har_script_obj_oriented.rb

require 'json'
require "net/http"
require "uri"

class HarFetcher
	def get url
		response = Net::HTTP.get_response(URI.parse(url))
		return JSON.parse(response.body) 
	end
end

class HarParser
	def initialize harsData
		# entries are all we want. Assume we're getting the data as hash from HarFetcher.get method.  
		@entriesHash = harsData['log']['entries']
	end
	
	def getFastest
		fastestEntry = {}
		for entry in @entriesHash
			if !fastestEntry.has_key? "time" or fastestEntry['time'] > entry['time']
				fastestEntry = convertEntryToHash(entry)
			end
		end
		
		return fastestEntry
	end
	
	def getSlowest
		slowestEntry = {}
		for entry in @entriesHash
			if !slowestEntry.has_key? "time" or slowestEntry['time'] < entry['time']
				slowestEntry = convertEntryToHash(entry)
			end
		end
		
		return slowestEntry
	end
	
	private
	def convertEntryToHash entry
		return {"time" => entry['time'], "file" => entry['request']['url']}
	end
end

# USAGE
data = HarFetcher.new.get(ARGV[0])
parser = HarParser.new(data)
fastest = parser.getFastest()
slowest = parser.getSlowest()

puts "Fastest: #{URI.unescape(fastest['file'])} #{fastest['time']} seconds"
puts "Slowest: #{URI.unescape(slowest['file'])} #{slowest['time']} seconds"