hi all, I was able to use the libpact_ffi library ...
# libpact_ffi-usersp
Priyaranjan Mudliar
05/17/2023, 9:52 AMhi all, I was able to use the libpact_ffi library and wrote a C interface on top of that for my erlang code to use ! What do y’all think of this as a pact client for erlang
Example usage :
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%% pact-erlang (very pre-alpha phase right now)
%% Setup
PactRef = pact:create_new_pact(<<"consumer">>, <<"producer">>).
InteractionRef = pact:create_new_interaction(PactRef, <<"/users api desc">>).
pact:insert_request_path(InteractionRef, <<"GET">>, <<"/users">>).
ResponseJsonString = jsx:encode(#{auth_id => 1}).
pact:insert_response_body(InteractionRef, <<"application/json">>, ResponseJsonString).
pact:insert_response_status(InteractionRef, 200).
pact:create_mock_server(PactRef, <<"localhost">>, 1234, <<"http">>).
%% Sample test code
Users = user:get_users(),
%% Verify
assertEqual({ok, matched}, pact:verify_pact(1234)).
%% Write Pact File
pact:write_pact_file(PactRef, "/Users/priyaranjan.m/pacts", 0)
%% Cleanup test setup
pact:cleanup_pact_setup()Priyaranjan Mudliar
05/17/2023, 9:56 AM1. Not a DSL as other languages have implemented, but I believe very much usable any erlang user who wants to use pact features.
2. Haven’t implemented matchers implementation in a module as of now, but I believe its something that can be used manually using integrationjson.md page
Priyaranjan Mudliar
05/17/2023, 10:00 AMAnd this only uses the libpact_ffi.a and the pact.h which will be fetched from pact-reference release page, purely written in erlang and C
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Priyaranjan Mudliar
05/17/2023, 10:04 AMThe C interface can also be used for elixir applications too, as elixir and erlang both support NIF
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Priyaranjan Mudliar
05/17/2023, 11:48 AM@Matt (pactflow.io / pact-js / pact-go) this C interface will also solve the problem that you mentioned here in the pact-elixir thread https://docs.pact.io/slack/pact-elixir.html:
As long as Elixr can speak a c interface (which it obviously can, because that is what Rustler ultimately does) and you can add a c compatible library to your package (which it sounds like you can), I?d strongly encourage you move away from having the need for rust on a target machine
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Matt (pactflow.io / pact-js / pact-go)
05/17/2023, 11:30 PM
Nice! I can’t speak too much for the Erlang idiomatics, but if the user of the package doesn’t need additional dependencies to compile and install native deps, just to run Erlang/Elixir code, then this is worth the effort.
Matt (pactflow.io / pact-js / pact-go)
05/17/2023, 11:31 PM
I would encourage making fuctions for the matchers etc., because they are so fundamental
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Matt (pactflow.io / pact-js / pact-go)
05/17/2023, 11:32 PM
the
insert_<fn>🆗 1
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Priyaranjan Mudliar
05/18/2023, 7:42 AMdo you think dsl type syntax is neede here also, or only the naming that needs to change (from insert_<fn> to for example with_request()) ?
Priyaranjan Mudliar
05/18/2023, 7:43 AM@Matt (pactflow.io / pact-js / pact-go) yes the user will not need any external dependency like rust / rustler.
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Matt (pactflow.io / pact-js / pact-go)
05/19/2023, 5:15 AM
I’m more interested in keeping the naming of functions similar to other languages. As the vast majority of examples out there today won’t be elixir/erlang, anybody searching for examples of how to do X might encounter e.g. JS, so it’s important they can have some familiarity as the move between languages
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