Fix tile expiry

[chef.git] / cookbooks / tile / files / default / ruby / expire.rb

diff --git a/cookbooks/tile/files/default/ruby/expire.rb b/cookbooks/tile/files/default/ruby/expire.rb
index 7757386c5902272475f387fc1149d1a16279e72c..d695a0bc53de611f3a752fe424292ee1dc3bf560 100755 (executable)
--- a/cookbooks/tile/files/default/ruby/expire.rb
+++ b/cookbooks/tile/files/default/ruby/expire.rb
@@ -1,11 +1,10 @@
 #!/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"
 
 module Expire
   # projection object to go from latlon -> spherical mercator
@@ -50,8 +49,8 @@ module Expire
     # generate the path
     hash_path = (0..4).collect do |i|
       (((x >> 4 * i) & 0xf) << 4) | ((y >> 4 * i) & 0xf)
-    end.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
@@ -102,17 +101,17 @@ module Expire
 
     # 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
@@ -124,18 +123,19 @@ module Expire
     # 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
+    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]
+      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
+    node_cache.close
 
     # create a set of all the tiles at the maximum zoom level which are touched by
     # any of the nodes we've collected. we'll create the tiles at other zoom levels
@@ -164,12 +164,17 @@ module Expire
 
     # open the cache
     def initialize(filename)
-      @cache = Mmap.new(filename)
+      @cache = File.new(filename, "r")
 
-      throw "Unexpected format" unless @cache[0..3].unpack("l").first == 1
-      throw "Unexpected ID size" unless @cache[4..7].unpack("l").first == 8
+      throw "Unexpected format" unless @cache.sysread(4).unpack("l").first == 1
+      throw "Unexpected ID size" unless @cache.sysread(4).unpack("l").first == 8
 
-      @max_id = @cache[8..15].unpack("q").first
+      @max_id = @cache.sysread(8).unpack("q").first
+    end
+
+    # close the cache
+    def close
+      @cache.close
     end
 
     # lookup a node
@@ -177,7 +182,9 @@ module Expire
       if id <= @max_id
         offset = 16 + id * 8
 
-        lon, lat = @cache[offset..offset + 7].unpack("ll")
+        @cache.sysseek(offset)
+
+        lon, lat = @cache.sysread(8).unpack("ll")
 
         if lon != -2147483648 && lat != -2147483648
           node = Node.new(lon, lat)