forked from Firepup650/python-talk
635 lines
28 KiB
Python
Executable file
635 lines
28 KiB
Python
Executable file
#!/usr/bin/python3
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import os, sys, asyncio, re, signal
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from platform import uname
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from traceback import format_exc
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from logs import log
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class LinkDownError(Exception): ...
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class FailedLinkError(Exception): ...
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class Globals: ...
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TimeoutErrors = (TimeoutError, asyncio.exceptions.TimeoutError)
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DisconnectErrors = (ConnectionResetError, BrokenPipeError, IndexError, *TimeoutErrors)
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G = Globals()
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G.uniqueClients = 0
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G.servers = {}
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G.clientsConnected = {}
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port = 65048
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G.msgs = []
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G.remoteID = uname().node
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G.event = asyncio.Event()
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G.loop = asyncio.get_event_loop()
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G.interruptCount = 0
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G.killList = {}
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G.outboundLinks = []
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G.S2SLogs = []
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G.cwlgd = False
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saveLogs = True
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address = "0.0.0.0"
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# Try to load a message log, if one exists
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try:
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G.msgs = __import__("cache").msgs
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log(f"Got {len(G.msgs)} lines from message cache")
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except ImportError:
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log("No server message cache.", level="WARN")
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except Exception:
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log(
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"Abnormal state! Failed to load cache even though the file exists!",
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level="WARN",
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)
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try:
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filename = sys.argv.pop(0) # Ignore the filename
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for arg in sys.argv:
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if arg.startswith("--port") or arg.startswith("-p"):
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port = int(arg.lstrip("-port="))
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elif arg in ["-c", "--no-cache"]:
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log("Explicitly erasing cached messages")
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G.msgs = []
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elif arg in ["-?", "-h", "--help"]:
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filename = filename if filename.startswith("./") else "python3 " + filename
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print(
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f"""{filename} <args>
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All arguments are optional!
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All areguments are *expected* to only be specified once, if it appears mutliple times, the last one takes priority.
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The exception to the above rule is `--link`, since you could want to link to multiple other servers.
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Accepted arguments:
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-?, -h, --help - Triggers this help dialog
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-l, --no-logs - Disables the saving of logs when the server shuts down
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-c, --no-cache - Disables the loading of cached messages when the server boots
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-p<number>, --port=<number> - Sets the port for the server to use, defaults to `65048`
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--link=<host>:<port> - Establishes an S2S link with remote server <host> on port <port> when the server starts up
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--hostname=<string> - Sets the hostname for this server to use when talking to other servers. Defaults to the current system's hostname (limit of 16 chars)
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--address=<IP> - Sets the IP to listen on, defaults to all addresses (0.0.0.0)
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--cwlgd - Crashes the server when outbound links go down
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Examples:
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{filename} --hostname=Fun-chat --link=chat.example.com:65048 --port=92628
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{filename} --no-logs --no-cache
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{filename} --address=127.0.0.1 -l -p=7288"""
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)
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exit(0)
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elif arg in ["-l", "--no-logs"]:
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log("Explicitly disabling saving of logs!")
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saveLogs = False
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elif arg.startswith("--link"):
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G.outboundLinks.append((arg[7:].split(":")[0], int(arg.split(":")[1])))
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elif arg.startswith("--hostname"):
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G.remoteID = arg[11:]
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if not G.remoteID or len(G.remoteID) > 16:
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raise ValueError
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elif arg.startswith("--address"):
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address = arg[9:]
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elif arg.startswith("--cwlgd"):
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G.cwlgd = True
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log("Server will crasg when outbound links go down!", "WARN")
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else:
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log(f"Unrecognized argument {arg}!", "WARN")
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except Exception:
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sys.tracebacklimit = 0
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raise ValueError("Invalid arguments. Please refer to --help for usage.") from None
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if not saveLogs:
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G.msgs.append(
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b"[00-00-0000 00:00:00] Notice: Logging is disabled on this server instance!\n"
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)
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if len(G.remoteID) > 16:
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G.remoteID = G.remoteID[:15]
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def raw(string: str) -> str:
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s = string.strip()
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s = f"{s!r}"[1:-1].replace("\\\\", "\\")
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if '"' in s:
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return s.replace("\\'", "'")
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else:
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return s
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def fmt(msg: str, name: str = "", action: bool = False) -> str:
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if action:
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return f"* {name}{' '*(20-len(name))} {msg}"
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else:
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return f" {name}{' '*(20-len(name))}: {msg}"
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async def handleClient(reader, writer):
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try:
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name = ""
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global G
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writer.write(b"Please identify yourself. Nick limit is 20 chars.\n")
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await writer.drain()
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name = raw((await reader.read(20)).decode("utf8"))
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if len(name) > 20:
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name = name[
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:19
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] # Really this is only possible if someone passes raw unicode as a nick, but let's clean it up anyways.
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try:
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await asyncio.wait_for(
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reader.read(), 0.01
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) # Silently consume the excess username data
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except TimeoutErrors:
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pass
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if not name:
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writer.write(b"Nice try. Actually set a nick.\n")
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await writer.drain()
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writer.close()
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await writer.wait_closed()
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return
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if name.lower() in G.clientsConnected:
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writer.write(f"Nick ({name}) in use\n".encode("utf8"))
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await writer.drain()
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writer.close()
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await writer.wait_closed()
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return
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if not name.startswith("S2S-"):
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G.clientsConnected[name.lower()] = G.remoteID
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msgIndex = 0
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G.uniqueClients += 1
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G.msgs.extend([log(f"{name} has connected to the server.")])
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G.S2SLogs.append(("+", name, G.remoteID))
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while 1:
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try:
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buffer = await asyncio.wait_for(reader.read(967), 0.1)
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request = raw(buffer.decode("utf8"))
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response = None
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if request.startswith("/mes "):
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response = log(f"* {name}'s {request[5:]}")
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G.S2SLogs.append(("A", (name + "'s", request[5:]), G.remoteID))
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elif request.startswith("/me "):
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response = log(f"* {name} {request[4:]}")
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G.S2SLogs.append(("A", (name, request[4:]), G.remoteID))
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elif request.startswith("/h"):
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writer.write(
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b"""Command List:
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/me <action> - Sends a special message so it looks like you did <action>
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/mes <action> - Same as /me, but adds a 's onto your nick
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/afk [reason] - Optional reason, short hand for `/me is afk [to [reason]]`
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/h, /help - Triggers this command listing
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/back - Shorthand for `/me is back`
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/stats - Sends you some server stats
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/quit - Disconnects you from the server\n"""
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)
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await writer.drain()
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elif request.startswith("/stats"):
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writer.write(
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f"""Server stats:
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Linked servers: {len(G.servers)}
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Connected clients: {G.uniqueClients}
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Total Clients: {len(G.clientsConnected)}
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Messages sent: {len(G.msgs)}
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Please note that this is not network level statistics.\n""".encode(
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"utf8"
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)
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)
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await writer.drain()
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elif request.startswith("/quit"):
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break
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elif request.startswith("/afk"):
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if len(request) > 5:
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response = log(f"* {name} is afk to {request[5:]}")
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G.S2SLogs.append(
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("A", (name, f"is afk to {request[5:]}"), G.remoteID)
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)
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else:
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response = log(f"* {name} is afk")
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G.S2SLogs.append(("A", (name, "is afk"), G.remoteID))
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elif request.startswith("/back"):
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response = log(f"* {name} is back")
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G.S2SLogs.append(("A", (name, "is back"), G.remoteID))
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elif request:
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response = log(f" {name}: {request}")
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G.S2SLogs.append(("M", (name, request), G.remoteID))
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if response:
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G.msgs.append(response)
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except TimeoutErrors:
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pass
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if msgIndex < len(G.msgs):
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writer.writelines(G.msgs[msgIndex:])
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await writer.drain()
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msgIndex = len(G.msgs)
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if name.lower() in G.killList and G.killList[name.lower()]:
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writer.write(b"Your client has been killed by the server\n")
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G.killList[name.lower()] = False
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break
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await writer.drain()
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writer.close()
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await writer.wait_closed()
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G.uniqueClients -= 1
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G.msgs.append(log(f"{name} has disconnected from the server."))
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del G.clientsConnected[name.lower()]
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G.S2SLogs.append(("-", name, G.remoteID))
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else: # This is... probably a server?
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sName = name[4:] # Trim off the S2S label
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if (
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G.servers.get(sName, False) != False
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): # Have to explicitly check, empty list is False, but does not == False
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writer.close()
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await writer.wait_closed()
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return # Server is already "linked", drop the connection
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if G.remoteID == sName: # Hey! you can't *also* be ***me***!
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writer.close()
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await writer.wait_closed()
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return # drop "us"
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G.msgs.append(log(f"{sName} has linked to the network"))
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G.servers[sName] = {}
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msgIndex = 0
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writer.write(b"I am awaiting your client listing.\n")
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while 1:
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client = raw((await reader.read(1024)).decode("utf8"))
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if client == f"END OF CLIENT LISTING FROM {sName}":
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break
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if (
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client.lower() in G.servers[sName]
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or client.lower() in G.clientsConnected
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):
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writer.write(b"K Client rejected: Already exists\n")
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await writer.drain()
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continue
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writer.write(b"I added that client.\n")
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await writer.drain()
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G.msgs.append(log(f"{client} has connected from {sName}"))
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G.servers[sName][client.lower()] = False
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G.S2SLogs.append(("+", client, sName))
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writer.write(f"{G.remoteID}\n".encode("utf8"))
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await writer.drain()
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await reader.read(1024)
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for client in G.clientsConnected:
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writer.write(f"{client}\n".encode("utf8"))
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await writer.drain()
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resp = raw((await reader.read(1024)).decode("utf8"))
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if resp.startswith("K"):
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if G.clientsConnected[client] == G.remoteID:
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G.killList[client] = True
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else:
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G.servers[G.clientsConnected[client]][client] = True
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writer.write(f"END OF CLIENT LISTING FROM {G.remoteID}\n".encode("utf8"))
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await writer.drain()
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for client in G.servers[sName]:
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G.clientsConnected[client] = sName
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msgInd = len(G.S2SLogs)
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while 1:
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try:
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rawMsg = await asyncio.wait_for(reader.read(967), 0.1)
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buffer = raw(rawMsg.decode("utf8"))
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match buffer[0]:
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case "S": # Server notice
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G.msgs.extend([log(buffer[2:])])
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writer.write(b"I Mmm... Blueberries\n")
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case "I":
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pass
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case "+":
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cName = buffer[2:]
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if cName.lower() not in G.clientsConnected:
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G.msgs.append(
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log(f"{cName} has connected from {sName}")
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)
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G.servers[sName][cName.lower()] = False
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G.clientsConnected[cName.lower()] = sName
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G.S2SLogs.append(("+", cName, sName))
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writer.write(b"I Mmm... Pineapples\n")
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else:
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writer.write(f"K {cName}\n".encode("utf8"))
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case "-":
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cName = buffer[2:]
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if G.clientsConnected.get(cName.lower(), None) == sName:
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G.msgs.append(
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log(f"{cName} has disconnected from {sName}")
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)
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del G.servers[sName][cName.lower()]
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del G.clientsConnected[cName.lower()]
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G.S2SLogs.append(("-", cName, sName))
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writer.write(b"I Mmm... Bananas\n")
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else:
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writer.write(
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f"S Your server is LYING about who is connected to it. - {G.remoteID}, a fellow server\n".encode(
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"utf8"
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)
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)
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case "M":
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cName = buffer[2:].split("|", 1)[0]
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message = buffer[2:].split("|", 1)[1]
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G.msgs.append(log(f" {cName}: {message}"))
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G.S2SLogs.append(("M", (cName, message), sName))
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writer.write(
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b"I Get these damn heretic ghost clients out of my store so i can buy my cult candles in peace.\n"
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)
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case "A":
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cName = buffer[2:].split("|", 1)[0]
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message = buffer[2:].split("|", 1)[1]
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G.msgs.append(log(f"* {cName} {message}"))
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G.S2SLogs.append(("A", (cName, message), sName))
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writer.write(b"I Mmm... Strawberries\n")
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case "Q":
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break
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case "K":
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cName = buffer[2:]
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if G.clientsConnected[cName.lower()] == G.remoteID:
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G.killList[cName.lower()] = True
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else:
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G.servers[G.clientsConnected[cName.lower()]][
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cName.lower()
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] = True
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writer.write(b"I Mmm... Blood\n")
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case _:
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writer.write(
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f"S Your server is doing drugs over here, sending me bullshit messages man - {G.remoteID}, A fellow server\n".encode(
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"utf8"
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)
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)
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log(
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f"Recieved invalid message ({buffer}) from {sName}",
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"WARN",
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)
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await writer.drain()
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except TimeoutErrors:
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pass
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if any(G.servers[sName].values()):
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for name in G.servers[sName]:
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if G.servers[sName][name]:
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writer.write(f"K {name}\n".encode("utf8"))
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await writer.drain()
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G.servers[sName][name] = False
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while msgInd < len(G.S2SLogs):
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type, data, server = G.S2SLogs[msgInd]
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# match-case on type
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if server != sName:
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match type:
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case "A":
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nick, msg = data
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writer.write(f"A {nick}|{msg}\n".encode("utf8"))
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case "M":
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nick, msg = data
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writer.write(f"M {nick}|{msg}\n".encode("utf8"))
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case "+":
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writer.write(f"+ {data}\n".encode("utf8"))
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case "-":
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writer.write(f"- {data}\n".encode("utf8"))
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case _:
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pass
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await writer.drain()
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msgInd += 1
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await writer.drain()
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writer.close()
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await writer.wait_closed()
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for cName in G.servers[sName]:
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G.msgs.append(log(f"{cName}'s server is going down"))
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G.S2SLogs.append(("-", cName, sName))
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del G.clientsConnected[cName.lower()]
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del G.servers[sName]
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G.msgs.append(log(f"{sName} has de-linked from the network"))
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except DisconnectErrors:
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if not name:
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return
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if not name.startswith("S2S-"):
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G.uniqueClients -= 1
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G.msgs.append(log(f"{name} has disconnected from the server."))
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G.S2SLogs.append(("-", name, G.remoteID))
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del G.clientsConnected[name.lower()]
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else:
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for cName in G.servers[name[4:]]:
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G.msgs.append(log(f"{cName}'s server is going down"))
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try:
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del G.clientsConnected[cName.lower()]
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G.S2SLogs.append(("-", cName, name[4:]))
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except Exception: # Crash during connection sequence?
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pass
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del G.servers[name[4:]]
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G.msgs.append(log(f"{name[4:]} has de-linked from the network"))
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async def connectServer(hostname: str, port: int):
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global G
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try:
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reader, writer = await asyncio.open_connection(hostname, port)
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await reader.read(1024)
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writer.write(f"S2S-{G.remoteID}\n".encode("utf8"))
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await writer.drain()
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await reader.read(1024)
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for client in G.clientsConnected:
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writer.write(f"{client}\n".encode("utf8"))
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await writer.drain()
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resp = raw((await reader.read(1024)).decode("utf8"))
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if resp.startswith("K"):
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if G.clientsConnected[client] == G.remoteID:
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G.killList[client] = True
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else:
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G.servers[G.clientsConnected[client]][client] = True
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writer.write(f"END OF CLIENT LISTING FROM {G.remoteID}\n".encode("utf8"))
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await writer.drain()
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rID = raw((await reader.read(16)).decode("utf8"))
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try:
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await asyncio.wait_for(reader.read(1024), 0.1)
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except TimeoutErrors:
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pass
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if G.servers.get(rID, False) != False:
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writer.close()
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await writer.wait_closed()
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return
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if G.remoteID == rID:
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writer.close()
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await writer.wait_closed()
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return
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G.msgs.append(log(f"{rID} has linked to the network"))
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G.servers[rID] = {}
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writer.write(b"I recieved your remote ID, now awaiting client listing\n")
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await writer.drain()
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# recieve client list from the other server
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while 1:
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client = raw((await reader.read(1024)).decode("utf8"))
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if client == f"END OF CLIENT LISTING FROM {rID}":
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break
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if client.lower() in G.servers[rID] or client.lower() in G.clientsConnected:
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writer.write(b"K Client rejected: Already exists\n")
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await writer.drain()
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continue
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writer.write(b"I added that client.\n")
|
|
await writer.drain()
|
|
G.msgs.append(log(f"{client} has connected from {rID}"))
|
|
G.servers[rID][client.lower()] = False
|
|
for client in G.servers[rID]:
|
|
G.clientsConnected[client] = rID
|
|
msgInd = len(G.S2SLogs)
|
|
try:
|
|
while 1:
|
|
try:
|
|
rawMsg = await asyncio.wait_for(reader.read(967), 0.1)
|
|
buffer = raw(rawMsg.decode("utf8"))
|
|
match buffer[0]:
|
|
case "S":
|
|
G.msgs.extend([log(buffer[2:])])
|
|
writer.write(b"I Mmm... Blueberries\n")
|
|
case "I":
|
|
pass
|
|
case "+":
|
|
cName = buffer[2:]
|
|
if cName.lower() not in G.clientsConnected:
|
|
G.msgs.append(log(f"{cName} has connected from {rID}"))
|
|
G.S2SLogs.append(("+", cName, rID))
|
|
G.servers[rID][cName.lower()] = False
|
|
G.clientsConnected[cName.lower()] = rID
|
|
writer.write(b"I Mmm... Pineapples\n")
|
|
else:
|
|
writer.write(f"K {cName}\n".encode("utf8"))
|
|
case "-":
|
|
cName = buffer[2:]
|
|
if G.clientsConnected.get(cName.lower(), None) == rID:
|
|
G.msgs.append(
|
|
log(f"{cName} has disconnected from {rID}")
|
|
)
|
|
del G.servers[rID][cName.lower()]
|
|
del G.clientsConnected[cName.lower()]
|
|
G.S2SLogs.append(("-", cName, rID))
|
|
else:
|
|
writer.write(
|
|
f"S Your server is LYING about who is connected to it. - {G.remoteID}, a fellow server\n".encode(
|
|
"utf8"
|
|
)
|
|
)
|
|
case "M":
|
|
cName = buffer[2:].split("|", 1)[0]
|
|
message = buffer[2:].split("|", 1)[1]
|
|
G.msgs.append(log(f" {cName}: {message}"))
|
|
G.S2SLogs.append(("M", (cName, message), rID))
|
|
writer.write(
|
|
b"I Get these damn heretic ghost clients out of my store so i can buy my cult candles in peace.\n"
|
|
)
|
|
case "A":
|
|
cName = buffer[2:].split("|", 1)[0]
|
|
message = buffer[2:].split("|", 1)[1]
|
|
G.S2SLogs.append(("A", (cName, message), rID))
|
|
G.msgs.append(log(f"* {cName} {message}"))
|
|
writer.write(b"I Mmm... Strawberries\n")
|
|
case "Q":
|
|
break
|
|
case "K":
|
|
cName = buffer[2:]
|
|
if G.clientsConnected[cName.lower()] == G.remoteID:
|
|
G.killList[cName.lower()] = True
|
|
else:
|
|
G.servers[G.clientsConnected[cName.lower()]][
|
|
cName.lower()
|
|
] = True
|
|
writer.write(b"I Mmm... Blood\n")
|
|
case _:
|
|
writer.write(
|
|
f"S Your server is doing drugs over here, sending me bullshit messages man - {G.remoteID}, A fellow server\n".encode(
|
|
"utf8"
|
|
)
|
|
)
|
|
log(
|
|
f"Recieved invalid message ({buffer}) from {sName}",
|
|
"WARN",
|
|
)
|
|
await writer.drain()
|
|
except TimeoutErrors:
|
|
pass
|
|
if any(G.servers[rID].values()):
|
|
for name in G.servers[rID]:
|
|
if G.servers[rID][name]:
|
|
writer.write(f"K {name}\n".encode("utf8"))
|
|
await writer.drain()
|
|
G.servers[rID][name] = False
|
|
while msgInd < len(G.S2SLogs):
|
|
type, data, server = G.S2SLogs[msgInd]
|
|
if server != rID:
|
|
match type:
|
|
case "A":
|
|
nick, msg = data
|
|
writer.write(f"A {nick}|{msg}\n".encode("utf8"))
|
|
case "M":
|
|
nick, msg = data
|
|
writer.write(f"M {nick}|{msg}\n".encode("utf8"))
|
|
case "+":
|
|
writer.write(f"+ {data}\n".encode("utf8"))
|
|
case "-":
|
|
writer.write(f"- {data}\n".encode("utf8"))
|
|
case _:
|
|
pass
|
|
await writer.drain()
|
|
msgInd += 1
|
|
if G.cwlgd:
|
|
raise LinkDownError
|
|
await writer.drain()
|
|
writer.close()
|
|
await writer.wait_closed()
|
|
for cName in G.servers[rID]:
|
|
G.msgs.append(log(f"{cName}'s server is going down"))
|
|
del G.clientsConnected[cName.lower()]
|
|
del G.servers[rID]
|
|
G.msgs.append(log(f"{rID} has de-linked from the network"))
|
|
except DisconnectErrors:
|
|
if G.cwlgd:
|
|
raise LinkDownError
|
|
for cName in G.servers[rID]:
|
|
G.msgs.append(log(f"{cName}'s server is going down"))
|
|
try:
|
|
del G.clientsConnected[cName.lower()]
|
|
except Exception:
|
|
pass
|
|
del G.servers[rID]
|
|
G.msgs.append(log(f"{rID} has de-linked from the network"))
|
|
except OSError as E:
|
|
log("OSError: " + str(E), "ERROR")
|
|
if G.cwlgd:
|
|
raise FailedLinkError
|
|
|
|
|
|
async def runServer(address: str, port: int):
|
|
global G
|
|
server = await asyncio.start_server(handleClient, address, port)
|
|
log(f"Listening on port {port}...")
|
|
G.msgs.append(log("Server startup"))
|
|
links = []
|
|
for hostname, portNum in G.outboundLinks:
|
|
links.append(connectServer(hostname, portNum))
|
|
crash = False
|
|
try:
|
|
links.append(G.event.wait())
|
|
await asyncio.gather(*links)
|
|
except LinkDownError:
|
|
G.msgs.append(log("Lost a server link, going down", "FATAL")[1:])
|
|
crash = True
|
|
except FailedLinkError:
|
|
G.msgs.append(log("Failed to establish a server link, going down", "FATAL")[1:])
|
|
except Exception:
|
|
crash = True
|
|
G.msgs.append(log("Server crash", "FATAL")[1:])
|
|
log("Shutting down from Exception", "FATAL")
|
|
Err = format_exc()
|
|
for line in Err.split("\n"):
|
|
log(line, "ERROR")
|
|
finally:
|
|
if not crash:
|
|
G.msgs.append(log("Server shutdown"))
|
|
log("Kicking all clients as we go down")
|
|
server.close()
|
|
# server.abort_clients()
|
|
if saveLogs:
|
|
with open("cache.py", "w") as cache:
|
|
cache.write(f"msgs = {G.msgs}\n")
|
|
log("Saved logs, exiting now.")
|
|
else:
|
|
log("Not saving logs, exiting now.")
|
|
|
|
|
|
class ServerInterruptException(KeyboardInterrupt): ...
|
|
|
|
|
|
def interruptCatch(s, f):
|
|
global G
|
|
print()
|
|
G.loop.call_soon_threadsafe(G.event.set)
|
|
G.interruptCount += 1
|
|
sys.tracebacklimit = 0
|
|
raise ServerInterruptException from None
|
|
|
|
|
|
signal.signal(signal.SIGINT, interruptCatch)
|
|
asyncio.run(runServer(address, port))
|