#!/usr/bin/ruby
-require 'rubygems'
-require 'proj4'
-require 'xml/libxml'
-require 'set'
-require 'time'
-require 'mmap'
+require "rubygems"
+require "proj4"
+require "xml/libxml"
+require "set"
+require "time"
+require "mmap"
module Expire
# projection object to go from latlon -> spherical mercator
NODE_CACHE_FILE = "/store/database/nodes"
# turns a spherical mercator coord into a tile coord
- def Expire.tile_from_merc(point, zoom)
+ def self.tile_from_merc(point, zoom)
# renormalise into unit space [0,1]
point.x = 0.5 + point.x / SIZE
point.y = 0.5 - point.y / SIZE
end
# turns a latlon -> tile x,y given a zoom level
- def Expire.tile_from_latlon(latlon, zoom)
+ def self.tile_from_latlon(latlon, zoom)
# first convert to spherical mercator
point = PROJ.forward(latlon)
tile_from_merc(point, zoom)
end
# this must match the definition of xyz_to_meta in mod_tile
- def Expire.xyz_to_meta(x, y, z)
+ def self.xyz_to_meta(x, y, z)
# mask off the final few bits
x &= ~(METATILE - 1)
y &= ~(METATILE - 1)
# generate the path
- hash_path = (0..4).collect { |i|
+ hash_path = (0..4).collect do |i|
(((x >> 4 * i) & 0xf) << 4) | ((y >> 4 * i) & 0xf)
- }.reverse.join('/')
- z.to_s + '/' + hash_path + ".meta"
+ end.reverse.join("/")
+ z.to_s + "/" + hash_path + ".meta"
end
# time to reset to, some very stupidly early time, before OSM started
EXPIRY_TIME = Time.parse("2000-01-01 00:00:00")
# expire the meta tile by setting the modified time back
- def Expire.expire_meta(meta)
+ def self.expire_meta(meta)
puts "Expiring #{meta}"
File.utime(EXPIRY_TIME, EXPIRY_TIME, meta)
end
- def Expire.expire(change_file, min_zoom, max_zoom, tile_dirs)
+ def self.expire(change_file, min_zoom, max_zoom, tile_dirs)
do_expire(change_file, min_zoom, max_zoom) do |set|
new_set = Set.new
meta_set = Set.new
end
end
- def Expire.do_expire(change_file, min_zoom, max_zoom, &_)
+ def self.do_expire(change_file, min_zoom, max_zoom, &_)
# read in the osm change file
doc = XML::Document.file(change_file)
# hash map to contain all the nodes
- nodes = Hash.new
+ nodes = {}
# we put all the nodes into the hash, as it doesn't matter whether the node was
# added, deleted or modified - the tile will need updating anyway.
- doc.find('//node').each do |node|
- lat = node['lat'].to_f
+ doc.find("//node").each do |node|
+ lat = node["lat"].to_f
if lat < -85
lat = -85
end
if lat > 85
lat = 85
end
- point = Proj4::Point.new(Math::PI * node['lon'].to_f / 180,
+ point = Proj4::Point.new(Math::PI * node["lon"].to_f / 180,
Math::PI * lat / 180)
- nodes[node['id'].to_i] = tile_from_latlon(point, max_zoom)
+ nodes[node["id"].to_i] = tile_from_latlon(point, max_zoom)
end
# now we look for all the ways that have changed and put all of their nodes into
# itself deleted and the coverage of the point set isn't enough to encompass the
# change.
node_cache = NodeCache.new(NODE_CACHE_FILE)
- doc.find('//way/nd').each do |node|
- node_id = node['ref'].to_i
- unless nodes.include? node_id
- # this is a node referenced but not added, modified or deleted, so it should
- # still be in the node cache.
- if entry = node_cache[node_id]
- point = Proj4::Point.new(entry.lon, entry.lat)
- nodes[node_id] = tile_from_merc(point, max_zoom)
- end
+ doc.find("//way/nd").each do |node|
+ node_id = node["ref"].to_i
+
+ next if nodes.include? node_id
+
+ # this is a node referenced but not added, modified or deleted, so it should
+ # still be in the node cache.
+ if (entry = node_cache[node_id])
+ point = Proj4::Point.new(entry.lon, entry.lat)
+ nodes[node_id] = tile_from_merc(point, max_zoom)
end
end