Improve the API to be more user-friendly (@pitag-ha)

src/http_mirage_client.ml

@@ -5,16 +5,23 @@ let tls_config = Mimic.make ~name:"tls-config"
 
 open Lwt.Infix
 
+type t =
+  { ctx : Mimic.ctx
+  ; alpn_protocol : Mimic.flow -> string option
+  ; authenticator : (X509.Authenticator.t, [ `Msg of string ]) result }
+
 module type S = sig
-  val connect : Mimic.ctx -> Mimic.ctx Lwt.t
-  val alpn_protocol : Mimic.flow -> string option
-  val authenticator : (X509.Authenticator.t, [> `Msg of string ]) result
+  type nonrec t = t
+
+  val connect : Mimic.ctx -> t Lwt.t
 end
 
 module Make
   (Pclock : Mirage_clock.PCLOCK)
   (TCP : Tcpip.Tcp.S)
   (Happy_eyeballs : Mimic_happy_eyeballs.S with type flow = TCP.flow) : S = struct
+  type nonrec t = t
+
   module TCP = struct
     include TCP
     type endpoint = Happy_eyeballs.t * string * int
@@ -60,23 +67,6 @@ module Make
   let tls_edn, tls_protocol =
     Mimic.register ~name:"tls" (module TLS)
 
-  let connect ctx =
-    let k0 happy_eyeballs http_scheme http_hostname http_port = match http_scheme with
-      | "http" -> Lwt.return_some (happy_eyeballs, http_hostname, http_port)
-      | _      -> Lwt.return_none in
-    let k1 happy_eyeballs http_scheme http_hostname http_port tls_config = match http_scheme with
-      | "https" -> Lwt.return_some (happy_eyeballs, tls_config, http_hostname, http_port)
-      | _       -> Lwt.return_none in
-    let ctx = Mimic.fold tcp_edn
-      Mimic.Fun.[ req Happy_eyeballs.happy_eyeballs
-                ; req http_scheme; req http_hostname; dft http_port 80 ]
-      ~k:k0 ctx in
-    Lwt.return (Mimic.fold tls_edn
-                  Mimic.Fun.[ req Happy_eyeballs.happy_eyeballs
-                            ; req http_scheme; req http_hostname; dft http_port 443
-                            ; req tls_config ]
-                  ~k:k1 ctx)
-
   let alpn_protocol flow =
     let module M = (val (Mimic.repr tls_protocol)) in
     match flow with
@@ -89,6 +79,24 @@ module Make
   let authenticator =
     let module V = Ca_certs_nss.Make (Pclock) in
     V.authenticator ()
+
+  let connect ctx =
+    let k0 happy_eyeballs http_scheme http_hostname http_port = match http_scheme with
+      | "http" -> Lwt.return_some (happy_eyeballs, http_hostname, http_port)
+      | _      -> Lwt.return_none in
+    let k1 happy_eyeballs http_scheme http_hostname http_port tls_config = match http_scheme with
+      | "https" -> Lwt.return_some (happy_eyeballs, tls_config, http_hostname, http_port)
+      | _       -> Lwt.return_none in
+    let ctx = Mimic.fold tcp_edn
+      Mimic.Fun.[ req Happy_eyeballs.happy_eyeballs
+                ; req http_scheme; req http_hostname; dft http_port 80 ]
+      ~k:k0 ctx in
+    let ctx = Mimic.fold tls_edn
+                  Mimic.Fun.[ req Happy_eyeballs.happy_eyeballs
+                            ; req http_scheme; req http_hostname; dft http_port 443
+                            ; req tls_config ]
+                  ~k:k1 ctx in
+    Lwt.return { ctx; alpn_protocol; authenticator; }
 end
 
 module Version = Httpaf.Version
@@ -310,9 +318,7 @@ let resolve_location ~uri ~location =
 let one_request
   ?config
   ?tls_config:cfg
-  ~ctx
-  ~alpn_protocol
-  ~authenticator
+  { ctx; alpn_protocol; authenticator; }
   ?(meth= `GET)
   ?(headers= [])
   ?body

src/http_mirage_client.mli

@@ -1,7 +1,9 @@
+type t
+
 module type S = sig
-  val connect : Mimic.ctx -> Mimic.ctx Lwt.t
-  val alpn_protocol : Mimic.flow -> string option
-  val authenticator : (X509.Authenticator.t, [> `Msg of string ]) result
+  type nonrec t = t
+
+  val connect : Mimic.ctx -> t Lwt.t
 end
 
 module Make
@@ -22,9 +24,7 @@ type response =
 val one_request :
   ?config:[ `H2 of H2.Config.t | `HTTP_1_1 of Httpaf.Config.t ] ->
   ?tls_config:Tls.Config.client ->
-  ctx:Mimic.ctx ->
-  alpn_protocol:(Mimic.flow -> string option) ->
-  authenticator:(X509.Authenticator.t, [> `Msg of string ]) result ->
+  t ->
   ?meth:Httpaf.Method.t ->
   ?headers:(string * string) list ->
   ?body:string ->