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|
(************************************************************************)
(* v * The Coq Proof Assistant / The Coq Development Team *)
(* <O___,, * INRIA - CNRS - LIX - LRI - PPS - Copyright 1999-2017 *)
(* \VV/ **************************************************************)
(* // * This file is distributed under the terms of the *)
(* * GNU Lesser General Public License Version 2.1 *)
(************************************************************************)
let debug = false
type priority = Low | High
let string_of_priority = function Low -> "low" | High -> "high"
let priority_of_string = function
| "low" -> Low
| "high" -> High
| _ -> raise (Invalid_argument "priority_of_string")
type request =
| Hello of priority
| Get of int
| TryGet of int
| GiveBack of int
| Ping
type response =
| Tokens of int
| Noluck
| Pong of int * int * int
exception ParseError
(* make it work with telnet: strip trailing \r *)
let strip_r s =
let len = String.length s in
if s.[len - 1] <> '\r' then s else String.sub s 0 (len - 1)
let positive_int_of_string n =
try
let n = int_of_string n in
if n <= 0 then raise ParseError else n
with Invalid_argument _ | Failure _ -> raise ParseError
let parse_request s =
if debug then Printf.eprintf "parsing '%s'\n" s;
match Str.split (Str.regexp " ") (strip_r s) with
| [ "HELLO"; "LOW" ] -> Hello Low
| [ "HELLO"; "HIGH" ] -> Hello High
| [ "GET"; n ] -> Get (positive_int_of_string n)
| [ "TRYGET"; n ] -> TryGet (positive_int_of_string n)
| [ "GIVEBACK"; n ] -> GiveBack (positive_int_of_string n)
| [ "PING" ] -> Ping
| _ -> raise ParseError
let parse_response s =
if debug then Printf.eprintf "parsing '%s'\n" s;
match Str.split (Str.regexp " ") (strip_r s) with
| [ "TOKENS"; n ] -> Tokens (positive_int_of_string n)
| [ "NOLUCK" ] -> Noluck
| [ "PONG"; n; m; p ] ->
let n = try int_of_string n with _ -> raise ParseError in
let m = try int_of_string m with _ -> raise ParseError in
let p = try int_of_string p with _ -> raise ParseError in
Pong (n,m,p)
| _ -> raise ParseError
let print_request = function
| Hello Low -> "HELLO LOW\n"
| Hello High -> "HELLO HIGH\n"
| Get n -> Printf.sprintf "GET %d\n" n
| TryGet n -> Printf.sprintf "TRYGET %d\n" n
| GiveBack n -> Printf.sprintf "GIVEBACK %d\n" n
| Ping -> "PING\n"
let print_response = function
| Tokens n -> Printf.sprintf "TOKENS %d\n" n
| Noluck -> "NOLUCK\n"
| Pong (n,m,p) -> Printf.sprintf "PONG %d %d %d\n" n m p
let connect s =
try
match Str.split (Str.regexp ":") s with
| [ h; p ] ->
let open Unix in
let s = socket PF_INET SOCK_STREAM 0 in
connect s (ADDR_INET (inet_addr_of_string h,int_of_string p));
Some s
| _ -> None
with Unix.Unix_error _ -> None
let manager = ref None
let option_map f = function None -> None | Some x -> Some (f x)
let init p =
try
let sock = Sys.getenv "COQWORKMGR_SOCK" in
manager := option_map (fun s ->
let cout = Unix.out_channel_of_descr s in
set_binary_mode_out cout true;
let cin = Unix.in_channel_of_descr s in
set_binary_mode_in cin true;
output_string cout (print_request (Hello p)); flush cout;
cin, cout) (connect sock)
with Not_found | End_of_file -> ()
let with_manager f g =
try
match !manager with
| None -> f ()
| Some (cin, cout) -> g cin cout
with
| ParseError | End_of_file -> manager := None; f ()
let get n =
with_manager
(fun () -> n)
(fun cin cout ->
output_string cout (print_request (Get n));
flush cout;
let l = input_line cin in
match parse_response l with
| Tokens m -> m
| _ -> raise (Failure "coqworkmgr protocol error"))
let tryget n =
with_manager
(fun () -> Some n)
(fun cin cout ->
output_string cout (print_request (TryGet n));
flush cout;
let l = input_line cin in
match parse_response l with
| Tokens m -> Some m
| Noluck -> None
| _ -> raise (Failure "coqworkmgr protocol error"))
let giveback n =
with_manager
(fun () -> ())
(fun cin cout ->
output_string cout (print_request (GiveBack n));
flush cout)
|
