diff options
Diffstat (limited to 'python')
| -rw-r--r-- | python/qemu/aqmp/legacy.py | 98 |
1 files changed, 90 insertions, 8 deletions
diff --git a/python/qemu/aqmp/legacy.py b/python/qemu/aqmp/legacy.py index 10c7c99c4f..dfcd20bbd2 100644 --- a/python/qemu/aqmp/legacy.py +++ b/python/qemu/aqmp/legacy.py @@ -1,7 +1,13 @@ """ -Sync QMP Wrapper +(Legacy) Sync QMP Wrapper -This class pretends to be qemu.qmp.QEMUMonitorProtocol. +This module provides the `QEMUMonitorProtocol` class, which is a +synchronous wrapper around `QMPClient`. + +Its design closely resembles that of the original QEMUMonitorProtocol +class, originally written by Luiz Capitulino. It is provided here for +compatibility with scripts inside the QEMU source tree that expect the +old interface. """ # @@ -50,9 +56,6 @@ QMPObject = Dict[str, object] # {} is the QMPReturnValue. -# pylint: disable=missing-docstring - - class QMPBadPortError(QMPError): """ Unable to parse socket address: Port was non-numerical. @@ -60,6 +63,17 @@ class QMPBadPortError(QMPError): class QEMUMonitorProtocol: + """ + Provide an API to connect to QEMU via QEMU Monitor Protocol (QMP) + and then allow to handle commands and events. + + :param address: QEMU address, can be either a unix socket path (string) + or a tuple in the form ( address, port ) for a TCP + connection + :param server: Act as the socket server. (See 'accept') + :param nickname: Optional nickname used for logging. + """ + def __init__(self, address: SocketAddrT, server: bool = False, nickname: Optional[str] = None): @@ -121,6 +135,12 @@ class QEMUMonitorProtocol: return address def connect(self, negotiate: bool = True) -> Optional[QMPMessage]: + """ + Connect to the QMP Monitor and perform capabilities negotiation. + + :return: QMP greeting dict, or None if negotiate is false + :raise ConnectError: on connection errors + """ self._aqmp.await_greeting = negotiate self._aqmp.negotiate = negotiate @@ -130,6 +150,16 @@ class QEMUMonitorProtocol: return self._get_greeting() def accept(self, timeout: Optional[float] = 15.0) -> QMPMessage: + """ + Await connection from QMP Monitor and perform capabilities negotiation. + + :param timeout: + timeout in seconds (nonnegative float number, or None). + If None, there is no timeout, and this may block forever. + + :return: QMP greeting dict + :raise ConnectError: on connection errors + """ self._aqmp.await_greeting = True self._aqmp.negotiate = True @@ -140,6 +170,12 @@ class QEMUMonitorProtocol: return ret def cmd_obj(self, qmp_cmd: QMPMessage) -> QMPMessage: + """ + Send a QMP command to the QMP Monitor. + + :param qmp_cmd: QMP command to be sent as a Python dict + :return: QMP response as a Python dict + """ return dict( self._sync( # pylint: disable=protected-access @@ -158,9 +194,9 @@ class QEMUMonitorProtocol: """ Build a QMP command and send it to the QMP Monitor. - @param name: command name (string) - @param args: command arguments (dict) - @param cmd_id: command id (dict, list, string or int) + :param name: command name (string) + :param args: command arguments (dict) + :param cmd_id: command id (dict, list, string or int) """ qmp_cmd: QMPMessage = {'execute': name} if args: @@ -170,6 +206,9 @@ class QEMUMonitorProtocol: return self.cmd_obj(qmp_cmd) def command(self, cmd: str, **kwds: object) -> QMPReturnValue: + """ + Build and send a QMP command to the monitor, report errors if any + """ return self._sync( self._aqmp.execute(cmd, kwds), self._timeout @@ -177,6 +216,19 @@ class QEMUMonitorProtocol: def pull_event(self, wait: Union[bool, float] = False) -> Optional[QMPMessage]: + """ + Pulls a single event. + + :param wait: + If False or 0, do not wait. Return None if no events ready. + If True, wait forever until the next event. + Otherwise, wait for the specified number of seconds. + + :raise asyncio.TimeoutError: + When a timeout is requested and the timeout period elapses. + + :return: The first available QMP event, or None. + """ if not wait: # wait is False/0: "do not wait, do not except." if self._aqmp.events.empty(): @@ -197,6 +249,20 @@ class QEMUMonitorProtocol: ) def get_events(self, wait: Union[bool, float] = False) -> List[QMPMessage]: + """ + Get a list of QMP events and clear all pending events. + + :param wait: + If False or 0, do not wait. Return None if no events ready. + If True, wait until we have at least one event. + Otherwise, wait for up to the specified number of seconds for at + least one event. + + :raise asyncio.TimeoutError: + When a timeout is requested and the timeout period elapses. + + :return: A list of QMP events. + """ events = [dict(x) for x in self._aqmp.events.clear()] if events: return events @@ -205,17 +271,33 @@ class QEMUMonitorProtocol: return [event] if event is not None else [] def clear_events(self) -> None: + """Clear current list of pending events.""" self._aqmp.events.clear() def close(self) -> None: + """Close the connection.""" self._sync( self._aqmp.disconnect() ) def settimeout(self, timeout: Optional[float]) -> None: + """ + Set the timeout for QMP RPC execution. + + This timeout affects the `cmd`, `cmd_obj`, and `command` methods. + The `accept`, `pull_event` and `get_event` methods have their + own configurable timeouts. + + :param timeout: + timeout in seconds, or None. + None will wait indefinitely. + """ self._timeout = timeout def send_fd_scm(self, fd: int) -> None: + """ + Send a file descriptor to the remote via SCM_RIGHTS. + """ self._aqmp.send_fd_scm(fd) def __del__(self) -> None: |