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From: Alan Schmitt <alan.schmitt@polytechnique.org>
To: "lwn" <lwn@lwn.net>, "cwn"  <cwn@lists.idyll.org>, caml-list@inria.fr
Subject: [Caml-list] Attn: Development Editor, Latest OCaml Weekly News
Date: Tue, 27 Apr 2021 16:26:12 +0200
Message-ID: <87h7jrregr.fsf@m4x.org> (raw)

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Hello

Here is the latest OCaml Weekly News, for the week of April 20 to 27,
2021.

Table of Contents
─────────────────

docs.ocaml.pro : an OCaml Documentation Hub
Decompress 1.4.0
elliptic curves - maintainable and verified (full stack, from primitives to TLS)
First release of Docteur, an opiniated read-only file-system for MirageOS
Ocaml-solidity, a new OCaml library for Solidity
Migrating to floatarray (blog post)
Old CWN


docs.ocaml.pro : an OCaml Documentation Hub
═══════════════════════════════════════════

  Archive:
  <https://discuss.ocaml.org/t/ann-docs-ocaml-pro-an-ocaml-documentation-hub/7718/1>


Fabrice Le Fessant announced
────────────────────────────

  We are pleased to announce that we just published the first version of
  the OCaml Documentation Hub on:

  <https://docs.ocaml.pro>

  The OCaml Documentation Hub can be used to browse the sources and the
  documentations of more than 2000 opam packages, following links
  between them when useful. This is a work-in-progress, and we are
  working on improving it with many more features, such as source
  annotations with types, full-text and type-driven searches,
  improvements in the general readability of documentation, etc.

  The site is generated using an open-source tool called digodoc,
  available on:

  <https://github.com/OCamlPro/digodoc>

  Digodoc is able to build a map of an opam switch, with links between
  files, opam packages, ocaml libraries, meta packages and ocaml
  modules. It is also able to generate documentation using odoc with
  cross-indexes between all these kinds of packages.

  We welcome feedback and contributions!  Enjoy !


Simon Cruanes said and Anil Madhavapeddy added
──────────────────────────────────────────────

  Great work on this site, and I love the domain name as well ;-)

        The cross linking between packages is fantastic.

  As a bit of background on why documentation cross-linking has taken so
  long, there is a lonnnggg history intertwined with many people's
  contributions to opam, build systems (ocamlbuild and dune),
  conventions (findlib and odig) and of course [odoc] itself.  The major
  milestones along the way have been:

  • [odoc 1.0], first began in 2014 as a quick project to pull together
    typing information from cmt[i] files, but which ran into the problem
    that it needs a consistent set of compiled cmt files to actually
    work, and so needs help from external tools to pull that set of
    compiled libraries together.
  • [odig], which pulls together multiple opam packages (and a
    filesystem layout for metadata) and runs odoc on then. This allowed
    for the creation of <https://docs.mirage.io> a few years ago which
    cross-references a smaller number of packages
  • opam-repo itself has had better and better bulk builds over the
    years to ensure that we can actually automatically compile all the
    artefacts needed for docs builds, thanks to efforts like [health
    check] and [ocurrent].
  • odoc 2.0, which featured a multi-year [rewrite] of the OCaml module
    resolver and introduced a new [output IR].  This forthcoming release
    was presented in this [OCaml 2020 talk] by @jonludlam.

  And now with all these pieces in place, the OCaml documentation spring
  has arrived! The OCamlPro one posted here as the first of the "new
  batch" of mass documentation indexers, and I'm aware of concurrent
  efforts by the odoc/ocaml.org maintainer teams to push a central one
  out to ocaml.org, as well as by the MirageOS team who are refreshing
  docs.mirage.io with the latest and greatest.  I'm sure when the dust
  has settled on all these indexers we can look for common pieces, but
  for now it's lovely to see so much innovation happening at pace.

  For the community: now is the time to fix your docstrings in your
  libraries, as there will many cool tools parsing and processing them,
  and rendering them into all kinds of output formats!

  To the [odoc contributors], thank you! The journey to get to this
  documentation site started here seven years ago:

  ┌────
  │ commit ef91571cab31d9ece7af965ed52eaaff57a12efc
  │ Author: Leo White <lpw25@cl.cam.ac.uk>
  │ Date:   Thu Oct 16 19:20:18 2014 +0100
  │ 
  │     Initial commit
  └────

  @lefessan one thing I'm not sure about in your site is the "copyright
  library authors" claim. That's murky legal ground – it's worth
  establishing if the odoc HTML has gone through a compilation process
  and so is no longer copyright the authors (just as a binary output is
  not copyright the original source code). If the output _is_ copyright
  the authors, then they have reasonable grounds to claim that you
  should also reproduce the copyright notice and other license
  restrictions. Personally, I prefer to claim that there is no copyright
  to the original authors in odoc output, and sidestep this issue.


[odoc] <https://github.com/ocaml/odoc>

[odoc 1.0] <https://github.com/ocaml/odoc>

[odig] <https://github.com/dbuenzli/odig>

[health check] <https://github.com/ocurrent/opam-health-check>

[ocurrent] <https://github.com/ocurrent/overview>

[rewrite] <https://github.com/ocaml/odoc/pull/439>

[output IR] <https://github.com/ocaml/odoc/pull/423>

[OCaml 2020 talk] <https://www.youtube.com/watch?v=wVyZ-KveN-w&t=3s>

[odoc contributors] <https://github.com/ocaml/odoc/graphs/contributors>


Fabrice Le Fessant replied
──────────────────────────

  Thanks @avsm , all these projects were indeed important milestones
  towards the creation of this site. However, I wouldn't want this
  history perspective to give the wrong feeling that building this site
  was easy, it is the result of a very good, long and hard work by the
  team at OCamlPro to make it work despite a road paved with many
  obstacles. It also benefited from OCamlPro's long history of
  innovative projects for the OCaml community, that lead for example in
  the past to Opam, [Try-OCaml], Memprof/[Memthol,] [Opam-builder],
  [Learn-OCaml], the Typerex tools (ocp-indent, ocp-index, ocp-build,
  etc.) and more recently [opam-bin] and [drom].

  As I said, this is a work-in-progress, and there are many features
  that we will be adding in the next months to make this website much
  easier to navigate, for users to rapidely reach the information that
  matters for them. We hope it will be inspirational for all the other
  developers who are working on similar projects, and we are looking
  forward to using their projects soon too!


[Try-OCaml] <https://try.ocamlpro.com/>

[Memthol,]
<https://www.ocamlpro.com/2020/12/01/memthol-exploring-program-profiling/>

[Opam-builder] <https://hal.inria.fr/hal-01352008>

[Learn-OCaml] <https://github.com/ocaml-sf/learn-ocaml>

[opam-bin] <https://github.com/OCamlPro/opam-bin>

[drom] <https://github.com/OCamlPro/drom/>


Daniel Bünzli said
──────────────────

  I'd just like to stress that `odig' documents OCaml package installs
  regardless of the package manager used as long the install structure
  follows [these conventions] (which are automatically followed by [dune
  installs]) .

  Also for people using my packages, I'd just like to mention they may
  miss important documentation bits on [https://docs.ocaml.pro] until
  [that issue] is resolved.


[these conventions]
<https://erratique.ch/software/odig/doc/packaging.html>

[dune installs]
<https://dune.readthedocs.io/en/stable/opam.html#odig-conventions>

[https://docs.ocaml.pro] <https://docs.ocaml.pro/>

[that issue] <https://github.com/OCamlPro/digodoc/issues/33>


Much later in the thread, Kiran Gopinathan said
───────────────────────────────────────────────

  It's not quite the same as hoogle, but merlin has a functionality to
  search for functions by type signature - the feature doesn't seem to
  get much attention apparently - probably the interface is a little
  lacking, but with some extra elisp tuning, it can work quite smoothly:

  <https://aws1.discourse-cdn.com/standard11/uploads/ocaml/original/2X/3/3c2d1c63fac7cbd7dd1bb5b9a406589e031cb795.gif>


Yawar Amin then added
─────────────────────

  The command line for this:

  ┌────
  │ ocamlmerlin single search-by-polarity -position 0 -query '-int +string'
  └────

  (To search for values of type `int -> string'.)


Decompress 1.4.0
════════════════

  Archive: <https://discuss.ocaml.org/t/ann-decompress-1-4-0/7724/1>


Charles Edouard Lecat announced
───────────────────────────────

Greetings everyone,
╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌

  I am happy to announce the new release of [decompress 1.4.0],
  available for installation via OPAM. Decompress is a library
  containing a pure OCaml implementation of several compression
  algorithms:
  • RFC1951
  • Zlib
  • Gzip
  • LZO

  It's goal is to provide several algorithms for both the inflation and
  the deflation of objects, in the form of a stream API allowing to call
  the chosen algorithm one bit at a time. Such behavior allows for an
  easy use of decompress in situations where we would not be able to
  have the input in one go, or where we would like to output the result
  in a non blocking way. This new release comes with several
  improvements to the documentation and bug fixes, but even more, with a
  whole new implementation for the rfc 1951 and zlib algorithms.


[decompress 1.4.0]
<https://github.com/mirage/decompress/releases/tag/v1.4.0>


Non-stream implementation for rfc 1951 and zlib
╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌

  Up to this day, decompress was used in several projects like
  ocaml-git. However, as time passed by, it appeared that in some cases,
  the current implementation of decompress was not the optimal solution:
  As useful as a stream implementation is, it requires to save a lot of
  information about the state of the compression, in order to resume it
  once we have enough input.

  This is why, in some cases where we would be sure that we have our
  whole input in one go, we might want to avoid all of these side-costs,
  and directly go to the point.


State of the art: libdeflate
┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄

  This new problematic in mind, we have started thinking about the
  existing implementations of these algorithms which were also bypassing
  the stream behavior. One implementation that proved to be a suitable
  example for our problem, was the library `libdeflate', an
  implementation in C. It's main advantages being: a better compression
  ratio than zlib and with faster runtime.

  It was used as the solid base for the OCaml implementation provided by
  this new release.


OCaml version of libdeflate, performances and use cases
┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄

  Inheriting the logic of libdeflate, the new implementation now has a
  better compression ratio, while being slightly faster at it. On the
  other side, the decompression is way faster, with `33% of speed
  increase in most tested cases: On the ~book2' (from the Calgary
  corpus) file:
  • `decompress' (stream): 15 Mb/s (deflation), 76 Mb/s (inflation),
    ratio: 42.46 %
  • `decompress' (non-stream): 17 Mb/s (deflation), 105 Mb/s
    (inflation), ratio: 34.66 %

  Now that this is in place, the users of decompress will be able to
  choose between the two versions, according to their needs. In the case
  of ocaml-git, the vast majority of the git objects are small and will
  be compressed in one go. This is why we updated with the new
  implementation when possible.


Writing optimized code and profiling it
┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄

  One of the biggest concerns of this release was to be able to produce
  optimized code. The base code being coded in C, a lot of sub-optimal
  behavior where ported in the OCaml version: `for' and `while' loops,
  references everywhere, mixes of `struct' and `union.', it needed a lot
  of clean up.

  This is why once the main iteration was done, we have spent several
  weeks profiling the code base, using the OCaml library `landmarks',
  `flamegraph' or simply the linux binary `perf'. This work, sometimes
  tedious, proved to be helpful and healthy for both the harmonization
  of the code and it's performances.


Decompress & MirageOS
┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄

  Compression algorithms are a really important piece in many projects,
  and operating systems do not avoid this.  `decompress' was coded from
  the start with the idea of being used in the much larger project
  MirageOS.

  This release is another opportunity to broaden MirageOS’s reach, by
  providing one more algorithm to it’s stack, allowing us to specialise
  even more the unikernels that would have a need for
  inflation/deflation algorithms. This more restrictive implementation,
  as we need to have the whole input in one go, will allow us to take
  advantage of the situation and give more flexibility for the user.

  The positive aspects of this release will most likely show up soon
  enough, as we make use of decompress to its full potential


elliptic curves - maintainable and verified (full stack, from primitives to TLS)
════════════════════════════════════════════════════════════════════════════════

  Archive:
  <https://discuss.ocaml.org/t/ann-elliptic-curves-maintainable-and-verified-full-stack-from-primitives-to-tls/7729/1>


Hannes Mehnert announced
────────────────────────

  over the last month I worked on upgrading the cryptography stack for
  OCaml and MirageOS. I just published a [blog post]. Enhancments of
  [OCaml-TLS] ([usenix security paper from 2015]) and [X.509] are in
  place.

  The main achievement after TLS 1.3 support (since May 2020, 0.12.0) is
  that elliptic curve certificates are now supported. Elliptic curve
  cryptography uses [fiat]. The X509 implementation now supports PKCS 12
  (used by browsers and other software (e.g. OpenVPN) to bundle
  certificates and private keys).

  Get mirage-crypto-ec, x509 0.13.0 and tls 0.13.1 (all available in the
  opam-repository). Discussion and feedback appreciated.


[blog post] <https://hannes.robur.coop/Posts/EC>

[OCaml-TLS] <https://github.com/mirleft/ocaml-tls>

[usenix security paper from 2015] <https://usenix15.nqsb.io>

[X.509] <https://github.com/mirleft/ocaml-x509>

[fiat] <https://github.com/mit-plv/fiat-crypto>


First release of Docteur, an opiniated read-only file-system for MirageOS
═════════════════════════════════════════════════════════════════════════

  Archive:
  <https://discuss.ocaml.org/t/ann-first-release-of-docteur-an-opiniated-read-only-file-system-for-mirageos/7743/1>


Calascibetta Romain announced
─────────────────────────────

  I'm glad to announce the first release of [`docteur'], a simple tool
  to make and use (in read-only) a "file-system" for [MirageOS]. As you
  know, with MirageOS, we don't have _sockets_, _kernel space_ or even
  _file-descriptor_. It's not possible to manipulate files
  _standalonely_ and many _primitives_ commonly available with the
  `unix' module don't exists in our space.

  Therefore, it is difficult to imagine making a website that displays
  local files or a database system. But in our spirit of separation of
  services, it becomes possible for your unikernel to communicate over
  the network to a "file system" or a database.

  For quite some time we have been experimenting with a file system
  external to our unikernel called Git. This is the case of [`pasteur']
  which saves the pastes in a Git repository. It is also the case of
  [`unipi'] or [Canopy] which display the content of a Git repository
  and can resynchronize with it using a hook. Or the case of [our
  primary DNS server] whose zone file comes from a Git repository - we
  can then trace all the changes on this file.

  However, we have several limitations:
  1) it requires the Git repository to load into memory in your
     unikernel
  2) it requires a communication (external with GitHub or internal in a
     private network)

  The persistent aspect is very important. We should always be able to
  launch a unikernel and not lose the data if our system shuts down.

  The mutable aspect (modify a file) is useful in some cases but not in
  others. As for `unipi' for example (a simple static web site), the
  difference between resynchronizing with a hook or restarting the
  unikernel with a new version of your filesystem is minor.


[`docteur'] <https://github.com/dinosaure/docteur>

[MirageOS] <https://mirage.io/>

[`pasteur'] <https://github.com/dinosaure/pasteur>

[`unipi'] <https://github.com/roburio/unipi>

[Canopy] <https://github.com/Engil/Canopy>

[our primary DNS server] <https://github.com/roburio/dns-primary-git>

Docteur as a second solution
╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌

  This is where Doctor comes in. It solves both of our problems by
  offering the generation of a file system from scratch:
  • a Git repository (local or available on a service)
  • a specific folder

  Doctor is able to create a complete representation of a folder and to
  compress it at such a ratio that a generation of the documentation of
  several OPAM packages with all their versions making 14 Gb is reduced
  to an image of only 280 Mb!

  Such a high compression ratio is in particular due to a double level
  of compression by [`decompress'] and [`duff']. For more details,
  Docteur just generates a slightly modified PACK file with [carton].

  Then, Docteur proposes a simple library which makes available 2 ways
  to manipulate this image for your unikernel:
  1) a way that is fast but with a consequent boot time
  2) a slower way but with no cost to the boot time

  The first way will simply "analyze" the image to re-extract the layout
  of your file system. Then it uses the [ART data-structure] to save
  this layout. So, whenever you want a specific file and according to
  [ART benchmarks], you have access to the content very quickly.

  The problem remains the analysis which takes place at boot time and
  which can take a very long time (it depends essentially on the number
  of files you have). There can also be an impact on memory usage as the
  ART data structure is in memory - the more files there are, the bigger
  the structure is.

  The second method is more "silly". Each time you request a file, we
  will have to rebuild the entire path and therefore deserialize several
  objects (like folders). The advantage is that we don't analyze the
  image and we don't try to maintain a layout of your file system.


[`decompress'] <https://github.com/mirage/decompress>

[`duff'] <https://github.com/mirage/duff>

[carton] <https://github.com/mirage/ocaml-git/tree/master/src/carton>

[ART data-structure] <https://github.com/dinosaure/art>

[ART benchmarks] <https://dinosaure.github.io/art/bench/find.html>


Example
╌╌╌╌╌╌╌

  Docteur is meant to be simple. The generation of the image is done
  very simply by the command `make':
  ┌────
  │ $ docteur.make -b refs/heads/main https://github.com/dinosaure/docteur disk.img
  │ $ docteur.make -b refs/heads/main git@github.com:dinosaure/docteur disk.img
  │ $ docteur.make -b refs/heads/main git://github.com/dinosaure/docteur disk.img
  │ $ docteur.make -b refs/heads/main file://$(pwd)/dev/docteur disk.img
  └────

  Then, Docteur proposes 2 supports: Unix & [Solo5]. For Unix, you just
  have to name explicitly the image file to use. For the case of Solo5
  (and thus of virtualization). You just have to find a name for a
  "block device" and to reuse this name with the Solo5 "tender"
  specifying where the image is.
  ┌────
  │ $ cd unikernel
  │ $ mirage configure -t unix --disk disk.img
  │ $ make depends
  │ $ mirage build
  │ $ ./simple --filename README.md
  └────

  ┌────
  │ $ cd unikernel
  │ $ mirage configure -t hvt --disk docteur
  │ $ make depends
  │ $ mirage build
  │ $ solo5-hvt --block:docteur=disk.img -- simple.hvt --filename README.md
  └────

  Finally, Docteur proposes another tool that checks (and analyzes) an
  image to give you the version of the commit used (if the image comes
  from a Git repository) or the hash of your file system produced by the
  calculation of a [Merkle tree].
  ┌────
  │ $ docteur.verify disk.img
  │ commit	: ad8c418635ca6683177c7ff3b583e1ea5afea78f
  │ author	: "Calascibetta Romain" <romain.calascibetta@gmail.com>
  │ root	: bea10b6874f51e3f6feb1f9bcf3939933b2c4540
  │ 
  │ Merge pull request #11 from dinosaure/fix-tree-expanding
  │ 
  │ Fix how we expand our file-system
  └────


[Solo5] <https://github.com/Solo5/solo5>

[Merkle tree] <https://en.wikipedia.org/wiki/Merkle_tree>


Conclusion
╌╌╌╌╌╌╌╌╌╌

  Many times people ask me for a purpose in MirageOS such as a website
  or a particular service. I think that Docteur shows one essential
  thing about MirageOS, it is a tool and an ecosystem. But it's not an
  endpoint that is concretized in a specific application.

  Docteur is not THE solution to our problems and answers a specific use
  case. What is important to note is not what Docteur does but the
  possibility for our ecosystem and our tools to allow the development
  of Docteur. As it allows the development of a trillion applications!

  As such, I say to those people to "play" with MirageOS if they want to
  learn more. Our goal is not to show you applications that you could
  then deploy easily (even if we are working on this aspect too) but to
  give you the possibility to imagine your OS (independently from our
  vision)!

  And if you try, we'll be happy to help you!


Ocaml-solidity, a new OCaml library for Solidity
════════════════════════════════════════════════

  Archive:
  <https://discuss.ocaml.org/t/ocaml-solidity-a-new-ocaml-library-for-solidity/7746/1>


OCamlPro announced
──────────────────

  We are pleased to announce our new OCaml library, ocaml-solidity !
  [Ocaml-solidity] is a program manipulation library that provides a
  Solidity parser and typechecker.

  Our library is made for developers on Solidity code analysis, it
  builds a typechecked AST that can be analyzed with a provided
  visitor. Please note that our parser and typecheck conforms mostly to
  Solidity 0.7, inline assembly is not supported. Take a look at [our
  documentation].

  You can test it and report bugs just [here]!


[Ocaml-solidity] <https://github.com/OCamlPro/ocaml-solidity>

[our documentation] <https://ocamlpro.github.io/ocaml-solidity/>

[here] <https://github.com/OCamlPro/ocaml-solidity/issues>


Migrating to floatarray (blog post)
═══════════════════════════════════

  Archive:
  <https://discuss.ocaml.org/t/migrating-to-floatarray-blog-post/7749/1>


Nicolás Ojeda Bär announced
───────────────────────────

  At LexiFi we recently migrated our codebase to use `floatarray' in
  place of `float array' in order to disable the "flat float array" mode
  in the compiler. If you are interested in finding out more about how
  we did it, we wrote a blog post about it
  <https://www.lexifi.com/blog/ocaml/floatarray-migration/>. Enjoy!


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 look at [the archive] or the [RSS feed of the
  archives].

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

  [Alan Schmitt]


[send me a message] <mailto:alan.schmitt@polytechnique.org>

[the archive] <https://alan.petitepomme.net/cwn/>

[RSS feed of the archives] <https://alan.petitepomme.net/cwn/cwn.rss>

[online] <http://lists.idyll.org/listinfo/caml-news-weekly/>

[Alan Schmitt] <https://alan.petitepomme.net/>


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