Move to kernel style SPDX license identifiers
[babeltrace.git] / src / bindings / python / bt2 / bt2 / trace_collection_message_iterator.py
1 # SPDX-License-Identifier: MIT
2 #
3 # Copyright (c) 2017 Philippe Proulx <pproulx@efficios.com>
4
5 from bt2 import utils, native_bt
6 import bt2
7 import itertools
8 from bt2 import message_iterator as bt2_message_iterator
9 from bt2 import port as bt2_port
10 from bt2 import component as bt2_component
11 from bt2 import value as bt2_value
12 from bt2 import plugin as bt2_plugin
13 import datetime
14 from collections import namedtuple
15 import numbers
16
17
18 # a pair of component and ComponentSpec
19 _ComponentAndSpec = namedtuple('_ComponentAndSpec', ['comp', 'spec'])
20
21
22 class _BaseComponentSpec:
23 # Base for any component spec that can be passed to
24 # TraceCollectionMessageIterator.
25 def __init__(self, params, obj, logging_level):
26 if logging_level is not None:
27 utils._check_log_level(logging_level)
28
29 self._params = bt2.create_value(params)
30 self._obj = obj
31 self._logging_level = logging_level
32
33 @property
34 def params(self):
35 return self._params
36
37 @property
38 def obj(self):
39 return self._obj
40
41 @property
42 def logging_level(self):
43 return self._logging_level
44
45
46 class ComponentSpec(_BaseComponentSpec):
47 # A component spec with a specific component class.
48 def __init__(
49 self,
50 component_class,
51 params=None,
52 obj=None,
53 logging_level=bt2.LoggingLevel.NONE,
54 ):
55 if type(params) is str:
56 params = {'inputs': [params]}
57
58 super().__init__(params, obj, logging_level)
59
60 is_cc_object = isinstance(
61 component_class,
62 (bt2._SourceComponentClassConst, bt2._FilterComponentClassConst),
63 )
64 is_user_cc_type = isinstance(
65 component_class, bt2_component._UserComponentType
66 ) and issubclass(
67 component_class, (bt2._UserSourceComponent, bt2._UserFilterComponent)
68 )
69
70 if not is_cc_object and not is_user_cc_type:
71 raise TypeError(
72 "'{}' is not a source or filter component class".format(
73 component_class.__class__.__name__
74 )
75 )
76
77 self._component_class = component_class
78
79 @property
80 def component_class(self):
81 return self._component_class
82
83 @classmethod
84 def from_named_plugin_and_component_class(
85 cls,
86 plugin_name,
87 component_class_name,
88 params=None,
89 obj=None,
90 logging_level=bt2.LoggingLevel.NONE,
91 ):
92 plugin = bt2.find_plugin(plugin_name)
93
94 if plugin is None:
95 raise ValueError('no such plugin: {}'.format(plugin_name))
96
97 if component_class_name in plugin.source_component_classes:
98 comp_class = plugin.source_component_classes[component_class_name]
99 elif component_class_name in plugin.filter_component_classes:
100 comp_class = plugin.filter_component_classes[component_class_name]
101 else:
102 raise KeyError(
103 'source or filter component class `{}` not found in plugin `{}`'.format(
104 component_class_name, plugin_name
105 )
106 )
107
108 return cls(comp_class, params, obj, logging_level)
109
110
111 class AutoSourceComponentSpec(_BaseComponentSpec):
112 # A component spec that does automatic source discovery.
113 _no_obj = object()
114
115 def __init__(self, input, params=None, obj=_no_obj, logging_level=None):
116 super().__init__(params, obj, logging_level)
117 self._input = input
118
119 @property
120 def input(self):
121 return self._input
122
123
124 def _auto_discover_source_component_specs(auto_source_comp_specs, plugin_set):
125 # Transform a list of `AutoSourceComponentSpec` in a list of `ComponentSpec`
126 # using the automatic source discovery mechanism.
127 inputs = bt2.ArrayValue([spec.input for spec in auto_source_comp_specs])
128
129 if plugin_set is None:
130 plugin_set = bt2.find_plugins()
131 else:
132 utils._check_type(plugin_set, bt2_plugin._PluginSet)
133
134 res_ptr = native_bt.bt2_auto_discover_source_components(
135 inputs._ptr, plugin_set._ptr
136 )
137
138 if res_ptr is None:
139 raise bt2._MemoryError('cannot auto discover source components')
140
141 res = bt2_value._create_from_ptr(res_ptr)
142
143 assert type(res) == bt2.MapValue
144 assert 'status' in res
145
146 status = res['status']
147 utils._handle_func_status(status, 'cannot auto-discover source components')
148
149 comp_specs = []
150 comp_specs_raw = res['results']
151 assert type(comp_specs_raw) == bt2.ArrayValue
152
153 used_input_indices = set()
154
155 for comp_spec_raw in comp_specs_raw:
156 assert type(comp_spec_raw) == bt2.ArrayValue
157 assert len(comp_spec_raw) == 4
158
159 plugin_name = comp_spec_raw[0]
160 assert type(plugin_name) == bt2.StringValue
161 plugin_name = str(plugin_name)
162
163 class_name = comp_spec_raw[1]
164 assert type(class_name) == bt2.StringValue
165 class_name = str(class_name)
166
167 comp_inputs = comp_spec_raw[2]
168 assert type(comp_inputs) == bt2.ArrayValue
169
170 comp_orig_indices = comp_spec_raw[3]
171 assert type(comp_orig_indices)
172
173 params = bt2.MapValue()
174 logging_level = bt2.LoggingLevel.NONE
175 obj = None
176
177 # Compute `params` for this component by piling up params given to all
178 # AutoSourceComponentSpec objects that contributed in the instantiation
179 # of this component.
180 #
181 # The effective log level for a component is the last one specified
182 # across the AutoSourceComponentSpec that contributed in its
183 # instantiation.
184 for idx in comp_orig_indices:
185 orig_spec = auto_source_comp_specs[idx]
186
187 if orig_spec.params is not None:
188 params.update(orig_spec.params)
189
190 if orig_spec.logging_level is not None:
191 logging_level = orig_spec.logging_level
192
193 if orig_spec.obj is not AutoSourceComponentSpec._no_obj:
194 obj = orig_spec.obj
195
196 used_input_indices.add(int(idx))
197
198 params['inputs'] = comp_inputs
199
200 comp_specs.append(
201 ComponentSpec.from_named_plugin_and_component_class(
202 plugin_name,
203 class_name,
204 params=params,
205 obj=obj,
206 logging_level=logging_level,
207 )
208 )
209
210 if len(used_input_indices) != len(inputs):
211 unused_input_indices = set(range(len(inputs))) - used_input_indices
212 unused_input_indices = sorted(unused_input_indices)
213 unused_inputs = [str(inputs[x]) for x in unused_input_indices]
214
215 msg = (
216 'Some auto source component specs did not produce any component: '
217 + ', '.join(unused_inputs)
218 )
219 raise RuntimeError(msg)
220
221 return comp_specs
222
223
224 # datetime.datetime or integral to nanoseconds
225 def _get_ns(obj):
226 if obj is None:
227 return
228
229 if isinstance(obj, numbers.Real):
230 # consider that it's already in seconds
231 s = obj
232 elif isinstance(obj, datetime.datetime):
233 # s -> ns
234 s = obj.timestamp()
235 else:
236 raise TypeError(
237 '"{}" is not an integral number or a datetime.datetime object'.format(obj)
238 )
239
240 return int(s * 1e9)
241
242
243 class _TraceCollectionMessageIteratorProxySink(bt2_component._UserSinkComponent):
244 def __init__(self, config, params, msg_list):
245 assert type(msg_list) is list
246 self._msg_list = msg_list
247 self._add_input_port('in')
248
249 def _user_graph_is_configured(self):
250 self._msg_iter = self._create_message_iterator(self._input_ports['in'])
251
252 def _user_consume(self):
253 assert self._msg_list[0] is None
254 self._msg_list[0] = next(self._msg_iter)
255
256
257 class TraceCollectionMessageIterator(bt2_message_iterator._MessageIterator):
258 def __init__(
259 self,
260 source_component_specs,
261 filter_component_specs=None,
262 stream_intersection_mode=False,
263 begin=None,
264 end=None,
265 plugin_set=None,
266 ):
267 utils._check_bool(stream_intersection_mode)
268 self._stream_intersection_mode = stream_intersection_mode
269 self._begin_ns = _get_ns(begin)
270 self._end_ns = _get_ns(end)
271 self._msg_list = [None]
272
273 # If a single item is provided, convert to a list.
274 if type(source_component_specs) in (
275 ComponentSpec,
276 AutoSourceComponentSpec,
277 str,
278 ):
279 source_component_specs = [source_component_specs]
280
281 # Convert any string to an AutoSourceComponentSpec.
282 def str_to_auto(item):
283 if type(item) is str:
284 item = AutoSourceComponentSpec(item)
285
286 return item
287
288 source_component_specs = [str_to_auto(s) for s in source_component_specs]
289
290 if type(filter_component_specs) is ComponentSpec:
291 filter_component_specs = [filter_component_specs]
292 elif filter_component_specs is None:
293 filter_component_specs = []
294
295 self._validate_source_component_specs(source_component_specs)
296 self._validate_filter_component_specs(filter_component_specs)
297
298 # Pass any `ComponentSpec` instance as-is.
299 self._src_comp_specs = [
300 spec for spec in source_component_specs if type(spec) is ComponentSpec
301 ]
302
303 # Convert any `AutoSourceComponentSpec` in concrete `ComponentSpec` instances.
304 auto_src_comp_specs = [
305 spec
306 for spec in source_component_specs
307 if type(spec) is AutoSourceComponentSpec
308 ]
309 self._src_comp_specs += _auto_discover_source_component_specs(
310 auto_src_comp_specs, plugin_set
311 )
312
313 self._flt_comp_specs = filter_component_specs
314 self._next_suffix = 1
315 self._connect_ports = False
316
317 # lists of _ComponentAndSpec
318 self._src_comps_and_specs = []
319 self._flt_comps_and_specs = []
320
321 self._build_graph()
322
323 def _compute_stream_intersections(self):
324 # Pre-compute the trimmer range to use for each port in the graph, when
325 # stream intersection mode is enabled.
326 self._stream_inter_port_to_range = {}
327
328 for src_comp_and_spec in self._src_comps_and_specs:
329 # Query the port's component for the `babeltrace.trace-infos`
330 # object which contains the range for each stream, from which we can
331 # compute the intersection of the streams in each trace.
332 query_exec = bt2.QueryExecutor(
333 src_comp_and_spec.spec.component_class,
334 'babeltrace.trace-infos',
335 src_comp_and_spec.spec.params,
336 )
337 trace_infos = query_exec.query()
338
339 for trace_info in trace_infos:
340 begin = max(
341 [
342 stream['range-ns']['begin']
343 for stream in trace_info['stream-infos']
344 ]
345 )
346 end = min(
347 [stream['range-ns']['end'] for stream in trace_info['stream-infos']]
348 )
349
350 # Each port associated to this trace will have this computed
351 # range.
352 for stream in trace_info['stream-infos']:
353 # A port name is unique within a component, but not
354 # necessarily across all components. Use a component
355 # and port name pair to make it unique across the graph.
356 port_name = str(stream['port-name'])
357 key = (src_comp_and_spec.comp.addr, port_name)
358 self._stream_inter_port_to_range[key] = (begin, end)
359
360 def _validate_source_component_specs(self, comp_specs):
361 for comp_spec in comp_specs:
362 if (
363 type(comp_spec) is not ComponentSpec
364 and type(comp_spec) is not AutoSourceComponentSpec
365 ):
366 raise TypeError(
367 '"{}" object is not a ComponentSpec or AutoSourceComponentSpec'.format(
368 type(comp_spec)
369 )
370 )
371
372 def _validate_filter_component_specs(self, comp_specs):
373 for comp_spec in comp_specs:
374 if type(comp_spec) is not ComponentSpec:
375 raise TypeError(
376 '"{}" object is not a ComponentSpec'.format(type(comp_spec))
377 )
378
379 def __next__(self):
380 assert self._msg_list[0] is None
381 self._graph.run_once()
382 msg = self._msg_list[0]
383 assert msg is not None
384 self._msg_list[0] = None
385 return msg
386
387 def _create_stream_intersection_trimmer(self, component, port):
388 key = (component.addr, port.name)
389 begin, end = self._stream_inter_port_to_range[key]
390 name = 'trimmer-{}-{}'.format(component.name, port.name)
391 return self._create_trimmer(begin, end, name)
392
393 def _create_muxer(self):
394 plugin = bt2.find_plugin('utils')
395
396 if plugin is None:
397 raise RuntimeError('cannot find "utils" plugin (needed for the muxer)')
398
399 if 'muxer' not in plugin.filter_component_classes:
400 raise RuntimeError(
401 'cannot find "muxer" filter component class in "utils" plugin'
402 )
403
404 comp_cls = plugin.filter_component_classes['muxer']
405 return self._graph.add_component(comp_cls, 'muxer')
406
407 def _create_trimmer(self, begin_ns, end_ns, name):
408 plugin = bt2.find_plugin('utils')
409
410 if plugin is None:
411 raise RuntimeError('cannot find "utils" plugin (needed for the trimmer)')
412
413 if 'trimmer' not in plugin.filter_component_classes:
414 raise RuntimeError(
415 'cannot find "trimmer" filter component class in "utils" plugin'
416 )
417
418 params = {}
419
420 def ns_to_string(ns):
421 s_part = ns // 1000000000
422 ns_part = ns % 1000000000
423 return '{}.{:09d}'.format(s_part, ns_part)
424
425 if begin_ns is not None:
426 params['begin'] = ns_to_string(begin_ns)
427
428 if end_ns is not None:
429 params['end'] = ns_to_string(end_ns)
430
431 comp_cls = plugin.filter_component_classes['trimmer']
432 return self._graph.add_component(comp_cls, name, params)
433
434 def _get_unique_comp_name(self, comp_cls):
435 name = comp_cls.name
436 comps_and_specs = itertools.chain(
437 self._src_comps_and_specs, self._flt_comps_and_specs
438 )
439
440 if name in [comp_and_spec.comp.name for comp_and_spec in comps_and_specs]:
441 name += '-{}'.format(self._next_suffix)
442 self._next_suffix += 1
443
444 return name
445
446 def _create_comp(self, comp_spec):
447 comp_cls = comp_spec.component_class
448 name = self._get_unique_comp_name(comp_cls)
449 comp = self._graph.add_component(
450 comp_cls, name, comp_spec.params, comp_spec.obj, comp_spec.logging_level
451 )
452 return comp
453
454 def _get_free_muxer_input_port(self):
455 for port in self._muxer_comp.input_ports.values():
456 if not port.is_connected:
457 return port
458
459 def _connect_src_comp_port(self, component, port):
460 # if this trace collection iterator is in stream intersection
461 # mode, we need this connection:
462 #
463 # port -> trimmer -> muxer
464 #
465 # otherwise, simply:
466 #
467 # port -> muxer
468 if self._stream_intersection_mode:
469 trimmer_comp = self._create_stream_intersection_trimmer(component, port)
470 self._graph.connect_ports(port, trimmer_comp.input_ports['in'])
471 port_to_muxer = trimmer_comp.output_ports['out']
472 else:
473 port_to_muxer = port
474
475 self._graph.connect_ports(port_to_muxer, self._get_free_muxer_input_port())
476
477 def _graph_port_added(self, component, port):
478 if not self._connect_ports:
479 return
480
481 if type(port) is bt2_port._InputPortConst:
482 return
483
484 if component not in [comp.comp for comp in self._src_comps_and_specs]:
485 # do not care about non-source components (muxer, trimmer, etc.)
486 return
487
488 self._connect_src_comp_port(component, port)
489
490 def _get_greatest_operative_mip_version(self):
491 def append_comp_specs_descriptors(descriptors, comp_specs):
492 for comp_spec in comp_specs:
493 descriptors.append(
494 bt2.ComponentDescriptor(
495 comp_spec.component_class, comp_spec.params, comp_spec.obj
496 )
497 )
498
499 descriptors = []
500 append_comp_specs_descriptors(descriptors, self._src_comp_specs)
501 append_comp_specs_descriptors(descriptors, self._flt_comp_specs)
502
503 if self._stream_intersection_mode:
504 # we also need at least one `flt.utils.trimmer` component
505 comp_spec = ComponentSpec.from_named_plugin_and_component_class(
506 'utils', 'trimmer'
507 )
508 append_comp_specs_descriptors(descriptors, [comp_spec])
509
510 mip_version = bt2.get_greatest_operative_mip_version(descriptors)
511
512 if mip_version is None:
513 msg = 'failed to find an operative message interchange protocol version (components are not interoperable)'
514 raise RuntimeError(msg)
515
516 return mip_version
517
518 def _build_graph(self):
519 self._graph = bt2.Graph(self._get_greatest_operative_mip_version())
520 self._graph.add_port_added_listener(self._graph_port_added)
521 self._muxer_comp = self._create_muxer()
522
523 if self._begin_ns is not None or self._end_ns is not None:
524 trimmer_comp = self._create_trimmer(self._begin_ns, self._end_ns, 'trimmer')
525 self._graph.connect_ports(
526 self._muxer_comp.output_ports['out'], trimmer_comp.input_ports['in']
527 )
528 last_flt_out_port = trimmer_comp.output_ports['out']
529 else:
530 last_flt_out_port = self._muxer_comp.output_ports['out']
531
532 # create extra filter components (chained)
533 for comp_spec in self._flt_comp_specs:
534 comp = self._create_comp(comp_spec)
535 self._flt_comps_and_specs.append(_ComponentAndSpec(comp, comp_spec))
536
537 # connect the extra filter chain
538 for comp_and_spec in self._flt_comps_and_specs:
539 in_port = list(comp_and_spec.comp.input_ports.values())[0]
540 out_port = list(comp_and_spec.comp.output_ports.values())[0]
541 self._graph.connect_ports(last_flt_out_port, in_port)
542 last_flt_out_port = out_port
543
544 # Here we create the components, self._graph_port_added() is
545 # called when they add ports, but the callback returns early
546 # because self._connect_ports is False. This is because the
547 # self._graph_port_added() could not find the associated source
548 # component specification in self._src_comps_and_specs because
549 # it does not exist yet (it needs the created component to
550 # exist).
551 for comp_spec in self._src_comp_specs:
552 comp = self._create_comp(comp_spec)
553 self._src_comps_and_specs.append(_ComponentAndSpec(comp, comp_spec))
554
555 if self._stream_intersection_mode:
556 self._compute_stream_intersections()
557
558 # Now we connect the ports which exist at this point. We allow
559 # self._graph_port_added() to automatically connect _new_ ports.
560 self._connect_ports = True
561
562 for comp_and_spec in self._src_comps_and_specs:
563 # Keep a separate list because comp_and_spec.output_ports
564 # could change during the connection of one of its ports.
565 # Any new port is handled by self._graph_port_added().
566 out_ports = [port for port in comp_and_spec.comp.output_ports.values()]
567
568 for out_port in out_ports:
569 if out_port.is_connected:
570 continue
571
572 self._connect_src_comp_port(comp_and_spec.comp, out_port)
573
574 # Add the proxy sink, passing our message list to share consumed
575 # messages with this trace collection message iterator.
576 sink = self._graph.add_component(
577 _TraceCollectionMessageIteratorProxySink, 'proxy-sink', obj=self._msg_list
578 )
579 sink_in_port = sink.input_ports['in']
580
581 # connect last filter to proxy sink
582 self._graph.connect_ports(last_flt_out_port, sink_in_port)
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