package http-mirage-client

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HTTP client for MirageOS

Install

Dune Dependency

Authors

Maintainers

Sources

http-mirage-client-0.0.6.tbz
sha256=aed97be8d251630491360379eefd0ac1495c0ec190d8c47ecb964355fe0eb63b
sha512=3fbe6d0a7d633088c4b488993e16264bcfa7a2ea116abdda7628bcd403fad3992b3c272248b8818c182bea53610bc986e4c12c9bdffcf92a2a1f6f6bce0e8f9d

Description

Published: 12 Jul 2024

README

An HTTP (http/1.1 or h2) client for MirageOS

This little library provides an HTTP client which can be usable inside a unikernel/MirageOS. It follows the same API as http-lwt-client which is pretty simple and uses:

This library wants to be easy to use and it is associated to a MirageOS device in order to facilite functoria to compose everything (mainly the TCP/IP stack) according to the user's target and give a witness so as to be able to allocate a new connection to a peer and process the HTTP flow.

How to use it?

First, you need to describe a new http_client device:

open Mirage

type http_client = HTTP_client
let http_client = typ HTTP_client

let http_client =
  let connect _ modname = function
    | [ _pclock; _tcpv4v6; ctx ] ->
      Fmt.str {ocaml|%s.connect %s|ocaml} modname ctx
    | _ -> assert false in
  impl ~connect "Http_mirage_client.Make"
    (pclock @-> tcpv4v6 @-> git_client @-> http_client)

Then, you can decide how to construct such device:

let stack = generic_stackv4v6 default_network
let dns   = generic_dns_client stack
let tcp   = tcpv4v6_of_stackv4v6 stack

let http_client =
  (* XXX(dinosaure): it seems unconventional to use [git_happy_eyeballs] here
     when we want to do HTTP requests only. The name was not so good and we
     will fix that into the next release of the mirage tool. But structurally,
     you don't bring anything related to Git. It's just a bad choice of name. *)
  let happy_eyeballs = git_happy_eyeballs stack dns
    (generic_happy_eyeballs stack dns) in
  http_client $ default_posix_clock $ tcp $ happy_eyeballs

Finally, you can use the witness into your unikernel.ml:

open Lwt.Infix

module Make (HTTP_client : Http_mirage_client.S) = struct
  let start http_client =
    let body_f _response acc data = Lwt.return (acc ^ data) in
    Http_mirage_client.one_request http_client "https://mirage.io/" body_f ""
    >>= function
    | Ok (resp, body) -> ...
    | Error _ -> ...
end

Dependencies (10)

  1. h2 >= "0.10.0"
  2. httpaf
  3. mimic-happy-eyeballs >= "0.0.9"
  4. lwt >= "5.5.0"
  5. tcpip >= "7.0.0"
  6. mirage-time >= "3.0.0"
  7. mirage-clock >= "4.0.0"
  8. paf >= "0.2.0" & < "0.7.0"
  9. ocaml >= "4.11.0"
  10. dune >= "2.3"

Dev Dependencies (4)

  1. mirage-time-unix with-test & >= "3.0.0"
  2. mirage-crypto-rng with-test
  3. mirage-clock-unix with-test & >= "4.0.0"
  4. alcotest-lwt with-test

Conflicts

None

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