Rialto to Millau Transfer Generator (#568)

* Add option to relay for sending transfers to Millau chain

* Endow derived accounts on Millau chain

* Update message generator entrypoint script to send transfers

* Use correct command when sending messages

* Send Root messages from Root origin on source chain

* Wrap calls from Root Origin in Sudo Call

* Allow Root to send messages without paying fees

* Use correct variable when sending messages to Rialto

* Print warning if no message type is provided to script.

* Add note mentioning that certain source origins aren't supported yet

* Use correct runtime when initializing header sync

* Remove option to send messages as Root

* Remove endowment of derived Root accounts

* Fix indentation.

Co-authored-by: Tomasz Drwięga <tomasz@parity.io>

bridges/bin/millau/node/src/chain_spec.rs

@@ -14,6 +14,7 @@
 // You should have received a copy of the GNU General Public License
 // along with Parity Bridges Common.  If not, see <http://www.gnu.org/licenses/>.
 
+use bp_millau::derive_account_from_rialto_id;
 use millau_runtime::{
 	AccountId, AuraConfig, BalancesConfig, BridgeRialtoConfig, GenesisConfig, GrandpaConfig, SessionConfig,
 	SessionKeys, Signature, SudoConfig, SystemConfig, WASM_BINARY,
@@ -121,6 +122,9 @@ impl Alternative {
 							get_account_id_from_seed::<sr25519::Public>("Ferdie//stash"),
 							get_account_id_from_seed::<sr25519::Public>("George//stash"),
 							get_account_id_from_seed::<sr25519::Public>("Harry//stash"),
+							derive_account_from_rialto_id(bp_runtime::SourceAccount::Account(
+								get_account_id_from_seed::<sr25519::Public>("Dave"),
+							)),
 						],
 						true,
 					)
@@ -173,3 +177,13 @@ fn testnet_genesis(
 		}),
 	}
 }
+
+#[test]
+fn derived_dave_account_is_as_expected() {
+	let dave = get_account_id_from_seed::<sr25519::Public>("Dave");
+	let derived: AccountId = derive_account_from_rialto_id(bp_runtime::SourceAccount::Account(dave));
+	assert_eq!(
+		derived.to_string(),
+		"5G81vRqUUysQGtN5aEThD5UsLdt4rZWSbVLkjuZzLHadp8ZD".to_string()
+	);
+}