118 lines
4.5 KiB
OCaml
118 lines
4.5 KiB
OCaml
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(*
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* Copyright (c) 2011-2015 Anil Madhavapeddy <anil@recoil.org>
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* Copyright (c) 2013-2015 Thomas Gazagnaire <thomas@gazagnaire.org>
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* Copyright (c) 2013 Citrix Systems Inc
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*)
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(** MirageOS signature for channel devices.
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Channels are buffered byte-streams which are attached to an
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unbuffered flow (e.g. a TCPv4 connection).
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{e Release v5.0.0 } *)
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module type S = sig
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type error
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(** The type for errors. *)
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val pp_error: error Fmt.t
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(** [pp_error] is the pretty-printer for errors. *)
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type write_error = private [> Mirage_flow.write_error]
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(** The type for write errors. *)
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val pp_write_error: write_error Fmt.t
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(** [pp_write_error] is the pretty-printer for write errors. *)
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type flow
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(** The type for unbuffered network flow. *)
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type t
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(** The type for the state associated with channels, such as the
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inflight buffers. *)
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val create: flow -> t
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(** [create flow] allocates send and receive buffers and
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associates them with the given unbuffered [flow]. *)
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val to_flow: t -> flow
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(** [to_flow t] returns the flow that backs this channel. *)
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val read_char: t -> (char Mirage_flow.or_eof, error) result Lwt.t
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(** Reads a single character from the channel, blocking if there is
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no immediately available input data. *)
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val read_some: ?len:int -> t -> (Cstruct.t Mirage_flow.or_eof, error) result Lwt.t
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(** [read_some ?len t] reads up to [len] characters from the
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input channel and at most a full [buffer]. If [len] is not
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specified, it reads all available data and returns that
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buffer. *)
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val read_exactly: len:int -> t -> (Cstruct.t list Mirage_flow.or_eof, error) result Lwt.t
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(** [read_exactly len t] reads [len] bytes from the channel [t] or fails
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with [Eof]. *)
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val read_line: ?len:int -> t -> (Cstruct.t list Mirage_flow.or_eof, error) result Lwt.t
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(** [read_line t] reads a line of input, which is terminated
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either by a CRLF sequence, or the end of the channel (which
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counts as a line).
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If [?len] is provided then the maximum length of the line returned will be
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[len] bytes. If the line is longer than [len] then an error will be
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returned. With [len = 0], [read_line] always returns an error.
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If the input data is untrusted then care should be taken to ensure [len]
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is set to an application-specific small value to bound the amount of
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memory allocated by [read_line].
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@return Returns a list of views that terminates at EOF. *)
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val write_char: t -> char -> unit
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(** [write_char t ch] writes a single character to the output
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channel. *)
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val write_string: t -> string -> int -> int -> unit
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(** [write_string t buf off len] writes [len] bytes from a string
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[buf], starting from from offset [off]. *)
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val write_buffer: t -> Cstruct.t -> unit
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(** [write_buffer t buf] copies the buffer to the channel's
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output buffer. The buffer should not be modified after being
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written, and it will be recycled into the buffer allocation pool
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at some future point. *)
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val write_line: t -> string -> unit
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(** [write_line t buf] writes the string [buf] to the output
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channel and append a newline character afterwards. *)
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val flush: t -> (unit, write_error) result Lwt.t
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(** [flush t] flushes the output buffer and block if necessary
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until it is all written out to the flow. *)
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val close: t -> (unit, write_error) result Lwt.t
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(** [close t] calls {!flush} and then close the underlying
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flow. *)
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val shutdown : t -> [ `read | `write | `read_write ] -> (unit, write_error) result Lwt.t
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(** [shutdown t mode] calls {!flush} and then shutdown on the underlying
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flow. *)
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end
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(** Functor to create a CHANNEL from a flow implementation *)
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module Make(F: Mirage_flow.S)
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: S with type flow = F.flow
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and type error = private [> `Read_zero | `Flow of F.error | `Line_too_long ]
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