| 1 | # SPDX-License-Identifier: MIT |
| 2 | # |
| 3 | # Copyright (c) 2017 Philippe Proulx <pproulx@efficios.com> |
| 4 | |
| 5 | from bt2 import native_bt, object, utils |
| 6 | from bt2 import interrupter as bt2_interrupter |
| 7 | from bt2 import connection as bt2_connection |
| 8 | from bt2 import component as bt2_component |
| 9 | import functools |
| 10 | from bt2 import port as bt2_port |
| 11 | from bt2 import logging as bt2_logging |
| 12 | import bt2 |
| 13 | |
| 14 | |
| 15 | def _graph_port_added_listener_from_native( |
| 16 | user_listener, component_ptr, component_type, port_ptr, port_type |
| 17 | ): |
| 18 | component = bt2_component._create_component_from_const_ptr_and_get_ref( |
| 19 | component_ptr, component_type |
| 20 | ) |
| 21 | port = bt2_port._create_from_const_ptr_and_get_ref(port_ptr, port_type) |
| 22 | user_listener(component, port) |
| 23 | |
| 24 | |
| 25 | class Graph(object._SharedObject): |
| 26 | _get_ref = staticmethod(native_bt.graph_get_ref) |
| 27 | _put_ref = staticmethod(native_bt.graph_put_ref) |
| 28 | |
| 29 | def __init__(self, mip_version=0): |
| 30 | utils._check_uint64(mip_version) |
| 31 | |
| 32 | if mip_version > bt2.get_maximal_mip_version(): |
| 33 | raise ValueError("unknown MIP version {}".format(mip_version)) |
| 34 | |
| 35 | ptr = native_bt.graph_create(mip_version) |
| 36 | |
| 37 | if ptr is None: |
| 38 | raise bt2._MemoryError("cannot create graph object") |
| 39 | |
| 40 | super().__init__(ptr) |
| 41 | |
| 42 | # list of listener partials to keep a reference as long as |
| 43 | # this graph exists |
| 44 | self._listener_partials = [] |
| 45 | |
| 46 | def add_component( |
| 47 | self, |
| 48 | component_class, |
| 49 | name, |
| 50 | params=None, |
| 51 | obj=None, |
| 52 | logging_level=bt2_logging.LoggingLevel.NONE, |
| 53 | ): |
| 54 | if isinstance(component_class, bt2_component._SourceComponentClassConst): |
| 55 | cc_ptr = component_class._ptr |
| 56 | add_fn = native_bt.bt2_graph_add_source_component |
| 57 | cc_type = native_bt.COMPONENT_CLASS_TYPE_SOURCE |
| 58 | elif isinstance(component_class, bt2_component._FilterComponentClassConst): |
| 59 | cc_ptr = component_class._ptr |
| 60 | add_fn = native_bt.bt2_graph_add_filter_component |
| 61 | cc_type = native_bt.COMPONENT_CLASS_TYPE_FILTER |
| 62 | elif isinstance(component_class, bt2_component._SinkComponentClassConst): |
| 63 | cc_ptr = component_class._ptr |
| 64 | add_fn = native_bt.bt2_graph_add_sink_component |
| 65 | cc_type = native_bt.COMPONENT_CLASS_TYPE_SINK |
| 66 | elif issubclass(component_class, bt2_component._UserSourceComponent): |
| 67 | cc_ptr = component_class._bt_cc_ptr |
| 68 | add_fn = native_bt.bt2_graph_add_source_component |
| 69 | cc_type = native_bt.COMPONENT_CLASS_TYPE_SOURCE |
| 70 | elif issubclass(component_class, bt2_component._UserSinkComponent): |
| 71 | cc_ptr = component_class._bt_cc_ptr |
| 72 | add_fn = native_bt.bt2_graph_add_sink_component |
| 73 | cc_type = native_bt.COMPONENT_CLASS_TYPE_SINK |
| 74 | elif issubclass(component_class, bt2_component._UserFilterComponent): |
| 75 | cc_ptr = component_class._bt_cc_ptr |
| 76 | add_fn = native_bt.bt2_graph_add_filter_component |
| 77 | cc_type = native_bt.COMPONENT_CLASS_TYPE_FILTER |
| 78 | else: |
| 79 | raise TypeError( |
| 80 | "'{}' is not a component class".format( |
| 81 | component_class.__class__.__name__ |
| 82 | ) |
| 83 | ) |
| 84 | |
| 85 | utils._check_str(name) |
| 86 | utils._check_log_level(logging_level) |
| 87 | base_cc_ptr = component_class._bt_component_class_ptr() |
| 88 | |
| 89 | if obj is not None and not native_bt.bt2_is_python_component_class(base_cc_ptr): |
| 90 | raise ValueError("cannot pass a Python object to a non-Python component") |
| 91 | |
| 92 | if params is not None and not isinstance(params, (dict, bt2.MapValue)): |
| 93 | raise TypeError("'params' parameter is not a 'dict' or a 'bt2.MapValue'.") |
| 94 | |
| 95 | params = bt2.create_value(params) |
| 96 | |
| 97 | params_ptr = params._ptr if params is not None else None |
| 98 | |
| 99 | status, comp_ptr = add_fn( |
| 100 | self._ptr, cc_ptr, name, params_ptr, obj, logging_level |
| 101 | ) |
| 102 | utils._handle_func_status(status, "cannot add component to graph") |
| 103 | assert comp_ptr |
| 104 | return bt2_component._create_component_from_const_ptr_and_get_ref( |
| 105 | comp_ptr, cc_type |
| 106 | ) |
| 107 | |
| 108 | def connect_ports(self, upstream_port, downstream_port): |
| 109 | utils._check_type(upstream_port, bt2_port._OutputPortConst) |
| 110 | utils._check_type(downstream_port, bt2_port._InputPortConst) |
| 111 | status, conn_ptr = native_bt.graph_connect_ports( |
| 112 | self._ptr, upstream_port._ptr, downstream_port._ptr |
| 113 | ) |
| 114 | utils._handle_func_status(status, "cannot connect component ports within graph") |
| 115 | assert conn_ptr |
| 116 | return bt2_connection._ConnectionConst._create_from_ptr_and_get_ref(conn_ptr) |
| 117 | |
| 118 | def add_port_added_listener(self, listener): |
| 119 | if not callable(listener): |
| 120 | raise TypeError("'listener' parameter is not callable") |
| 121 | |
| 122 | fn = native_bt.bt2_graph_add_port_added_listener |
| 123 | listener_from_native = functools.partial( |
| 124 | _graph_port_added_listener_from_native, listener |
| 125 | ) |
| 126 | |
| 127 | listener_ids = fn(self._ptr, listener_from_native) |
| 128 | if listener_ids is None: |
| 129 | raise bt2._Error("cannot add listener to graph object") |
| 130 | |
| 131 | # keep the partial's reference |
| 132 | self._listener_partials.append(listener_from_native) |
| 133 | |
| 134 | def run_once(self): |
| 135 | status = native_bt.graph_run_once(self._ptr) |
| 136 | utils._handle_func_status(status, "graph object could not run once") |
| 137 | |
| 138 | def run(self): |
| 139 | status = native_bt.graph_run(self._ptr) |
| 140 | utils._handle_func_status(status, "graph object stopped running") |
| 141 | |
| 142 | def add_interrupter(self, interrupter): |
| 143 | utils._check_type(interrupter, bt2_interrupter.Interrupter) |
| 144 | native_bt.graph_add_interrupter(self._ptr, interrupter._ptr) |
| 145 | |
| 146 | @property |
| 147 | def default_interrupter(self): |
| 148 | ptr = native_bt.graph_borrow_default_interrupter(self._ptr) |
| 149 | return bt2_interrupter.Interrupter._create_from_ptr_and_get_ref(ptr) |