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Merge pull request 'stream the response body' (#2) from reply-stream into main

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Reviewed-on: https://git.robur.io/robur/http-mirage-client/pulls/2
This commit is contained in:
dinosaure 2022-10-31 16:08:55 +00:00
commit 7145e7aa8f
5 changed files with 249 additions and 67 deletions
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3
README.md
View file

@ -52,7 +52,8 @@ open Lwt.Infix
module Make (HTTP_client : Http_mirage_client.S) = struct
let start http_client =
Http_mirage_client.one_request http_client "https://mirage.io/"
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 _ -> ...

125
src/http_mirage_client.ml
View file

@ -153,7 +153,8 @@ let prepare_http_1_1_headers headers host user_pass body_length =
| Some v -> add headers "content-length" (string_of_int v) in
add_authentication ~add headers user_pass
let single_http_1_1_request ?config flow user_pass host meth path headers body =
let single_http_1_1_request
?config flow user_pass host meth path headers body f f_init =
let body_length = Option.map String.length body in
let headers = prepare_http_1_1_headers headers host user_pass body_length in
let req = Httpaf.Request.create ~headers meth path in
@ -163,34 +164,26 @@ let single_http_1_1_request ?config flow user_pass host meth path headers body =
fun v ->
if not !w then Lwt.wakeup_later notify_finished v
; w := true in
let on_eof response data () = wakeup (Ok (response, data)) in
let response_handler response body =
let buf = Buffer.create 0x100 in
let rec on_eof () =
let response =
{
version= response.Httpaf.Response.version
; status= (response.Httpaf.Response.status :> H2.Status.t)
; reason= response.Httpaf.Response.reason
; headers=
H2.Headers.of_list
(Httpaf.Headers.to_list response.Httpaf.Response.headers)
} in
wakeup (Ok (response, Some (Buffer.contents buf)))
and on_read ba ~off ~len =
Buffer.add_string buf (Bigstringaf.substring ~off ~len ba)
; Httpaf.Body.schedule_read body ~on_read ~on_eof in
let on_eof () =
let response =
{
version= response.Httpaf.Response.version
; status= (response.Httpaf.Response.status :> H2.Status.t)
; reason= response.Httpaf.Response.reason
; headers=
H2.Headers.of_list
(Httpaf.Headers.to_list response.Httpaf.Response.headers)
} in
wakeup (Ok (response, None)) in
Httpaf.Body.schedule_read body ~on_read ~on_eof in
let response =
{
version= response.Httpaf.Response.version
; status= (response.Httpaf.Response.status :> H2.Status.t)
; reason= response.Httpaf.Response.reason
; headers=
H2.Headers.of_list
(Httpaf.Headers.to_list response.Httpaf.Response.headers)
} in
let rec on_read on_eof acc ba ~off ~len =
let acc =
acc >>= fun acc -> f response acc (Bigstringaf.substring ~off ~len ba)
in
Httpaf.Body.schedule_read body ~on_read:(on_read on_eof acc)
~on_eof:(on_eof response acc) in
let f_init = Lwt.return f_init in
Httpaf.Body.schedule_read body ~on_read:(on_read on_eof f_init)
~on_eof:(on_eof response f_init) in
let error_handler e =
let err =
match e with
@ -216,8 +209,8 @@ let prepare_h2_headers headers host user_pass body_length =
(string_of_int (Option.value ~default:0 body_length)) in
add_authentication ~add headers user_pass
let single_h2_request ?config ~scheme flow user_pass host meth path headers body
=
let single_h2_request
?config ~scheme flow user_pass host meth path headers body f f_init =
let body_length = Option.map String.length body in
let headers = prepare_h2_headers headers host user_pass body_length in
let req = H2.Request.create ~scheme ~headers meth path in
@ -227,30 +220,24 @@ let single_h2_request ?config ~scheme flow user_pass host meth path headers body
fun v ->
if not !w then Lwt.wakeup_later notify_finished v
; w := true in
let on_eof response data () = wakeup (Ok (response, data)) in
let response_handler response response_body =
let buf = Buffer.create 0x100 in
let rec on_eof () =
let response =
{
version= {major= 2; minor= 0}
; status= response.H2.Response.status
; reason= ""
; headers= response.H2.Response.headers
} in
wakeup (Ok (response, Some (Buffer.contents buf)))
and on_read ba ~off ~len =
Buffer.add_string buf (Bigstringaf.substring ~off ~len ba)
; H2.Body.Reader.schedule_read response_body ~on_read ~on_eof in
let on_eof () =
let response =
{
version= {major= 2; minor= 0}
; status= response.H2.Response.status
; reason= ""
; headers= response.H2.Response.headers
} in
wakeup (Ok (response, None)) in
H2.Body.Reader.schedule_read response_body ~on_read ~on_eof in
let response =
{
version= {major= 2; minor= 0}
; status= response.H2.Response.status
; reason= ""
; headers= response.H2.Response.headers
} in
let rec on_read on_eof acc ba ~off ~len =
let acc =
acc >>= fun acc -> f response acc (Bigstringaf.substring ~off ~len ba)
in
H2.Body.Reader.schedule_read response_body ~on_read:(on_read on_eof acc)
~on_eof:(on_eof response acc) in
let f_init = Lwt.return f_init in
H2.Body.Reader.schedule_read response_body ~on_read:(on_read on_eof f_init)
~on_eof:(on_eof response f_init) in
let error_handler e =
let err =
match e with
@ -319,7 +306,8 @@ let alpn_protocol_of_string = function
| "h2" -> Some `H2
| _ -> None
let single_request ~ctx ~alpn_protocol ?config cfg ~meth ~headers ?body uri =
let single_request
~ctx ~alpn_protocol ?config cfg ~meth ~headers ?body uri f f_init =
Lwt.return (decode_uri ~ctx uri)
>>? fun (ctx, scheme, host, user_pass, path) ->
let ctx =
@ -333,19 +321,26 @@ let single_request ~ctx ~alpn_protocol ?config cfg ~meth ~headers ?body uri =
Mimic.resolve ctx >>? fun flow ->
(match Option.bind (alpn_protocol flow) alpn_protocol_of_string, config with
| (Some `HTTP_1_1 | None), Some (`HTTP_1_1 config) ->
single_http_1_1_request ~config flow user_pass host meth path headers body
single_http_1_1_request ~config flow user_pass host meth path headers body f
f_init
| (Some `HTTP_1_1 | None), None ->
single_http_1_1_request flow user_pass host meth path headers body
single_http_1_1_request flow user_pass host meth path headers body f f_init
| (Some `H2 | None), Some (`H2 config) ->
single_h2_request ~config ~scheme flow user_pass host meth path headers body
f f_init
| Some `H2, None ->
single_h2_request ~scheme flow user_pass host meth path headers body
single_h2_request ~scheme flow user_pass host meth path headers body f
f_init
| Some `H2, Some (`HTTP_1_1 _) ->
single_h2_request ~scheme flow user_pass host meth path headers body
single_h2_request ~scheme flow user_pass host meth path headers body f
f_init
| Some `HTTP_1_1, Some (`H2 _) ->
single_http_1_1_request flow user_pass host meth path headers body)
single_http_1_1_request flow user_pass host meth path headers body f f_init)
>>= fun r ->
Mimic.close flow >|= fun () -> r
Mimic.close flow >>= fun () ->
match r with
| Error _ as e -> Lwt.return e
| Ok (resp, body) -> Lwt.map (fun body -> Ok (resp, body)) body
let tls_config ?tls_config ?config authenticator user's_authenticator =
lazy
@ -378,7 +373,7 @@ let resolve_location ~uri ~location =
| _ -> Error (`Msg ("expected an absolute uri, got: " ^ uri)))
| _ -> Error (`Msg ("unknown location (relative path): " ^ location))
let one_request
let request
?config
?tls_config:cfg
{ctx; alpn_protocol; authenticator}
@ -388,18 +383,20 @@ let one_request
?body
?(max_redirect = 5)
?(follow_redirect = true)
uri =
uri
f
f_init =
let tls_config =
tls_config ?tls_config:cfg ?config authenticator user's_authenticator in
if not follow_redirect then
single_request ~ctx ~alpn_protocol ?config tls_config ~meth ~headers ?body
uri
uri f f_init
else
let rec follow_redirect count uri =
if count = 0 then Lwt.return_error (`Msg "Redirect limit exceeded")
else
single_request ~ctx ~alpn_protocol ?config tls_config ~meth ~headers
?body uri
?body uri f f_init
>>? fun (resp, body) ->
if Status.is_redirection resp.status then
match Headers.get resp.headers "location" with

11
src/http_mirage_client.mli
View file

@ -22,7 +22,7 @@ type response = {
; headers: Headers.t
}
val one_request :
val request :
?config:[ `H2 of H2.Config.t | `HTTP_1_1 of Httpaf.Config.t ]
-> ?tls_config:Tls.Config.client
-> t
@ -33,4 +33,11 @@ val one_request :
-> ?max_redirect:int
-> ?follow_redirect:bool
-> string
-> (response * string option, [> Mimic.error ]) result Lwt.t
-> (response -> 'a -> string -> 'a Lwt.t)
-> 'a
-> (response * 'a, [> Mimic.error ]) result Lwt.t
(** [request ~config ~tls_config t ~authenticator ~meth ~headers ~body
~max_redirect ~follow_redirect url body_f body_init] does a HTTP request
to [url] using [meth] and the HTTP protocol in [config]. The response is
the value of this function. The body is provided in chunks (see [body_f]).
Reasonably defaults are used if not provided. *)

10
test/dune Normal file
View file

@ -0,0 +1,10 @@
(executable
(name test)
(libraries http-mirage-client tcpip.stack-socket paf.mirage
mirage-clock-unix mirage-random-stdlib happy-eyeballs-lwt mirage-time-unix
mimic-happy-eyeballs alcotest-lwt))
(rule
(alias runtest)
(action
(run ./test.exe --color=always)))

167
test/test.ml Normal file
View file

@ -0,0 +1,167 @@
(* Functoria *)
module DNS_client = Dns_client_mirage.Make (Mirage_random_stdlib) (Time) (Mclock) (Pclock) (Tcpip_stack_socket.V4V6)
module Happy_eyeballs = Happy_eyeballs_mirage.Make (Time) (Mclock) (Tcpip_stack_socket.V4V6) (DNS_client)
module Mimic_happy_eyeballs = Mimic_happy_eyeballs.Make (Tcpip_stack_socket.V4V6) (DNS_client) (Happy_eyeballs)
module HTTP_server = Paf_mirage.Make (Tcpip_stack_socket.V4V6.TCP)
module HTTP_client = Http_mirage_client.Make (Pclock) (Tcpip_stack_socket.V4V6.TCP) (Mimic_happy_eyeballs)
let http_1_1_error_handler ?notify (ipaddr, port) ?request:_ error respond =
let contents = match error with
| `Bad_gateway -> Fmt.str "Bad gateway (%a:%d)" Ipaddr.pp ipaddr port
| `Bad_request -> Fmt.str "Bad request (%a:%d)" Ipaddr.pp ipaddr port
| `Exn exn -> Fmt.str "Exception %S (%a:%d)" (Printexc.to_string exn) Ipaddr.pp ipaddr port
| `Internal_server_error -> Fmt.str "Internal server error (%a:%d)" Ipaddr.pp ipaddr port in
let open Httpaf in
Option.iter (fun push -> push (Some ((ipaddr, port), error))) notify ;
let headers = Headers.of_list
[ "content-type", "text/plain"
; "content-length", string_of_int (String.length contents)
; "connection", "close" ] in
let body = respond headers in
Body.write_string body contents ;
Body.close_writer body
let alpn_error_handler
: type reqd headers request response ro wo.
?notify:(((Ipaddr.t * int) * Alpn.server_error) option -> unit) ->
(Ipaddr.t * int) -> (reqd, headers, request, response, ro, wo) Alpn.protocol ->
?request:request -> Alpn.server_error -> (headers -> wo) -> unit
= fun ?notify (ipaddr, port) protocol ?request:_ error respond ->
let contents = match error with
| `Bad_gateway -> Fmt.str "Bad gateway (%a:%d)" Ipaddr.pp ipaddr port
| `Bad_request -> Fmt.str "Bad request (%a:%d)" Ipaddr.pp ipaddr port
| `Exn exn -> Fmt.str "Exception %S (%a:%d)" (Printexc.to_string exn) Ipaddr.pp ipaddr port
| `Internal_server_error -> Fmt.str "Internal server error (%a:%d)" Ipaddr.pp ipaddr port in
Option.iter (fun push -> push (Some ((ipaddr, port), error))) notify ;
let headers =
[ "content-type", "text/plain"
; "content-length", string_of_int (String.length contents) ] in
match protocol with
| Alpn.HTTP_1_1 _ ->
let open Httpaf in
let headers = Headers.of_list (("connection", "close") :: headers) in
let body = respond headers in
Body.write_string body contents ;
Body.close_writer body
| Alpn.H2 _ ->
let open H2 in
let headers = Headers.of_list headers in
let body = respond headers in
H2.Body.Writer.write_string body contents ;
H2.Body.Writer.close body
type alpn_handler =
{ handler : 'reqd 'headers 'request 'response 'ro 'wo.
'reqd -> ('reqd, 'headers, 'request, 'response, 'ro, 'wo) Alpn.protocol -> unit }
[@@unboxed]
let server ?error ?stop stack = function
| `HTTP_1_1 (port, handler) ->
let open Lwt.Syntax in
let+ http_server = HTTP_server.init ~port stack in
let http_service = HTTP_server.http_service ~error_handler:(http_1_1_error_handler ?notify:error)
(fun _flow (_ipaddr, _port) -> handler) in
HTTP_server.serve ?stop http_service http_server
| `ALPN (tls, port, handler) ->
let open Lwt.Syntax in
let alpn_handler =
{ Alpn.error= (fun edn protocol ?request v respond -> alpn_error_handler ?notify:error edn protocol ?request v respond)
; Alpn.request= (fun _flow (_ipaddr, _port) reqd protocol -> handler.handler reqd protocol) } in
let+ http_server = HTTP_server.init ~port stack in
let alpn_service = HTTP_server.alpn_service ~tls alpn_handler in
HTTP_server.serve ?stop alpn_service http_server
let stack ipaddr =
let open Lwt.Syntax in
let* tcpv4v6 = Tcpip_stack_socket.V4V6.TCP.connect ~ipv4_only:false ~ipv6_only:false
ipaddr None in
let* udpv4v6 = Tcpip_stack_socket.V4V6.UDP.connect ~ipv4_only:false ~ipv6_only:false
ipaddr None in
Tcpip_stack_socket.V4V6.connect udpv4v6 tcpv4v6
let test01 =
Alcotest_lwt.test_case "Simple Hello World! (GET)" `Quick @@ fun _sw () ->
let open Lwt.Syntax in
let stop = Lwt_switch.create () in
let handler reqd =
let open Httpaf in
let contents = "Hello World!" in
let headers = Headers.of_list
[ "content-type", "text/plain"
; "content-length", string_of_int (String.length contents)
; "connection", "close" ] in
let response = Response.create ~headers `OK in
Reqd.respond_with_string reqd response contents in
let* stack = stack Ipaddr.V4.Prefix.loopback in
let happy_eyeballs = Happy_eyeballs.create stack in
let* ctx = Mimic_happy_eyeballs.connect happy_eyeballs in
let* t = HTTP_client.connect ctx in
let* `Initialized _thread = server ~stop (Tcpip_stack_socket.V4V6.tcp stack)
(`HTTP_1_1 (8080, handler)) in
let* result = Http_mirage_client.request t "http://localhost:8080/"
(fun _response buf str -> Buffer.add_string buf str ; Lwt.return buf)
(Buffer.create 0x100) in
match result with
| Error err ->
let* () = Lwt_switch.turn_off stop in
let* () = Tcpip_stack_socket.V4V6.disconnect stack in
Alcotest.failf "Client error: %a" Mimic.pp_error err
| Ok (_response, buf) ->
let* () = Lwt_switch.turn_off stop in
let* () = Tcpip_stack_socket.V4V6.disconnect stack in
let body = Buffer.contents buf in
Alcotest.(check string) "body" "Hello World!" body ;
Lwt.return_unit
let random_string ~len =
let res = Bytes.create len in
for i = 0 to len - 1 do
Bytes.set res i (Char.chr (Random.bits () land 0xff))
done ; Bytes.unsafe_to_string res
let test02 =
Alcotest_lwt.test_case "Repeat (POST)" `Quick @@ fun _sw () ->
let open Lwt.Syntax in
let stop = Lwt_switch.create () in
let handler reqd =
let open Httpaf in
let { Request.meth; _ } = Reqd.request reqd in
if meth <> `POST then invalid_arg "Invalid HTTP method" ;
let headers = Headers.of_list
[ "content-type", "text/plain" ] in
let response = Response.create ~headers `OK in
let src = Reqd.request_body reqd in
let dst = Reqd.respond_with_streaming reqd response in
let rec on_eof () =
Body.close_reader src ;
Body.close_writer dst
and on_read buf ~off ~len =
Body.write_bigstring dst ~off ~len buf ;
Body.schedule_read src ~on_eof ~on_read in
Body.schedule_read src ~on_eof ~on_read in
let* stack = stack Ipaddr.V4.Prefix.loopback in
let happy_eyeballs = Happy_eyeballs.create stack in
let* ctx = Mimic_happy_eyeballs.connect happy_eyeballs in
let* t = HTTP_client.connect ctx in
let* `Initialized _thread = server ~stop (Tcpip_stack_socket.V4V6.tcp stack)
(`HTTP_1_1 (8080, handler)) in
let str = random_string ~len:0x1000 in
let* result = Http_mirage_client.request ~meth:`POST ~body:str t "http://localhost:8080/"
(fun _response buf str -> Buffer.add_string buf str ; Lwt.return buf)
(Buffer.create 0x1000) in
match result with
| Error err ->
let* () = Lwt_switch.turn_off stop in
let* () = Tcpip_stack_socket.V4V6.disconnect stack in
Alcotest.failf "Client error: %a" Mimic.pp_error err
| Ok (_response, buf) ->
let* () = Lwt_switch.turn_off stop in
let* () = Tcpip_stack_socket.V4V6.disconnect stack in
let body = Buffer.contents buf in
Alcotest.(check string) "body" str body ;
Lwt.return_unit
let () = Alcotest_lwt.run "http-mirage-client"
[ "http/1.1", [ test01; test02 ] ]
|> Lwt_main.run