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#
# Weather plugin for rbot
# by MrChucho (mrchucho@mrchucho.net)
# Copyright (C) 2006 Ralph M. Churchill
#
require 'open-uri'
require 'rexml/document'
class CurrentConditions
def initialize(station)
@station = station
@url = "http://www.nws.noaa.gov/data/current_obs/#{@station.upcase}.xml"
@etag = String.new
@mtime = Time.mktime(0)
@current_conditions = String.new
@iscached = false
end
def update
begin
open(@url,"If-Modified-Since" => @mtime.rfc2822) do |feed|
# open(@url,"If-None-Match"=>@etag) do |feed|
@etag = feed.meta['etag']
@mtime = feed.last_modified
cc_doc = (REXML::Document.new feed).root
@iscached = false
@current_conditions = parse(cc_doc)
end
rescue OpenURI::HTTPError => e
case e
when /304/:
@iscached = true
when /404/:
raise "Data for #{@station} not found"
else
raise "Error retrieving data: #{e}"
end
end
@current_conditions # +" Cached? "+ ((@iscached) ? "Y" : "N")
end
def parse(cc_doc)
cc = Hash.new
cc_doc.elements.each do |c|
cc[c.name.to_sym] = c.text
end
"At #{cc[:observation_time_rfc822]}, the wind was #{cc[:wind_string]} at #{cc[:location]} (#{cc[:station_id]}). The temperature was #{cc[:temperature_string]}#{heat_index_or_wind_chill(cc)}, and the pressure was #{cc[:pressure_string]}. The relative humidity was #{cc[:relative_humidity]}%. Current conditions are #{cc[:weather]} with #{cc[:visibility_mi]}mi visibility."
end
private
def heat_index_or_wind_chill(cc)
hi = cc[:heat_index_string]
wc = cc[:windchill_string]
if hi != 'NA' then
" with a heat index of #{hi}"
elsif wc != 'NA' then
" with a windchill of #{wc}"
else
""
end
end
end
class MyWeatherPlugin < Plugin
def help(plugin, topic="")
"weather <STATION> => display the current conditions at the location specified by the STATION code [Lookup your STATION code at http://www.nws.noaa.gov/data/current_obs/ - this will also store the STATION against your nick, so you can later just say \"weather\", weather => display the current weather at the location you last asked for"
end
def initialize
super
# this plugin only wants to store strings
class << @registry
def store(val)
val
end
def restore(val)
val
end
end
@cc_cache = Hash.new
end
def describe(m, where)
if @cc_cache.has_key?(where) then
met = @cc_cache[where]
else
met = CurrentConditions.new(where)
end
if met
begin
m.reply met.update
@cc_cache[where] = met
rescue => e
m.reply e.message
end
else
m.reply "couldn't find weather data for #{where}"
end
end
def weather(m, params)
if params[:where]
@registry[m.sourcenick] = params[:where]
describe(m,params[:where])
else
if @registry.has_key?(m.sourcenick)
where = @registry[m.sourcenick]
describe(m,where)
else
m.reply "I don't know where you are yet! Lookup your station at http://www.nws.noaa.gov/data/current_obs/ and tell me 'weather <station>', then I'll know."
end
end
end
end
plugin = MyWeatherPlugin.new
plugin.map 'weather :where', :defaults => {:where => false}
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