public static IActionResult Run([HttpTrigger(AuthorizationLevel.Function, "get", Route = null)] HttpRequest req, ILogger logger)
{
IDatabase db = null;
AppInsightsLogger appInsightsLogger = new AppInsightsLogger(logger, LOGGING_SERVICE_NAME, LOGGING_SERVICE_VERSION);
string uuid = "nil";
var apiParams = req.GetQueryParameterDictionary();
if (apiParams != null && apiParams.Keys.Contains(UUID_KEYNAME))
{
uuid = apiParams[UUID_KEYNAME];
appInsightsLogger.LogInformation("Getting status for taskId: " + uuid, URL, uuid);
}
else
{
appInsightsLogger.LogWarning("Called without a taskId", URL);
return(new BadRequestObjectResult("The taskId parameter is requried."));
}
try
{
db = RedisConnection.GetDatabase();
}
catch (Exception ex)
{
appInsightsLogger.LogError(ex, URL, uuid);
return(new StatusCodeResult(500));
}
RedisValue storedStatus = RedisValue.Null;
try
{
storedStatus = db.StringGet(uuid);
if (storedStatus.HasValue)
{
appInsightsLogger.LogInformation("Found status in cache", URL, uuid);
return(new OkObjectResult(storedStatus.ToString()));
}
else
{
appInsightsLogger.LogWarning("Cannot find status in cache", URL, uuid);
return(new StatusCodeResult(204));
}
}
catch (Exception ex)
{
appInsightsLogger.LogError(ex, URL, uuid);
return(new StatusCodeResult(500));
}
}
public static IActionResult Run([HttpTrigger(AuthorizationLevel.Function, "post", Route = null)] HttpRequest req, ILogger logger)
{
AppInsightsLogger appInsightsLogger = new AppInsightsLogger(logger, LOGGING_SERVICE_NAME, LOGGING_SERVICE_VERSION);
string response = string.Empty;
const string SubscriptionValidationEvent = "Microsoft.EventGrid.SubscriptionValidationEvent";
string requestContent = new StreamReader(req.Body).ReadToEnd();
EventGridEvent[] eventGridEvents = JsonConvert.DeserializeObject <EventGridEvent[]>(requestContent);
// We should only have 1 event
foreach (EventGridEvent eventGridEvent in eventGridEvents)
{
JObject dataObject = eventGridEvent.Data as JObject;
// Deserialize the event data into the appropriate type based on event type
if (string.Equals(eventGridEvent.EventType, SubscriptionValidationEvent, StringComparison.OrdinalIgnoreCase))
{
var eventData = dataObject.ToObject <SubscriptionValidationEventData>();
appInsightsLogger.LogInformation($"Got SubscriptionValidation event data, validation code: {eventData.ValidationCode}, topic: {eventGridEvent.Topic}", string.Empty);
// Do any additional validation (as required) and then return back the below response
var responseData = new SubscriptionValidationResponse();
responseData.ValidationResponse = eventData.ValidationCode;
return(new OkObjectResult(responseData));
}
else
{
appInsightsLogger.LogInformation($"Backend webhook data: id: {eventGridEvent.Id}, eventType: {eventGridEvent.EventType}, subject: {eventGridEvent.Subject}, time: {eventGridEvent.EventTime}", eventGridEvent.Subject, eventGridEvent.Id);
var backendUri = new Uri(eventGridEvent.Subject);
var client = new HttpClient(new RetryHandler(new HttpClientHandler()));
var stringContent = new StringContent(eventGridEvent.Data.ToString(), Encoding.UTF8, "application/json");
try
{
appInsightsLogger.LogInformation($"Sending request to {backendUri} for taskId {eventGridEvent.Id}.", eventGridEvent.Subject, eventGridEvent.Id);
client.DefaultRequestHeaders.Add("taskId", eventGridEvent.Id);
var res = client.PostAsync(backendUri, stringContent).GetAwaiter().GetResult();
if (res.StatusCode == (System.Net.HttpStatusCode) 429) // Special return value indicating that the service is busy. Let event grid handle the retries.
{
appInsightsLogger.LogInformation("Backend service is busy. Event grid will retry with backoff.", eventGridEvent.Subject, eventGridEvent.Id);
return(new StatusCodeResult(429));
}
else if (!res.IsSuccessStatusCode)
{
appInsightsLogger.LogWarning($"Unable to send request to backend. Status: {res.StatusCode.ToString()}, Reason: {res.ReasonPhrase}", eventGridEvent.Subject, eventGridEvent.Id);
return(new StatusCodeResult(500));
}
}
catch (Exception ex)
{
appInsightsLogger.LogError(ex, eventGridEvent.Subject, eventGridEvent.Id);
return(new StatusCodeResult(500));
}
appInsightsLogger.LogInformation("Request has successfully been pushed to the backend.", eventGridEvent.Subject, eventGridEvent.Id);
return(new OkResult());
}
}
return(new OkResult());
}