example with eio

echo_eio.sh

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

examples/dune

@@ -11,10 +11,27 @@
 (executable
  (name echo)
  (flags :standard -warn-error -a+8)
- (modules echo vfs)
+ (modules echo)
  (libraries
   tiny_httpd
   logs
+  echo_vfs
+  tiny_httpd_camlzip
+  tiny_httpd.multipart-form-data))
+
+(executable
+ (name echo_eio)
+ (flags :standard -warn-error -a+8)
+ (modules echo_eio)
+ (libraries
+  tiny_httpd
+  tiny_httpd_eio
+  eio
+  eio_main
+  logs
+  echo_vfs
+  trace.core
+  trace-tef
   tiny_httpd_camlzip
   tiny_httpd.multipart-form-data))
 
@@ -55,6 +72,12 @@
 
 ; produce an embedded FS
 
+(library
+  (name echo_vfs)
+  (modules vfs)
+  (wrapped false)
+  (libraries tiny_httpd))
+
 (rule
  (targets vfs.ml)
  (deps

examples/echo_eio.ml

@@ -0,0 +1,412 @@
+open Tiny_httpd_core
+module Trace = Trace_core
+module Log = Tiny_httpd.Log
+module MFD = Tiny_httpd_multipart_form_data
+
+let ( let@ ) = ( @@ )
+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
+
+let middleware_trace : Server.Middleware.t =
+ fun (h : Server.Middleware.handler) req ~resp ->
+  let _sp =
+    Trace.enter_manual_toplevel_span ~__FILE__ ~__LINE__ "http.handle"
+  in
+  let new_resp (r : Response.t) =
+    Trace.add_data_to_manual_span _sp [ "http.code", `Int r.code ];
+    Trace.exit_manual_span _sp;
+    resp r
+  in
+  h req ~resp:new_resp
+
+(* 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 setup_upload server : unit =
+  Server.add_route_handler_stream ~meth:`POST server
+    Route.(exact "upload" @/ return)
+    (fun req ->
+      let (`boundary boundary) =
+        match MFD.parse_content_type req.headers with
+        | Some b -> b
+        | None -> Response.fail_raise ~code:400 "no boundary found"
+      in
+
+      let st = MFD.create ~boundary req.body in
+      let tbl = Hashtbl.create 16 in
+      let cur = ref "" in
+      let cur_kind = ref "" in
+      let buf = Buffer.create 16 in
+      let rec loop () =
+        match MFD.next st with
+        | End_of_input ->
+          if !cur <> "" then
+            Hashtbl.add tbl !cur (!cur_kind, Buffer.contents buf)
+        | Part headers ->
+          if !cur <> "" then
+            Hashtbl.add tbl !cur (!cur_kind, Buffer.contents buf);
+          (match MFD.Content_disposition.parse headers with
+          | Some { kind; name = Some name; filename = _ } ->
+            cur := name;
+            cur_kind := kind;
+            Buffer.clear buf;
+            loop ()
+          | _ -> Response.fail_raise ~code:400 "content disposition missing")
+        | Read sl ->
+          Buffer.add_subbytes buf sl.bytes sl.off sl.len;
+          loop ()
+      in
+      loop ();
+
+      let open Tiny_httpd_html in
+      let data =
+        Hashtbl.fold
+          (fun name (kind, data) acc ->
+            Printf.sprintf "%S (kind: %S): %S" name kind data :: acc)
+          tbl []
+      in
+      let html =
+        body []
+          [
+            pre []
+              [ txt (Printf.sprintf "{\n%s\n}" @@ String.concat "\n" data) ];
+          ]
+      in
+      Response.make_string ~code:201 @@ Ok (to_string_top html))
+
+let () =
+  let@ () = Trace_tef.with_setup () in
+  let port_ = ref 8080 in
+  let max_conns = ref 16_000 in
+  let pool_buf_size = ref None in
+  let buf_size = ref 4096 in
+  let unix_sock = ref "" in
+  let addr = ref "127.0.0.1" in
+  Arg.parse
+    (Arg.align
+       [
+         "--port", Arg.Set_int port_, " set port";
+         "-p", Arg.Set_int port_, " set port";
+         "--unix", Arg.Set_string unix_sock, " set unix socket";
+         "--debug", Arg.Unit setup_logging, " enable debug";
+         ( "--max-buf-pool-size",
+           Arg.Int (fun i -> pool_buf_size := Some i),
+           " maximum buffer pool size" );
+         "--buf-size", Arg.Set_int buf_size, " buffer size";
+         "--max-conns", Arg.Set_int max_conns, " maximum number of connections";
+         "--addr", Arg.Set_string addr, " binding address";
+       ])
+    (fun _ -> raise (Arg.Bad ""))
+    "echo [option]*";
+
+  let@ stdenv = Eio_main.run in
+  let@ sw = Eio.Switch.run ~name:"main" in
+  let server =
+    Tiny_httpd_eio.create ~addr:!addr ~port:!port_ ~max_connections:!max_conns
+      ~buf_size:!buf_size ?max_buf_pool_size:!pool_buf_size ~stdenv ~sw ()
+  in
+
+  if Trace.enabled () then (
+    Tiny_httpd.Server.add_middleware server ~stage:(`Stage 1) middleware_trace;
+
+    (* fiber that emits metrics *)
+    Eio.Fiber.fork_daemon ~sw (fun () ->
+        while Eio.Switch.get_error sw |> Option.is_none do
+          Trace.counter_int "http.active-conns"
+            (Server.active_connections server);
+          Eio_unix.sleep 0.5
+        done;
+        `Stop_daemon)
+  );
+
+  Tiny_httpd_camlzip.setup ~compress_above:1024 ~buf_size:(16 * 1024) server;
+  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 ~meth:`HEAD server
+    Route.(exact "head" @/ return)
+    (fun _req ->
+      Response.make_void ~code:200 ~headers:[ "x-hello", "world" ] ());
+
+  (* VFS *)
+  Tiny_httpd.Dir.add_vfs server
+    ~config:
+      (Tiny_httpd.Dir.config ~download:true
+         ~dir_behavior:Tiny_httpd.Dir.Index_or_lists ())
+    ~vfs:Vfs.vfs ~prefix:"vfs";
+
+  setup_upload server;
+
+  (* 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";
+                          ];
+                      ];
+                    li []
+                      [
+                        form
+                          [
+                            A.action "/upload";
+                            A.enctype "multipart/form-data";
+                            A.target "_self";
+                            A.method_ "POST";
+                          ]
+                          [
+                            label [] [ txt "my beautiful form" ];
+                            input [ A.type_ "file"; A.name "file1" ];
+                            input [ A.type_ "file"; A.name "file2" ];
+                            input
+                              [
+                                A.type_ "text";
+                                A.name "a";
+                                A.placeholder "text A";
+                              ];
+                            input
+                              [
+                                A.type_ "text";
+                                A.name "b";
+                                A.placeholder "text B";
+                              ];
+                            input [ A.type_ "submit" ];
+                          ];
+                      ];
+                  ];
+              ];
+          ]
+      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