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Fix up documentation for building
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@ -1,3 +1,25 @@
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# MIT License
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#
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# Copyright (c) 2016-2023 Mark Qvist / unsigned.io and contributors.
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#
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# Permission is hereby granted, free of charge, to any person obtaining a copy
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# of this software and associated documentation files (the "Software"), to deal
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# in the Software without restriction, including without limitation the rights
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# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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# copies of the Software, and to permit persons to whom the Software is
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# furnished to do so, subject to the following conditions:
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#
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# The above copyright notice and this permission notice shall be included in all
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# copies or substantial portions of the Software.
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#
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# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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# SOFTWARE.
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from __future__ import annotations
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import collections
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import enum
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@ -105,17 +127,23 @@ class MessageBase(abc.ABC):
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"""
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Base type for any messages sent or received on a Channel.
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Subclasses must define the two abstract methods as well as
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the MSGTYPE class variable.
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the ``MSGTYPE`` class variable.
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"""
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# MSGTYPE must be unique within all classes sent over a
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# channel. Additionally, MSGTYPE > 0xf000 are reserved.
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MSGTYPE = None
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"""
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Defines a unique identifier for a message class.
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``MSGTYPE`` must be unique within all classes sent over a channel.
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``MSGTYPE`` must be < ``0xf000``. Values >= ``0xf000`` are reserved.
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"""
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@abstractmethod
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def pack(self) -> bytes:
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"""
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Create and return the binary representation of the message
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@return: binary representation of message
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:return: binary representation of message
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"""
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raise NotImplemented()
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@ -123,7 +151,8 @@ class MessageBase(abc.ABC):
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def unpack(self, raw):
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"""
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Populate message from binary representation
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@param raw: binary representation
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:param raw: binary representation
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"""
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raise NotImplemented()
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@ -168,11 +197,19 @@ class Envelope:
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class Channel(contextlib.AbstractContextManager):
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"""
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Channel provides reliable delivery of messages over
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a link. Channel is not meant to be instantiated
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a link.
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Channel is not meant to be instantiated
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directly, but rather obtained from a Link using the
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get_channel() function.
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:param outlet: Outlet object to use for transport
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"""
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def __init__(self, outlet: ChannelOutletBase):
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"""
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@param outlet:
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"""
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self._outlet = outlet
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self._lock = threading.RLock()
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self._tx_ring: collections.deque[Envelope] = collections.deque()
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@ -193,7 +230,8 @@ class Channel(contextlib.AbstractContextManager):
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def register_message_type(self, message_class: Type[MessageBase], *, is_system_type: bool = False):
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"""
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Register a message class for reception over a channel.
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@param message_class: Class to register. Must extend MessageBase.
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:param message_class: Class to register. Must extend MessageBase.
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"""
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with self._lock:
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if not issubclass(message_class, MessageBase):
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@ -216,13 +254,13 @@ class Channel(contextlib.AbstractContextManager):
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def add_message_handler(self, callback: MessageCallbackType):
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"""
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Add a handler for incoming messages. A handler
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has the signature (message: MessageBase) -> bool.
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has the signature ``(message: MessageBase) -> bool``.
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Handlers are processed in the order they are
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added. If any handler returns True, processing
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of the message stops; handlers after the
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returning handler will not be called.
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@param callback: Function to call
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@return:
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:param callback: Function to call
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"""
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with self._lock:
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if callback not in self._message_callbacks:
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@ -231,7 +269,8 @@ class Channel(contextlib.AbstractContextManager):
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def remove_message_handler(self, callback: MessageCallbackType):
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"""
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Remove a handler
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@param callback: handler to remove
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:param callback: handler to remove
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"""
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with self._lock:
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self._message_callbacks.remove(callback)
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@ -303,7 +342,8 @@ class Channel(contextlib.AbstractContextManager):
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def is_ready_to_send(self) -> bool:
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"""
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Check if Channel is ready to send.
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@return: True if ready
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:return: True if ready
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"""
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if not self._outlet.is_usable:
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RNS.log("Channel: Link is not usable.", RNS.LOG_EXTREME)
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@ -350,7 +390,8 @@ class Channel(contextlib.AbstractContextManager):
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"""
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Send a message. If a message send is attempted and
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Channel is not ready, an exception is thrown.
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@param message: an instance of a MessageBase subclass to send on the Channel
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:param message: an instance of a MessageBase subclass to send on the Channel
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"""
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envelope: Envelope | None = None
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with self._lock:
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@ -376,7 +417,8 @@ class Channel(contextlib.AbstractContextManager):
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"""
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Maximum Data Unit: the number of bytes available
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for a message to consume in a single send.
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@return: number of bytes available
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:return: number of bytes available
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"""
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return self._outlet.mdu - 6 # sizeof(msgtype) + sizeof(length) + sizeof(sequence)
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@ -386,6 +428,8 @@ class LinkChannelOutlet(ChannelOutletBase):
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An implementation of ChannelOutletBase for RNS.Link.
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Allows Channel to send packets over an RNS Link with
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Packets.
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:param link: RNS Link to wrap
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"""
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def __init__(self, link: RNS.Link):
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self.link = link
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@ -646,6 +646,11 @@ class Link:
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pending_request.request_timed_out(None)
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def get_channel(self):
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"""
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Get the ``Channel`` for this link.
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:return: ``Channel`` object
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"""
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if self._channel is None:
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self._channel = Channel(LinkChannelOutlet(self))
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return self._channel
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@ -121,6 +121,34 @@ This chapter lists and explains all classes exposed by the Reticulum Network Sta
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.. autoclass:: RNS.Resource(data, link, advertise=True, auto_compress=True, callback=None, progress_callback=None, timeout=None)
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:members:
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.. _api-channel:
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.. only:: html
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|start-h3| Channel |end-h3|
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.. only:: latex
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Channel
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------
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.. autoclass:: RNS.Channel.Channel(outlet)
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:members:
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.. _api-messsagebase:
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.. only:: html
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|start-h3| MessageBase |end-h3|
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.. only:: latex
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MessageBase
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------
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.. autoclass:: RNS.MessageBase()
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:members:
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.. _api-transport:
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.. only:: html
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