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may consider it more useful to permit linking proprietary applications with
the library. If this is what you want to do, use the GNU Lesser General
Public License instead of this License. But first, please read
<https://www.gnu.org/licenses/why-not-lgpl.html>.
README.md
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gm_ctflow
=====
A helper application for cross-testcase test flows in Common Test
Description
----
When testing complex systems it often feels convenient to organize test
sequences as a sequential group where a series of test cases perform a
flow of operations. A challenge may arise when the results from one
test case need to be reused by later cases - Common Test does cater for
this through the `save_config` return.
However, occasionally, one also needs to have bespoke servers running
for the duration of such a sequence, and this tends to lead to hacking
a plain process with a custom protocol.
This application attempts to make that a bit more structured.
In its initial version, there are two APIs:
* `gm_ctflow_fun`, where one can instantiate a stateful handler fun,
which can be called by test cases as needed.
* `gm_ctflow_worker`, a gen_server where the server logic is given
by a user-provided fun. The server is spawned under a
`simple_one_for_one` supervisor.
The application `gm_ctflow` is intended to be started in
`init_per_suite/1` and stopped in `end_per_suite/1`, or in
`init_per_group/2` / `end_per_group/2`.
Some examples from `test/gm_ctflow_SUITE.erl`:
```erlang
groups() ->
[ {statefuns, [sequence], [ init_counter
, incr
, check1 %% state = 1
, incr
, check2 %% state = 2
, incr
, check3 %% state = 3
]}
, {workers, [sequence], [ init_counter
, init_worker
, append
, checkl1 %% [A0]
, append
, checkl2 %% [A0, A1]
, append
, checkl3 %% [A0, A1, A2]
]}
].
```
Here, we interleave test cases with checks of the flow fun states.
This test suite does nothing but exercize the flow funs, but normally,
these funs would be used to e.g. spawn an endpoint needed for the tests,
or thread some state through a test sequence.
The `gm_ctflow` application is started and stopped per-group here:
```erlang
init_per_group(_Grp, Config) ->
ok = application:start(gm_ctflow, permanent),
Config.
end_per_group(_Grp, _Config) ->
ok = application:stop(gm_ctflow),
ok.
```
This resets the state and removes all helper processes for each group.
Build
-----
$ rebar3 compile
Test
-----
$ rebar ct
rebar.config
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{erl_opts, [debug_info]}.
{deps, []}.
{shell, [
%% {config, "config/sys.config"},
{apps, [gm_ctflow]}
]}.
rebar.lock
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[].
src/gm_ctflow.app.src
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{application, gm_ctflow, [
{description, "Common Test helper for tasks spanning multiple testcases"},
{vsn, "0.1.0"},
{registered, []},
{mod, {gm_ctflow_app, []}},
{applications, [
kernel,
stdlib
]},
{env, []},
{modules, []},
{licenses, ["GPL-3.0"]},
{links, []}
]}.
src/gm_ctflow.erl
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-module(gm_ctflow).
-type flow() :: any().
-export_type([ flow/0 ]).
src/gm_ctflow_app.erl
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%%%-------------------------------------------------------------------
%% @doc gm_ctflow public API
%% @end
%%%-------------------------------------------------------------------
-module(gm_ctflow_app).
-behaviour(application).
-export([start/2, stop/1]).
start(_StartType, _StartArgs) ->
gm_ctflow_sup:start_link().
stop(_State) ->
ok.
%% internal functions
src/gm_ctflow_fun.erl
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-module(gm_ctflow_fun).
-type flow() :: gm_ctflow:flow().
-type request() :: any().
-type result() :: any().
-type state() :: any().
-export([ new/3 %% (Flow, Fun, InitState)
, call/2 %% (Flow, Req)
, call/3 %% (Flow, Req, Timeout)
, get_state/1 %% (Flow)
, get_state/2 %% (Flow, Timeout)
]).
-spec new(Flow, F, St) -> ok
when Flow :: gm_ctflow:flow(),
F :: fun((Req, St) -> {ok, Res, St}),
Req :: request(),
St :: state(),
Res :: result().
new(Flow, F, St) ->
gm_ctflow_server:new(Flow, F, St).
-spec call(flow(), request()) -> result() | no_return().
call(Flow, Req) ->
gm_ctflow_server:call(Flow, Req).
-spec call(flow(), request(), timeout()) -> result() | no_return().
call(Flow, Req, Timeout) ->
gm_ctflow_server:call(Flow, Req, Timeout).
-spec get_state(flow()) -> state() | no_return().
get_state(Flow) ->
gm_ctflow_server:get_state(Flow).
-spec get_state(flow(), timeout()) -> state() | no_return().
get_state(Flow, Timeout) ->
gm_ctflow_server:get_state(Flow, Timeout).
src/gm_ctflow_server.erl
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-module(gm_ctflow_server).
-behavior(gen_server).
-export([ start_link/0
, init/1
, handle_call/3
, handle_cast/2
, handle_info/2
, terminate/2
, code_change/3 ]).
-type flow() :: gm_ctflow:flow().
-type request() :: any().
-type result() :: any().
-type state() :: any().
-export([ new/3 %% (Flow, Fun, InitState)
, call/2 %% (Flow, Req)
, call/3 %% (Flow, Req, Timeout)
, get_state/1 %% (Flow)
, get_state/2 %% (Flow, Timeout)
]).
-spec new(Flow, F, St) -> ok
when Flow :: gm_ctflow:flow(),
F :: fun( (Req, St) -> {ok, Res, St} ),
Req :: request(),
St :: state(),
Res :: result().
new(Flow, F, St) when is_function(F, 2) ->
call_({new, Flow, F, St}).
-spec call(flow(), request()) -> result() | no_return().
call(Flow, Req) ->
call_({call, Flow, Req}).
-spec call(flow(), request(), timeout()) -> result() | no_return().
call(Flow, Req, Timeout) ->
call_({call, Flow, Req}, Timeout).
-spec get_state(flow()) -> state() | no_return().
get_state(Flow) ->
call_({get_state, Flow}, infinity).
-spec get_state(flow(), timeout()) -> state() | no_return().
get_state(Flow, Timeout) ->
call_({get_state, Flow}, Timeout).
call_(Req) ->
call_(Req, infinity).
call_(Req, Timeout) ->
try gen_server:call(?MODULE, Req, Timeout) of
{error, E} ->
error(E);
{ok, Res} ->
Res
catch
exit:timeout ->
error(timeout)
end.
start_link() ->
gen_server:start_link({local, ?MODULE}, ?MODULE, [], []).
init([]) ->
{ok, #{}}.
handle_call({new, Flow, F, InitSt}, _From, St) ->
case maps:is_key(Flow, St) of
true ->
{reply, {error, exists}, St};
false ->
St1 = St#{Flow => {F, InitSt}},
{reply, {ok, ok}, St1}
end;
handle_call({call, Flow, Req}, _From, St) ->
case maps:find(Flow, St) of
{ok, {F, FSt}} when is_function(F, 2) ->
try F(Req, FSt) of
{ok, Res, FSt1} ->
{reply, {ok, Res}, St#{Flow := {F, FSt1}}};
Other ->
Error = {error, {bad_return, Other}},
{reply, Error, St#{Flow := Error}}
catch
error:E:ST ->
Error = {error, {E, ST}},
{reply, Error, St#{Flow := Error}}
end;
error ->
{reply, {error, unknown_flow}, St}
end;
handle_call({get_state, Flow}, _From, St) ->
case maps:find(Flow, St) of
{ok, {F, FSt}} when is_function(F, 2) ->
{reply, {ok, FSt}, St};
error ->
{reply, {error, unknown_flow}, St}
end.
handle_cast(_Mst, St) ->
{noreply, St}.
handle_info(_Msg, St) ->
{noreply, St}.
terminate(_Reason, _St) ->
ok.
code_change(_FromVsn, St, _Extra) ->
{ok, St}.
src/gm_ctflow_sup.erl
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%%%-------------------------------------------------------------------
%% @doc gm_ctflow top level supervisor.
%% @end
%%%-------------------------------------------------------------------
-module(gm_ctflow_sup).
-behaviour(supervisor).
-export([start_link/0]).
-export([child/2]).
-export([init/1]).
-define(SERVER, ?MODULE).
start_link() ->
supervisor:start_link({local, ?SERVER}, ?MODULE, []).
%% sup_flags() = #{strategy => strategy(), % optional
%% intensity => non_neg_integer(), % optional
%% period => pos_integer()} % optional
%% child_spec() = #{id => child_id(), % mandatory
%% start => mfargs(), % mandatory
%% restart => restart(), % optional
%% shutdown => shutdown(), % optional
%% type => worker(), % optional
%% modules => modules()} % optional
init([]) ->
SupFlags = #{
strategy => one_for_all,
intensity => 0,
period => 1
},
ChildSpecs = [
child(gm_ctflow_server, worker)
, child(gm_ctflow_worker_sup, supervisor)
],
{ok, {SupFlags, ChildSpecs}}.
%% internal functions
child(Mod, Type) ->
#{ id => Mod
, start => {Mod, start_link, []}
, restart => permanent
, shutdown => 5000
, type => Type
, modules => child_mods(Type, Mod)
}.
child_mods(worker, Mod) ->
[Mod];
child_mods(supervisor, _) ->
dynamic.
src/gm_ctflow_worker.erl
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-module(gm_ctflow_worker).
-behavior(gen_server).
-export([ start/2
, call/2
, call/3
, cast/2
, get_state/1
, get_state/2
, stop/1 ]).
-export([ start_link/2
, init/1
, handle_call/3
, handle_cast/2
, handle_info/2
, terminate/2
, code_change/3
]).
-export([ init_reg/0
, register_name/2
, unregister_name/1
, whereis_name/1
, send/2 ]).
-type flow() :: gm_ctflow:flow().
-type state() :: any().
-type from() :: gen_server:from().
-type op() :: 'cast' | 'info' | {'call', from()}.
-type msg() :: any().
-type reply() :: any().
-type handler_reply() :: {'ok', state()}
| {'reply', reply(), state()}
| {'noreply', state()}.
-type handler_fun() :: fun( (op(), msg(), state()) -> handler_reply() ).
-type init_fun() :: fun( () -> {ok, handler_fun(), state()} ).
-spec start(flow(), init_fun()) -> {'ok', pid()}.
start(Flow, InitF) when is_function(InitF, 0) ->
supervisor:start_child(gm_ctflow_worker_sup, [Flow, InitF]).
-spec stop(flow()) -> 'ok'.
stop(Flow) ->
supervisor:terminate_child(gm_ctflow_worker_sup, whereis_name(Flow)).
-spec call(Flow, Req) -> Reply | no_return()
when Flow :: flow(),
Req :: msg(),
Reply :: reply().
call(Flow, Req) ->
call_(Flow, {call, Req}, infinity).
-spec call(Flow, Req, Timeout) -> Reply | no_return()
when Flow :: flow(),
Req :: msg(),
Timeout :: timeout(),
Reply :: reply().
call(Flow, Req, Timeout) ->
call_(Flow, Req, Timeout).
-spec cast(flow(), msg()) -> 'ok' | no_return().
cast(Flow, Msg) ->
gen_server:cast({via, ?MODULE, Flow}, Msg).
-spec get_state(flow()) -> state() | no_return().
get_state(Flow) ->
call_(Flow, get_state, infinity).
-spec get_state(flow(), timeout()) -> state() | no_return().
get_state(Flow, Timeout) ->
call_(Flow, get_state, Timeout).
call_(Flow, Req, Timeout) ->
try gen_server:call({via, ?MODULE, Flow}, Req, Timeout) of
{error, Reason} ->
error(Reason);
Other ->
Other
catch
exit:timeout ->
error(timeout)
end.
start_link(Flow, InitF) when is_function(InitF, 0) ->
gen_server:start_link({via, ?MODULE, Flow}, ?MODULE, InitF, []).
init(InitF) ->
case InitF() of
{ok, HandlerFun, St} when is_function(HandlerFun, 3) ->
{ok, {HandlerFun, St}};
Other ->
{error, Other}
end.
handle_call(get_state, _From, {_, FSt} = St) ->
{reply, FSt, St};
handle_call({call, Req}, From, {F, FSt} = St) ->
case F({call, From}, Req, FSt) of
{reply, Res, FSt1} ->
{reply, Res, {F, FSt1}};
{noreply, FSt1} ->
{noreply, {F, FSt1}};
Other ->
{stop, {error, Other}, St}
end.
handle_cast(Msg, {F, FSt} = St) ->
case F(cast, Msg, FSt) of
{ok, FSt1} ->
{noreply, {F, FSt1}};
Other ->
{stop, {error, Other}, St}
end.
handle_info(Msg, {F, FSt} = St) ->
case F(info, Msg, FSt) of
{ok, FSt1} ->
{noreply, {F, FSt1}};
Other ->
{stop, {error, Other}, St}
end.
terminate(_, _) ->
ok.
code_change(_FromVsn, S, _Extra) ->
{ok, S}.
init_reg() ->
ets:new(?MODULE, [public, named_table]).
register_name(Name, Pid) ->
case ets:insert_new(?MODULE, {Name, Pid}) of
true ->
yes;
false ->
no
end.
unregister_name(Name) ->
ets:delete(?MODULE, Name).
whereis_name(Name) ->
case ets:lookup(?MODULE, Name) of
[{_, Pid}] ->
Pid;
[] ->
undefined
end.
send(Name, Msg) ->
case whereis_name(Name) of
undefined ->
exit({badarg, {Name, Msg}});
Pid ->
Pid ! Msg,
Pid
end.
src/gm_ctflow_worker_sup.erl
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%%%-------------------------------------------------------------------
%% @doc gm_ctflow top level supervisor.
%% @end
%%%-------------------------------------------------------------------
-module(gm_ctflow_worker_sup).
-behaviour(supervisor).
-export([start_link/0]).
-export([child/2]).
-export([init/1]).
-define(SERVER, ?MODULE).
start_link() ->
supervisor:start_link({local, ?SERVER}, ?MODULE, []).
%% sup_flags() = #{strategy => strategy(), % optional
%% intensity => non_neg_integer(), % optional
%% period => pos_integer()} % optional
%% child_spec() = #{id => child_id(), % mandatory
%% start => mfargs(), % mandatory
%% restart => restart(), % optional
%% shutdown => shutdown(), % optional
%% type => worker(), % optional
%% modules => modules()} % optional
init([]) ->
gm_ctflow_worker:init_reg(),
SupFlags = #{
strategy => simple_one_for_one,
intensity => 0,
period => 1
},
ChildSpecs = [
child(gm_ctflow_worker, worker)
],
{ok, {SupFlags, ChildSpecs}}.
%% internal functions
child(Mod, Type) ->
#{ id => Mod
, start => {Mod, start_link, []}
, restart => permanent
, shutdown => 5000
, type => Type
, modules => [Mod]
}.
test/gm_ctflow_SUITE.erl
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-module(gm_ctflow_SUITE).
-export([ all/0
, groups/0
, init_per_suite/1
, end_per_suite/1
, init_per_group/2
, end_per_group/2
, init_per_testcase/2
, end_per_testcase/2
]).
%% test cases
-export([ init_counter/1
, incr/1
, check1/1
, check2/1
, check3/1
, init_worker/1
, append/1
, checkl1/1
, checkl2/1
, checkl3/1
]).
-include_lib("stdlib/include/assert.hrl").
all() ->
[
{group, statefuns}
, {group, workers}
].
groups() ->
[ {statefuns, [sequence], [ init_counter
, incr
, check1 %% state = 1
, incr
, check2 %% state = 2
, incr
, check3 %% state = 3
]}
, {workers, [sequence], [ init_counter
, init_worker
, append
, checkl1 %% [A0]
, append
, checkl2 %% [A0, A1]
, append
, checkl3 %% [A0, A1, A2]
]}
].
init_per_suite(Config) ->
Config.
end_per_suite(_Config) ->
ok.
init_per_group(_Grp, Config) ->
ok = application:start(gm_ctflow, permanent),
Config.
end_per_group(_Grp, _Config) ->
ok = application:stop(gm_ctflow),
ok.
init_per_testcase(_Case, Config) ->
Config.
end_per_testcase(_Case, _Config) ->
ok.
%% ======================================================================
%% This is our 'ctflow_fun' instance, which floats above some simple
%% test cases. In this test suite, we only exercise the flow funs, but
%% in a normal test suite, we would use them for information that isn't
%% easily threaded through the sequence of cases otherwise.
%%
init_counter(_Cfg) ->
gm_ctflow_fun:new(my_counter, fun ctr/2, 0),
ok.
incr(_Cfg) ->
Res = gm_ctflow_fun:call(my_counter, incr),
?assert(is_integer(Res)),
ok.
check1(_Cfg) -> check_(1).
check2(_Cfg) -> check_(2).
check3(_Cfg) -> check_(3).
check_(N) ->
?assertEqual(N, gm_ctflow_fun:get_state(my_counter)),
ok.
%% This is the actual fun
ctr(incr, N) ->
NewN = N+1,
{ok, NewN, NewN}.
%% ======================================================================
%% Here, we make use of the `gm_ctflow_worker` it's a complete process
%% (a gen_server, whose logic we instrument with the fun we provice).
%% For a bit of variety, we re-use the `ctr` fun, and at the same time,
%% ensure that stopping and restarting the `gm_ctflow` app clears the state.
%% (See `init_per_group/2` and `end_per_group/2`).
%%
%% Note that the worker is initiated using a fun/0, which in its turn is
%% expected to provide the fun/3 for the gen_server callback logic.
%% This is so that we can actually perform some actions at init time.
%%
init_worker(_Cfg) ->
{ok, Pid} = gm_ctflow_worker:start(my_list, fun() -> {ok, fun lfun/3, []} end),
true = is_pid(Pid),
ok.
append(_Cfg) ->
C = gm_ctflow_fun:call(my_counter, incr),
Res = gm_ctflow_worker:call(my_list, {append, {a, C}}),
?assert(is_list(Res)),
ok.
checkl1(_Cfg) -> checkl_([{a,1}]).
checkl2(_Cfg) -> checkl_([{a,1},{a,2}]).
checkl3(_Cfg) -> checkl_([{a,1},{a,2},{a,3}]).
checkl_(L) ->
?assertEqual(L, gm_ctflow_worker:get_state(my_list)),
ok.
lfun({call,_From}, {append, Item}, L) ->
NewL = L ++ [Item],
{reply, NewL, NewL}.