Merge branch 'ia/inets/esi-timeout/OTP-13110' into maint

* ia/inets/esi-timeout/OTP-13110:
  inets: Add warning header in "chunk trailer" when mod_esi callback times out or fails
  inets: Remove exit that generates an incorrect internal server error

10 files changed, 114 insertions, 58 deletions

diff --git a/lib/inets/src/http_lib/http_chunk.erl b/lib/inets/src/http_lib/http_chunk.erl
index 9699856bf8..7325f24809 100644
--- a/lib/inets/src/http_lib/http_chunk.erl
+++ b/lib/inets/src/http_lib/http_chunk.erl
@@ -25,7 +25,7 @@
 -include("http_internal.hrl").
 
 %% API
--export([decode/3, encode/1, encode_last/0, handle_headers/2]).
+-export([decode/3, encode/1, encode_last/0, encode_last/1, handle_headers/2]).
 %% Callback API - used for example if the chunkedbody is received a
 %% little at a time on a socket. 
 -export([decode_size/1, ignore_extensions/1, decode_data/1, decode_trailer/1]).
@@ -85,6 +85,11 @@ encode(Chunk) when is_list(Chunk)->
 encode_last() ->
     <<$0, ?CR, ?LF, ?CR, ?LF >>.
 
+encode_last([]) ->
+    encode_last();
+encode_last(Trailers0) ->
+     Trailers = list_to_binary(encode_trailers(Trailers0)),
+    <<$0, ?CR, ?LF, Trailers/binary>>.
 
 %%-------------------------------------------------------------------------
 %% handle_headers(HeaderRecord, ChunkedHeaders) -> NewHeaderRecord
@@ -276,10 +281,18 @@ decode_trailer(<<?CR, ?LF, Rest/binary>>, Header, Headers, Body, BodyLength, Rem
 		   Body, BodyLength, RemainingSize, TotalMaxHeaderSize);
 decode_trailer(<<Octet, Rest/binary>>, Header, Headers, Body,
 	       BodyLength, RemainingSize, TotalMaxHeaderSize) ->
-    decode_trailer(Rest, [Octet | Header], Headers, 
-		   Body, BodyLength, RemainingSize - 1, TotalMaxHeaderSize).
+    decode_trailer(Rest, [Octet | Header], Headers, 		   
+		   Body, BodyLength, remaing_size(RemainingSize, 1), TotalMaxHeaderSize).
 
 remaing_size(nolimit, _) ->
     nolimit;
 remaing_size(Total, Consumed) ->
     Total - Consumed.
+
+encode_trailers(Trailers) ->
+    encode_trailers(Trailers, "").
+    
+encode_trailers([], Acc) ->
+    Acc ++ ?CRLF ++ ?CRLF;
+encode_trailers([{Header, Value} | Rest], Acc) ->
+    encode_trailers(Rest, Header ++ ":" ++ Value ++ ?CRLF ++ Acc).
diff --git a/lib/inets/src/http_lib/http_response.erl b/lib/inets/src/http_lib/http_response.erl
index d13670700c..42e5dd263d 100644
--- a/lib/inets/src/http_lib/http_response.erl
+++ b/lib/inets/src/http_lib/http_response.erl
@@ -65,6 +65,8 @@ header_list(Headers) ->
 %%%========================================================================
 fill_headers([], _, Headers) ->
     Headers;
+fill_headers([[]], _, Headers) ->
+    Headers;
 fill_headers([[Ch|HeaderFold]|Tail], Folded, Headers)
   when Ch == $\t; Ch == $\s ->
     fill_headers(Tail, [HeaderFold|Folded], Headers);
diff --git a/lib/inets/src/http_server/httpd_example.erl b/lib/inets/src/http_server/httpd_example.erl
index d729affd6d..0222487a4b 100644
--- a/lib/inets/src/http_server/httpd_example.erl
+++ b/lib/inets/src/http_server/httpd_example.erl
@@ -24,7 +24,7 @@
 
 -export([newformat/3]).
 %% These are used by the inets test-suite
--export([delay/1]).
+-export([delay/1, chunk_timeout/3]).
 
 
 print(String) ->
@@ -142,3 +142,11 @@ i(F)   -> i(F,[]).
 i(F,A) -> io:format(F ++ "~n",A).
 
 sleep(T) -> receive after T -> ok end.
+
+%% ------------------------------------------------------
+
+chunk_timeout(SessionID, _, StrInt) ->
+    mod_esi:deliver(SessionID, "Tranfer-Encoding:chunked/html\r\n\r\n"),
+    mod_esi:deliver(SessionID, top("Test chunk encoding timeout")),
+    timer:sleep(20000),
+    mod_esi:deliver(SessionID, footer()).
diff --git a/lib/inets/src/http_server/httpd_request_handler.erl b/lib/inets/src/http_server/httpd_request_handler.erl
index 143d599edb..134576059d 100644
--- a/lib/inets/src/http_server/httpd_request_handler.erl
+++ b/lib/inets/src/http_server/httpd_request_handler.erl
@@ -630,21 +630,10 @@ decrease(N) when is_integer(N) ->
 decrease(N) ->
     N.
 
-error_log(ReasonString, Info) ->
+error_log(ReasonString,  #mod{config_db = ConfigDB}) ->
     Error = lists:flatten(
 	      io_lib:format("Error reading request: ~s", [ReasonString])),
-    error_log(mod_log, Info, Error),
-    error_log(mod_disk_log, Info, Error).
-
-error_log(Mod, #mod{config_db = ConfigDB} = Info, String) ->
-    Modules = httpd_util:lookup(ConfigDB, modules,
-				[mod_get, mod_head, mod_log]),
-    case lists:member(Mod, Modules) of
-	true ->
-	    Mod:error_log(Info, String);
-	_ ->
-	    ok
-    end.
+    httpd_util:error_log(ConfigDB, Error).
 
 
 %%--------------------------------------------------------------------
diff --git a/lib/inets/src/http_server/httpd_response.erl b/lib/inets/src/http_server/httpd_response.erl
index 71243f525a..c0b5f09faf 100644
--- a/lib/inets/src/http_server/httpd_response.erl
+++ b/lib/inets/src/http_server/httpd_response.erl
@@ -20,8 +20,8 @@
 %%
 -module(httpd_response).
 -export([generate_and_send_response/1, send_status/3, send_header/3, 
-	 send_body/3, send_chunk/3, send_final_chunk/2, split_header/2,
-	 is_disable_chunked_send/1, cache_headers/2]).
+	 send_body/3, send_chunk/3, send_final_chunk/2, send_final_chunk/3, 
+	 split_header/2, is_disable_chunked_send/1, cache_headers/2]).
 -export([map_status_code/2]).
 
 -include_lib("inets/src/inets_app/inets_internal.hrl").
@@ -89,8 +89,7 @@ traverse_modules(ModData,[Module|Rest]) ->
 				"~n   Error:       ~p"
 				"~n   Stack trace: ~p",
 				[Module, T, E, ?STACK()])),
-	    report_error(mod_log, ModData#mod.config_db, String),
-	    report_error(mod_disk_log, ModData#mod.config_db, String),
+	    httpd_util:error_log(ModData#mod.config_db, String),
 	    send_status(ModData, 500, none),
 	    done
     end.
@@ -245,7 +244,6 @@ send_chunk(_, <<>>, _) ->
     ok;
 send_chunk(_, [], _) ->
     ok;
-
 send_chunk(#mod{http_version = "HTTP/1.1", 
 		socket_type = Type, socket = Sock}, Response0, false) ->
     Response = http_chunk:encode(Response0),
@@ -254,10 +252,13 @@ send_chunk(#mod{http_version = "HTTP/1.1",
 send_chunk(#mod{socket_type = Type, socket = Sock} = _ModData, Response, _) ->
     httpd_socket:deliver(Type, Sock, Response).
 
+send_final_chunk(Mod, IsDisableChunkedSend) ->
+    send_final_chunk(Mod, [], IsDisableChunkedSend).
+
 send_final_chunk(#mod{http_version = "HTTP/1.1", 
-		      socket_type = Type, socket = Sock}, false) ->
-    httpd_socket:deliver(Type, Sock, http_chunk:encode_last());
-send_final_chunk(#mod{socket_type = Type, socket = Sock}, _) ->
+		      socket_type = Type, socket = Sock}, Trailers, false) ->
+    httpd_socket:deliver(Type, Sock, http_chunk:encode_last(Trailers));
+send_final_chunk(#mod{socket_type = Type, socket = Sock}, _, _) ->
     httpd_socket:close(Type, Sock).
 
 is_disable_chunked_send(Db) ->
@@ -397,16 +398,6 @@ send_response_old(#mod{socket_type = Type,
 content_length(Body)->
     integer_to_list(httpd_util:flatlength(Body)).
 
-report_error(Mod, ConfigDB, Error) ->
-    Modules = httpd_util:lookup(ConfigDB, modules,
-				[mod_get, mod_head, mod_log]),
-    case lists:member(Mod, Modules) of
-	true ->
-	    Mod:report_error(ConfigDB, Error);
-	_ ->
-	    ok
-    end.
-
 handle_headers([], NewHeaders) ->
     {ok, NewHeaders};
 
diff --git a/lib/inets/src/http_server/httpd_util.erl b/lib/inets/src/http_server/httpd_util.erl
index 0387d71911..ab43f0b378 100644
--- a/lib/inets/src/http_server/httpd_util.erl
+++ b/lib/inets/src/http_server/httpd_util.erl
@@ -31,7 +31,7 @@
 	 convert_netscapecookie_date/1, enable_debug/1, valid_options/3,
 	 modules_validate/1, module_validate/1, 
 	 dir_validate/2, file_validate/2, mime_type_validate/1, 
-	 mime_types_validate/1, custom_date/0]).
+	 mime_types_validate/1, custom_date/0, error_log/2]).
 
 -export([encode_hex/1, decode_hex/1]).
 -include_lib("kernel/include/file.hrl").
@@ -776,3 +776,17 @@ do_enable_debug([{Level,Modules}|Rest])
 	    ok
     end,
     do_enable_debug(Rest).
+
+error_log(ConfigDb, Error) ->
+    error_log(mod_log, ConfigDb, Error),
+    error_log(mod_disk_log, ConfigDb, Error).
+	
+error_log(Mod, ConfigDB, Error) ->
+    Modules = httpd_util:lookup(ConfigDB, modules,
+				[mod_get, mod_head, mod_log]),
+    case lists:member(Mod, Modules) of
+	true ->
+	    Mod:report_error(ConfigDB, Error);
+	_ ->
+	    ok
+    end.
diff --git a/lib/inets/src/http_server/mod_esi.erl b/lib/inets/src/http_server/mod_esi.erl
index b9a0797977..1923411449 100644
--- a/lib/inets/src/http_server/mod_esi.erl
+++ b/lib/inets/src/http_server/mod_esi.erl
@@ -376,7 +376,6 @@ erl_scheme_webpage_chunk(Mod, Func, Env, Input, ModData) ->
 	    end),
  
     Response = deliver_webpage_chunk(ModData, Pid), 
-  
     process_flag(trap_exit,false),
     Response.
 
@@ -418,7 +417,6 @@ deliver_webpage_chunk(#mod{config_db = Db} = ModData, Pid, Timeout) ->
 	    ?hdrv("deliver_webpage_chunk - timeout", []),
 	    send_headers(ModData, 504, [{"connection", "close"}]),
 	    httpd_socket:close(ModData#mod.socket_type, ModData#mod.socket),
-	    process_flag(trap_exit,false),
 	    {proceed,[{response, {already_sent, 200, 0}} | ModData#mod.data]}
     end.
 
@@ -446,7 +444,6 @@ send_headers(ModData, StatusCode, HTTPHeaders) ->
 			       ExtraHeaders ++ HTTPHeaders).
 
 handle_body(_, #mod{method = "HEAD"} = ModData, _, _, Size, _) ->
-    process_flag(trap_exit,false),
     {proceed, [{response, {already_sent, 200, Size}} | ModData#mod.data]};
 
 handle_body(Pid, ModData, Body, Timeout, Size, IsDisableChunkedSend) ->
@@ -454,34 +451,54 @@ handle_body(Pid, ModData, Body, Timeout, Size, IsDisableChunkedSend) ->
     httpd_response:send_chunk(ModData, Body, IsDisableChunkedSend),
     receive 
 	{esi_data, Data} when is_binary(Data) ->
-	    ?hdrt("handle_body - received binary data (esi)", []),
 	    handle_body(Pid, ModData, Data, Timeout, Size + byte_size(Data),
 			IsDisableChunkedSend);
 	{esi_data, Data} ->
-	    ?hdrt("handle_body - received data (esi)", []),
 	    handle_body(Pid, ModData, Data, Timeout, Size + length(Data),
 			IsDisableChunkedSend);
 	{ok, Data} ->
-	    ?hdrt("handle_body - received data (ok)", []),
 	    handle_body(Pid, ModData, Data, Timeout, Size + length(Data),
 			IsDisableChunkedSend);
 	{'EXIT', Pid, normal} when is_pid(Pid) ->
-	    ?hdrt("handle_body - exit:normal", []),
 	    httpd_response:send_final_chunk(ModData, IsDisableChunkedSend),
 	    {proceed, [{response, {already_sent, 200, Size}} | 
 		       ModData#mod.data]};
 	{'EXIT', Pid, Reason} when is_pid(Pid) ->
-	    ?hdrv("handle_body - exit", [{reason, Reason}]),
-	    httpd_response:send_final_chunk(ModData, IsDisableChunkedSend),
-	    exit({mod_esi_linked_process_died, Pid, Reason})
-
+	    Error = lists:flatten(io_lib:format("mod_esi process failed with reason ~p", [Reason])),
+	    httpd_util:error_log(ModData#mod.config_db, Error),
+	    httpd_response:send_final_chunk(ModData, 
+					    [{"Warning", "199 inets server - body maybe incomplete, "
+					      "internal server error"}],
+					    IsDisableChunkedSend),
+	    done
     after Timeout ->
-	    ?hdrv("handle_body - timeout", []),
-	    process_flag(trap_exit,false),
-	    httpd_response:send_final_chunk(ModData, IsDisableChunkedSend),
-	    exit({mod_esi_linked_process_timeout, Pid})
+	    kill_esi_delivery_process(Pid),
+	    httpd_response:send_final_chunk(ModData, [{"Warning", "199 inets server - "
+						       "body maybe incomplete, timed out"}],
+					    IsDisableChunkedSend),
+	    done
     end.
 
+kill_esi_delivery_process(Pid) -> 
+    exit(Pid, kill),
+    receive 
+	{'EXIT', Pid, killed} ->	
+	    %% Clean message queue
+	    receive
+		{esi_data, _} ->
+		    ok
+	    after 0 ->
+		    ok
+	    end,
+	    receive
+		{ok, _} ->
+		    ok
+	    after 0 ->
+		    ok
+	    end
+    end.    
+	
+
 erl_script_timeout(Db) ->
     httpd_util:lookup(Db, erl_script_timeout, ?DEFAULT_ERL_TIMEOUT).
 
diff --git a/lib/inets/test/httpd_1_1.erl b/lib/inets/test/httpd_1_1.erl
index dd9d21bbfc..db6def9d17 100644
--- a/lib/inets/test/httpd_1_1.erl
+++ b/lib/inets/test/httpd_1_1.erl
@@ -24,7 +24,7 @@
 -include_lib("kernel/include/file.hrl").
 
 -export([host/4, chunked/4, expect/4, range/4, if_test/5, trace/4,
-	 head/4, mod_cgi_chunked_encoding_test/5]).
+	 head/4, mod_cgi_chunked_encoding_test/5, mod_esi_chunk_timeout/4]).
 
 %% -define(all_keys_lower_case,true).
 -ifndef(all_keys_lower_case).
@@ -274,6 +274,15 @@ mod_cgi_chunked_encoding_test(Type, Port, Host, Node, [Request| Rest])->
 				       [{statuscode, 200}]),
     mod_cgi_chunked_encoding_test(Type, Port, Host, Node, Rest).
 
+
+mod_esi_chunk_timeout(Type, Port, Host, Node) ->
+    ok = httpd_test_lib:verify_request(Type, Host, Port, Node, 
+				       "GET /cgi-bin/erl/httpd_example/chunk_timeout?input=20000 HTTP/1.1\r\n" 
+				       "Host:"++ Host ++"\r\n"
+				       "\r\n",
+				       [{statuscode, 200},
+					{header, "warning"}]).
+     
 %%--------------------------------------------------------------------
 %% Internal functions
 %%--------------------------------------------------------------------
diff --git a/lib/inets/test/httpd_SUITE.erl b/lib/inets/test/httpd_SUITE.erl
index 9bd6f3636c..1d8a603981 100644
--- a/lib/inets/test/httpd_SUITE.erl
+++ b/lib/inets/test/httpd_SUITE.erl
@@ -117,7 +117,7 @@ groups() ->
      {htaccess, [], [htaccess_1_1, htaccess_1_0, htaccess_0_9]},
      {security, [], [security_1_1, security_1_0]}, %% Skip 0.9 as causes timing issus in test code
      {http_1_1, [], [host, chunked, expect, cgi, cgi_chunked_encoding_test,
-		     trace, range, if_modified_since] ++ http_head() ++ http_get() ++ load()},
+		     trace, range, if_modified_since, mod_esi_chunk_timeout] ++ http_head() ++ http_get() ++ load()},
      {http_1_0, [], [host, cgi, trace] ++ http_head() ++ http_get() ++ load()},
      {http_0_9, [], http_head() ++ http_get() ++ load()}
     ].
@@ -757,6 +757,13 @@ esi(Config) when is_list(Config) ->
 		     Config, [{statuscode, 200},
 		      {no_header, "cache-control"}]).
 %%-------------------------------------------------------------------------
+mod_esi_chunk_timeout(Config) when is_list(Config) -> 
+    ok = httpd_1_1:mod_esi_chunk_timeout(?config(type, Config), 
+					 ?config(port, Config),
+					 ?config(host, Config),
+					 ?config(node, Config)).
+
+%%-------------------------------------------------------------------------
 cgi() ->
     [{doc, "Test mod_cgi"}].
 
diff --git a/lib/inets/test/httpd_test_lib.erl b/lib/inets/test/httpd_test_lib.erl
index a5b836f651..c58966ce10 100644
--- a/lib/inets/test/httpd_test_lib.erl
+++ b/lib/inets/test/httpd_test_lib.erl
@@ -235,11 +235,17 @@ validate(RequestStr, #state{status_line = {Version, StatusCode, _},
 	_ ->
 	    ok
     end,
-    do_validate(http_response:header_list(Headers), Options, N, P),
-    check_body(RequestStr, StatusCode, 
-	       Headers#http_response_h.'content-type',
-	       list_to_integer(Headers#http_response_h.'content-length'),
-	       Body).
+    HList = http_response:header_list(Headers),
+    do_validate(HList, Options, N, P),
+    case lists:keysearch("warning", 1, HList) of
+	{value, _} ->
+	    ok;
+	_ ->
+	    check_body(RequestStr, StatusCode, 
+		       Headers#http_response_h.'content-type',
+		       list_to_integer(Headers#http_response_h.'content-length'),
+		       Body)
+    end.
 
 %--------------------------------------------------------------------
 %% Internal functions