Merge a56dd0ec65 into 6203e7a4a7

close #92

CHANGES.md

@@ -1,4 +1,23 @@
 
+## 0.19
+
+- feat(headers): `set` will not reallocate whole list if not needed
+- feat(headers): use case insensitive comparison
+- fix(response): do not override "content-length" in raw response
+- feat pool: expose `acquire/release` for advanced uses
+
+## 0.18
+
+- feat: add ?head_middlewares to `create`
+- add content-type header for prometheus endpoint
+- new flag ?enable_logging to disable regular logs (not debug)
+- new sublibrary to deal with multipart-form-data
+- feat response: add `pp_with`; have `pp` hide set-cookie headers
+
+- fix percent encoding for < 0x10 chars
+- Processing to fix incompatible -O and gcc flags
+- fix: make check for 'Connection: Upgrade' header case-insensitive
+
 ## 0.17
 
 - add optional middlewares to tiny_httpd_ws

dune-project

@@ -1,10 +1,10 @@
-(lang dune 2.9)
+(lang dune 3.2)
 (name tiny_httpd)
 (generate_opam_files true)
 
 (authors c-cube)
 (maintainers c-cube)
-(version 0.17)
+(version 0.19)
 (source (github c-cube/tiny_httpd))
 (homepage https://github.com/c-cube/tiny_httpd/)
 (license MIT)
@@ -39,3 +39,14 @@
     (iostream-camlzip (>= 0.2.1))
     (logs :with-test)
     (odoc :with-doc)))
+
+(package
+  (name tiny_httpd_moonpool)
+  (synopsis "Moonpool+picos_stdio backend for Tiny_httpd")
+  (depends
+    seq
+    (tiny_httpd (= :version))
+    (moonpool (>= 0.7))
+    (moonpool-io (>= 0.7))
+    (ocaml (>= 5.0))
+    (odoc :with-doc)))

echo_mio.sh

@@ -0,0 +1,2 @@
+#!/bin/sh
+exec dune exec --display=quiet --profile=release "examples/echo_mio.exe" -- $@

examples/dune

@@ -14,6 +14,12 @@
  (modules echo vfs)
  (libraries tiny_httpd logs tiny_httpd_camlzip tiny_httpd.multipart-form-data))
 
+(executable
+ (name echo_mio)
+ (flags :standard -warn-error -a+8)
+ (modules echo_mio)
+ (libraries tiny_httpd tiny_httpd_moonpool logs))
+
 (executable
  (name writer)
  (flags :standard -warn-error -a+8)

examples/echo.ml

@@ -134,6 +134,7 @@ let setup_upload server : unit =
 let () =
   let port_ = ref 8080 in
   let j = ref 32 in
+  let addr = ref "127.0.0.1" in
   Arg.parse
     (Arg.align
        [
@@ -141,11 +142,12 @@ let () =
          "-p", Arg.Set_int port_, " set port";
          "--debug", Arg.Unit setup_logging, " enable debug";
          "-j", Arg.Set_int j, " maximum number of connections";
+        "--addr", Arg.Set_string addr, " binding address";
        ])
     (fun _ -> raise (Arg.Bad ""))
     "echo [option]*";
 
-  let server = Tiny_httpd.create ~port:!port_ ~max_connections:!j () in
+  let server = Tiny_httpd.create ~addr:!addr ~port:!port_ ~max_connections:!j () in
 
   Tiny_httpd_camlzip.setup ~compress_above:1024 ~buf_size:(16 * 1024) server;
   let m_stats, get_stats = middleware_stat () in

examples/echo_mio.ml

@@ -0,0 +1,294 @@
+open Tiny_httpd_core
+module Log = Tiny_httpd.Log
+
+let now_ = Unix.gettimeofday
+
+let alice_text =
+  "CHAPTER I. Down the Rabbit-Hole  Alice was beginning to get very tired of \
+   sitting by her sister on the bank, and of having nothing to do: once or \
+   twice she had peeped into the book her sister was reading, but it had no \
+   pictures or conversations in it, <and what is the use of a book,> thought \
+   Alice <without pictures or conversations?> So she was considering in her \
+   own mind (as well as she could, for the hot day made her feel very sleepy \
+   and stupid), whether the pleasure of making a daisy-chain would be worth \
+   the trouble of getting up and picking the daisies, when suddenly a White \
+   Rabbit with pink eyes ran close by her. There was nothing so very \
+   remarkable in that; nor did Alice think it so very much out of the way to \
+   hear the Rabbit say to itself, <Oh dear! Oh dear! I shall be late!> (when \
+   she thought it over afterwards, it occurred to her that she ought to have \
+   wondered at this, but at the time it all seemed quite natural); but when \
+   the Rabbit actually took a watch out of its waistcoat-pocket, and looked at \
+   it, and then hurried on, Alice started to her feet, for it flashed across \
+   her mind that she had never before seen a rabbit with either a \
+   waistcoat-pocket, or a watch to take out of it, and burning with curiosity, \
+   she ran across the field after it, and fortunately was just in time to see \
+   it pop down a large rabbit-hole under the hedge. In another moment down \
+   went Alice after it, never once considering how in the world she was to get \
+   out again. The rabbit-hole went straight on like a tunnel for some way, and \
+   then dipped suddenly down, so suddenly that Alice had not a moment to think \
+   about stopping herself before she found herself falling down a very deep \
+   well. Either the well was very deep, or she fell very slowly, for she had \
+   plenty of time as she went down to look about her and to wonder what was \
+   going to happen next. First, she tried to look down and make out what she \
+   was coming to, but it was too dark to see anything; then she looked at the \
+   sides of the well, and noticed that they were filled with cupboards......"
+
+(* util: a little middleware collecting statistics *)
+let middleware_stat () : Server.Middleware.t * (unit -> string) =
+  let n_req = ref 0 in
+  let total_time_ = ref 0. in
+  let parse_time_ = ref 0. in
+  let build_time_ = ref 0. in
+  let write_time_ = ref 0. in
+
+  let m h req ~resp =
+    incr n_req;
+    let t1 = Request.start_time req in
+    let t2 = now_ () in
+    h req ~resp:(fun response ->
+        let t3 = now_ () in
+        resp response;
+        let t4 = now_ () in
+        total_time_ := !total_time_ +. (t4 -. t1);
+        parse_time_ := !parse_time_ +. (t2 -. t1);
+        build_time_ := !build_time_ +. (t3 -. t2);
+        write_time_ := !write_time_ +. (t4 -. t3))
+  and get_stat () =
+    Printf.sprintf
+      "%d requests (average response time: %.3fms = %.3fms + %.3fms + %.3fms)"
+      !n_req
+      (!total_time_ /. float !n_req *. 1e3)
+      (!parse_time_ /. float !n_req *. 1e3)
+      (!build_time_ /. float !n_req *. 1e3)
+      (!write_time_ /. float !n_req *. 1e3)
+  in
+  m, get_stat
+
+(* ugly AF *)
+let base64 x =
+  let ic, oc = Unix.open_process "base64" in
+  output_string oc x;
+  flush oc;
+  close_out oc;
+  let r = input_line ic in
+  ignore (Unix.close_process (ic, oc));
+  r
+
+let setup_logging () =
+  Logs.set_reporter @@ Logs.format_reporter ();
+  Logs.set_level ~all:true (Some Logs.Debug)
+
+let () =
+  Moonpool_fib.main @@ fun _ ->
+  let port_ = ref 8080 in
+  let max_conn = ref 800 in
+  let j = ref 16 in
+  Arg.parse
+    (Arg.align
+       [
+         "--port", Arg.Set_int port_, " set port";
+         "-p", Arg.Set_int port_, " set port";
+         "--debug", Arg.Unit setup_logging, " enable debug";
+         ( "--max-connections",
+           Arg.Set_int max_conn,
+           " maximum number of connections" );
+         "-j", Arg.Set_int j, " Size of thread pool";
+       ])
+    (fun _ -> raise (Arg.Bad ""))
+    "echo [option]*";
+
+  let runner = Moonpool.Ws_pool.create ~num_threads:!j () in
+  let server : Server.t =
+    Tiny_httpd_moonpool.create ~runner ~port:!port_ ~max_connections:!max_conn
+      ()
+  in
+
+  let m_stats, get_stats = middleware_stat () in
+  Server.add_middleware server ~stage:(`Stage 1) m_stats;
+
+  (* say hello *)
+  Server.add_route_handler ~meth:`GET server
+    Route.(exact "hello" @/ string @/ return)
+    (fun name _req -> Response.make_string (Ok ("hello " ^ name ^ "!\n")));
+
+  (* compressed file access *)
+  Server.add_route_handler ~meth:`GET server
+    Route.(exact "zcat" @/ string_urlencoded @/ return)
+    (fun path _req ->
+      let ic = open_in path in
+      let str = IO.Input.of_in_channel ic in
+      let mime_type =
+        try
+          let p = Unix.open_process_in (Printf.sprintf "file -i -b %S" path) in
+          try
+            let s = [ "Content-Type", String.trim (input_line p) ] in
+            ignore @@ Unix.close_process_in p;
+            s
+          with _ ->
+            ignore @@ Unix.close_process_in p;
+            []
+        with _ -> []
+      in
+      Response.make_stream ~headers:mime_type (Ok str));
+
+  (* echo request *)
+  Server.add_route_handler server
+    Route.(exact "echo" @/ return)
+    (fun req ->
+      let q =
+        Request.query req
+        |> List.map (fun (k, v) -> Printf.sprintf "%S = %S" k v)
+        |> String.concat ";"
+      in
+      Response.make_string
+        (Ok (Format.asprintf "echo:@ %a@ (query: %s)@." Request.pp req q)));
+
+  (* file upload *)
+  Server.add_route_handler_stream ~meth:`PUT server
+    Route.(exact "upload" @/ string @/ return)
+    (fun path req ->
+      Log.debug (fun k ->
+          k "start upload %S, headers:\n%s\n\n%!" path
+            (Format.asprintf "%a" Headers.pp (Request.headers req)));
+      try
+        let oc = open_out @@ "/tmp/" ^ path in
+        IO.Input.to_chan oc req.Request.body;
+        flush oc;
+        Response.make_string (Ok "uploaded file")
+      with e ->
+        Response.fail ~code:500 "couldn't upload file: %s"
+          (Printexc.to_string e));
+
+  (* protected by login *)
+  Server.add_route_handler server
+    Route.(exact "protected" @/ return)
+    (fun req ->
+      let ok =
+        match Request.get_header req "authorization" with
+        | Some v ->
+          Log.debug (fun k -> k "authenticate with %S" v);
+          v = "Basic " ^ base64 "user:foobar"
+        | None -> false
+      in
+      if ok then (
+        (* FIXME: a logout link *)
+        let s =
+          "<p>hello, this is super secret!</p><a href=\"/logout\">log out</a>"
+        in
+        Response.make_string (Ok s)
+      ) else (
+        let headers =
+          Headers.(empty |> set "www-authenticate" "basic realm=\"echo\"")
+        in
+        Response.fail ~code:401 ~headers "invalid"
+      ));
+
+  (* logout *)
+  Server.add_route_handler server
+    Route.(exact "logout" @/ return)
+    (fun _req -> Response.fail ~code:401 "logged out");
+
+  (* stats *)
+  Server.add_route_handler server
+    Route.(exact "stats" @/ return)
+    (fun _req ->
+      let stats = get_stats () in
+      Response.make_string @@ Ok stats);
+
+  Server.add_route_handler server
+    Route.(exact "alice" @/ return)
+    (fun _req -> Response.make_string (Ok alice_text));
+
+  Server.add_route_handler server
+    Route.(exact "alice10" @/ return)
+    (fun _req ->
+      let writer =
+        IO.Writer.make () ~write:(fun oc ->
+            for _i = 1 to 10 do
+              IO.Output.output_string oc alice_text;
+              IO.Output.flush oc
+            done)
+      in
+      Response.make_writer (Ok writer));
+
+  (* main page *)
+  Server.add_route_handler server
+    Route.(return)
+    (fun _req ->
+      let open Tiny_httpd_html in
+      let h =
+        html []
+          [
+            head [] [ title [] [ txt "index of echo" ] ];
+            body []
+              [
+                h3 [] [ txt "welcome!" ];
+                p [] [ b [] [ txt "endpoints are:" ] ];
+                ul []
+                  [
+                    li [] [ pre [] [ txt "/hello/:name (GET)" ] ];
+                    li []
+                      [
+                        pre []
+                          [
+                            a [ A.href "/echo/" ] [ txt "echo" ];
+                            txt " echo back query";
+                          ];
+                      ];
+                    li []
+                      [ pre [] [ txt "/upload/:path (PUT) to upload a file" ] ];
+                    li []
+                      [
+                        pre []
+                          [
+                            txt
+                              "/zcat/:path (GET) to download a file (deflate \
+                               transfer-encoding)";
+                          ];
+                      ];
+                    li []
+                      [
+                        pre []
+                          [
+                            a [ A.href "/stats/" ] [ txt "/stats/" ];
+                            txt " (GET) to access statistics";
+                          ];
+                      ];
+                    li []
+                      [
+                        pre []
+                          [
+                            a [ A.href "/vfs/" ] [ txt "/vfs" ];
+                            txt " (GET) to access a VFS embedded in the binary";
+                          ];
+                      ];
+                    li []
+                      [
+                        pre []
+                          [
+                            a [ A.href "/protected" ] [ txt "/protected" ];
+                            txt
+                              " (GET) to see a protected page (login: user, \
+                               password: foobar)";
+                          ];
+                      ];
+                    li []
+                      [
+                        pre []
+                          [
+                            a [ A.href "/logout" ] [ txt "/logout" ];
+                            txt " (POST) to log out";
+                          ];
+                      ];
+                  ];
+              ];
+          ]
+      in
+      let s = to_string_top h in
+      Response.make_string ~headers:[ "content-type", "text/html" ] @@ Ok s);
+
+  Printf.printf "listening on http://%s:%d\n%!" (Server.addr server)
+    (Server.port server);
+  match Server.run server with
+  | Ok () -> ()
+  | Error e -> raise e

src/Tiny_httpd.ml

@@ -30,7 +30,8 @@ end
 let create ?enable_logging ?(masksigpipe = not Sys.win32) ?max_connections
     ?(timeout = 0.0) ?buf_size ?(get_time_s = Unix.gettimeofday)
     ?(new_thread = fun f -> ignore (Thread.create f () : Thread.t))
-    ?(addr = "127.0.0.1") ?(port = 8080) ?sock ?middlewares () : t =
+    ?(addr = "127.0.0.1") ?(port = 8080) ?sock ?head_middlewares ?middlewares ()
+    : t =
   let max_connections = get_max_connection_ ?max_connections () in
   let server =
     {
@@ -65,4 +66,5 @@ let create ?enable_logging ?(masksigpipe = not Sys.win32) ?max_connections
     let tcp_server () = tcp_server_builder
   end in
   let backend = (module B : IO_BACKEND) in
-  Server.create_from ?enable_logging ?buf_size ?middlewares ~backend ()
+  Server.create_from ?enable_logging ?buf_size ?head_middlewares ?middlewares
+    ~backend ()

src/Tiny_httpd.mli

@@ -135,6 +135,7 @@ val create :
   ?addr:string ->
   ?port:int ->
   ?sock:Unix.file_descr ->
+  ?head_middlewares:Head_middleware.t list ->
   ?middlewares:([ `Encoding | `Stage of int ] * Middleware.t) list ->
   unit ->
   t
@@ -169,7 +170,7 @@ val create :
       used instead of the [addr] and [port]. If not passed in, those will be
       used. This parameter exists since 0.10.
     @param enable_logging if true and [Logs] is installed, log requests. Default true.
-      This parameter exists since NEXT_RELEASE. Does not affect debug-level logs.
+      This parameter exists since 0.18. Does not affect debug-level logs.
 
     @param get_time_s obtain the current timestamp in seconds.
       This parameter exists since 0.11.

src/bin/http_of_dir.ml

@@ -1,7 +1,5 @@
 module S = Tiny_httpd
-module U = Tiny_httpd.Util
 module D = Tiny_httpd.Dir
-module Pf = Printf
 module Log = Tiny_httpd.Log
 
 let serve ~config ~timeout (dir : string) addr port j : _ result =
@@ -9,9 +7,9 @@ let serve ~config ~timeout (dir : string) addr port j : _ result =
   let after_init () =
     Printf.printf "serve directory %s on http://%(%s%):%d\n%!" dir
       (if S.is_ipv6 server then
-        "[%s]"
+         "[%s]"
-      else
+       else
-        "%s")
+         "%s")
       addr (S.port server)
   in
 
@@ -63,9 +61,9 @@ let main () =
              (fun b ->
                config.dir_behavior <-
                  (if b then
-                   Index_or_lists
+                    Index_or_lists
-                 else
+                  else
-                   Lists)),
+                    Lists)),
            " <bool> automatically redirect to index.html if present" );
          ( "--delete",
            Unit (fun () -> config.delete <- true),

src/core/headers.ml

@@ -4,24 +4,46 @@ type t = (string * string) list
 
 let empty = []
 
-let contains name headers =
+(* [Char.lowercase_ascii] but easier to inline *)
-  let name' = String.lowercase_ascii name in
+let[@inline] lower_char_ = function
-  List.exists (fun (n, _) -> name' = n) headers
+  | 'A' .. 'Z' as c -> Char.unsafe_chr (Char.code c + 32)
+  | c -> c
 
-let get_exn ?(f = fun x -> x) x h =
+(** Are these two header names equal? This is case insensitive *)
-  let x' = String.lowercase_ascii x in
+let equal_name_ (s1 : string) (s2 : string) : bool =
-  List.assoc x' h |> f
+  String.length s1 = String.length s2
+  &&
+  try
+    for i = 0 to String.length s1 - 1 do
+      let c1 = String.unsafe_get s1 i |> lower_char_ in
+      let c2 = String.unsafe_get s2 i |> lower_char_ in
+      if c1 <> c2 then raise_notrace Exit
+    done;
+    true
+  with Exit -> false
+
+let contains name headers =
+  List.exists (fun (n, _) -> equal_name_ name n) headers
+
+let rec get_exn ?(f = fun x -> x) x h =
+  match h with
+  | [] -> raise Not_found
+  | (k, v) :: _ when equal_name_ x k -> f v
+  | _ :: tl -> get_exn ~f x tl
 
 let get ?(f = fun x -> x) x h =
   try Some (get_exn ~f x h) with Not_found -> None
 
-let remove x h =
+let remove x h = List.filter (fun (k, _) -> not (equal_name_ k x)) h
-  let x' = String.lowercase_ascii x in
-  List.filter (fun (k, _) -> k <> x') h
 
 let set x y h =
-  let x' = String.lowercase_ascii x in
+  let h =
-  (x', y) :: List.filter (fun (k, _) -> k <> x') h
+    if contains x h then
+      remove x h
+    else
+      h
+  in
+  (x, y) :: h
 
 let pp out l =
   let pp_pair out (k, v) = Format.fprintf out "@[<h>%s: %s@]" k v in
@@ -76,6 +98,6 @@ let parse_ ~(buf : Buf.t) (bs : IO.Input.t) : t =
         | Error msg ->
           bad_reqf 400 "invalid header line: %s\nline is: %S" msg line
       in
-      loop ((String.lowercase_ascii k, v) :: acc)
+      loop ((k, v) :: acc)
   in
   loop []

src/core/headers.mli

@@ -32,8 +32,9 @@ val contains : string -> t -> bool
 val pp : Format.formatter -> t -> unit
 (** Pretty print the headers. *)
 
-val parse_ : buf:Buf.t -> IO.Input.t -> t
 (**/*)
 
+val parse_ : buf:Buf.t -> IO.Input.t -> t
 val parse_line_ : string -> (string * string, string) result
+
 (**/*)

src/core/log.mli

@@ -14,4 +14,4 @@ val dummy : bool
 val fully_disable : unit -> unit
 (** Totally silence logs for tiny_httpd. With [Logs] installed this means setting
     the level of the tiny_httpd source to [None]. 
-  @since NEXT_RELEASE *)
+  @since 0.18 *)

src/core/pool.ml

@@ -12,20 +12,20 @@ type 'a t = {
 let create ?(clear = ignore) ~mk_item ?(max_size = 512) () : _ t =
   { mk_item; clear; max_size; items = A.make Nil }
 
-let rec acquire_ self =
+let rec acquire self =
   match A.get self.items with
   | Nil -> self.mk_item ()
   | Cons (_, x, tl) as l ->
     if A.compare_and_set self.items l tl then
       x
     else
-      acquire_ self
+      acquire self
 
 let[@inline] size_ = function
   | Cons (sz, _, _) -> sz
   | Nil -> 0
 
-let release_ self x : unit =
+let release self x : unit =
   let rec loop () =
     match A.get self.items with
     | Cons (sz, _, _) when sz >= self.max_size ->
@@ -40,12 +40,17 @@ let release_ self x : unit =
   loop ()
 
 let with_resource (self : _ t) f =
-  let x = acquire_ self in
+  let x = acquire self in
   try
     let res = f x in
-    release_ self x;
+    release self x;
     res
   with e ->
     let bt = Printexc.get_raw_backtrace () in
-    release_ self x;
+    release self x;
     Printexc.raise_with_backtrace e bt
+
+module Raw = struct
+  let release = release
+  let acquire = acquire
+end

src/core/pool.mli

@@ -23,3 +23,12 @@ val with_resource : 'a t -> ('a -> 'b) -> 'b
 (** [with_resource pool f] runs [f x] with [x] a resource;
     when [f] fails or returns, [x] is returned to the pool for
     future reuse. *)
+
+(** Low level control over the pool.
+    This is easier to get wrong (e.g. releasing the same resource twice)
+    so use with caution.
+  @since 0.18 *)
+module Raw : sig
+  val acquire : 'a t -> 'a
+  val release : 'a t -> 'a -> unit
+end

src/core/response.ml

@@ -15,7 +15,11 @@ let set_code code self = { self with code }
 let make_raw ?(headers = []) ~code body : t =
   (* add content length to response *)
   let headers =
-    Headers.set "Content-Length" (string_of_int (String.length body)) headers
+    if Headers.contains "content-length" headers then
+      (* do not override user-provided headers (e.g. in HEAD), see #92 *)
+      headers
+    else
+      Headers.set "Content-Length" (string_of_int (String.length body)) headers
   in
   { code; headers; body = `String body }
 

src/core/response.mli

@@ -126,7 +126,7 @@ val pp_with :
       Default is ["set-cookie"].
     @param pp_body body printer
       (default fully prints String bodies, but omits stream bodies)
-    @since NEXT_RELEASE *)
+    @since 0.18 *)
 
 val pp : Format.formatter -> t -> unit
 (** Pretty print the response. The exact format is not specified. *)

src/core/response_code.ml

@@ -5,6 +5,7 @@ let not_found = 404
 
 let descr = function
   | 100 -> "Continue"
+  | 101 -> "Switching Protocols"
   | 200 -> "OK"
   | 201 -> "Created"
   | 202 -> "Accepted"

src/core/server.ml

@@ -88,6 +88,7 @@ type t = {
   mutable tcp_server: IO.TCP_server.t option;
   mutable handler: IO.Input.t Request.t -> Response.t;
       (** toplevel handler, if any *)
+  mutable head_middlewares: Head_middleware.t list;
   mutable middlewares: (int * Middleware.t) list;  (** Global middlewares *)
   mutable middlewares_sorted: (int * Middleware.t) list lazy_t;
       (** sorted version of {!middlewares} *)
@@ -128,6 +129,9 @@ let add_middleware ~stage self m =
   self.middlewares <- (stage, m) :: self.middlewares;
   self.middlewares_sorted <- lazy (sort_middlewares_ self.middlewares)
 
+let add_head_middleware (self : t) m : unit =
+  self.head_middlewares <- m :: self.head_middlewares
+
 let add_decode_request_cb self f =
   (* turn it into a middleware *)
   let m h req ~resp =
@@ -258,6 +262,7 @@ let add_route_server_sent_handler ?accept ?(middlewares = []) self route f =
 let add_upgrade_handler ?(accept = fun _ -> Ok ()) ?(middlewares = [])
     (self : t) route f : unit =
   let ph req : handler_result option =
+    let middlewares = List.rev_append self.head_middlewares middlewares in
     if req.Request.meth <> `GET then
       None
     else (
@@ -274,7 +279,7 @@ let add_upgrade_handler ?(accept = fun _ -> Ok ()) ?(middlewares = [])
 let clear_bytes_ bs = Bytes.fill bs 0 (Bytes.length bs) '\x00'
 
 let create_from ?(enable_logging = not Log.dummy) ?(buf_size = 16 * 1_024)
-    ?(middlewares = []) ~backend () : t =
+    ?(head_middlewares = []) ?(middlewares = []) ~backend () : t =
   let handler _req = Response.fail ~code:404 "no top handler" in
   let self =
     {
@@ -283,6 +288,7 @@ let create_from ?(enable_logging = not Log.dummy) ?(buf_size = 16 * 1_024)
       tcp_server = None;
       handler;
       path_handlers = [];
+      head_middlewares;
       middlewares = [];
       middlewares_sorted = lazy [];
       bytes_pool =

src/core/server.mli

@@ -83,6 +83,7 @@ end
 val create_from :
   ?enable_logging:bool ->
   ?buf_size:int ->
+  ?head_middlewares:Head_middleware.t list ->
   ?middlewares:([ `Encoding | `Stage of int ] * Middleware.t) list ->
   backend:(module IO_BACKEND) ->
   unit ->
@@ -94,9 +95,10 @@ val create_from :
     {!set_top_handler} to specify how to handle incoming requests.
 
     @param buf_size size for buffers (since 0.11)
+    @param head_middlewares see {!add_head_middleware} for details (since 0.18)
     @param middlewares see {!add_middleware} for more details.
     @param enable_logging if true and [Logs] is installed,
-      emit logs via Logs (since NEXT_RELEASE).
+      emit logs via Logs (since 0.18).
       Default [true].
 
     @since 0.14
@@ -152,6 +154,12 @@ val add_middleware :
     @since 0.11
 *)
 
+val add_head_middleware : t -> Head_middleware.t -> unit
+(** Add a request-header only {!Head_middleware.t}.
+    This is called on requests, to modify them, and returns a new request
+    immediately.
+    @since 0.18 *)
+
 (** {2 Request handlers} *)
 
 val set_top_handler : t -> (IO.Input.t Request.t -> Response.t) -> unit

src/moonpool-io/dune

@@ -0,0 +1,6 @@
+
+
+(library
+ (name tiny_httpd_moonpool)
+ (public_name tiny_httpd_moonpool)
+ (libraries tiny_httpd moonpool moonpool.sync moonpool.fib moonpool-io))

src/moonpool-io/io_server.ml

@@ -0,0 +1,220 @@
+open Tiny_httpd_core
+module A = Atomic
+module MIO = Moonpool_io
+module Sem = Moonpool_sync.Semaphore.Counting
+module Fd = Moonpool_io.Fd
+
+module IO_helper = struct
+  module Slice = Iostream.Slice
+
+  module Output = struct
+    include IO.Output
+
+    class of_unix_fd ?(close_noerr = false) ~closed ~(buf : Slice.t) (fd : Fd.t) :
+      t =
+      object
+        inherit t_from_output ~bytes:buf.bytes ()
+
+        method private output_underlying bs i len0 =
+          let i = ref i in
+          let len = ref len0 in
+          while !len > 0 do
+            match MIO.Unix.write fd bs !i !len with
+            | 0 -> failwith "write failed"
+            | n ->
+              i := !i + n;
+              len := !len - n
+          done
+
+        method private close_underlying () =
+          if not !closed then (
+            closed := true;
+            if close_noerr then (
+              try MIO.Unix.close fd with _ -> ()
+            ) else
+              MIO.Unix.close fd
+          )
+      end
+  end
+
+  module Input = struct
+    include IO.Input
+
+    let of_unix_fd ?(close_noerr = false) ~closed ~(buf : Slice.t) (fd : Fd.t) :
+        t =
+      let eof = ref false in
+      object
+        inherit Iostream.In_buf.t_from_refill ~bytes:buf.bytes ()
+
+        method private refill (slice : Slice.t) =
+          if not !eof then (
+            slice.off <- 0;
+            let continue = ref true in
+            while !continue do
+              match
+                MIO.Unix.read fd slice.bytes 0 (Bytes.length slice.bytes)
+              with
+              | n ->
+                slice.len <- n;
+                continue := false
+            done;
+            (* Printf.eprintf "read returned %d B\n%!" !n; *)
+            if slice.len = 0 then eof := true
+          )
+
+        method close () =
+          if not !closed then (
+            closed := true;
+            eof := true;
+            if close_noerr then (
+              try MIO.Unix.close fd with _ -> ()
+            ) else
+              MIO.Unix.close fd
+          )
+      end
+  end
+end
+
+open struct
+  let get_addr_ (fd : Fd.t) =
+    match Unix.getsockname (Fd.unsafe_get fd) with
+    | Unix.ADDR_INET (addr, port) -> addr, port
+    | _ -> invalid_arg "httpd: address is not INET"
+
+  let shutdown_silent_ (fd : Fd.t) : unit =
+    try MIO.Unix.shutdown fd Unix.SHUTDOWN_ALL with _ -> ()
+
+  let close_silent_ (fd : Fd.t) : unit = try MIO.Unix.close fd with _ -> ()
+end
+
+type t = {
+  addr: string;
+  port: int;
+  buf_pool: Buf.t Pool.t;
+  slice_pool: IO.Slice.t Pool.t;
+  max_connections: int;
+  sem_max_connections: Sem.t;
+      (** semaphore to restrict the number of active concurrent connections *)
+  mutable sock: Fd.t option;  (** Socket *)
+  new_thread: (unit -> unit) -> unit;
+  timeout: float;
+  running: bool A.t; (* TODO: use an atomic? *)
+}
+
+let to_tcp_server (self : t) : IO.TCP_server.builder =
+  {
+    IO.TCP_server.serve =
+      (fun ~after_init ~handle () : unit ->
+        let sock, should_bind =
+          match self.sock with
+          | Some s ->
+            (* Because we're getting a socket from the caller (e.g. systemd) *)
+            s, false
+          | None ->
+            let sock =
+              Unix.socket
+                (if Util.is_ipv6_str self.addr then
+                  Unix.PF_INET6
+                else
+                  Unix.PF_INET)
+                Unix.SOCK_STREAM 0
+            in
+            let fd = Fd.create sock in
+            fd, true (* Because we're creating the socket ourselves *)
+        in
+        MIO.Unix.set_nonblock sock;
+        MIO.Unix.setsockopt_optint sock Unix.SO_LINGER None;
+        if should_bind then (
+          let inet_addr = Unix.inet_addr_of_string self.addr in
+          MIO.Unix.setsockopt sock Unix.SO_REUSEADDR true;
+          MIO.Unix.bind sock (Unix.ADDR_INET (inet_addr, self.port));
+          let n_listen = 2 * self.max_connections in
+          MIO.Unix.listen sock n_listen
+        );
+
+        self.sock <- Some sock;
+
+        let tcp_server =
+          {
+            IO.TCP_server.stop = (fun () -> Atomic.set self.running false);
+            running = (fun () -> Atomic.get self.running);
+            active_connections =
+              (fun () ->
+                self.max_connections - Sem.get_value self.sem_max_connections);
+            endpoint =
+              (fun () ->
+                let addr, port = get_addr_ sock in
+                Unix.string_of_inet_addr addr, port);
+          }
+        in
+        after_init tcp_server;
+
+        (* how to handle a single client *)
+        let handle_client_ (client_sock : Fd.t) (client_addr : Unix.sockaddr) :
+            unit =
+          Log.debug (fun k ->
+              k "t[%d]: serving new client on %s"
+                (Thread.id @@ Thread.self ())
+                (Util.show_sockaddr client_addr));
+
+          MIO.Unix.set_nonblock client_sock;
+          MIO.Unix.setsockopt client_sock Unix.TCP_NODELAY true;
+          MIO.Unix.(setsockopt_float client_sock SO_RCVTIMEO self.timeout);
+          MIO.Unix.(setsockopt_float client_sock SO_SNDTIMEO self.timeout);
+
+          Pool.with_resource self.slice_pool @@ fun ic_buf ->
+          Pool.with_resource self.slice_pool @@ fun oc_buf ->
+          let closed = ref false in
+
+          let oc =
+            new IO_helper.Output.of_unix_fd
+              ~close_noerr:true ~closed ~buf:oc_buf client_sock
+          in
+          let ic =
+            IO_helper.Input.of_unix_fd ~close_noerr:true ~closed ~buf:ic_buf
+              client_sock
+          in
+          handle.handle ~client_addr ic oc
+        in
+
+        MIO.Unix.set_nonblock sock;
+        while Atomic.get self.running do
+          match MIO.Unix.accept sock with
+          | client_sock, client_addr ->
+            (* limit concurrency *)
+            Sem.acquire self.sem_max_connections;
+            self.new_thread (fun () ->
+                try
+                  handle_client_ client_sock client_addr;
+                  Log.debug (fun k ->
+                      k "t[%d]: done with client on %s, exiting"
+                        (Thread.id @@ Thread.self ())
+                      @@ Util.show_sockaddr client_addr);
+                  shutdown_silent_ client_sock;
+                  close_silent_ client_sock;
+                  Sem.release self.sem_max_connections
+                with e ->
+                  let bt = Printexc.get_raw_backtrace () in
+                  shutdown_silent_ client_sock;
+                  close_silent_ client_sock;
+                  Sem.release self.sem_max_connections;
+                  Log.error (fun k ->
+                      k
+                        "@[<v>Handler: uncaught exception for client %s:@ %s@ \
+                         %s@]"
+                        (Util.show_sockaddr client_addr)
+                        (Printexc.to_string e)
+                        (Printexc.raw_backtrace_to_string bt)))
+          | exception e ->
+            Log.error (fun k ->
+                k "Unix.accept raised an exception: %s" (Printexc.to_string e));
+            Atomic.set self.running false
+        done;
+
+        (* Wait for all threads to be done: this only works if all threads are done. *)
+        MIO.Unix.close sock;
+        while Sem.get_value self.sem_max_connections < self.max_connections do
+          Sem.acquire self.sem_max_connections
+        done;
+        ());
+  }

src/moonpool-io/tiny_httpd_moonpool.ml

@@ -0,0 +1,52 @@
+include Tiny_httpd
+module Fd = Io_server.Fd
+
+open struct
+  let get_max_connection_ ?(max_connections = 64) () : int =
+    let max_connections = max 4 max_connections in
+    max_connections
+
+  let clear_slice (slice : IO.Slice.t) =
+    Bytes.fill slice.bytes 0 (Bytes.length slice.bytes) '\x00';
+    slice.off <- 0;
+    slice.len <- 0
+end
+
+let create ?max_connections ?(timeout = 0.0) ?buf_size
+    ?(get_time_s = Unix.gettimeofday) ?(addr = "127.0.0.1") ?(port = 8080)
+    ?(sock : Fd.t option) ?middlewares ~(runner : Moonpool.Runner.t) () : t =
+  let new_thread f =
+    ignore (Moonpool_fib.spawn_top ~on:runner f : _ Moonpool_fib.t)
+  in
+  let max_connections = get_max_connection_ ?max_connections () in
+  let server =
+    {
+      Io_server.addr;
+      new_thread;
+      buf_pool =
+        Pool.create ~clear:Buf.clear_and_zero
+          ~mk_item:(fun () -> Buf.create ?size:buf_size ())
+          ();
+      slice_pool =
+        Pool.create ~clear:clear_slice
+          ~mk_item:
+            (let buf_size = Option.value buf_size ~default:4096 in
+             fun () -> IO.Slice.create buf_size)
+          ();
+      running = Atomic.make true;
+      port;
+      sock;
+      max_connections;
+      sem_max_connections = Io_server.Sem.make max_connections;
+      timeout;
+    }
+  in
+  let tcp_server_builder = Io_server.to_tcp_server server in
+  let module B = struct
+    let init_addr () = addr
+    let init_port () = port
+    let get_time_s = get_time_s
+    let tcp_server () = tcp_server_builder
+  end in
+  let backend = (module B : IO_BACKEND) in
+  Server.create_from ?buf_size ?middlewares ~backend ()

src/prometheus/tiny_httpd_prometheus.mli

@@ -72,11 +72,6 @@ module Histogram : sig
   val add : t -> float -> unit
 end
 
-(* TODO:
-   module Histogram : sig
-   end
-*)
-
 val http_middleware : Registry.t -> Server.Middleware.t
 (** Middleware to get basic metrics about HTTP requests *)
 

src/ws/dune

@@ -1,3 +1,28 @@
+; Set BUILD_TINY_HTTPD_OPTLEVEL to the -O<num> level.
+; Defaults to 2, which means -O2 is the default C optimization flag.
+; Use -1 to remove the -O<num> flag entirely.
+(rule
+ (enabled_if (>= %{env:BUILD_TINY_HTTPD_OPTLEVEL=2} 0))
+ (target optlevel.string)
+ (deps (env_var BUILD_TINY_HTTPD_OPTLEVEL))
+ (action (with-stdout-to %{target} (echo "-O%{env:BUILD_TINY_HTTPD_OPTLEVEL=2}"))))
+(rule
+ (enabled_if (< %{env:BUILD_TINY_HTTPD_OPTLEVEL=2} 0))
+ (target optlevel.string)
+ (deps (env_var BUILD_TINY_HTTPD_OPTLEVEL))
+ (action (with-stdout-to %{target} (echo ""))))
+
+; All compilers will include the optimization level.
+; Non-MSVC compilers will include `-std=c99 -fPIC`.
+(rule
+ (enabled_if (= %{ocaml-config:ccomp_type} msvc))
+ (target cflags.sexp)
+ (action (with-stdout-to %{target} (echo "(%{read:optlevel.string})"))))
+(rule
+ (enabled_if (not (= %{ocaml-config:ccomp_type} msvc)))
+ (target cflags.sexp)
+ (action (with-stdout-to %{target} (echo "(-std=c99 -fPIC %{read:optlevel.string})"))))
+
 (library
  (name tiny_httpd_ws)
  (public_name tiny_httpd.ws)
@@ -7,7 +32,7 @@
  (foreign_stubs
   (language c)
   (names tiny_httpd_ws_stubs)
-  (flags :standard -std=c99 -fPIC -O2))
+  (flags :standard (:include cflags.sexp)))
  (libraries
   (re_export tiny_httpd.core)
   threads))

tests/dune

@@ -19,6 +19,27 @@
  (action
   (diff echo1.expect echo1.out)))
 
+(rule
+ (targets echo_mio1.out)
+ (deps
+  (:bin ../examples/echo_mio.exe))
+ (locks /port)
+ (enabled_if
+  (= %{system} "linux"))
+ (package tiny_httpd_moonpool)
+ (action
+  (with-stdout-to
+   %{targets}
+   (run ./echo_mio1.sh %{bin}))))
+
+(rule
+ (alias runtest)
+ (package tiny_httpd_moonpool)
+ (enabled_if
+  (= %{system} "linux"))
+ (action
+  (diff echo_mio1.expect echo_mio1.out)))
+
 (rule
  (targets sse_count.out)
  (deps

tests/echo1.expect

@@ -2,8 +2,8 @@ listening on http://127.0.0.1:8085
 echo:
 {meth=GET; host=localhost:8085;
  headers=[user-agent: test
-          accept: */*
+          Accept: */*
-          host: localhost:8085];
+          Host: localhost:8085];
  path="/echo/?a=b&c=d"; body=""; path_components=["echo"];
  query=["c","d";"a","b"]}
 (query: "c" = "d";"a" = "b")

tests/echo_mio1.expect

@@ -0,0 +1,10 @@
+listening on http://127.0.0.1:8085
+test moonpool_io
+echo:
+{meth=GET; host=localhost:8085;
+ headers=[user-agent: test
+          accept: */*
+          host: localhost:8085];
+ path="/echo/?a=b&c=d"; body=""; path_components=["echo"];
+ query=["c","d";"a","b"]}
+(query: "c" = "d";"a" = "b")

tests/echo_mio1.sh

@@ -0,0 +1,12 @@
+#!/usr/bin/env sh
+
+ECHO=$1
+PORT=8085
+
+"$ECHO" -p $PORT &
+PID=$!
+sleep 0.1
+echo "test moonpool_io"
+curl -N "http://localhost:${PORT}/echo/?a=b&c=d" -H user-agent:test --max-time 5
+
+kill $PID

tests/unit/dune

@@ -1,4 +1,4 @@
 (tests
- (names t_util t_buf t_server t_io)
+ (names t_util t_buf t_server t_io t_response)
  (package tiny_httpd)
  (libraries tiny_httpd.core qcheck-core qcheck-core.runner test_util))

tests/unit/t_response.ml

@@ -0,0 +1,17 @@
+open Test_util
+open Tiny_httpd_core
+module U = Util
+
+let () =
+  let res =
+    Response.make_raw ~code:200 ~headers:[ "content-length", "42" ] ""
+  in
+  let h = Headers.get_exn "content-length" res.headers in
+  assert_eq "42" h
+
+let () =
+  let res =
+    Response.make_raw ~code:200 ~headers:[ "Content-Length", "42" ] ""
+  in
+  let h = Headers.get_exn "content-length" res.headers in
+  assert_eq "42" h

tests/upload_chunked.sh

@@ -5,7 +5,7 @@ if [ -f data ]; then rm data ; fi
 SERVER=$1
 PORT=8087
 
-"$SERVER" . -p $PORT --upload --max-upload 100000000000 &
+"$SERVER" . -p $PORT --upload --max-upload 1000M &
 PID=$!
 
 sleep 0.1

tiny_httpd.opam

@@ -1,6 +1,6 @@
 # This file is generated by dune, edit dune-project instead
 opam-version: "2.0"
-version: "0.17"
+version: "0.19"
 synopsis: "Minimal HTTP server using threads"
 maintainer: ["c-cube"]
 authors: ["c-cube"]
@@ -11,7 +11,7 @@ tags: [
 homepage: "https://github.com/c-cube/tiny_httpd/"
 bug-reports: "https://github.com/c-cube/tiny_httpd/issues"
 depends: [
-  "dune" {>= "2.9"}
+  "dune" {>= "3.2"}
   "seq"
   "base-threads"
   "result"
@@ -38,11 +38,9 @@ build: [
     name
     "-j"
     jobs
-    "--promote-install-files=false"
     "@install"
     "@runtest" {with-test}
     "@doc" {with-doc}
   ]
-  ["dune" "install" "-p" name "--create-install-files" name]
 ]
 dev-repo: "git+https://github.com/c-cube/tiny_httpd.git"

tiny_httpd_camlzip.opam

@@ -1,6 +1,6 @@
 # This file is generated by dune, edit dune-project instead
 opam-version: "2.0"
-version: "0.17"
+version: "0.19"
 synopsis: "Interface to camlzip for tiny_httpd"
 maintainer: ["c-cube"]
 authors: ["c-cube"]
@@ -8,7 +8,7 @@ license: "MIT"
 homepage: "https://github.com/c-cube/tiny_httpd/"
 bug-reports: "https://github.com/c-cube/tiny_httpd/issues"
 depends: [
-  "dune" {>= "2.9"}
+  "dune" {>= "3.2"}
   "tiny_httpd" {= version}
   "camlzip" {>= "1.06"}
   "iostream-camlzip" {>= "0.2.1"}
@@ -24,11 +24,9 @@ build: [
     name
     "-j"
     jobs
-    "--promote-install-files=false"
     "@install"
     "@runtest" {with-test}
     "@doc" {with-doc}
   ]
-  ["dune" "install" "-p" name "--create-install-files" name]
 ]
 dev-repo: "git+https://github.com/c-cube/tiny_httpd.git"

tiny_httpd_moonpool.opam

@@ -0,0 +1,35 @@
+# This file is generated by dune, edit dune-project instead
+opam-version: "2.0"
+version: "0.17"
+synopsis: "Moonpool+picos_stdio backend for Tiny_httpd"
+maintainer: ["c-cube"]
+authors: ["c-cube"]
+license: "MIT"
+homepage: "https://github.com/c-cube/tiny_httpd/"
+bug-reports: "https://github.com/c-cube/tiny_httpd/issues"
+depends: [
+  "dune" {>= "2.9"}
+  "seq"
+  "tiny_httpd" {= version}
+  "moonpool" {>= "0.7"}
+  "moonpool-io" {>= "0.7"}
+  "ocaml" {>= "5.0"}
+  "odoc" {with-doc}
+]
+build: [
+  ["dune" "subst"] {dev}
+  [
+    "dune"
+    "build"
+    "-p"
+    name
+    "-j"
+    jobs
+    "--promote-install-files=false"
+    "@install"
+    "@runtest" {with-test}
+    "@doc" {with-doc}
+  ]
+  ["dune" "install" "-p" name "--create-install-files" name]
+]
+dev-repo: "git+https://github.com/c-cube/tiny_httpd.git"