implement iqdb wrapper

app/logical/iqdb/server.rb

@@ -0,0 +1,56 @@
+module Iqdb
+  class Server
+    FLAG_SKETCH = 0x01
+    FLAG_GRAYSCALE = 0x02
+    FLAG_WIDTH_AS_SET = 0x08
+    FLAG_DISCARD_COMMON_COEFFS = 0x16
+
+    attr_reader :hostname, :port
+
+    def self.import(database)
+      IO.popen("iqdb #{database}", "w") do |io|
+        Post.find_each do |post|
+          puts "Adding #{post.id}"
+          io.puts "#{post.id.to_s(16)} :#{post.preview_file_path}"
+        end
+      end
+    end
+
+    def self.add(database, image_id, filename)
+      image_id_hex = image_id.to_s(16)
+      `iqdb add #{database} #{image_id_hex} :#{filename}`
+    end
+
+    def self.remove(database, image_id)
+      image_id_hex = image_id.to_s(16)
+      `iqdb remove 0 #{image_id_hex} #{database}`
+    end
+
+    def initialize(hostname, port)
+      @hostname = hostname
+      @port = port
+    end
+
+    def open
+      @socket = TCPSocket.new(hostname, port)
+    end
+
+    def close
+      @socket.close
+    end
+
+    def request
+      open
+      yield
+    ensure
+      close
+    end
+
+    def query(dbid, results, filename, flags = FLAG_DISCARD_COMMON_COEFFS)
+      request do
+        @socket.puts "query #{dbid} #{flags} #{results} #{filename}"
+        responses = Responses::Collection.new(@socket.read)
+      end
+    end
+  end
+end