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