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query.go
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query.go
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package consumergroup
import (
"sync"
"github.com/Shopify/sarama"
"github.com/elastic/beats/libbeat/common"
"github.com/elastic/beats/libbeat/logp"
"github.com/elastic/beats/metricbeat/module/kafka"
)
type client interface {
ListGroups() ([]string, error)
DescribeGroups(group []string) (map[string]kafka.GroupDescription, error)
FetchGroupOffsets(group string) (*sarama.OffsetFetchResponse, error)
}
func fetchGroupInfo(
emit func(common.MapStr),
b client,
groupsFilter, topicsFilter func(string) bool,
) error {
type result struct {
err error
group string
off *sarama.OffsetFetchResponse
}
groups, err := listGroups(b, groupsFilter)
if err != nil {
logp.Err("failed to list known kafka groups: %v", err)
return err
}
if len(groups) == 0 {
return nil
}
debugf("known consumer groups: ", groups)
wg := sync.WaitGroup{}
results := make(chan result, len(groups))
for _, group := range groups {
group := group
wg.Add(1)
go func() {
defer wg.Done()
resp, err := fetchGroupOffset(b, group, topicsFilter)
if err != nil {
logp.Err("failed to fetch '%v' group offset: %v", group, err)
}
results <- result{err, group, resp}
}()
}
go func() {
wg.Wait()
close(results)
}()
assignments, err := fetchGroupAssignments(b, groups)
if err != nil {
// wait for workers to stop and drop results
for range results {
}
return err
}
for ret := range results {
if err := ret.err; err != nil {
// wait for workers to stop and drop results
for range results {
}
return err
}
asgnGroup := assignments[ret.group]
for topic, partitions := range ret.off.Blocks {
var asgnTopic map[int32]groupAssignment
if asgnGroup != nil {
asgnTopic = asgnGroup[topic]
}
for partition, info := range partitions {
event := common.MapStr{
"id": ret.group,
"topic": topic,
"partition": partition,
"offset": info.Offset,
"meta": info.Metadata,
"error": common.MapStr{
"code": info.Err,
},
}
if asgnTopic != nil {
if assignment, found := asgnTopic[partition]; found {
event["client"] = common.MapStr{
"id": assignment.clientID,
"host": assignment.clientHost,
"member_id": assignment.memberID,
}
}
}
emit(event)
}
}
}
return nil
}
func listGroups(b client, filter func(string) bool) ([]string, error) {
groups, err := b.ListGroups()
if err != nil {
return nil, err
}
if filter == nil {
return groups, nil
}
filtered := groups[:0]
for _, name := range groups {
if filter(name) {
filtered = append(filtered, name)
}
}
return filtered, nil
}
func fetchGroupAssignments(
b client,
groupIDs []string,
) (map[string]map[string]map[int32]groupAssignment, error) {
resp, err := b.DescribeGroups(groupIDs)
if err != nil {
return nil, err
}
groups := map[string]map[string]map[int32]groupAssignment{}
groupLoop:
for groupID, info := range resp {
G := groups[groupID]
if G == nil {
G = map[string]map[int32]groupAssignment{}
groups[groupID] = G
}
for memberID, memberDescr := range info.Members {
if memberDescr.Err != nil {
// group doesn't seem to use standardized member assignment encoding
// => try next group
continue groupLoop
}
clientID := memberDescr.ClientID
clientHost := memberDescr.ClientHost
if len(clientHost) > 1 && clientHost[0] == '/' {
clientHost = clientHost[1:]
}
meta := groupAssignment{
memberID: memberID,
clientID: clientID,
clientHost: clientHost,
}
for topic, partitions := range memberDescr.Topics {
T := G[topic]
if T == nil {
T = map[int32]groupAssignment{}
G[topic] = T
}
for _, partition := range partitions {
T[partition] = meta
}
}
}
}
return groups, nil
}
func fetchGroupOffset(
b client,
group string,
topics func(string) bool,
) (*sarama.OffsetFetchResponse, error) {
resp, err := b.FetchGroupOffsets(group)
if err != nil {
return nil, err
}
if topics == nil {
return resp, err
}
for topic := range resp.Blocks {
if !topics(topic) {
delete(resp.Blocks, topic)
}
}
return resp, nil
}