protected async Task <IMessage> HandleResponse(RequestMessage requestMessage, ResponseMessage responseMessage)
{
if (responseMessage.Header.ResponseStatusCode == HttpStatusCode.OK &&
responseMessage.Body.Failure == 0 && responseMessage.Body.CanonicalIds == 0)
{
return(null);
}
//Body(FCM response content) can be null when Satus Code is Unauthorized (401) or BadRequest (400)
//because FCM response content contains reason phrase as html
//and as such is invalid json and Body is null. In this case, there is nothing to handle for unauthorized responses
//and the only cause is the wrong server key or missing registration token or request containing invalid data not proper with FCM protocol.
//The API consumer must make sure the right server key is provided in their AppSettings or the request is valid
if (responseMessage.Body == null || (responseMessage.Body.Failure == 0 && responseMessage.Body.CanonicalIds == 0))
{
return(null);
}
List <string> tokensForBackOffPush = new List <string>();
for (var i = 0; i < responseMessage.Body.Results.Length; i++)
{
var result = responseMessage.Body.Results[i];
if (result.Error == null && result.RegistrationId == null)
{
continue;
}
if (!string.IsNullOrWhiteSpace(result.MessageId) && !string.IsNullOrWhiteSpace(result.RegistrationId))
{
if (requestMessage.IsBulk)
{
updateTokenFunc?.Invoke(requestMessage.Body.RegistrationIds[i], result.RegistrationId);
}
else
{
updateTokenFunc?.Invoke(requestMessage.Body.To, result.RegistrationId);
}
}
else if (result.Error == ResponseMessageError.NotRegistered)
{
if (requestMessage.IsBulk)
{
deleteTokenFunc?.Invoke(requestMessage.Body.RegistrationIds[i]);
}
else
{
deleteTokenFunc?.Invoke(requestMessage.Body.To);
}
}
else if (result.Error == ResponseMessageError.Unavailable ||
result.Error == ResponseMessageError.InternalServerError ||
result.Error == ResponseMessageError.DeviceMessageRateExceeded ||
result.Error == ResponseMessageError.TopicsMessageRateExceeded)
{
if (requestMessage.IsBulk)
{
tokensForBackOffPush.Add(requestMessage.Body.RegistrationIds[i]);
}
else
{
tokensForBackOffPush.Add(requestMessage.Body.To);
break;
}
}
//else {} = check for more response errors and act accordingly
//BadRequest or Unauthorized - there is nothing to handle here, check the status code and reason phrase from CloudResponseMessage object
//but the API consumer must make sure, it provides correct and valid data
//as of now all possible errors are checked through CloudRequestMessageBody property inforcements and
//CloudRequestMessage ValidateRequest() method
}
ResponseMessage responseMessageFromBackOffPush = new ResponseMessage();
if (tokensForBackOffPush.Count > 0)
{
RequestMessage newRequestMessage = (RequestMessage)requestMessage.DeepCopy();
if (tokensForBackOffPush.Count == 1)
{
newRequestMessage.Body.RegistrationIds = null;
newRequestMessage.Body.To = tokensForBackOffPush[0];
}
else
{
newRequestMessage.Body.To = null;
newRequestMessage.Body.RegistrationIds = tokensForBackOffPush.ToArray();
}
var status = await InitExponentialBackOffPush(newRequestMessage, responseMessage.Header.RetryAfterInMilliSeconds);
if (status != null)
{
responseMessageFromBackOffPush = (ResponseMessage)status;
}
else
{
responseMessageFromBackOffPush = null;
}
}
if (responseMessageFromBackOffPush != null)
{
return(responseMessageFromBackOffPush);
}
else
{
return(responseMessage);
}
}
/// <summary>
/// This function provides retry mechanism for Firebase http request messages
/// </summary>
/// <param name="func">The provided function to execute</param>
/// <param name="maxRetries">The maximum number of retries</param>
/// <param name="waitBetweenRetrySec">The wait time in seconds between retries</param>
/// <param name="retryType">The retry approach to execute the provided 'func' function</param>
/// <param name="retryAfter">Start this method after 'retryAfter' which is in milliseconds</param>
/// <returns></returns>
public async Task <ResponseMessage> ExecFuncWithRetry(Func <IMessage, Task <ResponseMessage> > func,
IMessage funcParamRequestMessage, int maxRetries, int waitBetweenRetrySec,
BackoffType retryType, int?retryAfter = null)
{
if (func == null || funcParamRequestMessage == null)
{
throw new ArgumentNullException("No function provided or its IMessage parameter is null");
}
if (maxRetries <= 0)
{
throw new ArgumentException("maxRetries is smaller than 1. Please provide maxRetries > 0");
}
RequestMessage paramRequestMessage = new RequestMessage();
List <string> tokensForBackOffPush = new List <string>();
int retryCount = 1;
if (retryAfter != null && retryAfter > 0)
{
Thread.Sleep((int)retryAfter);
}
while (retryCount <= maxRetries)
{
ResponseMessage = await func(funcParamRequestMessage);
paramRequestMessage = (RequestMessage)funcParamRequestMessage;
tokensForBackOffPush = new List <string>();
if (ResponseMessage.Header.ResponseStatusCode == System.Net.HttpStatusCode.OK &&
ResponseMessage.Body.Failure == 0 && ResponseMessage.Body.CanonicalIds == 0)
{
return(ResponseMessage);
}
else
{
for (var i = 0; i < ResponseMessage.Body.Results.Length; i++)
{
var result = ResponseMessage.Body.Results[i];
if (result.Error == null && result.RegistrationId == null)
{
continue;
}
if (!string.IsNullOrWhiteSpace(result.MessageId) && !string.IsNullOrWhiteSpace(result.RegistrationId))
{
if (paramRequestMessage.IsBulk)
{
PushNotificationService.updateTokenFunc?.Invoke(paramRequestMessage.Body.RegistrationIds[i], result.RegistrationId);
}
else
{
PushNotificationService.updateTokenFunc?.Invoke(paramRequestMessage.Body.To, result.RegistrationId);
}
}
else if (result.Error == ResponseMessageError.NotRegistered)
{
if (paramRequestMessage.IsBulk)
{
PushNotificationService.deleteTokenFunc?.Invoke(paramRequestMessage.Body.RegistrationIds[i]);
}
else
{
PushNotificationService.deleteTokenFunc?.Invoke(paramRequestMessage.Body.To);
}
}
else if (result.Error == ResponseMessageError.Unavailable ||
result.Error == ResponseMessageError.InternalServerError ||
result.Error == ResponseMessageError.DeviceMessageRateExceeded ||
result.Error == ResponseMessageError.TopicsMessageRateExceeded)
{
if (paramRequestMessage.IsBulk)
{
tokensForBackOffPush.Add(paramRequestMessage.Body.RegistrationIds[i]);
}
else
{
tokensForBackOffPush.Add(paramRequestMessage.Body.To);
break;
}
}
}
if (tokensForBackOffPush.Count > 0)
{
TimeSpan sleepTime;
if (retryType == BackoffType.Linear)
{
sleepTime = TimeSpan.FromSeconds(waitBetweenRetrySec);
}
else
{
sleepTime = TimeSpan.FromSeconds(waitBetweenRetrySec * retryCount);
}
Thread.Sleep(sleepTime);
retryCount++;
if (tokensForBackOffPush.Count < ResponseMessage.Body.Results.Length && retryCount <= maxRetries)
{
//deep copy is not neccessary, if remove - do more testing
RequestMessage newRequestMessage = (RequestMessage)paramRequestMessage.DeepCopy();
if (tokensForBackOffPush.Count == 1)
{
newRequestMessage.Body.RegistrationIds = null;
newRequestMessage.Body.To = tokensForBackOffPush[0];
}
else
{
newRequestMessage.Body.To = null;
newRequestMessage.Body.RegistrationIds = tokensForBackOffPush.ToArray();
}
funcParamRequestMessage = newRequestMessage;
}
}
else
{
break;
}
}
}
//At this point ResponseMessage == paramRequestMessage (registrationToken-Count wise)
//if tokensForBackOffPush has elements(registrationTokens), than those failed to be sent a notification
//add registrationId to ResponseMessage.Body.Results[i].OriginalRegistrationId and RequestRetryStatus, for debugging or logging purposes
//otherwise all notifications were sent successfully
#if TRACK_FAILED_REQUESTS_ENABLED
if (tokensForBackOffPush.Count > 0)
{
if (paramRequestMessage.IsBulk)
{
for (int i = 0; i < tokensForBackOffPush.Count; i++)
{
for (int j = 0; j < paramRequestMessage.Body.RegistrationIds.Length; j++)
{
if (tokensForBackOffPush[i] == paramRequestMessage.Body.RegistrationIds[j])
{
if (retryCount >= maxRetries)
{
ResponseMessage.Body.Results[j].RequestRetryStatus = PushMessageStatus.FailedWithMaxRetries;
}
else
{
ResponseMessage.Body.Results[j].RequestRetryStatus = PushMessageStatus.FailedWithPartialRetries;
}
ResponseMessage.Body.Results[j].OriginalRegistrationId = paramRequestMessage.Body.RegistrationIds[j];
break;
}
}
}
}
else
{
if (retryCount >= maxRetries)
{
ResponseMessage.Body.Results[0].RequestRetryStatus = PushMessageStatus.FailedWithMaxRetries;
}
else
{
ResponseMessage.Body.Results[0].RequestRetryStatus = PushMessageStatus.FailedWithPartialRetries;
}
ResponseMessage.Body.Results[0].OriginalRegistrationId = paramRequestMessage.Body.To;
}
}
#endif
return(ResponseMessage);
}