mirror of https://github.com/nealey/irc-bot
127 lines
3.9 KiB
OCaml
127 lines
3.9 KiB
OCaml
(* ==========================================
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* I/O buf stuff
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*)
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type t = {ues: Unixqueue.event_system;
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grp: Unixqueue.group;
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fd: Unix.file_descr;
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outq: Command.t Queue.t;
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unsent: string ref;
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ibuf: string;
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ibuf_len: int ref;
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command_handler: (t -> Command.t -> unit) ref;
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close_handler: (unit -> unit) ref}
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let ibuf_max = 4096
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let max_outq = 50
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let obuf_max = 4096
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let by_file_descr = Hashtbl.create 25
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let write iobuf cmd =
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let was_empty = Queue.is_empty iobuf.outq in
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Queue.add cmd iobuf.outq;
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if (was_empty && (!(iobuf.unsent) = "")) then
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Unixqueue.add_resource
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iobuf.ues iobuf.grp (Unixqueue.Wait_out iobuf.fd, -.1.0)
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let close iobuf =
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!(iobuf.close_handler) ();
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Hashtbl.remove by_file_descr iobuf.fd;
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Unix.close iobuf.fd;
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Unixqueue.remove_resource iobuf.ues iobuf.grp (Unixqueue.Wait_in iobuf.fd);
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try
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Unixqueue.remove_resource iobuf.ues iobuf.grp (Unixqueue.Wait_out iobuf.fd);
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with Not_found ->
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()
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let handle_close fd =
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try
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let iobuf = Hashtbl.find by_file_descr fd in
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close iobuf
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with Not_found ->
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()
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let crlf = Str.regexp "\r?\n"
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let handle_input iobuf =
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let buf = Str.string_before iobuf.ibuf !(iobuf.ibuf_len) in
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let lines = Str.split_delim crlf buf in
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let rec loop l =
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match l with
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| [] ->
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()
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| [leftover] ->
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iobuf.ibuf_len := (String.length leftover);
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String.blit leftover 0 iobuf.ibuf 0 !(iobuf.ibuf_len)
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| line :: tl ->
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let parsed = Command.from_string line in
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!(iobuf.command_handler) iobuf parsed;
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loop tl
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in
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loop lines
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let handle_event ues esys e =
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match e with
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| Unixqueue.Input_arrived (g, fd) ->
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let iobuf = Hashtbl.find by_file_descr fd in
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let size = ibuf_max - !(iobuf.ibuf_len) in
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let len = Unix.read fd iobuf.ibuf !(iobuf.ibuf_len) size in
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if (len > 0) then
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begin
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iobuf.ibuf_len := !(iobuf.ibuf_len) + len;
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try
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handle_input iobuf
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with Not_found ->
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if (!(iobuf.ibuf_len) = ibuf_max) then
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(* No newline found, and the buffer is full *)
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raise (Failure "Buffer overrun");
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end
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else
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close iobuf
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| Unixqueue.Output_readiness (g, fd) ->
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(* XXX: Could be optimized to try and fill the output buffer *)
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let iobuf = Hashtbl.find by_file_descr fd in
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let buf =
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if (!(iobuf.unsent) = "") then
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let cmd = Queue.pop iobuf.outq in
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(Command.as_string cmd) ^ "\r\n"
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else
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!(iobuf.unsent)
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in
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let buflen = String.length buf in
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let n = Unix.single_write fd buf 0 buflen in
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if n < buflen then
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iobuf.unsent := Str.string_after buf n
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else if Queue.is_empty iobuf.outq then
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Unixqueue.remove_resource ues g (Unixqueue.Wait_out fd)
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| Unixqueue.Out_of_band (g, fd) ->
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print_endline "oob"
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| Unixqueue.Timeout (g, op) ->
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print_endline "timeout"
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| Unixqueue.Signal ->
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print_endline "signal"
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| Unixqueue.Extra exn ->
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print_endline "extra"
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let bind ues grp fd command_handler close_handler =
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let (outq, unsent, ibuf, ibuf_len) =
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(Queue.create (), ref "", String.create ibuf_max, ref 0)
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in
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let iobuf = {ues = ues;
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grp = grp;
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fd = fd;
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outq = outq;
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unsent = unsent;
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ibuf = ibuf;
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ibuf_len = ibuf_len;
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command_handler = ref command_handler;
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close_handler = ref close_handler}
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in
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Hashtbl.replace by_file_descr fd iobuf;
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Unixqueue.add_resource ues grp (Unixqueue.Wait_in fd, -.1.0);
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Unixqueue.add_close_action ues grp (fd, handle_close)
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let rebind t command_handler close_handler =
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t.command_handler := command_handler;
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t.close_handler := close_handler
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