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110 lines
2.5 KiB
110 lines
2.5 KiB
require 'csv'
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require 'redis/connection/hiredis'
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require 'redis'
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require 'logger'
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require 'open-uri'
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class Earthquakes
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DATA_URL = 'http://earthquake.usgs.gov/earthquakes/catalogs/eqs7day-M1.txt'
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attr_accessor :id_set, :region_set, :magnitude_set
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def initialize
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@redis = Redis.new
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@id_set = 'earthquake-ids'
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@region_set = 'earthquake-regions'
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@magnitude_set = 'earthquake-magnitudes'
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@logger = Logger.new(STDOUT)
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@logger.formatter = proc do |severity, datetime, progname, msg|
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"#{datetime}: #{msg}\n"
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end
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end
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def get_info(earthquake_id)
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@redis.hgetall(with_prefix(earthquake_id, 'eqid'))
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end
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def in_region(region)
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@redis.smembers(with_prefix(region, 'eqregion'))
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end
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def with_magnitude(magnitude)
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@redis.smembers(with_prefix(magnitude, 'eqmagnitude'))
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end
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def all_ids
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@redis.smembers(@id_set).map { |i| sans_prefix(i, 'eqid') }
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end
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def all_regions
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@redis.smembers(@region_set).map { |r| sans_prefix(r, 'eqregion') }
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end
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def all_magnitudes
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@redis.smembers(@magnitude_set).map { |m| sans_prefix(m, 'eqmagnitude') }
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end
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def drop_all
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@logger.info('Removing data for each earthquake')
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all_ids.each do |i|
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@logger.info("Removing data for earthquake #{sans_prefix(i, 'eqid')}")
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@redis.del(i)
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end
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@logger.info('Removing earthquake id set')
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@redis.del(@id_set)
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@logger.info('Removing earthquake region set')
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@redis.del(@region_set)
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@logger.info('Removing earthquake magnitude set')
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@redis.del(@magnitude_set)
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end
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def load_data
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data = CSV.parse(
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open(DATA_URL).read, :headers => true, :header_converters => [:symbol]
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)
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data.each do |row|
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@redis.multi do |r|
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@logger.info("Adding earthquake #{row[:eqid]}")
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id_key = with_prefix(row[:eqid].downcase, 'eqid')
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r.sadd(@id_set, id_key)
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row.headers.each do |header|
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r.hset(id_key, header.downcase, row[header].downcase)
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end
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region_key = with_prefix(row[:region].downcase, 'eqregion')
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r.sadd(region_key, id_key)
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r.sadd(@region_set, region_key)
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magnitude_key = with_prefix(row[:magnitude], 'eqmagnitude')
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r.sadd(magnitude_key, id_key)
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r.sadd(@magnitude_set, magnitude_key)
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end
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end
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end
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private
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def with_prefix(key, prefix)
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if not /^#{prefix}:/.match(key)
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return "#{prefix}:#{key}"
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end
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key
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end
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def sans_prefix(key, prefix)
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key.gsub(/^#{prefix}:/, '')
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end
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end
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if $0 == __FILE__
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Earthquakes.new.send(ARGV.first)
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end
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