XDM: Relayer and Fraud proof updates

crates/pallet-domains/src/lib.rs

@@ -1988,6 +1988,13 @@ impl<T: Config> Pallet<T> {
             .unwrap_or_default()
     }
 
+    pub fn latest_confirmed_domain_block(
+        domain_id: DomainId,
+    ) -> Option<(DomainBlockNumberFor<T>, T::DomainHash)> {
+        LatestConfirmedDomainBlock::<T>::get(domain_id)
+            .map(|block| (block.block_number, block.block_hash))
+    }
+
     /// Returns the domain block limit of the given domain.
     pub fn domain_block_limit(domain_id: DomainId) -> Option<DomainBlockLimit> {
         DomainRegistry::<T>::get(domain_id).map(|domain_obj| DomainBlockLimit {

crates/pallet-domains/src/tests.rs

@@ -353,6 +353,7 @@ pub(crate) struct MockDomainFraudProofExtension {
     bundle_slot_probability: (u64, u64),
     operator_stake: Balance,
     maybe_illegal_extrinsic_index: Option<u32>,
+    is_valid_xdm: Option<bool>,
 }
 
 impl FraudProofHostFunctions for MockDomainFraudProofExtension {
@@ -432,6 +433,9 @@ impl FraudProofHostFunctions for MockDomainFraudProofExtension {
             FraudProofVerificationInfoRequest::StorageKey { .. } => {
                 FraudProofVerificationInfoResponse::StorageKey(None)
             }
+            FraudProofVerificationInfoRequest::XDMValidationCheck { .. } => {
+                FraudProofVerificationInfoResponse::XDMValidationCheck(self.is_valid_xdm)
+            }
         };
 
         Some(response)
@@ -1032,6 +1036,7 @@ fn test_invalid_domain_extrinsic_root_proof() {
         operator_stake: 10 * SSC,
         bundle_slot_probability: (0, 0),
         maybe_illegal_extrinsic_index: None,
+        is_valid_xdm: None,
     }));
     ext.register_extension(fraud_proof_ext);
 
@@ -1113,6 +1118,7 @@ fn test_true_invalid_bundles_inherent_extrinsic_proof() {
         operator_stake: 10 * SSC,
         bundle_slot_probability: (0, 0),
         maybe_illegal_extrinsic_index: None,
+        is_valid_xdm: None,
     }));
     ext.register_extension(fraud_proof_ext);
 
@@ -1180,6 +1186,7 @@ fn test_false_invalid_bundles_inherent_extrinsic_proof() {
         operator_stake: 10 * SSC,
         bundle_slot_probability: (0, 0),
         maybe_illegal_extrinsic_index: None,
+        is_valid_xdm: None,
     }));
     ext.register_extension(fraud_proof_ext);
 

crates/sp-domains-fraud-proof/src/fraud_proof.rs

@@ -382,6 +382,9 @@ pub enum VerificationError<DomainHash> {
         error("Failed to check if a given extrinsic is inherent or not")
     )]
     FailedToCheckInherentExtrinsic,
+    /// Failed to check if a given extrinsic is inherent or not.
+    #[cfg_attr(feature = "thiserror", error("Failed to validate given XDM"))]
+    FailedToValidateXDM,
     /// Failed to check if a given extrinsic is decodable or not.
     #[cfg_attr(
         feature = "thiserror",

crates/sp-domains-fraud-proof/src/host_functions.rs

@@ -81,33 +81,33 @@ impl FraudProofExtension {
 }
 
 /// Trait Impl to query and verify Domains Fraud proof.
-pub struct FraudProofHostFunctionsImpl<Block, Client, DomainBlock, Executor> {
+pub struct FraudProofHostFunctionsImpl<Block, Client, DomainBlock, Executor, EFC> {
     consensus_client: Arc<Client>,
     executor: Arc<Executor>,
-    domain_extensions_factory: Box<dyn ExtensionsFactory<DomainBlock>>,
+    domain_extensions_factory_creator: EFC,
     _phantom: PhantomData<(Block, DomainBlock)>,
 }
 
-impl<Block, Client, DomainBlock, Executor>
-    FraudProofHostFunctionsImpl<Block, Client, DomainBlock, Executor>
+impl<Block, Client, DomainBlock, Executor, EFC>
+    FraudProofHostFunctionsImpl<Block, Client, DomainBlock, Executor, EFC>
 {
     pub fn new(
         consensus_client: Arc<Client>,
         executor: Arc<Executor>,
-        domain_extensions_factory: Box<dyn ExtensionsFactory<DomainBlock>>,
+        domain_extensions_factory_creator: EFC,
     ) -> Self {
         FraudProofHostFunctionsImpl {
             consensus_client,
             executor,
-            domain_extensions_factory,
+            domain_extensions_factory_creator,
             _phantom: Default::default(),
         }
     }
 }
 
 // TODO: Revisit the host function implementation once we decide best strategy to structure them.
-impl<Block, Client, DomainBlock, Executor>
-    FraudProofHostFunctionsImpl<Block, Client, DomainBlock, Executor>
+impl<Block, Client, DomainBlock, Executor, EFC>
+    FraudProofHostFunctionsImpl<Block, Client, DomainBlock, Executor, EFC>
 where
     Block: BlockT,
     Block::Hash: From<H256>,
@@ -116,6 +116,7 @@ where
     Client: BlockBackend<Block> + HeaderBackend<Block> + ProvideRuntimeApi<Block>,
     Client::Api: DomainsApi<Block, DomainBlock::Header> + BundleProducerElectionApi<Block, Balance>,
     Executor: CodeExecutor + RuntimeVersionOf,
+    EFC: Fn(Arc<Client>, Arc<Executor>) -> Box<dyn ExtensionsFactory<DomainBlock>> + Send + Sync,
 {
     fn get_block_randomness(&self, consensus_block_hash: H256) -> Option<Randomness> {
         let runtime_api = self.consensus_client.runtime_api();
@@ -293,6 +294,36 @@ where
             .ok()
     }
 
+    fn is_valid_xdm(
+        &self,
+        consensus_block_hash: H256,
+        domain_id: DomainId,
+        opaque_extrinsic: OpaqueExtrinsic,
+    ) -> Option<bool> {
+        let runtime_code = self.get_domain_runtime_code(consensus_block_hash, domain_id)?;
+        let mut domain_stateless_runtime =
+            StatelessRuntime::<DomainBlock, _>::new(self.executor.clone(), runtime_code.into());
+        let extension_factory = (self.domain_extensions_factory_creator)(
+            self.consensus_client.clone(),
+            self.executor.clone(),
+        );
+        domain_stateless_runtime.set_extension_factory(extension_factory);
+
+        let consensus_api = self.consensus_client.runtime_api();
+        let domain_initial_state = consensus_api
+            .domain_instance_data(consensus_block_hash.into(), domain_id)
+            .expect("Runtime Api must not fail. This is unrecoverable error")?
+            .0
+            .raw_genesis
+            .into_storage();
+        domain_stateless_runtime.set_storage(domain_initial_state);
+
+        let encoded_extrinsic = opaque_extrinsic.encode();
+        domain_stateless_runtime
+            .is_valid_xdm(encoded_extrinsic)
+            .expect("Runtime api must not fail. This is an unrecoverable error")
+    }
+
     fn is_decodable_extrinsic(
         &self,
         consensus_block_hash: H256,
@@ -385,8 +416,8 @@ where
     }
 }
 
-impl<Block, Client, DomainBlock, Executor> FraudProofHostFunctions
-    for FraudProofHostFunctionsImpl<Block, Client, DomainBlock, Executor>
+impl<Block, Client, DomainBlock, Executor, EFC> FraudProofHostFunctions
+    for FraudProofHostFunctionsImpl<Block, Client, DomainBlock, Executor, EFC>
 where
     Block: BlockT,
     Block::Hash: From<H256>,
@@ -396,6 +427,7 @@ where
     Client: BlockBackend<Block> + HeaderBackend<Block> + ProvideRuntimeApi<Block>,
     Client::Api: DomainsApi<Block, DomainBlock::Header> + BundleProducerElectionApi<Block, Balance>,
     Executor: CodeExecutor + RuntimeVersionOf,
+    EFC: Fn(Arc<Client>, Arc<Executor>) -> Box<dyn ExtensionsFactory<DomainBlock>> + Send + Sync,
 {
     fn get_fraud_proof_verification_info(
         &self,
@@ -511,6 +543,12 @@ where
                     self.storage_key(consensus_block_hash, domain_id, req),
                 ))
             }
+            FraudProofVerificationInfoRequest::XDMValidationCheck {
+                domain_id,
+                opaque_extrinsic,
+            } => Some(FraudProofVerificationInfoResponse::XDMValidationCheck(
+                self.is_valid_xdm(consensus_block_hash, domain_id, opaque_extrinsic),
+            )),
         }
     }
 
@@ -570,9 +608,11 @@ where
         };
 
         let (domain_block_number, domain_block_hash) = domain_block_id;
-        let mut domain_extensions = self
-            .domain_extensions_factory
-            .extensions_for(domain_block_hash.into(), domain_block_number.into());
+        let mut domain_extensions = (self.domain_extensions_factory_creator)(
+            self.consensus_client.clone(),
+            self.executor.clone(),
+        )
+        .extensions_for(domain_block_hash.into(), domain_block_number.into());
 
         execution_proof_check::<<DomainBlock::Header as HeaderT>::Hashing, _>(
             pre_state_root.into(),

crates/sp-domains-fraud-proof/src/lib.rs

@@ -126,6 +126,12 @@ pub enum FraudProofVerificationInfoRequest {
         /// Extrinsic for which we need to if it is decodable or not.
         opaque_extrinsic: OpaqueExtrinsic,
     },
+    /// Request to check if the XDM is valid
+    XDMValidationCheck {
+        domain_id: DomainId,
+        /// Encoded XDM extrinsic that needs to be validated.
+        opaque_extrinsic: OpaqueExtrinsic,
+    },
     /// Request to get Domain election params.
     DomainElectionParams { domain_id: DomainId },
     /// Request to get Operator stake.
@@ -184,6 +190,9 @@ pub enum FraudProofVerificationInfoResponse {
     TxRangeCheck(bool),
     /// If the particular extrinsic provided is either inherent or not.
     InherentExtrinsicCheck(bool),
+    /// If the particular xdm extrinsic is valid or not.
+    /// Returns None if extrinsic is not an XDM
+    XDMValidationCheck(Option<bool>),
     /// If the domain extrinsic is decodable or not.
     ExtrinsicDecodableCheck(bool),
     /// Domain's total stake at a given Consensus hash.
@@ -262,6 +271,13 @@ impl FraudProofVerificationInfoResponse {
         }
     }
 
+    pub fn into_xdm_validation_check(self) -> Option<bool> {
+        match self {
+            FraudProofVerificationInfoResponse::XDMValidationCheck(maybe_valid) => maybe_valid,
+            _ => None,
+        }
+    }
+
     pub fn into_extrinsic_decodable_check(self) -> Option<bool> {
         match self {
             FraudProofVerificationInfoResponse::ExtrinsicDecodableCheck(is_decodable) => {

crates/sp-domains-fraud-proof/src/verification.rs

@@ -629,9 +629,32 @@ where
             }
             Ok(())
         }
+        InvalidBundleType::InvalidXDM(extrinsic_index) => {
+            let extrinsic = get_extrinsic_from_proof::<DomainHeader>(
+                *extrinsic_index,
+                invalid_bundle_entry.extrinsics_root,
+                invalid_bundles_fraud_proof.proof_data.clone(),
+            )?;
 
-        // TODO: implement the other invalid bundle types
-        _ => Err(VerificationError::InvalidProof),
+            let is_valid_xdm = get_fraud_proof_verification_info(
+                H256::from_slice(bad_receipt.consensus_block_hash.as_ref()),
+                FraudProofVerificationInfoRequest::XDMValidationCheck {
+                    domain_id: invalid_bundles_fraud_proof.domain_id,
+                    opaque_extrinsic: extrinsic,
+                },
+            )
+            .and_then(FraudProofVerificationInfoResponse::into_xdm_validation_check)
+            .ok_or(VerificationError::FailedToValidateXDM)?;
+
+            // Proof to be considered valid only,
+            // If it is true invalid fraud proof then extrinsic must be an invalid xdm and
+            // If it is false invalid fraud proof then extrinsic must be a valid xdm
+            if is_valid_xdm != invalid_bundles_fraud_proof.is_true_invalid_fraud_proof {
+                Ok(())
+            } else {
+                Err(VerificationError::InvalidProof)
+            }
+        }
     }
 }
 

crates/sp-domains/src/lib.rs

@@ -1004,8 +1004,8 @@ impl InvalidBundleType {
             Self::UndecodableTx(_) => 1,
             Self::OutOfRangeTx(_) => 2,
             Self::InherentExtrinsic(_) => 3,
-            Self::IllegalTx(_) => 4,
-            Self::InvalidXDM(_) => 5,
+            Self::InvalidXDM(_) => 4,
+            Self::IllegalTx(_) => 5,
         }
     }
 
@@ -1245,9 +1245,12 @@ sp_api::decl_runtime_apis! {
         /// Returns the execution receipt hash of the given domain and domain block number
         fn receipt_hash(domain_id: DomainId, domain_number: HeaderNumberFor<DomainHeader>) -> Option<HeaderHashFor<DomainHeader>>;
 
-        /// Reture the consensus chain byte fee that will used to charge the domain transaction for consensus
+        /// Return the consensus chain byte fee that will used to charge the domain transaction for consensus
         /// chain storage fee
         fn consensus_chain_byte_fee() -> Balance;
+
+        /// Returns the latest confirmed domain block number and hash
+        fn latest_confirmed_domain_block(domain_id: DomainId) -> Option<(HeaderNumberFor<DomainHeader>, HeaderHashFor<DomainHeader>)>;
     }
 
     pub trait BundleProducerElectionApi<Balance: Encode + Decode> {