public async Task Setup(string endpoint, int readsize, bool extraStats)
{
_endpoint = endpoint;
_readsize = readsize;
_extraStats = extraStats;
if (_connection.Settings.GossipSeeds == null || !_connection.Settings.GossipSeeds.Any())
{
throw new ArgumentException(
"Eventstore connection settings does not contain gossip seeds (even if single host call SetGossipSeedEndPoints and SetClusterGossipPort)");
}
var manager = new ProjectionsManager(_connection.Settings.Log,
new IPEndPoint(_connection.Settings.GossipSeeds[0].EndPoint.Address, _connection.Settings.ExternalGossipPort), TimeSpan.FromSeconds(5));
// We use this system projection - so enable it
await manager.EnableAsync("$by_event_type", _connection.Settings.DefaultUserCredentials).ConfigureAwait(false);
var discoveredEvents = _registry.GetMessageTypes().Where(x => typeof(IEvent).IsAssignableFrom(x)).ToList();
var stream = $"{_endpoint}.{Assembly.GetEntryAssembly().GetName().Version}";
// Link all events we are subscribing to to a stream
var functions =
discoveredEvents
.Select(eventType => $"'{eventType.AssemblyQualifiedName}': function(s,e) {{ linkTo('{stream}', e); }}")
.Aggregate((cur, next) => $"{cur},\n{next}");
var eventTypes =
discoveredEvents
.Select(eventType => $"'$et-{eventType.AssemblyQualifiedName}'")
.Aggregate((cur, next) => $"{cur},{next}");
var definition = $"fromStreams([{eventTypes}]).when(\n{{{functions}}}\n);";
try
{
var existing = await manager.GetQueryAsync(stream).ConfigureAwait(false);
if (existing != definition)
{
Logger.Fatal(
$"Projection [{stream}] already exists and is a different version! If you've upgraded your code don't forget to bump your app's version!");
throw new EndpointVersionException(
$"Projection [{stream}] already exists and is a different version! If you've upgraded your code don't forget to bump your app's version!");
}
}
catch (ProjectionCommandFailedException)
{
try
{
// Projection doesn't exist
await
manager.CreateContinuousAsync(stream, definition, _connection.Settings.DefaultUserCredentials)
.ConfigureAwait(false);
}
catch (ProjectionCommandConflictException)
{
}
}
}
static List <Type> GetMessageTypesHandledByThisEndpoint(MessageHandlerRegistry handlerRegistry, Conventions conventions)
{
var messageTypesHandled = handlerRegistry.GetMessageTypes() //get all potential messages
.Where(t => !conventions.IsInSystemConventionList(t)) //never auto-route system messages
.ToList();
return(messageTypesHandled);
}
static List <Type> GetHandledEvents(MessageHandlerRegistry handlerRegistry, Conventions conventions)
{
// get all potential messages
return(handlerRegistry.GetMessageTypes()
// never auto-route system messages and events
.Where(t => !conventions.IsInSystemConventionList(t) && conventions.IsEventType(t))
.ToList());
}
static List <Type> GetMessageTypesHandledByThisEndpoint(MessageHandlerRegistry handlerRegistry, Conventions conventions, SubscribeSettings settings)
{
var messageTypesHandled = handlerRegistry.GetMessageTypes() //get all potential messages
.Where(t => !conventions.IsInSystemConventionList(t)) //never auto-subscribe system messages
.Where(t => !conventions.IsCommandType(t)) //commands should never be subscribed to
.Where(t => conventions.IsEventType(t)) //only events unless the user asked for all messages
.Where(t => settings.AutoSubscribeSagas || handlerRegistry.GetHandlersFor(t).Any(handler => !typeof(Saga).IsAssignableFrom(handler.HandlerType))) //get messages with other handlers than sagas if needed
.ToList();
return(messageTypesHandled);
}
static List<Type> GetMessageTypesHandledByThisEndpoint(MessageHandlerRegistry handlerRegistry, Conventions conventions, SubscribeSettings settings)
{
var messageTypesHandled = handlerRegistry.GetMessageTypes() //get all potential messages
.Where(t => !conventions.IsInSystemConventionList(t)) //never auto-subscribe system messages
.Where(t => !conventions.IsCommandType(t)) //commands should never be subscribed to
.Where(conventions.IsEventType) //only events unless the user asked for all messages
.Where(t => settings.AutoSubscribeSagas || handlerRegistry.GetHandlersFor(t).Any(handler => !typeof(Saga).IsAssignableFrom(handler.HandlerType))) //get messages with other handlers than sagas if needed
.ToList();
return messageTypesHandled;
}
static List <Type> GetMessageTypesHandled(MessageHandlerRegistry handlerRegistry, Conventions conventions)
{
//get all potential messages
return(handlerRegistry.GetMessageTypes()
//never auto-subscribe system messages
.Where(t => !conventions.IsInSystemConventionList(t))
//commands should never be subscribed to
.Where(t => !conventions.IsCommandType(t))
//only events unless the user asked for all messages
.Where(t => conventions.IsEventType(t))
.ToList());
}
public IEnumerable <Type> GetMessageTypes()
{
return(_handlers.GetMessageTypes());
}
public Type[] GetHandledTypes()
{
return(_handlers.GetMessageTypes().ToArray());
}
public async Task Setup(string endpoint, int readsize, bool extraStats)
{
_endpoint = endpoint;
_readsize = readsize;
_extraStats = extraStats;
foreach (var client in _clients)
{
if (client.Settings.GossipSeeds == null || !client.Settings.GossipSeeds.Any())
{
throw new ArgumentException(
"Eventstore connection settings does not contain gossip seeds (even if single host call SetGossipSeedEndPoints and SetClusterGossipPort)");
}
var manager = new ProjectionsManager(client.Settings.Log,
new IPEndPoint(client.Settings.GossipSeeds[0].EndPoint.Address,
client.Settings.ExternalGossipPort), TimeSpan.FromSeconds(5));
await manager.EnableAsync("$by_category", client.Settings.DefaultUserCredentials).ConfigureAwait(false);
var discoveredEvents =
_registry.GetMessageTypes().Where(x => typeof(IEvent).IsAssignableFrom(x)).ToList();
// Dont use - we dont need category projection projecting our projection
var stream = $"{_endpoint}.{Assembly.GetEntryAssembly().GetName().Version}".Replace("-", "");
// Link all events we are subscribing to to a stream
var functions =
discoveredEvents
.Select(
eventType => $"'{eventType.AssemblyQualifiedName}': processEvent")
.Aggregate((cur, next) => $"{cur},\n{next}");
// Don't tab this '@' will create tabs in projection definition
var definition = @"
function processEvent(s,e) {{
linkTo('{1}.{0}', e);
}}
fromCategory('{0}').
when({{
{2}
}});";
var appDefinition = string.Format(definition, StreamTypes.Domain, stream, functions).Replace(Environment.NewLine, "\n");
var oobDefinition = string.Format(definition, StreamTypes.OOB, stream, functions).Replace(Environment.NewLine, "\n");
// Create a projection for domain events and one for OOB events, later we'll subscribe as PINNED to domain events
// and ROUNDROBIN for OOB events.
// OOB events by definition don't need ordering, so theres no reason to overload a single PINNED consumer
// if the user uses a ton of OOB events
try
{
var existing = await manager.GetQueryAsync($"{stream}.app.projection").ConfigureAwait(false);
if (existing != appDefinition)
{
Logger.Fatal(
$"Projection [{stream}] already exists and is a different version! If you've upgraded your code don't forget to bump your app's version!\nExisting:\n{existing}\nDesired:\n{appDefinition}");
throw new EndpointVersionException(
$"Projection [{stream}] already exists and is a different version! If you've upgraded your code don't forget to bump your app's version!");
}
}
catch (ProjectionCommandFailedException)
{
try
{
// Projection doesn't exist
await
manager.CreateContinuousAsync($"{stream}.app.projection", appDefinition, false,
client.Settings.DefaultUserCredentials)
.ConfigureAwait(false);
}
catch (ProjectionCommandFailedException)
{
}
}
try
{
var existing = await manager.GetQueryAsync($"{stream}.oob.projection").ConfigureAwait(false);
if (existing != oobDefinition)
{
Logger.Fatal(
$"Projection [{stream}] already exists and is a different version! If you've upgraded your code don't forget to bump your app's version!");
throw new EndpointVersionException(
$"Projection [{stream}] already exists and is a different version! If you've upgraded your code don't forget to bump your app's version!");
}
}
catch (ProjectionCommandFailedException)
{
try
{
// Projection doesn't exist
await
manager.CreateContinuousAsync($"{stream}.oob.projection", oobDefinition, false,
client.Settings.DefaultUserCredentials)
.ConfigureAwait(false);
}
catch (ProjectionCommandFailedException)
{
}
}
}
}
