Class: OCTranspo

Inherits:
Object
  • Object
show all
Defined in:
lib/octranspo_fetch.rb

Instance Method Summary collapse

Constructor Details

#initialize(options) ⇒ OCTranspo

Create a new OCTranspo

Arguments:

options[:application_id]: (String) Your application ID, assigned by OC Transpo.
options[:application_key]: (String) Your application key, assigned by OC Transpo.



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# File 'lib/octranspo_fetch.rb', line 15

def initialize(options)
    @app_id = options[:application_id]
    @app_key = options[:application_key]
    @next_trips_cache = LruRedux::Cache.new(NEXT_TRIPS_CACHE_SIZE)
    @route_summary_cache = LruRedux::Cache.new(ROUTE_CACHE_SIZE)
    @api_calls = 0
    @cache_hits = 0
    @cache_misses = 0
end

Instance Method Details

#cache_stats ⇒ Object 



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# File 'lib/octranspo_fetch.rb', line 35

def cache_stats()
    return {hits: @cache_hits, misses: @cache_misses}
end

#clear_cache ⇒ Object 



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# File 'lib/octranspo_fetch.rb', line 25

def clear_cache()
    @next_trips_cache.clear()
    @route_summary_cache.clear()
end

#get_next_trips_for_stop(stop, route_no, options = {}) ⇒ Object

Get the next three trips for the given stop. Note this may return data for the same route number in multiple headings.

Arguments:

stop: (String) The stop number.
route_no: (String) The route number.
options[:max_cache_time]: (Integer) Maximum cache age, in seconds.  If cached data is
  available and is newer than this, then the cached value will be returned.  Defaults
  to five minutes.



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# File 'lib/octranspo_fetch.rb', line 98

def get_next_trips_for_stop(stop, route_no, options={})
    max_cache_time = (options[:max_cache_time] or 60*5)

    # Return result from cache, if available
    cache_key = "#{stop}-#{route_no}"
    cached_result = @next_trips_cache[cache_key]
    if !cached_result.nil? and ((cached_result[:time] + max_cache_time) > Time.now.to_i)
        @cache_hits += 1
        return adjust_cached_trip_times(cached_result[:next_trips])
    end
    @cache_misses += 1

    xresult = fetch "GetNextTripsForStop", "stopNo=#{stop}&routeNo=#{route_no}"

    result = {
        stop: get_value(xresult, "t:StopNo"),
        stop_description: get_value(xresult, "t:StopLabel"),
        time: Time.now,
        routes: []
    }

    found_data = false

    xresult.xpath('t:Route/t:RouteDirection', OCT_NS).each do |route|
        get_error(route, "Error for route: #{route_no}")

        route_obj = {
            cached: false,
            route: get_value(route, "t:RouteNo"),
            route_label: get_value(route, "t:RouteLabel"),
            direction: get_value(route, "t:Direction"),
            request_processing_time: Time.parse(get_value(route, "t:RequestProcessingTime")),
            trips: []
        }
        route.xpath('t:Trips/t:Trip', OCT_NS).each do |trip|
            route_obj[:trips].push({
                destination: get_value(trip, "t:TripDestination"), # e.g. "Barhaven"
                start_time: get_value(trip, "t:TripStartTime"), # e.g. "14:25" TODO: parse to time
                adjusted_schedule_time: get_value(trip, "t:AdjustedScheduleTime").to_i, # Adjusted schedule time in minutes
                adjustment_age: get_value(trip, "t:AdjustmentAge").to_f, # Time since schedule was adjusted in minutes
                last_trip: (get_value(trip, "t:LastTripOfSchedule") == "true"),
                bus_type: get_value(trip, "t:BusType"),
                gps_speed: get_value(trip, "t:GPSSpeed").to_f,
                latitude: get_value(trip, "t:Latitude").to_f,
                longitude: get_value(trip, "t:Longitude").to_f
            })
        end

        if route_obj[:trips].length != 0
            # Assume that if any trips are filled in, then all the trips will be filled in?
            # Is this a safe assumption?
            found_data = true
        end

        result[:routes].push route_obj
    end

    # Sometimes OC Transpo doesn't return any data for a route, even though it should.  When
    # this happens, if we have cached data, we use that, even if it's slightly stale.
    if !found_data and !cached_result.nil? and (get_trip_count(cached_result[:next_trips]) > 0)
        # Use the cached data, even if it's stale
        result = adjust_cached_trip_times(cached_result[:next_trips])
    else
        @next_trips_cache[cache_key] = {
            next_trips: result,
            time: Time.now.to_i
        }
    end


    return result
end

#get_route_summary_for_stop(stop, options = {}) ⇒ Object

Get a list of routes for a specific stop.

Returns a stop_description, routes: [{route, direction_id, direction, heading]} object. Note that route data is cached.

Arguments:

stop: (String) The stop number.
options[:max_cache_time]: (Integer) Maximum cache age, in seconds.  If cached data is
  available and is newer than this, then the cached value will be returned.  Defaults to
  one day.



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# File 'lib/octranspo_fetch.rb', line 50

def get_route_summary_for_stop(stop, options={})
    max_cache_time = (options[:max_cache_time] or 60*60*24)
    cached_result = @route_summary_cache[stop]
    if !cached_result.nil? and ((cached_result[:time] + max_cache_time) > Time.now.to_i)
        @cache_hits += 1
        return cached_result[:route_summary]
    end
    @cache_misses += 1

    xresult = fetch "GetRouteSummaryForStop", "stopNo=#{stop}"

    result = {
        stop: get_value(xresult, "t:StopNo"),
        stop_description: get_value(xresult, "t:StopDescription"),
        routes: []
    }

    xresult.xpath('t:Routes/t:Route', OCT_NS).each do |route|
        result[:routes].push({
            route: get_value(route, "t:RouteNo"),
            direction_id: get_value(route, "t:DirectionID"),
            direction: get_value(route, "t:Direction"),
            heading: get_value(route, "t:RouteHeading")
        })
    end

    if result[:routes].length == 0
        raise "No routes found"
    end

    @route_summary_cache[stop] = {
        route_summary: result,
        time: Time.now.to_i
    }

    return result
end

#requests ⇒ Object

Returns the number of API calls made by this instance since it was created.



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# File 'lib/octranspo_fetch.rb', line 31

def requests()
    return @api_calls
end

#simple_get_next_trips_for_stop(stop, route_nos = nil, route_label = nil) ⇒ Object

Returns an array of ‘stop_description, route_no, route_label, direction, arrival_in_minutes, …` objects.

... is any data that would be available from a trip object from ‘get_next_trips_for_stop()` (e.g. gps_speed, latitude, longitude, etc…) Returned results are sorted in ascending arrival time.

Arguments:

stop: (String) The stop number.
route_nos: ([String]) can be a single route number, or an array of route numbers, or nil.
    If nil, then this method will call get_route_summary_for_stop to get a list of routes.
route_label: (String) If "route_label" is supplied, then only trips with a matching
    route_label will be returned.



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# File 'lib/octranspo_fetch.rb', line 185

def simple_get_next_trips_for_stop(stop, route_nos=nil, route_label=nil)
    answer = []
    if route_nos.nil?
        route_summary = get_route_summary_for_stop(stop)
        route_nos = route_summary[:routes].map { |e| e[:route] }

    elsif !route_nos.kind_of?(Array)
        route_nos = [route_nos] end

    route_nos.uniq.each do |route_no|
        oct_result = get_next_trips_for_stop stop, route_no
        oct_result[:routes].each do |route|
            if route_label.nil? or (route[:route_label] == route_label)
                route[:trips].each do |trip|
                    answer.push(trip.merge({
                        stop: oct_result[:stop],
                        stop_description: oct_result[:stop_description],
                        route_no: route[:route],
                        route_label: route[:route_label],
                        direction: route[:direction],
                        arrival_in_minutes: trip[:adjusted_schedule_time],
                        live: (trip[:adjustment_age] > 0)
                    }))
                end
            end
        end
    end

    answer.sort! { |a,b| a[:arrival_in_minutes] <=> b[:arrival_in_minutes] }

    return answer
end