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editing: backup.py

"""
This program is free software: you can redistribute it and/or modify it under
the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License,
or (at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. 
See the GNU General Public License for more details.

You should have received a copy of the GNU General Public License
 along with this program.  If not, see <https://www.gnu.org/licenses/>.

This software is also available under ImunifyAV commercial license,
see <https://www.imunify360.com/legal/eula>
"""
import asyncio
import logging
import time

from defence360agent.contracts.config import BackupConfig
from defence360agent.contracts.license import LicenseCLN
from defence360agent.internals.cln import CLNError
from defence360agent.rpc_tools import ValidationError
from defence360agent.rpc_tools.lookup import CommonEndpoints, bind, wraps
from defence360agent.subsys.backup_systems import (
    Acronis,
    BackupException,
    CloudLinux,
    CloudLinuxBase,
    CloudLinuxOnPremise,
    R1Soft,
    get_available_backends_names,
    get_backend,
)
from defence360agent.utils import Scope, Singleton

logger = logging.getLogger(__name__)

CLN_RESPONSE_ERROR = """
Error with one of the next reasons:
* Not found linked backup for the server
* Not found linked cloudlinux user for the server
* IP of server is different in last time
"""

PLAIN_AUTH_FIELDS = {
    "username": "Username should be provided",
    "password": "Password should be provided",
}
REQUIRED_FIELDS = {
    Acronis: PLAIN_AUTH_FIELDS,
    R1Soft: {
        "encryption_key": "Encryption key should be provided",
        "ip": "IP should be provided",
        **PLAIN_AUTH_FIELDS,
    },
    CloudLinuxOnPremise: PLAIN_AUTH_FIELDS,
}

def validate_backend_args(f):
    @wraps(f)
    async def wrapper(*args, **kwargs):
        required_options = REQUIRED_FIELDS.get(kwargs["backend"], {})
        errors = [
            error_msg
            for field, error_msg in required_options.items()
            if not kwargs.get(field)
        ]
        if errors:
            raise ValidationError("\n".join(errors))

return await f(*args, **kwargs)

return wrapper

class BackupEndpoints(CommonEndpoints, metaclass=Singleton):
    SCOPE = Scope.IM360

NOT_RUNNING, INIT, BACKUP, DONE = "not_running", "init", "backup", "done"

def __init__(self, sink):
        super().__init__(sink)
        self._status = self.NOT_RUNNING
        self._current_backend = self._error = None
        self._init_task = self._backup_task = None
        self._backup_started_time = 0

@property
    def _backup_pending(self):
        return time.time() - self._backup_started_time < 60 * 5

@validate_backend_args
    @bind("backup-systems", "init")
    async def init(self, backend, **kwargs):
        if LicenseCLN.is_demo():
            raise ValidationError("This action is not allowed in demo version")
        loop = asyncio.get_event_loop()
        if self._current_backend and not self._error:
            if self._status == self.INIT:
                raise ValidationError(
                    "Backup initialization is already in progress"
                )
            if self._status == self.BACKUP:
                raise ValidationError("Backup process is already in progress")

logger.info("Starting init task")
        # flush error from previous sessions
        self._error = None
        self._task = loop.create_task(backend.init(**kwargs))
        self._task.add_done_callback(self._init_task_done)
        self._status = self.INIT
        self._current_backend = backend
        return "Backup initialization process is in progress"

async def _set_current_backend(self, conf):
        if not self._current_backend and conf["backup_system"]:
            self._current_backend = get_backend(conf["backup_system"])

if self._status == self.NOT_RUNNING:
                # if backup exists, assuming all done
                if await self._current_backend.check_state():
                    self._status = self.DONE
                else:
                    self._error = "No backups found!"

async def _include_init_stages_info(self, status):
        if status["state"] != self.INIT:
            advanced_data = await self._current_backend.show()
            status.update(advanced_data)
        if (
            isinstance(self._current_backend, CloudLinuxBase)
            and self._status == self.BACKUP
        ):
            if self._error is not None:
                if await self._current_backend.check_state():
                    # error should already be fixed,
                    # because there is some backups
                    self._error = None
                    status["state"] = self._status = self.DONE
            else:
                progress = await self._current_backend.get_backup_progress()
                if progress is None:
                    if self._backup_pending:
                        status["progress"] = 0
                    else:
                        # if there is no progress after a while
                        # let's admit backup is completed
                        status["state"] = self._status = self.DONE
                else:
                    status["progress"] = progress

return status

async def _get_advanced_status(self, status):
        await self._set_current_backend(status)

status["state"] = self._status
        status["error"] = self._error
        status["log_path"] = getattr(self._current_backend, "log_path", None)
        status["backup_system"] = getattr(self._current_backend, "name", None)

if self._error is not None and self._status == self.INIT:
            self._error = self._current_backend = None
            self._status = self.NOT_RUNNING

if self._current_backend:
            try:
                status = await self._include_init_stages_info(status)
            except asyncio.CancelledError:
                raise
            except Exception as e:
                # Ignoring "No backup for host" errors for 5 minutes
                if "No backup for host" in str(e) and self._backup_pending:
                    logger.info(
                        "Error %s will be ignored for 5 minutes "
                        "after init state has been finished",
                        e,
                    )
                # want to show human friendly error if backup is unpaid
                elif self._current_backend == CloudLinux:
                    resp = await self._current_backend.check()
                    if resp.get("status") == CloudLinux.UNPAID:
                        status["error"] = (
                            "Backup is unpaid! Please, check "
                            "it out in your CLN account."
                        )
                else:
                    raise e

return status

@bind("backup-systems", "extended-status")
    async def extended_status(self):
        status = BackupConfig().config_to_dict().get("BACKUP_SYSTEM", {})
        status = await self._get_advanced_status(status)

return {"items": status}

@bind("backup-systems", "status")
    async def status(self, user=None):
        status = BackupConfig().config_to_dict().get("BACKUP_SYSTEM", {})
        return {"items": status}

@bind("backup-systems", "list")
    async def list(self):
        return get_available_backends_names()

@bind("backup-systems", "disable")
    async def disable(self, backend, **kwargs):
        self._current_backend = self._error = None
        self._status = self.NOT_RUNNING
        await backend.disable(**kwargs)

@bind("backup-systems", "check")
    async def check(self, backend):
        try:
            return {"items": await backend.check()}
        except CLNError:
            raise ValidationError(CLN_RESPONSE_ERROR)
        except (LookupError, RuntimeError) as e:
            raise ValidationError(str(e)) from e

def _init_task_done(self, future):
        logger.info("In init done callback")
        e = future.exception()
        if e is not None:
            if isinstance(e, CLNError):
                self._error = CLN_RESPONSE_ERROR
            else:
                logger.exception("Backup init task failed", exc_info=e)
                self._error = str(e)
        else:
            logger.info("Starting initial backup task")
            self._status = self.BACKUP
            self._backup_started_time = time.time()
            self._backup_task = asyncio.get_event_loop().create_task(
                self._current_backend.make_backup()
            )
            self._backup_task.add_done_callback(self._backup_task_done)

def _backup_task_done(self, future):
        logger.info("In backup done callback")
        e = future.exception()
        if e is not None:
            logger.exception("Initial backup task failed", exc_info=e)
            if isinstance(e, BackupException):
                self._error = str(e)
            else:
                self._error = "Unknown error: " + str(e)
        else:
            self._status = self.DONE

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