subprocess-util/exec_print_receive.py

#!/usr/bin/env python3
# -*- coding: utf-8 -*-
import subprocess
import sys
import threading
from pathlib import Path
from typing import IO, AnyStr

from receive_inform import receive_inform


def _print_stdout(bin_pipe: IO[AnyStr]):
    b: bytes
    for b in bin_pipe:
        sys.stdout.write(f'[STDOUT] {b.decode("UTF-8")}')

    # TODO: Has this any effect?
    # bin_pipe.close()


def _print_stderr(bin_pipe: IO[AnyStr]):
    b: bytes
    for b in bin_pipe:
        sys.stderr.write(f'[STDERR] {b.decode("UTF-8")}')

    # TODO: Has this any effect?
    # bin_pipe.close()


def execute_print_receive_chunks(command: list[str],
                                 socket_file: Path,
                                 chunk_file_tmpl: Path) -> int:
    process = subprocess.Popen(
        command,
        stdin=subprocess.PIPE,
        stdout=subprocess.PIPE,
        stderr=subprocess.PIPE,
        close_fds=True,
    )

    # TODO - This function
    # - execute the command (print live stdout/stderr)
    #
    # TODO - Inside receive_inform()
    # - while True
    #   - wait for message at socket_file
    #   - if 'OK\n'
    #     - determine chunk filename
    #     - read chunk, pass to stdin of command
    #     - delete chunk
    #   - if 'EOF\n'
    #     - break
    #
    # TODO - This function
    # - wait for command to finish

    t_out = threading.Thread(
        target=_print_stdout, args=(process.stdout,))
    t_err = threading.Thread(
        target=_print_stderr, args=(process.stderr,))

    for t in (t_out, t_err):
        t.daemon = True
        t.start()

    receive_inform(process.stdin, socket_file, chunk_file_tmpl)

    returncode = process.wait()
    for t in (t_out, t_err):
        t.join()

    return returncode