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#
# Forecast plugin for rbot
# by MrChucho (mrchucho@mrchucho.net)
# Copyright (C) 2006 Ralph M. Churchill
#
require 'soap/wsdlDriver'
require 'open-uri'
require 'rexml/document'
require 'erb'
class LatLong
include ERB::Util
# Determine the latitude and longitude of a location. City, State and/or ZIP
# are all valid.
# [+return+] latitude,longitude
def get_lat_long(loc)
loc = url_encode(loc)
url="http://api.local.yahoo.com/MapsService/V1/geocode?appid=mrchucho_rbot_weather&location=#{loc}"
lat,long = 0,0
begin
open(url) do |xmldoc|
results = (REXML::Document.new xmldoc).root
lat = results.elements["//Latitude/text()"].to_s
long = results.elements["//Longitude/text()"].to_s
end
rescue => err
raise err #?
end
return lat.to_f,long.to_f
end
end
class Forecast
WSDL_URI="http://www.nws.noaa.gov/forecasts/xml/SOAP_server/ndfdXMLserver.php?wsdl"
def initialize(lat,long)
@lat,@long=lat,long
# this extra step is for backward/forward compatibility
factory = SOAP::WSDLDriverFactory.new(WSDL_URI)
@forecaster=factory.respond_to?(:create_rpc_driver) ?
factory.create_rpc_driver : factory.create_driver
end
def forecast
return parse(retrieve),Time.new
end
private
def retrieve
forecast = @forecaster.NDFDgenByDay(
@lat,@long,Time.now.strftime("%Y-%m-%d"),2,"24 hourly")
(REXML::Document.new(forecast)).root
end
def parse(xml)
msg = String.new
(1..2).each do |day|
d = (day==1) ? 'Today' : 'Tomorrow'
hi = xml.elements["//temperature[@type='maximum']/value[#{day}]/text()"]
lo = xml.elements["//temperature[@type='minimum']/value[#{day}]/text()"]
w = xml.elements["//weather/weather-conditions[#{day}]/@weather-summary"]
precip_am = xml.elements["//probability-of-precipitation/value[#{day*2-1}]/text()"]
precip_pm = xml.elements["//probability-of-precipitation/value[#{day*2}]/text()"]
msg += "#{d}: Hi #{hi} Lo #{lo}, #{w}. Precip: AM #{precip_am}% PM #{precip_pm}%\n"
end
msg
end
end
class ForecastPlugin < Plugin
USAGE='forecast <location> => show the 2-day forecast for a location. Location can be any combination of City, State, Country and ZIP'
def help(plugin,topic="")
USAGE
end
def usage(m,params={})
m.reply USAGE
end
def initialize
super
# this plugin only wants to store strings
class << @registry
def store(val)
val
end
def restore(val)
val
end
end
@forecast_cache = Hash.new
end
def forecast(m,params)
if params[:location] and params[:location].any?
loc = params[:location].join
@registry[m.sourcenick] = loc
get_forecast(m,loc)
else
if @registry.has_key?(m.sourcenick) then
loc = @registry[m.sourcenick]
get_forecast(m,loc)
else
m.reply "Please specifiy the City, State or ZIP"
end
end
end
def get_forecast(m,loc)
begin
if @forecast_cache.has_key?(loc) and
Time.new - @forecast_cache[loc][:date] < 3600
forecast = @forecast_cache[loc][:forecast]
forecast_date = @forecast_cache[loc][:date]
else
begin
l = LatLong.new
f = Forecast.new(*l.get_lat_long(loc))
forecast,forecast_date = f.forecast
rescue => err
m.reply err
end
end
if forecast
m.reply forecast
@forecast_cache[loc] = {}
@forecast_cache[loc][:forecast] = forecast
@forecast_cache[loc][:date] = forecast_date
else
m.reply "Couldn't find forecast for #{loc}"
end
rescue => e
m.reply "ERROR: #{e}"
end
end
end
plugin = ForecastPlugin.new
plugin.map 'forecast *location', :defaults => {:location => false}
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