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Merge pull request #1 from rbkmoney/CAPI-387/ft/kitten_cowboy

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CAPI-387: Cowboy kitten
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Toporkov Igor 2019-09-30 14:37:59 +03:00 committed by GitHub
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.eunit
deps
*.o
*.beam
*.plt
erl_crash.dump
ebin/*.beam
rel/example_project
.concrete/DEV_MODE
.rebar
_build/*

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#
# Copyright 2019 RBKmoney
# 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.
REBAR := $(shell which rebar3 2>/dev/null || which ./rebar3)
all: compile
compile:
$(REBAR) compile
rebar-update:
$(REBAR) update
test:
$(REBAR) eunit
xref:
$(REBAR) as test xref
clean:
$(REBAR) clean
distclean:
$(REBAR) clean -a
rm -rfv _build
dialyze:
$(REBAR) as test dialyzer
lint:
elvis rock

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# kitten_cowboy
# cowboy_kitten
Respond with style
## Description
This application provides `cowboy` `stream_handler` to send customized response bodies
depending on status code. For every response that cowboy is about to send, `kitten_cowboy` will
depending on status code. For every response that cowboy is about to send, `cowboy_kitten` will
check status code against rules, you set and modify response body if nessesary.
## Usage
Just add cowboy_kitten to the stream chain. It is recomended to add it just before the `cowboy_stream_h` handler. `resp_bodies` should be provided inside the `env` map, that is a part of cowboy setup.
#### Response body format
Response bodies can be one of two types: files or binary strings, if you want to send file, use `{file, Filename}` tuple, binary strings can be used directly.
### Example
```
cowboy:start_clear(http, [{port, 8080}], #{
stream_handlers => [cowboy_kitten, cowboy_stream_h],
env => #{
dispatch => Dispatch,
resp_bodies => #{
500 => {file, "500_error_resp_file"},
400 => <<"400_error_msg">>
}
}
}).
```

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|\---/|
| o_o |
\_^_/

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%%%
%%% Copyright 2019 RBKmoney
%%%
%%% 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.
%%%
[
{elvis, [
{config, [
#{
dirs => ["src", "test"],
filter => "*.erl",
rules => [
{elvis_style, line_length, #{limit => 120, skip_comments => false}},
{elvis_style, no_tabs},
{elvis_style, no_trailing_whitespace},
{elvis_style, macro_module_names},
{elvis_style, operator_spaces, #{rules => [{right, ","}, {right, "++"}, {left, "++"}]}},
{elvis_style, nesting_level, #{level => 3}},
{elvis_style, god_modules, #{limit => 25}},
{elvis_style, no_if_expression},
{elvis_style, invalid_dynamic_call},
{elvis_style, used_ignored_variable},
{elvis_style, no_behavior_info},
{elvis_style, module_naming_convention, #{regex => "^([a-z][a-z0-9]*_?)*(_SUITE)?$"}},
{elvis_style, function_naming_convention, #{regex => "^([a-z][a-z0-9]*_?)*$"}},
{elvis_style, state_record_and_type},
{elvis_style, no_spec_with_records},
{elvis_style, dont_repeat_yourself, #{min_complexity => 10}},
{elvis_style, no_debug_call, #{ignore => [elvis, elvis_utils]}}
]
},
#{
dirs => ["."],
filter => "Makefile",
ruleset => makefiles
},
#{
dirs => ["."],
filter => "elvis.config",
ruleset => elvis_config
},
#{
dirs => ["."],
filter => "rebar.config",
rules => [
{elvis_style, line_length, #{limit => 120, skip_comments => false}},
{elvis_style, no_tabs},
{elvis_style, no_trailing_whitespace}
]
},
#{
dirs => ["src"],
filter => "*.app.src",
rules => [
{elvis_style, line_length, #{limit => 120, skip_comments => false}},
{elvis_style, no_tabs},
{elvis_style, no_trailing_whitespace}
]
}
]}
]}
].

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rebar.config Normal file
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%%%
%%% Copyright 2019 RBKmoney
%%%
%%% 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.
%%%
%% Common project erlang options.
{erl_opts, [
% mandatory
debug_info,
warnings_as_errors,
warn_export_all,
warn_missing_spec,
warn_untyped_record,
warn_export_vars,
% by default
warn_unused_record,
warn_bif_clash,
warn_obsolete_guard,
warn_unused_vars,
warn_shadow_vars,
warn_unused_import,
warn_unused_function,
warn_deprecated_function
]}.
%% XRef checks
{xref_checks, [
undefined_function_calls,
undefined_functions,
deprecated_functions_calls,
deprecated_functions
]}.
{deps, [
{cowboy, "2.5.0"},
{genlib,
{git, "https://github.com/rbkmoney/genlib.git",
{branch, "master"}
}
}
]}.
%% Tests
{cover_enabled, true}.
%% Dialyzer static analyzing
{dialyzer, [
{warnings, [
% mandatory
unmatched_returns,
error_handling,
race_conditions,
unknown
]},
{plt_apps, all_deps},
{plt_extra_apps, [eunit]}
]}.

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rebar.lock Normal file
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{"1.1.0",
[{<<"cowboy">>,{pkg,<<"cowboy">>,<<"2.5.0">>},0},
{<<"cowlib">>,{pkg,<<"cowlib">>,<<"2.6.0">>},1},
{<<"genlib">>,
{git,"https://github.com/rbkmoney/genlib.git",
{ref,"901f5d7232e21cddc80c2864bf0c918e862b861a"}},
0},
{<<"ranch">>,{pkg,<<"ranch">>,<<"1.6.2">>},1}]}.
[
{pkg_hash,[
{<<"cowboy">>, <<"4EF3AE066EE10FE01EA3272EDC8F024347A0D3EB95F6FBB9AED556DACBFC1337">>},
{<<"cowlib">>, <<"8AA629F81A0FC189F261DC98A42243FA842625FEEA3C7EC56C48F4CCDB55490F">>},
{<<"ranch">>, <<"6DB93C78F411EE033DBB18BA8234C5574883ACB9A75AF0FB90A9B82EA46AFA00">>}]}
].

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%%%
%%% Copyright 2019 RBKmoney
%%%
%%% 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.
%%%
{application, cowboy_kitten, [
{description, "Respond them with style"},
{vsn, "0.1.0"},
{registered, []},
{applications, [
kernel,
stdlib,
genlib,
cowboy
]},
{env,[]},
{modules, []},
{maintainers, [
"Toporkov Igor <i.toporkov@rbkmoney.com>"
]},
{licenses, ["Apache 2.0"]}
]}.

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%%%
%%% Copyright 2019 RBKmoney
%%%
%%% 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.
%%%
-module(cowboy_kitten).
-behaviour(cowboy_stream).
%% callback exports
-export([init/3]).
-export([data/4]).
-export([info/3]).
-export([terminate/3]).
-export([early_error/5]).
-type state() :: #{
next := any(),
resp_bodies := resp_bodies()
}.
-type resp_body() :: {file, file:name_all()} | iodata().
-type resp_bodies() :: #{
cowboy:http_status() => resp_body()
}.
%% callbacks
-spec init(cowboy_stream:streamid(), cowboy_req:req(), cowboy:opts())
-> {cowboy_stream:commands(), state()}.
init(StreamID, Req, Opts) ->
{Commands0, Next} = cowboy_stream:init(StreamID, Req, Opts),
{Commands0, make_state(Next, Opts)}.
-spec data(cowboy_stream:streamid(), cowboy_stream:fin(), cowboy_req:resp_body(), State)
-> {cowboy_stream:commands(), State} when State::state().
data(StreamID, IsFin, Data, #{next := Next0} = State) ->
{Commands0, Next} = cowboy_stream:data(StreamID, IsFin, Data, Next0),
{Commands0, State#{next => Next}}.
-spec info(cowboy_stream:streamid(), any(), State)
-> {cowboy_stream:commands(), State} when State::state().
info(StreamID, {response, _, _, _} = Info, #{next := Next0} = State) ->
Resp1 = handle_response(Info, State),
{Commands0, Next} = cowboy_stream:info(StreamID, Resp1, Next0),
{Commands0, State#{next => Next}};
info(StreamID, Info, #{next := Next0} = State) ->
{Commands0, Next} = cowboy_stream:info(StreamID, Info, Next0),
{Commands0, State#{next => Next}}.
-spec terminate(cowboy_stream:streamid(), cowboy_stream:reason(), state()) -> any().
terminate(StreamID, Reason, #{next := Next}) ->
cowboy_stream:terminate(StreamID, Reason, Next).
-spec early_error(cowboy_stream:streamid(), cowboy_stream:reason(),
cowboy_stream:partial_req(), Resp, cowboy:opts()) -> Resp
when Resp::cowboy_stream:resp_command().
early_error(StreamID, Reason, PartialReq, Resp, Opts) ->
Resp1 = handle_response(Resp, Opts),
cowboy_stream:early_error(StreamID, Reason, PartialReq, Resp1, Opts).
%% private functions
handle_response({response, Code, Headers, Body} = Resp, #{resp_bodies := RespBodies}) ->
case maps:is_key(Code, RespBodies) of
true ->
respond_with_body(Code, Headers, get_resp_body(Code, RespBodies), Body);
false ->
Resp
end.
respond_with_body(Code, Headers, undefined, Body) ->
{response, Code, Headers, Body};
respond_with_body(Code, Headers0, RespBody, _) ->
Size = get_body_length(RespBody),
Headers = maps:merge(Headers0, #{
<<"content-type">> => <<"text/plain; charset=utf-8">>,
<<"content-length">> => integer_to_list(Size)
}),
Body = case RespBody of
{file, File} ->
{sendfile, 0, Size, File};
Binary ->
Binary
end,
{response, Code, Headers, Body}.
get_body_length({file, File}) ->
filelib:file_size(File);
get_body_length(Binary) ->
string:length(Binary).
get_resp_body(Code, RespBodies) ->
do_get_resp_body(Code, genlib_map:get(Code, RespBodies)).
do_get_resp_body(Code, {file, Filename} = File) ->
case file_exists(Filename) of
true ->
File;
false ->
_ = logger:warning(
"Invalid resp body config for code: ~p, file ~p doesn't exist .",
[Code, Filename]
),
undefined
end;
do_get_resp_body(_, Binary) when is_binary(Binary) ->
Binary;
do_get_resp_body(Code, _) ->
_ = logger:warning("Invalid resp body config for code: ~p, wrong type.", [Code]),
undefined.
file_exists(Filename) ->
filelib:is_regular(Filename). % we can count irregular files as non-existent
make_state(Next, Opts) ->
#{
next => Next,
resp_bodies => get_resp_bodies(Opts)
}.
get_resp_bodies(#{env := Env}) ->
genlib_map:get(resp_bodies, Env, #{}).
-ifdef(TEST).
-include_lib("eunit/include/eunit.hrl").
-define(KITTEN, "data/ascii_cat").
-spec test() -> _.
-spec success_kitten_file_test() -> _.
success_kitten_file_test() ->
{ok, CWD} = file:get_cwd(),
KittenFile = filename:join(CWD, ?KITTEN),
R = handle_response({response, 500, #{}, <<"OLD BODY">>}, #{resp_bodies => #{500 => {file, KittenFile}}}),
{_, _, _, {sendfile, _, _, KittenFile}} = R.
-spec success_kitten_binary_test() -> _.
success_kitten_binary_test() ->
{ok, Kitten} = file:read_file(?KITTEN),
{_, _, _, Kitten} = handle_response({response, 500, #{}, <<"OLD BODY">>}, #{resp_bodies => #{500 => Kitten}}).
-spec no_replacement_test() -> _.
no_replacement_test() ->
Body = <<"Can't replace me">>,
{_, _, _, Body} = handle_response({response, 500, #{}, Body}, #{resp_bodies => #{503 => <<"Unrelated">>}}).
-endif.

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wercker.yml Normal file
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box: erlang:21
dev:
steps:
- internal/shell:
code: make compile
build:
steps:
- script:
name: compile
code: make compile
- script:
name: dialyze
code: env REBAR_CACHE_DIR="${WERCKER_CACHE_DIR}" rebar3 dialyzer
- script:
name: run xref
code: make xref
- script:
name: run test suite
code: make test