Created
April 30, 2020 18:52
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Kafka consumer for log entries
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class Program | |
{ | |
static void Main(string[] args) | |
{ | |
Console.WriteLine($"Started consumer, Ctrl-C to stop consuming"); | |
var cts = new CancellationTokenSource(); | |
Console.CancelKeyPress += (_, e) => { | |
e.Cancel = true; // prevent the process from terminating. | |
cts.Cancel(); | |
}; | |
SubscribeToEvents(cts.Token); | |
} | |
private static void SubscribeToEvents(CancellationToken cancellationToken) | |
{ | |
var config = new ConsumerConfig | |
{ | |
BootstrapServers = "localhost:9092", | |
GroupId = "csharp-consumer", | |
EnableAutoCommit = false, | |
StatisticsIntervalMs = 5000, | |
SessionTimeoutMs = 6000, | |
AutoOffsetReset = AutoOffsetReset.Earliest, | |
EnablePartitionEof = true | |
}; | |
const int commitPeriod = 5; | |
using var consumer = new ConsumerBuilder<Ignore, string>(config) | |
.SetErrorHandler((_, e) => Console.WriteLine($"Error: {e.Reason}")) | |
.Build(); | |
consumer.Subscribe("log-entry-topic"); | |
try | |
{ | |
while (true) | |
{ | |
var consumeResult = consumer.Consume(cancellationToken); | |
if (consumeResult.IsPartitionEOF) | |
{ | |
Console.WriteLine( | |
$"Reached end of topic {consumeResult.Topic}, partition {consumeResult.Partition}, offset {consumeResult.Offset}."); | |
continue; | |
} | |
Console.WriteLine( | |
$"Received message at {consumeResult.TopicPartitionOffset}: \n{consumeResult.Message.Value}"); | |
if (consumeResult.Offset % commitPeriod == 0) | |
{ | |
consumer.Commit(consumeResult); | |
} | |
} | |
} | |
catch (OperationCanceledException) | |
{ | |
Console.WriteLine("Closing consumer."); | |
} | |
catch (Exception e) | |
{ | |
Console.WriteLine($"Message: {e.Message}"); | |
if (e is KafkaException ke) | |
Console.WriteLine($"Reason: {ke.Error.Reason}"); | |
if (e is ConsumeException ce) | |
Console.WriteLine($"Reason: {ce.Error.Reason}"); | |
} | |
finally | |
{ | |
consumer.Close(); | |
} | |
} | |
} |
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