[thrift] iolists and binaries in Erlang

Summary: three related changes:
 * for numeric types in tBinaryProtocol call effectful_write with binary(), not [char()]
 * tBinaryProtocol:writeString now takes either [char()], iolist(), or binary() ... now you can use any of the three where a Thrift string is required
 * tBufferedTransport now buffers by building an iolist() rather than Buffer++Data.  zomg.

Reviewed By: eletuchy

Test Plan: everything seems to work as usual, and binary() works as expected

Revert Plan: ok


git-svn-id: https://svn.apache.org/repos/asf/incubator/thrift/trunk@665447 13f79535-47bb-0310-9956-ffa450edef68
diff --git a/lib/erl/src/transport/tBufferedTransport.erl b/lib/erl/src/transport/tBufferedTransport.erl
index 18d9af9..2b3e0aa 100644
--- a/lib/erl/src/transport/tBufferedTransport.erl
+++ b/lib/erl/src/transport/tBufferedTransport.erl
@@ -72,9 +72,9 @@
     Transport = oop:get(This, transport),
     ?R1(Transport, read, Sz).
 
-effectful_write(This, Buf) -> % be sure to rebind This to the retval
+effectful_write(This, Data) -> % be sure to rebind This to the retval
     Wbuf = oop:get(This, wbuf),
-    This1 = oop:set(This, wbuf, Wbuf++Buf), % TODO: ++ efficiency?
+    This1 = oop:set(This, wbuf, [Wbuf, Data]), % build an iolist()
     {ok, This1}.
 
 effectful_flush(This) ->
@@ -82,5 +82,5 @@
     Transport = oop:get(This, transport),
     ?R1(Transport, effectful_write, Wbuf),
     ?R0(Transport, effectful_flush),
-    This1 = oop:set(This, wbuf, ""),
+    This1 = oop:set(This, wbuf, []),
     {ok, This1}.
diff --git a/lib/erl/src/transport/tSocket.erl b/lib/erl/src/transport/tSocket.erl
index 1792893..f23cdee 100644
--- a/lib/erl/src/transport/tSocket.erl
+++ b/lib/erl/src/transport/tSocket.erl
@@ -85,16 +85,10 @@
 isOpen(This) ->
     oop:get(This, handle) /= nil.
 
-effectful_write(This, Str) ->
+effectful_write(This, Data) ->
     Handle = oop:get(This, handle),
-    Val = gen_tcp:send(Handle, Str),
 
-    %% DEBUG
-    %% error_logger:info_msg("tSocket: wrote ~p~n", [Str]),
-
-    %% error_logger:info_msg("WRITE |~p| (~p)", [Str,Val]),
-
-    case Val of
+    case gen_tcp:send(Handle, Data) of
         {error, _} ->
             tException:throw(tTransportException, [?tTransportException_NOT_OPEN, "in write"]);
         ok ->