public IEnumerable<RecoveryMessage> GetMessagesFromQueue(IQueueOptions options)
{
using (var connection = RabbitConnection.FromOptions(options))
using (var channel = connection.CreateModel())
{
try
{
channel.QueueDeclarePassive(options.ErrorQueueName);
}
catch (OperationInterruptedException exception)
{
_log.ErrorFormat("Error Occurred Getting a message from queue because {0}", exception, exception.Message);
yield break;
}
var count = 0;
while (count++ < options.MaxNumberOfMessagesToRetrieve)
{
var basicGetResult = channel.BasicGet(options.ErrorQueueName, noAck: options.RequireHandshake);
if (basicGetResult == null) break; // no more messages on the queue
var properties = new MessageProperties(basicGetResult.BasicProperties);
var info = new MessageReceivedInfo(
"recoveries",
basicGetResult.DeliveryTag,
basicGetResult.Redelivered,
basicGetResult.Exchange,
basicGetResult.RoutingKey,
options.ErrorQueueName);
yield return new RecoveryMessage(Encoding.UTF8.GetString(basicGetResult.Body), properties, info);
}
}
}
public void Handle(IQueueOptions options)
{
var results = new StringBuilder();
var succeeded = true;
Func<string, Action> messsage = m => () =>
{
results.AppendLine(m);
succeeded = false;
};
try
{
Delete(options);
ErrorDump(options);
Purge(options);
Retry(options);
}
catch (EasyNetQException ex)
{
Log.ErrorFormat("Operation Failed in Recovery Service because of {0}", ex, ex.Message);
}
if (succeeded)
return;
Log.Error("Operation failed");
Log.Error(results.ToString());
}
public void Write(IEnumerable<RecoveryMessage> messages, IQueueOptions options)
{
var count = 0;
foreach (var message in messages)
{
var uniqueFileName = SanitiseQueueName(options.ErrorQueueName) + "." + count.ToString();
var bodyPath = Path.Combine(options.MessageFilePath, uniqueFileName + ".message.txt");
var propertiesPath = Path.Combine(options.MessageFilePath, uniqueFileName + ".properties.txt");
var infoPath = Path.Combine(options.MessageFilePath, uniqueFileName + ".info.txt");
if (File.Exists(bodyPath))
Log.InfoFormat("Overwriting existing messsage file: {0}", bodyPath);
try
{
File.WriteAllText(bodyPath, message.Body);
File.WriteAllText(propertiesPath, Newtonsoft.Json.JsonConvert.SerializeObject(message.Properties));
File.WriteAllText(infoPath, Newtonsoft.Json.JsonConvert.SerializeObject(message.Info));
}
catch (DirectoryNotFoundException)
{
throw new EasyNetQException(string.Format("Directory '{0}' does not exist", options.MessageFilePath));
}
count++;
}
}
public void RepublishError(Error error, IQueueOptions options)
{
using (var connection = RabbitConnection.FromOptions(options))
using (var model = connection.CreateModel())
{
try
{
if (error.Exchange != string.Empty)
{
model.ExchangeDeclarePassive(error.Exchange);
}
var properties = model.CreateBasicProperties();
error.BasicProperties.CopyTo(properties);
var body = Encoding.UTF8.GetBytes(error.Message);
model.BasicPublish(error.Exchange, error.RoutingKey, properties, body);
}
catch (OperationInterruptedException)
{
Log.ErrorFormat("The exchange, '{0}', described in the error message does not exist on '{1}', '{2}'",
error.Exchange, options.HostName, options.VirtualHost);
}
}
}
public IEnumerable<RecoveryMessage> ReadMessages(IQueueOptions options, string messageName)
{
if (!Directory.Exists(options.MessageFilePath))
{
Log.ErrorFormat("Directory '{0}' does not exist", options.MessageFilePath);
Log.InfoFormat("Creating Directory at '{0}'", options.MessageFilePath);
options.MessageFilePath.CreateDirectory();
Log.InfoFormat("Directory created at '{0}'", options.MessageFilePath);
}
var bodyPattern = (messageName ?? "*") + ".*.message.txt";
foreach (var file in Directory.GetFiles(options.MessageFilePath, bodyPattern))
{
const string messageTag = ".message.";
var directoryName = Path.GetDirectoryName(file);
var fileName = Path.GetFileName(file);
var propertiesFileName = Path.Combine(directoryName, fileName.Replace(messageTag, ".properties."));
var infoFileName = Path.Combine(directoryName, fileName.Replace(messageTag, ".info."));
var body = File.ReadAllText(file);
var propertiesJson = File.ReadAllText(propertiesFileName);
var properties = Newtonsoft.Json.JsonConvert.DeserializeObject<MessageProperties>(propertiesJson);
var infoJson = File.ReadAllText(infoFileName);
var info = Newtonsoft.Json.JsonConvert.DeserializeObject<MessageReceivedInfo>(infoJson);
yield return new RecoveryMessage(body, properties, info);
}
}
private void Dump(IQueueOptions options)
{
var count = 0;
_messageWriter.Write(WithEach(_queueRetreival.GetMessagesFromQueue(options), () => count++), options);
Log.InfoFormat("{0} Messages from queue '{1}'\r\noutput to directory '{2}'",
count, options.ErrorQueueName, options.MessageFilePath);
}
public void RetryErrors(IEnumerable<RecoveryMessage> rawErrorMessages, IQueueOptions options)
{
foreach (var rawErrorMessage in rawErrorMessages)
{
var error = _serializer.BytesToMessage<Error>(Encoding.UTF8.GetBytes(rawErrorMessage.Body));
RepublishError(error, options);
}
}
public IEventQueuer BuildQueueProvider(string queueName, IQueueOptions queueOptions)
{
if (queueOptions.ProviderType != this.Name)
{
throw new Exceptions.BadQueueProvider(this.Name, queueName);
}
return(this.BuildQueueInternal(queueName, queueOptions.ParseQueueOptions <TParsedOptions, TInstanceOptions, TQueueOptions>(options)));
}
public void PublishMessagesToQueue(IEnumerable<RecoveryMessage> messages, IQueueOptions options)
{
using (var connection = RabbitConnection.FromOptions(options))
using (var channel = connection.CreateModel())
{
foreach (var message in messages)
{
var body = Encoding.UTF8.GetBytes(message.Body);
var properties = new BasicProperties();
message.Properties.CopyTo(properties);
channel.BasicPublish(message.Info.Exchange, message.Info.RoutingKey, properties, body);
}
}
}
public IEnumerable<int> DeleteMessages(IQueueOptions options)
{
if (!Directory.Exists(options.MessageFilePath))
{
Log.ErrorFormat("Directory '{0}' does not exist", options.MessageFilePath);
Log.InfoFormat("Creating Directory at '{0}'", options.MessageFilePath);
options.MessageFilePath.CreateDirectory();
Log.InfoFormat("Directory created at '{0}'", options.MessageFilePath);
}
var count = 0;
foreach (var file in new DirectoryInfo(options.MessageFilePath).GetFiles())
{
file.Delete();
count++;
yield return count;
}
}
public static IConnection FromOptions(IQueueOptions options)
{
var connectionFactory = new ConnectionFactory
{
HostName = options.HostName,
VirtualHost = options.VirtualHost,
UserName = options.Username,
Password = options.Password
};
try
{
return connectionFactory.CreateConnection();
}
catch (BrokerUnreachableException)
{
throw new EasyNetQException(
string.Format("The broker at '{0}', VirtualHost '{1}', is unreachable. This message can also be caused by incorrect credentials.",
options.HostName, options.VirtualHost));
}
}
private IEventProvider GetProvider(IQueueOptions configuration, bool throwIfNotFound = true)
{
string providerTypeName = null;
if (!string.IsNullOrEmpty(configuration.ProviderType))
{
providerTypeName = configuration.ProviderType;
}
else if (!string.IsNullOrEmpty(configuration.ProviderName))
{
this.options.ParsedProviderInstances.TryGetValue(configuration.ProviderName, out var providersInstanceOptions);
if (providersInstanceOptions != null)
{
providerTypeName = providersInstanceOptions.Type;
}
else if (throwIfNotFound)
{
throw new Exceptions.BadProviderConfiguration(configuration.ProviderName, "Unable to find it in the configuration ");
}
}
else if (throwIfNotFound)
{
throw new Exceptions.BadQueueConfiguration(configuration.Name, "You must set either 'ProviderType or 'ProviderName' in event configuration.");
}
if (string.IsNullOrEmpty(providerTypeName))
{
return(null);
}
this.queueProviders.TryGetValue(providerTypeName, out var provider);
if (provider == null && throwIfNotFound)
{
throw new Exceptions.ProviderNotFound(providerTypeName);
}
return(provider);
}
public IEnumerable<uint> PurgeQueue(IQueueOptions options)
{
using (var connection = RabbitConnection.FromOptions(options))
using (var channel = connection.CreateModel())
{
uint count = 0;
try
{
var messages = channel.BasicGet(options.ErrorQueueName, true);
if (messages == null) yield break;
channel.QueueBind(options.ErrorQueueName, messages.Exchange,messages.RoutingKey);
count = messages.MessageCount;
channel.QueuePurge(options.ErrorQueueName);
}
catch (OperationInterruptedException exception)
{
Log.ErrorFormat("Error Occurred Getting a message from queue because {0}", exception, exception.Message);
yield break;
}
yield return count;
}
}
public IEnumerable<RecoveryMessage> ReadMessages(IQueueOptions options)
{
return ReadMessages(options, null);
}
public IEventQueuer GetQueuer(string queueName, IQueueOptions configuration)
{
return(this.GetProvider(configuration).BuildQueueProvider(queueName, configuration));
}
private void Retry(IQueueOptions options)
{
var count = 0;
_errorRetry.RetryErrors(
WithEach(
_messageReader.ReadMessages(options, options.ErrorQueueName),
() => count++),
options);
Log.InfoFormat("{0} Error messages from directory '{1}' republished",
count, options.MessageFilePath);
}
private void ErrorDump(IQueueOptions options)
{
Dump(options);
}
private void Purge(IQueueOptions options)
{
var count = 0;
var messages = WithEach(_errorPurge.PurgeQueue(options), () => count++).ToList();
Log.InfoFormat("{0}/{2} messages from Queue '{1}' have been Purged", count, options.ErrorQueueName, messages.Any() ? messages.Max() : 0);
}
private void Delete(IQueueOptions options)
{
var count = 0;
var files = WithEach(_errorDelete.DeleteMessages(options), () => count++).ToList();
Log.InfoFormat("{0}/{2} Error messages from directory '{1}' have been deleted", count, options.MessageFilePath, files.Any() ? files.Max() : 0);
}
public static TQueueOptions ParseQueueOptions <TParsedOptions, TInstanceOptions, TQueueOptions>(this IQueueOptions queueOptions, TParsedOptions options)
where TParsedOptions : class, IParsedOptions <TInstanceOptions, TQueueOptions>, new()
where TInstanceOptions : class, IProviderInstanceOptions, new()
where TQueueOptions : class, IQueueOptions, new()
{
if (!(queueOptions is TQueueOptions parsedQueueOptions))
{
parsedQueueOptions = new TQueueOptions
{
Name = queueOptions.Name,
ProviderName = queueOptions.ProviderName,
ProviderType = queueOptions.ProviderType
};
}
parsedQueueOptions.Compute <TParsedOptions, TInstanceOptions, TQueueOptions>(options);
return(parsedQueueOptions);
}
