scrape-changes

Scrapes websites for changes and notifies the user when there are any (e.g by sending an email)

Monthly Downloads: 22

Programming language: Haskell

License: GNU General Public License v3.0 only

Tags: Network    

Latest version: v0.1.0.5

README

scrape-changes

This library scrapes websites and invokes callbacks when there are changes, similar to a RSS reader. Sending an email by invoking sendmail is a built-in callback mechanism. Of course, users can provide their own callback function in addition.

If you need more control over the scraping process (e.g. for using another HTTP method than GET), just open an issue or file a PR.

Example usage

scrapeChangesJobs :: Either [(Url, [ValidationError])] (IO ())
scrapeChangesJobs = repeatScrapeAll [
    -- Checks each minute for changes and sends a mail if there are any
    ScrapeSchedule {
      _scrapeScheduleCron = "* * * * *" -- std cron format
    , _scrapeScheduleConfig = mailScrapeConfig "http://www.google.co.uk" -- to scrape
                                               (MailAddr Nothing "[email protected]") -- from
                                               (MailAddr Nothing "[email protected]" :| []) -- to
    , _scrapeScheduleScraper = scrapeGoogleLogo --scrape function
    }
    -- Checks each minute for changes and notifies to syslog if there are any
  , ScrapeSchedule {
      _scrapeScheduleCron = "* * * * *"
    , _scrapeScheduleConfig = otherScrapeConfig "http://www.google.co.uk" 
                                                (\text -> Logger.infoM thisLogger . show $ 
                                                          "Change detected: " <> text)
    , _scrapeScheduleScraper = scrapeGoogleLogo
    }
  ]

runJobs :: IO ()
runJobs = (Logger.errorM thisLogger . show) `either` id $ scrapeChangesJobs 

Please look at scrape-changes-examples/examples.hs for a full working example