src/bindings/python/bt2/bt2/graph.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 native_bt, object, utils
  24 from bt2 import interrupter as bt2_interrupter
  25 from bt2 import connection as bt2_connection
  26 from bt2 import component as bt2_component
  27 import functools
  28 from bt2 import port as bt2_port
  29 from bt2 import logging as bt2_logging
  30 import bt2
  31
  32
  33 def _graph_port_added_listener_from_native(
  34     user_listener, component_ptr, component_type, port_ptr, port_type
  35 ):
  36     component = bt2_component._create_component_from_ptr_and_get_ref(
  37         component_ptr, component_type
  38     )
  39     port = bt2_port._create_from_ptr_and_get_ref(port_ptr, port_type)
  40     user_listener(component, port)
  41
  42
  43 def _graph_ports_connected_listener_from_native(
  44     user_listener,
  45     upstream_component_ptr,
  46     upstream_component_type,
  47     upstream_port_ptr,
  48     downstream_component_ptr,
  49     downstream_component_type,
  50     downstream_port_ptr,
  51 ):
  52     upstream_component = bt2_component._create_component_from_ptr_and_get_ref(
  53         upstream_component_ptr, upstream_component_type
  54     )
  55     upstream_port = bt2_port._create_from_ptr_and_get_ref(
  56         upstream_port_ptr, native_bt.PORT_TYPE_OUTPUT
  57     )
  58     downstream_component = bt2_component._create_component_from_ptr_and_get_ref(
  59         downstream_component_ptr, downstream_component_type
  60     )
  61     downstream_port = bt2_port._create_from_ptr_and_get_ref(
  62         downstream_port_ptr, native_bt.PORT_TYPE_INPUT
  63     )
  64     user_listener(
  65         upstream_component, upstream_port, downstream_component, downstream_port
  66     )
  67
  68
  69 class Graph(object._SharedObject):
  70     _get_ref = staticmethod(native_bt.graph_get_ref)
  71     _put_ref = staticmethod(native_bt.graph_put_ref)
  72
  73     def __init__(self):
  74         ptr = native_bt.graph_create()
  75
  76         if ptr is None:
  77             raise bt2._MemoryError('cannot create graph object')
  78
  79         super().__init__(ptr)
  80
  81     def add_component(
  82         self,
  83         component_class,
  84         name,
  85         params=None,
  86         obj=None,
  87         logging_level=bt2_logging.LoggingLevel.NONE,
  88     ):
  89         if isinstance(component_class, bt2_component._SourceComponentClass):
  90             cc_ptr = component_class._ptr
  91             add_fn = native_bt.bt2_graph_add_source_component
  92             cc_type = native_bt.COMPONENT_CLASS_TYPE_SOURCE
  93         elif isinstance(component_class, bt2_component._FilterComponentClass):
  94             cc_ptr = component_class._ptr
  95             add_fn = native_bt.bt2_graph_add_filter_component
  96             cc_type = native_bt.COMPONENT_CLASS_TYPE_FILTER
  97         elif isinstance(component_class, bt2_component._SinkComponentClass):
  98             cc_ptr = component_class._ptr
  99             add_fn = native_bt.bt2_graph_add_sink_component
 100             cc_type = native_bt.COMPONENT_CLASS_TYPE_SINK
 101         elif issubclass(component_class, bt2_component._UserSourceComponent):
 102             cc_ptr = component_class._bt_cc_ptr
 103             add_fn = native_bt.bt2_graph_add_source_component
 104             cc_type = native_bt.COMPONENT_CLASS_TYPE_SOURCE
 105         elif issubclass(component_class, bt2_component._UserSinkComponent):
 106             cc_ptr = component_class._bt_cc_ptr
 107             add_fn = native_bt.bt2_graph_add_sink_component
 108             cc_type = native_bt.COMPONENT_CLASS_TYPE_SINK
 109         elif issubclass(component_class, bt2_component._UserFilterComponent):
 110             cc_ptr = component_class._bt_cc_ptr
 111             add_fn = native_bt.bt2_graph_add_filter_component
 112             cc_type = native_bt.COMPONENT_CLASS_TYPE_FILTER
 113         else:
 114             raise TypeError(
 115                 "'{}' is not a component class".format(
 116                     component_class.__class__.__name__
 117                 )
 118             )
 119
 120         utils._check_str(name)
 121         utils._check_log_level(logging_level)
 122         base_cc_ptr = component_class._bt_component_class_ptr()
 123
 124         if obj is not None and not native_bt.bt2_is_python_component_class(base_cc_ptr):
 125             raise ValueError('cannot pass a Python object to a non-Python component')
 126
 127         params = bt2.create_value(params)
 128         params_ptr = params._ptr if params is not None else None
 129
 130         status, comp_ptr = add_fn(
 131             self._ptr, cc_ptr, name, params_ptr, obj, logging_level
 132         )
 133         utils._handle_func_status(status, 'cannot add component to graph')
 134         assert comp_ptr
 135         return bt2_component._create_component_from_ptr(comp_ptr, cc_type)
 136
 137     def connect_ports(self, upstream_port, downstream_port):
 138         utils._check_type(upstream_port, bt2_port._OutputPort)
 139         utils._check_type(downstream_port, bt2_port._InputPort)
 140         status, conn_ptr = native_bt.graph_connect_ports(
 141             self._ptr, upstream_port._ptr, downstream_port._ptr
 142         )
 143         utils._handle_func_status(status, 'cannot connect component ports within graph')
 144         assert conn_ptr
 145         return bt2_connection._Connection._create_from_ptr(conn_ptr)
 146
 147     def add_port_added_listener(self, listener):
 148         if not callable(listener):
 149             raise TypeError("'listener' parameter is not callable")
 150
 151         fn = native_bt.bt2_graph_add_port_added_listener
 152         listener_from_native = functools.partial(
 153             _graph_port_added_listener_from_native, listener
 154         )
 155
 156         listener_ids = fn(self._ptr, listener_from_native)
 157         if listener_ids is None:
 158             raise bt2._Error('cannot add listener to graph object')
 159
 160         return utils._ListenerHandle(listener_ids, self)
 161
 162     def add_ports_connected_listener(self, listener):
 163         if not callable(listener):
 164             raise TypeError("'listener' parameter is not callable")
 165
 166         fn = native_bt.bt2_graph_add_ports_connected_listener
 167         listener_from_native = functools.partial(
 168             _graph_ports_connected_listener_from_native, listener
 169         )
 170
 171         listener_ids = fn(self._ptr, listener_from_native)
 172         if listener_ids is None:
 173             raise bt2._Error('cannot add listener to graph object')
 174
 175         return utils._ListenerHandle(listener_ids, self)
 176
 177     def run_once(self):
 178         status = native_bt.graph_run_once(self._ptr)
 179         utils._handle_func_status(status, 'graph object could not run once')
 180
 181     def run(self):
 182         status = native_bt.graph_run(self._ptr)
 183
 184         try:
 185             utils._handle_func_status(status, 'graph object stopped running')
 186         except bt2.Stop:
 187             # done
 188             return
 189         except Exception:
 190             raise
 191
 192     def add_interrupter(self, interrupter):
 193         utils._check_type(interrupter, bt2_interrupter.Interrupter)
 194         native_bt.graph_add_interrupter(self._ptr, interrupter._ptr)
 195
 196     def interrupt(self):
 197         native_bt.graph_interrupt(self._ptr)