contrib/automation/hgautomation/winrm.py

rust: switch hg-core and hg-cpython to rust 2018 edition

Many interesting changes have happened in Rust since the Oxidation Plan was
introduced, like the 2018 edition and procedural macros:

    - Opting in to the 2018 edition is a clear benefit in terms of future
      proofing, new (nice to have) syntactical sugar notwithstanding. It
      also has a new non-lexical, non-AST based borrow checker that has
      fewer bugs(!) and allows us to write correct code that in some cases
      would have been rejected by the old one.
    - Procedural macros allow us to use the PyO3 crate which maintainers have
      expressed the clear goal of compiling on stable, which would help in
      code maintainability compared to rust-cpython.

In this patch are the following changes:
    - Removing most `extern crate` uses
    - Updating `use` clauses (`crate` keyword, nested `use`)
    - Removing `mod.rs` in favor of an aptly named module file

Like discussed in the mailing list (
https://www.mercurial-scm.org/pipermail/mercurial-devel/2019-July/132316.html
), until Rust integration in Mercurial is considered to be out of the
experimental phase, the maximum version of Rust allowed is whatever the latest
version Debian packages.

Differential Revision: https://phab.mercurial-scm.org/D6597

# winrm.py - Interact with Windows Remote Management (WinRM)
#
# Copyright 2019 Gregory Szorc <[e-mail]>
#
# This software may be used and distributed according to the terms of the
# GNU General Public License version 2 or any later version.

# no-check-code because Python 3 native.

import logging
import pprint
import time

from pypsrp.client import (
    Client,
)
from pypsrp.powershell import (
    PowerShell,
    PSInvocationState,
    RunspacePool,
)
import requests.exceptions


logger = logging.getLogger(__name__)


def wait_for_winrm(host, username, password, timeout=180, ssl=False):
    """Wait for the Windows Remoting (WinRM) service to become available.

    Returns a ``psrpclient.Client`` instance.
    """

    end_time = time.time() + timeout

    while True:
        try:
            client = Client(host, username=username, password=password,
                            ssl=ssl, connection_timeout=5)
            client.execute_cmd('echo "hello world"')
            return client
        except requests.exceptions.ConnectionError:
            if time.time() >= end_time:
                raise

            time.sleep(1)


def format_object(o):
    if isinstance(o, str):
        return o

    try:
        o = str(o)
    except TypeError:
        o = pprint.pformat(o.extended_properties)

    return o


def run_powershell(client, script):
    with RunspacePool(client.wsman) as pool:
        ps = PowerShell(pool)
        ps.add_script(script)

        ps.begin_invoke()

        while ps.state == PSInvocationState.RUNNING:
            ps.poll_invoke()
            for o in ps.output:
                print(format_object(o))

            ps.output[:] = []

        ps.end_invoke()

        for o in ps.output:
            print(format_object(o))

        if ps.state == PSInvocationState.FAILED:
            raise Exception('PowerShell execution failed: %s' %
                            ' '.join(map(format_object, ps.streams.error)))