Feat: eth_simulateV1 Request / Response types (#1042)

* Feat: eth_simulateV1 Request / Response types

* Update lib.rs

* Update simulate.rs

* fmt

* Update simulate.rs

* Update simulate.rs

* Delete crates/rpc-types-trace/src/simulate.rs

* Update lib.rs

* Create simulate.rs

* Update lib.rs

* fmt

* fmt

* Update lib.rs

* Update lib.rs

* touchups

* fix type

---------

Co-authored-by: Matthias Seitz <[email protected]>

crates/rpc-types-eth/src/lib.rs

@@ -49,3 +49,5 @@ pub use work::Work;
 
 /// This module provides implementations for EIP-4337.
 pub mod eip4337;
+
+pub mod simulate;

crates/rpc-types-eth/src/simulate.rs

@@ -0,0 +1,184 @@
+//! 'eth_simulateV1' Request / Response types: <https://github.com/ethereum/execution-apis/pull/484>
+
+use alloy_primitives::{Address, Bytes, Log, B256};
+use serde::{Deserialize, Serialize};
+
+use crate::{state::StateOverride, BlockOverrides, TransactionRequest};
+
+/// The maximum number of blocks that can be simulated in a single request,
+pub const MAX_SIMULATE_BLOCKS: u64 = 256;
+
+/// Represents a batch of calls to be simulated sequentially within a block.
+/// This struct includes block and state overrides as well as the transaction requests to be
+/// executed.
+#[derive(Clone, Debug, Serialize, Deserialize)]
+#[serde(rename_all = "camelCase")]
+pub struct SimBlock {
+    /// Modifications to the default block characteristics.
+    pub block_overrides: BlockOverrides,
+    /// State modifications to apply before executing the transactions.
+    pub state_overrides: StateOverride,
+    /// A vector of transactions to be simulated.
+    pub calls: Vec<TransactionRequest>,
+}
+/// Represents the result of simulating a block.
+#[derive(Clone, Debug, Serialize, Deserialize)]
+#[serde(rename_all = "camelCase")]
+pub struct SimulatedBlock {
+    /// The number of the block.
+    #[serde(with = "alloy_serde::quantity")]
+    pub number: u64,
+    /// The hash of the block.
+    pub hash: B256,
+    /// The timestamp of the block.
+    #[serde(with = "alloy_serde::quantity")]
+    pub timestamp: u64,
+    /// The gas limit of the block.
+    #[serde(with = "alloy_serde::quantity")]
+    pub gas_limit: u64,
+    /// The amount of gas used in the block.
+    #[serde(with = "alloy_serde::quantity")]
+    pub gas_used: u64,
+    /// The recipient of the block's fees.
+    pub fee_recipient: Address,
+    /// The base fee per gas unit for the block.
+    #[serde(with = "alloy_serde::quantity")]
+    pub base_fee_per_gas: u64,
+    /// The previous RANDAO value of the block.
+    pub prev_randao: B256,
+    /// A vector of results for each call in the block.
+    pub calls: Vec<SimCallResult>,
+}
+/// The response type for the eth_simulateV1 method.
+#[derive(Clone, Debug, Serialize, Deserialize)]
+#[serde(rename_all = "camelCase")]
+pub struct SimulateV1Response {
+    /// Simulated blocks vector.
+    pub simulated_blocks: Vec<SimulatedBlock>,
+}
+/// Captures the outcome of a transaction simulation.
+/// It includes the return value, logs produced, gas used, and the status of the transaction.
+#[derive(Clone, Debug, Serialize, Deserialize)]
+#[serde(rename_all = "camelCase")]
+pub struct SimCallResult {
+    /// The raw bytes returned by the transaction.
+    pub return_value: Bytes,
+    /// Logs generated during the execution of the transaction.
+    #[serde(default)]
+    pub logs: Vec<Log>,
+    /// The amount of gas used by the transaction.
+    #[serde(with = "alloy_serde::quantity")]
+    pub gas_used: u64,
+    /// The final status of the transaction, typically indicating success or failure.
+    #[serde(with = "alloy_serde::quantity")]
+    pub status: u64,
+    /// Error in case the call failed
+    #[serde(default, skip_serializing_if = "Option::is_none")]
+    pub error: Option<SimulateError>,
+}
+
+/// Simulation options for executing multiple blocks and transactions.
+/// This struct configures how simulations are executed, including whether to trace token transfers,
+/// validate transaction sequences, and whether to return full transaction objects.
+#[derive(Clone, Debug, Serialize, Deserialize)]
+#[serde(rename_all = "camelCase")]
+pub struct SimulatePayload {
+    /// Array of block state calls to be executed at specific, optional block/state.
+    pub block_state_calls: Vec<SimBlock>,
+    /// Flag to determine whether to trace ERC20/ERC721 token transfers within transactions.
+    #[serde(default)]
+    pub trace_transfers: bool,
+    /// Flag to enable or disable validation of the transaction sequence in the blocks.
+    #[serde(default)]
+    pub validation: bool,
+    /// Flag to decide if full transactions should be returned instead of just their hashes.
+    pub return_full_transactions: bool,
+}
+
+/// The error response returned by the `eth_simulateV1` method.
+#[derive(Clone, Debug, Serialize, Deserialize)]
+#[serde(rename_all = "camelCase")]
+pub struct SimulateError {
+    /// Code error
+    /// -3200: Execution reverted
+    /// -32015: VM execution error
+    pub code: i32,
+    /// Message error
+    pub message: String,
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use alloy_primitives::{Address, TxKind};
+    use serde_json::json;
+
+    #[test]
+    fn test_eth_simulate_v1_account_not_precompile() {
+        let request_json = json!({
+            "jsonrpc": "2.0",
+            "id": 1,
+            "method": "eth_simulateV1",
+            "params": [{
+                "blockStateCalls": [
+                    {
+                        "blockOverrides": {},
+                        "stateOverrides": {
+                            "0xc000000000000000000000000000000000000000": {
+                                "nonce": "0x5"
+                            }
+                        },
+                        "calls": []
+                    },
+                    {
+                        "blockOverrides": {},
+                        "stateOverrides": {
+                            "0xc000000000000000000000000000000000000000": {
+                                "code": "0x600035600055"
+                            }
+                        },
+                        "calls": [
+                            {
+                                "from": "0xc000000000000000000000000000000000000000",
+                                "to": "0xc000000000000000000000000000000000000000",
+                                "nonce": "0x0"
+                            },
+                            {
+                                "from": "0xc100000000000000000000000000000000000000",
+                                "to": "0xc100000000000000000000000000000000000000",
+                                "nonce": "0x5"
+                            }
+                        ]
+                    }
+                ],
+                "traceTransfers": false,
+                "validation": true,
+                "returnFullTransactions": false
+            }, "latest"]
+        });
+
+        let sim_opts: SimulatePayload =
+            serde_json::from_value(request_json["params"][0].clone()).unwrap();
+
+        let address_1: Address = "0xc000000000000000000000000000000000000000".parse().unwrap();
+        let address_2: Address = "0xc100000000000000000000000000000000000000".parse().unwrap();
+
+        assert!(sim_opts.validation);
+        assert_eq!(sim_opts.block_state_calls.len(), 2);
+
+        let block_state_call_1 = &sim_opts.block_state_calls[0];
+        assert!(block_state_call_1.state_overrides.contains_key(&address_1));
+        assert_eq!(block_state_call_1.state_overrides.get(&address_1).unwrap().nonce.unwrap(), 5);
+
+        let block_state_call_2 = &sim_opts.block_state_calls[1];
+        assert!(block_state_call_2.state_overrides.contains_key(&address_1));
+
+        assert_eq!(block_state_call_2.calls.len(), 2);
+        assert_eq!(block_state_call_2.calls[0].from.unwrap(), address_1);
+        assert_eq!(block_state_call_2.calls[0].to.unwrap(), TxKind::Call(address_1));
+        assert_eq!(block_state_call_2.calls[0].nonce.unwrap(), 0);
+        assert_eq!(block_state_call_2.calls[1].from.unwrap(), address_2);
+        assert_eq!(block_state_call_2.calls[1].to.unwrap(), TxKind::Call(address_2));
+        assert_eq!(block_state_call_2.calls[1].nonce.unwrap(), 5);
+    }
+}