
// group entry if absent.
func (r *OffsetFetchRequest) AddGroupPartition(group, topic string, partitionID int32) {
for i := range r.Groups {
if r.Groups[i].GroupId == group {
r.Groups[i].AddPartition(topic, partitionID)
return
}
}
g := OffsetFetchRequestGroup{GroupId: group}
g.AddPartition(topic, partitionID)
r.Groups = append(r.Groups, g)
}