lnpeer: only set initialized after both sent AND received "init"

had a trace where we tried to send "funding_locked" before being initialized:

D | lnpeer.Peer.[iq7zhmhck54vcax2vlrdcavq2m32wao7ekh6jyeglmnuuvv3js57r4id.onion:9735] | Sending FUNDING_LOCKED
E | lnworker.LNWallet | Exception in on_update_open_channel: AttributeError("'LNTransport' object has no attribute 'sk'")
Traceback (most recent call last):
  File "...\electrum\electrum\util.py", line 999, in wrapper
    return await func(*args, **kwargs)
  File "...\electrum\electrum\lnworker.py", line 674, in on_update_open_channel
    peer.send_funding_locked(chan)
  File "...\electrum\electrum\lnpeer.py", line 876, in send_funding_locked
    self.send_message("funding_locked", channel_id=channel_id, next_per_commitment_point=per_commitment_point_second)
  File "...\electrum\electrum\lnpeer.py", line 102, in send_message
    self.transport.send_bytes(raw_msg)
  File "...\electrum\electrum\lntransport.py", line 93, in send_bytes
    lc = aead_encrypt(self.sk, self.sn(), b'', l)
AttributeError: 'LNTransport' object has no attribute 'sk'

electrum/lnpeer.py

@@ -65,6 +65,8 @@ def channel_id_from_funding_tx(funding_txid: str, funding_index: int) -> Tuple[b
 class Peer(Logger):
 
     def __init__(self, lnworker: Union['LNGossip', 'LNWallet'], pubkey:bytes, transport: LNTransportBase):
+        self._sent_init = False  # type: bool
+        self._received_init = False  # type: bool
         self.initialized = asyncio.Event()
         self.querying = asyncio.Event()
         self.transport = transport
@@ -97,6 +99,8 @@ class Peer(Logger):
     def send_message(self, message_name: str, **kwargs):
         assert type(message_name) is str
         self.logger.debug(f"Sending {message_name.upper()}")
+        if message_name.upper() != "INIT" and not self.initialized.is_set():
+            raise Exception("tried to send message before we are initialized")
         raw_msg = encode_msg(message_name, **kwargs)
         self._store_raw_msg_if_local_update(raw_msg, message_name=message_name, channel_id=kwargs.get("channel_id"))
         self.transport.send_bytes(raw_msg)
@@ -116,6 +120,7 @@ class Peer(Logger):
         if isinstance(self.transport, LNTransport):
             await self.transport.handshake()
         self.send_message("init", gflen=0, lflen=1, localfeatures=self.localfeatures)
+        self._sent_init = True
 
     @property
     def channels(self) -> Dict[bytes, Channel]:
@@ -176,7 +181,7 @@ class Peer(Logger):
         self.funding_created[channel_id].put_nowait(payload)
 
     def on_init(self, payload):
-        if self.initialized.is_set():
+        if self._received_init:
             self.logger.info("ALREADY INITIALIZED BUT RECEIVED INIT")
             return
         # if they required some even flag we don't have, they will close themselves
@@ -199,7 +204,9 @@ class Peer(Logger):
                     self.localfeatures |= 1 << get_ln_flag_pair_of_bit(flag)
         if isinstance(self.transport, LNTransport):
             self.channel_db.add_recent_peer(self.transport.peer_addr)
-        self.initialized.set()
+        self._received_init = True
+        if self._sent_init and self._received_init:
+            self.initialized.set()
 
     def on_node_announcement(self, payload):
         self.gossip_queue.put_nowait(('node_announcement', payload))
@@ -436,6 +443,8 @@ class Peer(Logger):
             await asyncio.wait_for(self.initialize(), LN_P2P_NETWORK_TIMEOUT)
         except (OSError, asyncio.TimeoutError, HandshakeFailed) as e:
             raise GracefulDisconnect(f'initialize failed: {repr(e)}') from e
+        if self._sent_init and self._received_init:
+            self.initialized.set()
         async for msg in self.transport.read_messages():
             self.process_message(msg)
             await asyncio.sleep(.01)

electrum/lnworker.py

@@ -670,7 +670,7 @@ class LNWallet(LNWorker):
 
         if chan.get_state() == channel_states.FUNDED:
             peer = self.peers.get(chan.node_id)
-            if peer:
+            if peer and peer.initialized.is_set():
                 peer.send_funding_locked(chan)
 
         elif chan.get_state() == channel_states.OPEN: