private async Task StartNewSurveyAsync(string phoneNumber, ILambdaLogger logger)
{
// save info about the respondent
logger.LogLine($"Saving survey response for {Sanitizer.MaskPhoneNumber(phoneNumber)}");
var phoneNumberHash = Sanitizer.HashPhoneNumber(phoneNumber);
var surveyResponse = new SurveyResponse
{
PhoneNumberHash = phoneNumberHash,
TaskToken = "",
Responses = new Dictionary <string, string>()
};
await _DataAccess.SaveSurveyResponeAsync(surveyResponse).ConfigureAwait(false);
// start the workflow
logger.LogLine($"Starting workflow for {Sanitizer.MaskPhoneNumber(phoneNumber)}");
using (var client = StepFunctionClientFactory.GetClient())
{
var state = new State
{
PhoneNumber = phoneNumber
};
var req = new StartExecutionRequest
{
Name = phoneNumberHash + Guid.NewGuid().ToString("N"),
StateMachineArn = ServerlessConfig.StateMachineArn,
Input = JsonConvert.SerializeObject(state)
};
await client.StartExecutionAsync(req).ConfigureAwait(false);
}
}
private static async Task CompleteWaitForResponseAsync(string taskToken, State state)
{
using (var client = StepFunctionClientFactory.GetClient())
{
var req = new SendTaskSuccessRequest
{
TaskToken = taskToken,
Output = JsonConvert.SerializeObject(state)
};
await client.SendTaskSuccessAsync(req).ConfigureAwait(false);
}
}
private static async Task FailWaitForResponseAsync(string taskToken)
{
using (var client = StepFunctionClientFactory.GetClient())
{
var req = new SendTaskFailureRequest
{
TaskToken = taskToken,
Cause = "User requested do-over",
Error = "Restart"
};
await client.SendTaskFailureAsync(req).ConfigureAwait(false);
}
}
/// <summary>
/// Waits for an SMS activity to begin, then handles it.
/// </summary>
public async Task WaitSmsAsync(ILambdaContext context)
{
var startTime = DateTime.Now;
var timeAvailable = TimeSpan.FromMinutes(4);
using (var client = StepFunctionClientFactory.GetClient())
{
TimeSpan timeLeft;
do
{
context.Logger.LogLine("Polling GetActivityTask");
var arn = ServerlessConfig.WaitSmsResponseActivityArn;
var req = new GetActivityTaskRequest {
ActivityArn = arn
};
var result = await client.GetActivityTaskAsync(req).ConfigureAwait(false);
if (result.Input != null && result.TaskToken != null)
{
context.Logger.LogLine("Received token");
// get the current state for the activity
var state = JsonConvert.DeserializeObject <State>(result.Input);
// save the task token to the survey response and persist the current state
// so we can restore it later.
var surveyResponse = await _DataAccess.GetSurveyResponseAsync(Sanitizer.HashPhoneNumber(state.PhoneNumber))
.ConfigureAwait(false);
surveyResponse.TaskToken = result.TaskToken;
surveyResponse.SavedState = state;
await _DataAccess.SaveSurveyResponeAsync(surveyResponse).ConfigureAwait(false);
// ask the question -- do this last so that the current state is persisted with the task token
await AskQuestionAsync(state.PhoneNumber, Survey.GetQuestion(state.Question)).ConfigureAwait(false);
}
timeLeft = timeAvailable - (DateTime.Now - startTime);
} while (timeLeft.TotalMilliseconds >= 65000);
context.Logger.LogLine("Polling loop terminated");
}
}
