RUBY-429 rescue and raise appropriate errors

lib/mongo/util/node.rb

@@ -45,7 +45,7 @@ module Mongo
         else
           socket.setsockopt(Socket::IPPROTO_TCP, Socket::TCP_NODELAY, 1)
         end
-      rescue OperationTimeout, OperationFailure, SocketError, SystemCallError, IOError => ex
+      rescue OperationTimeout, ConnectionFailure, OperationFailure, SocketError, SystemCallError, IOError => ex
         @connection.log(:debug, "Failed connection to #{host_string} with #{ex.class}, #{ex.message}.")
         socket.close if socket
         return nil

lib/mongo/util/tcp_socket.rb

@@ -60,8 +60,14 @@ module Mongo
 
     def read(maxlen, buffer)
       # Block on data to read for @op_timeout seconds
-      if IO.select([@socket], nil, nil, @op_timeout)
+      if IO.select([@socket], nil, [@socket], @op_timeout)
-        @socket.readpartial(maxlen, buffer)
+        begin
+          @socket.readpartial(maxlen, buffer)
+        rescue EOFError
+          return ConnectionError
+        rescue Errno::ECONNRESET
+          raise ConnectionFailure 
+        end
       else
         raise OperationTimeout
       end