refactor: remove various [open Cohttp]

cohttp-async/src/body.ml

@@ -71,11 +71,10 @@ let write_body write_body (body : t) writer =
   | `Pipe p -> Pipe.iter p ~f:(write_body writer)
 
 let pipe_of_body read_chunk ic =
-  let open Cohttp.Transfer in
   Pipe.create_reader ~close_on_exception:false (fun writer ->
       Deferred.repeat_until_finished () (fun () ->
           read_chunk ic >>= function
-          | Chunk buf ->
+          | Cohttp.Transfer.Chunk buf ->
               (* Even if [writer] has been closed, the loop must continue reading
                * from the input channel to ensure that it is left in a proper state
                * for the next request to be processed (in the case of keep-alive).

cohttp-async/src/body.mli

@@ -1,6 +1,5 @@
 open! Base
 open! Async_kernel
-open! Cohttp
 
 type t = [ Cohttp.Body.t | `Pipe of string Pipe.Reader.t ] [@@deriving sexp_of]
 
@@ -21,7 +20,7 @@ module Private : sig
     ('a -> string -> unit Deferred.t) -> t -> 'a -> unit Deferred.t
 
   val pipe_of_body :
-    ('a -> Transfer.chunk Deferred.t) -> 'a -> string Pipe.Reader.t
+    ('a -> Cohttp.Transfer.chunk Deferred.t) -> 'a -> string Pipe.Reader.t
 
   val disable_chunked_encoding : t -> (t * int64) Deferred.t
   val drain : t -> unit Deferred.t

cohttp-bench/lwt_unix_server.ml

@@ -1,4 +1,4 @@
-open Cohttp_lwt_unix
+module Server = Cohttp_lwt_unix.Server
 
 let length = 2053
 let text = String.make length 'a'

cohttp-lwt/src/body.ml

@@ -14,7 +14,8 @@
  *
   }}}*)
 
-open Cohttp
+module Body = Cohttp.Body
+module Transfer = Cohttp.Transfer
 open Lwt
 
 type t = [ Body.t | `Stream of (string Lwt_stream.t[@sexp.opaque]) ]
@@ -30,10 +31,10 @@ let create_stream fn arg =
       | false -> (
           fn arg >>= function
           | Transfer.Done -> return_none
-          | Transfer.Final_chunk c ->
+          | Final_chunk c ->
               fin := true;
               return (Some c)
-          | Transfer.Chunk c -> return (Some c)))
+          | Chunk c -> return (Some c)))
 
 let is_empty (body : t) =
   match body with