How to use _current_handlers method in autotest

Best Python code snippet using autotest_python

MouseBehavior.py

Source:MouseBehavior.py

1"""2MouseBehavior.py3$Id$4TODO:5split into other files, one for class Tool*,6one for parse_command (rename to avoid confusion w/ user command package?), etc7"""8from pyglet.event import EVENT_HANDLED9from demoapp.foundation.description_utils import description_maker_for_methods_in_class10DEBUG_TRANSITIONS = False11# ==12class PlaceHolder(object): #refile13    """14    For singleton symbol-like instances which can be found and replaced15    wherever they occur in other values, and are never confused16    with ordinary values.17    """18    def __init__(self, name):19        self.name = name20    def __repr__(self):21        return self.name22    pass23CMD_RETVAL = PlaceHolder('CMD_RETVAL')24SAME_STATE = PlaceHolder('SAME_STATE')25# ==26NOOP = 'NOOP' # stub27     # unlike None, this means we stop at this object, never calling lower handlers28def parse_command(command): ### REFACTOR into this returning name, args, parse_tip, and parse_transition29    "return (name, args) for any command"30    #### DECIDE: what actually this is retval? event name???? in pane or model? which coords? (guess: model, model coords)31    # TODO: improve to have more return options, be a first class object -- really an expr (description of what to do)32    if type(command) is tuple:33        name, args = command[0], command[1:]34    elif command is None:35        return None, ()36    else:37        # any command with no args38        name, args = command, ()39    assert isinstance(name, type("")) #e improve40    return name, args41# ==42class Transition(object): # use superclass Description??43    """44    Describe a potential state transition, for use by something45    which might actually do it or might just indicate something46    about it in the UI.47    Note: callers are encouraged to supply these as named arguments for clarity,48    and to always supply them in this order, and to supply all of them49    (except for handled) even when they have their default values.50    @param indicators: tooltip and highlighting indicators, to show the user51                       what would happen if this transition was taken.52    @type indicators: sequence of HighlightGraphics_descriptions objects ###doc more53    @param command: what to do to the model when this transition is taken.54                    Can be None for "no operation".55    @type command: ('command name', *parameters )56    @param next_state: next state to go into, when this transition is taken.57                       Can be SAME_STATE to remain in the same state with the58                       same parameters. Can include CMD_RETVAL when the command59                       return value is needed as a parameter of the new state.60    @type next_state: ( state_class, *parameters)61    @param handled: whether a mouse event resulting in this transition being62                    indicated or taken has been fully handled (true) or needs63                    further handling by background event handlers (false)64    @type handled: boolean65    """66    def __init__(self,67                 indicators = (),68                 command = None,69                 next_state = None,70                 handled = True ):71        self.indicators = indicators72        self.command = command73        self.next_state = next_state74        self.handled = handled and EVENT_HANDLED ## technically: or None75        #e todo: also save file and line of caller, if a debug option is set,76        # and print this in tracebacks when processing this transition77        # (perhaps using a feature to store extra info in frames to be printed then?)78    pass79def parse_transition(transition):80    t = transition81    if t is None:82        return None, None, SAME_STATE, False # guesses, 080616 night83    return t.indicators, t.command, t.next_state, t.handled84def parse_state( state_desc):85    "return class, args"86    # maybe: use parse_description_tuple?87    # maybe optim: replacements at same time (as this or as instantiate_state)?88    if state_desc is None:89        return None, ()90    try:91        return state_desc[0], state_desc[1:]92    except:93        print "following exception was in parse_state(%r):" % (state_desc,)94        raise95    pass96def replace_symbols_in(desc, **replacements): # maybe: grab code from exprs for Symbols, to generalize97    res = desc98    if type(desc) is type(()):99        res = tuple([replace_symbols_in(x, **replacements) for x in desc])100    elif type(desc) is PlaceHolder:101        if desc.name in replacements:102            res = replacements[desc.name]103        pass104    # todo: dicts, lists105    # maybe: if res == desc: return desc106    return res107# ==108class ToolStateBehavior(object):109    #doc; related to MouseBehavior (is name ok? ToolState by itself seemed ambiguous...)110    """111    """112    _cmd_retval = None113    def __init__(self, tool):114        "subclasses typically have more init args"115        self.tool = tool116        self.pane = tool.pane # convenience for subclasses117        self.model = tool.pane.model118        return119    def transition_to(self, next_state):120        if next_state is not SAME_STATE:121            if DEBUG_TRANSITIONS:122                print "%r transto %r" % (self, next_state) ##### DEBUG123            self.tool.transition_to( next_state,124                                     CMD_RETVAL = self._cmd_retval )125            # maybe: might decide tool can grab it from self if needed (passed as an arg)126    pass127# ==128class Tool(object):129    """130    Subclasses are specific tools, not being used.131    Instances of subclases are uses of specific tools in specific panes.132    """133    # per-subclass constants134    _default_state = None135    HighlightGraphics_class = None136    # instance variables137    _current_handlers = None138    _f_HighlightGraphics_instance = None # (could probably be per-class)139    _f_HighlightGraphics_descriptions = None # (could probably be per-class)140    def __init__(self, pane):141        """142        @note: doesn't do self.activate()143        """144        self.pane = pane145        # optim (minor): the following could probably be cached per-class146        if self.HighlightGraphics_class:147            tool = self148            self._f_HighlightGraphics_instance = self.HighlightGraphics_class(tool)149            self._f_HighlightGraphics_descriptions = description_maker_for_methods_in_class( self.HighlightGraphics_class)150        pass151    def activate(self, initial_state = None):152        """153        @note: doesn't deactivate other tools on self.pane154        """155        self.transition_to(initial_state or self._default_state)156        return157    def deactivate(self):158        self.remove_state_handlers()159        return160    def remove_state_handlers(self):161        if self._current_handlers:162            self.pane.remove_handlers(self._current_handlers)163            self._current_handlers = None164        return165    def transition_to(self, next_state, **replacements):166        self.remove_state_handlers()167        next_state = replace_symbols_in( next_state, **replacements )168        new_handlers = self.instantiate_state( next_state)169        self.push_state_handlers( new_handlers)170        # review: would this be better if it could call a new171        # replace_handlers method on EventDispatcher172        # (so as to insert them at the same stack level as before)?173        # not sure whether this ever matters in practice...174        # yes, it does matter -- I tried putting some controls on top175        # of the tool area, but that fails from the start, since the176        # first toolstate ends up on top of them.177        return178    def push_state_handlers(self, new_handlers):179        self.pane.push_handlers(new_handlers)180        self._current_handlers = new_handlers181        return182    def instantiate_state(self, state):183        try:184            assert state, "state must not be %r" % (state,)185            state_class, state_args = parse_state(state)186            assert issubclass( state_class, ToolStateBehavior ), \187                   "%r should be a subclass of ToolStateBehavior" % (state_class,)188            res = state_class( self, *state_args)189            return res190        except:191            print "following exception is in %r.instantiate_state(%r):" % (self, state)192            raise193        pass...

core.py

Source:core.py

1import libyang2import logging3import asyncio4import os5import time6from .server_connector import create_server_connector7from .errors import InvalArgError, InternalError, UnsupportedError8from .util import call9logger = logging.getLogger(__name__)10DEFAULT_REVERT_TIMEOUT = int(os.getenv("GOLDSTONE_DEFAULT_REVERT_TIMEOUT", 6))11class ChangeHandler(object):12    def __init__(self, server, change):13        self.server = server14        self.change = change15        self.type = self.change.type16    def setup_cache(self, user):17        cache = user.get("cache")18        if not user.get("cache"):19            cache = self.server.conn.get_config_cache(user["changes"])20            user["cache"] = cache21        return cache22    def validate(self, user):23        pass24    def apply(self, user):25        pass26    def revert(self, user):27        pass28NoOp = ChangeHandler29class ServerBase(object):30    def __init__(self, conn, module, revert_timeout=DEFAULT_REVERT_TIMEOUT):31        self.conn = create_server_connector(conn, module)32        self.handlers = {}33        self._current_handlers = None  # (req_id, handlers, user)34        self._stop_event = asyncio.Event()35        self.revert_timeout = revert_timeout36        self.lock = asyncio.Lock()37    def get_running_data(38        self, xpath, default=None, strip=True, include_implicit_defaults=False39    ):40        return self.conn.get(41            xpath,42            default=default,43            strip=strip,44            include_implicit_defaults=include_implicit_defaults,45        )46    def get_operational_data(47        self, xpath, default=None, strip=True, include_implicit_defaults=False48    ):49        return self.conn.get_operational(50            xpath,51            default=default,52            strip=strip,53            include_implicit_defaults=include_implicit_defaults,54        )55    def get_handler(self, xpath):56        xpath = libyang.xpath_split(xpath)57        cursor = self.handlers58        for x in xpath:59            v = cursor.get(x[1])60            if v == None:61                return None62            if type(v) == type and issubclass(v, ChangeHandler):63                return v64            cursor = v65        return NoOp66    async def start(self):67        self.conn.subscribe_module_change(self.change_cb)68        self.conn.subscribe_oper_data_request(self._oper_cb)69        return [self._stop_event.wait()]70    def stop(self):71        self._stop_event.set()72        self.conn.stop()73    async def reconcile(self):74        logger.debug("reconcile")75    # In Goldstone Management Layer, one model is subcribed by one Server.76    # When a sysrepo transction only includes changes for one model, 'abort' event77    # never happens. However, when a sysrepo transaction includes changes for more than one model,78    # change_cb() may get an 'abort' event if error happens in a change_cb() of other servers.79    #80    # We store the handlers created in the 'change' event, and discard them if we get a succeeding 'done' event.81    # If we get 'abort' event, call revert() of the stored handlers then discard them.82    #83    # - 'change' event handling84    #   - 1. iterate through the changes, do basic validation, degenerate changes if possible85    #   - 2. do the actual change handling, if any error happens, revert the changes made in advance and raise error86    #   - 3. store the handlers for 'abort' event87    # - 'done' event handling88    #   - 1. discard the stored handlers89    # - 'abort' event handling90    #   - 1. call revert() of the stored handlers91    #   - 2. discard the stored handlers92    #93    # ## Client side timeout handling94    # When timeout of client expired during 'change' event handling, sysrepo doesn't issue any event.95    # We create a task that waits for "done" or "abort" event after finishing "change" event handling.96    # If no event arrives within certain amount of time, assume it as client timeout happens then clal revert()97    # of the stored handlers.98    # If "done" or "abort" event arrives within the time window, cancel this task.99    async def change_cb(self, event, req_id, changes, priv):100        logger.debug(f"id: {req_id}, event: {event}, changes: {changes}")101        async with self.lock:102            if event not in ["change", "done", "abort"]:103                logger.warning(f"unsupported event: {event}")104                return105            if event in ["done", "abort"]:106                if self._current_handlers == None:107                    logger.error(f"current_handlers is null")108                    self._stop_event.set()109                    raise InternalError("fatal error happened")110                id, handlers, user, revert_task = self._current_handlers111                revert_task.cancel()112                try:113                    await revert_task114                except asyncio.CancelledError:115                    pass116                if id != req_id:117                    logger.error(f"{id=} != {req_id=}")118                    self._stop_event.set()119                    raise InternalError("fatal error happened")120                if event == "abort":121                    for done in reversed(handlers):122                        await call(done.revert, user)123                self._current_handlers = None124                return125            if self._current_handlers != None:126                id, handlers, user, revert_task = self._current_handlers127                raise InternalError(128                    f"waiting 'done' or 'abort' event for id {id}. got '{event}' event for id {req_id}"129                )130            handlers = []131            user = {"changes": changes}132            await call(self.pre, user)133            for change in changes:134                cls = self.get_handler(change.xpath)135                if not cls:136                    if change.type == "deleted":137                        continue138                    raise UnsupportedError(f"{change.xpath} not supported")139                h = cls(self, change)140                # to support async initialization141                init = getattr(h, "_init", None)142                if init:143                    await call(init, user)144                await call(h.validate, user)145                handlers.append(h)146            for i, handler in enumerate(handlers):147                try:148                    await call(handler.apply, user)149                except Exception as e:150                    for done in reversed(handlers[:i]):151                        await call(done.revert, user)152                    raise e153            await call(self.post, user)154            async def do_revert():155                await asyncio.sleep(self.revert_timeout)156                logging.warning("client timeout happens? reverting changes we made")157                for done in reversed(handlers):158                    await call(done.revert, user)159                self._current_handlers = None160            revert_task = asyncio.create_task(do_revert())161            self._current_handlers = (req_id, handlers, user, revert_task)162    def pre(self, user):163        pass164    def post(self, user):165        pass166    async def _oper_cb(self, xpath, priv):167        logger.debug(f"xpath: {xpath}")168        time_start = time.perf_counter_ns()169        data = await call(self.oper_cb, xpath, priv)170        time_end = time.perf_counter_ns()171        elapsed = (time_end - time_start) / 1000_1000_10172        logger.debug(f"xpath: {xpath}, elapsed: {elapsed}sec")173        return data174    def oper_cb(self, xpath, priv):175        pass176    def send_notification(self, name, notification):...

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