reintroduce 'unlock' command

- the unlock command was replaced by an option to load_wallet,
because some applications (the swapserver plugin) need to be
executed with an unlocked password. Now the swapserver plugin
waits until the wallet is unlocked.
- wallet.unlock now checks password unconditionally, see #8799

electrum/commands.py

@@ -246,16 +246,13 @@ class Commands:
         ]
 
     @command('n')
-    async def load_wallet(self, wallet_path=None, unlock=False, password=None):
+    async def load_wallet(self, wallet_path=None, password=None):
         """
         Load the wallet in memory
         """
         wallet = self.daemon.load_wallet(wallet_path, password, upgrade=True)
         if wallet is None:
             raise UserFacingException('could not load wallet')
-        if unlock:
-            # FIXME if this raises, load_wallet() above still succeeded...
-            wallet.unlock(password)
         run_hook('load_wallet', wallet, None)
 
     @command('n')
@@ -368,6 +365,11 @@ class Commands:
         sh = bitcoin.address_to_scripthash(address)
         return await self.network.get_history_for_scripthash(sh)
 
+    @command('wp')
+    async def unlock(self, wallet: Abstract_Wallet = None, password=None):
+        """Unlock the wallet (store the password in memory)."""
+        wallet.unlock(password)
+
     @command('w')
     async def listunspent(self, wallet: Abstract_Wallet = None):
         """List unspent outputs. Returns the list of unspent transaction
@@ -1470,7 +1472,6 @@ command_options = {
     'from_amount': (None, "Amount to convert (default: 1)"),
     'from_ccy':    (None, "Currency to convert from"),
     'to_ccy':      (None, "Currency to convert to"),
-    'unlock':      (None, "Unlock the wallet (store the password in memory)."),
     'public':      (None, 'Channel will be announced'),
 }
 

electrum/plugins/swapserver/server.py

@@ -38,6 +38,11 @@ class SwapServer(Logger, EventListener):
     @ignore_exceptions
     @log_exceptions
     async def run(self):
+
+        while self.wallet.has_password() and self.wallet.get_unlocked_password() is None:
+            self.logger.info("This wallet is password-protected. Please unlock it to start the swapserver plugin")
+            await asyncio.sleep(10)
+
         app = web.Application()
         app.add_routes([web.get('/getpairs', self.get_pairs)])
         app.add_routes([web.post('/createswap', self.create_swap)])

electrum/wallet.py

@@ -3274,7 +3274,6 @@ class Abstract_Wallet(ABC, Logger, EventListener):
 
     def unlock(self, password):
         self.logger.info(f'unlocking wallet')
-        if self.has_password():
         self.check_password(password)
         self._password_in_memory = password