feat(cli): Add feature flag and CLI parameters for Nano Contracts

Author: msbrogli

hathor/builder/cli_builder.py

@@ -103,6 +103,11 @@ def create_manager(self, reactor: Reactor) -> HathorManager:
             reactor_type=type(reactor).__name__,
         )
 
+        if not self._args.nano_testnet:
+            # Add protection to prevent enabling Nano Contracts due to misconfigurations.
+            self.check_or_raise(not settings.ENABLE_NANO_CONTRACTS,
+                                'configuration error: NanoContracts can only be enabled on localnets for now')
+
         tx_storage: TransactionStorage
         event_storage: EventStorage
         indexes: IndexesManager

hathor/cli/run_node.py

@@ -52,6 +52,7 @@ def create_parser(cls) -> ArgumentParser:
         parser.add_argument('--auto-hostname', action='store_true', help='Try to discover the hostname automatically')
         parser.add_argument('--unsafe-mode',
                             help='Enable unsafe parameters. **NEVER USE IT IN PRODUCTION ENVIRONMENT**')
+        parser.add_argument('--nano-testnet', action='store_true', help='Connect to Hathor nano-testnet')
         parser.add_argument('--testnet', action='store_true', help='Connect to Hathor testnet')
         parser.add_argument('--test-mode-tx-weight', action='store_true',
                             help='Reduces tx weight to 1 for testing purposes')
@@ -359,7 +360,7 @@ def check_python_version(self) -> None:
 
     def __init__(self, *, argv=None):
         from hathor.cli.run_node_args import RunNodeArgs
-        from hathor.conf import TESTNET_SETTINGS_FILEPATH
+        from hathor.conf import NANO_TESTNET_SETTINGS_FILEPATH, TESTNET_SETTINGS_FILEPATH
         from hathor.conf.get_settings import get_global_settings
         self.log = logger.new()
 
@@ -376,6 +377,8 @@ def __init__(self, *, argv=None):
             os.environ['HATHOR_CONFIG_YAML'] = self._args.config_yaml
         elif self._args.testnet:
             os.environ['HATHOR_CONFIG_YAML'] = TESTNET_SETTINGS_FILEPATH
+        elif self._args.nano_testnet:
+            os.environ['HATHOR_CONFIG_YAML'] = NANO_TESTNET_SETTINGS_FILEPATH
 
         try:
             get_global_settings()

hathor/conf/__init__.py

@@ -20,11 +20,13 @@
 
 MAINNET_SETTINGS_FILEPATH = str(parent_dir / 'mainnet.yml')
 TESTNET_SETTINGS_FILEPATH = str(parent_dir / 'testnet.yml')
+NANO_TESTNET_SETTINGS_FILEPATH = str(parent_dir / 'nano_testnet.yml')
 UNITTESTS_SETTINGS_FILEPATH = str(parent_dir / 'unittests.yml')
 
 __all__ = [
     'MAINNET_SETTINGS_FILEPATH',
     'TESTNET_SETTINGS_FILEPATH',
+    'NANO_TESTNET_SETTINGS_FILEPATH',
     'UNITTESTS_SETTINGS_FILEPATH',
     'HathorSettings',
 ]

hathor/conf/nano_testnet.yml

@@ -0,0 +1,22 @@
+P2PKH_VERSION_BYTE: x49
+MULTISIG_VERSION_BYTE: x87
+NETWORK_NAME: nano-testnet-alpha
+BOOTSTRAP_DNS: []
+
+# Genesis stuff
+GENESIS_OUTPUT_SCRIPT: 76a914a584cf48b161e4a49223ed220df30037ab740e0088ac
+GENESIS_BLOCK_TIMESTAMP: 1677601898
+GENESIS_BLOCK_NONCE: 717217
+GENESIS_BLOCK_HASH: 000006417e5ad864ce7e7c97090f6794e86058f99b7baf2b65acda21159dfa12
+GENESIS_TX1_NONCE: 190
+GENESIS_TX1_HASH: 00e161a6b0bee1781ea9300680913fb76fd0fac4acab527cd9626cc1514abdc9
+GENESIS_TX2_NONCE: 115
+GENESIS_TX2_HASH: 00975897028ceb037307327c953f5e7ad4d3f42402d71bd3d11ecb63ac39f01a
+
+# tx weight parameters. With these settings tx weight is always 8
+MIN_TX_WEIGHT_K: 0
+MIN_TX_WEIGHT_COEFFICIENT: 0
+MIN_TX_WEIGHT: 8
+CHECKPOINTS:
+ENABLE_NANO_CONTRACTS: true
+BLUEPRINTS:

hathor/conf/settings.py

@@ -423,6 +423,15 @@ def GENESIS_TX2_TIMESTAMP(self) -> int:
     OLD_MAX_MERKLE_PATH_LENGTH: int = 12
     NEW_MAX_MERKLE_PATH_LENGTH: int = 20
 
+    # Used to enable nano contracts.
+    #
+    # This should NEVER be enabled for mainnet and testnet, since both networks will
+    # activate Nano Contracts through the Feature Activation.
+    ENABLE_NANO_CONTRACTS: bool = False
+
+    # List of enabled blueprints.
+    BLUEPRINTS: list['str'] = []
+
     @classmethod
     def from_yaml(cls, *, filepath: str) -> 'HathorSettings':
         """Takes a filepath to a yaml file and returns a validated HathorSettings instance."""

hathor/conf/unittests.py

@@ -39,5 +39,6 @@
         evaluation_interval=4,
         max_signal_bits=4,
         default_threshold=3
-    )
+    ),
+    ENABLE_NANO_CONTRACTS=True,
 )