protocol.py: add warn_trustlevel(), create altcoin classes from init_proto()

mmgen/altcoin.py

@@ -731,12 +731,8 @@ def init_genonly_altcoins(usr_coin=None,testnet=False):
 		if cinfo.trust_level == -1:
 			raise ValueError(f'{usr_coin.upper()!r}: unsupported (disabled) coin for network {network.upper()}')
 
-		trust_level = cinfo.trust_level
-
 	create_altcoin_protos(data)
 
-	return trust_level
-
 def create_altcoin_protos(data):
 
 	from .protocol import CoinProtocol

mmgen/opts.py

@@ -374,12 +374,6 @@ def init(
 		g.regtest = True
 		g.data_dir = os.path.join(g.data_dir_root,'regtest',g.coin.lower(),('alice','bob')[g.bob])
 
-	if need_proto:
-		from .altcoin import init_genonly_altcoins
-		altcoin_trust_level = init_genonly_altcoins(
-			g.coin,
-			testnet = g.testnet or g.regtest )
-
 	# === end global var initialization === #
 
 	# print help screen only after global vars are initialized:
@@ -391,8 +385,8 @@ def init(
 	del mmgen.share.Opts.parse_opts
 
 	if need_proto:
-		from .util import warn_altcoins
-		warn_altcoins(g.coin,altcoin_trust_level)
+		from .protocol import warn_trustlevel
+		warn_trustlevel(g.coin)
 
 	die_on_incompatible_opts(g.incompatible_opts)
 
@@ -601,10 +595,6 @@ def check_usr_opts(usr_opts): # Raises an exception if any check fails
 		from .util import ymsg
 		ymsg(f'Adjusting transaction vsize by a factor of {float(val):1.2f}')
 
-	def chk_coin(key,val,desc):
-		from .protocol import CoinProtocol
-		opt_is_in_list(val.lower(),CoinProtocol.coins,'coin')
-
 # TODO: move this check elsewhere
 #	def chk_rbf(key,val,desc):
 #		if not proto.cap('rbf'):

mmgen/protocol.py

@@ -551,11 +551,10 @@ def init_proto(coin=None,testnet=False,regtest=False,network=None,network_id=Non
 		network = 'regtest' if regtest else 'testnet' if testnet else 'mainnet'
 
 	coin = coin.lower()
+
 	if coin not in CoinProtocol.coins:
-		raise ValueError(
-			f'{coin.upper()}: not a valid coin for network {network.upper()}\n'
-			+ 'Supported coins: '
-			+ ' '.join(c.upper() for c in CoinProtocol.coins) )
+		from .altcoin import init_genonly_altcoins
+		init_genonly_altcoins( coin, testnet=testnet ) # raises exception on failure
 
 	name = CoinProtocol.coins[coin].name
 	proto_name = name + ('' if network == 'mainnet' else network.capitalize())
@@ -572,3 +571,45 @@ def init_proto_from_opts():
 		testnet   = g.testnet,
 		regtest   = g.regtest,
 		tokensym  = g.token )
+
+def warn_trustlevel(coinsym):
+
+	if coinsym.lower() in CoinProtocol.coins:
+		trust_level = CoinProtocol.coins[coinsym.lower()].trust_level
+	else:
+		from .altcoin import CoinInfo
+		e = CoinInfo.get_entry(coinsym,'mainnet')
+		trust_level = e.trust_level if e else None
+		if trust_level in (None,-1):
+			from .util import die
+			die(1,f'Coin {coinsym} is not supported by {g.proj_name}')
+
+	if trust_level > 3:
+		return
+
+	m = """
+		Support for coin {c!r} is EXPERIMENTAL.  The {p} project
+		assumes no responsibility for any loss of funds you may incur.
+		This coin’s {p} testing status: {t}
+		Are you sure you want to continue?
+	"""
+
+	from .util import qmsg,fmt,keypress_confirm
+	from .color import red,yellow,green
+
+	warning = fmt(m).strip().format(
+		c = coinsym.upper(),
+		t = {
+			0: red('COMPLETELY UNTESTED'),
+			1: red('LOW'),
+			2: yellow('MEDIUM'),
+			3: green('OK'),
+		}[trust_level],
+		p = g.proj_name )
+
+	if g.test_suite:
+		qmsg(warning)
+		return
+
+	if not keypress_confirm(warning,default_yes=True):
+		sys.exit(0)

mmgen/tool/api.py

@@ -80,11 +80,8 @@ class tool_api(
 		Valid choices for coins: one of the symbols returned by the 'coins' attribute
 		Valid choices for network: 'mainnet','testnet','regtest'
 		"""
-		from ..protocol import init_proto
-		from ..altcoin import init_genonly_altcoins
-		from ..util import warn_altcoins
-		altcoin_trust_level = init_genonly_altcoins(coinsym,testnet=network in ('testnet','regtest'))
-		warn_altcoins(coinsym,altcoin_trust_level)
+		from ..protocol import init_proto,warn_trustlevel
+		warn_trustlevel(coinsym)
 		self.proto = init_proto(coinsym,network=network)
 		return self.proto
 

mmgen/util.py

@@ -207,32 +207,6 @@ def exit_if_mswin(feature):
 		m = capfirst(feature) + ' not supported on the MSWin / MSYS2 platform'
 		ydie(1,m)
 
-def warn_altcoins(coinsym,trust_level):
-	if trust_level > 3:
-		return
-
-	tl_str = (
-		red('COMPLETELY UNTESTED'),
-		red('LOW'),
-		yellow('MEDIUM'),
-		green('HIGH'),
-	)[trust_level]
-
-	m = """
-		Support for coin {!r} is EXPERIMENTAL.  The {pn} project
-		assumes no responsibility for any loss of funds you may incur.
-		This coin’s {pn} testing status: {}
-		Are you sure you want to continue?
-	"""
-	m = fmt(m).strip().format(coinsym.upper(),tl_str,pn=g.proj_name)
-
-	if g.test_suite:
-		qmsg(m)
-		return
-
-	if not keypress_confirm(m,default_yes=True):
-		sys.exit(0)
-
 def get_keccak():
 
 	from .opts import opt