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import dbus
import uuid
import twisted.protocols.sip
from servicetest import (
make_channel_proxy,
assertContains,
)
class VoipTestContext(object):
# Default audio codecs for the remote end
audio_codecs = [ ('GSM', 3, 8000, {}),
('PCMA', 8, 8000, {}),
('PCMU', 0, 8000, {}) ]
# Default video codecs for the remote end. I have no idea what's
# a suitable value here...
video_codecs = [ ('WTF', 42, 80000, {}) ]
# Default candidates for the remote end
remote_transports = [
( "192.168.0.1", # host
666, # port
0, # protocol = TP_MEDIA_STREAM_BASE_PROTO_UDP
"RTP", # protocol subtype
"AVP", # profile
1.0, # preference
0, # transport type = TP_MEDIA_STREAM_TRANSPORT_TYPE_LOCAL,
"username",
"password" ) ]
_mline_template = 'm=audio %(port)s %(subtype)s/%(profile)s %(codec_ids)s'
_aline_template = 'a=rtpmap:%(codec_id)s %(name)s/%(rate)s'
def __init__(self, q, conn, bus, sip_proxy, our_uri, peer):
self.bus = bus
self.conn = conn
self.q = q
self.our_uri = our_uri
self.peer = peer
self.peer_id = "sip:" + peer
self.sip_proxy = sip_proxy
self._cseq_id = 1
def dbusify_codecs(self, codecs):
dbussed_codecs = [ (id, name, 0, rate, 0, params )
for (name, id, rate, params) in codecs ]
return dbus.Array(dbussed_codecs, signature='(usuuua{ss})')
def dbusify_codecs_with_params (self, codecs):
return self.dbusify_codecs(codecs)
def get_audio_codecs_dbus(self):
return self.dbusify_codecs(self.audio_codecs)
def get_video_codecs_dbus(self):
return self.dbusify_codecs(self.video_codecs)
def dbusify_call_codecs(self, codecs):
dbussed_codecs = [ (id, name, rate, 0, params)
for (name, id, rate, params) in codecs ]
return dbus.Array(dbussed_codecs, signature='(usuua{ss})')
def dbusify_call_codecs_with_params(self, codecs):
return dbusify_call_codecs (self, codecs)
def get_call_audio_codecs_dbus(self):
return self.dbusify_call_codecs(self.audio_codecs)
def get_call_video_codecs_dbus(self):
return self.dbusify_call_codecs(self.video_codecs)
def get_remote_transports_dbus(self):
return dbus.Array([
(dbus.UInt32(1 + i), host, port, proto, subtype,
profile, pref, transtype, user, pwd)
for i, (host, port, proto, subtype, profile,
pref, transtype, user, pwd)
in enumerate(self.remote_transports) ],
signature='(usuussduss)')
def get_call_remote_transports_dbus(self):
return dbus.Array([
(1 , host, port,
{ "Type": transtype,
"Foundation": "",
"Protocol": proto,
"Priority": int((1+i) * 65536),
"Username": user,
"Password": pwd }
) for i, (host, port, proto, subtype, profile,
pref, transtype, user, pwd)
in enumerate(self.remote_transports) ],
signature='(usqa{sv})')
def get_call_sdp(self):
(ip, port, protocol, subtype, profile, preference,
transport, username, password) = self.remote_transports[0]
codec_id_list = []
codec_list = []
for name, codec_id, rate, _misc in self.audio_codecs:
codec_list.append('a=rtpmap:%(codec_id)s %(name)s/%(rate)s' % locals())
codec_id_list.append(str(codec_id))
codec_ids = ' '.join(codec_id_list)
codecs = '\r\n'.join(codec_list)
sdp_string = ('v=0\r\n'
'o=- 7047265765596858314 2813734028456100815 IN IP4 %(ip)s\r\n'
's=-\r\n'
't=0 0\r\n'
'm=audio %(port)s RTP/AVP 3 8 0\r\n'
'c=IN IP4 %(ip)s\r\n'
'%(codecs)s\r\n') % locals()
return sdp_string
def check_call_sdp(self, sdp_string):
codec_id_list = []
for name, codec_id, rate, _misc in self.audio_codecs:
assertContains (self._aline_template % locals(), sdp_string)
codec_id_list.append(str(codec_id))
codec_ids = ' '.join(codec_id_list)
(ip, port, protocol, subtype, profile, preference,
transport, username, password) = self.remote_transports[0]
assert self._mline_template % locals() in sdp_string
def send_message(self, message_type, body='', to_=None, from_=None,
**additional_headers):
url = twisted.protocols.sip.parseURL('sip:testacc@127.0.0.1')
msg = twisted.protocols.sip.Request(message_type, url)
if body:
msg.body = body
msg.addHeader('content-length', '%d' % len(msg.body))
msg.addHeader('from', from_ or '<%s>;tag=XYZ' % self.peer_id)
msg.addHeader('to', to_ or '<sip:testacc@127.0.0.1>')
self._cseq_id += 1
additional_headers.setdefault('cseq', '%d %s' % (self._cseq_id, message_type))
for key, vals in additional_headers.items():
if not isinstance(vals, list):
vals = [vals]
k = key.replace('_', '-')
for v in vals:
msg.addHeader(k, v)
via = self.sip_proxy.getVia()
via.branch = 'z9hG4bKXYZ'
msg.addHeader('via', via.toString())
_expire, destination = self.sip_proxy.registry.users['testacc']
self.sip_proxy.sendMessage(destination, msg)
return msg
def accept(self, invite_message):
self.call_id = invite_message.headers['call-id'][0]
response = self.sip_proxy.responseFromRequest(200, invite_message)
# Echo rakia's SDP back to it. It doesn't care.
response.addHeader('content-type', 'application/sdp')
response.body = invite_message.body
response.addHeader('content-length', '%d' % len(response.body))
self.sip_proxy.deliverResponse(response)
return response
def ack(self, ok_message):
cseq = '%s ACK' % ok_message.headers['cseq'][0].split()[0]
self.send_message('ACK', call_id=self.call_id, cseq=cseq)
def incoming_call(self):
self.call_id = uuid.uuid4().hex
body = self.get_call_sdp()
return self.send_message('INVITE', body, content_type='application/sdp',
supported='timer, 100rel', call_id=self.call_id)
def incoming_call_from_self(self):
self.call_id = uuid.uuid4().hex
body = self.get_call_sdp()
return self.send_message('INVITE', body, content_type='application/sdp',
supported='timer, 100rel', call_id=self.call_id,
from_='<sip:testacc@127.0.0.1>')
def terminate(self):
return self.send_message('BYE', call_id=self.call_id)
def handle_audio_session(self, chan):
"""
Serves a SessionHandler and a StreamHandler for the MediaSignalling
channel. Returns the interface proxy for StreamHandler.
"""
session_handlers = chan.MediaSignalling.GetSessionHandlers()
sh_path, sh_type = session_handlers[0]
assert sh_type == 'rtp'
session_handler = make_channel_proxy(self.conn, sh_path,
'Media.SessionHandler')
session_handler.Ready()
e = self.q.expect('dbus-signal', signal='NewStreamHandler')
stream_handler = make_channel_proxy(self.conn, e.args[0],
'Media.StreamHandler')
stream_handler.NewNativeCandidate("fake", self.get_remote_transports_dbus())
stream_handler.NativeCandidatesPrepared()
stream_handler.Ready(self.get_audio_codecs_dbus())
return stream_handler
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