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module Httpaf = Dream_httpaf_.Httpaf
module IOVec = Httpaf.IOVec
type error = [ `Exn of exn ]
type mode =
[ `Client of unit -> int32
| `Server
]
type t =
{ faraday : Faraday.t
; mode : mode
; mutable wakeup : Optional_thunk.t
; error_handler: error_handler
; mutable error_code: [`Ok | error ]
}
and error_handler = t -> error -> unit
let default_ready_to_write = Sys.opaque_identity (fun () -> ())
let create ~error_handler mode =
{ faraday = Faraday.create 0x1000
; mode
; wakeup = Optional_thunk.none
; error_handler
; error_code = `Ok
}
let mask t =
match t.mode with
| `Client m -> Some (m ())
| `Server -> None
let is_closed t =
Faraday.is_closed t.faraday
let on_wakeup t k =
if Faraday.is_closed t.faraday
then failwith "on_wakeup on closed writer"
else if Optional_thunk.is_some t.wakeup
then failwith "on_wakeup: only one callback can be registered at a time"
else t.wakeup <- Optional_thunk.some k
let wakeup t =
let f = t.wakeup in
t.wakeup <- Optional_thunk.none;
Optional_thunk.call_if_some f
let schedule t ?(is_fin=true) ~kind payload ~off ~len =
let mask = mask t in
Serialize.schedule_serialize
t.faraday
?mask
~is_fin
~opcode:(kind :> Websocket.Opcode.t)
~src_off:0
~payload ~off ~len;
wakeup t
let send_bytes t ?(is_fin=true) ~kind payload ~off ~len =
let mask = mask t in
Serialize.serialize_bytes
t.faraday
?mask
~is_fin
~opcode:(kind :> Websocket.Opcode.t)
~payload
~src_off:0
~off
~len;
wakeup t
let send_ping ?application_data t =
begin match application_data with
| None -> Serialize.serialize_control t.faraday ~opcode:`Ping
| Some { IOVec.buffer; off; len } ->
let mask = mask t in
Serialize.schedule_serialize
t.faraday
?mask
~is_fin:true
~opcode:`Ping
~src_off:0
~payload:buffer
~off
~len;
end;
wakeup t
let send_pong ?application_data t =
begin match application_data with
| None -> Serialize.serialize_control t.faraday ~opcode:`Pong;
| Some { IOVec.buffer; off; len } ->
let mask = mask t in
Serialize.schedule_serialize
t.faraday
?mask
~is_fin:true
~opcode:`Pong
~src_off:0
~payload:buffer
~off
~len;
end;
wakeup t
let flushed t f = Faraday.flush t.faraday f
let close ?code t =
begin match code with
| Some code ->
let mask = mask t in
let payload = Bytes.create 2 in
Bytes.set_uint16_be payload 0 (Websocket.Close_code.to_int code);
Serialize.serialize_bytes t.faraday
?mask
~is_fin:true
~opcode:`Connection_close
~src_off:0
~payload ~off:0 ~len:2;
| None -> ()
end;
Faraday.close t.faraday;
wakeup t
let error_code t =
match t.error_code with
| #error as error -> Some error
| `Ok -> None
let report_error t error =
match t.error_code with
| `Ok ->
t.error_code <- (error :> [`Ok | error]);
if not (is_closed t)
then t.error_handler t error
| `Exn _exn ->
close ~code:`Abnormal_closure t
let next t =
match Faraday.operation t.faraday with
| `Close -> `Close 0
| `Yield -> `Yield
| `Writev iovecs -> `Write iovecs
let report_result t result =
match result with
| `Closed -> close t
| `Ok len -> Faraday.shift t.faraday len