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#! /usr/bin/python3

# SPDX-License-Identifier: GPL-2.0-or-later
#
# tasst - Test A Simple Socket Transport
#         library of test helpers for passt & pasta
#
# tasst/site.py - Manage simulated network sites for testing
#
# Copyright Red Hat
# Author: David Gibson <david@gibson.dropbear.id.au>

import contextlib
import json

import avocado
from avocado.utils.process import CmdError

from tasst import Tasst


class Site(contextlib.AbstractContextManager):
    """
    A (usually virtual or simulated) location where we can execute
    commands and configure networks.

    """

    def __init__(self, name):
        self.name = name # For debugging

    def __enter__(self):
        raise NotImplementedError

    def __exit__(self, *exc_details):
        raise NotImplementedError

    def output(self, cmd, **kwargs):
        raise NotImplementedError

    def fg(self, cmd, **kwargs):
        self.output(cmd, **kwargs)

    def bg(self, cmd, **kwargs):
        raise NotImplementedError

    def require_cmds(self, *cmds):
        missing = [c for c in cmds
                   if self.fg('type {}'.format(c), ignore_status=True) != 0]
        if missing:
            raise avocado.TestCancel("Missing commands {} on {}"
                                     .format(', '.join(missing), self.name))

    def ifs(self):
        self.require_cmds('ip')
        info = json.loads(self.output('ip -j link show'))
        return [i['ifname'] for i in info]


class SiteTasst(Tasst):
    """
    Basic tests for executing commands on sites

    :avocado: disable
    :avocado: tags=meta
    """
    timeout = 1.0

    # Derived classes must redefine this
    def setup_site(self):
        raise NotImplementedError("{} must implement setup_site() method".format(type(self).__name__))

    def test_true(self):
        with self.setup_site() as site:
            site.fg('true')

    def test_false(self):
        with self.setup_site() as site:
            self.assertRaises(CmdError, site.fg, 'false')

    def test_echo(self):
        with self.setup_site() as site:
            s = 'Hello tasst'
            out = site.output('echo {}'.format(s))
            self.assertEquals(out, s.encode('utf-8'))

    def test_bg_true(self):
        with self.setup_site() as site:
            with site.bg('true') as proc:
                status = proc.wait()
                self.assertEquals(status, 0)

    def test_bg_false(self):
        with self.setup_site() as site:
            with site.bg('false') as proc:
                status = proc.wait()
                self.assertNotEquals(status, 0)

    def test_has_lo(self):
        with self.setup_site() as site:
            self.assertIn('lo', site.ifs())


# Represents the host on which the tests are running, as opposed to
# some simulated host created by the tests
class RealHost(Site):
    def __init__(self):
        super().__init__('REAL_HOST')

    def __enter__(self):
        return self

    def __exit__(self, *exc_details):
        pass

    def output(self, cmd, sudo=False, **kwargs):
        assert not sudo, "BUG: Shouldn't run commands with privilege on host"
        return avocado.utils.process.system_output(cmd, **kwargs)

    def fg(self, cmd, sudo=False, **kwargs):
        assert not sudo, "BUG: Shouldn't run commands with privilege on host"
        return avocado.utils.process.system(cmd, **kwargs)

    @contextlib.contextmanager
    def bg(self, cmd, sudo=False, **kwargs):
        assert not sudo, "BUG: Shouldn't run commands with privilege on host"
        try:
            proc = avocado.utils.process.SubProcess(cmd, **kwargs)
            proc.start()
            yield proc
        finally:
            proc.stop()


REAL_HOST = RealHost()


class RealHostTasst(SiteTasst):
    def setup_site(self):
        return REAL_HOST


debug log:

solving 6450944 ...
found 6450944 in https://archives.passt.top/passt-dev/20230531015849.3229596-9-david@gibson.dropbear.id.au/
found 6aa83c4 in https://archives.passt.top/passt-dev/20230531015849.3229596-8-david@gibson.dropbear.id.au/
found 415a953 in https://archives.passt.top/passt-dev/20230531015849.3229596-5-david@gibson.dropbear.id.au/

applying [1/3] https://archives.passt.top/passt-dev/20230531015849.3229596-5-david@gibson.dropbear.id.au/
diff --git a/avocado/tasst/site.py b/avocado/tasst/site.py
new file mode 100644
index 0000000..415a953


applying [2/3] https://archives.passt.top/passt-dev/20230531015849.3229596-8-david@gibson.dropbear.id.au/
diff --git a/avocado/tasst/site.py b/avocado/tasst/site.py
index 415a953..6aa83c4 100644


applying [3/3] https://archives.passt.top/passt-dev/20230531015849.3229596-9-david@gibson.dropbear.id.au/
diff --git a/avocado/tasst/site.py b/avocado/tasst/site.py
index 6aa83c4..6450944 100644

Checking patch avocado/tasst/site.py...
3:112: new blank line at EOF.
+
Applied patch avocado/tasst/site.py cleanly.
Checking patch avocado/tasst/site.py...
Applied patch avocado/tasst/site.py cleanly.
Checking patch avocado/tasst/site.py...
Applied patch avocado/tasst/site.py cleanly.
warning: 1 line adds whitespace errors.

index at:
100644 64509449483c0949d044efdf4ee9bd18573e04e7	avocado/tasst/site.py

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