private async Task HandleEventSubsciptionAsync(IServiceDefinition serviceDefinition, string eventName, HttpContext context, CancellationToken ct)
{
if (context.Request.Method != "PUT" && context.Request.Method != "POST")
{
context.Response.StatusCode = 405; // Method Not Allowed
context.Response.ContentType = "text/plain";
await context.Response.Body.WriteAsync(Encoding.UTF8.GetBytes("To subscribe to an event, use one of these HTTP verbs: GET, POST, PUT"));
return;
}
var serviceName = (context.Request.Query.TryGetValue("service", out var serviceValues) && serviceValues.Count == 1) ? serviceValues[0] : null;
if (string.IsNullOrWhiteSpace(serviceName))
{
context.Response.StatusCode = 404;
context.Response.ContentType = "text/plain";
await context.Response.Body.WriteAsync(Encoding.UTF8.GetBytes("Missing 'service=xxx' in the URL query."));
return;
}
var proxyName = (context.Request.Query.TryGetValue("proxy", out var proxyValues) && proxyValues.Count == 1) ? proxyValues[0] : null;
var subscriberServiceId = new ServiceId {
ServiceName = serviceName, ProxyName = proxyName
};
var eventId = new EventId {
EventName = eventName
};
var publisherServiceId = new ServiceId {
ServiceName = serviceDefinition.Name
};
var eventDesc = new EventDescriptor {
ServiceId = publisherServiceId, EventId = eventId
};
_eventDispatcher.OnSubscriberAdded(eventDesc, subscriberServiceId);
context.Response.StatusCode = 200;
}