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"""
Sync QMP Wrapper
This class pretends to be qemu.qmp.QEMUMonitorProtocol.
"""
import asyncio
from typing import (
Any,
Awaitable,
Dict,
List,
Optional,
TypeVar,
Union,
)
import qemu.qmp
from .error import QMPError
from .protocol import Runstate, SocketAddrT
from .qmp_client import QMPClient
#: QMPMessage is an entire QMP message of any kind.
QMPMessage = Dict[str, Any]
#: QMPReturnValue is the 'return' value of a command.
QMPReturnValue = object
#: QMPObject is any object in a QMP message.
QMPObject = Dict[str, object]
# QMPMessage can be outgoing commands or incoming events/returns.
# QMPReturnValue is usually a dict/json object, but due to QAPI's
# 'returns-whitelist', it can actually be anything.
#
# {'return': {}} is a QMPMessage,
# {} is the QMPReturnValue.
# pylint: disable=missing-docstring
class QEMUMonitorProtocol(qemu.qmp.QEMUMonitorProtocol):
def __init__(self, address: SocketAddrT,
server: bool = False,
nickname: Optional[str] = None):
# pylint: disable=super-init-not-called
self._aqmp = QMPClient(nickname)
self._aloop = asyncio.get_event_loop()
self._address = address
self._timeout: Optional[float] = None
_T = TypeVar('_T')
def _sync(
self, future: Awaitable[_T], timeout: Optional[float] = None
) -> _T:
return self._aloop.run_until_complete(
asyncio.wait_for(future, timeout=timeout)
)
def _get_greeting(self) -> Optional[QMPMessage]:
if self._aqmp.greeting is not None:
# pylint: disable=protected-access
return self._aqmp.greeting._asdict()
return None
# __enter__ and __exit__ need no changes
# parse_address needs no changes
def connect(self, negotiate: bool = True) -> Optional[QMPMessage]:
self._aqmp.await_greeting = negotiate
self._aqmp.negotiate = negotiate
self._sync(
self._aqmp.connect(self._address)
)
return self._get_greeting()
def accept(self, timeout: Optional[float] = 15.0) -> QMPMessage:
self._aqmp.await_greeting = True
self._aqmp.negotiate = True
self._sync(
self._aqmp.accept(self._address),
timeout
)
ret = self._get_greeting()
assert ret is not None
return ret
def cmd_obj(self, qmp_cmd: QMPMessage) -> QMPMessage:
return dict(
self._sync(
# pylint: disable=protected-access
# _raw() isn't a public API, because turning off
# automatic ID assignment is discouraged. For
# compatibility with iotests *only*, do it anyway.
self._aqmp._raw(qmp_cmd, assign_id=False),
self._timeout
)
)
# Default impl of cmd() delegates to cmd_obj
def command(self, cmd: str, **kwds: object) -> QMPReturnValue:
return self._sync(
self._aqmp.execute(cmd, kwds),
self._timeout
)
def pull_event(self,
wait: Union[bool, float] = False) -> Optional[QMPMessage]:
if not wait:
# wait is False/0: "do not wait, do not except."
if self._aqmp.events.empty():
return None
# If wait is 'True', wait forever. If wait is False/0, the events
# queue must not be empty; but it still needs some real amount
# of time to complete.
timeout = None
if wait and isinstance(wait, float):
timeout = wait
return dict(
self._sync(
self._aqmp.events.get(),
timeout
)
)
def get_events(self, wait: Union[bool, float] = False) -> List[QMPMessage]:
events = [dict(x) for x in self._aqmp.events.clear()]
if events:
return events
event = self.pull_event(wait)
return [event] if event is not None else []
def clear_events(self) -> None:
self._aqmp.events.clear()
def close(self) -> None:
self._sync(
self._aqmp.disconnect()
)
def settimeout(self, timeout: Optional[float]) -> None:
self._timeout = timeout
def send_fd_scm(self, fd: int) -> None:
self._aqmp.send_fd_scm(fd)
def __del__(self) -> None:
if self._aqmp.runstate == Runstate.IDLE:
return
if not self._aloop.is_running():
self.close()
else:
# Garbage collection ran while the event loop was running.
# Nothing we can do about it now, but if we don't raise our
# own error, the user will be treated to a lot of traceback
# they might not understand.
raise QMPError(
"QEMUMonitorProtocol.close()"
" was not called before object was garbage collected"
)
|
