OCaml Weekly News

We are glad to announce the release of version 5.4.2 of Lwt: a bugfix-only release.

https://github.com/ocsigen/lwt/releases/tag/5.4.2

You can update to this version in opam :

opam update
opam upgrade lwt

Thanks to the contributors for finding and fixing the bugs, leading to this release. Check out the release notes (link above) for a full list.

The OCaml Workshop will be held virtually, just like last year. We are looking for volunteers to fill the role of session host.

We are happy to announce two opam releases: the freshly new 2.1.0 & the LTS support 2.0.9.

I'm glad to announce that version 3.5 of containers has just been released. There's a bugfix for bitvectors, and a tasteful assortment of new functions (see changelog). I want to thank all the contributors, among whom first time contributor @favonia.

The release and changelog can be found here

We have a small project (possibly only days of work) for an experienced OCaml and C++ programmer. If you are available for a short engagement as a contractor, please DM me. Thank you.

I am pleased to announce v3.0.1 of http-multipart-formdata. This release follows a major overhaul of the parser as well as the design of the library. Here is the summary of changes:

1. Flatten module Part_header to part_header
2. Implement reader/pull based parser to retrieve multipart parts, i.e. implement a streaming design. This is very useful if the HTTP file upload is large.
3. Implement push-based incremental input model, i.e. the library is now a non-blocking multipart parser
4. Remove dependency on IO based libs such as lwt, async since it is no longer needed due to point 3 above.

Github repo: http-multipart-formdata

API doc : API manual

I am pleased to announce v2.0.0 release of wtr (Well Typed Router). wtr is a trie-based router for OCaml HTTP web applications.

v2.0.0 release adds support for specifying and matching HTTP methods in a router. So now we can do the following;

Wtr.(
    create
      [ {%wtr| get,post,head,delete  ; /home/about/  |} about_page
      ; {%wtr| head                  ; /home/:int/   |} prod_page
      ]

Note: we can specify single or multiple HTTP methods supported by a route.

The release also features a pretty-printer - Wtr.pp - for a Wtr.t type. This has proven to be very useful when diagnosing/understanding routing issues. Sample output below,

POST
  /home
    /about
      /
    /:float
      /
HEAD
  /home
    /about
      /
    /:int
      /

The manual has also been improved in this release.

• wtr API
• CoHTTP demo
• CLI demo
• Changes v2.0.0

Haven't watched them all yet, but these look like they'd be a great resource for anyone wanting to learn OCaml: https://www.youtube.com/watch?v=MUcka_SvhLw&list=PLre5AT9JnKShBOPeuiD9b-I4XROIJhkIU

Here are links from many OCaml blogs aggregated at OCaml Planet.

• opam 2.1.0 is released!
• opam 2.0.9 release