-# The MIT License (MIT)
-#
-# Copyright (c) 2017 Philippe Proulx <pproulx@efficios.com>
-#
-# Permission is hereby granted, free of charge, to any person obtaining a copy
-# of this software and associated documentation files (the "Software"), to deal
-# in the Software without restriction, including without limitation the rights
-# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
-# copies of the Software, and to permit persons to whom the Software is
-# furnished to do so, subject to the following conditions:
-#
-# The above copyright notice and this permission notice shall be included in
-# all copies or substantial portions of the Software.
-#
-# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
-# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
-# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
-# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
-# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
-# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
-# THE SOFTWARE.
-
-from bt2 import native_bt, object, utils
-import bt2.connection
-import bt2.component
-import functools
-import bt2.port
-import bt2
-
-
-def _graph_port_added_listener_from_native(user_listener,
- component_ptr, component_type,
- port_ptr, port_type):
- component = bt2.component._create_component_from_ptr_and_get_ref(component_ptr, component_type)
- port = bt2.port._create_from_ptr_and_get_ref(port_ptr, port_type)
- user_listener(component, port)
-
-
-def _graph_ports_connected_listener_from_native(user_listener,
- upstream_component_ptr, upstream_component_type,
- upstream_port_ptr,
- downstream_component_ptr, downstream_component_type,
- downstream_port_ptr):
- upstream_component = bt2.component._create_component_from_ptr_and_get_ref(
- upstream_component_ptr, upstream_component_type)
- upstream_port = bt2.port._create_from_ptr_and_get_ref(
- upstream_port_ptr, native_bt.PORT_TYPE_OUTPUT)
- downstream_component = bt2.component._create_component_from_ptr_and_get_ref(
- downstream_component_ptr, downstream_component_type)
- downstream_port = bt2.port._create_from_ptr_and_get_ref(
- downstream_port_ptr, native_bt.PORT_TYPE_INPUT)
- user_listener(upstream_component, upstream_port, downstream_component, downstream_port)
-
-
-class Graph(object._SharedObject):
- _get_ref = staticmethod(native_bt.graph_get_ref)
- _put_ref = staticmethod(native_bt.graph_put_ref)
-
- def __init__(self):
- ptr = native_bt.graph_create()
-
- if ptr is None:
- raise bt2.CreationError('cannot create graph object')
-
- super().__init__(ptr)
-
- def _handle_status(self, status, gen_error_msg):
- if status == native_bt.GRAPH_STATUS_COMPONENT_REFUSES_PORT_CONNECTION:
- raise bt2.PortConnectionRefused
- elif status == native_bt.GRAPH_STATUS_CANCELED:
- raise bt2.GraphCanceled
- elif status == native_bt.GRAPH_STATUS_END:
- raise bt2.Stop
- elif status == native_bt.GRAPH_STATUS_AGAIN:
- raise bt2.TryAgain
- elif status < 0:
- raise bt2.Error(gen_error_msg)
-
- def add_component(self, component_class, name, params=None):
- if isinstance(component_class, bt2.component._GenericSourceComponentClass):
- cc_ptr = component_class._ptr
- add_fn = native_bt.graph_add_source_component
- cc_type = native_bt.COMPONENT_CLASS_TYPE_SOURCE
- elif isinstance(component_class, bt2.component._GenericFilterComponentClass):
- cc_ptr = component_class._ptr
- add_fn = native_bt.graph_add_filter_component
- cc_type = native_bt.COMPONENT_CLASS_TYPE_FILTER
- elif isinstance(component_class, bt2.component._GenericSinkComponentClass):
- cc_ptr = component_class._ptr
- add_fn = native_bt.graph_add_sink_component
- cc_type = native_bt.COMPONENT_CLASS_TYPE_SINK
- elif issubclass(component_class, bt2.component._UserSourceComponent):
- cc_ptr = component_class._cc_ptr
- add_fn = native_bt.graph_add_source_component
- cc_type = native_bt.COMPONENT_CLASS_TYPE_SOURCE
- elif issubclass(component_class, bt2.component._UserSinkComponent):
- cc_ptr = component_class._cc_ptr
- add_fn = native_bt.graph_add_sink_component
- cc_type = native_bt.COMPONENT_CLASS_TYPE_SINK
- elif issubclass(component_class, bt2.component._UserFilterComponent):
- cc_ptr = component_class._cc_ptr
- add_fn = native_bt.graph_add_filter_component
- cc_type = native_bt.COMPONENT_CLASS_TYPE_FILTER
- else:
- raise TypeError("'{}' is not a component class".format(
- component_class.__class__.__name__))
-
- utils._check_str(name)
- params = bt2.create_value(params)
-
- params_ptr = params._ptr if params is not None else None
-
- status, comp_ptr = add_fn(self._ptr, cc_ptr, name, params_ptr)
- self._handle_status(status, 'cannot add component to graph')
- assert comp_ptr
- return bt2.component._create_component_from_ptr(comp_ptr, cc_type)
-
- def connect_ports(self, upstream_port, downstream_port):
- utils._check_type(upstream_port, bt2.port._OutputPort)
- utils._check_type(downstream_port, bt2.port._InputPort)
- status, conn_ptr = native_bt.graph_connect_ports(self._ptr,
- upstream_port._ptr,
- downstream_port._ptr)
- self._handle_status(status, 'cannot connect component ports within graph')
- assert(conn_ptr)
- return bt2.connection._Connection._create_from_ptr(conn_ptr)
-
- def add_port_added_listener(self, listener):
- if not callable(listener):
- raise TypeError("'listener' parameter is not callable")
-
- fn = native_bt.py3_graph_add_port_added_listener
- listener_from_native = functools.partial(_graph_port_added_listener_from_native,
- listener)
-
- listener_ids = fn(self._ptr, listener_from_native)
- if listener_ids is None:
- utils._raise_bt2_error('cannot add listener to graph object')
- return bt2._ListenerHandle(listener_ids, self)
-
- def add_ports_connected_listener(self, listener):
- if not callable(listener):
- raise TypeError("'listener' parameter is not callable")
-
- fn = native_bt.py3_graph_add_ports_connected_listener
- listener_from_native = functools.partial(_graph_ports_connected_listener_from_native,
- listener)
-
- listener_ids = fn(self._ptr, listener_from_native)
- if listener_ids is None:
- utils._raise_bt2_error('cannot add listener to graph object')
- return bt2._ListenerHandle(listener_ids, self)
-
- def run(self):
- status = native_bt.graph_run(self._ptr)
-
- if status == native_bt.GRAPH_STATUS_END:
- return
-
- self._handle_status(status, 'graph object stopped running because of an unexpected error')
-
- def cancel(self):
- status = native_bt.graph_cancel(self._ptr)
- self._handle_status(status, 'cannot cancel graph object')
-
- @property
- def is_canceled(self):
- is_canceled = native_bt.graph_is_canceled(self._ptr)
- assert(is_canceled >= 0)
- return is_canceled > 0
-
- def create_output_port_message_iterator(self, output_port):
- utils._check_type(output_port, bt2.port._OutputPort)
- msg_iter_ptr = native_bt.port_output_message_iterator_create(self._ptr, output_port._ptr)
-
- if msg_iter_ptr is None:
- raise bt2.CreationError('cannot create output port message iterator')
-
- return bt2.message_iterator._OutputPortMessageIterator(msg_iter_ptr)
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