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lookup.py

import functools
import inspect
from typing import Any

from defence360agent.contracts.config import UserType
from defence360agent.utils import Scope

from .exceptions import RpcError

_RPC_MARK = "__rpc_command"

class DuplicateHandlerError(Exception):
    pass

class NotCoroutineError(Exception):
    pass

class Endpoints:
    """Endpoints class implements registration and lookup for functions
    implementing RPC calls."""

SCOPE = Scope.AV_IM360
    APPLICABLE_USER_TYPES = set()  # type: Set[str]
    __COMMAND_MAP = {
        UserType.ROOT: {},
        UserType.NON_ROOT: {},
    }  # type: Dict[str, Dict]
    _subclasses = []

def __init_subclass__(cls, **kwargs):
        super().__init_subclass__(**kwargs)
        cls._subclasses.append(cls)

@classmethod
    def get_active_endpoints(cls):
        # consider endpoint as active if it has at least one RPC call handler
        active_endpoints = []
        for subcls in cls._subclasses:
            rpc_handlers = inspect.getmembers(
                subcls, lambda item: getattr(item, _RPC_MARK, None)
            )
            if rpc_handlers:
                active_endpoints.append(subcls)
        return active_endpoints

def __init__(self, sink):
        self._sink = sink

@classmethod
    async def route_to_endpoint(cls, request, sink, user=UserType.ROOT) -> Any:
        """Find appropriate class and function within that class that
        implements processing for request based on supplied 'command' within.

Call that (async) function and return its result.

If target class/function for given request['command'] is not found then
        RpcError exception is raised."""
        command = request["command"]
        key = tuple(command)
        if key not in cls.__COMMAND_MAP[user]:
            raise RpcError(
                'Endpoint not found for RPC method "%s"'
                % " ".join(request["command"])
            )
        cls_handler, handler_name = cls.__COMMAND_MAP[user][key]
        handler = getattr(cls_handler(sink), handler_name)
        return await handler(**request["params"])

@classmethod
    def register_rpc_handlers(cls) -> None:
        """Registers RPC handlers for all functions within a class.

Functions should be decorated with @bind('command', ...)."""
        for name in dir(cls):
            if name.startswith("_"):
                continue
            attr = getattr(cls, name)
            command = getattr(attr, _RPC_MARK, None)
            if command is None:
                continue
            if not inspect.iscoroutinefunction(attr):
                raise NotCoroutineError("Must be a coroutine")
            for user_type in cls.APPLICABLE_USER_TYPES:
                if command in cls.__COMMAND_MAP[user_type]:
                    msg = (
                        "Duplicate handlers for command {} ({}): {} and {}"
                        .format(
                            command,
                            user_type,
                            cls.__COMMAND_MAP[user_type][command],
                            attr,
                        )
                    )
                    raise DuplicateHandlerError(msg)
                cls.__COMMAND_MAP[user_type][command] = (cls, name)

@classmethod
    def reset_rpc_handlers(cls):
        """Clears all previously made registrations."""
        for user_type in {UserType.NON_ROOT, UserType.ROOT}:
            cls.__COMMAND_MAP[user_type] = {}

class CommonEndpoints(Endpoints):
    """Endpoints available both for root and non root users."""

APPLICABLE_USER_TYPES = {UserType.NON_ROOT, UserType.ROOT}

class RootEndpoints(Endpoints):
    """Endpoints available only for root user."""

APPLICABLE_USER_TYPES = {UserType.ROOT}

class UserOnlyEndpoints(Endpoints):
    """Endpoints available only for non root users."""

APPLICABLE_USER_TYPES = {UserType.NON_ROOT}

LOOKUP_ASSIGNMENTS = functools.WRAPPER_ASSIGNMENTS + (_RPC_MARK,)

def wraps(
    wrapped, assigned=LOOKUP_ASSIGNMENTS, updated=functools.WRAPPER_UPDATES
):
    """Decorator replacing functools.wraps for rpc handlers"""
    return functools.partial(
        functools.update_wrapper,
        wrapped=wrapped,
        assigned=assigned,
        updated=updated,
    )

def bind(*command):
    """Mark a function as processing RPC calls for command."""

def decorator(func):
        setattr(func, _RPC_MARK, command)
        return func

return decorator

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Name	Type	Size	Owner/Group	Permission	Last Modified	Actions
.	dir	-	root/root	0755	2025-11-12 12:10:15
..	dir	-	root/root	0755	2025-11-12 12:10:15
__pycache__	dir	-	root/root	0755	2025-11-12 12:10:15
__init__.py	text/plain	694 B	root/root	0644	2025-10-16 12:33:02
exceptions.py	text/x-python	403 B	root/root	0644	2025-10-16 12:33:02
lookup.py	text/x-python	4.39 KB	root/root	0644	2025-10-16 12:33:02
middleware.py	text/x-python	5.8 KB	root/root	0644	2025-10-16 12:33:02
utils.py	text/x-python	4.25 KB	root/root	0644	2025-10-16 12:33:02
validate.py	text/x-python	6.3 KB	root/root	0644	2025-10-16 12:33:02