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eternalpose

Minimal manga alerting application as a first project in Go. I figured this would be a good first project as it covers web scraping, error handling, text parsing, scheduling, and how to deploy go code to containers.

I read One Piece weekly, and my friends quite like Jujutsu Kaisen. This will let us know when the next chapter is out!

Configuration

Manga can be specified in mangas.json by specifying a manga title, a regex term to search for on TCBScans, and the current chapter. This JSON is also used as simple storage of the current chapter so as not to resend the same chapter many times.

[
    {
        "title": "One Piece",
        "regex": "One Piece Chapter (?P<Chapter>\\d{4})$",
        "users": [
            "<@173232081575346178>"
        ],
        "currentChapter": 1117
    },
    {
        "title": "Jujutsu Kaisen",
        "regex": "Jujutsu Kaisen Chapter (?P<Chapter>\\d{3})$",
        "users": [
            "<c@228997488563060736>",
            "<@262637906865291264>"
        ],
        "currentChapter": 262
    }
]

Running

Set up environment variables in a file called .env

export WEBHOOK_URL=https://discord.com/api/webhooks/123/456

Source those env files with:

$ source .env

Finally, it can be run:

$ go build cmd/eternalpose/main.go
$ ./main

The program will run eternally, and run the scheduled manga scraping job once per hour, every day of the week.

Dockerizing

The docker image can be built pretty easily:

$ docker build . --tag eternalpose

Then run the dockerfile with the environment variable:

$ docker run -dit -e WEBHOOK_URL="https://discord.com/api/webhooks/123/456" --name eternalpose-service eternalpose

Deploying to Kubernetes

Details on the deployment to kubernetes can be found at vaughnw128/k8s-infra

First, the discord webhook needs to be initialized as a secret:

$ kubectl create secret generic discord-webhook -n eternalpose --from-literal="discord-webhook=https://discord.com/api/webhooks/123/456"

Once the secret has been created, the application can be deployed:

$ kubectl apply -f eternalpose.yml