private static IStopable TrySubscribe(AppArguments appArguments, Regex filter, StreamWriter outputWriter)
{
Console.WriteLine("Subscribing...");
try
{
var settings = new RabbitMqSubscriptionSettings
{
ConnectionString = appArguments.ConnectionString,
ExchangeName = appArguments.ExchangeName,
QueueName = $"{appArguments.ExchangeName}.RabbitMqReader-{Guid.NewGuid()}",
IsDurable = false,
ReconnectionsCountToAlarm = -1,
ReconnectionDelay = TimeSpan.FromSeconds(5)
};
var subscriber = new RabbitMqSubscriber <object>(
settings,
new DefaultErrorHandlingStrategy(new LogToConsole(), settings))
.CreateDefaultBinding()
.SetLogger(new LogToConsole())
.SetMessageDeserializer(GetDeserializer(appArguments.MessageFormat))
.SetMessageReadStrategy(new MessageReadWithTemporaryQueueStrategy())
.Subscribe(
message =>
{
var userMessage = JsonConvert.SerializeObject(message, Formatting.Indented);
if (filter != null)
{
if (!filter.IsMatch(userMessage))
{
return(Task.CompletedTask);
}
}
Console.WriteLine(userMessage);
outputWriter?.WriteLine(userMessage);
if (appArguments.MessageSeparator != null)
{
Console.WriteLine(appArguments.MessageSeparator);
outputWriter?.WriteLine(appArguments.MessageSeparator);
}
return(Task.CompletedTask);
})
.Start();
Console.WriteLine("Subscriber is started");
return(subscriber);
}
catch (Exception e)
{
Console.WriteLine($"Failed to subscribe: {e.Message}");
return(null);
}
}
private static Regex TryCreateFilter(AppArguments appArguments)
{
if (appArguments.Filter == null)
{
return(null);
}
Console.WriteLine($"Filter: \"{appArguments.Filter}\"");
return(new Regex(appArguments.Filter, RegexOptions.Compiled));
}
private static StreamWriter TryGetOutputWriter(AppArguments appArguments)
{
if (string.IsNullOrWhiteSpace(appArguments.OutputFilePath))
{
return(null);
}
var fileStream = File.Open(
appArguments.OutputFilePath,
appArguments.AppendOutput ? FileMode.Append : FileMode.Create,
FileAccess.Write,
FileShare.Read);
return(new StreamWriter(fileStream, Encoding.UTF8, bufferSize: 16, leaveOpen: false));
}
