mirror of https://github.com/nealey/irc-bot
114 lines
3.7 KiB
OCaml
114 lines
3.7 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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name: string;
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handle_command: command_handler ref;
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handle_error: error_handler ref;
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alive: bool ref}
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and command_handler = t -> Command.t -> unit
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and error_handler = t -> string -> unit
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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 name iobuf = iobuf.name
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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.handle_command) iobuf parsed;
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loop tl
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in
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loop lines
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let close iobuf message =
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!(iobuf.handle_error) iobuf message;
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iobuf.alive := false;
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Dispatch.modify iobuf.d iobuf.fd [Dispatch.Input; Dispatch.Output]
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let write iobuf cmd =
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match Queue.length iobuf.outq with
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| a when a = max_outq ->
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close iobuf "Max outq exceeded"
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| len ->
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Queue.add cmd iobuf.outq;
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if ((len = 0) && (!(iobuf.unsent) = "")) then
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Dispatch.modify iobuf.d iobuf.fd [Dispatch.Input; Dispatch.Output]
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let handle_event iobuf fd event =
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match event with
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| Dispatch.Input ->
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let size = ibuf_max - !(iobuf.ibuf_len) in
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(match Unix.read fd iobuf.ibuf !(iobuf.ibuf_len) size with
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| 0 ->
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close iobuf "Hangup"
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| len ->
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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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| Dispatch.Output ->
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let buf = Buffer.create obuf_max in
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Buffer.add_string buf !(iobuf.unsent);
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while (((Buffer.length buf) < obuf_max) &&
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(not (Queue.is_empty iobuf.outq))) do
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let cmd = Queue.pop iobuf.outq in
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Buffer.add_string buf (Command.as_string cmd);
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Buffer.add_string buf "\r\n"
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done;
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let bufstr = Buffer.contents buf in
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let buflen = Buffer.length buf in
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let n = Unix.single_write fd bufstr 0 buflen in
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if n < buflen then begin
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iobuf.unsent := Str.string_after bufstr n;
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end else if Queue.is_empty iobuf.outq then
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if !(iobuf.alive) then begin
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(* We're out of data to send *)
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Dispatch.modify iobuf.d fd [Dispatch.Input];
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end else begin
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(* Close dead connection after all output has despooled *)
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Dispatch.delete iobuf.d iobuf.fd;
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Unix.close iobuf.fd
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end
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| Dispatch.Exception ->
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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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let bind iobuf handle_command handle_error =
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iobuf.handle_command := handle_command;
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iobuf.handle_error := handle_error
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let create d fd name handle_command handle_error =
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let iobuf = {d = d;
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fd = fd;
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outq = Queue.create ();
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unsent = ref "";
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ibuf = String.create ibuf_max;
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ibuf_len = ref 0;
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name = name;
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handle_command = ref handle_command;
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handle_error = ref handle_error;
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alive = ref true} in
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Dispatch.add d fd (handle_event iobuf) [Dispatch.Input];
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iobuf
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