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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