Update starknet header to include l2 gas price (#197)

This PR adds the field. It's marked optional so that it works on older
streams.

Author: fracek

change/@apibara-starknet-79e122c4-6fa1-458b-bef9-d5a2038f8670.json

@@ -0,0 +1,7 @@
+{
+  "type": "prerelease",
+  "comment": "starknet: add l2 gas price header prop",
+  "packageName": "@apibara/starknet",
+  "email": "[email protected]",
+  "dependentChangeType": "patch"
+}

packages/starknet/proto/data.proto

@@ -50,6 +50,8 @@ message BlockHeader {
   ResourcePrice l1_data_gas_price = 9;
   // L1 data availability mode.
   L1DataAvailabilityMode l1_data_availability_mode = 10;
+  // Price of L2 gas in the block.
+  ResourcePrice l2_gas_price = 11;
 }
 
 // A transaction.
@@ -523,4 +525,4 @@ enum CallType {
   CALL_TYPE_LIBRARY_CALL = 1;
   CALL_TYPE_CALL = 2;
   CALL_TYPE_DELEGATE = 3;
-}
+}

packages/starknet/src/block.ts

@@ -182,6 +182,7 @@ export type DataAvailabilityMode = CodecType<typeof DataAvailabilityMode>;
  * @prop l1GasPrice Calldata gas price.
  * @prop l1DataGasPrice Blob gas price.
  * @prop l1DataAvailabilityMode How data is posted to L1.
+ * @prop l2GasPrice L2 gas price.
  */
 export const BlockHeader = MessageCodec({
   blockHash: OptionalCodec(FieldElement),
@@ -194,6 +195,7 @@ export const BlockHeader = MessageCodec({
   l1GasPrice: RequiredCodec(ResourcePrice),
   l1DataGasPrice: RequiredCodec(ResourcePrice),
   l1DataAvailabilityMode: RequiredCodec(L1DataAvailabilityMode),
+  l2GasPrice: OptionalCodec(ResourcePrice),
 });
 
 export type BlockHeader = Readonly<CodecType<typeof BlockHeader>>;