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transcribe: refactor in anticipation of EventSource client

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This commit is contained in:
Brian Warner 2015-03-12 23:03:57 -07:00
parent 8741d5adaa
commit a8b6cad827
1 changed files with 21 additions and 10 deletions
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31
src/wormhole/blocking/transcribe.py
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@ -48,9 +48,20 @@ class Common:
def url(self, suffix):
return "%s%d/%s/%s" % (self.relay, self.channel_id, self.side, suffix)
def poll(self, msgs, url_suffix):
def get(self, old_msgs, url_suffix):
# For now, server errors cause the client to fail. TODO: don't. This
# will require changing the client to re-post messages when the
# server comes back up.
# note: while this passes around msgs (plural), our callers really
# only care about the first one. we use "WHICH" and "SIDE" so that we
# only expect to see a single message (not our own, where "SIDE" is
# our own, and not messages for earlier stages, where "WHICH" is
# different)
msgs = old_msgs
while not msgs:
if time.time() > (self.started + self.timeout):
remaining = self.started + self.timeout - time.time()
if remaining < 0:
raise Timeout
time.sleep(self.wait)
r = requests.post(self.url(url_suffix))
@ -72,8 +83,8 @@ class Common:
other_msgs = r.json()["messages"]
return other_msgs
def _poll_pake(self, other_msgs):
msgs = self.poll(other_msgs, "pake/poll")
def _get_pake(self, other_msgs):
msgs = self.get(other_msgs, "pake/poll")
pake_msg = unhexlify(msgs[0].encode("ascii"))
key = self.sp.finish(pake_msg)
return key
@ -91,8 +102,8 @@ class Common:
other_msgs = r.json()["messages"]
return other_msgs
def _poll_data(self, other_msgs):
msgs = self.poll(other_msgs, "data/poll")
def _get_data(self, other_msgs):
msgs = self.get(other_msgs, "data/poll")
data = unhexlify(msgs[0].encode("ascii"))
return data
@ -131,14 +142,14 @@ class Initiator(Common):
return self.code
def get_data(self):
key = self._poll_pake([])
key = self._get_pake([])
self.key = key
try:
outbound_key = self.derive_key(b"sender")
outbound_encrypted = self._encrypt_data(outbound_key, self.data)
other_msgs = self._post_data(outbound_encrypted)
inbound_encrypted = self._poll_data(other_msgs)
inbound_encrypted = self._get_data(other_msgs)
inbound_key = self.derive_key(b"receiver")
try:
inbound_data = self._decrypt_data(inbound_key,
@ -187,7 +198,7 @@ class Receiver(Common):
assert self.code is not None
assert self.channel_id is not None
other_msgs = self._post_pake()
key = self._poll_pake(other_msgs)
key = self._get_pake(other_msgs)
self.key = key
try:
@ -195,7 +206,7 @@ class Receiver(Common):
outbound_encrypted = self._encrypt_data(outbound_key, self.data)
other_msgs = self._post_data(outbound_encrypted)
inbound_encrypted = self._poll_data(other_msgs)
inbound_encrypted = self._get_data(other_msgs)
inbound_key = self.derive_key(b"sender")
try:
inbound_data = self._decrypt_data(inbound_key,