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webmachine_mochiweb.erl
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173 lines (153 loc) · 6.53 KB
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%% @author Justin Sheehy <[email protected]>
%% @author Andy Gross <[email protected]>
%% @copyright 2007-2008 Basho Technologies
%%
%% Licensed under the Apache License, Version 2.0 (the "License");
%% you may not use this file except in compliance with the License.
%% You may obtain a copy of the License at
%%
%% http://www.apache.org/licenses/LICENSE-2.0
%%
%% Unless required by applicable law or agreed to in writing, software
%% distributed under the License is distributed on an "AS IS" BASIS,
%% WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
%% See the License for the specific language governing permissions and
%% limitations under the License.
%% @doc Mochiweb interface for webmachine.
-module(webmachine_mochiweb).
-author('Justin Sheehy <[email protected]>').
-author('Andy Gross <[email protected]>').
-export([start/1, stop/0, stop/1, loop/2]).
%% The `log_dir' option is deprecated, but remove it from the
%% options list if it is present
-define(WM_OPTIONS, [error_handler,
log_dir,
rewrite_module,
resource_module_option]).
-define (WM_OPTION_DEFAULTS, [{error_handler, webmachine_error_handler}]).
start(Options) ->
{DispatchList, PName, DGroup, WMOptions, OtherOptions} = get_wm_options(Options),
webmachine_router:init_routes(DGroup, DispatchList),
[application_set_unless_env_or_undef(K, V) || {K, V} <- WMOptions],
MochiName = list_to_atom(to_list(PName) ++ "_mochiweb"),
LoopFun = fun(X) -> loop(DGroup, X) end,
mochiweb_http:start([{name, MochiName}, {loop, LoopFun} | OtherOptions]).
stop() ->
{registered_name, PName} = process_info(self(), registered_name),
MochiName = list_to_atom(atom_to_list(PName) ++ "_mochiweb"),
stop(MochiName).
stop(Name) ->
mochiweb_http:stop(Name).
loop(Name, MochiReq) ->
Req = webmachine:new_request(mochiweb, MochiReq),
DispatchList = webmachine_router:get_routes(Name),
Host = case host_headers(Req) of
[H|_] -> H;
[] -> []
end,
{Path, _} = Req:path(),
{RD, _} = Req:get_reqdata(),
%% Run the dispatch code, catch any errors...
try webmachine_dispatcher:dispatch(Host, Path, DispatchList, RD) of
{error, invalid_host} ->
handle_error(400, "Invalid Host", Req);
{no_dispatch_match, _UnmatchedHost, _UnmatchedPathTokens} ->
handle_error(404, {none, none, []}, Req);
{Mod, ModOpts, HostTokens, Port, PathTokens, Bindings,
AppRoot, StringPath} ->
BootstrapResource = webmachine_resource:new(x,x,x,x),
{ok,RS1} = Req:load_dispatch_data(Bindings,HostTokens,Port,
PathTokens,AppRoot,StringPath),
XReq1 = {webmachine_request,RS1},
try
{ok, Resource} = BootstrapResource:wrap(Mod, ModOpts),
{ok,RS2} = XReq1:set_metadata('resource_module',
resource_module(Mod, ModOpts)),
webmachine_decision_core:handle_request(Resource, RS2)
catch
error:Error ->
handle_error(500, {error, Error}, Req)
end
catch
Type : Error ->
handle_error(500, {Type, Error}, Req)
end.
handle_error(Code, Error, Req) ->
{ok, ErrorHandler} = application:get_env(webmachine, error_handler),
{ErrorHTML,ReqState1} =
ErrorHandler:render_error(Code, Req, Error),
Req1 = {webmachine_request,ReqState1},
{ok,ReqState2} = Req1:append_to_response_body(ErrorHTML),
Req2 = {webmachine_request,ReqState2},
{ok,ReqState3} = Req2:send_response(Code),
Req3 = {webmachine_request,ReqState3},
{LogData,_ReqState4} = Req3:log_data(),
spawn(webmachine_log, log_access, [LogData]).
get_wm_option(OptName, {WMOptions, OtherOptions}) ->
{Value, UpdOtherOptions} =
handle_get_option_result(get_option(OptName, OtherOptions), OptName),
{[{OptName, Value} | WMOptions], UpdOtherOptions}.
handle_get_option_result({undefined, Options}, Name) ->
{proplists:get_value(Name, ?WM_OPTION_DEFAULTS), Options};
handle_get_option_result(GetOptRes, _) ->
GetOptRes.
get_wm_options(Options) ->
{DispatchList, Options1} = get_option(dispatch, Options),
{Name, Options2} =
case get_option(name, Options1) of
{undefined, Opts2} ->
{webmachine, Opts2};
NRes -> NRes
end,
{DGroup, Options3} =
case get_option(dispatch_group, Options2) of
{undefined, Opts3} ->
{default, Opts3};
RRes -> RRes
end,
{WMOptions, RestOptions} = lists:foldl(fun get_wm_option/2, {[], Options3}, ?WM_OPTIONS),
{DispatchList, Name, DGroup, WMOptions, RestOptions}.
get_option(Option, Options) ->
case lists:keytake(Option, 1, Options) of
false -> {undefined, Options};
{value, {Option, Value}, NewOptions} -> {Value, NewOptions}
end.
application_set_unless_env_or_undef(_Var, undefined) ->
ok;
application_set_unless_env_or_undef(Var, Value) ->
application_set_unless_env(webmachine, Var, Value).
application_set_unless_env(App, Var, Value) ->
Current = application:get_all_env(App),
CurrentKeys = proplists:get_keys(Current),
case lists:member(Var, CurrentKeys) of
true ->
ok;
false ->
application:set_env(App, Var, Value)
end.
host_headers(Req) ->
[ V || {V,_ReqState} <- [Req:get_header_value(H)
|| H <- ["x-forwarded-host",
"x-forwarded-server",
"host"]],
V /= undefined].
get_app_env(Key) ->
application:get_env(webmachine, Key).
%% @private
%% @doc This function is used for cases where it may be desirable to
%% override the value that is set in the request metadata under the
%% `resource_module' key. An example would be a pattern where a set of
%% resource modules shares a lot of common functionality that is
%% contained in a single module and is used as the resource in all
%% dispatch rules and the `ModOpts' are used to specify a smaller
%% set of callbacks for resource specialization.
resource_module(Mod, ModOpts) ->
resource_module(Mod, ModOpts, get_app_env(resource_module_option)).
resource_module(Mod, _, undefined) ->
Mod;
resource_module(Mod, ModOpts, {ok, OptionVal}) ->
proplists:get_value(OptionVal, ModOpts, Mod).
to_list(L) when is_list(L) ->
L;
to_list(A) when is_atom(A) ->
atom_to_list(A).