add OCaml httpun using eio

frameworks/OCaml/httpun/README.md

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+# httpun Benchmarking Test
+
+### Test Type Implementation Source Code
+
+* [JSON](httpun_unix.ml)
+* [PLAINTEXT](httpun_unix.ml)
+
+## Important Libraries
+The tests were run with:
+* [HTTP library](https://github.com/anmonteiro/httpun)
+* [Concurrency library](https://github.com/ocaml-multicore/eio)
+
+## Test URLs
+### JSON
+
+http://localhost:8080/json
+
+### PLAINTEXT
+
+http://localhost:8080/plaintext

frameworks/OCaml/httpun/benchmark_config.json

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+{
+  "framework": "httpun",
+  "tests": [
+    {
+      "default": {
+        "json_url": "/json",
+        "plaintext_url": "/plaintext",
+        "port": 8080,
+        "approach": "Realistic",
+        "classification": "Platform",
+        "database": "None",
+        "framework": "None",
+        "language": "OCaml",
+        "flavor": "None",
+        "orm": "None",
+        "platform": "httpun",
+        "webserver": "None",
+        "os": "Linux",
+        "database_os": "Linux",
+        "display_name": "httpun",
+        "notes": "",
+        "versus": "None"
+      }
+    }
+  ]
+}

frameworks/OCaml/httpun/dune

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+(executable
+ (name httpun_eio)
+ (libraries httpun httpun-eio eio eio_main eio_linux yojson unix))

frameworks/OCaml/httpun/dune-project

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+(lang dune 3.9)

frameworks/OCaml/httpun/httpun.dockerfile

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+# -*- mode: dockerfile -*-
+
+# https://github.com/rbjorklin/techempower-ocaml-image
+# Use pre-built image with all dependencies for faster test times
+FROM rbjorklin/techempower-ocaml-image:5.3.0-4debebb5
+
+# https://caml.inria.fr/pub/docs/manual-ocaml/libref/Gc.html
+# https://linux.die.net/man/1/ocamlrun
+# https://blog.janestreet.com/memory-allocator-showdown/
+ENV OCAMLRUNPARAM="a=2,o=240"
+
+COPY . /app
+
+WORKDIR /app
+
+RUN \
+  eval $(opam env) && \
+  dune build --release httpun_eio.exe
+
+EXPOSE 8080
+
+ENTRYPOINT ["_build/default/httpun_eio.exe"]

frameworks/OCaml/httpun/httpun_eio.ml

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+open Httpun
+open Httpun_eio
+open Eio.Std
+
+(* Heavily inspired by the original httpaf implementation in this repo with eio additions from:
+ * https://github.com/ocaml-multicore/eio/blob/8f7f82d2c12076af8e9b8b365c58ebadaa963b8c/examples/net/server.ml
+ * https://github.com/ocaml-multicore/eio/blob/8f7f82d2c12076af8e9b8b365c58ebadaa963b8c/examples/net/main.ml
+ * https://github.com/anmonteiro/httpun/blob/37fdcd8fd09dc851acbf224c4ec1cb8681942f04/examples/lib/httpun_examples.ml#L115-L125
+ * https://github.com/anmonteiro/httpun/blob/37fdcd8fd09dc851acbf224c4ec1cb8681942f04/examples/eio/eio_connect_server.ml
+ *)
+
+(* Dates *)
+
+let get_date () = Unix.(gettimeofday () |> gmtime)
+
+let dow = function
+  | 0 -> "Sun"
+  | 1 -> "Mon"
+  | 2 -> "Tue"
+  | 3 -> "Wed"
+  | 4 -> "Thu"
+  | 5 -> "Fri"
+  | _ -> "Sat"
+
+let month = function
+  | 0 -> "Jan"
+  | 1 -> "Feb"
+  | 2 -> "Mar"
+  | 3 -> "Apr"
+  | 4 -> "May"
+  | 5 -> "Jun"
+  | 6 -> "Jul"
+  | 7 -> "Aug"
+  | 8 -> "Sep"
+  | 9 -> "Oct"
+  | 10 -> "Nov"
+  | _ -> "Dec"
+
+let date () =
+  let d = get_date () in
+  (* Wed, 17 Apr 2013 12:00:00 GMT *)
+  Format.sprintf "%s, %02d %s %4d %02d:%02d:%02d GMT" (dow d.tm_wday) d.tm_mday
+    (month d.tm_mon) (1900 + d.tm_year) d.tm_hour d.tm_min d.tm_sec
+
+let memo_date = ref @@ date ()
+
+let refresh_date () =
+  let f _ =
+    memo_date := date ();
+    ignore @@ Unix.alarm 1
+  in
+  (ignore @@ Sys.(signal sigalrm (Signal_handle f)));
+  f ()
+
+(* HTTP *)
+
+let request_handler (_ : Eio.Net.Sockaddr.stream) { Gluten.reqd; _ } =
+  let req = Reqd.request reqd in
+  match req.target with
+  | "/json" ->
+      let obj = `Assoc [ ("message", `String "Hello, World!") ] in
+      let payload = Yojson.to_string obj in
+      let headers =
+        Headers.of_rev_list
+          [
+            ("content-length", string_of_int @@ String.length payload);
+            ("content-type", "application/json");
+            ("server", "httpun");
+            ("date", !memo_date);
+          ]
+      in
+      let rsp = Response.create ~headers `OK in
+      Reqd.respond_with_string reqd rsp payload
+  | "/plaintext" ->
+      let payload = "Hello, World!" in
+      let headers =
+        Headers.of_rev_list
+          [
+            ("content-length", string_of_int @@ String.length payload);
+            ("content-type", "text/plain");
+            ("server", "httpun");
+            ("date", !memo_date);
+          ]
+      in
+      let rsp = Response.create ~headers `OK in
+      Reqd.respond_with_string reqd rsp payload
+  | _ ->
+      let moo = "m00." in
+      let headers =
+        Headers.of_list
+          [ ("content-length", string_of_int @@ String.length moo) ]
+      in
+      let rsp = Response.create ~headers `OK in
+      Reqd.respond_with_string reqd rsp moo
+
+let error_handler (_ : Eio.Net.Sockaddr.stream) ?request:_ error start_response
+    =
+  let response_body = start_response Headers.empty in
+  (match error with
+  | `Exn exn ->
+      Body.Writer.write_string response_body (Printexc.to_string exn);
+      Body.Writer.write_string response_body "\n"
+  | #Status.standard as error ->
+      Body.Writer.write_string response_body
+        (Status.default_reason_phrase error));
+  Body.Writer.close response_body
+
+let () =
+  let domain_count = Stdlib.Domain.recommended_domain_count () in
+  Printf.eprintf "Detected %d cores\n" domain_count;
+  let ulimit_n =
+    Unix.open_process_in "ulimit -n" |> input_line |> int_of_string
+  in
+  Printf.eprintf "Detected %d max open files\n" ulimit_n;
+  let somaxconn =
+    Stdlib.open_in "/proc/sys/net/core/somaxconn"
+    |> Stdlib.input_line |> Stdlib.int_of_string
+  in
+  Printf.eprintf "Detected %d somaxconn\n" somaxconn;
+  refresh_date ();
+  let backlog = Stdlib.min ulimit_n somaxconn in
+
+  Eio_main.run @@ fun env ->
+  Switch.run @@ fun sw ->
+  (* https://github.com/ocaml-multicore/eio/tree/main?tab=readme-ov-file#executor-pool *)
+  let dm = Eio.Stdenv.domain_mgr env in
+
+  let addr = `Tcp (Eio.Net.Ipaddr.V4.any, 8080) in
+  let listening_socket =
+    Eio.Net.listen ~sw env#net addr ~backlog ~reuse_addr:true
+  in
+
+  let connection_handler flow addr =
+    Server.create_connection_handler ~request_handler ~error_handler ~sw addr
+      flow
+  in
+  let run listening_socket =
+    Eio.Net.run_server ~additional_domains:(dm, domain_count) listening_socket
+      ~max_connections:backlog connection_handler
+      ~on_error:(traceln "Error handling connection: %a" Fmt.exn)
+  in
+  run listening_socket