add get transaction by hash rpc method

common/src/rpc_primitives/requests.rs

@@ -39,6 +39,11 @@ pub struct GetAccountBalanceRequest {
     pub address: String,
 }
 
+#[derive(Serialize, Deserialize, Debug)]
+pub struct GetTransactionByHashRequest {
+    pub hash: String,
+}
+
 parse_request!(HelloRequest);
 parse_request!(RegisterAccountRequest);
 parse_request!(SendTxRequest);
@@ -46,6 +51,7 @@ parse_request!(GetBlockDataRequest);
 parse_request!(GetGenesisIdRequest);
 parse_request!(GetLastBlockRequest);
 parse_request!(GetAccountBalanceRequest);
+parse_request!(GetTransactionByHashRequest);
 
 #[derive(Serialize, Deserialize, Debug)]
 pub struct HelloResponse {
@@ -81,3 +87,8 @@ pub struct GetLastBlockResponse {
 pub struct GetAccountBalanceResponse {
     pub balance: u64,
 }
+
+#[derive(Serialize, Deserialize, Debug)]
+pub struct GetTransactionByHashResponse {
+    pub transaction: Option<Transaction>,
+}

sequencer_core/src/sequencer_store/block_store.rs

@@ -1,11 +1,12 @@
-use std::path::Path;
+use std::{collections::HashMap, path::Path};
 
 use anyhow::Result;
-use common::block::Block;
+use common::{block::Block, merkle_tree_public::TreeHashType, transaction::Transaction};
 use storage::RocksDBIO;
 
 pub struct SequecerBlockStore {
     dbio: RocksDBIO,
+    tx_hash_to_block_map: HashMap<TreeHashType, u64>,
     pub genesis_id: u64,
 }
 
@@ -15,11 +16,21 @@ impl SequecerBlockStore {
     ///
     /// ATTENTION: Will overwrite genesis block.
     pub fn open_db_with_genesis(location: &Path, genesis_block: Option<Block>) -> Result<Self> {
+        let tx_hash_to_block_map = if let Some(block) = &genesis_block {
+            block_to_transactions_map(block)
+        } else {
+            HashMap::new()
+        };
+
         let dbio = RocksDBIO::new(location, genesis_block)?;
 
         let genesis_id = dbio.get_meta_first_block_in_db()?;
 
-        Ok(Self { dbio, genesis_id })
+        Ok(Self {
+            dbio,
+            genesis_id,
+            tx_hash_to_block_map,
+        })
     }
 
     ///Reopening existing database
@@ -31,7 +42,31 @@ impl SequecerBlockStore {
         Ok(self.dbio.get_block(id)?)
     }
 
-    pub fn put_block_at_id(&self, block: Block) -> Result<()> {
-        Ok(self.dbio.put_block(block, false)?)
+    pub fn put_block_at_id(&mut self, block: Block) -> Result<()> {
+        let new_transactions_map = block_to_transactions_map(&block);
+        self.dbio.put_block(block, false)?;
+        self.tx_hash_to_block_map.extend(new_transactions_map);
+        Ok(())
+    }
+
+    pub fn get_transaction_by_hash(&self, hash: TreeHashType) -> Option<Transaction> {
+        let block_id = self.tx_hash_to_block_map.get(&hash);
+        let block = block_id.map(|&id| self.get_block_at_id(id));
+        if let Some(Ok(block)) = block {
+            for transaction in block.transactions.into_iter() {
+                if transaction.hash() == hash {
+                    return Some(transaction);
+                }
+            }
+        }
+        None
     }
 }
+
+fn block_to_transactions_map(block: &Block) -> HashMap<TreeHashType, u64> {
+    block
+        .transactions
+        .iter()
+        .map(|transaction| (transaction.hash(), block.block_id))
+        .collect()
+}

sequencer_rpc/src/process.rs

@@ -1,11 +1,17 @@
 use actix_web::Error as HttpError;
 use serde_json::Value;
 
-use common::rpc_primitives::{
-    errors::{RpcError, RpcParseError},
-    message::{Message, Request},
-    parser::RpcRequest,
-    requests::{GetAccountBalanceRequest, GetAccountBalanceResponse},
+use common::{
+    merkle_tree_public::TreeHashType,
+    rpc_primitives::{
+        errors::{RpcError, RpcParseError},
+        message::{Message, Request},
+        parser::RpcRequest,
+        requests::{
+            GetAccountBalanceRequest, GetAccountBalanceResponse, GetTransactionByHashRequest,
+            GetTransactionByHashResponse,
+        },
+    },
 };
 
 use common::rpc_primitives::requests::{
@@ -23,6 +29,7 @@ pub const GET_BLOCK: &str = "get_block";
 pub const GET_GENESIS: &str = "get_genesis";
 pub const GET_LAST_BLOCK: &str = "get_last_block";
 pub const GET_ACCOUNT_BALANCE: &str = "get_account_balance";
+pub const GET_TRANSACTION_BY_HASH: &str = "get_transaction_by_hash";
 
 pub const HELLO_FROM_SEQUENCER: &str = "HELLO_FROM_SEQUENCER";
 
@@ -156,6 +163,21 @@ impl JsonHandler {
 
         respond(helperstruct)
     }
+    async fn process_get_transaction_by_hash(&self, request: Request) -> Result<Value, RpcErr> {
+        let get_transaction_req = GetTransactionByHashRequest::parse(Some(request.params))?;
+        let bytes: Vec<u8> = hex::decode(get_transaction_req.hash)
+            .map_err(|_| RpcParseError("invalid hash".to_string()))?;
+        let hash: TreeHashType = bytes
+            .try_into()
+            .map_err(|_| RpcParseError("invalid hash".to_string()))?;
+
+        let transaction = {
+            let state = self.sequencer_state.lock().await;
+            state.store.block_store.get_transaction_by_hash(hash)
+        };
+        let helperstruct = GetTransactionByHashResponse { transaction };
+        respond(helperstruct)
+    }
 
     pub async fn process_request_internal(&self, request: Request) -> Result<Value, RpcErr> {
         match request.method.as_ref() {
@@ -166,6 +188,7 @@ impl JsonHandler {
             GET_GENESIS => self.process_get_genesis(request).await,
             GET_LAST_BLOCK => self.process_get_last_block(request).await,
             GET_ACCOUNT_BALANCE => self.process_get_account_balance(request).await,
+            GET_TRANSACTION_BY_HASH => self.process_get_transaction_by_hash(request).await,
             _ => Err(RpcErr(RpcError::method_not_found(request.method))),
         }
     }
@@ -315,4 +338,26 @@ mod tests {
 
         assert_eq!(response, expected_response);
     }
+
+    #[actix_web::test]
+    async fn test_get_transaction_by_hash_for_non_existent_hash() {
+        let json_handler = json_handler_for_tests();
+        let request = serde_json::json!({
+            "jsonrpc": "2.0",
+            "method": "get_transaction_by_hash",
+            "params": { "hash": "cafe".repeat(16) },
+            "id": 1
+        });
+        let expected_response = serde_json::json!({
+            "id": 1,
+            "jsonrpc": "2.0",
+            "result": {
+                "transaction": Value::Null
+            }
+        });
+
+        let response = call_rpc_handler_with_json(json_handler, request).await;
+
+        assert_eq!(response, expected_response);
+    }
 }