net/imap: Revert read_tiemout in r58549.

get_response is called in a receiver thread, so there may be no pending
commands when get_response is called.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@58680 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

lib/net/imap.rb

@@ -227,11 +227,6 @@ module Net
     # it raises a Net::OpenTimeout exception. The default value is 30 seconds.
     attr_reader :open_timeout
 
-    # Seconds to wait until reading one block (by one read(1) call).
-    # If the IMAP object cannot complete a read() within this time,
-    # it raises a Net::ReadTimeout exception. The default value is 60 seconds.
-    attr_reader :read_timeout
-
     # The thread to receive exceptions.
     attr_accessor :client_thread
 
@@ -1061,7 +1056,6 @@ module Net
     #         If options[:ssl] is a hash, it's passed to
     #         OpenSSL::SSL::SSLContext#set_params as parameters.
     # open_timeout:: Seconds to wait until a connection is opened
-    # read_timeout:: Seconds to wait until reading one block
     #
     # The most common errors are:
     #
@@ -1091,7 +1085,6 @@ module Net
       @tag_prefix = "RUBY"
       @tagno = 0
       @open_timeout = options[:open_timeout] || 30
-      @read_timeout = options[:read_timeout] || 60
       @parser = ResponseParser.new
       @sock = tcp_socket(@host, @port)
       begin
@@ -1222,35 +1215,14 @@ module Net
       end
     end
 
-    def get_response_data(length, terminator = nil)
-      str = nil
-      buff = String.new
-      while true
-        str = @sock.read_nonblock(length, :exception => false)
-        case str
-        when :wait_readable
-          @sock.to_io.wait_readable(@read_timeout) or
-            raise Net::ReadTimeout, "#{@host}:#{@port} read timeout (exceeds #{@read_timeout} seconds)"
-        when nil
-          break
-        else
-          buff.concat(str)
-          if terminator ? buff.include?(terminator) : (buff.length >= length)
-            break
-          end
-        end
-      end
-      buff
-    end
-
     def get_response
       buff = String.new
       while true
-        s = get_response_data(1, CRLF)
+        s = @sock.gets(CRLF)
-        break if s.length == 0
+        break unless s
         buff.concat(s)
         if /\{(\d+)\}\r\n/n =~ s
-          s = get_response_data($1.to_i)
+          s = @sock.read($1.to_i)
           buff.concat(s)
         else
           break