From 62161193c508529b110d7a21e7e1399763b6989a Mon Sep 17 00:00:00 2001 From: Ulf Wiger Date: Sun, 24 May 2026 12:41:26 +0200 Subject: [PATCH] Initial commit --- .gitignore | 20 ++ LICENSE | 674 +++++++++++++++++++++++++++++++++++ README.md | 82 +++++ rebar.config | 7 + rebar.lock | 1 + src/gm_ctflow.app.src | 14 + src/gm_ctflow.erl | 5 + src/gm_ctflow_app.erl | 18 + src/gm_ctflow_fun.erl | 38 ++ src/gm_ctflow_server.erl | 113 ++++++ src/gm_ctflow_sup.erl | 55 +++ src/gm_ctflow_worker.erl | 161 +++++++++ src/gm_ctflow_worker_sup.erl | 50 +++ test/gm_ctflow_SUITE.erl | 134 +++++++ 14 files changed, 1372 insertions(+) create mode 100644 .gitignore create mode 100644 LICENSE create mode 100644 README.md create mode 100644 rebar.config create mode 100644 rebar.lock create mode 100644 src/gm_ctflow.app.src create mode 100644 src/gm_ctflow.erl create mode 100644 src/gm_ctflow_app.erl create mode 100644 src/gm_ctflow_fun.erl create mode 100644 src/gm_ctflow_server.erl create mode 100644 src/gm_ctflow_sup.erl create mode 100644 src/gm_ctflow_worker.erl create mode 100644 src/gm_ctflow_worker_sup.erl create mode 100644 test/gm_ctflow_SUITE.erl diff --git a/.gitignore b/.gitignore new file mode 100644 index 0000000..df53f7d --- /dev/null +++ b/.gitignore @@ -0,0 +1,20 @@ +.rebar3 +_build +_checkouts +_vendor +.eunit +*.o +*.beam +*.plt +*.swp +*.swo +.erlang.cookie +ebin +log +erl_crash.dump +.rebar +logs +.idea +*.iml +rebar3.crashdump +*~ diff --git a/LICENSE b/LICENSE new file mode 100644 index 0000000..f288702 --- /dev/null +++ b/LICENSE @@ -0,0 +1,674 @@ + GNU GENERAL PUBLIC LICENSE + Version 3, 29 June 2007 + + Copyright (C) 2007 Free Software Foundation, Inc. + Everyone is permitted to copy and distribute verbatim copies + of this license document, but changing it is not allowed. + + Preamble + + The GNU General Public License is a free, copyleft license for +software and other kinds of works. + + The licenses for most software and other practical works are designed +to take away your freedom to share and change the works. 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If your program is a subroutine library, you +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 +. diff --git a/README.md b/README.md new file mode 100644 index 0000000..a7ff9b7 --- /dev/null +++ b/README.md @@ -0,0 +1,82 @@ +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 diff --git a/rebar.config b/rebar.config new file mode 100644 index 0000000..ef763d2 --- /dev/null +++ b/rebar.config @@ -0,0 +1,7 @@ +{erl_opts, [debug_info]}. +{deps, []}. + +{shell, [ + %% {config, "config/sys.config"}, + {apps, [gm_ctflow]} +]}. diff --git a/rebar.lock b/rebar.lock new file mode 100644 index 0000000..57afcca --- /dev/null +++ b/rebar.lock @@ -0,0 +1 @@ +[]. diff --git a/src/gm_ctflow.app.src b/src/gm_ctflow.app.src new file mode 100644 index 0000000..e89089a --- /dev/null +++ b/src/gm_ctflow.app.src @@ -0,0 +1,14 @@ +{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, []} + ]}. diff --git a/src/gm_ctflow.erl b/src/gm_ctflow.erl new file mode 100644 index 0000000..44c8882 --- /dev/null +++ b/src/gm_ctflow.erl @@ -0,0 +1,5 @@ +-module(gm_ctflow). + +-type flow() :: any(). + +-export_type([ flow/0 ]). diff --git a/src/gm_ctflow_app.erl b/src/gm_ctflow_app.erl new file mode 100644 index 0000000..6848e4e --- /dev/null +++ b/src/gm_ctflow_app.erl @@ -0,0 +1,18 @@ +%%%------------------------------------------------------------------- +%% @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 diff --git a/src/gm_ctflow_fun.erl b/src/gm_ctflow_fun.erl new file mode 100644 index 0000000..e7e260f --- /dev/null +++ b/src/gm_ctflow_fun.erl @@ -0,0 +1,38 @@ +-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). diff --git a/src/gm_ctflow_server.erl b/src/gm_ctflow_server.erl new file mode 100644 index 0000000..881bc9f --- /dev/null +++ b/src/gm_ctflow_server.erl @@ -0,0 +1,113 @@ +-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}. diff --git a/src/gm_ctflow_sup.erl b/src/gm_ctflow_sup.erl new file mode 100644 index 0000000..2c671fa --- /dev/null +++ b/src/gm_ctflow_sup.erl @@ -0,0 +1,55 @@ +%%%------------------------------------------------------------------- +%% @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. diff --git a/src/gm_ctflow_worker.erl b/src/gm_ctflow_worker.erl new file mode 100644 index 0000000..1298cc0 --- /dev/null +++ b/src/gm_ctflow_worker.erl @@ -0,0 +1,161 @@ +-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. diff --git a/src/gm_ctflow_worker_sup.erl b/src/gm_ctflow_worker_sup.erl new file mode 100644 index 0000000..29ec739 --- /dev/null +++ b/src/gm_ctflow_worker_sup.erl @@ -0,0 +1,50 @@ +%%%------------------------------------------------------------------- +%% @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] + }. diff --git a/test/gm_ctflow_SUITE.erl b/test/gm_ctflow_SUITE.erl new file mode 100644 index 0000000..1bf01c0 --- /dev/null +++ b/test/gm_ctflow_SUITE.erl @@ -0,0 +1,134 @@ +-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}.