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kafka_client.go
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kafka_client.go
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package main
import (
"fmt"
"log"
"os/exec"
"regexp"
"strconv"
"strings"
)
// KafkaManagingClient does client stuff.
type KafkaManagingClient struct {
Zookeeper string
TopicScript string
ConfigScript string
}
func (client *KafkaManagingClient) alterTopicPartitions(name string, partitions int) error {
log.Printf("Update partitions count for topic '%s' to %d", name, partitions)
cmd := exec.Command(
client.TopicScript,
"--zookeeper", client.Zookeeper,
"--alter", "--topic", name,
"--partitions", strconv.Itoa(partitions))
return execKafkaCommand(cmd, "Adding partitions succeeded")
}
func (client *KafkaManagingClient) alterTopicConfig(name string, conf *KafkaTopicInfo) error {
var params = []string{
"--zookeeper", client.Zookeeper,
"--entity-type", "topics",
"--entity-name", name,
"--alter",
}
confOpts := conf.alterTopicConfigOpts()
params = append(params, confOpts...)
log.Printf("Will update configs for topic %s: %v", name, confOpts)
cmd := exec.Command(client.ConfigScript, params...)
return execKafkaCommand(cmd, "Completed Updating config for entity: topic")
}
func (client *KafkaManagingClient) deleteTopic(name string) error {
cmd := exec.Command(
client.TopicScript,
"--zookeeper", client.Zookeeper,
"--delete", "--topic", name)
return execKafkaCommand(cmd, "marked for deletion")
}
func (client *KafkaManagingClient) createTopic(name string, conf *KafkaTopicInfo) error {
var params = []string{
"--zookeeper", client.Zookeeper,
"--create", "--topic", name,
"--partitions", strconv.Itoa(conf.PartitionsCount),
"--replication-factor", strconv.Itoa(conf.ReplicationFactor),
}
confOpts := conf.createTopicConfigOpts()
params = append(params, confOpts...)
log.Printf("[DEBUG] Will execute %v", params)
cmd := exec.Command(client.TopicScript, params...)
out, err := cmd.Output()
if err != nil {
kafkaError := readError(string(out))
if kafkaError != nil {
return kafkaError
}
return err
}
strOut := strings.TrimSpace(string(out))
if strOut == fmt.Sprintf("Created topic \"%s\".", name) {
return nil
}
return fmt.Errorf("Unable to parse results from kafka, there is maybe something wrong: %s", strOut)
}
func (client *KafkaManagingClient) describeTopic(name string) (*KafkaTopicInfo, error) {
cmd := exec.Command(client.TopicScript, "--zookeeper", client.Zookeeper, "--describe", "--topic", name)
out, err := cmd.Output()
if err != nil {
return nil, err
}
strOut := strings.TrimSpace(string(out[:len(out)]))
//does not exist
if strOut == "" {
fmt.Printf("Topic not found %s", name)
return nil, nil
}
return readTopicInfo(strOut)
}
func readError(txt string) error {
errorR, _ := regexp.Compile("(?m:^Error .+)")
err := strings.TrimSpace(errorR.FindString(txt))
if err == "" {
return nil
}
return fmt.Errorf("%s", err)
}
func readTopicInfo(txt string) (*KafkaTopicInfo, error) {
partsR, _ := regexp.Compile("PartitionCount:(\\d+).+ReplicationFactor:(\\d+).+Configs:\\s*([^\\s]+)?")
pRes := partsR.FindStringSubmatch(txt)
if len(pRes) != 4 {
return nil, fmt.Errorf("Unable to determine topic's partitions count (Unexpected format)")
}
pCount, pcErr := strconv.Atoi(pRes[1])
if pcErr != nil {
return nil, fmt.Errorf("Unable to read topic's partition count: " + pcErr.Error())
}
rCount, rErr := strconv.Atoi(pRes[2])
if rErr != nil {
return nil, fmt.Errorf("Unable to read topic's partition count: " + rErr.Error())
}
// Read config options
confOpts := make(map[string]string)
for _, e := range strings.Split(pRes[3], ",") {
if !strings.Contains(e, "=") {
continue
}
ps := strings.SplitN(e, "=", 2)
confOpts[ps[0]] = ps[1]
}
info := &KafkaTopicInfo{
PartitionsCount: pCount,
ReplicationFactor: rCount,
CleanupPolicy: getOrDefaultStr(confOpts, "cleanup.policy", ""),
RetentionBytes: getOrDefaultInt(confOpts, "retention.bytes", -1),
RetentionMs: getOrDefaultInt(confOpts, "retention.ms", -1),
SegmentMs: getOrDefaultInt(confOpts, "segment.ms", -1),
SegmentBytes: getOrDefaultInt(confOpts, "segment.bytes", -1),
MinInsyncReplicas: getOrDefaultInt(confOpts, "min.insync.replicas", -1),
}
return info, nil
}
func execKafkaCommand(cmd *exec.Cmd, successIfPresent string) error {
out, err := cmd.Output()
if err != nil {
kafkaError := readError(string(out))
if kafkaError != nil {
return kafkaError
}
return err
}
strOut := strings.TrimSpace(string(out))
if strings.Contains(strOut, successIfPresent) {
return nil
}
return fmt.Errorf("Unable to execute command '%v': %s", cmd.Args, strOut)
}
func getOrDefaultStr(m map[string]string, key string, def string) string {
if v, ok := m[key]; ok {
return v
}
return def
}
func getOrDefaultInt(m map[string]string, key string, def int64) int64 {
if v, ok := m[key]; ok {
if i, pok := strconv.ParseInt(v, 10, 0); pok == nil {
return i
}
}
return def
}