public static async Task <bool> UserRegistrationOrchestration(
[OrchestrationTrigger] DurableOrchestrationContext context)
{
var input = context.GetInput <UserRegistrationInput>();
// 1. Send confirmation email
var sendConfirmationEmailInput = new SendConfirmationEmailInput
{
RegistrationConfirmationURL = $"{input.BaseUri}/emailconfirmation/{input.InstanceId}",
Email = input.Email,
Name = input.Name
};
await context.CallActivityAsync(nameof(SendConfirmationEmailActivity), sendConfirmationEmailInput);
// 2. Setup timer and wait for external event to be executed. Whatever comes first continues
using (var cts = new CancellationTokenSource())
{
var expiredAt = context.CurrentUtcDateTime.Add(TimeSpan.FromSeconds(30));
var customStatus = new UserRegistrationOrchestatorStatus {
Text = "Waiting for email confirmation", ExpireAt = expiredAt
};
#if DEBUG
// only send the confirmation URL back in debug mode
customStatus.RegistrationConfirmationURL = sendConfirmationEmailInput.RegistrationConfirmationURL;
#endif
context.SetCustomStatus(customStatus);
var confirmationButtonClicked = context.WaitForExternalEvent <bool>("EmailConfirmationReceived");
var timeout = context.CreateTimer(expiredAt, cts.Token);
var winner = await Task.WhenAny(confirmationButtonClicked, timeout);
// Cancel the timer if it has not yet been completed
if (!timeout.IsCompleted)
{
cts.Cancel();
}
if (winner == confirmationButtonClicked)
{
// TODO: add here logic to actually create the user in your database
context.SetCustomStatus(new UserRegistrationOrchestatorStatus {
Text = "Email activation succeeded"
});
return(true);
}
else
{
context.SetCustomStatus(new UserRegistrationOrchestatorStatus {
Text = "Email activation timed out"
});
return(false);
}
}
}
public static void SendConfirmationEmailActivity(
[ActivityTrigger] SendConfirmationEmailInput input,
[SendGrid(ApiKey = "sendGridApiKey")] out SendGridMessage message,
TraceWriter log)
{
message = new SendGridMessage();
message.AddTo(input.Email);
message.SetSubject("[Azure Durable Function Demo] - User registration confirmation");
var htmlContent = new StringBuilder();
htmlContent
.AppendLine("<html>")
.AppendLine($"<head><meta name=\"viewport\" content=\"width=device-width\" /><meta http-equiv=\"Content-Type\" content=\"text/html; charset=UTF-8\" /><title>Email confirmation</title>")
.AppendLine("<body>")
.AppendLine($"<p>Hello {input.Name}</p>")
.AppendLine($"<p>To activate your account open this page: <a href=\"{input.RegistrationConfirmationURL}\">{input.RegistrationConfirmationURL}</a></p>")
.AppendLine("</body></html>");
message.AddContent("text/html", htmlContent.ToString());
message.SetFrom(new EmailAddress("*****@*****.**"));
log.Info($"Email sent to {input.Email} with confirmation URL {input.RegistrationConfirmationURL}");
}