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require "fakeredis/geo_set"
module FakeRedis
module GeoCommands
DISTANCE_UNITS = {
"m" => 1,
"km" => 1000,
"ft" => 0.3048,
"mi" => 1609.34
}
REDIS_DOUBLE_PRECISION = 4
REDIS_GEOHASH_SIZE = 10
def geoadd(key, *members)
raise_argument_error("geoadd") if members.empty? || members.size % 3 != 0
set = (data[key] ||= GeoSet.new)
prev_size = set.size
members.each_slice(3) do |member|
set.add(*member)
end
set.size - prev_size
end
def geodist(key, member1, member2, unit = "m")
unit = unit.to_s
raise_command_error("ERR unsupported unit provided. please use #{DISTANCE_UNITS.keys.join(', ')}") unless DISTANCE_UNITS.include?(unit)
set = (data[key] || GeoSet.new)
point1 = set.get(member1)
point2 = set.get(member2)
if point1 && point2
distance = point1.distance_to(point2)
distance_in_units = distance / DISTANCE_UNITS[unit]
distance_in_units.round(REDIS_DOUBLE_PRECISION).to_s
end
end
def geohash(key, member)
members = Array(member)
raise_argument_error("geohash") if members.empty?
set = (data[key] || GeoSet.new)
members.map do |member|
point = set.get(member)
point.geohash(REDIS_GEOHASH_SIZE) if point
end
end
def geopos(key, member)
return nil unless data[key]
members = Array(member)
set = (data[key] || GeoSet.new)
members.map do |member|
point = set.get(member)
[point.lon.to_s, point.lat.to_s] if point
end
end
def georadius(*args)
args = args.dup
raise_argument_error("georadius") if args.size < 5
key, lon, lat, radius, unit, *rest = args
raise_argument_error("georadius") unless DISTANCE_UNITS.has_key?(unit)
radius *= DISTANCE_UNITS[unit]
set = (data[key] || GeoSet.new)
center = GeoSet::Point.new(lon, lat, nil)
do_georadius(set, center, radius, unit, rest)
end
def georadiusbymember(*args)
args = args.dup
raise_argument_error("georadiusbymember") if args.size < 4
key, member, radius, unit, *rest = args
raise_argument_error("georadiusbymember") unless DISTANCE_UNITS.has_key?(unit)
radius *= DISTANCE_UNITS[unit]
set = (data[key] || GeoSet.new)
center = set.get(member)
raise_command_error("ERR could not decode requested zset member") unless center
do_georadius(set, center, radius, unit, args)
end
private
def do_georadius(set, center, radius, unit, args)
points = set.points_within_radius(center, radius)
options = georadius_options(args)
if options[:asc]
points.sort_by! { |p| p.distance_to(center) }
elsif options[:desc]
points.sort_by! { |p| -p.distance_to(center) }
end
points = points.take(options[:count]) if options[:count]
extras = options[:extras]
return points.map(&:name) if extras.empty?
points.map do |point|
member = [point.name]
extras.each do |extra|
case extra
when "WITHCOORD"
member << [point.lon.to_s, point.lat.to_s]
when "WITHDIST"
distance = point.distance_to(center)
distance_in_units = distance / DISTANCE_UNITS[unit]
member << distance_in_units.round(REDIS_DOUBLE_PRECISION).to_s
when "WITHHASH"
member << point.geohash(REDIS_GEOHASH_SIZE)
end
end
member
end
end
def georadius_options(args)
options = {}
args = args.map { |arg| arg.to_s.upcase }
if idx = args.index("COUNT")
options[:count] = Integer(args[idx + 1])
end
options[:asc] = true if args.include?("ASC")
options[:desc] = true if args.include?("DESC")
extras = args & ["WITHCOORD", "WITHDIST", "WITHHASH"]
options[:extras] = extras
options
end
end
end
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