20_Worker_Services.md

[Stephen Grider] Microservices with Node JS and React [ENG, 2020]

20. Worker Services

01. The Expiration Service

02. Expiration Options

03. Initial Setup

$ cd expiration

copy some codes from tickets

$ npm install --save bull @types/bull

04. A Touch of Kubernetes Setup

05. File Sync Setup

$ cd skaffold
$ skaffold dev

06. Listener Creation

07. What's Bull All About

08. Creating a Queue

09. Queueing a Job on Event Arrival

10. Testing Job Processing

CREATE TICKET

// CREATE ORDER
$ curl \
--insecure \
--cookie /tmp/cookies.txt \
--data '{"ticketId":"5ec43c86298c01001811bbb7"}' \
--header "Content-Type: application/json" \
--request POST https://ticketing.dev/api/orders \
| python -m json.tool

response:

{
    "expiresAt": "2020-05-19T20:23:05.480Z",
    "id": "5ec43ca50880b600192cf43d",
    "status": "created",
    "ticket": {
        "id": "5ec43c86298c01001811bbb7",
        "price": 10,
        "title": "concert",
        "version": 0
    },
    "userId": "5ec43c7cb0fd040023683c8b",
    "version": 0
}

10. Testing Job Processing

11. Delaying Job Processing

12. Defining the Expiration Complete Event

$ cd expiration
$ npm update @grider-ms-tickets/common

$ cd orders
$ npm update @grider-ms-tickets/common

13. Publishing an Event on Job Processing

14. Handling an Expiration Event

15. Emitting the Order Cancelled Event

16. Testing the Expiration Complete Listener

17. A Touch More Testing

$ cd orders
$ npm run test

18. Listening for Expiration

CREATE TICKET
CREATE ORDER

19. Don't Cancel Completed Orders!

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Marley

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