From 5ab960295f00991fa9447819b3ff9eaf8d88d28e Mon Sep 17 00:00:00 2001
From: Roy Thompson <rthompso@gmail.com>
Date: Thu, 31 Jan 2013 13:16:12 -0700
Subject: core: Enabling msg_connect within python blocks.
---
gnuradio-core/src/python/gnuradio/gr/gateway.py | 28 +++++
.../gnuradio/gr/qa_python_message_passing.py | 123 +++++++++++++++++++++
2 files changed, 151 insertions(+)
create mode 100644 gnuradio-core/src/python/gnuradio/gr/qa_python_message_passing.py
(limited to 'gnuradio-core/src/python')
diff --git a/gnuradio-core/src/python/gnuradio/gr/gateway.py b/gnuradio-core/src/python/gnuradio/gr/gateway.py
index 244b8b5925..c25755bb57 100644
--- a/gnuradio-core/src/python/gnuradio/gr/gateway.py
+++ b/gnuradio-core/src/python/gnuradio/gr/gateway.py
@@ -59,6 +59,24 @@ class gateway_handler(gr_core.feval_ll):
raise ex
return 0
+########################################################################
+# Handler that does callbacks from C++
+########################################################################
+class msg_handler(gr_core.feval_p):
+
+ #dont put a constructor, it wont work
+
+ def init(self, callback):
+ self._callback = callback
+
+ def eval(self, arg):
+ try: self._callback(arg)
+ except Exception as ex:
+ print("handler caught exception: %s"%ex)
+ import traceback; traceback.print_exc()
+ raise ex
+ return 0
+
########################################################################
# The guts that make this into a gr block
########################################################################
@@ -91,6 +109,9 @@ class gateway_block(object):
self.__handler, name, gr_in_sig, gr_out_sig, work_type, factor)
self.__message = self.__gateway.gr_block_message()
+ #dict to keep references to all message handlers
+ self.__msg_handlers = {}
+
#register gr_block functions
prefix = 'gr_block__'
for attr in [x for x in dir(self.__gateway) if x.startswith(prefix)]:
@@ -171,6 +192,13 @@ class gateway_block(object):
def start(self): return True
def stop(self): return True
+ def set_msg_handler(self, which_port, handler_func):
+ handler = msg_handler()
+ handler.init(handler_func)
+ self.__gateway.set_msg_handler_feval(which_port, handler)
+ # Save handler object in class so it's not garbage collected
+ self.__msg_handlers[which_port] = handler
+
########################################################################
# Wrappers for the user to inherit from
########################################################################
diff --git a/gnuradio-core/src/python/gnuradio/gr/qa_python_message_passing.py b/gnuradio-core/src/python/gnuradio/gr/qa_python_message_passing.py
new file mode 100644
index 0000000000..06bb96947b
--- /dev/null
+++ b/gnuradio-core/src/python/gnuradio/gr/qa_python_message_passing.py
@@ -0,0 +1,123 @@
+#!/usr/bin/env python
+#
+# Copyright 2013 Free Software Foundation, Inc.
+#
+# This file is part of GNU Radio
+#
+# GNU Radio 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 3, or (at your option)
+# any later version.
+#
+# GNU Radio 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 GNU Radio; see the file COPYING. If not, write to
+# the Free Software Foundation, Inc., 51 Franklin Street,
+# Boston, MA 02110-1301, USA.
+#
+
+from gnuradio import gr, gr_unittest
+try: import pmt
+except: from gruel import pmt
+import numpy
+import time
+
+# Simple block to generate messages
+class message_generator(gr.sync_block):
+ def __init__(self, msg_list, msg_interval):
+ gr.sync_block.__init__(
+ self,
+ name = "message generator",
+ in_sig = [numpy.float32],
+ out_sig = None
+ )
+ self.msg_list = msg_list
+ self.msg_interval = msg_interval
+ self.msg_ctr = 0
+ self.message_port_register_out(pmt.pmt_intern('out_port'))
+
+
+ def work(self, input_items, output_items):
+ inLen = len(input_items[0])
+ while self.msg_ctr < len(self.msg_list) and \
+ (self.msg_ctr * self.msg_interval) < \
+ (self.nitems_read(0) + inLen):
+ self.message_port_pub(pmt.pmt_intern('out_port'),
+ self.msg_list[self.msg_ctr])
+ self.msg_ctr += 1
+ return inLen
+
+# Simple block to consume messages
+class message_consumer(gr.sync_block):
+ def __init__(self):
+ gr.sync_block.__init__(
+ self,
+ name = "message consumer",
+ in_sig = None,
+ out_sig = None
+ )
+ self.msg_list = []
+ self.message_port_register_in(pmt.pmt_intern('in_port'))
+ self.set_msg_handler(pmt.pmt_intern('in_port'),
+ self.handle_msg)
+
+ def handle_msg(self, msg):
+ # Create a new PMT from long value and put in list
+ self.msg_list.append(pmt.pmt_from_long(pmt.pmt_to_long(msg)))
+
+class test_python_message_passing(gr_unittest.TestCase):
+
+ def setUp(self):
+ self.tb = gr.top_block()
+
+ def tearDown(self):
+ self.tb = None
+
+ def test_000(self):
+ num_msgs = 10
+ msg_interval = 1000
+ msg_list = []
+ for i in range(num_msgs):
+ msg_list.append(pmt.pmt_from_long(i))
+
+ # Create vector source with dummy data to trigger messages
+ src_data = []
+ for i in range(num_msgs*msg_interval):
+ src_data.append(float(i))
+ src = gr.vector_source_f(src_data, False)
+ msg_gen = message_generator(msg_list, msg_interval)
+ msg_cons = message_consumer()
+
+ # Connect vector source to message gen
+ self.tb.connect(src, msg_gen)
+
+ # Connect message generator to message consumer
+ self.tb.msg_connect(msg_gen, 'out_port', msg_cons, 'in_port')
+
+ # Verify that the messgae port query functions work
+ self.assertEqual(pmt.pmt_symbol_to_string(pmt.pmt_vector_ref(
+ msg_gen.message_ports_out(), 0)), 'out_port')
+ self.assertEqual(pmt.pmt_symbol_to_string(pmt.pmt_vector_ref(
+ msg_cons.message_ports_in(), 0)), 'in_port')
+
+ # Run to verify message passing
+ self.tb.start()
+
+ # Wait for all messages to be sent
+ while msg_gen.msg_ctr < num_msgs:
+ time.sleep(0.5)
+ self.tb.stop()
+ self.tb.wait()
+
+ # Verify that the message consumer got all the messages
+ self.assertEqual(num_msgs, len(msg_cons.msg_list))
+ for i in range(num_msgs):
+ self.assertTrue(pmt.pmt_equal(msg_list[i], msg_cons.msg_list[i]))
+
+if __name__ == '__main__':
+ gr_unittest.run(test_python_message_passing,
+ 'test_python_message_passing.xml')
--
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