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broker.go
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broker.go
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package kafka
import (
"bytes"
"crypto/tls"
"fmt"
"io"
"net"
"os"
"strings"
"time"
"github.com/Shopify/sarama"
"github.com/elastic/beats/libbeat/common"
)
// Broker provides functionality for communicating with a single kafka broker
type Broker struct {
broker *sarama.Broker
cfg *sarama.Config
advertisedAddr string
id int32
matchID bool
}
// BrokerSettings defines common configurations used when connecting to a broker
type BrokerSettings struct {
MatchID bool
DialTimeout, ReadTimeout time.Duration
ClientID string
Retries int
Backoff time.Duration
TLS *tls.Config
Username, Password string
Version Version
}
type GroupDescription struct {
Members map[string]MemberDescription
}
type MemberDescription struct {
Err error
ClientID string
ClientHost string
Topics map[string][]int32
}
const noID = -1
// NewBroker creates a new unconnected kafka Broker connection instance.
func NewBroker(host string, settings BrokerSettings) *Broker {
cfg := sarama.NewConfig()
cfg.Net.DialTimeout = settings.DialTimeout
cfg.Net.ReadTimeout = settings.ReadTimeout
cfg.ClientID = settings.ClientID
cfg.Metadata.Retry.Max = settings.Retries
cfg.Metadata.Retry.Backoff = settings.Backoff
if tls := settings.TLS; tls != nil {
cfg.Net.TLS.Enable = true
cfg.Net.TLS.Config = tls
}
if user := settings.Username; user != "" {
cfg.Net.SASL.Enable = true
cfg.Net.SASL.User = user
cfg.Net.SASL.Password = settings.Password
}
cfg.Version = settings.Version.get()
return &Broker{
broker: sarama.NewBroker(host),
cfg: cfg,
id: noID,
matchID: settings.MatchID,
}
}
// Close the broker connection
func (b *Broker) Close() error {
closeBroker(b.broker)
return nil
}
// Connect connects the broker to the configured host
func (b *Broker) Connect() error {
if err := b.broker.Open(b.cfg); err != nil {
return err
}
if b.id != noID || !b.matchID {
return nil
}
// current broker is bootstrap only. Get metadata to find id:
meta, err := queryMetadataWithRetry(b.broker, b.cfg, nil)
if err != nil {
closeBroker(b.broker)
return err
}
other := findMatchingBroker(brokerAddress(b.broker), meta.Brokers)
if other == nil { // no broker found
closeBroker(b.broker)
return fmt.Errorf("No advertised broker with address %v found", b.Addr())
}
debugf("found matching broker %v with id %v", other.Addr(), other.ID())
b.id = other.ID()
b.advertisedAddr = other.Addr()
return nil
}
// Addr returns the configured broker endpoint.
func (b *Broker) Addr() string {
return b.broker.Addr()
}
// AdvertisedAddr returns the advertised broker address in case of
// matching broker has been found.
func (b *Broker) AdvertisedAddr() string {
return b.advertisedAddr
}
// GetMetadata fetches most recent cluster metadata from the broker.
func (b *Broker) GetMetadata(topics ...string) (*sarama.MetadataResponse, error) {
return queryMetadataWithRetry(b.broker, b.cfg, topics)
}
// GetTopicsMetadata fetches most recent topics/partition metadata from the broker.
func (b *Broker) GetTopicsMetadata(topics ...string) ([]*sarama.TopicMetadata, error) {
r, err := b.GetMetadata(topics...)
if err != nil {
return nil, err
}
return r.Topics, nil
}
// PartitionOffset fetches the available offset from a partition.
func (b *Broker) PartitionOffset(
replicaID int32,
topic string,
partition int32,
time int64,
) (int64, error) {
req := &sarama.OffsetRequest{}
if replicaID != noID {
req.SetReplicaID(replicaID)
}
req.AddBlock(topic, partition, time, 1)
resp, err := b.broker.GetAvailableOffsets(req)
if err != nil {
return -1, err
}
block := resp.GetBlock(topic, partition)
if len(block.Offsets) == 0 {
return -1, nil
}
return block.Offsets[0], nil
}
// ListGroups lists all groups managed by the broker. Other consumer
// groups might be managed by other brokers.
func (b *Broker) ListGroups() ([]string, error) {
resp, err := b.broker.ListGroups(&sarama.ListGroupsRequest{})
if err != nil {
return nil, err
}
if resp.Err != sarama.ErrNoError {
return nil, resp.Err
}
if len(resp.Groups) == 0 {
return nil, nil
}
groups := make([]string, 0, len(resp.Groups))
for name := range resp.Groups {
groups = append(groups, name)
}
return groups, nil
}
// DescribeGroups fetches group details from broker.
func (b *Broker) DescribeGroups(
queryGroups []string,
) (map[string]GroupDescription, error) {
requ := &sarama.DescribeGroupsRequest{Groups: queryGroups}
resp, err := b.broker.DescribeGroups(requ)
if err != nil {
return nil, err
}
if len(resp.Groups) == 0 {
return nil, nil
}
groups := map[string]GroupDescription{}
for _, descr := range resp.Groups {
if len(descr.Members) == 0 {
groups[descr.GroupId] = GroupDescription{}
continue
}
members := map[string]MemberDescription{}
for memberID, memberDescr := range descr.Members {
assignment, err := memberDescr.GetMemberAssignment()
if err != nil {
members[memberID] = MemberDescription{
ClientID: memberDescr.ClientId,
ClientHost: memberDescr.ClientHost,
Err: err,
}
continue
}
members[memberID] = MemberDescription{
ClientID: memberDescr.ClientId,
ClientHost: memberDescr.ClientHost,
Topics: assignment.Topics,
}
}
groups[descr.GroupId] = GroupDescription{Members: members}
}
return groups, nil
}
func (b *Broker) FetchGroupOffsets(group string) (*sarama.OffsetFetchResponse, error) {
requ := &sarama.OffsetFetchRequest{
ConsumerGroup: group,
Version: 1,
}
return b.broker.FetchOffset(requ)
}
// ID returns the broker or -1 if the broker id is unknown.
func (b *Broker) ID() int32 {
if b.id == noID {
return b.broker.ID()
}
return b.id
}
func queryMetadataWithRetry(
b *sarama.Broker,
cfg *sarama.Config,
topics []string,
) (r *sarama.MetadataResponse, err error) {
err = withRetry(b, cfg, func() (e error) {
requ := &sarama.MetadataRequest{Topics: topics}
r, e = b.GetMetadata(requ)
return
})
return
}
func closeBroker(b *sarama.Broker) {
if ok, _ := b.Connected(); ok {
b.Close()
}
}
func withRetry(
b *sarama.Broker,
cfg *sarama.Config,
f func() error,
) error {
var err error
for max := 0; max < cfg.Metadata.Retry.Max; max++ {
if ok, _ := b.Connected(); !ok {
if err = b.Open(cfg); err == nil {
err = f()
}
} else {
err = f()
}
if err == nil {
return nil
}
retry, reconnect := checkRetryQuery(err)
if !retry {
return err
}
time.Sleep(cfg.Metadata.Retry.Backoff)
if reconnect {
closeBroker(b)
}
}
return err
}
func checkRetryQuery(err error) (retry, reconnect bool) {
if err == nil {
return false, false
}
if err == io.EOF {
return true, true
}
k, ok := err.(sarama.KError)
if !ok {
return false, false
}
switch k {
case sarama.ErrLeaderNotAvailable, sarama.ErrReplicaNotAvailable,
sarama.ErrOffsetsLoadInProgress, sarama.ErrRebalanceInProgress:
return true, false
case sarama.ErrRequestTimedOut, sarama.ErrBrokerNotAvailable,
sarama.ErrNetworkException:
return true, true
}
return false, false
}
func findMatchingBroker(
addr string,
brokers []*sarama.Broker,
) *sarama.Broker {
lst := brokerAddresses(brokers)
if idx, found := findMatchingAddress(addr, lst); found {
return brokers[idx]
}
return nil
}
func findMatchingAddress(
addr string,
brokers []string,
) (int, bool) {
debugf("Try to match broker to: %v", addr)
// compare connection address to list of broker addresses
if i, found := indexOf(addr, brokers); found {
return i, true
}
// get connection 'port'
_, port, err := net.SplitHostPort(addr)
if err != nil || port == "" {
port = "9092"
}
// lookup local machines ips for comparing with broker addresses
localIPs, err := common.LocalIPAddrs()
if err != nil || len(localIPs) == 0 {
return -1, false
}
debugf("local machine ips: %v", localIPs)
// try to find broker by comparing the fqdn for each known ip to list of
// brokers
localHosts := lookupHosts(localIPs)
debugf("local machine addresses: %v", localHosts)
for _, host := range localHosts {
debugf("try to match with fqdn: %v (%v)", host, port)
if i, found := indexOf(net.JoinHostPort(host, port), brokers); found {
return i, true
}
}
// try to find broker id by comparing the machines local hostname to
// broker hostnames in metadata
if host, err := os.Hostname(); err == nil {
debugf("try to match with hostname only: %v (%v)", host, port)
tmp := net.JoinHostPort(strings.ToLower(host), port)
if i, found := indexOf(tmp, brokers); found {
return i, true
}
}
// lookup ips for all brokers
debugf("match by ips")
for i, b := range brokers {
debugf("test broker address: %v", b)
bh, bp, err := net.SplitHostPort(b)
if err != nil {
continue
}
// port numbers do not match
if bp != port {
continue
}
// lookup all ips for brokers host:
ips, err := net.LookupIP(bh)
debugf("broker %v ips: %v, %v", bh, ips, err)
if err != nil {
continue
}
debugf("broker (%v) ips: %v", bh, ips)
// check if ip is known
if anyIPsMatch(ips, localIPs) {
return i, true
}
}
return -1, false
}
func lookupHosts(ips []net.IP) []string {
set := map[string]struct{}{}
for _, ip := range ips {
txt, err := ip.MarshalText()
if err != nil {
continue
}
hosts, err := net.LookupAddr(string(txt))
debugf("lookup %v => %v, %v", string(txt), hosts, err)
if err != nil {
continue
}
for _, host := range hosts {
h := strings.ToLower(strings.TrimSuffix(host, "."))
set[h] = struct{}{}
}
}
hosts := make([]string, 0, len(set))
for host := range set {
hosts = append(hosts, host)
}
return hosts
}
func anyIPsMatch(as, bs []net.IP) bool {
for _, a := range as {
for _, b := range bs {
if bytes.Equal(a, b) {
return true
}
}
}
return false
}
func brokerAddresses(brokers []*sarama.Broker) []string {
addresses := make([]string, len(brokers))
for i, b := range brokers {
addresses[i] = brokerAddress(b)
}
return addresses
}
func brokerAddress(b *sarama.Broker) string {
return strings.ToLower(b.Addr())
}
func indexOf(s string, lst []string) (int, bool) {
for i, v := range lst {
if s == v {
return i, true
}
}
return -1, false
}