proto.btc.rpc: allow multiple loaded coin daemon wallets

As of this commit, non-MMGen coin daemon wallets may remain loaded when using
MMGen, and they’ll be safely ignored.

As before, the MMGen tracking wallet will be created automatically if it doesn’t
exist.

Use of the default wallet as tracking wallet is no longer supported.  In the
unlikely event you’re still using your coin daemon’s default `wallet.dat` as
your MMGen tracking wallet, you must perform the following steps before running
any MMGen command:

1) Stop the coin daemon.

2) Execute `mkdir -p /path-to-coind-datadir/wallets/mmgen-tracking-wallet`.

3) Move the default `wallet.dat` to the newly created directory.

mmgen/data/version

@@ -1 +1 @@
-14.0.dev0
+14.0.dev1

mmgen/proto/btc/rpc.py

@@ -184,8 +184,11 @@ async def check_chainfork_mismatch(block0):
 			await self.check_or_create_daemon_wallet()
 
 		# for regtest, wallet path must remain '/' until Carol’s user wallet has been created
-		if cfg.regtest_user:
-			self.wallet_path = f'/wallet/{cfg.regtest_user}'
+		if self.chain == 'regtest':
+			if cfg.regtest_user:
+				self.wallet_path = f'/wallet/{cfg.regtest_user}'
+		else:
+			self.wallet_path = f'/wallet/{self.twname}'
 
 	def set_auth(self):
 		"""
@@ -223,53 +226,21 @@ async def tracking_wallet_exists(self):
 		wnames = [i['name'] for i in (await self.call('listwalletdir'))['wallets']]
 		return twname in wnames
 
-	async def check_or_create_daemon_wallet(self,called=[],wallet_create=True):
-		"""
-		Returns True if the correct tracking wallet is currently loaded or if a new one
-		is created, False otherwise
-		"""
+	async def check_or_create_daemon_wallet(self):
 
-		if called or (self.chain == 'regtest' and self.cfg.regtest_user != 'carol'):
-			return False
+		if self.chain == 'regtest' and self.cfg.regtest_user != 'carol':
+			return
 
-		twname = self.twname
+		twname = self.cfg.regtest_user or self.twname
 		loaded_wnames = await self.call('listwallets')
-		wnames = [i['name'] for i in (await self.call('listwalletdir'))['wallets']]
-		m = f'Please fix your {self.daemon.desc} wallet installation or cmdline options'
-		ret = False
-
-		if self.cfg.carol:
-			if 'carol' in loaded_wnames:
-				ret = True
-			elif wallet_create:
-				await self.icall('createwallet',wallet_name='carol')
-				ymsg(f'Created {self.daemon.coind_name} wallet {"carol"!r}')
-				ret = True
-		elif len(loaded_wnames) == 1:
-			loaded_wname = loaded_wnames[0]
-			if twname in wnames and loaded_wname != twname:
-				await self.call('unloadwallet',loaded_wname)
-				await self.call('loadwallet',twname)
-			elif loaded_wname == '':
-				ymsg(f'WARNING: use of default wallet as tracking wallet is not recommended!\n{m}')
-			elif loaded_wname != twname:
-				ymsg(f'WARNING: loaded wallet {loaded_wname!r} is not {twname!r}\n{m}')
-			ret = True
-		elif len(loaded_wnames) == 0:
+
+		if twname not in loaded_wnames:
+			wnames = [i['name'] for i in (await self.call('listwalletdir'))['wallets']]
 			if twname in wnames:
 				await self.call('loadwallet',twname)
-				ret = True
-			elif wallet_create:
+			else:
 				await self.icall('createwallet',wallet_name=twname)
 				ymsg(f'Created {self.daemon.coind_name} wallet {twname!r}')
-				ret = True
-		else: # support only one loaded wallet for now
-			die(4,f'ERROR: more than one {self.daemon.coind_name} wallet loaded: {loaded_wnames}')
-
-		if wallet_create:
-			called.append(True)
-
-		return ret
 
 	def get_daemon_cfg_fn(self):
 		# Use dirname() to remove 'bob' or 'alice' component

mmgen/proto/btc/tw/json.py

@@ -53,7 +53,11 @@ async def tracking_wallet_exists(self):
 			return await self.twctl.rpc.tracking_wallet_exists
 
 		async def create_tracking_wallet(self):
-			return await self.twctl.rpc.check_or_create_daemon_wallet(wallet_create=True)
+			try:
+				await self.twctl.rpc.check_or_create_daemon_wallet()
+				return True
+			except:
+				return False
 
 		async def get_entries(self):
 			entries_in = [self.entry_tuple_in(*e) for e in self.data['data']['entries']]