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authorterminaldweller <thabogre@gmail.com>2023-01-30 13:33:51 +0000
committerterminaldweller <thabogre@gmail.com>2023-01-30 13:33:51 +0000
commit7cee58615f3a1bdd08273dbf2fc678414bd7b264 (patch)
treedbcb9da56fef57a0dde831b17a8996fb48c6a5ad /tunneltop.py
parentinitial commit (diff)
downloadtunneltop-7cee58615f3a1bdd08273dbf2fc678414bd7b264.tar.gz
tunneltop-7cee58615f3a1bdd08273dbf2fc678414bd7b264.zip
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Diffstat (limited to 'tunneltop.py')
-rwxr-xr-xtunneltop.py558
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diff --git a/tunneltop.py b/tunneltop.py
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+++ b/tunneltop.py
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+#!/usr/bin/env python
+"""A top-like program for monitoring ssh tunnels or any tunnels"""
+# TODO- the disabled coloring is not working
+# TODO- quit doesnt work
+# TODO- we are reviving dead tunnels
+import argparse
+import asyncio
+import copy
+import curses
+import enum
+import os
+import signal
+import sys
+import tomllib
+import typing
+
+
+class Argparser: # pylint: disable=too-few-public-methods
+ """Argparser class."""
+
+ def __init__(self):
+ self.parser = argparse.ArgumentParser()
+ self.parser.add_argument(
+ "--config",
+ "-c",
+ type=str,
+ help="The path to the .tunneltop.toml file,"
+ " defaults to $HOME/.tunneltop.toml",
+ default="~/.tunneltop.toml",
+ )
+ self.parser.add_argument(
+ "--noheader",
+ "-n",
+ type=bool,
+ help="Dont print the header in the output",
+ default=False,
+ )
+ self.parser.add_argument(
+ "--delay",
+ "-d",
+ type=float,
+ help="The delay between redraws in seconds, defaults to 5 seconds",
+ default=5,
+ )
+ self.args = self.parser.parse_args()
+
+
+# pylint: disable=too-few-public-methods
+class Colors(enum.EnumType):
+ """static color definitions"""
+
+ purple = "\033[95m"
+ blue = "\033[94m"
+ green = "\033[92m"
+ yellow = "\033[93m"
+ red = "\033[91m"
+ grey = "\033[1;37m"
+ darkgrey = "\033[1;30m"
+ cyan = "\033[1;36m"
+ ENDC = "\033[0m"
+ BOLD = "\033[1m"
+ UNDERLINE = "\033[4m"
+ blueblue = "\x1b[38;5;24m"
+ greenie = "\x1b[38;5;23m"
+ goo = "\x1b[38;5;22m"
+ screen_clear = "\033c\033[3J"
+ hide_cursor = "\033[?25l"
+
+
+# pylint: disable=too-many-locals
+def ffs(
+ offset: int,
+ header_list: typing.Optional[typing.List[str]],
+ numbered: bool,
+ no_color: bool,
+ *args,
+) -> typing.List[str]:
+ """A simple columnar printer"""
+ max_column_width = []
+ lines = []
+ numbers_f: typing.List[int] = []
+ dummy = []
+
+ if no_color or not sys.stdout.isatty():
+ greenie = ""
+ bold = ""
+ endc = ""
+ goo = ""
+ blueblue = ""
+ else:
+ greenie = Colors.greenie
+ bold = Colors.BOLD
+ endc = Colors.ENDC
+ goo = Colors.goo
+ blueblue = Colors.blueblue
+
+ for arg in args:
+ max_column_width.append(max(len(repr(argette)) for argette in arg))
+
+ if header_list is not None:
+ if numbered:
+ numbers_f.extend(range(1, len(args[-1]) + 1))
+ max_column_width.append(
+ max(len(repr(number)) for number in numbers_f)
+ )
+ header_list.insert(0, "idx")
+
+ index = range(0, len(header_list))
+ for header, width, i in zip(header_list, max_column_width, index):
+ max_column_width[i] = max(len(header), width) + offset
+
+ for i in index:
+ dummy.append(
+ greenie
+ + bold
+ + header_list[i].ljust(max_column_width[i])
+ + endc
+ )
+ lines.append("".join(dummy))
+ dummy.clear()
+
+ index2 = range(0, len(args[-1]))
+ for i in index2:
+ if numbered:
+ dummy.append(
+ goo + bold + repr(i).ljust(max_column_width[0]) + endc
+ )
+ for arg, width in zip(args, max_column_width[1:]):
+ dummy.append(blueblue + (arg[i]).ljust(width) + endc)
+ else:
+ for arg, width in zip(args, max_column_width):
+ dummy.append(blueblue + (arg[i]).ljust(width) + endc)
+ lines.append("".join(dummy))
+ dummy.clear()
+ return lines
+
+
+def render(
+ data_cols: typing.Dict[str, typing.Dict[str, str]],
+ tasks: typing.List[asyncio.Task],
+ stdscr,
+ sel: int,
+):
+ """Render the text"""
+ lines = ffs(
+ 2,
+ ["NAME", "ADDRESS", "PORT", "STATUS", "STDOUT", "STDERR"],
+ False,
+ True,
+ [v["name"] for _, v in data_cols.items()],
+ [v["address"] for _, v in data_cols.items()],
+ [repr(v["port"]) for _, v in data_cols.items()],
+ [v["status"] for _, v in data_cols.items()],
+ [v["stdout"] for _, v in data_cols.items()],
+ [v["stderr"] for _, v in data_cols.items()],
+ )
+ iterator = iter(lines)
+ stdscr.addstr(1, 1, lines[0], curses.color_pair(3))
+ next(iterator)
+ for i, line in enumerate(iterator):
+ try:
+ line_content = stdscr.instr(sel + 2, 1).decode("utf-8")
+ name: str = line_content[: line_content.find(" ")]
+ finally:
+ name = ""
+ if i == sel:
+ stdscr.addstr(
+ (2 + i) % (len(lines) + 1),
+ 1,
+ line,
+ curses.color_pair(2)
+ if name not in tasks
+ else curses.color_pair(5),
+ )
+ else:
+ stdscr.addstr(
+ 2 + i,
+ 1,
+ line,
+ curses.color_pair(1)
+ if name not in tasks
+ else curses.color_pair(4),
+ )
+ stdscr.addstr("\n")
+ stdscr.box()
+
+
+def curses_init():
+ """Initialize ncurses"""
+ stdscr = curses.initscr()
+ curses.start_color()
+ curses.use_default_colors()
+ curses.curs_set(False)
+ curses.noecho()
+ curses.cbreak()
+ stdscr.keypad(True)
+ curses.halfdelay(20)
+ curses.init_pair(1, curses.COLOR_GREEN, curses.COLOR_BLACK)
+ curses.init_pair(2, curses.COLOR_BLACK, curses.COLOR_GREEN)
+ curses.init_pair(3, curses.COLOR_BLUE, curses.COLOR_BLACK)
+ curses.init_pair(4, curses.COLOR_CYAN, curses.COLOR_BLACK)
+ curses.init_pair(5, curses.COLOR_BLACK, curses.COLOR_CYAN)
+
+ return stdscr
+
+
+class TunnelManager:
+ """The tunnel top class"""
+
+ def __init__(self):
+ self.argparser = Argparser()
+ self.data_cols: typing.Dict[
+ str, typing.Dict[str, str]
+ ] = self.read_conf()
+ self.tunnel_tasks: typing.List[asyncio.Task] = []
+ self.tunnel_test_tasks: typing.List[asyncio.Task] = []
+ self.scheduler_task: asyncio.Task
+ self.scheduler_table: typing.Dict[
+ str, int
+ ] = self.init_scheduler_table()
+ # we use this when its time to quit. this will prevent any
+ # new tasks from being scheduled
+ self.are_we_dying: bool = False
+
+ def init_scheduler_table(self) -> typing.Dict[str, int]:
+ """initialize the scheduler table"""
+ result: typing.Dict[str, int] = {}
+ for key, value in self.data_cols.items():
+ if "test_interval" in value and value["test_command"] != "":
+ result[key] = 0
+
+ return result
+
+ async def stop_task(
+ self,
+ delete_task: asyncio.Task,
+ task_list: typing.List[asyncio.Task],
+ delete: bool = True,
+ ):
+ """Remove the reference"""
+ delete_index: int = -1
+ delete_task.cancel()
+ self.write_log(f"{delete_task.get_name()} is being cancelled\n")
+ await asyncio.sleep(0)
+ for i, task in enumerate(task_list):
+ if task.get_name() == delete_task.get_name():
+ delete_index = i
+ break
+
+ if delete and delete_index >= 0:
+ task_list.remove(self.tunnel_tasks[delete_index])
+
+ def read_conf(self) -> typing.Dict[str, typing.Dict[str, str]]:
+ """Read the config file"""
+ data_cols: typing.Dict[str, typing.Dict[str, str]] = {}
+ with open(
+ os.path.expanduser(self.argparser.args.config), "rb"
+ ) as conf_file:
+ data = tomllib.load(conf_file)
+ for key, value in data.items():
+ data_cols[key] = {
+ "name": key,
+ "address": value["address"],
+ "port": value["port"],
+ "command": value["command"],
+ "status": "UNKN",
+ "test_command": value["test_command"],
+ "test_command_result": value["test_command_result"],
+ "test_interval": value["test_interval"],
+ "test_timeout": value["test_timeout"],
+ "stdout": "",
+ "stderr": "",
+ }
+ return data_cols
+
+ async def run_subprocess(self, cmd: str) -> typing.Tuple[bytes, bytes]:
+ """Run a command"""
+ try:
+ proc = await asyncio.create_subprocess_exec(
+ *cmd.split(" "),
+ stdout=asyncio.subprocess.PIPE,
+ stderr=asyncio.subprocess.PIPE,
+ )
+
+ return await proc.communicate()
+ except asyncio.TimeoutError:
+ proc.terminate()
+ raise
+ except asyncio.CancelledError:
+ proc.terminate()
+ raise
+
+ async def run_test_coro(
+ self, cmd: str, task_name: str
+ ) -> typing.Tuple[bytes, bytes]:
+ """Run a test command"""
+ try:
+ stdout, stderr = await self.run_subprocess(cmd)
+ stdout_str: str = stdout.decode("utf-8").strip("\n").strip('"')
+ stderr_str: str = stderr.decode("utf-8").strip("\n").strip('"')
+
+ self.data_cols[task_name]["stdout"] = stdout_str
+ self.data_cols[task_name]["stderr"] = stderr_str
+ if stdout_str == self.data_cols[task_name]["test_command_result"]:
+ self.data_cols[task_name]["status"] = "UP"
+ else:
+ self.data_cols[task_name]["status"] = "DOWN"
+
+ return stdout, stderr
+ except asyncio.TimeoutError:
+ self.data_cols[task_name]["status"] = "TMOUT"
+ self.data_cols[task_name]["stdout"] = "-"
+ self.data_cols[task_name]["stderr"] = "-"
+ raise
+
+ async def tunnel_procs(
+ self,
+ ) -> typing.List[asyncio.Task]:
+ """run all the tunnels in the background as separate subprocesses"""
+ tasks: typing.List[asyncio.Task] = []
+ for _, value in self.data_cols.items():
+ tasks.append(
+ asyncio.create_task(
+ self.run_subprocess(value["command"]), name=value["name"]
+ ),
+ )
+ await asyncio.sleep(0)
+
+ return tasks
+
+ async def sighup_handler_async_worker(self, data_cols_new) -> None:
+ """Handles the actual updating of tasks when we get SIGTERM"""
+ delete_task: typing.Optional[asyncio.Task] = None
+ for k, value in data_cols_new.items():
+ if k not in self.data_cols:
+ self.tunnel_tasks.append(
+ asyncio.create_task(
+ self.run_subprocess(value["command"]), name=k
+ )
+ )
+ await asyncio.sleep(0)
+ self.data_cols[k] = copy.deepcopy(value)
+ if k in self.scheduler_table:
+ self.scheduler_table[k] = 0
+ else:
+ if (
+ self.data_cols[k]["command"] != data_cols_new[k]["command"]
+ or self.data_cols[k]["port"] != data_cols_new[k]["port"]
+ or self.data_cols[k]["address"]
+ != data_cols_new[k]["address"]
+ ):
+ for task in self.tunnel_tasks:
+ if task.get_name() == k:
+ delete_task = task
+ break
+ # task.cancel()
+ # await asyncio.sleep(0)
+
+ if delete_task is not None:
+ await self.stop_task(delete_task, self.tunnel_tasks)
+ delete_task = None
+ self.data_cols[k] = copy.deepcopy(data_cols_new[k])
+ self.tunnel_tasks.append(
+ asyncio.create_task(
+ self.run_subprocess(value["command"]), name=k
+ )
+ )
+ if k in self.scheduler_table:
+ self.scheduler_table[k] = 0
+ await asyncio.sleep(0)
+
+ for k, _ in self.data_cols.items():
+ if k not in data_cols_new:
+ for task in self.tunnel_tasks:
+ if task.get_name() == k:
+ # task.cancel()
+ # await asyncio.sleep(0)
+ delete_task = task
+ break
+ if delete_task is not None:
+ await self.stop_task(delete_task, self.tunnel_tasks)
+ delete_task = None
+ del self.data_cols[k]
+ if k in self.scheduler_table:
+ del self.scheduler_table[k]
+
+ async def sighup_handler(self) -> None:
+ """SIGHUP handler. we want to reload the config."""
+ # type: ignore # pylint: disable=E0203
+ data_cols_new: typing.Dict[str, typing.Dict[str, str]] = {}
+ data_cols_new = self.read_conf()
+ await self.sighup_handler_async_worker(data_cols_new)
+
+ def write_log(self, log: str):
+ """A simple logger"""
+ with open(
+ "/home/devi/devi/abbatoir/hole15/log",
+ "a",
+ encoding="utf-8",
+ ) as logfile:
+ logfile.write(log)
+
+ async def restart_task(self, line_content: str) -> None:
+ """restart a task"""
+ name: str = line_content[: line_content.find(" ")]
+ # was_cancelled: bool = False
+ for task in self.tunnel_tasks:
+ if task.get_name() == name:
+ # was_cancelled = task.cancel()
+ # self.write_log(f"was_cancelled: {was_cancelled}")
+ await self.stop_task(task, self.tunnel_tasks)
+ # await task
+ # await asyncio.sleep(0)
+ for _, value in self.data_cols.items():
+ if value["name"] == name and task.cancelled():
+ self.tunnel_tasks.append(
+ asyncio.create_task(
+ self.run_subprocess(value["command"]),
+ name=value["name"],
+ )
+ )
+ await asyncio.sleep(0)
+
+ async def flip_task(self, line_content: str) -> None:
+ """flip a task"""
+ name: str = line_content[: line_content.find(" ")]
+ # was_cancelled: bool = False
+ was_active: bool = False
+ for task in self.tunnel_tasks:
+ if task.get_name() == name:
+ await self.stop_task(task, self.tunnel_tasks)
+ # was_cancelled = task.cancel()
+ # await asyncio.sleep(0)
+ # self.write_log(f"was_cancelled: {was_cancelled}")
+ # await task
+ was_active = True
+ break
+
+ if not was_active:
+ for _, value in self.data_cols.items():
+ if value["name"] == name:
+ self.tunnel_tasks.append(
+ asyncio.create_task(
+ self.run_subprocess(value["command"]),
+ name=value["name"],
+ )
+ )
+ await asyncio.sleep(0)
+
+ async def quit(self) -> None:
+ """Cleanly quit the applicaiton"""
+ # scheduler checks for this to stop running new tests
+ # when we want to quit
+ self.are_we_dying = True
+
+ for task in asyncio.all_tasks():
+ task.cancel()
+ await asyncio.sleep(0)
+ try:
+ await asyncio.gather(*asyncio.all_tasks())
+ finally:
+ sys.exit(0)
+
+ async def scheduler(self) -> None:
+ """scheduler manages running the tests and reviving dead tunnels"""
+ try:
+ while True:
+ if self.are_we_dying:
+ return
+ for key, value in self.scheduler_table.items():
+ if value == 0 and key not in self.tunnel_test_tasks:
+ tunnel_entry = self.data_cols[key]
+ test_task = asyncio.create_task(
+ asyncio.wait_for(
+ self.run_test_coro(
+ tunnel_entry["test_command"],
+ tunnel_entry["name"],
+ ),
+ timeout=float(tunnel_entry["test_timeout"]),
+ ),
+ name=key,
+ )
+ self.tunnel_test_tasks.append(test_task)
+ self.scheduler_table[key] = int(
+ tunnel_entry["test_interval"]
+ )
+ await asyncio.sleep(0)
+ else:
+ self.scheduler_table[key] = (
+ self.scheduler_table[key] - 1
+ )
+
+ # we are using a 1 second ticker. basically the scheduler
+ # runs every second instead of as fast as it can
+ await asyncio.sleep(1)
+ except asyncio.CancelledError:
+ pass
+
+ async def tui_loop(self) -> None:
+ """the tui loop"""
+ sel: int = 0
+ try:
+ stdscr = curses_init()
+ # we spawn the tunnels and the test scheduler put them
+ # in the background and then run the TUI loop
+ self.tunnel_tasks = await self.tunnel_procs()
+ self.scheduler_task = asyncio.create_task(
+ self.scheduler(), name="scheduler"
+ )
+ loop = asyncio.get_event_loop()
+ loop.add_signal_handler(
+ signal.SIGHUP,
+ lambda: asyncio.create_task(self.sighup_handler()),
+ )
+
+ while True:
+ stdscr.clear()
+ render(self.data_cols, self.tunnel_tasks, stdscr, sel)
+ char = stdscr.getch()
+
+ if char == ord("j") or char == curses.KEY_DOWN:
+ sel = (sel + 1) % len(self.data_cols)
+ elif char == ord("k") or char == curses.KEY_UP:
+ sel = (sel - 1) % len(self.data_cols)
+ elif char == ord("g") or char == curses.KEY_UP:
+ sel = 0
+ elif char == ord("G") or char == curses.KEY_UP:
+ sel = len(self.data_cols) - 1
+ elif char == ord("r"):
+ line_content = stdscr.instr(sel + 2, 1)
+ await self.restart_task(line_content.decode("utf-8"))
+ elif char == ord("q"):
+ await self.quit()
+ elif char == ord("s"):
+ line_content = stdscr.instr(sel + 2, 1)
+ await self.flip_task(line_content.decode("utf-8"))
+
+ stdscr.refresh()
+ await asyncio.sleep(0)
+ finally:
+ curses.nocbreak()
+ stdscr.keypad(False)
+ curses.echo()
+ curses.endwin()
+ # tasks = asyncio.all_tasks()
+ # for task in tasks:
+ # task.cancel()
+ await self.quit()
+
+
+def main() -> None:
+ """entry point"""
+ tunnel_manager = TunnelManager()
+ asyncio.run(tunnel_manager.tui_loop())
+
+
+if __name__ == "__main__":
+ main()