Created
October 30, 2011 03:39
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Track UChicago local bus system using defined 'stops'
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# TODO html/jquery for getting all the points on the route | |
require 'yaml' | |
require 'json' | |
require 'open-uri' | |
require 'redis' | |
ROUTE = 1000299 | |
ERROR = 0.0001 #This is radial wiggle room for arriving buses, in lat/lng | |
def get_data(route) | |
vehicles_url = "http://api.transloc.com/1.0/vehicles.json?agencies=100" | |
vehicles_data = open("http://api.transloc.com/1.0/vehicles.json?agencies=100").read | |
data = JSON.parse(vehicles_data)["data"]["100"] | |
proper_route = data.collect { |x| x["route_id"] == "#{ROUTE}" ? x : nil}.compact[0] | |
end | |
class Stop | |
attr_accessor :name, :latitude, :longitude | |
def initialize args | |
args.each do |k, v| | |
instance_variable_set("@#{k}", v) unless v.nil? | |
end | |
end | |
def arrived? | |
vehicle_data = get_data ROUTE | |
(vehicle_data["location"]["lat"] - self.latitude).abs < ERROR and (vehicle_data["location"]["lng"] - self.longitude).abs < ERROR | |
end | |
end | |
# Load em up, stopify, collect | |
stops = YAML::load(File.open('central.yml')).collect {|s| Stop.new(s) } | |
# And a redis server for the data | |
redis = Redis.new | |
stop_number = 0 | |
# wait for the bus to reach the initial stop | |
puts "Waiting to begin the magical journey (ie for the bus to reach a stop)" | |
while !stops[stop_number].arrived? | |
sleep 1 | |
end | |
while true | |
start_route_time = Time.now | |
until stops[stop_number+1].arrived? | |
puts "... Been traveling for #{(Time.now - start_route_time).to_i} seconds" | |
sleep 1 | |
end | |
route_time = Time.now - start_route_time | |
puts "Bus made it to the next stop" | |
unless stop_number == 0 | |
redis.set "#{stop_number}", JSON.parse(redis.get "#{stop_number}") << route_time | |
else redis.set "#{stop_number}", [route_time].to_json | |
end | |
stop_number = (stop_number + 1)%stops.count | |
end |
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This and all my other work on transloc api has been moved here https://github.com/paulkaplan/Transloc