Move caching of reverse geocodes to describe_location

[rails.git] / lib / nominatim.rb

diff --git a/lib/nominatim.rb b/lib/nominatim.rb
new file mode 100644 (file)
index 0000000..5b1c7ac
--- /dev/null
+++ b/lib/nominatim.rb
@@ -0,0 +1,24 @@
+module Nominatim
+  def self.describe_location(lat, lon, zoom = nil, language = nil)
+    zoom = zoom || 14
+    language = language || request.user_preferred_languages.join(',')
+
+    Rails.cache.fetch "/nominatim/location/#{lat}/#{lon}/#{zoom}/#{language}" do
+      url = "http://nominatim.openstreetmap.org/reverse?lat=#{lat}&lon=#{lon}&zoom=#{zoom}&accept-language=#{language}"
+
+      begin
+        response = OSM::Timer.timeout(4) do
+          REXML::Document.new(Net::HTTP.get(URI.parse(url)))
+        end
+      rescue Exception
+        response = nil
+      end
+
+      if response and result = response.get_text("reversegeocode/result")
+        result.to_s
+      else
+        "#{number_with_precision(lat, :precision => 3)}, #{number_with_precision(lon, :precision => 3)}"
+      end
+    end
+  end
+end