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Program.cs
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Program.cs
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// Copyright 2018 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.
//
// Refer to LICENSE for more information.
using Avro.Generic;
using Confluent.Kafka;
using Confluent.Kafka.SyncOverAsync;
using Confluent.SchemaRegistry.Serdes;
using Confluent.SchemaRegistry;
using System;
using System.Collections.Generic;
using System.IO;
using System.Threading;
using System.Threading.Tasks;
namespace AvroBlogExample
{
/// <summary>
/// Complete source for the examples programs presented in the blog post:
/// https://www.confluent.io/blog/decoupling-systems-with-apache-kafka-schema-registry-and-avro/
/// </summary>
class Program
{
async static Task ProduceGeneric(string bootstrapServers, string schemaRegistryUrl)
{
using (var schemaRegistry = new CachedSchemaRegistryClient(new SchemaRegistryConfig { Url = schemaRegistryUrl }))
using (var producer =
new ProducerBuilder<Null, GenericRecord>(new ProducerConfig { BootstrapServers = bootstrapServers })
.SetValueSerializer(new AvroSerializer<GenericRecord>(schemaRegistry))
.Build())
{
var logLevelSchema = (Avro.EnumSchema)Avro.Schema.Parse(
File.ReadAllText("LogLevel.asvc"));
var logMessageSchema = (Avro.RecordSchema)Avro.Schema
.Parse(File.ReadAllText("LogMessage.V1.asvc")
.Replace(
"MessageTypes.LogLevel",
File.ReadAllText("LogLevel.asvc")));
var record = new GenericRecord(logMessageSchema);
record.Add("IP", "127.0.0.1");
record.Add("Message", "a test log message");
record.Add("Severity", new GenericEnum(logLevelSchema, "Error"));
await producer
.ProduceAsync("log-messages", new Message<Null, GenericRecord> { Value = record })
.ContinueWith(task => Console.WriteLine(
task.IsFaulted
? $"error producing message: {task.Exception.Message}"
: $"produced to: {task.Result.TopicPartitionOffset}"));
producer.Flush(TimeSpan.FromSeconds(30));
}
}
async static Task ProduceSpecific(string bootstrapServers, string schemaRegistryUrl)
{
using (var schemaRegistry = new CachedSchemaRegistryClient(new SchemaRegistryConfig { Url = schemaRegistryUrl }))
using (var producer =
new ProducerBuilder<Null, MessageTypes.LogMessage>(new ProducerConfig { BootstrapServers = bootstrapServers })
.SetValueSerializer(new AvroSerializer<MessageTypes.LogMessage>(schemaRegistry))
.Build())
{
await producer.ProduceAsync("log-messages",
new Message<Null, MessageTypes.LogMessage>
{
Value = new MessageTypes.LogMessage
{
IP = "192.168.0.1",
Message = "a test message 2",
Severity = MessageTypes.LogLevel.Info,
Tags = new Dictionary<string, string> { { "location", "CA" } }
}
});
producer.Flush(TimeSpan.FromSeconds(30));
}
}
static void ConsumeSpecific(string bootstrapServers, string schemaRegistryUrl)
{
CancellationTokenSource cts = new CancellationTokenSource();
Console.CancelKeyPress += (_, e) => {
e.Cancel = true; // prevent the process from terminating.
cts.Cancel();
};
var consumerConfig = new ConsumerConfig
{
GroupId = Guid.NewGuid().ToString(),
BootstrapServers = bootstrapServers,
AutoOffsetReset = AutoOffsetReset.Earliest
};
using (var schemaRegistry = new CachedSchemaRegistryClient(new SchemaRegistryConfig { Url = schemaRegistryUrl }))
using (var consumer =
new ConsumerBuilder<Null, MessageTypes.LogMessage>(consumerConfig)
.SetValueDeserializer(new AvroDeserializer<MessageTypes.LogMessage>(schemaRegistry).AsSyncOverAsync())
.Build())
{
consumer.Subscribe("log-messages");
try
{
while (true)
{
try
{
var consumeResult = consumer.Consume(cts.Token);
Console.WriteLine(
consumeResult.Message.Timestamp.UtcDateTime.ToString("yyyy-MM-dd HH:mm:ss")
+ $": [{consumeResult.Message.Value.Severity}] {consumeResult.Message.Value.Message}");
}
catch (ConsumeException e)
{
Console.WriteLine($"an error occured: {e.Error.Reason}");
}
}
}
catch (OperationCanceledException)
{
// commit final offsets and leave the group.
consumer.Close();
}
}
}
private static void PrintUsage()
=> Console.WriteLine("Usage: .. <generic-produce|specific-produce|consume> <bootstrap-servers> <schema-registry-url>");
static async Task Main(string[] args)
{
if (args.Length != 3)
{
PrintUsage();
return;
}
var mode = args[0];
var bootstrapServers = args[1];
var schemaRegistryUrl = args[2];
switch (mode)
{
case "generic-produce":
await ProduceGeneric(bootstrapServers, schemaRegistryUrl);
break;
case "specific-produce":
await ProduceSpecific(bootstrapServers, schemaRegistryUrl);
break;
case "consume":
ConsumeSpecific(bootstrapServers, schemaRegistryUrl);
break;
default:
PrintUsage();
break;
}
}
}
}