connection_count.py

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#!/usr/bin/env python
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import unittest
import rosunit
import sys
import time
import subprocess

class ConnectionCount(unittest.TestCase):

  def test_connection_count(self):
    # Wait while the recorder creates a bag for us to examine
    time.sleep(10.0)

    # Check the connection count returned by `rosbag info`
    # We could probably do this through the rosbag Python API...
    cmd = ['rosbag', 'info', 
           '/tmp/test_rosbag_record_two_publishers.bag',
           '-y', '-k', 'topics']
    p = subprocess.Popen(cmd, stdout=subprocess.PIPE, stderr=subprocess.PIPE)
    out,err = p.communicate()
    self.assertEqual(p.returncode, 0, 'Failed to check bag\ncmd=%s\nstdout=%s\nstderr=%s'%(cmd,out,err))

    conns = False
    for l in out.decode().split('\n'):
        f = l.strip().split(': ')
        if len(f) == 2 and f[0] == 'connections':
            conns = int(f[1])
            break

    self.assertEqual(conns, 2)

if __name__ == '__main__':
  rosunit.unitrun('test_rosbag', 'connection_count', ConnectionCount, sys.argv)