# 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, print_function
import collections
import imp
import itertools
import sys
from operator import methodcaller, attrgetter
from . import Messages, blocks
from .Constants import FLOW_GRAPH_FILE_FORMAT_VERSION
from .base import Element
from .utils import expr_utils
from .utils.backports import shlex
class FlowGraph(Element):
is_flow_graph = True
def __init__(self, parent):
"""
Make a flow graph from the arguments.
Args:
parent: a platforms with blocks and element factories
Returns:
the flow graph object
"""
Element.__init__(self, parent)
self._options_block = self.parent_platform.make_block(self, 'options')
self.blocks = [self._options_block]
self.connections = set()
self._eval_cache = {}
self.namespace = {}
self.grc_file_path = ''
def __str__(self):
return 'FlowGraph - {}({})'.format(self.get_option('title'), self.get_option('id'))
def imports(self):
"""
Get a set of all import statements in this flow graph namespace.
Returns:
a list of import statements
"""
return [block.templates.render('imports') for block in self.iter_enabled_blocks()]
def get_variables(self):
"""
Get a list of all variables in this flow graph namespace.
Exclude parameterized variables.
Returns:
a sorted list of variable blocks in order of dependency (indep -> dep)
"""
variables = [block for block in self.iter_enabled_blocks() if block.is_variable]
return expr_utils.sort_objects(variables, attrgetter('name'), methodcaller('get_var_make'))
def get_parameters(self):
"""
Get a list of all parameterized variables in this flow graph namespace.
Returns:
a list of parameterized variables
"""
parameters = [b for b in self.iter_enabled_blocks() if b.key == 'parameter']
return parameters
def get_monitors(self):
"""
Get a list of all ControlPort monitors
"""
monitors = [b for b in self.iter_enabled_blocks() if 'ctrlport_monitor' in b.key]
return monitors
def get_python_modules(self):
"""Iterate over custom code block ID and Source"""
for block in self.iter_enabled_blocks():
if block.key == 'epy_module':
yield block.name, block.params[1].get_value()
def iter_enabled_blocks(self):
"""
Get an iterator of all blocks that are enabled and not bypassed.
"""
return (block for block in self.blocks if block.enabled)
def get_enabled_blocks(self):
"""
Get a list of all blocks that are enabled and not bypassed.
Returns:
a list of blocks
"""
return list(self.iter_enabled_blocks())
def get_bypassed_blocks(self):
"""
Get a list of all blocks that are bypassed.
Returns:
a list of blocks
"""
return [block for block in self.blocks if block.get_bypassed()]
def get_enabled_connections(self):
"""
Get a list of all connections that are enabled.
Returns:
a list of connections
"""
return [connection for connection in self.connections if connection.enabled]
def get_option(self, key):
"""
Get the option for a given key.
The option comes from the special options block.
Args:
key: the param key for the options block
Returns:
the value held by that param
"""
return self._options_block.params[key].get_evaluated()
def get_run_command(self, file_path, split=False):
run_command = self.get_option('run_command')
try:
run_command = run_command.format(
python=shlex.quote(sys.executable),
filename=shlex.quote(file_path))
return shlex.split(run_command) if split else run_command
except Exception as e:
raise ValueError("Can't parse run command {!r}: {}".format(run_command, e))
##############################################
# Access Elements
##############################################
def get_block(self, name):
for block in self.blocks:
if block.name == name:
return block
raise KeyError('No block with name {!r}'.format(name))
def get_elements(self):
elements = list(self.blocks)
elements.extend(self.connections)
return elements
def children(self):
return itertools.chain(self.iter_enabled_blocks(), self.connections)
def rewrite(self):
"""
Flag the namespace to be renewed.
"""
self.renew_namespace()
Element.rewrite(self)
def renew_namespace(self):
namespace = {}
# Load imports
for expr in self.imports():
try:
exec(expr, namespace)
except:
pass
for id, expr in self.get_python_modules():
try:
module = imp.new_module(id)
exec(expr, module.__dict__)
namespace[id] = module
except:
pass
# Load parameters
np = {} # params don't know each other
for parameter_block in self.get_parameters():
try:
value = eval(parameter_block.params['value'].to_code(), namespace)
np[parameter_block.name] = value
except:
pass
namespace.update(np) # Merge param namespace
# Load variables
for variable_block in self.get_variables():
try:
value = eval(variable_block.value, namespace, variable_block.namespace)
namespace[variable_block.name] = value
except:
pass
self.namespace.clear()
self._eval_cache.clear()
self.namespace.update(namespace)
def evaluate(self, expr, namespace=None, local_namespace=None):
"""
Evaluate the expression.
"""
# Evaluate
if not expr:
raise Exception('Cannot evaluate empty statement.')
if namespace is not None:
return eval(expr, namespace, local_namespace)
else:
return self._eval_cache.setdefault(expr, eval(expr, self.namespace))
##############################################
# Add/remove stuff
##############################################
def new_block(self, block_id, **kwargs):
"""
Get a new block of the specified key.
Add the block to the list of elements.
Args:
block_id: the block key
Returns:
the new block or None if not found
"""
if block_id == 'options':
return self._options_block
try:
block = self.parent_platform.make_block(self, block_id, **kwargs)
self.blocks.append(block)
except KeyError:
block = None
return block
def connect(self, porta, portb):
"""
Create a connection between porta and portb.
Args:
porta: a port
portb: another port
@throw Exception bad connection
Returns:
the new connection
"""
connection = self.parent_platform.Connection(
parent=self, source=porta, sink=portb)
self.connections.add(connection)
return connection
def disconnect(self, *ports):
to_be_removed = [con for con in self.connections
if any(port in con for port in ports)]
for con in to_be_removed:
self.remove_element(con)
def remove_element(self, element):
"""
Remove the element from the list of elements.
If the element is a port, remove the whole block.
If the element is a block, remove its connections.
If the element is a connection, just remove the connection.
"""
if element is self._options_block:
return
if element.is_port:
element = element.parent_block # remove parent block
if element in self.blocks:
# Remove block, remove all involved connections
self.disconnect(*element.ports())
self.blocks.remove(element)
elif element in self.connections:
self.connections.remove(element)
##############################################
# Import/Export Methods
##############################################
def export_data(self):
"""
Export this flow graph to nested data.
Export all block and connection data.
Returns:
a nested data odict
"""
def block_order(b):
return not b.key.startswith('variable'), b.name # todo: vars still first ?!?
data = collections.OrderedDict()
data['options'] = self._options_block.export_data()
data['blocks'] = [b.export_data() for b in sorted(self.blocks, key=block_order)
if b is not self._options_block]
data['connections'] = sorted(c.export_data() for c in self.connections)
data['metadata'] = {'file_format': FLOW_GRAPH_FILE_FORMAT_VERSION}
return data
def _build_depending_hier_block(self, block_id):
# we're before the initial fg update(), so no evaluated values!
# --> use raw value instead
path_param = self._options_block.params['hier_block_src_path']
file_path = self.parent_platform.find_file_in_paths(
filename=block_id + '.grc',
paths=path_param.get_value(),
cwd=self.grc_file_path
)
if file_path: # grc file found. load and get block
self.parent_platform.load_and_generate_flow_graph(file_path, hier_only=True)
return self.new_block(block_id) # can be None
def import_data(self, data):
"""
Import blocks and connections into this flow graph.
Clear this flow graph of all previous blocks and connections.
Any blocks or connections in error will be ignored.
Args:
data: the nested data odict
"""
# Remove previous elements
del self.blocks[:]
self.connections.clear()
file_format = data['metadata']['file_format']
# build the blocks
self._options_block.import_data(name='', **data.get('options', {}))
self.blocks.append(self._options_block)
for block_data in data.get('blocks', []):
block_id = block_data['id']
block = (
self.new_block(block_id) or
self._build_depending_hier_block(block_id) or
self.new_block(block_id='_dummy', missing_block_id=block_id, **block_data)
)
if isinstance(block, blocks.DummyBlock):
print('Block id "%s" not found' % block_id)
block.import_data(**block_data)
self.rewrite() # evaluate stuff like nports before adding connections
# build the connections
def verify_and_get_port(key, block, dir):
ports = block.sinks if dir == 'sink' else block.sources
for port in ports:
if key == port.key or key + '0' == port.key:
break
if not key.isdigit() and port.dtype == '' and key == port.name:
break
else:
if block.is_dummy_block:
port = block.add_missing_port(key, dir)
else:
raise LookupError('%s key %r not in %s block keys' % (dir, key, dir))
return port
had_connect_errors = False
_blocks = {block.name: block for block in self.blocks}
try:
# TODO: Add better error handling if no connections exist in the flowgraph file.
for src_blk_id, src_port_id, snk_blk_id, snk_port_id in data.get('connections', []):
source_block = _blocks[src_blk_id]
sink_block = _blocks[snk_blk_id]
# fix old, numeric message ports keys
if file_format < 1:
src_port_id, snk_port_id = _update_old_message_port_keys(
src_port_id, snk_port_id, source_block, sink_block)
# build the connection
source_port = verify_and_get_port(src_port_id, source_block, 'source')
sink_port = verify_and_get_port(snk_port_id, sink_block, 'sink')
self.connect(source_port, sink_port)
except (KeyError, LookupError) as e:
Messages.send_error_load(
'Connection between {}({}) and {}({}) could not be made.\n\t{}'.format(
src_blk_id, src_port_id, snk_blk_id, snk_port_id, e))
had_connect_errors = True
self.rewrite() # global rewrite
return had_connect_errors
def _update_old_message_port_keys(source_key, sink_key, source_block, sink_block):
"""
Backward compatibility for message port keys
Message ports use their names as key (like in the 'connect' method).
Flowgraph files from former versions still have numeric keys stored for
message connections. These have to be replaced by the name of the
respective port. The correct message port is deduced from the integer
value of the key (assuming the order has not changed).
The connection ends are updated only if both ends translate into a
message port.
"""
try:
# get ports using the "old way" (assuming linear indexed keys)
source_port = source_block.sources[int(source_key)]
sink_port = sink_block.sinks[int(sink_key)]
if source_port.dtype == "message" and sink_port.dtype == "message":
source_key, sink_key = source_port.key, sink_port.key
except (ValueError, IndexError):
pass
return source_key, sink_key # do nothing