Class: Pluto::SiteFetcher

Inherits:
Object
  • Object
show all
Includes:
LogUtils::Logging, Models
Defined in:
lib/pluto/update/site_fetcher.rb

Instance Method Summary collapse

Constructor Details

#initialize ⇒ SiteFetcher

Returns a new instance of SiteFetcher.



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# File 'lib/pluto/update/site_fetcher.rb', line 11

def initialize
  @worker  = Fetcher::Worker.new
end

Instance Method Details

#debug? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/pluto/update/site_fetcher.rb', line 15

def debug?()  Pluto.config.debug?;  end

#fetch(site_rec) ⇒ Object 



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# File 'lib/pluto/update/site_fetcher.rb', line 18

def fetch( site_rec )
  ####################################################
  # try smart http update; will update db records

  site_url = site_rec.url
  site_key = site_rec.key

  ### todo/fix: normalize/unifiy feed_url
  ##  - same in fetcher - use shared utitlity method or similar

  @worker.use_cache = true
  @worker.cache[ site_url ] = {
    'etag'          => site_rec.http_etag,
    'last-modified' => site_rec.http_last_modified
  }

  response = @worker.get( site_url )
  @worker.use_cache = false   # fix/todo: restore old use_cache setting instead of false

  site_fetched = Time.now

  ###
  # Note: Net::HTTP will NOT set encoding UTF-8 etc.
  # will be set to ASCII-8BIT == BINARY == Encoding Unknown; Raw Bytes Here
  # thus, set/force encoding to utf-8
  site_text = response.body.to_s
  site_text = site_text.force_encoding( Encoding::UTF_8 )

  if response.code == '304'  # not modified (conditional GET - e.g. using etag/last-modified)

    puts "OK - fetching site '#{site_key}' - HTTP status #{response.code} #{response.message}"
    puts "no change; request returns not modified (304); skipping parsing site config"
    return nil   # no updates available; nothing to do
 
  elsif response.code != '200'   # note Net::HTTP response.code is a string in ruby

    puts "*** error: fetching site '#{site_key}' - HTTP status #{response.code} #{response.message}"

    site_attribs = {
      http_code:          response.code.to_i,
      http_server:        response.header[ 'server' ],
      http_etag:          nil,
      http_last_modified: nil,
      fetched:            site_fetched
    }
    site_rec.update!( site_attribs )

    ## add log error activity -- in future add to error log - better - why? why not?
    Activity.create!( text: "*** error: fetching site '#{site_key}' - HTTP status #{response.code} #{response.message}" )

    return nil  #  sorry; no feed for parsing available
  else
    # assume 200; continue w/ processing
  end

  puts "OK - fetching site '#{site_key}' - HTTP status #{response.code} #{response.message}"

  site_attribs = {
    http_code:          response.code.to_i,
    http_server:        response.header[ 'server' ],
    http_etag:          response.header[ 'etag' ],
    http_last_modified: response.header[ 'last-modified' ], ## note: last_modified header gets stored as plain text (not datetime)
    fetched:            site_fetched
  }

  ## if debug?
    puts "http header - server: #{response.header['server']} - #{response.header['server'].class.name}"
    puts "http header - etag: #{response.header['etag']} - #{response.header['etag'].class.name}"
    puts "http header - last-modified: #{response.header['last-modified']} - #{response.header['last-modified'].class.name}"
  ## end

  site_rec.update!( site_attribs )


  ## logger.debug "site_text:"
  ## logger.debug site_text[ 0..300 ] # get first 300 chars

  site_text
end