Logging

Vessel logs to $stdout at the debug level. Pass your own logger to change that:

Vessel::Logger.instance = Logger.new("log/vessel.log", level: Logger::INFO)

Any object responding to debug, info, warn and error works. Use it from your crawler or middleware as well:

Vessel::Logger.info("Saved #{hash[:title]}")

At the debug level Vessel logs every scheduled request and every handler call, at the info level the visited urls and the stats every 4 seconds, at the error level network issues and errors raised in the handlers and the middleware.

To see what the browser does pass FERRUM_DEBUG=true or a logger to the driver:

class MyScraper < Vessel::Cargo
  driver :ferrum, logger: $stderr
end