ligo/src/lib_p2p/p2p_fd.ml
2019-02-19 21:43:52 +01:00

108 lines
4.0 KiB
OCaml

(*****************************************************************************)
(* *)
(* Open Source License *)
(* Copyright (c) 2018 Dynamic Ledger Solutions, Inc. <contact@tezos.com> *)
(* *)
(* Permission is hereby granted, free of charge, to any person obtaining a *)
(* copy of this software and associated documentation files (the "Software"),*)
(* to deal in the Software without restriction, including without limitation *)
(* the rights to use, copy, modify, merge, publish, distribute, sublicense, *)
(* and/or sell copies of the Software, and to permit persons to whom the *)
(* Software is furnished to do so, subject to the following conditions: *)
(* *)
(* The above copyright notice and this permission notice shall be included *)
(* in all copies or substantial portions of the Software. *)
(* *)
(* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR*)
(* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, *)
(* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL *)
(* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER*)
(* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING *)
(* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER *)
(* DEALINGS IN THE SOFTWARE. *)
(* *)
(*****************************************************************************)
(* logging facility to monitor sockets *)
let is_not_windows = Sys.os_type <> "Win32"
let () =
(* Otherwise some writes trigger a SIGPIPE instead of raising an
Lwt_unit exception. In the node, this is already done by
Cohttp, so this is only useful when using the P2P layer as a
stand alone library. *)
if is_not_windows then
Sys.(set_signal sigpipe Signal_ignore)
(* Logging facility for the P2P layer *)
module Log = Logging.Make(struct let name = "p2p.fd" end)
type t = {
fd : Lwt_unix.file_descr ;
id : int ;
mutable nread : int ;
mutable nwrit : int ;
}
(* we use a prefix ' cnx:' that allows easy grepping in the log to lookup
everything related to a particular connection. *)
let log t fmt =
Format.kasprintf (fun s -> Log.log_info "cnx:%d:%s" t.id s) fmt
let create =
let counter = ref 0 in
function fd ->
incr counter;
let t = { fd ; id = !counter ; nread = 0 ; nwrit = 0 } in
log t "create: fd %d" t.id ;
t
let string_of_sockaddr addr =
match addr with
| Lwt_unix.ADDR_INET (ip, port) ->
Printf.sprintf "%s:%d" (Unix.string_of_inet_addr ip) port
| Lwt_unix.ADDR_UNIX file ->
Printf.sprintf "@%s" file
let id t = t.id
let socket proto kind arg =
create (Lwt_unix.socket proto kind arg)
let close t =
log t "close: stats %d/%d" t.nread t.nwrit ;
Lwt_utils_unix.safe_close t.fd
let read t buf pos len =
log t "try-read: %d" len;
Lwt_bytes.read t.fd buf pos len >>= fun nread ->
t.nread <- t.nread + nread ;
log t "read: %d (%d)" nread t.nread ;
Lwt.return nread
let write t buf =
let len = MBytes.length buf in
log t "try-write: %d" len;
Lwt_utils_unix.write_mbytes t.fd buf >>= fun () ->
t.nwrit <- t.nwrit + len ;
log t "written: %d (%d)" len t.nwrit ;
Lwt.return ()
let connect t saddr =
log t "connect: %s" (string_of_sockaddr saddr);
Lwt_unix.connect t.fd saddr
let accept sock =
Lwt_unix.accept sock >>= fun (fd, saddr) ->
let t = create fd in
log t "accept: %s" (string_of_sockaddr saddr);
Lwt.return (t, saddr)
module Table =
Hashtbl.Make(struct
type nonrec t = t
let equal { id = x ; _ } { id = y ; _ } = x = y
let hash { id ; _ } = Hashtbl.hash id
end)