mirror of https://github.com/nealey/irc-bot
116 lines
3.4 KiB
OCaml
116 lines
3.4 KiB
OCaml
(* **************************************
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* IRC Command I/O buffers
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* **************************************)
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type t = {d: Dispatch.t;
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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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addr: string;
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command_handler: (t -> Command.t -> unit) ref;
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close_handler: (string -> 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 addr iobuf = iobuf.addr
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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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Dispatch.modify iobuf.d iobuf.fd [Dispatch.Input; Dispatch.Output]
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let close iobuf message =
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!(iobuf.close_handler) message;
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Dispatch.delete iobuf.d iobuf.fd;
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Unix.close iobuf.fd
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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 rec handle_events iobuf fd events =
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match events with
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| [] ->
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()
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| Dispatch.Input :: tl ->
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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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iobuf.ibuf_len := !(iobuf.ibuf_len) + len;
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handle_input iobuf;
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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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close iobuf "Input buffer overrun"
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else
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handle_events iobuf fd tl
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| Dispatch.Output :: tl ->
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(* XXX: Could be optimized to try and fill the output buffer *)
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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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Dispatch.modify iobuf.d fd [Dispatch.Input];
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handle_events iobuf fd tl
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| Dispatch.Priority :: tl ->
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let s = String.create 4096 in
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ignore (Unix.recv fd s 0 4096 [Unix.MSG_OOB]);
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handle_events iobuf fd tl
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| Dispatch.Error :: tl ->
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close iobuf "Error"
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| Dispatch.Hangup :: tl ->
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close iobuf "Hangup"
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let bind d 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 addr =
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match Unix.getpeername fd with
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| Unix.ADDR_UNIX s ->
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"UDS"
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| Unix.ADDR_INET (addr, port) ->
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Unix.string_of_inet_addr addr
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in
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let iobuf = {d = d;
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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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addr = addr;
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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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Dispatch.add d fd (handle_events iobuf) [Dispatch.Input]
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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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