[Write | EmailSender] Create slice SendEmailMessage -> EmailMessageWasSent

[MateuszNaKodach]

Dependencies (blockers)

• No blockers. Ready to go!

Subtasks
Command definition:

• Create command type SendEmailMessage in modules/shared/commands
• Create SendEmailMessageApplicationCommand class in modules/shared/commands

Domain logic:

• Create function sendEmailMessage in modules/write/email-sender/domain.
• Take SendEmailMessage and appEmailAddress as parameters. appEmailAddress will be from of EmailMessageWasSent
• Return EmailMessageWasSent on every SendEmailMessage.

Application logic:

• Create env variable like APP_EMAIL_ADDRESS and use it as argument of sendEmailMessage.
• Create CommandHandler for SendEmailMessageApplicationCommand
• Send email using Nodemailer before saving EmailMessageWasSent event (executing domain logic).
• Execute domain logic for sendEmailMessage task. Event stream name should be in format EmailMessage_${emailMessageId}

Infrastructure

• Configure node-mailer library. Try to use port & adapters architecture. Prepare in application layer port (interface) for sender and implement adapter which will invoke node-mailer.

Testing strategy

• Write tests for your module by invoking command and checking published event.
• Test your command handler by executing a command and checking if mail was successfully sent. You can check if method of EmailSender was called or use Mailhog for that (add to docker-compose). Example test with mailhog you can find here: https://github.com/nowakprojects/CodersCamp2020.Project.FullStack-Node-React.TableSoccerTournaments/blob/develop/backend/test/modules/email-sending/core/application/SendEmail.mailhog-spec.ts

Screenshot from MIRO (Event Modeling):

[github-actions]

Branch issue-261-_Write_EmailSender_Create_slice_SendEmailMessage_EmailMessageWasSent created!