app

Crawler for data.gov.ua

PLEASE USE RESPONSIVELY WITH RESPECT TO DATA.GOV.UA INFRASTRUCTURE.

A simple node.js application to get metadata of datasets from data.gov.ua and store it in file with retry and backoff strategies.

Default options are set accordingly to data.gov.ua robots.txt Crawl-delay parameter from 09/01/2017, which equals to 10 seconds delay between requests.

Quickstart

npm i
node app.js

Download Strategies

By default a batch download strategy is used. This means that metadata of datasets will be downloaded and appended to file page by page from datasets catalog. This is recommended strategy as the whole array of metadata is not stored in memory but freed and appended in batches.

If you by any chance want to process all the pages in bulk and then store the entire array in file, simply run:

node app.js --bulk

Executing batch job with cron schedule

The cron format consists of:

*    *    *    *    *    *
┬    ┬    ┬    ┬    ┬    ┬
│    │    │    │    │    |
│    │    │    │    │    └ day of week (0 - 7) (0 or 7 is Sun)
│    │    │    │    └───── month (1 - 12)
│    │    │    └────────── day of month (1 - 31)
│    │    └─────────────── hour (0 - 23)
│    └──────────────────── minute (0 - 59)
└───────────────────────── second (0 - 59, OPTIONAL)

Examples with the cron format:

node app.js --cron "0 17 ? * 0,4-6"

To start job immediately after startup use --run option.

Proxy

The app uses http-proxy-agent package to override http.globalAgent to use proxy settings if it is needed. This can be done by setting http_proxy environment variable.

TODO

• Add ability to override default options
• Add EventEmitter functionality
• Refactor for programmatical usage
• Extract to separate repository and publish to npm

Alternatives

https://github.com/mishkinstvo/DataGovUaParser

License

MIT (c) O(one)