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)
+
+	// EnclavePublicConfig returns network data that is known to the enclave but can be shared publicly
+	EnclavePublicConfig() (*EnclavePublicConfig, SystemError)
 }
 
 // BlockSubmissionResponse is the response sent from the enclave back to the node after ingesting a block
@@ -151,3 +154,7 @@ type ProducedSecretResponse struct {
 	RequesterID gethcommon.Address
 	HostAddress string
 }
+
+type EnclavePublicConfig struct {
+	L2MessageBusAddress gethcommon.Address
+}

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
 }