src/bindings/python/bt2/bt2/trace_collection_message_iterator.py

   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 utils, native_bt
  24 import bt2
  25 import itertools
  26 from bt2 import message_iterator as bt2_message_iterator
  27 from bt2 import port as bt2_port
  28 from bt2 import component as bt2_component
  29 from bt2 import value as bt2_value
  30 from bt2 import plugin as bt2_plugin
  31 import datetime
  32 from collections import namedtuple
  33 import numbers
  34
  35
  36 # a pair of component and ComponentSpec
  37 _ComponentAndSpec = namedtuple('_ComponentAndSpec', ['comp', 'spec'])
  38
  39
  40 class _BaseComponentSpec:
  41     # Base for any component spec that can be passed to
  42     # TraceCollectionMessageIterator.
  43     def __init__(self, params, obj, logging_level):
  44         if logging_level is not None:
  45             utils._check_log_level(logging_level)
  46
  47         self._params = bt2.create_value(params)
  48         self._obj = obj
  49         self._logging_level = logging_level
  50
  51     @property
  52     def params(self):
  53         return self._params
  54
  55     @property
  56     def obj(self):
  57         return self._obj
  58
  59     @property
  60     def logging_level(self):
  61         return self._logging_level
  62
  63
  64 class ComponentSpec(_BaseComponentSpec):
  65     # A component spec with a specific component class.
  66     def __init__(
  67         self,
  68         component_class,
  69         params=None,
  70         obj=None,
  71         logging_level=bt2.LoggingLevel.NONE,
  72     ):
  73         if type(params) is str:
  74             params = {'inputs': [params]}
  75
  76         super().__init__(params, obj, logging_level)
  77
  78         is_cc_object = isinstance(
  79             component_class, (bt2._SourceComponentClass, bt2._FilterComponentClass)
  80         )
  81         is_user_cc_type = isinstance(
  82             component_class, bt2_component._UserComponentType
  83         ) and issubclass(
  84             component_class, (bt2._UserSourceComponent, bt2._UserFilterComponent)
  85         )
  86
  87         if not is_cc_object and not is_user_cc_type:
  88             raise TypeError(
  89                 "'{}' is not a source or filter component class".format(
  90                     component_class.__class__.__name__
  91                 )
  92             )
  93
  94         self._component_class = component_class
  95
  96     @property
  97     def component_class(self):
  98         return self._component_class
  99
 100     @classmethod
 101     def from_named_plugin_and_component_class(
 102         cls,
 103         plugin_name,
 104         component_class_name,
 105         params=None,
 106         obj=None,
 107         logging_level=bt2.LoggingLevel.NONE,
 108     ):
 109         plugin = bt2.find_plugin(plugin_name)
 110
 111         if plugin is None:
 112             raise ValueError('no such plugin: {}'.format(plugin_name))
 113
 114         if component_class_name in plugin.source_component_classes:
 115             comp_class = plugin.source_component_classes[component_class_name]
 116         elif component_class_name in plugin.filter_component_classes:
 117             comp_class = plugin.filter_component_classes[component_class_name]
 118         else:
 119             raise KeyError(
 120                 'source or filter component class `{}` not found in plugin `{}`'.format(
 121                     component_class_name, plugin_name
 122                 )
 123             )
 124
 125         return cls(comp_class, params, obj, logging_level)
 126
 127
 128 class AutoSourceComponentSpec(_BaseComponentSpec):
 129     # A component spec that does automatic source discovery.
 130     _no_obj = object()
 131
 132     def __init__(self, input, params=None, obj=_no_obj, logging_level=None):
 133         super().__init__(params, obj, logging_level)
 134         self._input = input
 135
 136     @property
 137     def input(self):
 138         return self._input
 139
 140
 141 def _auto_discover_source_component_specs(auto_source_comp_specs, plugin_set):
 142     # Transform a list of `AutoSourceComponentSpec` in a list of `ComponentSpec`
 143     # using the automatic source discovery mechanism.
 144     inputs = bt2.ArrayValue([spec.input for spec in auto_source_comp_specs])
 145
 146     if plugin_set is None:
 147         plugin_set = bt2.find_plugins()
 148     else:
 149         utils._check_type(plugin_set, bt2_plugin._PluginSet)
 150
 151     res_ptr = native_bt.bt2_auto_discover_source_components(
 152         inputs._ptr, plugin_set._ptr
 153     )
 154
 155     if res_ptr is None:
 156         raise bt2._MemoryError('cannot auto discover source components')
 157
 158     res = bt2_value._create_from_ptr(res_ptr)
 159
 160     assert type(res) == bt2.MapValue
 161     assert 'status' in res
 162
 163     status = res['status']
 164     utils._handle_func_status(status, 'cannot auto-discover source components')
 165
 166     comp_specs = []
 167     comp_specs_raw = res['results']
 168     assert type(comp_specs_raw) == bt2.ArrayValue
 169
 170     used_input_indices = set()
 171
 172     for comp_spec_raw in comp_specs_raw:
 173         assert type(comp_spec_raw) == bt2.ArrayValue
 174         assert len(comp_spec_raw) == 4
 175
 176         plugin_name = comp_spec_raw[0]
 177         assert type(plugin_name) == bt2.StringValue
 178         plugin_name = str(plugin_name)
 179
 180         class_name = comp_spec_raw[1]
 181         assert type(class_name) == bt2.StringValue
 182         class_name = str(class_name)
 183
 184         comp_inputs = comp_spec_raw[2]
 185         assert type(comp_inputs) == bt2.ArrayValue
 186
 187         comp_orig_indices = comp_spec_raw[3]
 188         assert type(comp_orig_indices)
 189
 190         params = bt2.MapValue()
 191         logging_level = bt2.LoggingLevel.NONE
 192         obj = None
 193
 194         # Compute `params` for this component by piling up params given to all
 195         # AutoSourceComponentSpec objects that contributed in the instantiation
 196         # of this component.
 197         #
 198         # The effective log level for a component is the last one specified
 199         # across the AutoSourceComponentSpec that contributed in its
 200         # instantiation.
 201         for idx in comp_orig_indices:
 202             orig_spec = auto_source_comp_specs[idx]
 203
 204             if orig_spec.params is not None:
 205                 params.update(orig_spec.params)
 206
 207             if orig_spec.logging_level is not None:
 208                 logging_level = orig_spec.logging_level
 209
 210             if orig_spec.obj is not AutoSourceComponentSpec._no_obj:
 211                 obj = orig_spec.obj
 212
 213             used_input_indices.add(int(idx))
 214
 215         params['inputs'] = comp_inputs
 216
 217         comp_specs.append(
 218             ComponentSpec.from_named_plugin_and_component_class(
 219                 plugin_name,
 220                 class_name,
 221                 params=params,
 222                 obj=obj,
 223                 logging_level=logging_level,
 224             )
 225         )
 226
 227     if len(used_input_indices) != len(inputs):
 228         unused_input_indices = set(range(len(inputs))) - used_input_indices
 229         unused_input_indices = sorted(unused_input_indices)
 230         unused_inputs = [str(inputs[x]) for x in unused_input_indices]
 231
 232         msg = (
 233             'Some auto source component specs did not produce any component: '
 234             + ', '.join(unused_inputs)
 235         )
 236         raise RuntimeError(msg)
 237
 238     return comp_specs
 239
 240
 241 # datetime.datetime or integral to nanoseconds
 242 def _get_ns(obj):
 243     if obj is None:
 244         return
 245
 246     if isinstance(obj, numbers.Real):
 247         # consider that it's already in seconds
 248         s = obj
 249     elif isinstance(obj, datetime.datetime):
 250         # s -> ns
 251         s = obj.timestamp()
 252     else:
 253         raise TypeError(
 254             '"{}" is not an integral number or a datetime.datetime object'.format(obj)
 255         )
 256
 257     return int(s * 1e9)
 258
 259
 260 class _TraceCollectionMessageIteratorProxySink(bt2_component._UserSinkComponent):
 261     def __init__(self, params, msg_list):
 262         assert type(msg_list) is list
 263         self._msg_list = msg_list
 264         self._add_input_port('in')
 265
 266     def _user_graph_is_configured(self):
 267         self._msg_iter = self._create_input_port_message_iterator(
 268             self._input_ports['in']
 269         )
 270
 271     def _user_consume(self):
 272         assert self._msg_list[0] is None
 273         self._msg_list[0] = next(self._msg_iter)
 274
 275
 276 class TraceCollectionMessageIterator(bt2_message_iterator._MessageIterator):
 277     def __init__(
 278         self,
 279         source_component_specs,
 280         filter_component_specs=None,
 281         stream_intersection_mode=False,
 282         begin=None,
 283         end=None,
 284         plugin_set=None,
 285     ):
 286         utils._check_bool(stream_intersection_mode)
 287         self._stream_intersection_mode = stream_intersection_mode
 288         self._begin_ns = _get_ns(begin)
 289         self._end_ns = _get_ns(end)
 290         self._msg_list = [None]
 291
 292         # If a single item is provided, convert to a list.
 293         if type(source_component_specs) in (
 294             ComponentSpec,
 295             AutoSourceComponentSpec,
 296             str,
 297         ):
 298             source_component_specs = [source_component_specs]
 299
 300         # Convert any string to an AutoSourceComponentSpec.
 301         def str_to_auto(item):
 302             if type(item) is str:
 303                 item = AutoSourceComponentSpec(item)
 304
 305             return item
 306
 307         source_component_specs = [str_to_auto(s) for s in source_component_specs]
 308
 309         if type(filter_component_specs) is ComponentSpec:
 310             filter_component_specs = [filter_component_specs]
 311         elif filter_component_specs is None:
 312             filter_component_specs = []
 313
 314         self._validate_source_component_specs(source_component_specs)
 315         self._validate_filter_component_specs(filter_component_specs)
 316
 317         # Pass any `ComponentSpec` instance as-is.
 318         self._src_comp_specs = [
 319             spec for spec in source_component_specs if type(spec) is ComponentSpec
 320         ]
 321
 322         # Convert any `AutoSourceComponentSpec` in concrete `ComponentSpec` instances.
 323         auto_src_comp_specs = [
 324             spec
 325             for spec in source_component_specs
 326             if type(spec) is AutoSourceComponentSpec
 327         ]
 328         self._src_comp_specs += _auto_discover_source_component_specs(
 329             auto_src_comp_specs, plugin_set
 330         )
 331
 332         self._flt_comp_specs = filter_component_specs
 333         self._next_suffix = 1
 334         self._connect_ports = False
 335
 336         # lists of _ComponentAndSpec
 337         self._src_comps_and_specs = []
 338         self._flt_comps_and_specs = []
 339
 340         self._build_graph()
 341
 342     def _validate_source_component_specs(self, comp_specs):
 343         for comp_spec in comp_specs:
 344             if (
 345                 type(comp_spec) is not ComponentSpec
 346                 and type(comp_spec) is not AutoSourceComponentSpec
 347             ):
 348                 raise TypeError(
 349                     '"{}" object is not a ComponentSpec or AutoSourceComponentSpec'.format(
 350                         type(comp_spec)
 351                     )
 352                 )
 353
 354     def _validate_filter_component_specs(self, comp_specs):
 355         for comp_spec in comp_specs:
 356             if type(comp_spec) is not ComponentSpec:
 357                 raise TypeError(
 358                     '"{}" object is not a ComponentSpec'.format(type(comp_spec))
 359                 )
 360
 361     def __next__(self):
 362         assert self._msg_list[0] is None
 363         self._graph.run_once()
 364         msg = self._msg_list[0]
 365         assert msg is not None
 366         self._msg_list[0] = None
 367         return msg
 368
 369     def _create_stream_intersection_trimmer(self, component, port):
 370         # find the original parameters specified by the user to create
 371         # this port's component to get the `inputs` parameter
 372         for src_comp_and_spec in self._src_comps_and_specs:
 373             if component == src_comp_and_spec.comp:
 374                 break
 375
 376         try:
 377             inputs = src_comp_and_spec.spec.params['inputs']
 378         except Exception as e:
 379             raise ValueError(
 380                 'all source components must be created with an "inputs" parameter in stream intersection mode'
 381             ) from e
 382
 383         params = {'inputs': inputs}
 384
 385         # query the port's component for the `babeltrace.trace-info`
 386         # object which contains the stream intersection range for each
 387         # exposed trace
 388         query_exec = bt2.QueryExecutor(
 389             src_comp_and_spec.comp.cls, 'babeltrace.trace-info', params
 390         )
 391         trace_info_res = query_exec.query()
 392         begin = None
 393         end = None
 394
 395         # find the trace info for this port's trace
 396         try:
 397             for trace_info in trace_info_res:
 398                 for stream in trace_info['streams']:
 399                     if stream['port-name'] == port.name:
 400                         range_ns = trace_info['intersection-range-ns']
 401                         begin = range_ns['begin']
 402                         end = range_ns['end']
 403                         break
 404         except Exception:
 405             pass
 406
 407         if begin is None or end is None:
 408             raise RuntimeError(
 409                 'cannot find stream intersection range for port "{}"'.format(port.name)
 410             )
 411
 412         name = 'trimmer-{}-{}'.format(src_comp_and_spec.comp.name, port.name)
 413         return self._create_trimmer(begin, end, name)
 414
 415     def _create_muxer(self):
 416         plugin = bt2.find_plugin('utils')
 417
 418         if plugin is None:
 419             raise RuntimeError('cannot find "utils" plugin (needed for the muxer)')
 420
 421         if 'muxer' not in plugin.filter_component_classes:
 422             raise RuntimeError(
 423                 'cannot find "muxer" filter component class in "utils" plugin'
 424             )
 425
 426         comp_cls = plugin.filter_component_classes['muxer']
 427         return self._graph.add_component(comp_cls, 'muxer')
 428
 429     def _create_trimmer(self, begin_ns, end_ns, name):
 430         plugin = bt2.find_plugin('utils')
 431
 432         if plugin is None:
 433             raise RuntimeError('cannot find "utils" plugin (needed for the trimmer)')
 434
 435         if 'trimmer' not in plugin.filter_component_classes:
 436             raise RuntimeError(
 437                 'cannot find "trimmer" filter component class in "utils" plugin'
 438             )
 439
 440         params = {}
 441
 442         def ns_to_string(ns):
 443             s_part = ns // 1000000000
 444             ns_part = ns % 1000000000
 445             return '{}.{:09d}'.format(s_part, ns_part)
 446
 447         if begin_ns is not None:
 448             params['begin'] = ns_to_string(begin_ns)
 449
 450         if end_ns is not None:
 451             params['end'] = ns_to_string(end_ns)
 452
 453         comp_cls = plugin.filter_component_classes['trimmer']
 454         return self._graph.add_component(comp_cls, name, params)
 455
 456     def _get_unique_comp_name(self, comp_cls):
 457         name = comp_cls.name
 458         comps_and_specs = itertools.chain(
 459             self._src_comps_and_specs, self._flt_comps_and_specs
 460         )
 461
 462         if name in [comp_and_spec.comp.name for comp_and_spec in comps_and_specs]:
 463             name += '-{}'.format(self._next_suffix)
 464             self._next_suffix += 1
 465
 466         return name
 467
 468     def _create_comp(self, comp_spec):
 469         comp_cls = comp_spec.component_class
 470         name = self._get_unique_comp_name(comp_cls)
 471         comp = self._graph.add_component(
 472             comp_cls, name, comp_spec.params, comp_spec.obj, comp_spec.logging_level
 473         )
 474         return comp
 475
 476     def _get_free_muxer_input_port(self):
 477         for port in self._muxer_comp.input_ports.values():
 478             if not port.is_connected:
 479                 return port
 480
 481     def _connect_src_comp_port(self, component, port):
 482         # if this trace collection iterator is in stream intersection
 483         # mode, we need this connection:
 484         #
 485         #     port -> trimmer -> muxer
 486         #
 487         # otherwise, simply:
 488         #
 489         #     port -> muxer
 490         if self._stream_intersection_mode:
 491             trimmer_comp = self._create_stream_intersection_trimmer(component, port)
 492             self._graph.connect_ports(port, trimmer_comp.input_ports['in'])
 493             port_to_muxer = trimmer_comp.output_ports['out']
 494         else:
 495             port_to_muxer = port
 496
 497         self._graph.connect_ports(port_to_muxer, self._get_free_muxer_input_port())
 498
 499     def _graph_port_added(self, component, port):
 500         if not self._connect_ports:
 501             return
 502
 503         if type(port) is bt2_port._InputPort:
 504             return
 505
 506         if component not in [comp.comp for comp in self._src_comps_and_specs]:
 507             # do not care about non-source components (muxer, trimmer, etc.)
 508             return
 509
 510         self._connect_src_comp_port(component, port)
 511
 512     def _get_greatest_operative_mip_version(self):
 513         def append_comp_specs_descriptors(descriptors, comp_specs):
 514             for comp_spec in comp_specs:
 515                 descriptors.append(
 516                     bt2.ComponentDescriptor(
 517                         comp_spec.component_class, comp_spec.params, comp_spec.obj
 518                     )
 519                 )
 520
 521         descriptors = []
 522         append_comp_specs_descriptors(descriptors, self._src_comp_specs)
 523         append_comp_specs_descriptors(descriptors, self._flt_comp_specs)
 524
 525         if self._stream_intersection_mode:
 526             # we also need at least one `flt.utils.trimmer` component
 527             comp_spec = ComponentSpec.from_named_plugin_and_component_class(
 528                 'utils', 'trimmer'
 529             )
 530             append_comp_specs_descriptors(descriptors, [comp_spec])
 531
 532         mip_version = bt2.get_greatest_operative_mip_version(descriptors)
 533
 534         if mip_version is None:
 535             msg = 'failed to find an operative message interchange protocol version (components are not interoperable)'
 536             raise RuntimeError(msg)
 537
 538         return mip_version
 539
 540     def _build_graph(self):
 541         self._graph = bt2.Graph(self._get_greatest_operative_mip_version())
 542         self._graph.add_port_added_listener(self._graph_port_added)
 543         self._muxer_comp = self._create_muxer()
 544
 545         if self._begin_ns is not None or self._end_ns is not None:
 546             trimmer_comp = self._create_trimmer(self._begin_ns, self._end_ns, 'trimmer')
 547             self._graph.connect_ports(
 548                 self._muxer_comp.output_ports['out'], trimmer_comp.input_ports['in']
 549             )
 550             last_flt_out_port = trimmer_comp.output_ports['out']
 551         else:
 552             last_flt_out_port = self._muxer_comp.output_ports['out']
 553
 554         # create extra filter components (chained)
 555         for comp_spec in self._flt_comp_specs:
 556             comp = self._create_comp(comp_spec)
 557             self._flt_comps_and_specs.append(_ComponentAndSpec(comp, comp_spec))
 558
 559         # connect the extra filter chain
 560         for comp_and_spec in self._flt_comps_and_specs:
 561             in_port = list(comp_and_spec.comp.input_ports.values())[0]
 562             out_port = list(comp_and_spec.comp.output_ports.values())[0]
 563             self._graph.connect_ports(last_flt_out_port, in_port)
 564             last_flt_out_port = out_port
 565
 566         # Here we create the components, self._graph_port_added() is
 567         # called when they add ports, but the callback returns early
 568         # because self._connect_ports is False. This is because the
 569         # self._graph_port_added() could not find the associated source
 570         # component specification in self._src_comps_and_specs because
 571         # it does not exist yet (it needs the created component to
 572         # exist).
 573         for comp_spec in self._src_comp_specs:
 574             comp = self._create_comp(comp_spec)
 575             self._src_comps_and_specs.append(_ComponentAndSpec(comp, comp_spec))
 576
 577         # Now we connect the ports which exist at this point. We allow
 578         # self._graph_port_added() to automatically connect _new_ ports.
 579         self._connect_ports = True
 580
 581         for comp_and_spec in self._src_comps_and_specs:
 582             # Keep a separate list because comp_and_spec.output_ports
 583             # could change during the connection of one of its ports.
 584             # Any new port is handled by self._graph_port_added().
 585             out_ports = [port for port in comp_and_spec.comp.output_ports.values()]
 586
 587             for out_port in out_ports:
 588                 if out_port.is_connected:
 589                     continue
 590
 591                 self._connect_src_comp_port(comp_and_spec.comp, out_port)
 592
 593         # Add the proxy sink, passing our message list to share consumed
 594         # messages with this trace collection message iterator.
 595         sink = self._graph.add_component(
 596             _TraceCollectionMessageIteratorProxySink, 'proxy-sink', obj=self._msg_list
 597         )
 598         sink_in_port = sink.input_ports['in']
 599
 600         # connect last filter to proxy sink
 601         self._graph.connect_ports(last_flt_out_port, sink_in_port)