Split the file into more readable-sized files
This commit is contained in:
eichhornchen
428
squinnondation/hazel.py
Normal file
428
squinnondation/hazel.py
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# Copyright (C) 2020 by eichhornchen, ÿnérant
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# SPDX-License-Identifier: GPL-3.0-or-later
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from typing import Any, List, Optional, Tuple
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from ipaddress import IPv6Address
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from enum import Enum
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from messages import Packet, TLV, HelloTLV, NeighbourTLV, Pad1TLV, PadNTLV, DataTLV, AckTLV, GoAwayTLV, WarningTLV
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from threading import Thread
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class Hazelnut:
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"""
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A hazelnut is a connected client, with its socket.
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"""
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def __init__(self, nickname: str = "anonymous", address: str = "localhost", port: int = 2500):
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self.nickname = nickname
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try:
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# Resolve DNS as an IPv6
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address = socket.getaddrinfo(address, None, socket.AF_INET6)[0][4][0]
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except socket.gaierror:
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# This is not a valid IPv6. Assume it can be resolved as an IPv4, and we use IPv4-mapping
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# to compute a valid IPv6.
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# See https://fr.wikipedia.org/wiki/Adresse_IPv6_mappant_IPv4
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address = "::ffff:" + socket.getaddrinfo(address, None, socket.AF_INET)[0][4][0]
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self.address = IPv6Address(address)
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self.port = port
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class Squirrel(Hazelnut):
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"""
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The squirrel is the user of the program. It can speak with other clients, that are called hazelnuts.
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"""
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def __init__(self, instance: Any, nickname: str):
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super().__init__(nickname, instance.bind_address, instance.bind_port)
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# Create UDP socket
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self.socket = socket.socket(socket.AF_INET6, socket.SOCK_DGRAM)
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# Bind the socket
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self.socket.bind((str(self.address), self.port))
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self.squinnondation = instance
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self.input_buffer = ""
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self.input_index = 0
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self.last_line = -1
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self.history = []
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self.history_pad = curses.newpad(curses.LINES - 2, curses.COLS)
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self.input_pad = curses.newpad(1, curses.COLS)
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self.emoji_pad = curses.newpad(18, 12)
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self.emoji_panel_page = -1
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curses.init_color(curses.COLOR_WHITE, 1000, 1000, 1000)
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for i in range(curses.COLOR_BLACK + 1, curses.COLOR_WHITE):
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curses.init_pair(i + 1, i, curses.COLOR_BLACK)
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self.hazelnuts = dict()
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self.add_system_message(f"Listening on {self.address}:{self.port}")
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def find_hazelnut(self, address: str, port: int) -> Hazelnut:
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"""
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Translate an address into a hazelnut, and store it in the list of the hazelnuts, ie. the neighbours.
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"""
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if (address, port) in self.hazelnuts:
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return self.hazelnuts[(address, port)]
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hazelnut = Hazelnut(address=address, port=port)
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self.hazelnuts[(address, port)] = hazelnut
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return hazelnut
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def send_packet(self, client: Hazelnut, pkt: Packet) -> int:
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"""
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Send a formatted packet to a client.
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"""
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return self.send_raw_data(client, pkt.marshal())
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def send_raw_data(self, client: Hazelnut, data: bytes) -> int:
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"""
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Send a raw packet to a client.
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"""
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return self.socket.sendto(data, (str(client.address), client.port))
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def receive_packet(self) -> Tuple[Packet, Hazelnut]:
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"""
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Receive a packet from the socket and translate it into a Python object.
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Warning: the process is blocking, it should be ran inside a dedicated thread.
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"""
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data, addr = self.receive_raw_data()
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return Packet.unmarshal(data), self.find_hazelnut(addr[0], addr[1])
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def receive_raw_data(self) -> Tuple[bytes, Any]:
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"""
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Receive a packet from the socket.
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"""
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return self.socket.recvfrom(1024)
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def wait_for_key(self) -> None:
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"""
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Infinite loop where we are waiting for a key of the user.
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"""
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while True:
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self.refresh_history()
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self.refresh_input()
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if not self.squinnondation.no_emoji:
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self.refresh_emoji_pad()
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key = self.squinnondation.screen.getkey(curses.LINES - 1, 3 + len(self.nickname) + self.input_index)
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if key == "KEY_MOUSE":
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try:
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_, x, y, _, attr = curses.getmouse()
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self.handle_mouse_click(y, x, attr)
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continue
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except curses.error:
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# This is not a valid click
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continue
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self.handle_key_pressed(key)
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def handle_key_pressed(self, key: str) -> None:
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"""
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Process the key press from the user.
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"""
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if key == "\x7f": # backspace
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# delete character at the good position
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if self.input_index:
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self.input_index -= 1
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self.input_buffer = self.input_buffer[:self.input_index] + self.input_buffer[self.input_index + 1:]
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return
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elif key == "KEY_LEFT":
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# Navigate in the message to the left
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self.input_index = max(0, self.input_index - 1)
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return
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elif key == "KEY_RIGHT":
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# Navigate in the message to the right
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self.input_index = min(len(self.input_buffer), self.input_index + 1)
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return
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elif key == "KEY_UP":
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# Scroll up in the history
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self.last_line = min(max(curses.LINES - 3, self.last_line - 1), len(self.history) - 1)
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return
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elif key == "KEY_DOWN":
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# Scroll down in the history
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self.last_line = min(len(self.history) - 1, self.last_line + 1)
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return
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elif key == "KEY_PPAGE":
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# Page up in the history
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self.last_line = min(max(curses.LINES - 3, self.last_line - (curses.LINES - 3)), len(self.history) - 1)
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return
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elif key == "KEY_NPAGE":
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# Page down in the history
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self.last_line = min(len(self.history) - 1, self.last_line + (curses.LINES - 3))
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return
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elif key == "KEY_HOME":
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# Place the cursor at the beginning of the typing word
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self.input_index = 0
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return
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elif key == "KEY_END":
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# Place the cursor at the end of the typing word
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self.input_index = len(self.input_buffer)
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return
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elif len(key) > 1:
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# Unmanaged complex key
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return
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elif key != "\n":
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# Insert the pressed key in the current message
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self.input_buffer = self.input_buffer[:self.input_index] + key + self.input_buffer[self.input_index:]
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self.input_index += 1
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return
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# Send message to neighbours
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msg = self.input_buffer
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self.input_buffer = ""
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self.input_index = 0
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if not msg:
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return
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msg = f"<{self.nickname}> {msg}"
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self.add_message(msg)
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pkt = Packet.construct(DataTLV.construct(msg))
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for hazelnut in list(self.hazelnuts.values()):
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self.send_packet(hazelnut, pkt)
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def handle_mouse_click(self, y: int, x: int, attr: int) -> None:
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"""
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The user clicks on the screen, at coordinates (y, x).
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According to the position, we can indicate what can be done.
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"""
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if not self.squinnondation.no_emoji:
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if y == curses.LINES - 1 and x >= curses.COLS - 3:
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# Click on the emoji, open or close the emoji pad
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self.emoji_panel_page *= -1
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elif self.emoji_panel_page > 0 and y == curses.LINES - 4 and x >= curses.COLS - 5:
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# Open next emoji page
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self.emoji_panel_page += 1
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elif self.emoji_panel_page > 1 and y == curses.LINES - curses.LINES // 2 - 1 \
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and x >= curses.COLS - 5:
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# Open previous emoji page
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self.emoji_panel_page -= 1
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elif self.emoji_panel_page > 0 and y >= curses.LINES // 2 - 1 and x >= curses.COLS // 2 - 1:
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pad_y, pad_x = y - (curses.LINES - curses.LINES // 2) + 1, \
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(x - (curses.COLS - curses.COLS // 3) + 1) // 2
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# Click on an emoji on the pad to autocomplete an emoji
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self.click_on_emoji_pad(pad_y, pad_x)
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def click_on_emoji_pad(self, pad_y: int, pad_x: int) -> None:
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"""
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The emoji pad contains the list of all available emojis.
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Clicking on a emoji auto-complete the emoji in the input pad.
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"""
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import emoji
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from emoji import unicode_codes
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height, width = self.emoji_pad.getmaxyx()
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height -= 1
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width -= 1
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emojis = list(unicode_codes.UNICODE_EMOJI)
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emojis = [c for c in emojis if len(c) == 1]
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size = (height - 2) * (width - 4) // 2
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page = emojis[(self.emoji_panel_page - 1) * size:self.emoji_panel_page * size]
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index = pad_y * (width - 4) // 2 + pad_x
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char = page[index]
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if char:
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demojized = emoji.demojize(char)
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if char != demojized:
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for c in reversed(demojized):
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curses.ungetch(c)
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def add_message(self, msg: str) -> None:
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"""
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Store a new message into the history.
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"""
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self.history.append(msg)
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if self.last_line == len(self.history) - 2:
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self.last_line += 1
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def add_system_message(self, msg: str) -> None:
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"""
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Add a new system log message.
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TODO: Configure logging levels to ignore some messages.
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"""
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return self.add_message(f"<system> *{msg}*")
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def print_markdown(self, pad: Any, y: int, x: int, msg: str,
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bold: bool = False, italic: bool = False, underline: bool = False, strike: bool = False) -> int:
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"""
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Parse a markdown-formatted text and format the text as bold, italic or text text.
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***text***: bold, italic
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**text**: bold
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*text*: italic
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__text__: underline
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_text_: italic
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~~text~~: strikethrough
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"""
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# Replace :emoji_name: by the good emoji
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if not self.squinnondation.no_emoji:
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import emoji
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msg = emoji.emojize(msg, use_aliases=True)
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if self.squinnondation.no_markdown:
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pad.addstr(y, x, msg)
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return len(msg)
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underline_match = re.match("(.*)__(.*)__(.*)", msg)
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if underline_match:
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before, text, after = underline_match.group(1), underline_match.group(2), underline_match.group(3)
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len_before = self.print_markdown(pad, y, x, before, bold, italic, underline)
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len_mid = self.print_markdown(pad, y, x + len_before, text, bold, italic, not underline)
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len_after = self.print_markdown(pad, y, x + len_before + len_mid, after, bold, italic, underline)
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return len_before + len_mid + len_after
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italic_match = re.match("(.*)_(.*)_(.*)", msg)
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if italic_match:
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before, text, after = italic_match.group(1), italic_match.group(2), italic_match.group(3)
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len_before = self.print_markdown(pad, y, x, before, bold, italic, underline)
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len_mid = self.print_markdown(pad, y, x + len_before, text, bold, not italic, underline)
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len_after = self.print_markdown(pad, y, x + len_before + len_mid, after, bold, italic, underline)
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return len_before + len_mid + len_after
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bold_italic_match = re.match("(.*)\\*\\*\\*(.*)\\*\\*\\*(.*)", msg)
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if bold_italic_match:
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before, text, after = bold_italic_match.group(1), bold_italic_match.group(2),\
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bold_italic_match.group(3)
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len_before = self.print_markdown(pad, y, x, before, bold, italic, underline, strike)
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len_mid = self.print_markdown(pad, y, x + len_before, text, not bold, not italic, underline, strike)
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len_after = self.print_markdown(pad, y, x + len_before + len_mid, after, bold, italic, underline, strike)
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return len_before + len_mid + len_after
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bold_match = re.match("(.*)\\*\\*(.*)\\*\\*(.*)", msg)
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if bold_match:
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before, text, after = bold_match.group(1), bold_match.group(2), bold_match.group(3)
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len_before = self.print_markdown(pad, y, x, before, bold, italic, underline, strike)
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len_mid = self.print_markdown(pad, y, x + len_before, text, not bold, italic, underline, strike)
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len_after = self.print_markdown(pad, y, x + len_before + len_mid, after, bold, italic, underline, strike)
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return len_before + len_mid + len_after
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italic_match = re.match("(.*)\\*(.*)\\*(.*)", msg)
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if italic_match:
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before, text, after = italic_match.group(1), italic_match.group(2), italic_match.group(3)
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len_before = self.print_markdown(pad, y, x, before, bold, italic, underline, strike)
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len_mid = self.print_markdown(pad, y, x + len_before, text, bold, not italic, underline, strike)
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len_after = self.print_markdown(pad, y, x + len_before + len_mid, after, bold, italic, underline, strike)
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return len_before + len_mid + len_after
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strike_match = re.match("(.*)~~(.*)~~(.*)", msg)
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if strike_match:
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before, text, after = strike_match.group(1), strike_match.group(2), strike_match.group(3)
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len_before = self.print_markdown(pad, y, x, before, bold, italic, underline, strike)
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len_mid = self.print_markdown(pad, y, x + len_before, text, bold, italic, underline, not strike)
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len_after = self.print_markdown(pad, y, x + len_before + len_mid, after, bold, italic, underline, strike)
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return len_before + len_mid + len_after
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size = len(msg)
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attrs = 0
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attrs |= curses.A_BOLD if bold else 0
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attrs |= curses.A_ITALIC if italic else 0
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attrs |= curses.A_UNDERLINE if underline else 0
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if strike:
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msg = "".join(c + "\u0336" for c in msg)
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pad.addstr(y, x, msg, attrs)
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return size
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def refresh_history(self) -> None:
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"""
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Rewrite the history of the messages.
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"""
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y, x = self.squinnondation.screen.getmaxyx()
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if curses.is_term_resized(curses.LINES, curses.COLS):
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curses.resizeterm(y, x)
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self.history_pad.resize(curses.LINES - 2, curses.COLS - 1)
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self.input_pad.resize(1, curses.COLS - 1)
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self.history_pad.erase()
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for i, msg in enumerate(self.history[max(0, self.last_line - curses.LINES + 3):self.last_line + 1]):
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if not re.match("<.*> .*", msg):
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msg = "<unknown> " + msg
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match = re.match("<(.*)> (.*)", msg)
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nickname = match.group(1)
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msg = match.group(2)
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color_id = sum(ord(c) for c in nickname) % 6 + 1
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self.history_pad.addstr(i, 0, "<")
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self.history_pad.addstr(i, 1, nickname, curses.A_BOLD | curses.color_pair(color_id + 1))
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self.history_pad.addstr(i, 1 + len(nickname), "> ")
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self.print_markdown(self.history_pad, i, 3 + len(nickname), msg)
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self.history_pad.refresh(0, 0, 0, 0, curses.LINES - 2, curses.COLS)
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def refresh_input(self) -> None:
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"""
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Redraw input line. Must not be called while the message is not sent.
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"""
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self.input_pad.erase()
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color_id = sum(ord(c) for c in self.nickname) % 6 + 1
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self.input_pad.addstr(0, 0, "<")
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self.input_pad.addstr(0, 1, self.nickname, curses.A_BOLD | curses.color_pair(color_id + 1))
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self.input_pad.addstr(0, 1 + len(self.nickname), "> ")
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msg = self.input_buffer
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if len(msg) + len(self.nickname) + 3 >= curses.COLS:
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msg = ""
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self.input_pad.addstr(0, 3 + len(self.nickname), self.input_buffer)
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if not self.squinnondation.no_emoji:
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self.input_pad.addstr(0, self.input_pad.getmaxyx()[1] - 3, "😀")
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self.input_pad.refresh(0, 0, curses.LINES - 1, 0, curses.LINES - 1, curses.COLS - 1)
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def refresh_emoji_pad(self) -> None:
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"""
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Display the emoji pad if necessary.
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"""
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if self.squinnondation.no_emoji:
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return
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from emoji import unicode_codes
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self.emoji_pad.erase()
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if self.emoji_panel_page > 0:
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height, width = curses.LINES // 2, curses.COLS // 3
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self.emoji_pad.resize(height + 1, width + 1)
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self.emoji_pad.addstr(0, 0, "┏" + (width - 2) * "━" + "┓")
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self.emoji_pad.addstr(0, (width - 14) // 2, " == EMOJIS == ")
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for i in range(1, height):
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self.emoji_pad.addstr(i, 0, "┃" + (width - 2) * " " + "┃")
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self.emoji_pad.addstr(height - 1, 0, "┗" + (width - 2) * "━" + "┛")
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emojis = list(unicode_codes.UNICODE_EMOJI)
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emojis = [c for c in emojis if len(c) == 1]
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size = (height - 2) * (width - 4) // 2
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page = emojis[(self.emoji_panel_page - 1) * size:self.emoji_panel_page * size]
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|
||||
if self.emoji_panel_page != 1:
|
||||
self.emoji_pad.addstr(1, width - 2, "⬆")
|
||||
if len(page) == size:
|
||||
self.emoji_pad.addstr(height - 2, width - 2, "⬇")
|
||||
|
||||
for i in range(height - 2):
|
||||
for j in range((width - 4) // 2 + 1):
|
||||
index = i * (width - 4) // 2 + j
|
||||
if index < len(page):
|
||||
self.emoji_pad.addstr(i + 1, 2 * j + 1, page[index])
|
||||
|
||||
self.emoji_pad.refresh(0, 0, curses.LINES - height - 2, curses.COLS - width - 2,
|
||||
curses.LINES - 2, curses.COLS - 2)
|
||||
|
||||
|
||||
class Worm(Thread):
|
||||
"""
|
||||
The worm is the hazel listener.
|
||||
It always waits for an incoming packet, then it treats it, and continues to wait.
|
||||
It is in a dedicated thread.
|
||||
"""
|
||||
def __init__(self, squirrel: Squirrel, *args, **kwargs):
|
||||
super().__init__(*args, **kwargs)
|
||||
self.squirrel = squirrel
|
||||
|
||||
def run(self) -> None:
|
||||
while True:
|
||||
try:
|
||||
pkt, hazelnut = self.squirrel.receive_packet()
|
||||
pkt.validate_data()
|
||||
except ValueError as error:
|
||||
self.squirrel.add_system_message("An error occurred while receiving a packet: {}".format(error))
|
||||
else:
|
||||
for tlv in pkt.body:
|
||||
tlv.handle(self.squirrel, hazelnut)
|
||||
self.squirrel.refresh_history()
|
||||
self.squirrel.refresh_input()
|
||||
Reference in New Issue
Block a user