Contract addresses: Have host fetch L2 Msg Bus address from enclave

go/common/enclave.go

@@ -137,6 +137,9 @@ type EnclaveScan interface {
 
 	// GetPublicTransactionData returns a list of public transaction data
 	GetPublicTransactionData(pagination *QueryPagination) (*TransactionListingResponse, SystemError)
+
+	// GetL2MessageBusAddress returns the address of the L2 message bus contract
+	GetL2MessageBusAddress() (gethcommon.Address, SystemError)
 }
 
 // BlockSubmissionResponse is the response sent from the enclave back to the node after ingesting a block

go/common/query_types.go

@@ -89,5 +89,6 @@ type ObscuroNetworkInfo struct {
 	L1StartHash               common.Hash
 	SequencerID               common.Address
 	MessageBusAddress         common.Address
+	L2MessageBusAddress       common.Address
 	ImportantContracts        map[string]common.Address // map of contract name to address
 }