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Current File : /opt/cloudlinux/venv/lib64/python3.11/site-packages/clwizard//wizard.py
# coding=utf-8
#
# Copyright © Cloud Linux GmbH & Cloud Linux Software, Inc 2010-2021 All Rights Reserved
#
# Licensed under CLOUD LINUX LICENSE AGREEMENT
# http://cloudlinux.com/docs/LICENCE.TXT
#
import json
import os
import sys
import time
import traceback
from typing import Any, Optional, Dict, NoReturn  # NOQA

import psutil

from clcommon import FormattedException
from clcommon.utils import (
    run_command,
    ExternalProgramFailed,
    get_cl_version,
)
from clcommon.utils import get_package_db_errors, is_ubuntu
from clwizard.config import NoSuchModule

from .config import acquire_config_access
from .config import Config  # NOQA
from .modules import run_installation, ALL_MODULES, get_supported_modules
from .constants import (
    WizardStatus,
    ModuleStatus,
    CRASH_LOG_PATH,
    FILE_MARKER_PATH,
    MAIN_LOG_PATH,
)
from .exceptions import CancelModuleException, InstallationFailedException
from .parser import parse_cloudlinux_wizard_opts
from .utils import (
    is_background_process_running,
    run_background,
    setup_logger,
)


class CloudlinuxWizard:
    """Main class for working with Wizard that exposes high level logic."""

    # states in which we can remove the module from queue
    CANCELLABLE_MODULE_STATUSES = [
        ModuleStatus.PENDING,
        ModuleStatus.FAILED,
        ModuleStatus.CANCELLED,
    ]

    # modules states in which wizard modules can be considered as done
    DONE_MODULES_STATUSES = [
        ModuleStatus.INSTALLED,
        ModuleStatus.CANCELLED,
        ModuleStatus.AUTO_SKIPPED,
    ]

    def __init__(self):
        self._opts = None
        self._supported_modules = get_supported_modules()
        self.log = setup_logger("wizard.main", MAIN_LOG_PATH)

    def run(self, argv):
        """
        CL Wizard main function
        :param argv: command line arguments for wizard
        :return: None
        """
        self._opts = parse_cloudlinux_wizard_opts(argv)
        try:
            if self._opts.subparser == "install":
                self._validate_system()
                if self.is_installation_finished() and not self._opts.force:
                    self._print_result_and_exit(
                        result="Installation already finished", exit_code=1
                    )
                self._prepare_for_installation()
                if self._opts.no_async:
                    run_installation()
                else:
                    self.run_background_installation(options=self._opts.json_data)
            elif self._opts.subparser == "status":
                self._validate_system()
                if self._opts.initial:
                    self._get_initial_status()
                else:
                    self._get_modules_statuses()
            elif self._opts.subparser == "cancel":
                self._cancel_module_installation(self._opts.module)
            elif self._opts.subparser == "finish":
                self.create_completion_marker()
            else:
                raise NotImplementedError

            if (
                self._opts.subparser in ["install", "cancel"]
                and self.is_all_modules_installed()
            ) or (
                self._opts.subparser == "finish" and not self.is_all_modules_installed()
            ):
                # Called only once if:
                #  -- in case of an install:   -all modules were installed successfully
                #                              -a module failed during installation,
                #                              but was installed after resuming
                #  -- in case of cancelling:   -a module failed during installation,
                #                              but was canceled by the user and as a result,
                #                              all modules in a 'done' status
                #  -- in case of finish:       -only if user closed the wizard while a module
                #                              had a status other than installed, cancelled or skipped
                self.run_collecting_statistics()
                self.run_cagefs_force_update()

            self._print_result_and_exit()
        except FormattedException as err:
            self.log.error(
                "Got an error while running cloudlinux-wizard, message: '%s'", str(err)
            )
            self._print_result_and_exit(
                result=err.message, context=err.context, details=err.details, exit_code=1
            )
        except InstallationFailedException:
            self._print_result_and_exit(
                result="Module installation failed, see the log for more information",
                exit_code=1,
            )
        except Exception as err:
            self.log.exception("Unknown error in cloudlinux-wizard, %s", str(err))
            self._print_result_and_exit(
                result="Unknown error occured, please, try again "
                "or contact CloudLinux support if it persists.",
                details=traceback.format_exc(),
            )

    @staticmethod
    def is_installation_finished():
        # type: () -> bool
        return os.path.isfile(FILE_MARKER_PATH)

    def create_completion_marker(self):
        # type: () -> None
        try:
            os.mknod(FILE_MARKER_PATH)
            self.log.info("Wizard execution complete")
        except (OSError, IOError) as err:
            self.log.warning(
                "Wizard 'finish' command called more than once, error: '%s'", str(err)
            )
            self._print_result_and_exit(
                result="Wizard 'finish' command called more than once", exit_code=1
            )

    def run_background_installation(self, options=None):
        # type: (Optional[Dict]) -> Optional[None]
        cmd = sys.argv[:]
        cmd.append("--no-async")
        with acquire_config_access() as config:
            # two processes cannot use config at same time
            # so we can safely do check for running process here
            if is_background_process_running():
                self._print_result_and_exit(
                    result="Unable to start a new installation because "
                    "a background task is still working",
                    exit_code=1,
                )
            # the only case when options are None is the 'resume' case
            if options is not None:
                config.set_modules(options)
            # worker will not be able to acquire reading lock
            # and will wait unless we finally close config file
            worker_pid = run_background(cmd).pid
            config.worker_pid = worker_pid
        self._print_result_and_exit(result="success", pid=worker_pid)

    def _validate_system(self):
        """
        Check that wizard supports current system
        """
        if get_cl_version() is None:
            self._print_result_and_exit(
                result="Could not identify the CloudLinux version. "
                "Restart your system. If you have the same problem again - "
                "contact CloudLinux support."
            )

    def _prepare_for_installation(self):
        """
        Prepare the enviroment before performing the installation.
        This function updates the package lists if run on Ubuntu, expires Yum
        cache when running on RHEL-based systems.
        """
        if is_ubuntu():
            cmd = ["apt-get", "-q", "update"]
            try:
                out = run_command(cmd)
                self.log.info("apt-get update output:\n%s", out)
            except ExternalProgramFailed as err:
                self.log.error("Error during apt-get update: '%s'", err, exc_info=err)
        else:
            cmd = ["yum", "-qy", "clean", "expire-cache"]
            try:
                out = run_command(cmd)
                self.log.info("yum clean expire-cache output:\n%s", out)
            except ExternalProgramFailed as err:
                self.log.error("Error during yum clean expire-cache: '%s'", err, exc_info=err)


    def _get_module_log_path(self, module_name):
        """Get path to module log file"""
        return self._supported_modules[module_name].LOG_FILE

    def _get_modules_statuses(self):
        """
        Get information about background worker state
        """
        # we should return modules in order, but config
        # does not know about it, let's sort modules here
        modules = []
        with acquire_config_access() as config:
            state = self._get_wizard_state(config)
            for name in self._supported_modules:
                try:
                    status = config.get_module_status(name)
                    status_time = config.get_module_status_time(name)
                except NoSuchModule:
                    continue
                module_status = {
                    "status": status,
                    "name": name,
                    "status_time": status_time,
                }
                if status in [ModuleStatus.FAILED, ModuleStatus.AUTO_SKIPPED]:
                    module_status["log_file"] = self._get_module_log_path(name)
                modules.append(module_status)
        if state == WizardStatus.CRASHED:
            self._print_result_and_exit(
                wizard_status=state, modules=modules, crash_log=CRASH_LOG_PATH
            )
        self._print_result_and_exit(wizard_status=state, modules=modules)

    def _get_initial_status(self):
        """
        Get initial modules status that is used
        by lvemanager to display wizard pages
        """
        error_message = get_package_db_errors()
        if error_message:
            # package manager DB corrupted
            self._print_result_and_exit(result=error_message)
        else:
            self._print_result_and_exit(
                modules={
                    module_name: cls().initial_status()
                    for module_name, cls in self._supported_modules.items()
                },
                unsuppored_by_cp=list(set(ALL_MODULES) - set(self._supported_modules)),
            )

    def _cancel_module_installation(self, module):
        # type: (str) -> Optional[None]
        """Remove module from queue or print the error if it's not possible"""
        self.log.info("Trying to cancel the installation of module '%s'", module)
        with acquire_config_access() as config:
            status = config.get_module_status(module)
            if status in self.CANCELLABLE_MODULE_STATUSES:
                config.set_module_status(
                    module_name=module, new_state=ModuleStatus.CANCELLED
                )
                self.log.info("Module '%s' installation successfully canceled", module)
            else:
                self.log.warning(
                    "Unable to cancel module '%s' installation, "
                    "because it is in status '%s'",
                    module,
                    status,
                )
                raise CancelModuleException(module, status)

    def run_collecting_statistics(self):
        """
        Collects user`s statistics
        """
        cmd = ["/usr/sbin/cloudlinux-summary", "--send"]
        if not os.environ.get("SYNCHRONOUS_SUMMARY"):
            cmd.append("--async")

        self.log.info("Collecting statistics...")
        try:
            out = run_command(cmd)
            self.log.info("Statistics collection command output: '%s'", out)
        except ExternalProgramFailed as err:
            self.log.error("Error during statistics collection: '%s'", err)

    def is_all_modules_installed(self):
        # type: () -> bool
        """
        Check that all modules were either:
        -- installed
        -- canceled
        -- or auto-skipped
        """
        with acquire_config_access() as config:
            statuses = list(config.statuses.values())
        return all(status in self.DONE_MODULES_STATUSES for status in statuses)

    def run_cagefs_force_update(self):
        """
        Runs cagefsctl --force-update in background
        """
        cagefsctl_bin = "/usr/sbin/cagefsctl"

        if not os.path.isfile(cagefsctl_bin):
            return
        cmd = [cagefsctl_bin, "--force-update", "--wait-lock"]
        self.log.info("Starting cagefs force-update in the background: %s", cmd)
        cagefsctl_proc = run_background(cmd)
        # In Cloudlinux tests environment statistics wait for cagefsctl --force-update terminate
        is_test_environment = bool(os.environ.get("CL_TEST_SYSTEM"))
        if is_test_environment:
            cagefsctl_proc.communicate()

    def _get_wizard_state(self, config):
        # type: (Config) -> str
        # worker pid is None only in the case when wizard
        # wasn't EVER called, this worker pid will stay
        # in config forever, even after wizard is Done
        if config.worker_pid is None:
            return WizardStatus.IDLE

        try:
            psutil.Process(config.worker_pid)
        except psutil.NoSuchProcess:
            # Background process is no longer alive.
            # 1. Wizard DONE: all modules are in state "installed", "cancelled" or "auto-skipped".
            # 2. Wizard FAILED: one of the modules in state "failed" or "cancelled"
            # and no modules are in status "installing"
            # 3. Wizard CRASHED: none of the above.
            statuses = list(config.statuses.values())
            if all(status in self.DONE_MODULES_STATUSES for status in statuses):
                return WizardStatus.DONE
            # cancel module`s status is acceptable for general wizard status FAILED, DO NOT CHANGE IT PLS (LU-1295)
            # An extra check for "installing" status is needed to exclude possible CRASHED wizard status
            if any(
                    status in (ModuleStatus.FAILED, ModuleStatus.CANCELLED)
                    for status in statuses
            ) and not any(status in (ModuleStatus.INSTALLING,) for status in statuses):
                return WizardStatus.FAILED
            return WizardStatus.CRASHED

        return WizardStatus.IN_PROGRESS

    @staticmethod
    def _print_result_and_exit(result="success", exit_code=0, **extra):
        # type: (str, int, **Any) -> NoReturn
        """
        Print data in default format for web and exit
        :param dict extra: extra fields for the response,
                           usually we expect 'context' here
        """
        message = {"result": result, "timestamp": time.time()}
        message.update(extra)
        print(json.dumps(message, indent=2, sort_keys=True))
        sys.exit(exit_code)

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