package vcaml
OCaml bindings for the Neovim API
Install
Dune Dependency
Authors
Maintainers
Sources
vcaml-v0.16.0.tar.gz
sha256=dd123302c46af7ca6eda8a7806c78236fd217a8c73a2e1cd7da85f1d69ed1ae4
doc/src/vcaml.msgpack_debug/msgpack_debug.ml.html
Source file msgpack_debug.ml
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open! Core open! Async module Man_in_the_middle_debugger = Man_in_the_middle_debugger.Make (struct type message = Msgpack.t let parser_ = Msgpack.Internal.Parser.msg let to_string = Msgpack.string_of_t_exn ?bufsize:None end) let create_debug_printers ?(pp = Msgpack.pp ?pp_ext:None) ?(color = false) ~peer1 ~peer2 log = let formatter = Format.formatter_of_out_channel log in let maybe_color = match color with | false -> fun s _color -> s | true -> fun s color -> Console.Ansi.string_with_attr [ color; `Bright ] s in let peer1 = maybe_color peer1 `Blue in let peer2 = maybe_color peer2 `Yellow in let create_debug_printer ~label message = let open Format in pp_open_hovbox formatter 0; pp_print_string formatter label; pp_print_char formatter ':'; pp_print_space formatter (); pp formatter message; pp_close_box formatter (); pp_print_newline formatter () in let peer_1_to_2 = create_debug_printer ~label:[%string "%{peer1} -> %{peer2}"] in let peer_2_to_1 = create_debug_printer ~label:[%string "%{peer2} -> %{peer1}"] in `Peer_1_to_2 peer_1_to_2, `Peer_2_to_1 peer_2_to_1 ;; let connect_peers_and_listen ?pp ?color ~peer1 ~peer2 ~log () = let `Peer_1_to_2 peer_1_to_2, `Peer_2_to_1 peer_2_to_1 = create_debug_printers ?pp ?color ~peer1:peer1.Man_in_the_middle_debugger.Peer.name ~peer2:peer2.Man_in_the_middle_debugger.Peer.name log in let%map `Peer1 peer1_stopped, `Peer2 peer2_stopped = Man_in_the_middle_debugger.connect_peers_and_listen ~peer1 ~peer2 ~f:(function | `Peer_1_to_2 -> peer_1_to_2 | `Peer_2_to_1 -> peer_2_to_1) in let exit_status angstrom_exit_status ~from ~to_ = [%message [%string "%{from} -> %{to_}"] (angstrom_exit_status : (unit, string) Result.t)] in [%message "Connection closed." ~_:(exit_status peer1_stopped ~from:peer1.name ~to_:peer2.name : Sexp.t) ~_:(exit_status peer2_stopped ~from:peer2.name ~to_:peer1.name : Sexp.t)] |> Sexp.to_string_hum |> Out_channel.output_string log; Out_channel.output_char log '\n'; Out_channel.flush log ;; let connect_unix_peers_and_listen ?pp ?color ~client_name ~client_socket ~server_name ~server_socket () = let terminated = Ivar.create () in let%bind server = Tcp.Server.create ~on_handler_error:`Raise client_socket (* Act as a server to the client. *) (fun (_ : Socket.Address.Unix.t) client_reader client_writer -> let%bind (_ : _ Socket.t), server_reader, server_writer = Tcp.connect server_socket (* Act as a client to the server. *) in let%bind () = client_socket |> Tcp.Where_to_listen.address |> Socket.Address.Unix.to_string |> Unix.unlink in let%bind () = connect_peers_and_listen ?pp ?color ~peer1:{ name = client_name; reader = client_reader; writer = client_writer } ~peer2:{ name = server_name; reader = server_reader; writer = server_writer } ~log:stderr () in Ivar.fill terminated (); return ()) in let%bind () = Ivar.read terminated in Tcp.Server.close server ;; let connect_stdio_peers_and_listen ?pp ?color ~log ~parent_name ~child_name ~prog ~args () = let log = Out_channel.create log in let%bind child = Process.create_exn ~prog ~args () in let done_transferring_stderr = let child_reader = Process.stderr child in let parent_writer = force Writer.stderr in let parent_pipe = Writer.pipe parent_writer in let%bind () = Reader.transfer child_reader parent_pipe in let%bind () = Reader.close child_reader in let%bind (`Ok | `Reader_closed) = Pipe.upstream_flushed parent_pipe in Writer.close parent_writer in let%bind () = connect_peers_and_listen ?pp ?color ~peer1: { name = parent_name; reader = force Reader.stdin; writer = force Writer.stdout } ~peer2: { name = child_name; reader = Process.stdout child; writer = Process.stdin child } ~log () in let%bind () = done_transferring_stderr in let%bind exit_message = Process.wait child >>| Core_unix.Exit_or_signal.to_string_hum in Out_channel.output_string log [%string "%{child_name} %{exit_message}"]; Out_channel.close log; return () ;; let unix_domain_sockets_command ?pp () = Command.async ~behave_nicely_in_pipeline:true ~summary:"Capture Msgpack RPC traffic over unix domain sockets" ~readme:(fun () -> {| Each endpoint uses a different socket and the debugger ferries messages between them. The server program should be listening on [server-socket] and the client program should try connecting to [client-socket]. The debugger acts as a server to the client and a client to the server. First start the server program, then start this debugger specifying the [server-socket] where that server program is listening and a new [client-socket] where the debugger will start listening. Finally, start the client program and have it connect to [client-socket]. |}) (let%map_open.Command () = return () and client_name = flag "client-name" (required string) ~doc:"STRING Name to use for client in log" and client_socket = flag "client-socket" (required Filename_unix.arg_type) ~doc:"SOCKET Where the client will connect" >>| Tcp.Where_to_listen.of_file and server_name = flag "server-name" (required string) ~doc:"STRING Name to use for server in log" and server_socket = flag "server-socket" (required Filename_unix.arg_type) ~doc:"SOCKET Where the server is listening" >>| Tcp.Where_to_connect.of_file and color = let always_never = Command.Arg_type.of_alist_exn ~list_values_in_help:false [ "always", true; "never", false ] in flag "color" (optional always_never) ~doc:"(always|never) Color names in the log" in fun () -> let color = match color with | Some bool -> bool | None -> Core_unix.(isatty stderr) in connect_unix_peers_and_listen ?pp ~color ~client_name ~client_socket ~server_name ~server_socket ()) ;; let stdio_command ?pp () = Command.async ~behave_nicely_in_pipeline:true ~summary:"Capture Msgpack RPC traffic over stdio" ~readme:(fun () -> {| Run an embedded program that expects to communicate Msgpack RPC over stdio and write the communication to a file. Stderr from the child is passed through. |}) (let%map_open.Command () = return () and log = flag "log" (required Filename_unix.arg_type) ~doc:"FILENAME Where to log the communication" and parent_name = flag "parent-name" (required string) ~doc:"STRING Name to use for parent in log" and child_name = flag "child-name" (required string) ~doc:"STRING Name to use for child in log" and program = flag "--" escape ~doc:"PROG Child program to run" and color = flag "color" (optional_with_default false bool) ~doc:"BOOL Color names in the log (default: false)" in fun () -> match program with | None | Some [] -> failwith "Must provide an embedded program to run" | Some (prog :: args) -> connect_stdio_peers_and_listen ?pp ~color ~log ~parent_name ~child_name ~prog ~args ()) ;; let command ?pp () = Command.group ~summary:"Capture Msgpack RPC traffic" [ "stdio", stdio_command ?pp () ; "unix", unix_domain_sockets_command ?pp () ; "convert", Conversions.command ] ;;
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