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* feat: add preBatch feature * chore: fix test * chore: add integration test * chore: add preBatch unit test * chore: add consumer base fetch err unit test * chore: EOF log from error to warn * chore: fix transactionalRetry integration test flakyness * chore: dummy commit for pipeline * chore: fix modules * chore: fix lint * chore: readme typo fix
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A.Samet İleri
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Dec 18, 2023
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,90 @@ | ||
| package main | ||
|
|
||
| import ( | ||
| "encoding/json" | ||
| "fmt" | ||
| "github.com/Trendyol/kafka-konsumer/v2" | ||
| "os" | ||
| "os/signal" | ||
| "time" | ||
| ) | ||
|
|
||
| func main() { | ||
| consumerCfg := &kafka.ConsumerConfig{ | ||
| Reader: kafka.ReaderConfig{ | ||
| Brokers: []string{"localhost:29092"}, | ||
| Topic: "standart-topic", | ||
| GroupID: "standart-cg", | ||
| }, | ||
| BatchConfiguration: &kafka.BatchConfiguration{ | ||
| MessageGroupLimit: 1000, | ||
| BatchConsumeFn: batchConsumeFn, | ||
| PreBatchFn: preBatch, | ||
| }, | ||
| RetryEnabled: true, | ||
| RetryConfiguration: kafka.RetryConfiguration{ | ||
| Brokers: []string{"localhost:29092"}, | ||
| Topic: "retry-topic", | ||
| StartTimeCron: "*/1 * * * *", | ||
| WorkDuration: 50 * time.Second, | ||
| MaxRetry: 3, | ||
| }, | ||
| MessageGroupDuration: time.Second, | ||
| } | ||
|
|
||
| consumer, _ := kafka.NewConsumer(consumerCfg) | ||
| defer consumer.Stop() | ||
|
|
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| consumer.Consume() | ||
|
|
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| fmt.Println("Consumer started...!") | ||
| c := make(chan os.Signal, 1) | ||
| signal.Notify(c, os.Interrupt) | ||
| <-c | ||
| } | ||
|
|
||
| type MessageValue struct { | ||
| Id int `json:"id"` | ||
| Version int `json:"version"` | ||
| Payload string `json:"payload"` | ||
| KafkaMessage *kafka.Message `json:"-"` | ||
| } | ||
|
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| func preBatch(messages []*kafka.Message) []*kafka.Message { | ||
| latestMessageById := getLatestMessageByID(messages) | ||
|
|
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| return convertLatestMessageList(latestMessageById) | ||
| } | ||
|
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| func getLatestMessageByID(messages []*kafka.Message) map[int]MessageValue { | ||
| latestMessageById := make(map[int]MessageValue, len(messages)) | ||
| for i := range messages { | ||
| var mv MessageValue | ||
| json.Unmarshal(messages[i].Value, &mv) | ||
| mv.KafkaMessage = messages[i] | ||
|
|
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| val, ok := latestMessageById[mv.Id] | ||
| if !ok { | ||
| latestMessageById[mv.Id] = mv | ||
| } else if mv.Version > val.Version { | ||
| latestMessageById[mv.Id] = mv | ||
| } | ||
| } | ||
| return latestMessageById | ||
| } | ||
|
|
||
| func convertLatestMessageList(latestMessageById map[int]MessageValue) []*kafka.Message { | ||
| result := make([]*kafka.Message, 0, len(latestMessageById)) | ||
| for _, latestMessage := range latestMessageById { | ||
| result = append(result, latestMessage.KafkaMessage) | ||
| } | ||
| return result | ||
| } | ||
|
|
||
| // In order to load topic with data, use: | ||
| // kafka-console-producer --broker-list localhost:29092 --topic standart-topic < examples/with-kafka-batch-consumer-with-prebatch/testdata/messages.txt | ||
| func batchConsumeFn(messages []*kafka.Message) error { | ||
| fmt.Printf("length of %d messages, first message value is %s \n", len(messages), messages[0].Value) | ||
|
|
||
| return nil | ||
| } |
5 changes: 5 additions & 0 deletions
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examples/with-kafka-batch-consumer-with-prebatch/testdata/messages.txt
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,5 @@ | ||
| { "id": 1, "version": 1, "payload": "foo" } | ||
| { "id": 1, "version": 2, "payload": "foobar" } | ||
| { "id": 1, "version": 3, "payload": "foobarfoobar" } | ||
| { "id": 2, "version": 1, "payload": "x" } | ||
| { "id": 3, "version": 2, "payload": "y" } |
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