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"""
Copyright 2008-2015 Free Software Foundation, Inc.
This file is part of GNU Radio
GNU Radio Companion is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License
as published by the Free Software Foundation; either version 2
of the License, or (at your option) any later version.
GNU Radio Companion is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
"""
from __future__ import absolute_import
import collections
from six.moves import range
from . import Constants
from .Element import Element, lazy_property
class Connection(Element):
is_connection = True
def __init__(self, parent, porta, portb):
"""
Make a new connection given the parent and 2 ports.
Args:
flow_graph: the parent of this element
porta: a port (any direction)
portb: a port (any direction)
@throws Error cannot make connection
Returns:
a new connection
"""
Element.__init__(self, parent)
source, sink = self._get_sink_source(porta, portb)
self.source_port = source
self.sink_port = sink
# Ensure that this connection (source -> sink) is unique
if self in self.parent_flowgraph.connections:
raise LookupError('This connection between source and sink is not unique.')
if self.is_bus():
self._make_bus_connect()
def __eq__(self, other):
if not isinstance(other, self.__class__):
return NotImplemented
return self.source_port == other.source_port and self.sink_port == other.sink_port
@staticmethod
def _get_sink_source(porta, portb):
source = sink = None
# Separate the source and sink
for port in (porta, portb):
if port.is_source:
source = port
if port.is_sink:
sink = port
if not source:
raise ValueError('Connection could not isolate source')
if not sink:
raise ValueError('Connection could not isolate sink')
return source, sink
@lazy_property
def source_block(self):
return self.source_port.parent_block
@lazy_property
def sink_block(self):
return self.sink_port.parent_block
@property
def enabled(self):
"""
Get the enabled state of this connection.
Returns:
true if source and sink blocks are enabled
"""
return self.source_block.enabled and self.sink_block.enabled
def __str__(self):
return 'Connection (\n\t{}\n\t\t{}\n\t{}\n\t\t{}\n)'.format(
self.source_block, self.source_port, self.sink_block, self.sink_port,
)
def is_bus(self):
return self.source_port.get_type() == 'bus'
def validate(self):
"""
Validate the connections.
The ports must match in io size.
"""
Element.validate(self)
platform = self.parent_platform
source_domain = self.source_port.domain
sink_domain = self.sink_port.domain
if (source_domain, sink_domain) not in platform.connection_templates:
self.add_error_message('No connection known for domains "{}", "{}"'.format(
source_domain, sink_domain))
too_many_other_sinks = (
not platform.domains.get(source_domain, []).get('multiple_sinks', False) and
len(self.source_port.get_enabled_connections()) > 1
)
too_many_other_sources = (
not platform.domains.get(sink_domain, []).get('multiple_sources', False) and
len(self.sink_port.get_enabled_connections()) > 1
)
if too_many_other_sinks:
self.add_error_message(
'Domain "{}" can have only one downstream block'.format(source_domain))
if too_many_other_sources:
self.add_error_message(
'Domain "{}" can have only one upstream block'.format(sink_domain))
source_size = Constants.TYPE_TO_SIZEOF[self.source_port.get_type()] * self.source_port.get_vlen()
sink_size = Constants.TYPE_TO_SIZEOF[self.sink_port.get_type()] * self.sink_port.get_vlen()
if source_size != sink_size:
self.add_error_message('Source IO size "{}" does not match sink IO size "{}".'.format(source_size, sink_size))
##############################################
# Import/Export Methods
##############################################
def export_data(self):
"""
Export this connection's info.
Returns:
a nested data odict
"""
n = collections.OrderedDict()
n['source_block_id'] = self.source_block.get_id()
n['sink_block_id'] = self.sink_block.get_id()
n['source_key'] = self.source_port.key
n['sink_key'] = self.sink_port.key
return n
def _make_bus_connect(self):
source, sink = self.source_port, self.sink_port
if source.get_type() == sink.get_type() == 'bus':
raise ValueError('busses must get with busses')
sources = source.get_associated_ports()
sinks = sink.get_associated_ports()
if len(sources) != len(sinks):
raise ValueError('port connections must have same cardinality')
for ports in zip(sources, sinks):
self.parent_flowgraph.connect(*ports)
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