| 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.message_iterator |
| 25 | import collections.abc |
| 26 | import bt2.value |
| 27 | import traceback |
| 28 | import bt2.port |
| 29 | import sys |
| 30 | import bt2 |
| 31 | import os |
| 32 | |
| 33 | |
| 34 | # This class wraps a component class pointer. This component class could |
| 35 | # have been created by Python code, but since we only have the pointer, |
| 36 | # we can only wrap it in a generic way and lose the original Python |
| 37 | # class. |
| 38 | # |
| 39 | # Subclasses must implement some methods that this base class uses: |
| 40 | # |
| 41 | # - _bt_as_component_class_ptr: static method, convert the passed component class |
| 42 | # pointer to a 'bt_component_class *'. |
| 43 | |
| 44 | |
| 45 | class _GenericComponentClass(object._SharedObject): |
| 46 | @property |
| 47 | def name(self): |
| 48 | ptr = self._bt_as_component_class_ptr(self._ptr) |
| 49 | name = native_bt.component_class_get_name(ptr) |
| 50 | assert name is not None |
| 51 | return name |
| 52 | |
| 53 | @property |
| 54 | def description(self): |
| 55 | ptr = self._bt_as_component_class_ptr(self._ptr) |
| 56 | return native_bt.component_class_get_description(ptr) |
| 57 | |
| 58 | @property |
| 59 | def help(self): |
| 60 | ptr = self._bt_as_component_class_ptr(self._ptr) |
| 61 | return native_bt.component_class_get_help(ptr) |
| 62 | |
| 63 | def _bt_component_class_ptr(self): |
| 64 | return self._bt_as_component_class_ptr(self._ptr) |
| 65 | |
| 66 | def __eq__(self, other): |
| 67 | if not isinstance(other, _GenericComponentClass): |
| 68 | try: |
| 69 | if not issubclass(other, _UserComponent): |
| 70 | return False |
| 71 | except TypeError: |
| 72 | return False |
| 73 | |
| 74 | return self.addr == other.addr |
| 75 | |
| 76 | |
| 77 | class _GenericSourceComponentClass(_GenericComponentClass): |
| 78 | _get_ref = staticmethod(native_bt.component_class_source_get_ref) |
| 79 | _put_ref = staticmethod(native_bt.component_class_source_put_ref) |
| 80 | _bt_as_component_class_ptr = staticmethod( |
| 81 | native_bt.component_class_source_as_component_class |
| 82 | ) |
| 83 | |
| 84 | |
| 85 | class _GenericFilterComponentClass(_GenericComponentClass): |
| 86 | _get_ref = staticmethod(native_bt.component_class_filter_get_ref) |
| 87 | _put_ref = staticmethod(native_bt.component_class_filter_put_ref) |
| 88 | _bt_as_component_class_ptr = staticmethod( |
| 89 | native_bt.component_class_filter_as_component_class |
| 90 | ) |
| 91 | |
| 92 | |
| 93 | class _GenericSinkComponentClass(_GenericComponentClass): |
| 94 | _get_ref = staticmethod(native_bt.component_class_sink_get_ref) |
| 95 | _put_ref = staticmethod(native_bt.component_class_sink_put_ref) |
| 96 | _bt_as_component_class_ptr = staticmethod( |
| 97 | native_bt.component_class_sink_as_component_class |
| 98 | ) |
| 99 | |
| 100 | |
| 101 | class _PortIterator(collections.abc.Iterator): |
| 102 | def __init__(self, comp_ports): |
| 103 | self._comp_ports = comp_ports |
| 104 | self._at = 0 |
| 105 | |
| 106 | def __next__(self): |
| 107 | if self._at == len(self._comp_ports): |
| 108 | raise StopIteration |
| 109 | |
| 110 | comp_ports = self._comp_ports |
| 111 | comp_ptr = comp_ports._component_ptr |
| 112 | |
| 113 | port_ptr = comp_ports._borrow_port_ptr_at_index(comp_ptr, self._at) |
| 114 | assert port_ptr is not None |
| 115 | |
| 116 | name = native_bt.port_get_name(comp_ports._port_pycls._as_port_ptr(port_ptr)) |
| 117 | assert name is not None |
| 118 | |
| 119 | self._at += 1 |
| 120 | return name |
| 121 | |
| 122 | |
| 123 | class _ComponentPorts(collections.abc.Mapping): |
| 124 | |
| 125 | # component_ptr is a bt_component_source *, bt_component_filter * or |
| 126 | # bt_component_sink *. Its type must match the type expected by the |
| 127 | # functions passed as arguments. |
| 128 | |
| 129 | def __init__( |
| 130 | self, |
| 131 | component_ptr, |
| 132 | borrow_port_ptr_by_name, |
| 133 | borrow_port_ptr_at_index, |
| 134 | get_port_count, |
| 135 | port_pycls, |
| 136 | ): |
| 137 | self._component_ptr = component_ptr |
| 138 | self._borrow_port_ptr_by_name = borrow_port_ptr_by_name |
| 139 | self._borrow_port_ptr_at_index = borrow_port_ptr_at_index |
| 140 | self._get_port_count = get_port_count |
| 141 | self._port_pycls = port_pycls |
| 142 | |
| 143 | def __getitem__(self, key): |
| 144 | utils._check_str(key) |
| 145 | port_ptr = self._borrow_port_ptr_by_name(self._component_ptr, key) |
| 146 | |
| 147 | if port_ptr is None: |
| 148 | raise KeyError(key) |
| 149 | |
| 150 | return self._port_pycls._create_from_ptr_and_get_ref(port_ptr) |
| 151 | |
| 152 | def __len__(self): |
| 153 | count = self._get_port_count(self._component_ptr) |
| 154 | assert count >= 0 |
| 155 | return count |
| 156 | |
| 157 | def __iter__(self): |
| 158 | return _PortIterator(self) |
| 159 | |
| 160 | |
| 161 | # This class holds the methods which are common to both generic |
| 162 | # component objects and Python user component objects. |
| 163 | # |
| 164 | # Subclasses must provide these methods or property: |
| 165 | # |
| 166 | # - _bt_borrow_component_class_ptr: static method, must return a pointer to the |
| 167 | # specialized component class (e.g. 'bt_component_class_sink *') of the |
| 168 | # passed specialized component pointer (e.g. 'bt_component_sink *'). |
| 169 | # - _bt_comp_cls_type: property, one of the native_bt.COMPONENT_CLASS_TYPE_* |
| 170 | # constants. |
| 171 | # - _bt_as_component_ptr: static method, must return the passed specialized |
| 172 | # component pointer (e.g. 'bt_component_sink *') as a 'bt_component *'. |
| 173 | |
| 174 | |
| 175 | class _Component: |
| 176 | @property |
| 177 | def name(self): |
| 178 | ptr = self._bt_as_component_ptr(self._ptr) |
| 179 | name = native_bt.component_get_name(ptr) |
| 180 | assert name is not None |
| 181 | return name |
| 182 | |
| 183 | @property |
| 184 | def logging_level(self): |
| 185 | ptr = self._bt_as_component_ptr(self._ptr) |
| 186 | return native_bt.component_get_logging_level(ptr) |
| 187 | |
| 188 | @property |
| 189 | def cls(self): |
| 190 | cc_ptr = self._bt_borrow_component_class_ptr(self._ptr) |
| 191 | assert cc_ptr is not None |
| 192 | return _create_component_class_from_ptr_and_get_ref( |
| 193 | cc_ptr, self._bt_comp_cls_type |
| 194 | ) |
| 195 | |
| 196 | def __eq__(self, other): |
| 197 | if not hasattr(other, 'addr'): |
| 198 | return False |
| 199 | |
| 200 | return self.addr == other.addr |
| 201 | |
| 202 | |
| 203 | class _SourceComponent(_Component): |
| 204 | _bt_borrow_component_class_ptr = staticmethod( |
| 205 | native_bt.component_source_borrow_class_const |
| 206 | ) |
| 207 | _bt_comp_cls_type = native_bt.COMPONENT_CLASS_TYPE_SOURCE |
| 208 | _bt_as_component_class_ptr = staticmethod( |
| 209 | native_bt.component_class_source_as_component_class |
| 210 | ) |
| 211 | _bt_as_component_ptr = staticmethod(native_bt.component_source_as_component_const) |
| 212 | |
| 213 | |
| 214 | class _FilterComponent(_Component): |
| 215 | _bt_borrow_component_class_ptr = staticmethod( |
| 216 | native_bt.component_filter_borrow_class_const |
| 217 | ) |
| 218 | _bt_comp_cls_type = native_bt.COMPONENT_CLASS_TYPE_FILTER |
| 219 | _bt_as_component_class_ptr = staticmethod( |
| 220 | native_bt.component_class_filter_as_component_class |
| 221 | ) |
| 222 | _bt_as_component_ptr = staticmethod(native_bt.component_filter_as_component_const) |
| 223 | |
| 224 | |
| 225 | class _SinkComponent(_Component): |
| 226 | _bt_borrow_component_class_ptr = staticmethod( |
| 227 | native_bt.component_sink_borrow_class_const |
| 228 | ) |
| 229 | _bt_comp_cls_type = native_bt.COMPONENT_CLASS_TYPE_SINK |
| 230 | _bt_as_component_class_ptr = staticmethod( |
| 231 | native_bt.component_class_sink_as_component_class |
| 232 | ) |
| 233 | _bt_as_component_ptr = staticmethod(native_bt.component_sink_as_component_const) |
| 234 | |
| 235 | |
| 236 | # This is analogous to _GenericSourceComponentClass, but for source |
| 237 | # component objects. |
| 238 | class _GenericSourceComponent(object._SharedObject, _SourceComponent): |
| 239 | _get_ref = staticmethod(native_bt.component_source_get_ref) |
| 240 | _put_ref = staticmethod(native_bt.component_source_put_ref) |
| 241 | |
| 242 | @property |
| 243 | def output_ports(self): |
| 244 | return _ComponentPorts( |
| 245 | self._ptr, |
| 246 | native_bt.component_source_borrow_output_port_by_name_const, |
| 247 | native_bt.component_source_borrow_output_port_by_index_const, |
| 248 | native_bt.component_source_get_output_port_count, |
| 249 | bt2.port._OutputPort, |
| 250 | ) |
| 251 | |
| 252 | |
| 253 | # This is analogous to _GenericFilterComponentClass, but for filter |
| 254 | # component objects. |
| 255 | class _GenericFilterComponent(object._SharedObject, _FilterComponent): |
| 256 | _get_ref = staticmethod(native_bt.component_filter_get_ref) |
| 257 | _put_ref = staticmethod(native_bt.component_filter_put_ref) |
| 258 | |
| 259 | @property |
| 260 | def output_ports(self): |
| 261 | return _ComponentPorts( |
| 262 | self._ptr, |
| 263 | native_bt.component_filter_borrow_output_port_by_name_const, |
| 264 | native_bt.component_filter_borrow_output_port_by_index_const, |
| 265 | native_bt.component_filter_get_output_port_count, |
| 266 | bt2.port._OutputPort, |
| 267 | ) |
| 268 | |
| 269 | @property |
| 270 | def input_ports(self): |
| 271 | return _ComponentPorts( |
| 272 | self._ptr, |
| 273 | native_bt.component_filter_borrow_input_port_by_name_const, |
| 274 | native_bt.component_filter_borrow_input_port_by_index_const, |
| 275 | native_bt.component_filter_get_input_port_count, |
| 276 | bt2.port._InputPort, |
| 277 | ) |
| 278 | |
| 279 | |
| 280 | # This is analogous to _GenericSinkComponentClass, but for sink |
| 281 | # component objects. |
| 282 | class _GenericSinkComponent(object._SharedObject, _SinkComponent): |
| 283 | _get_ref = staticmethod(native_bt.component_sink_get_ref) |
| 284 | _put_ref = staticmethod(native_bt.component_sink_put_ref) |
| 285 | |
| 286 | @property |
| 287 | def input_ports(self): |
| 288 | return _ComponentPorts( |
| 289 | self._ptr, |
| 290 | native_bt.component_sink_borrow_input_port_by_name_const, |
| 291 | native_bt.component_sink_borrow_input_port_by_index_const, |
| 292 | native_bt.component_sink_get_input_port_count, |
| 293 | bt2.port._InputPort, |
| 294 | ) |
| 295 | |
| 296 | |
| 297 | _COMP_CLS_TYPE_TO_GENERIC_COMP_PYCLS = { |
| 298 | native_bt.COMPONENT_CLASS_TYPE_SOURCE: _GenericSourceComponent, |
| 299 | native_bt.COMPONENT_CLASS_TYPE_FILTER: _GenericFilterComponent, |
| 300 | native_bt.COMPONENT_CLASS_TYPE_SINK: _GenericSinkComponent, |
| 301 | } |
| 302 | |
| 303 | |
| 304 | _COMP_CLS_TYPE_TO_GENERIC_COMP_CLS_PYCLS = { |
| 305 | native_bt.COMPONENT_CLASS_TYPE_SOURCE: _GenericSourceComponentClass, |
| 306 | native_bt.COMPONENT_CLASS_TYPE_FILTER: _GenericFilterComponentClass, |
| 307 | native_bt.COMPONENT_CLASS_TYPE_SINK: _GenericSinkComponentClass, |
| 308 | } |
| 309 | |
| 310 | |
| 311 | # Create a component Python object of type _GenericSourceComponent, |
| 312 | # _GenericFilterComponent or _GenericSinkComponent, depending on |
| 313 | # comp_cls_type. |
| 314 | # |
| 315 | # Steals the reference to ptr from the caller. |
| 316 | |
| 317 | |
| 318 | def _create_component_from_ptr(ptr, comp_cls_type): |
| 319 | return _COMP_CLS_TYPE_TO_GENERIC_COMP_PYCLS[comp_cls_type]._create_from_ptr(ptr) |
| 320 | |
| 321 | |
| 322 | # Same as the above, but acquire a new reference instead of stealing the |
| 323 | # reference from the caller. |
| 324 | |
| 325 | |
| 326 | def _create_component_from_ptr_and_get_ref(ptr, comp_cls_type): |
| 327 | return _COMP_CLS_TYPE_TO_GENERIC_COMP_PYCLS[ |
| 328 | comp_cls_type |
| 329 | ]._create_from_ptr_and_get_ref(ptr) |
| 330 | |
| 331 | |
| 332 | # Create a component class Python object of type |
| 333 | # _GenericSourceComponentClass, _GenericFilterComponentClass or |
| 334 | # _GenericSinkComponentClass, depending on comp_cls_type. |
| 335 | # |
| 336 | # Acquires a new reference to ptr. |
| 337 | |
| 338 | |
| 339 | def _create_component_class_from_ptr_and_get_ref(ptr, comp_cls_type): |
| 340 | return _COMP_CLS_TYPE_TO_GENERIC_COMP_CLS_PYCLS[ |
| 341 | comp_cls_type |
| 342 | ]._create_from_ptr_and_get_ref(ptr) |
| 343 | |
| 344 | |
| 345 | def _trim_docstring(docstring): |
| 346 | lines = docstring.expandtabs().splitlines() |
| 347 | indent = sys.maxsize |
| 348 | |
| 349 | for line in lines[1:]: |
| 350 | stripped = line.lstrip() |
| 351 | |
| 352 | if stripped: |
| 353 | indent = min(indent, len(line) - len(stripped)) |
| 354 | |
| 355 | trimmed = [lines[0].strip()] |
| 356 | |
| 357 | if indent < sys.maxsize: |
| 358 | for line in lines[1:]: |
| 359 | trimmed.append(line[indent:].rstrip()) |
| 360 | |
| 361 | while trimmed and not trimmed[-1]: |
| 362 | trimmed.pop() |
| 363 | |
| 364 | while trimmed and not trimmed[0]: |
| 365 | trimmed.pop(0) |
| 366 | |
| 367 | return '\n'.join(trimmed) |
| 368 | |
| 369 | |
| 370 | # Metaclass for component classes defined by Python code. |
| 371 | # |
| 372 | # The Python user can create a standard Python class which inherits one |
| 373 | # of the three base classes (_UserSourceComponent, _UserFilterComponent, |
| 374 | # or _UserSinkComponent). Those base classes set this class |
| 375 | # (_UserComponentType) as their metaclass. |
| 376 | # |
| 377 | # Once the body of a user-defined component class is executed, this |
| 378 | # metaclass is used to create and initialize the class. The metaclass |
| 379 | # creates a native BT component class of the corresponding type and |
| 380 | # associates it with this user-defined class. The metaclass also defines |
| 381 | # class methods like the `name` and `description` properties to match |
| 382 | # the _GenericComponentClass interface. |
| 383 | # |
| 384 | # The component class name which is used is either: |
| 385 | # |
| 386 | # * The `name` parameter of the class: |
| 387 | # |
| 388 | # class MySink(bt2.SinkComponent, name='my-custom-sink'): |
| 389 | # ... |
| 390 | # |
| 391 | # * If the `name` class parameter is not used: the name of the class |
| 392 | # itself (`MySink` in the example above). |
| 393 | # |
| 394 | # The component class description which is used is the user-defined |
| 395 | # class's docstring: |
| 396 | # |
| 397 | # class MySink(bt2.SinkComponent): |
| 398 | # 'Description goes here' |
| 399 | # ... |
| 400 | # |
| 401 | # A user-defined Python component class can have an __init__() method |
| 402 | # which must at least accept the `params` and `name` arguments: |
| 403 | # |
| 404 | # def __init__(self, params, name, something_else): |
| 405 | # ... |
| 406 | # |
| 407 | # The user-defined component class can also have a _finalize() method |
| 408 | # (do NOT use __del__()) to be notified when the component object is |
| 409 | # finalized. |
| 410 | # |
| 411 | # User-defined source and filter component classes must use the |
| 412 | # `message_iterator_class` class parameter to specify the |
| 413 | # message iterator class to use for this component class: |
| 414 | # |
| 415 | # class MyMessageIterator(bt2._UserMessageIterator): |
| 416 | # ... |
| 417 | # |
| 418 | # class MySource(bt2._UserSourceComponent, |
| 419 | # message_iterator_class=MyMessageIterator): |
| 420 | # ... |
| 421 | # |
| 422 | # This message iterator class must inherit |
| 423 | # bt2._UserMessageIterator, and it must define the _get() and |
| 424 | # _next() methods. The message iterator class can also define an |
| 425 | # __init__() method: this method has access to the original Python |
| 426 | # component object which was used to create it as the `component` |
| 427 | # property. The message iterator class can also define a |
| 428 | # _finalize() method (again, do NOT use __del__()): this is called when |
| 429 | # the message iterator is (really) destroyed. |
| 430 | # |
| 431 | # When the user-defined class is destroyed, this metaclass's __del__() |
| 432 | # method is called: the native BT component class pointer is put (not |
| 433 | # needed anymore, at least not by any Python code since all references |
| 434 | # are dropped for __del__() to be called). |
| 435 | class _UserComponentType(type): |
| 436 | # __new__() is used to catch custom class parameters |
| 437 | def __new__(meta_cls, class_name, bases, attrs, **kwargs): |
| 438 | return super().__new__(meta_cls, class_name, bases, attrs) |
| 439 | |
| 440 | def __init__(cls, class_name, bases, namespace, **kwargs): |
| 441 | super().__init__(class_name, bases, namespace) |
| 442 | |
| 443 | # skip our own bases; they are never directly instantiated by the user |
| 444 | own_bases = ( |
| 445 | '_UserComponent', |
| 446 | '_UserFilterSinkComponent', |
| 447 | '_UserSourceComponent', |
| 448 | '_UserFilterComponent', |
| 449 | '_UserSinkComponent', |
| 450 | ) |
| 451 | |
| 452 | if class_name in own_bases: |
| 453 | return |
| 454 | |
| 455 | comp_cls_name = kwargs.get('name', class_name) |
| 456 | utils._check_str(comp_cls_name) |
| 457 | comp_cls_descr = None |
| 458 | comp_cls_help = None |
| 459 | |
| 460 | if hasattr(cls, '__doc__') and cls.__doc__ is not None: |
| 461 | utils._check_str(cls.__doc__) |
| 462 | docstring = _trim_docstring(cls.__doc__) |
| 463 | lines = docstring.splitlines() |
| 464 | |
| 465 | if len(lines) >= 1: |
| 466 | comp_cls_descr = lines[0] |
| 467 | |
| 468 | if len(lines) >= 3: |
| 469 | comp_cls_help = '\n'.join(lines[2:]) |
| 470 | |
| 471 | iter_cls = kwargs.get('message_iterator_class') |
| 472 | |
| 473 | if _UserSourceComponent in bases: |
| 474 | _UserComponentType._bt_set_iterator_class(cls, iter_cls) |
| 475 | cc_ptr = native_bt.bt2_component_class_source_create( |
| 476 | cls, comp_cls_name, comp_cls_descr, comp_cls_help |
| 477 | ) |
| 478 | elif _UserFilterComponent in bases: |
| 479 | _UserComponentType._bt_set_iterator_class(cls, iter_cls) |
| 480 | cc_ptr = native_bt.bt2_component_class_filter_create( |
| 481 | cls, comp_cls_name, comp_cls_descr, comp_cls_help |
| 482 | ) |
| 483 | elif _UserSinkComponent in bases: |
| 484 | if not hasattr(cls, '_consume'): |
| 485 | raise bt2.IncompleteUserClass( |
| 486 | "cannot create component class '{}': missing a _consume() method".format( |
| 487 | class_name |
| 488 | ) |
| 489 | ) |
| 490 | |
| 491 | cc_ptr = native_bt.bt2_component_class_sink_create( |
| 492 | cls, comp_cls_name, comp_cls_descr, comp_cls_help |
| 493 | ) |
| 494 | else: |
| 495 | raise bt2.IncompleteUserClass( |
| 496 | "cannot find a known component class base in the bases of '{}'".format( |
| 497 | class_name |
| 498 | ) |
| 499 | ) |
| 500 | |
| 501 | if cc_ptr is None: |
| 502 | raise bt2._MemoryError( |
| 503 | "cannot create component class '{}'".format(class_name) |
| 504 | ) |
| 505 | |
| 506 | cls._bt_cc_ptr = cc_ptr |
| 507 | |
| 508 | def _bt_init_from_native(cls, comp_ptr, params_ptr): |
| 509 | # create instance, not user-initialized yet |
| 510 | self = cls.__new__(cls) |
| 511 | |
| 512 | # pointer to native self component object (weak/borrowed) |
| 513 | self._bt_ptr = comp_ptr |
| 514 | |
| 515 | # call user's __init__() method |
| 516 | if params_ptr is not None: |
| 517 | params = bt2.value._create_from_ptr_and_get_ref(params_ptr) |
| 518 | else: |
| 519 | params = None |
| 520 | |
| 521 | self.__init__(params) |
| 522 | return self |
| 523 | |
| 524 | def __call__(cls, *args, **kwargs): |
| 525 | raise RuntimeError( |
| 526 | 'cannot directly instantiate a user component from a Python module' |
| 527 | ) |
| 528 | |
| 529 | @staticmethod |
| 530 | def _bt_set_iterator_class(cls, iter_cls): |
| 531 | if iter_cls is None: |
| 532 | raise bt2.IncompleteUserClass( |
| 533 | "cannot create component class '{}': missing message iterator class".format( |
| 534 | cls.__name__ |
| 535 | ) |
| 536 | ) |
| 537 | |
| 538 | if not issubclass(iter_cls, bt2.message_iterator._UserMessageIterator): |
| 539 | raise bt2.IncompleteUserClass( |
| 540 | "cannot create component class '{}': message iterator class does not inherit bt2._UserMessageIterator".format( |
| 541 | cls.__name__ |
| 542 | ) |
| 543 | ) |
| 544 | |
| 545 | if not hasattr(iter_cls, '__next__'): |
| 546 | raise bt2.IncompleteUserClass( |
| 547 | "cannot create component class '{}': message iterator class is missing a __next__() method".format( |
| 548 | cls.__name__ |
| 549 | ) |
| 550 | ) |
| 551 | |
| 552 | cls._iter_cls = iter_cls |
| 553 | |
| 554 | @property |
| 555 | def name(cls): |
| 556 | ptr = cls._bt_as_component_class_ptr(cls._bt_cc_ptr) |
| 557 | return native_bt.component_class_get_name(ptr) |
| 558 | |
| 559 | @property |
| 560 | def description(cls): |
| 561 | ptr = cls._bt_as_component_class_ptr(cls._bt_cc_ptr) |
| 562 | return native_bt.component_class_get_description(ptr) |
| 563 | |
| 564 | @property |
| 565 | def help(cls): |
| 566 | ptr = cls._bt_as_component_class_ptr(cls._bt_cc_ptr) |
| 567 | return native_bt.component_class_get_help(ptr) |
| 568 | |
| 569 | @property |
| 570 | def addr(cls): |
| 571 | return int(cls._bt_cc_ptr) |
| 572 | |
| 573 | def _bt_query_from_native(cls, query_exec_ptr, obj, params_ptr, log_level): |
| 574 | # this can raise, in which case the native call to |
| 575 | # bt_component_class_query() returns NULL |
| 576 | if params_ptr is not None: |
| 577 | params = bt2.value._create_from_ptr_and_get_ref(params_ptr) |
| 578 | else: |
| 579 | params = None |
| 580 | |
| 581 | query_exec = bt2.QueryExecutor._create_from_ptr_and_get_ref(query_exec_ptr) |
| 582 | |
| 583 | # this can raise, but the native side checks the exception |
| 584 | results = cls._query(query_exec, obj, params, log_level) |
| 585 | |
| 586 | # this can raise, but the native side checks the exception |
| 587 | results = bt2.create_value(results) |
| 588 | |
| 589 | if results is None: |
| 590 | results_ptr = native_bt.value_null |
| 591 | else: |
| 592 | # return new reference |
| 593 | results_ptr = results._ptr |
| 594 | |
| 595 | # We return a new reference. |
| 596 | bt2.value._Value._get_ref(results_ptr) |
| 597 | |
| 598 | return int(results_ptr) |
| 599 | |
| 600 | def _query(cls, query_executor, obj, params, log_level): |
| 601 | raise NotImplementedError |
| 602 | |
| 603 | def _bt_component_class_ptr(self): |
| 604 | return self._bt_as_component_class_ptr(self._bt_cc_ptr) |
| 605 | |
| 606 | def __del__(cls): |
| 607 | if hasattr(cls, '_bt_cc_ptr'): |
| 608 | cc_ptr = cls._bt_as_component_class_ptr(cls._bt_cc_ptr) |
| 609 | native_bt.component_class_put_ref(cc_ptr) |
| 610 | |
| 611 | |
| 612 | # Subclasses must provide these methods or property: |
| 613 | # |
| 614 | # - _bt_as_not_self_specific_component_ptr: static method, must return the passed |
| 615 | # specialized self component pointer (e.g. 'bt_self_component_sink *') as a |
| 616 | # specialized non-self pointer (e.g. 'bt_component_sink *'). |
| 617 | # - _bt_borrow_component_class_ptr: static method, must return a pointer to the |
| 618 | # specialized component class (e.g. 'bt_component_class_sink *') of the |
| 619 | # passed specialized component pointer (e.g. 'bt_component_sink *'). |
| 620 | # - _bt_comp_cls_type: property, one of the native_bt.COMPONENT_CLASS_TYPE_* |
| 621 | # constants. |
| 622 | |
| 623 | |
| 624 | class _UserComponent(metaclass=_UserComponentType): |
| 625 | @property |
| 626 | def name(self): |
| 627 | ptr = self._bt_as_not_self_specific_component_ptr(self._bt_ptr) |
| 628 | ptr = self._bt_as_component_ptr(ptr) |
| 629 | name = native_bt.component_get_name(ptr) |
| 630 | assert name is not None |
| 631 | return name |
| 632 | |
| 633 | @property |
| 634 | def logging_level(self): |
| 635 | ptr = self._bt_as_not_self_specific_component_ptr(self._bt_ptr) |
| 636 | ptr = self._bt_as_component_ptr(ptr) |
| 637 | return native_bt.component_get_logging_level(ptr) |
| 638 | |
| 639 | @property |
| 640 | def cls(self): |
| 641 | comp_ptr = self._bt_as_not_self_specific_component_ptr(self._bt_ptr) |
| 642 | cc_ptr = self._bt_borrow_component_class_ptr(comp_ptr) |
| 643 | return _create_component_class_from_ptr_and_get_ref( |
| 644 | cc_ptr, self._bt_comp_cls_type |
| 645 | ) |
| 646 | |
| 647 | @property |
| 648 | def addr(self): |
| 649 | return int(self._bt_ptr) |
| 650 | |
| 651 | def __init__(self, params=None): |
| 652 | pass |
| 653 | |
| 654 | def _finalize(self): |
| 655 | pass |
| 656 | |
| 657 | def _port_connected(self, port, other_port): |
| 658 | pass |
| 659 | |
| 660 | def _bt_port_connected_from_native( |
| 661 | self, self_port_ptr, self_port_type, other_port_ptr |
| 662 | ): |
| 663 | port = bt2.port._create_self_from_ptr_and_get_ref(self_port_ptr, self_port_type) |
| 664 | |
| 665 | if self_port_type == native_bt.PORT_TYPE_OUTPUT: |
| 666 | other_port_type = native_bt.PORT_TYPE_INPUT |
| 667 | else: |
| 668 | other_port_type = native_bt.PORT_TYPE_OUTPUT |
| 669 | |
| 670 | other_port = bt2.port._create_from_ptr_and_get_ref( |
| 671 | other_port_ptr, other_port_type |
| 672 | ) |
| 673 | self._port_connected(port, other_port) |
| 674 | |
| 675 | def _create_trace_class(self, assigns_automatic_stream_class_id=True): |
| 676 | ptr = self._bt_as_self_component_ptr(self._bt_ptr) |
| 677 | tc_ptr = native_bt.trace_class_create(ptr) |
| 678 | |
| 679 | if tc_ptr is None: |
| 680 | raise bt2._MemoryError('could not create trace class') |
| 681 | |
| 682 | tc = bt2._TraceClass._create_from_ptr(tc_ptr) |
| 683 | tc._assigns_automatic_stream_class_id = assigns_automatic_stream_class_id |
| 684 | |
| 685 | return tc |
| 686 | |
| 687 | def _create_clock_class( |
| 688 | self, |
| 689 | frequency=None, |
| 690 | name=None, |
| 691 | description=None, |
| 692 | precision=None, |
| 693 | offset=None, |
| 694 | origin_is_unix_epoch=True, |
| 695 | uuid=None, |
| 696 | ): |
| 697 | ptr = self._bt_as_self_component_ptr(self._bt_ptr) |
| 698 | cc_ptr = native_bt.clock_class_create(ptr) |
| 699 | |
| 700 | if cc_ptr is None: |
| 701 | raise bt2._MemoryError('could not create clock class') |
| 702 | |
| 703 | cc = bt2.clock_class._ClockClass._create_from_ptr(cc_ptr) |
| 704 | |
| 705 | if frequency is not None: |
| 706 | cc._frequency = frequency |
| 707 | |
| 708 | if name is not None: |
| 709 | cc._name = name |
| 710 | |
| 711 | if description is not None: |
| 712 | cc._description = description |
| 713 | |
| 714 | if precision is not None: |
| 715 | cc._precision = precision |
| 716 | |
| 717 | if offset is not None: |
| 718 | cc._offset = offset |
| 719 | |
| 720 | cc._origin_is_unix_epoch = origin_is_unix_epoch |
| 721 | |
| 722 | if uuid is not None: |
| 723 | cc._uuid = uuid |
| 724 | |
| 725 | return cc |
| 726 | |
| 727 | |
| 728 | class _UserSourceComponent(_UserComponent, _SourceComponent): |
| 729 | _bt_as_not_self_specific_component_ptr = staticmethod( |
| 730 | native_bt.self_component_source_as_component_source |
| 731 | ) |
| 732 | _bt_as_self_component_ptr = staticmethod( |
| 733 | native_bt.self_component_source_as_self_component |
| 734 | ) |
| 735 | |
| 736 | @property |
| 737 | def _output_ports(self): |
| 738 | def get_output_port_count(self_ptr): |
| 739 | ptr = self._bt_as_not_self_specific_component_ptr(self_ptr) |
| 740 | return native_bt.component_source_get_output_port_count(ptr) |
| 741 | |
| 742 | return _ComponentPorts( |
| 743 | self._bt_ptr, |
| 744 | native_bt.self_component_source_borrow_output_port_by_name, |
| 745 | native_bt.self_component_source_borrow_output_port_by_index, |
| 746 | get_output_port_count, |
| 747 | bt2.port._UserComponentOutputPort, |
| 748 | ) |
| 749 | |
| 750 | def _add_output_port(self, name, user_data=None): |
| 751 | utils._check_str(name) |
| 752 | fn = native_bt.self_component_source_add_output_port |
| 753 | comp_status, self_port_ptr = fn(self._bt_ptr, name, user_data) |
| 754 | utils._handle_func_status( |
| 755 | comp_status, 'cannot add output port to source component object' |
| 756 | ) |
| 757 | assert self_port_ptr is not None |
| 758 | return bt2.port._UserComponentOutputPort._create_from_ptr(self_port_ptr) |
| 759 | |
| 760 | |
| 761 | class _UserFilterComponent(_UserComponent, _FilterComponent): |
| 762 | _bt_as_not_self_specific_component_ptr = staticmethod( |
| 763 | native_bt.self_component_filter_as_component_filter |
| 764 | ) |
| 765 | _bt_as_self_component_ptr = staticmethod( |
| 766 | native_bt.self_component_filter_as_self_component |
| 767 | ) |
| 768 | |
| 769 | @property |
| 770 | def _output_ports(self): |
| 771 | def get_output_port_count(self_ptr): |
| 772 | ptr = self._bt_as_not_self_specific_component_ptr(self_ptr) |
| 773 | return native_bt.component_filter_get_output_port_count(ptr) |
| 774 | |
| 775 | return _ComponentPorts( |
| 776 | self._bt_ptr, |
| 777 | native_bt.self_component_filter_borrow_output_port_by_name, |
| 778 | native_bt.self_component_filter_borrow_output_port_by_index, |
| 779 | get_output_port_count, |
| 780 | bt2.port._UserComponentOutputPort, |
| 781 | ) |
| 782 | |
| 783 | @property |
| 784 | def _input_ports(self): |
| 785 | def get_input_port_count(self_ptr): |
| 786 | ptr = self._bt_as_not_self_specific_component_ptr(self_ptr) |
| 787 | return native_bt.component_filter_get_input_port_count(ptr) |
| 788 | |
| 789 | return _ComponentPorts( |
| 790 | self._bt_ptr, |
| 791 | native_bt.self_component_filter_borrow_input_port_by_name, |
| 792 | native_bt.self_component_filter_borrow_input_port_by_index, |
| 793 | get_input_port_count, |
| 794 | bt2.port._UserComponentInputPort, |
| 795 | ) |
| 796 | |
| 797 | def _add_output_port(self, name, user_data=None): |
| 798 | utils._check_str(name) |
| 799 | fn = native_bt.self_component_filter_add_output_port |
| 800 | comp_status, self_port_ptr = fn(self._bt_ptr, name, user_data) |
| 801 | utils._handle_func_status( |
| 802 | comp_status, 'cannot add output port to filter component object' |
| 803 | ) |
| 804 | assert self_port_ptr |
| 805 | return bt2.port._UserComponentOutputPort._create_from_ptr(self_port_ptr) |
| 806 | |
| 807 | def _add_input_port(self, name, user_data=None): |
| 808 | utils._check_str(name) |
| 809 | fn = native_bt.self_component_filter_add_input_port |
| 810 | comp_status, self_port_ptr = fn(self._bt_ptr, name, user_data) |
| 811 | utils._handle_func_status( |
| 812 | comp_status, 'cannot add input port to filter component object' |
| 813 | ) |
| 814 | assert self_port_ptr |
| 815 | return bt2.port._UserComponentInputPort._create_from_ptr(self_port_ptr) |
| 816 | |
| 817 | |
| 818 | class _UserSinkComponent(_UserComponent, _SinkComponent): |
| 819 | _bt_as_not_self_specific_component_ptr = staticmethod( |
| 820 | native_bt.self_component_sink_as_component_sink |
| 821 | ) |
| 822 | _bt_as_self_component_ptr = staticmethod( |
| 823 | native_bt.self_component_sink_as_self_component |
| 824 | ) |
| 825 | |
| 826 | def _bt_graph_is_configured_from_native(self): |
| 827 | self._graph_is_configured() |
| 828 | |
| 829 | def _graph_is_configured(self): |
| 830 | pass |
| 831 | |
| 832 | @property |
| 833 | def _input_ports(self): |
| 834 | def get_input_port_count(self_ptr): |
| 835 | ptr = self._bt_as_not_self_specific_component_ptr(self_ptr) |
| 836 | return native_bt.component_sink_get_input_port_count(ptr) |
| 837 | |
| 838 | return _ComponentPorts( |
| 839 | self._bt_ptr, |
| 840 | native_bt.self_component_sink_borrow_input_port_by_name, |
| 841 | native_bt.self_component_sink_borrow_input_port_by_index, |
| 842 | get_input_port_count, |
| 843 | bt2.port._UserComponentInputPort, |
| 844 | ) |
| 845 | |
| 846 | def _add_input_port(self, name, user_data=None): |
| 847 | utils._check_str(name) |
| 848 | fn = native_bt.self_component_sink_add_input_port |
| 849 | comp_status, self_port_ptr = fn(self._bt_ptr, name, user_data) |
| 850 | utils._handle_func_status( |
| 851 | comp_status, 'cannot add input port to sink component object' |
| 852 | ) |
| 853 | assert self_port_ptr |
| 854 | return bt2.port._UserComponentInputPort._create_from_ptr(self_port_ptr) |
| 855 | |
| 856 | def _create_input_port_message_iterator(self, input_port): |
| 857 | utils._check_type(input_port, bt2.port._UserComponentInputPort) |
| 858 | |
| 859 | msg_iter_ptr = native_bt.self_component_port_input_message_iterator_create_from_sink_component( |
| 860 | self._bt_ptr, input_port._ptr |
| 861 | ) |
| 862 | |
| 863 | if msg_iter_ptr is None: |
| 864 | raise bt2.CreationError('cannot create message iterator object') |
| 865 | |
| 866 | return bt2.message_iterator._UserComponentInputPortMessageIterator(msg_iter_ptr) |