| 1 | # The MIT License (MIT) |
| 2 | # |
| 3 | # Copyright (c) 2017 Philippe Proulx <pproulx@efficios.com> |
| 4 | # |
| 5 | # Permission is hereby granted, free of charge, to any person obtaining a copy |
| 6 | # of this software and associated documentation files (the "Software"), to deal |
| 7 | # in the Software without restriction, including without limitation the rights |
| 8 | # to use, copy, modify, merge, publish, distribute, sublicense, and/or sell |
| 9 | # copies of the Software, and to permit persons to whom the Software is |
| 10 | # furnished to do so, subject to the following conditions: |
| 11 | # |
| 12 | # The above copyright notice and this permission notice shall be included in |
| 13 | # all copies or substantial portions of the Software. |
| 14 | # |
| 15 | # THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
| 16 | # IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
| 17 | # FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE |
| 18 | # AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
| 19 | # LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, |
| 20 | # OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN |
| 21 | # THE SOFTWARE. |
| 22 | |
| 23 | from bt2 import native_bt, object, utils |
| 24 | import bt2.notification |
| 25 | import collections.abc |
| 26 | import bt2.component |
| 27 | import bt2 |
| 28 | |
| 29 | |
| 30 | class _NotificationIterator(collections.abc.Iterator): |
| 31 | def _handle_status(self, status, gen_error_msg): |
| 32 | if status == native_bt.NOTIFICATION_ITERATOR_STATUS_CANCELED: |
| 33 | raise bt2.NotificationIteratorCanceled |
| 34 | elif status == native_bt.NOTIFICATION_ITERATOR_STATUS_AGAIN: |
| 35 | raise bt2.TryAgain |
| 36 | elif status == native_bt.NOTIFICATION_ITERATOR_STATUS_END: |
| 37 | raise bt2.Stop |
| 38 | elif status == native_bt.NOTIFICATION_ITERATOR_STATUS_UNSUPPORTED: |
| 39 | raise bt2.UnsupportedFeature |
| 40 | elif status < 0: |
| 41 | raise bt2.Error(gen_error_msg) |
| 42 | |
| 43 | def __next__(self): |
| 44 | raise NotImplementedError |
| 45 | |
| 46 | |
| 47 | class _GenericNotificationIterator(object._Object, _NotificationIterator): |
| 48 | def _get_notif(self): |
| 49 | notif_ptr = native_bt.notification_iterator_get_notification(self._ptr) |
| 50 | utils._handle_ptr(notif_ptr, "cannot get notification iterator object's current notification object") |
| 51 | return bt2.notification._create_from_ptr(notif_ptr) |
| 52 | |
| 53 | def _next(self): |
| 54 | status = native_bt.notification_iterator_next(self._ptr) |
| 55 | self._handle_status(status, |
| 56 | 'unexpected error: cannot advance the notification iterator') |
| 57 | |
| 58 | def __next__(self): |
| 59 | self._next() |
| 60 | return self._get_notif() |
| 61 | |
| 62 | |
| 63 | class _PrivateConnectionNotificationIterator(_GenericNotificationIterator): |
| 64 | @property |
| 65 | def component(self): |
| 66 | comp_ptr = native_bt.private_connection_notification_iterator_get_component(self._ptr) |
| 67 | assert(comp_ptr) |
| 68 | return bt2.component._create_generic_component_from_ptr(comp_ptr) |
| 69 | |
| 70 | |
| 71 | class _OutputPortNotificationIterator(_GenericNotificationIterator): |
| 72 | pass |
| 73 | |
| 74 | |
| 75 | class _UserNotificationIterator(_NotificationIterator): |
| 76 | def __new__(cls, ptr): |
| 77 | # User iterator objects are always created by the native side, |
| 78 | # that is, never instantiated directly by Python code. |
| 79 | # |
| 80 | # The native code calls this, then manually calls |
| 81 | # self.__init__() without the `ptr` argument. The user has |
| 82 | # access to self.component during this call, thanks to this |
| 83 | # self._ptr argument being set. |
| 84 | # |
| 85 | # self._ptr is NOT owned by this object here, so there's nothing |
| 86 | # to do in __del__(). |
| 87 | self = super().__new__(cls) |
| 88 | self._ptr = ptr |
| 89 | return self |
| 90 | |
| 91 | def __init__(self): |
| 92 | pass |
| 93 | |
| 94 | @property |
| 95 | def _component(self): |
| 96 | return native_bt.py3_get_user_component_from_user_notif_iter(self._ptr) |
| 97 | |
| 98 | @property |
| 99 | def addr(self): |
| 100 | return int(self._ptr) |
| 101 | |
| 102 | def _finalize(self): |
| 103 | pass |
| 104 | |
| 105 | def __next__(self): |
| 106 | raise bt2.Stop |
| 107 | |
| 108 | def _next_from_native(self): |
| 109 | # this can raise anything: it's catched by the native part |
| 110 | try: |
| 111 | notif = next(self) |
| 112 | except StopIteration: |
| 113 | raise bt2.Stop |
| 114 | except: |
| 115 | raise |
| 116 | |
| 117 | utils._check_type(notif, bt2.notification._Notification) |
| 118 | |
| 119 | # take a new reference for the native part |
| 120 | notif._get() |
| 121 | return int(notif._ptr) |