/// <summary>
/// Creates a new handler for handling the messages of the specified subscription
/// </summary>
/// <param name="subscriptionId">The id of the subscription to handle the messages for</param>
/// <returns>A new handler for handling the messages of the specified subscription</returns>
protected virtual EventHandler <StanMsgHandlerArgs> CreateEventHandlerFor(string subscriptionId)
{
return(async(sender, e) =>
{
this.Logger.LogInformation("An event with subject '{subject}' has been received from the underlying NATS Streaming sink.", e.Message.Subject);
this.Logger.LogInformation("Dispatching the resulting cloud event with subject '{subject}' to the gateway...", e.Message.Subject);
CloudEvent cloudEvent = CloudEventBuilder.FromEvent(this.EventFormatter.DecodeJObject(JsonConvert.DeserializeObject <JObject>(Encoding.UTF8.GetString(e.Message.Data))))
.WithSubscriptionId(subscriptionId)
.WithSequence(e.Message.Sequence)
.HasBeenRedelivered(e.Message.Redelivered)
.Build();
CloudEventContent cloudEventContent = new CloudEventContent(cloudEvent, ContentMode.Structured, new JsonEventFormatter());
using (HttpResponseMessage response = await this.HttpClient.PostAsync("pub", cloudEventContent))
{
string content = await response.Content?.ReadAsStringAsync();
if (!response.IsSuccessStatusCode)
{
this.Logger.LogError($"An error occured while dispatching a cloud event of type '{{eventType}}' to the eventing controller: the remote server response with a '{{statusCode}}' status code.{Environment.NewLine}Details: {{responseContent}}", cloudEvent.Type, response.StatusCode, content);
response.EnsureSuccessStatusCode();
}
}
this.Logger.LogInformation("The cloud event with subject '{subject}' has been successfully dispatched to the gateway.", e.Message.Subject);
e.Message.Ack();
});
}
/// <summary>
/// Dispatches the <see cref="ResolvedEvent"/> to the <see cref="CloudEvent"/> gateway
/// </summary>
/// <param name="subscriptionId">The id of the subscription the <see cref="CloudEvent"/> originates from</param>
/// <param name="e">The <see cref="ResolvedEvent"/> to dispatch</param>
/// <returns>A new awaitable <see cref="Task"/></returns>
protected virtual async Task DispatchEventAsync(string subscriptionId, ResolvedEvent e)
{
try
{
this.Logger.LogInformation("An event has been received from the underlying EventStore sink.");
this.Logger.LogInformation("Dispatching the resulting cloud event to the gateway...");
CloudEvent cloudEvent = CloudEventBuilder.FromEvent(this.EventFormatter.DecodeJObject(JsonConvert.DeserializeObject <JObject>(Encoding.UTF8.GetString(e.Event.Data))))
.WithSubscriptionId(subscriptionId)
.WithSequence((ulong)e.Event.EventNumber)
.Build();
CloudEventContent cloudEventContent = new CloudEventContent(cloudEvent, ContentMode.Structured, new JsonEventFormatter());
using (HttpResponseMessage response = await this.HttpClient.PostAsync("pub", cloudEventContent))
{
string content = await response.Content?.ReadAsStringAsync();
if (!response.IsSuccessStatusCode)
{
this.Logger.LogError($"An error occured while dispatching a cloud event of type '{{eventType}}' to the eventing controller: the remote server response with a '{{statusCode}}' status code.{Environment.NewLine}Details: {{responseContent}}", cloudEvent.Type, response.StatusCode, content);
response.EnsureSuccessStatusCode();
}
}
this.Logger.LogInformation("The cloud event has been successfully dispatched to the gateway.");
}
catch (HttpRequestException)
{
throw;
}
catch (Exception ex)
{
this.Logger.LogError($"An error occured while dispatching a cloud event to the gateway.{Environment.NewLine}Details: {{ex}}", ex.Message);
throw;
}
}