Created
January 2, 2011 19:45
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OC Transpo GPS API access in Ruby
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require 'open-uri' | |
require 'nokogiri' | |
require 'active_support/time' | |
module OCTranspo | |
class GPSData | |
API_URL = 'http://octranspo.opendataottawa.ca' | |
API_KEY = 'YOUR API KEY HERE' | |
def initialize(stop) | |
@stop = stop | |
end | |
def trips(count = 3) | |
url = "#{API_URL}/stop/#{@stop}/trips?count=#{count}&key=#{API_KEY}" | |
doc = Nokogiri::XML(open(url)) | |
trips = {} | |
doc.xpath('//xmlns:StopNextTripData', 'xmlns' => 'http://tempuri.org/').each do |trip| | |
route = get_el(trip, 'ROUTE_NO').to_i | |
direction = get_el(trip, 'DIRECTION') | |
trips[route] ||= {} | |
trips[route][direction[0,1]] ||= [] | |
trip_details = { | |
:route => route, | |
:description => get_el(trip, 'ROUTE_DESCRIPTION').gsub(/\s?[\/\\-]+\s?/, '/'), | |
:direction => direction, | |
:live => get_el(trip, 'GPS_AVAILABLE') == 'true', | |
:last_trip => get_el(trip, 'LAST_TRIP') == 'true' | |
} | |
scheduled_seconds = get_el(trip, 'SCHEDULED_SECONDS').to_i | |
trip_details[:scheduled_arrival] = seconds_to_time(scheduled_seconds) | |
if trip_details[:live] | |
trip_details.merge!({ | |
:latitude => get_el(trip, 'LATITUDE').to_f, | |
:longitude => get_el(trip, 'LONGITUDE').to_f, | |
:estimated_arrival => seconds_to_time(scheduled_seconds + get_el(trip, 'ADHERENCE_SECONDS').to_i) | |
}) | |
end | |
trips[route][direction[0,1]] << trip_details | |
end | |
trips | |
end | |
def route_trips(route, count = 3) | |
trips(count)[route.to_i] | |
end | |
def next_route_trip(route, direction = nil) | |
trips = route_trips(route, 1) | |
flattened_trips = direction ? trips[direction.upcase] : trips.to_a.flatten.select { |e| e.is_a?(Hash) } | |
flattened_trips.sort { |a,b| (a[:estimated_arrival] || a[:scheduled_arrival]) <=> | |
(b[:estimated_arrival] || b[:scheduled_arrival]) }.first | |
end | |
private | |
def seconds_to_time(seconds) | |
ActiveSupport::TimeZone['America/Toronto'].now.midnight + (seconds.to_i % 86400) | |
end | |
def get_el(node, el) | |
node.at_xpath('xmlns:' + el, 'xmlns' => 'http://tempuri.org/').content | |
end | |
end | |
end |
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