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#!/usr/bin/env python3

# Copyright (c) 2009, Giampaolo Rodola'. All rights reserved.
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.

"""Iterate over all process PIDs and for each one of them invoke and
test all psutil.Process() methods.
"""

import enum
import errno
import multiprocessing
import os
import stat
import time
import traceback

import psutil
from psutil import AIX
from psutil import BSD
from psutil import FREEBSD
from psutil import LINUX
from psutil import MACOS
from psutil import NETBSD
from psutil import OPENBSD
from psutil import OSX
from psutil import POSIX
from psutil import WINDOWS
from psutil._compat import PY3
from psutil._compat import FileNotFoundError
from psutil._compat import long
from psutil._compat import unicode
from psutil.tests import CI_TESTING
from psutil.tests import QEMU_USER
from psutil.tests import VALID_PROC_STATUSES
from psutil.tests import PsutilTestCase
from psutil.tests import check_connection_ntuple
from psutil.tests import create_sockets
from psutil.tests import is_namedtuple
from psutil.tests import is_win_secure_system_proc
from psutil.tests import process_namespace
from psutil.tests import serialrun


# Cuts the time in half, but (e.g.) on macOS the process pool stays
# alive after join() (multiprocessing bug?), messing up other tests.
USE_PROC_POOL = LINUX and not CI_TESTING


def proc_info(pid):
    tcase = PsutilTestCase()

    def check_exception(exc, proc, name, ppid):
        tcase.assertEqual(exc.pid, pid)
        if exc.name is not None:
            tcase.assertEqual(exc.name, name)
        if isinstance(exc, psutil.ZombieProcess):
            tcase.assertProcessZombie(proc)
            if exc.ppid is not None:
                tcase.assertGreaterEqual(exc.ppid, 0)
                tcase.assertEqual(exc.ppid, ppid)
        elif isinstance(exc, psutil.NoSuchProcess):
            tcase.assertProcessGone(proc)
        str(exc)
        repr(exc)

    def do_wait():
        if pid != 0:
            try:
                proc.wait(0)
            except psutil.Error as exc:
                check_exception(exc, proc, name, ppid)

    try:
        proc = psutil.Process(pid)
    except psutil.NoSuchProcess:
        tcase.assertPidGone(pid)
        return {}
    try:
        d = proc.as_dict(['ppid', 'name'])
    except psutil.NoSuchProcess:
        tcase.assertProcessGone(proc)
    else:
        name, ppid = d['name'], d['ppid']
        info = {'pid': proc.pid}
        ns = process_namespace(proc)
        # We don't use oneshot() because in order not to fool
        # check_exception() in case of NSP.
        for fun, fun_name in ns.iter(ns.getters, clear_cache=False):
            try:
                info[fun_name] = fun()
            except psutil.Error as exc:
                check_exception(exc, proc, name, ppid)
                continue
        do_wait()
        return info


@serialrun
class TestFetchAllProcesses(PsutilTestCase):
    """Test which iterates over all running processes and performs
    some sanity checks against Process API's returned values.
    Uses a process pool to get info about all processes.
    """

    def setUp(self):
        psutil._set_debug(False)
        # Using a pool in a CI env may result in deadlock, see:
        # https://github.com/giampaolo/psutil/issues/2104
        if USE_PROC_POOL:
            self.pool = multiprocessing.Pool()

    def tearDown(self):
        psutil._set_debug(True)
        if USE_PROC_POOL:
            self.pool.terminate()
            self.pool.join()

    def iter_proc_info(self):
        # Fixes "can't pickle <function proc_info>: it's not the
        # same object as test_process_all.proc_info".
        from psutil.tests.test_process_all import proc_info

        if USE_PROC_POOL:
            return self.pool.imap_unordered(proc_info, psutil.pids())
        else:
            ls = []
            for pid in psutil.pids():
                ls.append(proc_info(pid))
            return ls

    def test_all(self):
        failures = []
        for info in self.iter_proc_info():
            for name, value in info.items():
                meth = getattr(self, name)
                try:
                    meth(value, info)
                except Exception:  # noqa: BLE001
                    s = '\n' + '=' * 70 + '\n'
                    s += "FAIL: name=test_%s, pid=%s, ret=%s\ninfo=%s\n" % (
                        name,
                        info['pid'],
                        repr(value),
                        info,
                    )
                    s += '-' * 70
                    s += "\n%s" % traceback.format_exc()
                    s = "\n".join((" " * 4) + i for i in s.splitlines()) + "\n"
                    failures.append(s)
                else:
                    if value not in (0, 0.0, [], None, '', {}):
                        assert value, value
        if failures:
            raise self.fail(''.join(failures))

    def cmdline(self, ret, info):
        self.assertIsInstance(ret, list)
        for part in ret:
            self.assertIsInstance(part, str)

    def exe(self, ret, info):
        self.assertIsInstance(ret, (str, unicode))
        self.assertEqual(ret.strip(), ret)
        if ret:
            if WINDOWS and not ret.endswith('.exe'):
                return  # May be "Registry", "MemCompression", ...
            assert os.path.isabs(ret), ret
            # Note: os.stat() may return False even if the file is there
            # hence we skip the test, see:
            # http://stackoverflow.com/questions/3112546/os-path-exists-lies
            if POSIX and os.path.isfile(ret):
                if hasattr(os, 'access') and hasattr(os, "X_OK"):
                    # XXX: may fail on MACOS
                    try:
                        assert os.access(ret, os.X_OK)
                    except AssertionError:
                        if os.path.exists(ret) and not CI_TESTING:
                            raise

    def pid(self, ret, info):
        self.assertIsInstance(ret, int)
        self.assertGreaterEqual(ret, 0)

    def ppid(self, ret, info):
        self.assertIsInstance(ret, (int, long))
        self.assertGreaterEqual(ret, 0)
        proc_info(ret)

    def name(self, ret, info):
        self.assertIsInstance(ret, (str, unicode))
        if WINDOWS and not ret and is_win_secure_system_proc(info['pid']):
            # https://github.com/giampaolo/psutil/issues/2338
            return
        # on AIX, "<exiting>" processes don't have names
        if not AIX:
            assert ret, repr(ret)

    def create_time(self, ret, info):
        self.assertIsInstance(ret, float)
        try:
            self.assertGreaterEqual(ret, 0)
        except AssertionError:
            # XXX
            if OPENBSD and info['status'] == psutil.STATUS_ZOMBIE:
                pass
            else:
                raise
        # this can't be taken for granted on all platforms
        # self.assertGreaterEqual(ret, psutil.boot_time())
        # make sure returned value can be pretty printed
        # with strftime
        time.strftime("%Y %m %d %H:%M:%S", time.localtime(ret))

    def uids(self, ret, info):
        assert is_namedtuple(ret)
        for uid in ret:
            self.assertIsInstance(uid, int)
            self.assertGreaterEqual(uid, 0)

    def gids(self, ret, info):
        assert is_namedtuple(ret)
        # note: testing all gids as above seems not to be reliable for
        # gid == 30 (nodoby); not sure why.
        for gid in ret:
            self.assertIsInstance(gid, int)
            if not MACOS and not NETBSD:
                self.assertGreaterEqual(gid, 0)

    def username(self, ret, info):
        self.assertIsInstance(ret, str)
        self.assertEqual(ret.strip(), ret)
        assert ret.strip()

    def status(self, ret, info):
        self.assertIsInstance(ret, str)
        assert ret, ret
        if QEMU_USER:
            # status does not work under qemu user
            return
        self.assertNotEqual(ret, '?')  # XXX
        self.assertIn(ret, VALID_PROC_STATUSES)

    def io_counters(self, ret, info):
        assert is_namedtuple(ret)
        for field in ret:
            self.assertIsInstance(field, (int, long))
            if field != -1:
                self.assertGreaterEqual(field, 0)

    def ionice(self, ret, info):
        if LINUX:
            self.assertIsInstance(ret.ioclass, int)
            self.assertIsInstance(ret.value, int)
            self.assertGreaterEqual(ret.ioclass, 0)
            self.assertGreaterEqual(ret.value, 0)
        else:  # Windows, Cygwin
            choices = [
                psutil.IOPRIO_VERYLOW,
                psutil.IOPRIO_LOW,
                psutil.IOPRIO_NORMAL,
                psutil.IOPRIO_HIGH,
            ]
            self.assertIsInstance(ret, int)
            self.assertGreaterEqual(ret, 0)
            self.assertIn(ret, choices)

    def num_threads(self, ret, info):
        self.assertIsInstance(ret, int)
        if WINDOWS and ret == 0 and is_win_secure_system_proc(info['pid']):
            # https://github.com/giampaolo/psutil/issues/2338
            return
        self.assertGreaterEqual(ret, 1)

    def threads(self, ret, info):
        self.assertIsInstance(ret, list)
        for t in ret:
            assert is_namedtuple(t)
            self.assertGreaterEqual(t.id, 0)
            self.assertGreaterEqual(t.user_time, 0)
            self.assertGreaterEqual(t.system_time, 0)
            for field in t:
                self.assertIsInstance(field, (int, float))

    def cpu_times(self, ret, info):
        assert is_namedtuple(ret)
        for n in ret:
            self.assertIsInstance(n, float)
            self.assertGreaterEqual(n, 0)
        # TODO: check ntuple fields

    def cpu_percent(self, ret, info):
        self.assertIsInstance(ret, float)
        assert 0.0 <= ret <= 100.0, ret

    def cpu_num(self, ret, info):
        self.assertIsInstance(ret, int)
        if FREEBSD and ret == -1:
            return
        self.assertGreaterEqual(ret, 0)
        if psutil.cpu_count() == 1:
            self.assertEqual(ret, 0)
        self.assertIn(ret, list(range(psutil.cpu_count())))

    def memory_info(self, ret, info):
        assert is_namedtuple(ret)
        for value in ret:
            self.assertIsInstance(value, (int, long))
            self.assertGreaterEqual(value, 0)
        if WINDOWS:
            self.assertGreaterEqual(ret.peak_wset, ret.wset)
            self.assertGreaterEqual(ret.peak_paged_pool, ret.paged_pool)
            self.assertGreaterEqual(ret.peak_nonpaged_pool, ret.nonpaged_pool)
            self.assertGreaterEqual(ret.peak_pagefile, ret.pagefile)

    def memory_full_info(self, ret, info):
        assert is_namedtuple(ret)
        total = psutil.virtual_memory().total
        for name in ret._fields:
            value = getattr(ret, name)
            self.assertIsInstance(value, (int, long))
            self.assertGreaterEqual(value, 0, msg=(name, value))
            if LINUX or OSX and name in ('vms', 'data'):
                # On Linux there are processes (e.g. 'goa-daemon') whose
                # VMS is incredibly high for some reason.
                continue
            self.assertLessEqual(value, total, msg=(name, value, total))

        if LINUX:
            self.assertGreaterEqual(ret.pss, ret.uss)

    def open_files(self, ret, info):
        self.assertIsInstance(ret, list)
        for f in ret:
            self.assertIsInstance(f.fd, int)
            self.assertIsInstance(f.path, str)
            self.assertEqual(f.path.strip(), f.path)
            if WINDOWS:
                self.assertEqual(f.fd, -1)
            elif LINUX:
                self.assertIsInstance(f.position, int)
                self.assertIsInstance(f.mode, str)
                self.assertIsInstance(f.flags, int)
                self.assertGreaterEqual(f.position, 0)
                self.assertIn(f.mode, ('r', 'w', 'a', 'r+', 'a+'))
                self.assertGreater(f.flags, 0)
            elif BSD and not f.path:
                # XXX see: https://github.com/giampaolo/psutil/issues/595
                continue
            assert os.path.isabs(f.path), f
            try:
                st = os.stat(f.path)
            except FileNotFoundError:
                pass
            else:
                assert stat.S_ISREG(st.st_mode), f

    def num_fds(self, ret, info):
        self.assertIsInstance(ret, int)
        self.assertGreaterEqual(ret, 0)

    def net_connections(self, ret, info):
        with create_sockets():
            self.assertEqual(len(ret), len(set(ret)))
            for conn in ret:
                assert is_namedtuple(conn)
                check_connection_ntuple(conn)

    def cwd(self, ret, info):
        self.assertIsInstance(ret, (str, unicode))
        self.assertEqual(ret.strip(), ret)
        if ret:
            assert os.path.isabs(ret), ret
            try:
                st = os.stat(ret)
            except OSError as err:
                if WINDOWS and psutil._psplatform.is_permission_err(err):
                    pass
                # directory has been removed in mean time
                elif err.errno != errno.ENOENT:
                    raise
            else:
                assert stat.S_ISDIR(st.st_mode)

    def memory_percent(self, ret, info):
        self.assertIsInstance(ret, float)
        assert 0 <= ret <= 100, ret

    def is_running(self, ret, info):
        self.assertIsInstance(ret, bool)

    def cpu_affinity(self, ret, info):
        self.assertIsInstance(ret, list)
        self.assertNotEqual(ret, [])
        cpus = list(range(psutil.cpu_count()))
        for n in ret:
            self.assertIsInstance(n, int)
            self.assertIn(n, cpus)

    def terminal(self, ret, info):
        self.assertIsInstance(ret, (str, type(None)))
        if ret is not None:
            assert os.path.isabs(ret), ret
            assert os.path.exists(ret), ret

    def memory_maps(self, ret, info):
        for nt in ret:
            self.assertIsInstance(nt.addr, str)
            self.assertIsInstance(nt.perms, str)
            self.assertIsInstance(nt.path, str)
            for fname in nt._fields:
                value = getattr(nt, fname)
                if fname == 'path':
                    if not value.startswith(("[", "anon_inode:")):
                        assert os.path.isabs(nt.path), nt.path
                        # commented as on Linux we might get
                        # '/foo/bar (deleted)'
                        # assert os.path.exists(nt.path), nt.path
                elif fname == 'addr':
                    assert value, repr(value)
                elif fname == 'perms':
                    if not WINDOWS:
                        assert value, repr(value)
                else:
                    self.assertIsInstance(value, (int, long))
                    self.assertGreaterEqual(value, 0)

    def num_handles(self, ret, info):
        self.assertIsInstance(ret, int)
        self.assertGreaterEqual(ret, 0)

    def nice(self, ret, info):
        self.assertIsInstance(ret, int)
        if POSIX:
            assert -20 <= ret <= 20, ret
        else:
            priorities = [
                getattr(psutil, x)
                for x in dir(psutil)
                if x.endswith('_PRIORITY_CLASS')
            ]
            self.assertIn(ret, priorities)
            if PY3:
                self.assertIsInstance(ret, enum.IntEnum)
            else:
                self.assertIsInstance(ret, int)

    def num_ctx_switches(self, ret, info):
        assert is_namedtuple(ret)
        for value in ret:
            self.assertIsInstance(value, (int, long))
            self.assertGreaterEqual(value, 0)

    def rlimit(self, ret, info):
        self.assertIsInstance(ret, tuple)
        self.assertEqual(len(ret), 2)
        self.assertGreaterEqual(ret[0], -1)
        self.assertGreaterEqual(ret[1], -1)

    def environ(self, ret, info):
        self.assertIsInstance(ret, dict)
        for k, v in ret.items():
            self.assertIsInstance(k, str)
            self.assertIsInstance(v, str)


class TestPidsRange(PsutilTestCase):
    """Given pid_exists() return value for a range of PIDs which may or
    may not exist, make sure that psutil.Process() and psutil.pids()
    agree with pid_exists(). This guarantees that the 3 APIs are all
    consistent with each other. See:
    https://github.com/giampaolo/psutil/issues/2359

    XXX - Note about Windows: it turns out there are some "hidden" PIDs
    which are not returned by psutil.pids() and are also not revealed
    by taskmgr.exe and ProcessHacker, still they can be instantiated by
    psutil.Process() and queried. One of such PIDs is "conhost.exe".
    Running as_dict() for it reveals that some Process() APIs
    erroneously raise NoSuchProcess, so we know we have problem there.
    Let's ignore this for now, since it's quite a corner case (who even
    imagined hidden PIDs existed on Windows?).
    """

    def setUp(self):
        psutil._set_debug(False)

    def tearDown(self):
        psutil._set_debug(True)

    def test_it(self):
        def is_linux_tid(pid):
            try:
                f = open("/proc/%s/status" % pid, "rb")
            except FileNotFoundError:
                return False
            else:
                with f:
                    for line in f:
                        if line.startswith(b"Tgid:"):
                            tgid = int(line.split()[1])
                            # If tgid and pid are different then we're
                            # dealing with a process TID.
                            return tgid != pid
                    raise ValueError("'Tgid' line not found")

        def check(pid):
            # In case of failure retry up to 3 times in order to avoid
            # race conditions, especially when running in a CI
            # environment where PIDs may appear and disappear at any
            # time.
            x = 3
            while True:
                exists = psutil.pid_exists(pid)
                try:
                    if exists:
                        psutil.Process(pid)
                        if not WINDOWS:  # see docstring
                            self.assertIn(pid, psutil.pids())
                    else:
                        # On OpenBSD thread IDs can be instantiated,
                        # and oneshot() succeeds, but other APIs fail
                        # with EINVAL.
                        if not OPENBSD:
                            with self.assertRaises(psutil.NoSuchProcess):
                                psutil.Process(pid)
                        if not WINDOWS:  # see docstring
                            self.assertNotIn(pid, psutil.pids())
                except (psutil.Error, AssertionError):
                    x -= 1
                    if x == 0:
                        raise
                else:
                    return

        for pid in range(1, 3000):
            if LINUX and is_linux_tid(pid):
                # On Linux a TID (thread ID) can be passed to the
                # Process class and is querable like a PID (process
                # ID). Skip it.
                continue
            with self.subTest(pid=pid):
                check(pid)


if __name__ == '__main__':
    from psutil.tests.runner import run_from_name

    run_from_name(__file__)