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avro_specific_producer_example.go
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avro_specific_producer_example.go
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// Example function-based Apache Kafka producer
package main
/**
* Copyright 2022 Confluent Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
import (
"fmt"
"os"
"github.com/confluentinc/confluent-kafka-go/kafka"
"github.com/confluentinc/confluent-kafka-go/schemaregistry"
"github.com/confluentinc/confluent-kafka-go/schemaregistry/serde"
"github.com/confluentinc/confluent-kafka-go/schemaregistry/serde/avro"
)
func main() {
if len(os.Args) != 4 {
fmt.Fprintf(os.Stderr, "Usage: %s <bootstrap-servers> <schema-registry> <topic>\n",
os.Args[0])
os.Exit(1)
}
bootstrapServers := os.Args[1]
url := os.Args[2]
topic := os.Args[3]
p, err := kafka.NewProducer(&kafka.ConfigMap{"bootstrap.servers": bootstrapServers})
if err != nil {
fmt.Printf("Failed to create producer: %s\n", err)
os.Exit(1)
}
fmt.Printf("Created Producer %v\n", p)
client, err := schemaregistry.NewClient(schemaregistry.NewConfig(url))
if err != nil {
fmt.Printf("Failed to create schema registry client: %s\n", err)
os.Exit(1)
}
ser, err := avro.NewSpecificSerializer(client, serde.ValueSerde, avro.NewSerializerConfig())
if err != nil {
fmt.Printf("Failed to create serializer: %s\n", err)
os.Exit(1)
}
// Optional delivery channel, if not specified the Producer object's
// .Events channel is used.
deliveryChan := make(chan kafka.Event)
value := User{
Name: "First user",
Favorite_number: 42,
Favorite_color: "blue",
}
payload, err := ser.Serialize(topic, &value)
if err != nil {
fmt.Printf("Failed to serialize payload: %s\n", err)
os.Exit(1)
}
err = p.Produce(&kafka.Message{
TopicPartition: kafka.TopicPartition{Topic: &topic, Partition: kafka.PartitionAny},
Value: payload,
Headers: []kafka.Header{{Key: "myTestHeader", Value: []byte("header values are binary")}},
}, deliveryChan)
if err != nil {
fmt.Printf("Produce failed: %v\n", err)
os.Exit(1)
}
e := <-deliveryChan
m := e.(*kafka.Message)
if m.TopicPartition.Error != nil {
fmt.Printf("Delivery failed: %v\n", m.TopicPartition.Error)
} else {
fmt.Printf("Delivered message to topic %s [%d] at offset %v\n",
*m.TopicPartition.Topic, m.TopicPartition.Partition, m.TopicPartition.Offset)
}
close(deliveryChan)
}