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OCaml Weekly News

Previous Week<= /a> Up Next Week

Hello

Here is the latest OCaml Weekly News, for the week of February 22 to March = 01, 2022.

data-encoding.0.5 release

Archive: https://discuss.ocaml.org/t/ann-data-encoding-0-5-release/9420/1=

Rapha=C3=ABl Proust announced

On behalf of Nomadic Labs, I'= m happy to announce the release of data-encoding version 0.5.

This new version brings several bug fixes, some increased test coverage, mi= nor improvements in the API, and a major new feature:

Compact encodings: sub-byte tag sizes

This new version provides a new set of combinators for compact encodings. These compact encodings will handle all the verbose and error-prone bit-twidling process needed to combine multiple= sub-byte discriminators into a single byte-size one.

E.g., the encoding let e1 =3D either (either bool unit) (option bool)= uses three bits in the shared tag and zero bytes after that; the encoding let e2 =3D either int32 int64 uses one bit in the= shared tag and either 4 or 8 bytes to represent the integer; the product encoding let ee =3D tup2 e1 e2 uses four (3 + 1) b= its in the shared tag and either 4 or 8 bytes to represent the integer of e2.

How to get

The code is available under MIT license on https://gitlab.com/nomadic-labs/data-encoding.

It can be installed via opam.

Dario Teixeira asked and Rapha=C3=ABl Proust replied<= /h3>

Hi @raphael-proust! I have a question regarding the connection between data-encoding and json-data-encoding, also developed at Nomadic Labs. The latter seems tied to JSON, whereas the forme= r is more flexible, supporting also binary encodings. However, since data-encoding also supports JSON, do= esn't it subsume json-data-encoding completely?

The data-encoding library uses json-data-encoding= for its JSON backend. It delegates conversion from OCaml values into and from JSON to the primitives provided in the interface of jso= n-data-encoding.

In a way, yes, as an end-user you don't need to use json-data-encodin= g directly because you can use the Json module of data-encoding instead. There are three possible reas= ons why you might add json-data-encoding as a (non-transitive) dependency to your project and use it directly in your cod= e:

  • You want to keep the dependency set and the number of abstraction layer= s as small as possible. E.g., in order to reduce binary size.
  • You want some static guarantees that some encodings are only every used= for JSON. E.g., in your logging system.
  • You need to define a JSON encoding which is rejected by data-enco= ding on grounds that it is invalid in binary. Note that
    • This is very specific to some combinators but basically some combinator= s will reject their inputs (raise Invalid_argument) because us= ing the serialiser would lead to undecodable data. Most typically, this hap= pens if you try to concatenate two fields of unknown length. Decoding the r= esult becomes a guessing game as to were one field stops and where the next= begins. These could easily be represented as an array in JSON which includ= es all the delimiters you need to decode it.
    • There are other workarounds (e.g., prefixing the fields with a length f= ield), but going for the JSON encoding directly is a valid approach if you = only need JSON.

Rapha=C3=ABl Proust later announced

Version 0.5.1 of the data-encoding has just been released.

This is a bugfix release making one of the library's internal checks more p= ermissive. Without this fix (i.e., using version 0.5), some valid encodings are rejected (raising Invalid_argu= ment) by the library.

You can update via opam: opam install data-encoding.0.5.1

Tutorial: Roguelike with effect handlers

Archive: https://discuss.ocaml.org/t/tutorial-roguelike-with-ef= fect-handlers/9422/1

art-w announced

The recent conversations about eio 0.1 and agnostic blocking have made me very curious about effect handlers. The multicore team has done an awesome job with their tutor= ials, examples and talks, but the laymen have been too quiet for such an exciting feature! Where are all the blog posts about how = "you could have invented algebraic effects" and "one-shot continuations are like spaghetti"?

In any case, I'm hoping to tease some of you into trying them out with a simple tutori= al about programming a roguelike with effect handlers :)

There's nothing new here besides the fun use-case! So if you already have a= n intuitive understanding of the syntax and motivations, you may be more interested by a deeper look at the scope of effect handlers – and a soft introduction to some less common features of the type system. (this link was previously posted deep into = the eio thread)

I would be grateful if you spot any mistake! I'm also curious of other fun = applications for effect handlers… and if you feel like sharing your own surprises and discoveries, I believe it coul= d really help others learn faster :)

Kiran Gopinathan then said

Great blog post! That seems like a very elegant implementation!

Funny you should make a rougelike :smiley: , I guess effect handlers + game= s might be popular for games, because I also had a blog post about effect handlers and their applications, in parti= cular for games, although in my case it was for animations:

https://gopiandcode.uk/logs/log-bye-bye-monads-algebraic-effects.htm= l

gasche also replied

Note: the "upstream" status of effect handlers is a little uncertain/confus= ing right now. Your blog post (I didn't get a chance to read it yet, but it sounds very nice!) uses the experimenta= l syntax of multicore-4.12+effects, but that syntax was intentionally not upstreamed, and it will not= be part of OCaml 5.0.

I think there is a risk of confusion because the community is aware that Mu= lticore OCaml has effect handlers, and also that Multicore OCaml has been merged upstream. So it can be tempting t= o believe that the upcoming OCaml release (or maybe one or two releases after that, we said the first Multicore relea= se would be more like a preview) will support effect handlers as a language feature. It will not! Effects as a la= nguage feature were removed from Multicore OCaml before the upstream merge. And no one knows if/when they will = be supported upstream.

So: I think that your blog posts on using effect handlers could have somewh= ere a short mention that the code is using an experimental extension of OCaml that is not supported by the upstream im= plementation.

The reasoning for this choice is that we want to give a chance to a type sy= stem for effect handlers, but that still need quite a bit more time than the Multicore runtime itself. We don't want= to encourage the ecosystem to rely on untyped effects, if it means a lot of pain upgrading to typed effects later= (or risk having to support both).

5.0 only contains basic support for effect handlers as a runtime primiti= ve, but dos not support handlers as a language feature. I think they should be considered experimental: yo= u can rely on them for their intended purpose of exposing a flexible interface for concurrent fibers, but uses beyond tha= t may break in the future.

So, in a sense, we don't want people to use them. It's of course fine to us= e experimental features from experimental forks of the OCaml compiler (effect handlers, modular implicits or explicit= s, runtime type representations and what not), and the people working on these experimental features do benefit from= other people trying them and giving them feedback. But we don't want people to depend on it in production, wh= atever that means. (For example, code using it is likely to get stuck on 4.12 forever and never see an upgrade to upcoming= OCaml versions, although of course people could choose to port the experimental branch forward.)

For Diversity and the OCaml Community: Outreachy Summer 2022

Archive: https://discuss.ocaml.org/t/for-di= versity-and-the-ocaml-community-outreachy-summer-2022/9234/4

Sonja Heinze announced

Just in case anyone is actually interested in this: the project submission = deadline has been extended from March 4th to March 23rd. So the updated timeline now looks as follows:

3D"534ca9a08bce=

where 2. and 3. probably need to be done a bit in parallel.

Bogue, the OCaml GUI

Archive: https://discuss.ocaml.org/t/ann-bogue-the-ocaml-gui/9099/23

sanette announced

Hi, some new developments. I have implemented a new Sdl_area w= idget where one can conveniently issue any SDL function (from the SDL Renderer API).

Here is (below) the new 'labelled graph' example. In this example I am usin= g regular "label" widgets for creating the nodes, and I am using an Sdl_area for drawing the lines.

The nice things for labels to be regular widgets is that one can click on t= hem. To demonstrate this, in this example they react to a click by jumping to another random location (with animation= ).

3D=

3D"d6958e266f27= 

open Bogue
module W =3D Widget
module L =3D Layout

let n =3D 15 (* number of discs *)
let radius =3D 20
let width =3D 800
let height =3D 600

let c =3D Draw.find_color "#e5b92c"
let cb =3D Draw.find_color "#7b6b35"
let disc_style =3D =
Style.(
    create ~border:(
      mk_border ~radius (mk_line ~color:Draw.(opaque c) ~width:1 ~style:Solid =
()))
      ~background:(color_bg Draw.(opaque cb)) ())

let background =3D =
L.style_bg Style.(
    of_bg (gradient ~angle:45. Draw.[opaque grey; opaque black]))

let fg =3D Draw.(opaque white)

let create_disc i (x,y) =3D
  let w =3D 2*radius + 1 in
  let bg =3D Box.create ~style:disc_style ~width:w ~he=
ight:w () in
  W.label ~fg (string_of_int i)
  |> L.resident ~background:(<=
span style=3D"color: #228b22;">L.box_bg bg) ~x:(x-radius) ~y:(y-r=
adius) ~w ~h:w

let move_disc (x,y) d =3D
  let (x0, y0)=
 =3D L.xpos d, L.ypos d in
  L.animate_x d (Avar.fromto x0 x);
  L.animate_y d (Avar.fromto y0 y)

let random_center _=
 =3D
  radius + Random.int (width - 2*rad=
ius),
  radius + Random.int (height - 2*ra=
dius)

let area =3D
  let sdlw =3D W.sdl_area ~w:width ~h:height () in
  let sdla =3D W.get_sdl_area sdlw in<=
/span>
  let centers =3D Arr=
ay.init n random_center in
  let color =3D Draw.=
(opaque grey) in<=
/span>
  let draw_lines rend=
erer =3D let open Draw in
    for i =3D 0 to n - 2 do
      let x0, y0 =3D to_pixels centers.(i) in
      let x1, y1 =3D to_pixels centers.(i+1) in
      line renderer ~color ~thick:6 =
~x0 ~y0 ~x1 ~y1
    done in
  Sdl_area.add sdla draw_lines;
  let discs =3D Array=
.mapi create_disc centers |> Array.to_list in
  (* move the disc when click on it *)
  List.iteri (fun i d ->
      W.on_click ~click:(fun _ ->
          centers.(i) <- random_center 0;
          Sdl_area.update sdla;
          let x,y =3D centers.(i) in
          move_disc (x - radius, y - radius) d) (L.widget d))
    discs;
  L.superpose ~w:width ~h:height =
~background (L.resident sdlw :: discs)

let board =3D Bogue=
.make []<=
/span> [area]

let () =3D Bogue.run board

Friday 03/04 Intern presentations – open attendance!

Archive: https://discuss.ocaml.org/t/friday-03-04-int= ern-presentations-open-attendance/9429/1

Aya announced

This is Aya, one of the three Outreachy<= /a> interns working on OCaml this winter :camel: After 3 very fast months, our internships are already coming to a close. We have = had such a great time working on our projects and learning OCaml that we want to hold an event to mark the end o= f the internships, and we decided to open it up to the community :tada:

As you might have seen in the initial announcement, @pitag @shonfeder @gs0510 @tmattio and @pkel all volunteered to mentor us from December 2021 to now. = Thank you all so so much for mentoring us and introducing us to OCaml :heart: :fire: It's been such an enjoyable expe= rience!

We are inviting anyone who is interested to attend a virtual session of 3 s= hort presentations on Friday, March 4th, 4-5pm CET (we will post the link to join on Thursday). There will be ti= me for Q&A after each presentation, and the whole session will be recorded and posted online shortly after as well.

  • @ayc9 will present on updating a standard PPX deriver (mentors: @pitag = @shonfeder)
  • @SaySayo will present on syntax highlighting and other updates to the v= scode extension (mentors: @tmattio @gs0510)
  • @JiaeK will present on building a basic monitoring dashboard for ocaml.org (mentors: @tmattio)

We hope you can make it!

-@ayc9 @SaySayo @JiaeK

Affect: Composable concurrency primitives for OCaml 5.0

Archive: https://discuss.ocaml.org/t/affect-comp= osable-concurrency-primitives-for-ocaml-5-0/9430/1

Daniel B=C3=BCnzli announced

I looked a bit into the kind of fiber abstraction and concurrency structure= I would like to use with the new tools OCaml 5.0 is going to offer. You can find some results in affect's Fiber module.

This fiber abstraction supports terminating by returning values or abnormal= ly (by aborting or via a spurious exception). Termination of a fiber is aligned on function scopes: all the f= ibers spawn by a fiber function have to terminate in order for it to terminate.

This means that if your fiber returns a value it waits for its spawns to te= rminate (in any way) before returning the value. And if your fiber returns abnormally (uncaught eception or explicit = abort) it first aborts all its non-terminated spawns before returning abnormally =E2=80=93 this provides a= ffect's notion of cancellation.

Explicit fiber aborts raise the Abort exception in fibers. Com= bined with a disciplined use of Fun.protect and an optional finally handler specified at fiber spawn, this lets t= hem release the ressources they may hold when it's time to say goodbye.

The module also provides a generic way of blocking and unblocking fibers th= at you can use to interface with your favourite event loop. It does so without requiring to fiddle with effects, = you just need to make judicious use of Fiber.block and provide a suitable function to Fiber.run's built-in scheduler to let it know about fibers = that can be unblocked.

A grab bag of comments:

  1. The first goal of affect is to seek a concurrency and abort structure t= hat are easy to understand, use and compose with event loops. Right now som= e efficiency and implementation aspects need to be improved. This will like= ly change the exposed set of primitive effects which doesn't feel exactly r= ight yet (if you want to build your own scheduler).
  2. I use abort rather than cancel terminology. From my non-native english = speaker perspective, cancelling is more about not doing something that was = planned but didn't happen yet. Aborting is more about stopping something th= at is going on. It also melds better with the uncaught exception case.
  3. Say no to unit soups! Let fibers return values.
  4. At that point I don't feel the need to add a promise/future abstraction= to the toolbox. The whole point of direct style is to get rid of this asyn= c madness.
  5. There's no synchronisation structure yet. Semaphores are always useful = for throttling so I'll certainly add that at some point or a more fundament= al primitive like an mvar.
  6. The Funix module has a few fiber friendly Unix= module functions for playing with timers and the network, see ping.ml for an example of use. In practice you want to be able to use som= ething else than select(2) though. There are various ways one = could go about this, see for example point 6. in these design notes.
  7. The mouse.ml has a basic example on how to interface wit= h the SDL event loop which provides another example on how one goes to inte= rface Fiber with event loops.

I'm not fully convinced by everything yet. It will certainly need one or tw= o more design rounds. If you try it, feel free to comment or make suggestio= ns on the issue tracker.

Home page: https://erratiq= ue.ch/software/affect

API docs: https://err= atique.ch/software/affect/doc/ (or odig doc affect)

Install: 

opam switch create 5.0.0+trunk
opam pin add https://erratique.ch/repos/affect.git

Segfault Systems Joins Tarides

Archive: https://discuss.ocaml.org/t/segfault-systems-joins-tarides/9431= /1

Thomas Gazagnaire announced

@kayceesrk and I are delighted to announce that Segfault Systems, a spinout= from IIT-Madras, is joining Tarides. Tarides has worked closely with Segfault Systems over the last couple of ye= ars, most notably on the award-winning Multicore OCaml project and the upstreaming plans for OCaml 5.0. This allia= nce furthers the goals of Tarides, bringing the compiler and benchmarking expertise of the Segfault team direc= tly into the Tarides organisation, where it can be commercially funded and supported.

All of Segfault Systems=E2=80=99 existing responsibilities and open-source = commitments will migrate over to Tarides, where work will continue towards the three main objectives in 2022:

  • Releasing OCaml 5.0 with support for domains and effect handlers
  • Supporting the ecosystem to migrate the OCaml community over to OCaml 5= .0
  • Improving developer productivity for OCaml 5.0 by releasing the best pl= atform tools

This alliance will complement the commercial offerings of Tarides – = already strengthened by the integration of OCaml= Labs – and contribute to Tarides=E2=80=99 mission: empowering developers, communities, and organisations to adopt OCaml as the= ir primary programming experience by providing training, expertise, and development services around the OCaml la= nguage.

Read the full announcement here, including details of our goals and the focus for 2022. This alliance brings the headc= ount of Tarides up to 60+ people, all working towards making OCaml the best language for any and every project. J= oin our team and reach out for commercial services at https://tarides.com/.

OCaml User Survey 2022

Archive: https://discuss.ocaml.org/t/ann-ocaml-user-survey-2022/9433/1

Kim Nguy=E1=BB=85n announced

we are delighted to announce the OCaml User Survey 2022. With this survey, the OCSF is trying to get a better picture of the OCaml community and its needs= . It would be very helpful if you could take a few minutes (10 to 15) to fill the survey and share it with other OC= aml programmers.

https://forms.gle/oKy2Joz1c= ZhCPNtf6

The survey is run by the OCaml Software F= oundation. It builds on the previous iteration issued in 2020. The results will be published here on discuss and on the website of th= e OCSF. We would like to particularly thank @cjr for his help as well as everyone who commented on the previous survey. We t= ried our best to take all remarks into account but surely missed something. Don't hesitate to give us your feedbac= k (you can post here or send me a message/email).

The survey will remain opened until March 11th 2022 (AOE).

Old CWN

If you happen to miss a CWN, you can send me a message and I'll mail it to you, or go take a loo= k at the archive or the <= a href=3D"https://alan.petitepomme.net/cwn/cwn.rss">RSS feed of the archive= s.

If you also wish to receive it every week by mail, you may subscribe online.

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