82857dcb94
- `lib_node_p2p_base`: Base datatypes for the P2P layers - `lib_node_services`: RPC service definitions (depends on `node_p2p_base`) - `lib_node_http`: RPC http server - `lib_node_p2p`: the P2P workers
94 lines
3.7 KiB
OCaml
94 lines
3.7 KiB
OCaml
(**************************************************************************)
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(* *)
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(* Copyright (c) 2014 - 2017. *)
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(* Dynamic Ledger Solutions, Inc. <contact@tezos.com> *)
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(* *)
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(* All rights reserved. No warranty, explicit or implicit, provided. *)
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(* *)
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(**************************************************************************)
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(** IO Scheduling. This module implements generic IO scheduling
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between file descriptors. In order to use IO scheduling, the
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[register] function must be used to make a file descriptor managed
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by a [scheduler].. It will return a value of type [connection]
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that must be used to perform IO on the managed file descriptor
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using this module's dedicated IO functions (read, write, etc.).
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Each connection is allowed a read (resp. write) quota, which is
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for now fairly distributed among connections.
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To each connection is associated a read (resp. write) queue where
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data is copied to (resp. read from), at a rate of
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max_download_speed / num_connections (resp. max_upload_speed /
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num_connections).
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*)
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open P2p_types
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type connection
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(** Type of a connection. *)
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type t
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(** Type of an IO scheduler. *)
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val create:
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?max_upload_speed:int ->
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?max_download_speed:int ->
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?read_queue_size:int ->
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?write_queue_size:int ->
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read_buffer_size:int ->
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unit -> t
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(** [create ~max_upload_speed ~max_download_speed ~read_queue_size
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~write_queue_size ()] is an IO scheduler with specified (global)
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max upload (resp. download) speed, and specified read
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(resp. write) queue sizes (in bytes) for connections. *)
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val register: t -> Lwt_unix.file_descr -> connection
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(** [register sched fd] is a [connection] managed by [sched]. *)
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type error += Connection_closed
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val write: connection -> MBytes.t -> unit tzresult Lwt.t
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(** [write conn msg] returns [Ok ()] when [msg] has been added to
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[conn]'s write queue, or fail with an error. *)
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val write_now: connection -> MBytes.t -> bool
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(** [write_now conn msg] is [true] iff [msg] has been (immediately)
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added to [conn]'s write queue, [false] if it has been dropped. *)
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val read_now:
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connection -> ?pos:int -> ?len:int -> MBytes.t -> int tzresult option
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(** [read_now conn ~pos ~len buf] blits at most [len] bytes from
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[conn]'s read queue and returns the number of bytes written in
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[buf] starting at [pos]. *)
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val read:
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connection -> ?pos:int -> ?len:int -> MBytes.t -> int tzresult Lwt.t
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(** Like [read_now], but waits till [conn] read queue has at least one
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element instead of failing. *)
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val read_full:
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connection -> ?pos:int -> ?len:int -> MBytes.t -> unit tzresult Lwt.t
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(** Like [read], but blits exactly [len] bytes in [buf]. *)
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val stat: connection -> Stat.t
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(** [stat conn] is a snapshot of current bandwidth usage for
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[conn]. *)
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val global_stat: t -> Stat.t
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(** [global_stat sched] is a snapshot of [sched]'s bandwidth usage
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(sum of [stat conn] for each [conn] in [sched]). *)
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val iter_connection: t -> (int -> connection -> unit) -> unit
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(** [iter_connection sched f] applies [f] on each connection managed
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by [sched]. *)
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val close: ?timeout:float -> connection -> unit tzresult Lwt.t
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(** [close conn] cancels [conn] and returns after any pending data has
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been sent. *)
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val shutdown: ?timeout:float -> t -> unit Lwt.t
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(** [shutdown sched] returns after all connections managed by [sched]
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have been closed and [sched]'s inner worker has successfully
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canceled. *)
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