feat(starknet_state_sync): implement state sync get compiled class

crates/starknet_gateway/src/sync_state_reader.rs

@@ -3,6 +3,7 @@ use blockifier::state::errors::StateError;
 use blockifier::state::state_api::{StateReader as BlockifierStateReader, StateResult};
 use futures::executor::block_on;
 use starknet_api::block::{BlockInfo, BlockNumber};
+use starknet_api::contract_class::ContractClass;
 use starknet_api::core::{ClassHash, CompiledClassHash, ContractAddress, Nonce};
 use starknet_api::state::StorageKey;
 use starknet_state_sync_types::communication::SharedStateSyncClient;
@@ -55,8 +56,20 @@ impl BlockifierStateReader for SyncStateReader {
         Ok(res)
     }
 
-    fn get_compiled_class(&self, _class_hash: ClassHash) -> StateResult<RunnableCompiledClass> {
-        todo!()
+    fn get_compiled_class(&self, class_hash: ClassHash) -> StateResult<RunnableCompiledClass> {
+        let contract_class = block_on(
+            self.state_sync_client.get_compiled_class_deprecated(self.block_number, class_hash),
+        )
+        .map_err(|e| StateError::StateReadError(e.to_string()))?;
+
+        match contract_class {
+            ContractClass::V1(casm_contract_class) => {
+                Ok(RunnableCompiledClass::V1(casm_contract_class.try_into()?))
+            }
+            ContractClass::V0(deprecated_contract_class) => {
+                Ok(RunnableCompiledClass::V0(deprecated_contract_class.try_into()?))
+            }
+        }
     }
 
     fn get_class_hash_at(&self, contract_address: ContractAddress) -> StateResult<ClassHash> {

crates/starknet_state_sync/src/lib.rs

@@ -3,10 +3,12 @@ pub mod runner;
 
 use async_trait::async_trait;
 use papyrus_storage::body::BodyStorageReader;
+use papyrus_storage::compiled_class::CasmStorageReader;
 use papyrus_storage::db::TransactionKind;
 use papyrus_storage::state::StateStorageReader;
 use papyrus_storage::{StorageReader, StorageTxn};
 use starknet_api::block::BlockNumber;
+use starknet_api::contract_class::{ContractClass, SierraVersion};
 use starknet_api::core::{ClassHash, ContractAddress, Nonce, BLOCK_HASH_TABLE_ADDRESS};
 use starknet_api::state::{StateNumber, StorageKey};
 use starknet_sequencer_infra::component_definitions::{ComponentRequestHandler, ComponentStarter};
@@ -55,6 +57,11 @@ impl ComponentRequestHandler<StateSyncRequest, StateSyncResponse> for StateSync
                     self.get_class_hash_at(block_number, contract_address),
                 )
             }
+            StateSyncRequest::GetCompiledClassDeprecated(block_number, class_hash) => {
+                StateSyncResponse::GetCompiledClassDeprecated(
+                    self.get_compiled_class_deprecated(block_number, class_hash),
+                )
+            }
         }
     }
 }
@@ -134,6 +141,46 @@ impl StateSync {
             .ok_or(StateSyncError::ContractNotFound(contract_address))?;
         Ok(class_hash)
     }
+
+    fn get_compiled_class_deprecated(
+        &self,
+        block_number: BlockNumber,
+        class_hash: ClassHash,
+    ) -> StateSyncResult<ContractClass> {
+        let txn = self.storage_reader.begin_ro_txn()?;
+        let latest_block_number = txn.get_compiled_class_marker()?.prev();
+        if latest_block_number.is_none_or(|latest_block_number| latest_block_number < block_number)
+        {
+            return Err(StateSyncError::BlockNotFound(block_number));
+        }
+
+        let state_reader = txn.get_state_reader()?;
+
+        // Check if this class exists in the Cairo1 classes table.
+        if let Some(class_definition_block_number) =
+            state_reader.get_class_definition_block_number(&class_hash)?
+        {
+            if class_definition_block_number > block_number {
+                return Err(StateSyncError::ClassNotFound(class_hash));
+            }
+
+            let (option_casm, option_sierra) = txn.get_casm_and_sierra(&class_hash)?;
+
+            // Check if both options are `Some`. If not, since we verified the block number is
+            // smaller than the casm marker, we return that the class doesnt exist.
+            let (casm, sierra) =
+                option_casm.zip(option_sierra).ok_or(StateSyncError::ClassNotFound(class_hash))?;
+            let sierra_version = SierraVersion::extract_from_program(&sierra.sierra_program)?;
+            return Ok(ContractClass::V1((casm, sierra_version)));
+        }
+
+        // Check if this class exists in the Cairo0 classes table.
+        let state_number = StateNumber::unchecked_right_after_block(block_number);
+        let deprecated_compiled_contract_class = state_reader
+            .get_deprecated_class_definition_at(state_number, &class_hash)?
+            .ok_or(StateSyncError::ClassNotFound(class_hash))?;
+        Ok(ContractClass::V0(deprecated_compiled_contract_class))
+    }
 }
 
 fn verify_synced_up_to<Mode: TransactionKind>(

crates/starknet_state_sync_types/src/communication.rs

@@ -4,6 +4,7 @@ use async_trait::async_trait;
 use papyrus_proc_macros::handle_response_variants;
 use serde::{Deserialize, Serialize};
 use starknet_api::block::BlockNumber;
+use starknet_api::contract_class::ContractClass;
 use starknet_api::core::{ClassHash, ContractAddress, Nonce};
 use starknet_api::state::StorageKey;
 use starknet_sequencer_infra::component_client::{
@@ -56,7 +57,13 @@ pub trait StateSyncClient: Send + Sync {
         contract_address: ContractAddress,
     ) -> StateSyncClientResult<ClassHash>;
 
-    // TODO: Add get_compiled_class for StateSyncReader
+    // TODO: Remove this and fix sync state reader once the compiler component is ready.
+    async fn get_compiled_class_deprecated(
+        &self,
+        block_number: BlockNumber,
+        class_hash: ClassHash,
+    ) -> StateSyncClientResult<ContractClass>;
+
     // TODO: Add get_compiled_class_hash for StateSyncReader
     // TODO: Add get_block_info for StateSyncReader
 }
@@ -83,6 +90,7 @@ pub enum StateSyncRequest {
     GetStorageAt(BlockNumber, ContractAddress, StorageKey),
     GetNonceAt(BlockNumber, ContractAddress),
     GetClassHashAt(BlockNumber, ContractAddress),
+    GetCompiledClassDeprecated(BlockNumber, ClassHash),
 }
 
 #[derive(Clone, Debug, Serialize, Deserialize)]
@@ -92,6 +100,7 @@ pub enum StateSyncResponse {
     GetStorageAt(StateSyncResult<Felt>),
     GetNonceAt(StateSyncResult<Nonce>),
     GetClassHashAt(StateSyncResult<ClassHash>),
+    GetCompiledClassDeprecated(StateSyncResult<ContractClass>),
 }
 
 #[async_trait]
@@ -165,6 +174,21 @@ impl StateSyncClient for LocalStateSyncClient {
             StateSyncError
         )
     }
+
+    async fn get_compiled_class_deprecated(
+        &self,
+        block_number: BlockNumber,
+        class_hash: ClassHash,
+    ) -> StateSyncClientResult<ContractClass> {
+        let request = StateSyncRequest::GetCompiledClassDeprecated(block_number, class_hash);
+        let response = self.send(request).await;
+        handle_response_variants!(
+            StateSyncResponse,
+            GetCompiledClassDeprecated,
+            StateSyncClientError,
+            StateSyncError
+        )
+    }
 }
 
 #[async_trait]
@@ -238,4 +262,19 @@ impl StateSyncClient for RemoteStateSyncClient {
             StateSyncError
         )
     }
+
+    async fn get_compiled_class_deprecated(
+        &self,
+        block_number: BlockNumber,
+        class_hash: ClassHash,
+    ) -> StateSyncClientResult<ContractClass> {
+        let request = StateSyncRequest::GetCompiledClassDeprecated(block_number, class_hash);
+        let response = self.send(request).await;
+        handle_response_variants!(
+            StateSyncResponse,
+            GetCompiledClassDeprecated,
+            StateSyncClientError,
+            StateSyncError
+        )
+    }
 }

crates/starknet_state_sync_types/src/errors.rs

@@ -1,7 +1,8 @@
 use papyrus_storage::StorageError;
 use serde::{Deserialize, Serialize};
 use starknet_api::block::BlockNumber;
-use starknet_api::core::ContractAddress;
+use starknet_api::core::{ClassHash, ContractAddress};
+use starknet_api::StarknetApiError;
 use thiserror::Error;
 
 #[derive(Debug, Error, Serialize, Deserialize, Clone)]
@@ -12,14 +13,24 @@ pub enum StateSyncError {
     BlockNotFound(BlockNumber),
     #[error("Contract address {0} was not found")]
     ContractNotFound(ContractAddress),
-    // StorageError does not derive Serialize, Deserialize and Clone Traits.
-    // We put the string of the error instead.
+    #[error("Class hash {0} was not found")]
+    ClassNotFound(ClassHash),
+    // StorageError and StarknetApiError do not derive Serialize, Deserialize and Clone Traits.
+    // We put the string of the errors instead.
     #[error("Unexpected storage error: {0}")]
     StorageError(String),
+    #[error("Unexpected starknet api error: {0}")]
+    StarknetApiError(String),
 }
 
 impl From<StorageError> for StateSyncError {
     fn from(error: StorageError) -> Self {
         StateSyncError::StorageError(error.to_string())
     }
 }
+
+impl From<StarknetApiError> for StateSyncError {
+    fn from(error: StarknetApiError) -> Self {
+        StateSyncError::StarknetApiError(error.to_string())
+    }
+}