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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 | import bt2.connection | |
25 | import bt2.component | |
26 | import functools | |
27 | import bt2.port | |
28 | import bt2 | |
29 | ||
30 | ||
31 | class GraphListenerType: | |
32 | PORT_ADDED = 0 | |
33 | PORT_REMOVED = 1 | |
34 | PORTS_CONNECTED = 2 | |
35 | PORTS_DISCONNECTED = 3 | |
36 | ||
37 | ||
38 | def _graph_port_added_listener_from_native(user_listener, port_ptr): | |
39 | try: | |
40 | port = bt2.port._create_from_ptr(port_ptr) | |
41 | port._get() | |
42 | user_listener(port) | |
43 | except: | |
44 | pass | |
45 | ||
46 | ||
47 | def _graph_port_removed_listener_from_native(user_listener, port_ptr): | |
48 | try: | |
49 | port = bt2.port._create_from_ptr(port_ptr) | |
50 | port._get() | |
51 | user_listener(port) | |
52 | except: | |
53 | pass | |
54 | ||
55 | ||
56 | def _graph_ports_connected_listener_from_native(user_listener, | |
57 | upstream_port_ptr, | |
58 | downstream_port_ptr): | |
59 | try: | |
60 | upstream_port = bt2.port._create_from_ptr(upstream_port_ptr) | |
61 | upstream_port._get() | |
62 | downstream_port = bt2.port._create_from_ptr(downstream_port_ptr) | |
63 | downstream_port._get() | |
64 | user_listener(upstream_port, downstream_port) | |
65 | except: | |
66 | pass | |
67 | ||
68 | ||
69 | def _graph_ports_disconnected_listener_from_native(user_listener, | |
70 | upstream_comp_ptr, | |
71 | downstream_comp_ptr, | |
72 | upstream_port_ptr, | |
73 | downstream_port_ptr): | |
74 | try: | |
75 | upstream_comp = bt2.component._create_generic_component_from_ptr(upstream_comp_ptr) | |
76 | upstream_comp._get() | |
77 | downstream_comp = bt2.component._create_generic_component_from_ptr(downstream_comp_ptr) | |
78 | downstream_comp._get() | |
79 | upstream_port = bt2.port._create_from_ptr(upstream_port_ptr) | |
80 | upstream_port._get() | |
81 | downstream_port = bt2.port._create_from_ptr(downstream_port_ptr) | |
82 | downstream_port._get() | |
83 | user_listener(upstream_comp, downstream_comp, upstream_port, | |
84 | downstream_port) | |
85 | except: | |
86 | pass | |
87 | ||
88 | ||
89 | class Graph(object._Object): | |
90 | def __init__(self): | |
91 | ptr = native_bt.graph_create() | |
92 | ||
93 | if ptr is None: | |
94 | raise bt2.CreationError('cannot create graph object') | |
95 | ||
96 | super().__init__(ptr) | |
97 | ||
98 | def _handle_status(self, status, gen_error_msg): | |
99 | if status == native_bt.GRAPH_STATUS_COMPONENT_REFUSES_PORT_CONNECTION: | |
100 | raise bt2.PortConnectionRefused | |
101 | elif status == native_bt.GRAPH_STATUS_CANCELED: | |
102 | raise bt2.GraphCanceled | |
103 | elif status == native_bt.GRAPH_STATUS_END: | |
104 | raise bt2.Stop | |
105 | elif status == native_bt.GRAPH_STATUS_AGAIN: | |
106 | raise bt2.TryAgain | |
107 | elif status == native_bt.GRAPH_STATUS_NO_SINK: | |
108 | raise bt2.NoSinkComponent | |
109 | elif status < 0: | |
110 | raise bt2.Error(gen_error_msg) | |
111 | ||
112 | def add_component(self, component_class, name, params=None): | |
113 | if isinstance(component_class, bt2.component._GenericComponentClass): | |
114 | cc_ptr = component_class._ptr | |
115 | elif issubclass(component_class, bt2.component._UserComponent): | |
116 | cc_ptr = component_class._cc_ptr | |
117 | else: | |
118 | raise TypeError("'{}' is not a component class".format(component_class.__class__.__name__)) | |
119 | ||
120 | utils._check_str(name) | |
121 | params = bt2.create_value(params) | |
122 | ||
123 | if params is None: | |
124 | params_ptr = None | |
125 | else: | |
126 | params_ptr = params._ptr | |
127 | ||
128 | status, comp_ptr = native_bt.graph_add_component(self._ptr, cc_ptr, | |
129 | name, params_ptr) | |
130 | self._handle_status(status, 'cannot add component to graph') | |
131 | assert(comp_ptr) | |
132 | return bt2.component._create_generic_component_from_ptr(comp_ptr) | |
133 | ||
134 | def connect_ports(self, upstream_port, downstream_port): | |
135 | utils._check_type(upstream_port, bt2.port._OutputPort) | |
136 | utils._check_type(downstream_port, bt2.port._InputPort) | |
137 | status, conn_ptr = native_bt.graph_connect_ports(self._ptr, | |
138 | upstream_port._ptr, | |
139 | downstream_port._ptr) | |
140 | self._handle_status(status, 'cannot connect component ports within graph') | |
141 | assert(conn_ptr) | |
142 | return bt2.connection._Connection._create_from_ptr(conn_ptr) | |
143 | ||
144 | def add_listener(self, listener_type, listener): | |
145 | if not hasattr(listener, '__call__'): | |
146 | raise TypeError("'listener' parameter is not callable") | |
147 | ||
148 | if listener_type == GraphListenerType.PORT_ADDED: | |
149 | fn = native_bt.py3_graph_add_port_added_listener | |
150 | listener_from_native = functools.partial(_graph_port_added_listener_from_native, | |
151 | listener) | |
152 | elif listener_type == GraphListenerType.PORT_REMOVED: | |
153 | fn = native_bt.py3_graph_add_port_removed_listener | |
154 | listener_from_native = functools.partial(_graph_port_removed_listener_from_native, | |
155 | listener) | |
156 | elif listener_type == GraphListenerType.PORTS_CONNECTED: | |
157 | fn = native_bt.py3_graph_add_ports_connected_listener | |
158 | listener_from_native = functools.partial(_graph_ports_connected_listener_from_native, | |
159 | listener) | |
160 | elif listener_type == GraphListenerType.PORTS_DISCONNECTED: | |
161 | fn = native_bt.py3_graph_add_ports_disconnected_listener | |
162 | listener_from_native = functools.partial(_graph_ports_disconnected_listener_from_native, | |
163 | listener) | |
164 | else: | |
165 | raise TypeError | |
166 | ||
167 | listener_id = fn(self._ptr, listener_from_native) | |
168 | utils._handle_ret(listener_id, 'cannot add listener to graph object') | |
169 | return bt2._ListenerHandle(listener_id, self) | |
170 | ||
171 | def run(self): | |
172 | status = native_bt.graph_run(self._ptr) | |
173 | ||
174 | if status == native_bt.GRAPH_STATUS_END: | |
175 | return | |
176 | ||
177 | self._handle_status(status, 'graph object stopped running because of an unexpected error') | |
178 | ||
179 | def cancel(self): | |
180 | status = native_bt.graph_cancel(self._ptr) | |
181 | self._handle_status(status, 'cannot cancel graph object') | |
182 | ||
183 | @property | |
184 | def is_canceled(self): | |
185 | is_canceled = native_bt.graph_is_canceled(self._ptr) | |
186 | assert(is_canceled >= 0) | |
187 | return is_canceled > 0 | |
188 | ||
189 | def __eq__(self, other): | |
190 | if type(other) is not type(self): | |
191 | return False | |
192 | ||
193 | return self.addr == other.addr |