Crawls tech blogs and notifies you via Slack

Software engineers often subscribe to various tech blogs in order to keep up with the ever-evolving technology domain.

However, visiting many tech blogs each time is a painstaking task, and I would like to receive feeds to help me subscribe if possible.

Of course, you can use a dedicated feeder to receive feeds, but I'd like to send feeds to Slack, which I usually use for work, so that I can subscribe to tech blogs without having to consciously open feeder.

So I decided to create a system that would periodically go to the registered entries and notify Slack when there was an update.

There are similar mechanisms such as Slack's /feed and RSS registration using IFTTT, but both of them are not easy to use because the free version has a limit on the number of registrations.

Therefore, I decided to use GitHub Actions and Harper DB, which are free for OSS.

It doesn't have any particular meaning, but I imagined a spider running around on a tech blog (the web). But that's a crawler, isn't it?

• All free

  • Not using Slack Apps, Slack feed and IFTTT; There is no upper limit to the numbers for free plans.
  • Using HarperDB; a free plan exists.

• Post feeds to Slack only when there is an update.

• You can register an unlimited number of Feeds.

• It is easy to automate; This repository uses GitHub Actions to automate the process. And it's free.

• You can use pytermextract to extract technical terms in an article and display them on Slack.

HarperDB is a managed NoSQL DB service, and Tech Blog Spider uses HarperDB to store the last update of RSS entries.

• Get account for HarperDB

• Create an organization (or using existing org)

• Create an instance (recommend: HarperDB Cloud Instance)

• Create a scheme (By default, prd)

• Create 2 tables

  • entry_urls (hash attr is name)
  • last_published (hash attr is name)

create database(schema)

POST /
{
    "operation": "create_database",
    "database": "prd"
}

create entry_urls table

POST /
{
    "operation": "create_table",
    "database": "prd",
    "table": "entry_urls",
    "primary_key": "name"
}

create last_published table

POST /
{
    "operation": "create_table",
    "database": "prd",
    "table": "last_published",
    "primary_key": "name"
}

create attribute

POST /
{
    "operation": "create_attribute",
    "database": "prd",
    "table": "last_published",
    "attribute": "time"
}

Edit entry.csv to register the RSS entries you want to subscribe to.

• First column is name: must be unique.
• Second column is url: RSS feed url (compatible RSS1.0, RSS2.0, Atom0.3, Atom1.0).
• Third column is icon if you want to set another icon instead of favicon.

name,url,icon
"aws","https://aws.amazon.com/jp/blogs/aws/feed/","https://i.imgur.com/Z5YLUiS.png"

Slack incoming webhooks using the new Slack API, Apps, consume Apps, so I added a custom integration.

Set environment (OS Env) the below.

For example, when setting environment variables in GitHub Actions, it is recommended to register the environment variable itself in the secret and refer to it from the secret as shown below.

- name: Run RSS
  env:
    HARPERDB_URL: ${{ secrets.HARPERDB_URL }}
    HARPERDB_USERNAME: ${{ secrets.HARPERDB_USERNAME }}
    HARPERDB_PASSWORD: ${{ secrets.HARPERDB_PASSWORD }}
    HARPERDB_SCHEMA: ${{ secrets.HARPERDB_SCHEMA }}
    SLACK_WEBHOOK_URL: ${{ secrets.SLACK_WEBHOOK_URL }}
    LOGGING_LEVEL: "DEBUG"
  run: python3 src/main.py

The required libraries are listed in requirements.txt and can be installed by pip.

pip install -r requirements.txt

python src/create_config.py

python src/main.py

MIT © tubone.