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topic-state.go
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topic-state.go
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// This binary is to generate the provided kafka cluster's topic state and translate all topics
// into a terraform kafka_topic resource for use with the terraform-provider-kafka module
//
// Author: Yared Mekuria<[email protected]>
package main
import (
"bytes"
"context"
"fmt"
"os"
"sort"
"text/template"
"time"
"github.com/confluentinc/confluent-kafka-go/kafka"
)
var GitCommit string
//Struct to provide to golang template
type tfTopic struct {
Name string
ReplFactor int
Partitions int
DynConfig map[string]string
}
//Function to sort all topics in alphabetical order
func sortTopics(s []string) []string {
var r []string
sort.Strings(s)
for _, str := range s {
//Check if string is empty or starts with "__".
if str != "" && !(len(str) >= len("__") && str[0:len("__")] == "__") {
r = append(r, str)
}
}
return r
}
func ReplFactor(c *kafka.TopicMetadata) int {
var r int
//Find replication factor of topic by counting number of partitions and assigning greatest.
//This is literally how Kafka provided tools do it internally
for _, t := range c.Partitions {
if r < len(t.Replicas) {
r = len(t.Replicas)
}
}
return r
}
//Golang template and rendering, provided a pointer to the populated struct. Outputs to stdout.
func tmpl(data *tfTopic) string {
var tpl bytes.Buffer
t, _ := template.New("").Parse(`resource "kafka_topic" "{{.Name}}" {
name = "{{.Name}}"
replication_factor = {{.ReplFactor}}
partitions = {{.Partitions}}
config = {
{{- range $k, $v := .DynConfig }}
"{{ $k }}" = "{{ $v }}"
{{- end }}
}
}
`)
t.Execute(&tpl, data)
return tpl.String()
}
func getTopics(ac *kafka.AdminClient) []string {
//Get list of all topics and number of partitions
topicList, err := ac.GetMetadata(nil, true, 20000)
if err != nil {
fmt.Printf("Failed to GetMetadata: %s\n", err)
os.Exit(1)
}
t := make([]string, len(topicList.Topics))
for _, res := range topicList.Topics {
t = append(t, res.Topic)
}
topics := sortTopics(t)
return topics
}
func getTopicMetadata(ac *kafka.AdminClient, t string) string {
var topicData *tfTopic
ctx, cancel := context.WithCancel(context.Background())
defer cancel()
dur, _ := time.ParseDuration("20s")
resourceType, _ := kafka.ResourceTypeFromString("Topic")
results, err := ac.DescribeConfigs(ctx,
[]kafka.ConfigResource{{Type: resourceType, Name: t}},
kafka.SetAdminRequestTimeout(dur))
if err != nil {
fmt.Printf("Failed to DescribeConfigs(%s, %s): %s\n",
resourceType, t, err)
os.Exit(1)
}
for _, result := range results {
config := make(map[string]string)
topicMeta, _ := ac.GetMetadata(&result.Name, false, 20000)
topicInfo := topicMeta.Topics[result.Name]
for _, entry := range result.Config {
if int(entry.Source) == 1 {
config[entry.Name] = entry.Value
}
}
topicData = &tfTopic{
Name: result.Name,
ReplFactor: ReplFactor(&topicInfo),
Partitions: len(topicInfo.Partitions),
DynConfig: config,
}
}
return tmpl(topicData)
}
func main() {
//Error handling in case an argument isnt provided.
if len(os.Args) != 2 {
fmt.Fprintf(os.Stderr,
"Kafka Topics Terraform Sync\n"+
"Version: %s"+
"\n"+
"Usage: %s <kafka-server:port>",
GitCommit,
os.Args[0])
os.Exit(2)
}
cluster := os.Args[1]
//Create AdminClient
ac, err := kafka.NewAdminClient(&kafka.ConfigMap{"bootstrap.servers": cluster})
if err != nil {
fmt.Printf("Failed to create Admin client: %s\n", err)
os.Exit(1)
}
topics := getTopics(ac)
for _, t := range topics {
fmt.Print(getTopicMetadata(ac, t))
}
}