/
broker.go
162 lines (135 loc) · 3.55 KB
/
broker.go
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package kag
import (
"context"
"fmt"
"io"
"strings"
"github.com/pkg/errors"
"github.com/savaki/franz"
"golang.org/x/sync/errgroup"
)
type broker struct {
nodeID int32
conn *franz.Conn
w io.Writer
}
func (b *broker) debug(layout string, args ...interface{}) {
if b.w == nil {
return
}
if !strings.HasSuffix(layout, "\n") {
layout += "\n"
}
fmt.Fprintf(b.w, layout, args...)
}
// fetchTopicOffsets => offset -1 for newest, -2 for oldest
func (b *broker) fetchTopicOffsets(metadata *franz.MetadataResponseV0, offset int64) (topicOffsets, error) {
input := makeListOffsetRequestV1(b.nodeID, metadata, offset)
b.debug("fetching topic offsets for broker, %v", b.nodeID)
resp, err := b.conn.ListOffsetsV1(input)
if err != nil {
return nil, errors.Wrapf(err, "unable to list offsets for broker, %v", b.conn.RemoteAddr())
}
offsets := topicOffsets{}
for _, t := range resp.Responses {
for _, p := range t.PartitionResponses {
offsets.add(t.Topic, p.Partition, p.Offset)
}
}
return offsets, nil
}
func (b *broker) fetchGroupOffsets(topics []franz.OffsetFetchRequestV3Topic) (groupOffsets, error) {
resp, err := b.conn.ListGroupsV1(franz.ListGroupsRequestV1{})
if err != nil {
return nil, errors.Wrapf(err, "unable to list groups for broker, %v", b.conn.RemoteAddr())
}
offsets := groupOffsets{}
b.debug("fetching group offsets for broker, %v", b.nodeID)
for _, group := range resp.Groups {
offsetFetch, err := b.conn.OffsetFetchV3(franz.OffsetFetchRequestV3{
GroupID: group.GroupID,
Topics: topics,
})
if err != nil {
return nil, errors.Wrapf(err, "unable to fetch offset for consumer group, %v", group.GroupID)
}
for _, r := range removeEmpty(offsetFetch.Responses) {
for _, pr := range r.PartitionResponses {
offsets.add(group.GroupID, r.Topic, pr.Partition, pr.Offset)
}
}
}
return offsets, nil
}
func (b *broker) Close() error {
return b.conn.Close()
}
func newBroker(nodeID int32, conn *franz.Conn, debug io.Writer) *broker {
return &broker{
nodeID: nodeID,
conn: conn,
w: debug,
}
}
type brokerArray []*broker
func (b brokerArray) fetchTopicOffsets(ctx context.Context, metadata *franz.MetadataResponseV0, offset int64) (topicOffsets, error) {
results := make(chan topicOffsets, len(b))
group := &errgroup.Group{}
for _, item := range b {
broker := item
group.Go(func() error {
offsets, err := broker.fetchTopicOffsets(metadata, offset)
if err == nil {
results <- offsets
}
return err
})
}
group.Wait()
close(results)
all := topicOffsets{}
for offset := range results {
for topic, partitions := range offset {
for partition, offset := range partitions {
all.add(topic, partition, offset)
}
}
}
return all, nil
}
func (b brokerArray) fetchGroupOffsets(ctx context.Context, metadata *franz.MetadataResponseV0) (groupOffsets, error) {
results := make(chan groupOffsets, len(b))
topics := makeTopics(metadata.Topics)
group := &errgroup.Group{}
for _, item := range b {
broker := item
group.Go(func() error {
offsets, err := broker.fetchGroupOffsets(topics)
if err == nil {
results <- offsets
}
return err
})
}
group.Wait()
close(results)
all := groupOffsets{}
for offset := range results {
for groupID, topics := range offset {
for topic, partitions := range topics {
for partition, offset := range partitions {
all.add(groupID, topic, partition, offset)
}
}
}
}
return all, nil
}
func (b brokerArray) Close() (err error) {
for _, broker := range b {
if v := broker.Close(); v != nil {
err = v
}
}
return
}