Framework to get started.

features.rb

require "redis"
redis = Redis.new
INITIAL_FILE = ARGV[0] #the initial file
END_FILE = ARGV[1] #the end file

def listFriends(user, file)
	key1 = file + ":" + user + ".to"
	key2 = file + ":" + user + ".from"
	return redis.sinter key1, key2
end

def listStalkers(user) #unreciprocated followers, who's stalking you
	key1 = file + ":" + user + ".to"
	key2 = file + ":" + user + ".from"
	return redis.sdiff key2, key1
end

def listStalkees #unreciprocated follows, who you're stalking
	key1 = file + ":" + user + ".to"
	key2 = file + ":" + user + ".from"
	return redis.sdiff key1, key2
end

def listFansOfInterest(user1, user2, file)
	key1 = file + ":" + user1 + ".to"
	key2 = file + ":" + user2 + ".to"
	return redis.sinter key1, key2
end


#################################################
#START WRITING YOUR FEATURES HERE #ilovefeatures#
#################################################

def commonNeighbors(a, b)
	return " not written yet, someone write this shit"
end

def Jaccard(a,b)
	return " not written yet, someone write this shit"
end

def AdamicAdar(a,b)
	return " not written yet, someone write this shit"
end

def Katz(a,b)
	return " is a little bitch, someone write this shit"
end

def PageRank(a,b)
	return " not written yet, someone write this shit"
end

def PrefAttach(a,b)
	return " not written yet, someone write this shit"
end

if __FILE__ == $0 #main method
	a = "first user"
	b = "second user"
  	puts "Common Neighbors:" + commonNeighbors(a,b)
 	puts "Jaccard:" + Jaccard(a,b)
  	puts "Jaccard:" + Jaccard(a,b)
  	puts "Katz:" + Katz(a,b)
  	puts "PageRank:" + PageRank(a,b)
  	puts "Preferrential Attachment:" + PrefAttach(a,b)

end

parser.rb

#to account for only newly formed edges we might need to rethink this.

require "redis"
redis = Redis.new #create new redis instance with default port and localhost, make sure VM is on

FILE_IN = ARGV[0] #read in first cmdline argument (filename)
fileName = FILE_IN.split(".") #split filename from extension


f = File.new(FILE_IN) 
f.each do |line| 
	lineArray = line.split
	user = lineArray[0]
	numValues = lineArray[2].to_i
	if lineArray[1] == '0'
		followKey = fileName[0] + ":" + user  + ".to"
		spamKey = fileName[0] + ":" + user  + ".numAdded"

		1.upto(numValues) { |i| redis.sadd followKey, lineArray[i+2] } #add values to the set of people user has added to his circle
		redis.set spamKey, numValues #how many requests this user makes (is he a spammer?)
##IGNORING 1's UNLESS WE NEED THEM (SAVING SPACE)
=begin
	else
		followKey = fileName[0] + ":" + user  + ".from"
		popularityKey = fileName[0] + ":" + user  + ".numAddedBy"

		1.upto(numValues) { |i| redis.sadd followKey, lineArray[i+2] } #add values to the set of circles user has belongs to
		redis.set popularityKey, numValues #how popular a user is (how many people have added)
	end
=end
	listOfUsersKey = fileName[0] + ".users" 
	redis.sadd listOfUsersKey, user #set of users for this particular snapshot (we only care about followbacks not new edges)

end
f.close