Stored conversion rate updater (#1005)

* update conversion rate: initial commit

* Rialto=Polkadot && Millau=Kusama + actually update conversion rates

* update deployment scripts and readme

* allow non-zero difference between stored and real rates

* dummy commit

* Revert "dummy commit"

This reverts commit a438198180a8385feeaaca60c9d2da0950465215.

* clippy

* #[allow(clippy::float_cmp)] in conversion rate update

* dummy

* Revert "dummy"

This reverts commit 90cd6e47cda56f655e94dbef76138e6cc58d664a.

* spell

* shared_value_ref() -> get()

* Revert "shared_value_ref() -> get()"

This reverts commit 20aa30de6a59b2099cfba3e9676e71200b7bb468.

bridges/relays/bin-substrate/src/chains/millau_messages_to_rialto.rs

@@ -245,3 +245,33 @@ pub(crate) fn add_standalone_metrics(
 		)),
 	)
 }
+
+/// Update Rialto -> Millau conversion rate, stored in Millau runtime storage.
+pub(crate) async fn update_rialto_to_millau_conversion_rate(
+	client: Client<Millau>,
+	signer: <Millau as TransactionSignScheme>::AccountKeyPair,
+	updated_rate: f64,
+) -> anyhow::Result<()> {
+	let genesis_hash = *client.genesis_hash();
+	let signer_id = (*signer.public().as_array_ref()).into();
+	client
+		.submit_signed_extrinsic(signer_id, move |transaction_nonce| {
+			Bytes(
+				Millau::sign_transaction(
+					genesis_hash,
+					&signer,
+					transaction_nonce,
+					millau_runtime::MessagesCall::update_pallet_parameter(
+						millau_runtime::rialto_messages::MillauToRialtoMessagesParameter::RialtoToMillauConversionRate(
+							sp_runtime::FixedU128::from_float(updated_rate),
+						),
+					)
+					.into(),
+				)
+				.encode(),
+			)
+		})
+		.await
+		.map(drop)
+		.map_err(|err| anyhow::format_err!("{:?}", err))
+}

bridges/relays/bin-substrate/src/chains/mod.rs

@@ -37,9 +37,9 @@ mod wococo;
 // Rialto as BTC and Millau as wBTC (only in relayer).
 
 /// The identifier of token, which value is associated with Rialto token value by relayer.
-pub(crate) const RIALTO_ASSOCIATED_TOKEN_ID: &str = "bitcoin";
+pub(crate) const RIALTO_ASSOCIATED_TOKEN_ID: &str = "polkadot";
 /// The identifier of token, which value is associated with Millau token value by relayer.
-pub(crate) const MILLAU_ASSOCIATED_TOKEN_ID: &str = "wrapped-bitcoin";
+pub(crate) const MILLAU_ASSOCIATED_TOKEN_ID: &str = "kusama";
 
 use relay_utils::metrics::MetricsParams;
 

bridges/relays/bin-substrate/src/chains/rialto_messages_to_millau.rs

@@ -244,3 +244,33 @@ pub(crate) fn add_standalone_metrics(
 		)),
 	)
 }
+
+/// Update Millau -> Rialto conversion rate, stored in Rialto runtime storage.
+pub(crate) async fn update_millau_to_rialto_conversion_rate(
+	client: Client<Rialto>,
+	signer: <Rialto as TransactionSignScheme>::AccountKeyPair,
+	updated_rate: f64,
+) -> anyhow::Result<()> {
+	let genesis_hash = *client.genesis_hash();
+	let signer_id = (*signer.public().as_array_ref()).into();
+	client
+		.submit_signed_extrinsic(signer_id, move |transaction_nonce| {
+			Bytes(
+				Rialto::sign_transaction(
+					genesis_hash,
+					&signer,
+					transaction_nonce,
+					rialto_runtime::MessagesCall::update_pallet_parameter(
+						rialto_runtime::millau_messages::RialtoToMillauMessagesParameter::MillauToRialtoConversionRate(
+							sp_runtime::FixedU128::from_float(updated_rate),
+						),
+					)
+					.into(),
+				)
+				.encode(),
+			)
+		})
+		.await
+		.map(drop)
+		.map_err(|err| anyhow::format_err!("{:?}", err))
+}