455 lines
16 KiB
Python
455 lines
16 KiB
Python
#!/usr/bin/env python
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# License: GPLv3 Copyright: 2022, Kovid Goyal <kovid at kovidgoyal.net>
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import io
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import json
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import os
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import select
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import signal
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import sys
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import time
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from contextlib import suppress
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from dataclasses import dataclass
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from importlib import import_module
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from typing import (
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IO, TYPE_CHECKING, Any, Dict, List, NoReturn, Optional, Union, cast
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)
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from kitty.child import remove_cloexec
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from kitty.constants import kitty_exe
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from kitty.entry_points import main as main_entry_point
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from kitty.fast_data_types import establish_controlling_tty, safe_pipe
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from kitty.shm import SharedMemory
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if TYPE_CHECKING:
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from _typeshed import ReadableBuffer, WriteableBuffer
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hangup_events = select.POLLHUP
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error_events = select.POLLERR | select.POLLNVAL
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basic_events = hangup_events | error_events
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class PrewarmProcessFailed(Exception):
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pass
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@dataclass
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class Child:
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child_id: int
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child_process_pid: int
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class PrewarmProcess:
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def __init__(self, create_file_to_read_from_worker: bool = False) -> None:
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self.from_worker_fd, self.in_worker_fd = safe_pipe()
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self.children: Dict[int, Child] = {}
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if create_file_to_read_from_worker:
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os.set_blocking(self.from_worker_fd, True)
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self.from_worker = open(self.from_worker_fd, mode='r', closefd=True)
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self.from_worker_fd = -1
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def take_from_worker_fd(self) -> int:
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ans, self.from_worker_fd = self.from_worker_fd, -1
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return ans
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def __del__(self) -> None:
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if self.from_worker_fd > -1:
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os.close(self.from_worker_fd)
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self.from_worker_fd = -1
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if hasattr(self, 'from_worker'):
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self.from_worker.close()
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del self.from_worker
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if self.worker_started:
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import subprocess
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self.process.stdin and self.process.stdin.close()
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self.process.stdout and self.process.stdout.close()
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try:
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self.process.wait(timeout=1.0)
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except subprocess.TimeoutExpired:
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self.process.kill()
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del self.process
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@property
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def worker_started(self) -> bool:
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return self.in_worker_fd == -1
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def ensure_worker(self) -> None:
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if not self.worker_started:
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import subprocess
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self.process = subprocess.Popen(
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[kitty_exe(), '+kitten', 'prewarm', str(self.in_worker_fd)], stdin=subprocess.PIPE, stdout=subprocess.PIPE, pass_fds=(self.in_worker_fd,))
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os.close(self.in_worker_fd)
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self.in_worker_fd = -1
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assert self.process.stdin is not None and self.process.stdout is not None
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self.write_to_process_fd = self.process.stdin.fileno()
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self.read_from_process_fd = self.process.stdout.fileno()
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os.set_blocking(self.write_to_process_fd, False)
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os.set_blocking(self.read_from_process_fd, False)
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self.poll = select.poll()
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self.poll.register(self.process.stdout.fileno(), select.POLLIN | basic_events)
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def poll_to_send(self, yes: bool = True) -> None:
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if yes:
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self.poll.register(self.write_to_process_fd, select.POLLOUT | basic_events)
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else:
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self.poll.unregister(self.write_to_process_fd)
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def reload_kitty_config(self) -> None:
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if self.worker_started:
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self.send_to_prewarm_process('reload_kitty_config:\n')
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def __call__(
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self,
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tty_fd: int,
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argv: List[str],
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cwd: str = '',
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env: Optional[Dict[str, str]] = None,
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stdin_data: Optional[Union[str, bytes]] = None
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) -> Child:
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self.ensure_worker()
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tty_name = os.ttyname(tty_fd)
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if isinstance(stdin_data, str):
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stdin_data = stdin_data.encode()
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if env is None:
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env = dict(os.environ)
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cmd: Dict[str, Union[int, List[str], str, Dict[str, str]]] = {
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'tty_name': tty_name, 'cwd': cwd or os.getcwd(), 'argv': argv, 'env': env,
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}
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total_size = 0
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if stdin_data is not None:
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cmd['stdin_size'] = len(stdin_data)
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total_size += len(stdin_data)
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data = json.dumps(cmd).encode()
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total_size += len(data) + SharedMemory.num_bytes_for_size
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with SharedMemory(size=total_size, unlink_on_exit=True) as shm:
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shm.write_data_with_size(data)
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if stdin_data:
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shm.write(stdin_data)
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shm.flush()
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self.send_to_prewarm_process(f'fork:{shm.name}\n')
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input_buf = b''
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st = time.monotonic()
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while time.monotonic() - st < 2:
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for (fd, event) in self.poll.poll(0.2):
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if event & basic_events:
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raise PrewarmProcessFailed('Failed doing I/O with prewarm process')
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if fd == self.read_from_process_fd and event & select.POLLIN:
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d = os.read(self.read_from_process_fd, io.DEFAULT_BUFFER_SIZE)
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input_buf += d
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while (idx := input_buf.find(b'\n')) > -1:
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line = input_buf[:idx].decode()
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input_buf = input_buf[idx+1:]
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if line.startswith('CHILD:'):
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_, cid, pid = line.split(':')
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child = self.add_child(int(cid), int(pid))
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shm.unlink_on_exit = False
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return child
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if line.startswith('ERR:'):
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raise PrewarmProcessFailed(line.split(':', 1)[-1])
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raise PrewarmProcessFailed('Timed out waiting for I/O with prewarm process')
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def add_child(self, child_id: int, pid: int) -> Child:
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self.children[child_id] = c = Child(child_id, pid)
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return c
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def send_to_prewarm_process(self, output_buf: Union[str, bytes] = b'', timeout: float = 2) -> None:
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if isinstance(output_buf, str):
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output_buf = output_buf.encode()
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st = time.monotonic()
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while time.monotonic() - st < timeout and output_buf:
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self.poll_to_send(bool(output_buf))
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for (fd, event) in self.poll.poll(0.2):
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if event & basic_events:
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raise PrewarmProcessFailed('Failed doing I/O with prewarm process')
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if fd == self.write_to_process_fd and event & select.POLLOUT:
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n = os.write(self.write_to_process_fd, output_buf)
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output_buf = output_buf[n:]
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self.poll_to_send(False)
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if output_buf:
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raise PrewarmProcessFailed('Timed out waiting to write to prewarm process')
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def mark_child_as_ready(self, child_id: int) -> bool:
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c = self.children.pop(child_id, None)
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if c is None:
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return False
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self.send_to_prewarm_process(f'ready:{child_id}\n')
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return True
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def reload_kitty_config() -> None:
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from kittens.tui.utils import kitty_opts
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kitty_opts.clear_cached()
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kitty_opts()
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def prewarm() -> None:
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reload_kitty_config()
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for kitten in ('hints', 'ssh', 'unicode_input', 'ask', 'show_error'):
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import_module(f'kittens.{kitten}.main')
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class MemoryViewReadWrapperBytes(io.BufferedIOBase):
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def __init__(self, mw: memoryview):
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self.mw = mw
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self.pos = 0
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def detach(self) -> io.RawIOBase:
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raise io.UnsupportedOperation('detach() not supported')
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def read(self, size: Optional[int] = -1) -> bytes:
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if size is None or size < 0:
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size = max(0, len(self.mw) - self.pos)
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oldpos = self.pos
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self.pos = min(len(self.mw), self.pos + size)
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if self.pos <= oldpos:
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return b''
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return bytes(self.mw[oldpos:self.pos])
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def readinto(self, b: 'WriteableBuffer') -> int:
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if not isinstance(b, memoryview):
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b = memoryview(b)
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b = b.cast('B')
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data = self.read(len(b))
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n = len(data)
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b[:n] = data
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return n
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readinto1 = readinto
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def readall(self) -> bytes:
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return self.read()
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def write(self, b: 'ReadableBuffer') -> int:
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raise io.UnsupportedOperation('readonly stream')
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def readable(self) -> bool:
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return True
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class MemoryViewReadWrapper(io.TextIOWrapper):
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def __init__(self, mw: memoryview):
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super().__init__(cast(IO[bytes], MemoryViewReadWrapperBytes(mw)), encoding='utf-8', errors='replace')
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def child_main(cmd: Dict[str, Any], ready_fd: int) -> NoReturn:
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cwd = cmd.get('cwd')
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if cwd:
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try:
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os.chdir(cwd)
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except OSError:
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with suppress(OSError):
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os.chdir('/')
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os.setsid()
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env = cmd.get('env')
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if env is not None:
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os.environ.clear()
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os.environ.update(env)
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argv = cmd.get('argv')
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if argv:
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sys.argv = list(argv)
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poll = select.poll()
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poll.register(ready_fd, select.POLLIN | select.POLLERR | select.POLLHUP)
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poll.poll()
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os.close(ready_fd)
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tty_name = cmd.get('tty_name')
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if tty_name:
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sys.__stdout__.flush()
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sys.__stderr__.flush()
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establish_controlling_tty(tty_name, sys.__stdin__.fileno(), sys.__stdout__.fileno(), sys.__stderr__.fileno())
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main_entry_point()
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raise SystemExit(0)
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def fork(shm_address: str, ready_fd: int) -> int:
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sz = pos = 0
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with SharedMemory(name=shm_address, unlink_on_exit=True) as shm:
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data = shm.read_data_with_size()
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cmd = json.loads(data)
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sz = cmd.get('stdin_size', 0)
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if sz:
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pos = shm.tell()
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shm.unlink_on_exit = False
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try:
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child_pid = os.fork()
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except OSError:
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if sz:
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with SharedMemory(shm_address, unlink_on_exit=True):
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pass
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if child_pid:
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# master process
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return child_pid
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# child process
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if shm.unlink_on_exit:
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child_main(cmd, ready_fd)
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else:
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with SharedMemory(shm_address, unlink_on_exit=True) as shm:
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stdin_data = memoryview(shm.mmap)[pos:pos + sz]
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if stdin_data:
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sys.stdin = MemoryViewReadWrapper(stdin_data)
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try:
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child_main(cmd, ready_fd)
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finally:
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stdin_data.release()
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sys.stdin = sys.__stdin__
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def waitstatus_to_exit_code(status: int) -> int:
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with suppress(ValueError, AttributeError):
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return os.waitstatus_to_exitcode(status)
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return 0
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def main(args: List[str] = sys.argv) -> None:
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read_signal_fd, write_signal_fd = safe_pipe()
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notify_child_death_fd = int(sys.argv[-1])
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os.set_blocking(notify_child_death_fd, False)
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signal.set_wakeup_fd(write_signal_fd)
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signal.signal(signal.SIGCHLD, lambda *a: None)
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signal.siginterrupt(signal.SIGCHLD, False)
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prewarm()
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stdin_fd = sys.__stdin__.fileno()
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os.set_blocking(stdin_fd, False)
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stdout_fd = sys.__stdout__.fileno()
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os.set_blocking(stdout_fd, False)
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poll = select.poll()
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poll.register(stdin_fd, select.POLLIN | basic_events)
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poll.register(read_signal_fd, select.POLLIN | basic_events)
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input_buf = output_buf = child_death_buf = b''
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child_ready_fds: Dict[int, int] = {}
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child_id_map: Dict[int, int] = {}
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self_pid = os.getpid()
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def check_event(event: int, err_msg: str) -> None:
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if event & hangup_events:
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raise SystemExit(0)
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if event & error_events:
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raise SystemExit(err_msg)
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def handle_input(event: int) -> None:
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nonlocal input_buf, output_buf
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check_event(event, 'Polling of STDIN failed')
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if not (event & select.POLLIN):
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return
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d = os.read(stdin_fd, io.DEFAULT_BUFFER_SIZE)
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if not d:
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raise SystemExit(0)
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input_buf += d
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while (idx := input_buf.find(b'\n')) > -1:
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line = input_buf[:idx].decode()
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input_buf = input_buf[idx+1:]
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cmd, _, payload = line.partition(':')
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if cmd == 'reload_kitty_config':
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reload_kitty_config()
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elif cmd == 'ready':
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child_id = int(payload)
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cfd = child_ready_fds.pop(child_id)
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if cfd is not None:
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os.write(cfd, b'1')
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os.close(cfd)
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elif cmd == 'fork':
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read_fd, write_fd = safe_pipe(False)
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remove_cloexec(read_fd)
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try:
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child_pid = fork(payload, read_fd)
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except Exception as e:
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es = str(e).replace('\n', ' ')
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output_buf += f'ERR:{es}\n'.encode()
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else:
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child_id = len(child_id_map) + 1
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child_id_map[child_id] = child_pid
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child_ready_fds[child_id] = write_fd
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output_buf += f'CHILD:{child_id}:{child_pid}\n'.encode()
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finally:
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if os.getpid() == self_pid:
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os.close(read_fd)
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elif cmd == 'echo':
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output_buf += f'{payload}\n'.encode()
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def handle_output(event: int) -> None:
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nonlocal output_buf
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check_event(event, 'Polling of STDOUT failed')
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if not (event & select.POLLOUT):
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return
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if output_buf:
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n = os.write(stdout_fd, output_buf)
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if not n:
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raise SystemExit(0)
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output_buf = output_buf[n:]
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if not output_buf:
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poll.unregister(stdout_fd)
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def handle_notify_child_death(event: int) -> None:
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nonlocal child_death_buf
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check_event(event, 'Polling of notify child death fd failed')
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if not (event & select.POLLOUT):
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return
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if child_death_buf:
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n = os.write(notify_child_death_fd, child_death_buf)
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if not n:
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raise SystemExit(0)
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child_death_buf = child_death_buf[n:]
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if not child_death_buf:
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poll.unregister(notify_child_death_fd)
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def handle_signal(event: int) -> None:
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nonlocal child_death_buf
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check_event(event, 'Polling of signal fd failed')
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if not (event & select.POLLIN):
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return
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d = os.read(read_signal_fd, io.DEFAULT_BUFFER_SIZE)
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if not d:
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raise SystemExit(0)
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signals = set(bytearray(d))
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if signal.SIGCHLD in signals:
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while True:
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try:
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pid, exit_status = os.waitpid(-1, os.WNOHANG)
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except ChildProcessError:
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break
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matched_child_id = -1
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for child_id, child_pid in child_id_map.items():
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if child_pid == pid:
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matched_child_id = child_id
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break
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if matched_child_id > -1:
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del child_id_map[matched_child_id]
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child_ready_fds.pop(matched_child_id, None)
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child_death_buf += f'{pid}\n'.encode()
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try:
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while True:
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if output_buf:
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poll.register(stdout_fd, select.POLLOUT | basic_events)
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if child_death_buf:
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poll.register(notify_child_death_fd, select.POLLOUT | basic_events)
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for (q, event) in poll.poll():
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if q == stdin_fd:
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handle_input(event)
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elif q == stdout_fd:
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handle_output(event)
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elif q == read_signal_fd:
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handle_signal(event)
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elif q == notify_child_death_fd:
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handle_notify_child_death(event)
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except (KeyboardInterrupt, EOFError, BrokenPipeError):
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if os.getpid() == self_pid:
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raise SystemExit(1)
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raise
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except Exception:
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if os.getpid() == self_pid:
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import traceback
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traceback.print_exc()
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raise
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finally:
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if os.getpid() == self_pid:
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for fmd in child_ready_fds.values():
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with suppress(OSError):
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os.close(fmd)
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if __name__ == '__main__':
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main()
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