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%%
%% Copyright (C) 2014, Feuerlabs
%%
%% This program is licensed under the terms and conditions of the
%% Mozilla Public License, version 2.0. The full text of the
%% Mozilla Public License is at https://www.mozilla.org/MPL/2.0/
%%
-module(exoport_exo_http).
-export([instance/3,
handle_body/4]).
-include_lib("exo/include/exo_http.hrl").
-include_lib("lager/include/log.hrl").
instance(SupMod, AppMod, Opts) ->
?debug("exoport_exo_http:instance(): SupModule(~p), Opts(~p)",
[ SupMod, Opts]),
Port = opt(port, Opts, 8800),
Child = {exo_http, {exo_http_server, start_link,
[Port, [{request_handler,
{?MODULE, handle_body, [AppMod]}}]]},
permanent, 5000, worker, [exo_http_server]},
case supervisor:start_child(SupMod, Child) of
{ok, _} -> ok;
{ok, _, _} -> ok;
Err -> Err
end.
handle_body(Socket, Request, Body, AppMod) when Request#http_request.method == 'POST' ->
ensure_ready(fun handle_post/4, Socket, Request, Body, AppMod);
handle_body(Socket, _Request, _Body, _AppMod) ->
exo_http_server:response(Socket, undefined, 404, "Not Found",
"Object not found. Try using POST method.").
handle_post(Socket, Request, Body, AppMod) ->
case Request#http_request.headers of
#http_chdr{content_type = "application/json" ++ _ = T}
when T=="application/json";
T=="application/json-rpc";
T=="application/jsonrequest" ->
handle_post_json(Socket, Request, Body, AppMod);
#http_chdr{content_type = "multipart/" ++ _} ->
handle_post_multipart(Socket, Request, Body, AppMod)
end.
handle_post_json(Socket, _Request, Body, AppMod) ->
try decode_json(Body) of
{call, Id, Method, Args} ->
try handle_rpc(AppMod, Method, Args) of
{ok, Reply} ->
success_response(Socket, Id, Reply);
ok ->
ok;
{error, Error} ->
error_response(Socket, Id, Error)
catch
error:Reason ->
?debug("~p:handle_rpc(~p, ~p, ~p) ERROR: ~p~n~p",
[?MODULE, AppMod, Method, Args, Reason,
erlang:get_stacktrace()]),
error_response(Socket, Id, internal_error)
end;
{notification, Method, Args} ->
handle_notification(AppMod, Method, Args),
exo_http_server:response(Socket, undefined, 200, "OK", "");
{error, _} ->
error_response(Socket, parse_error)
catch
error:_ ->
exo_http_server:response(Socket, undefined, 501,
"Internal Error",
"Internal Error")
end.
handle_post_multipart(Socket, Request, Body, _AppMod) ->
case (Request#http_request.headers)#http_chdr.content_type of
"multipart/" ++ _ = Type ->
{match, [B]} =
re:run(Type, "boundary\\s*=\\s*(.+)$", [{capture,[1],binary}]),
BoundaryRe = <<"--",B/binary,"\\s*\\r\\n|",
"\\r\\n--",B/binary,"\\s*\\r\\n|",
"\\r\\n--",B/binary,"--\\s*\\r\\n">>,
Parts = [decode_part(P)
|| P <- re:split(Body, BoundaryRe, [{return,binary}]),
P =/= <<>>],
io:fwrite("Parts = ~p~n", [Parts]),
error_response(Socket, internal_error)
end.
decode_part(P) ->
decode_part(P, []).
decode_part(P, Acc) ->
case erlang:decode_packet(httph, P, []) of
{ok, {http_header,_,K,_,V}, Rest} ->
decode_part(Rest, [exo_http:set_chdr(K,V,#http_chdr{})|Acc]);
{ok, http_eoh, Body} ->
{lists:reverse(Acc), Body};
{ok, {http_error, _}, _} ->
{lists:reverse(Acc), P}
end.
%% Validated RPC
handle_rpc(Mod, Method, Args) ->
?debug("exoport_exo_http_server:handle_rpc(): Mod: ~p", [Mod]),
?debug("exoport_exo_http_server:handle_rpc(): Method: ~p", [Method]),
?debug("exoport_exo_http_server:handle_rpc(): Args: ~p", [Args]),
try Mod:handle_rpc(Method, Args) of
{ok, Result} ->
?debug("exoport_exo_http_server:handle_rpc(ok): Result: ~p", [Result]),
{ok, Result};
{error, Reason} ->
{error, Reason};
Wut ->
?warning("exoport_exo_http_server:handle_rpc(ok): UNKNOWN: ~p", [Wut]),
{error, Wut}
catch
error:Crash ->
?error("rpc_callback() CRASHED: Reason: ~p", [Crash]),
?error("post_request() CRASHED: Stack: ~p", [erlang:get_stacktrace()]),
{error, {internal_error, Crash}}
end.
handle_notification(Mod, Method, Args) ->
?debug("exoport_exo_http_server:handle_notification(): Mod: ~p", [Mod]),
?debug("exoport_exo_http_server:handle_notification(): Method: ~p", [Method]),
?debug("exoport_exo_http_server:handle_notification(): Args: ~p", [Args]),
try Mod:handle_notification(Method, Args) of
_ -> ok
catch
error:Crash ->
?error("rpc_callback() CRASHED: Reason: ~p", [Crash]),
?error("post_request() CRASHED: Stack: ~p", [erlang:get_stacktrace()]),
{error, {internal_error, Crash}}
end.
success_response(Socket, Id, Reply) ->
JSON = [{<<"jsonrpc">>, <<"2.0">>},
{<<"id">>, Id},
{<<"result">>, Reply}],
exo_http_server:response(Socket, undefined, 200, "OK",
jsx:encode(JSON),
[{content_type, "application/json"}]).
error_response(Socket, Error) ->
%% No Id available
JSON = [{<<"jsonrpc">>, <<"2.0">>},
{<<"error">>, [{<<"code">>, json_error_code(Error)},
{<<"message">>, json_error_msg(Error)}]}],
Body = jsx:encode(JSON),
exo_http_server:response(Socket, undefined, 200, "OK", Body,
[{content_type, "application/json"}]).
error_response(Socket, Id, Error) ->
JSON = [{<<"jsonrpc">>, <<"2.0">>},
{<<"id">>, Id},
{<<"error">>, [{<<"code">>, json_error_code(Error)},
{<<"message">>, json_error_msg(Error)}]}],
Body = jsx:encode(JSON),
exo_http_server:response(Socket, undefined, 200, "OK", Body,
[{content_type, "application/json"}]).
decode_json(Body) ->
try jsx:decode(Body) of
[T|_] = Elems when is_tuple(T) ->
case [opt(K,Elems,undefined) ||
K <- [<<"jsonrpc">>, <<"id">>,
<<"method">>, <<"params">>]] of
[<<"2.0">>,undefined,Method,Params]
when Method =/= undefined,
Params =/= undefined ->
{notification, Method, Params};
[<<"2.0">>,Id,Method,Params]
when Id=/=undefined,
Method=/=undefined,
Params =/= undefined ->
{call, Id, Method, Params};
_ ->
{error, invalid}
end
catch
error:_ ->
{error, parse_error}
end.
json_error_code(parse_error ) -> -32700;
json_error_code(invalid_request ) -> -32600;
json_error_code(method_not_found) -> -32601;
json_error_code(invalid_params ) -> -32602;
json_error_code(internal_error ) -> -32603;
json_error_code(_) -> -32603. % internal error
json_error_msg(-32700) -> <<"parse error">>;
json_error_msg(-32600) -> <<"invalid request">>;
json_error_msg(-32601) -> <<"method not found">>;
json_error_msg(-32602) -> <<"invalid params">>;
json_error_msg(-32603) -> <<"internal error">>;
json_error_msg(Code) when Code >= -32099, Code =< -32000 -> <<"server error">>;
json_error_msg(_) -> <<"json error">>.
opt(K, L, Def) ->
case lists:keyfind(K, 1, L) of
{_, V} -> V;
false -> Def
end.
ensure_ready(F, Socket, Request, Body, AppMod) ->
try rvi_server:ensure_ready(_Timeout = 10000),
F(Socket, Request, Body, AppMod)
catch
error:timeout ->
?error("~p timeout waiting for rvi_core", [?MODULE]),
exo_http_server:response(Socket, undefined, 501,
"Internal Error",
"Internal Error")
end.
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