feat: debug_traceCall (#1949)

* feat: debug_traceCall

* chore: update changelog

* fix: rebase to master and change tracer from string to enum

CHANGELOG.md

@@ -4,8 +4,8 @@
 
 ### Unreleased
 
--
 - Fix typo in `RwClient` docs for `write_client` method.
+- Add support for Geth `debug_traceCall` [#1949](https://github.com/gakonst/ethers-rs/pull/1949)
 - Graceful handling of WebSocket transport errors [#1889](https://github.com/gakonst/ethers-rs/issues/1889) [#1815](https://github.com/gakonst/ethers-rs/issues/1815)
 - `MiddlewareBuilder` trait to instantiate a `Provider` as `Middleware` layers.
 - An `Event` builder can be instantiated specifying the event filter type, without the need to instantiate a contract.

ethers-core/src/types/trace/geth.rs

@@ -1,4 +1,7 @@
-use crate::types::{Bytes, H256, U256};
+use crate::{
+    types::{Bytes, H256, U256},
+    utils::from_int_or_hex,
+};
 use serde::{Deserialize, Serialize, Serializer};
 use std::collections::BTreeMap;
 
@@ -6,7 +9,8 @@ use std::collections::BTreeMap;
 #[derive(Debug, Clone, Default, PartialEq, Eq, Serialize, Deserialize)]
 pub struct GethTrace {
     pub failed: bool,
-    pub gas: u64,
+    #[serde(deserialize_with = "from_int_or_hex")]
+    pub gas: U256,
     #[serde(serialize_with = "serialize_bytes", rename = "returnValue")]
     pub return_value: Bytes,
     #[serde(rename = "structLogs")]
@@ -35,6 +39,16 @@ pub struct StructLog {
     pub storage: Option<BTreeMap<H256, H256>>,
 }
 
+#[derive(Debug, PartialEq, Eq, Clone, Deserialize, Serialize)]
+/// Available built-in tracers
+///
+/// See <https://geth.ethereum.org/docs/developers/evm-tracing/built-in-tracers>
+pub enum GethDebugTracerType {
+    /// callTracer (native)
+    #[serde(rename = "callTracer")]
+    CallTracer,
+}
+
 /// Bindings for additional `debug_traceTransaction` options
 ///
 /// See <https://geth.ethereum.org/docs/rpc/ns-debug#debug_tracetransaction>
@@ -50,11 +64,22 @@ pub struct GethDebugTracingOptions {
     #[serde(default, skip_serializing_if = "Option::is_none")]
     pub enable_return_data: Option<bool>,
     #[serde(default, skip_serializing_if = "Option::is_none")]
-    pub tracer: Option<String>,
+    pub tracer: Option<GethDebugTracerType>,
     #[serde(default, skip_serializing_if = "Option::is_none")]
     pub timeout: Option<String>,
 }
 
+/// Bindings for additional `debug_traceCall` options
+///
+/// See <https://geth.ethereum.org/docs/rpc/ns-debug#debug_tracecall>
+#[derive(Clone, Debug, PartialEq, Eq, Serialize, Deserialize, Default)]
+#[serde(rename_all = "camelCase")]
+pub struct GethDebugTracingCallOptions {
+    #[serde(flatten)]
+    pub tracing_options: GethDebugTracingOptions,
+    // TODO: Add stateoverrides and blockoverrides options
+}
+
 fn serialize_bytes<S, T>(x: T, s: S) -> Result<S::Ok, S::Error>
 where
     S: Serializer,

ethers-middleware/Cargo.toml

@@ -31,7 +31,7 @@ tracing = { version = "0.1.37", default-features = false }
 tracing-futures = { version = "0.2.5", default-features = false }
 
 # for gas oracles
-reqwest = { version = "0.11.13", default-features = false, features = ["json"] }
+reqwest = { version = "0.11.13", default-features = false, features = ["json", "rustls-tls"] }
 url = { version = "2.3.1", default-features = false }
 
 serde_json = { version = "1.0.64", default-features = false }

ethers-providers/src/lib.rs

@@ -540,6 +540,7 @@ pub trait Middleware: Sync + Send + Debug {
     }
 
     // Geth `trace` support
+
     /// After replaying any previous transactions in the same block,
     /// Replays a transaction, returning the traces configured with passed options
     async fn debug_trace_transaction(
@@ -550,6 +551,16 @@ pub trait Middleware: Sync + Send + Debug {
         self.inner().debug_trace_transaction(tx_hash, trace_options).await.map_err(FromErr::from)
     }
 
+    /// Executes the given call and returns a number of possible traces for it
+    async fn debug_trace_call<T: Into<TypedTransaction> + Send + Sync>(
+        &self,
+        req: T,
+        block: Option<BlockId>,
+        trace_options: GethDebugTracingCallOptions,
+    ) -> Result<GethTrace, ProviderError> {
+        self.inner().debug_trace_call(req, block, trace_options).await.map_err(FromErr::from)
+    }
+
     // Parity `trace` support
 
     /// Executes the given call and returns a number of possible traces for it

ethers-providers/src/provider.rs

@@ -22,9 +22,10 @@ use ethers_core::{
     types::{
         transaction::{eip2718::TypedTransaction, eip2930::AccessListWithGasUsed},
         Address, Block, BlockId, BlockNumber, BlockTrace, Bytes, EIP1186ProofResponse, FeeHistory,
-        Filter, FilterBlockOption, GethDebugTracingOptions, GethTrace, Log, NameOrAddress,
-        Selector, Signature, Trace, TraceFilter, TraceType, Transaction, TransactionReceipt,
-        TransactionRequest, TxHash, TxpoolContent, TxpoolInspect, TxpoolStatus, H256, U256, U64,
+        Filter, FilterBlockOption, GethDebugTracingCallOptions, GethDebugTracingOptions, GethTrace,
+        Log, NameOrAddress, Selector, Signature, Trace, TraceFilter, TraceType, Transaction,
+        TransactionReceipt, TransactionRequest, TxHash, TxpoolContent, TxpoolInspect, TxpoolStatus,
+        H256, U256, U64,
     },
     utils,
 };
@@ -1048,6 +1049,20 @@ impl<P: JsonRpcClient> Middleware for Provider<P> {
         self.request("debug_traceTransaction", [tx_hash, trace_options]).await
     }
 
+    /// Executes the given call and returns a number of possible traces for it
+    async fn debug_trace_call<T: Into<TypedTransaction> + Send + Sync>(
+        &self,
+        req: T,
+        block: Option<BlockId>,
+        trace_options: GethDebugTracingCallOptions,
+    ) -> Result<GethTrace, ProviderError> {
+        let req = req.into();
+        let req = utils::serialize(&req);
+        let block = utils::serialize(&block.unwrap_or_else(|| BlockNumber::Latest.into()));
+        let trace_options = utils::serialize(&trace_options);
+        self.request("debug_traceCall", [req, block, trace_options]).await
+    }
+
     /// Executes the given call and returns a number of possible traces for it
     async fn trace_call<T: Into<TypedTransaction> + Send + Sync>(
         &self,

examples/geth_trace_call.rs

@@ -0,0 +1,26 @@
+use ethers::prelude::*;
+use eyre::Result;
+use std::str::FromStr;
+
+/// use `debug_traceCall` to fetch traces
+/// requires, a valid endpoint in `RPC_URL` env var that supports `debug_traceCall`
+#[tokio::main]
+async fn main() -> Result<()> {
+    if let Ok(url) = std::env::var("RPC_URL") {
+        let client = Provider::<Http>::try_from(url)?;
+        let tx = TransactionRequest::new().from(Address::from_str("0xdeadbeef29292929192939494959594933929292").unwrap()).to(Address::from_str("0xde929f939d939d393f939393f93939f393929023").unwrap()).gas("0x7a120").data(Bytes::from_str("0xf00d4b5d00000000000000000000000001291230982139282304923482304912923823920000000000000000000000001293123098123928310239129839291010293810").unwrap());
+        let block = BlockId::from(16213100);
+        let options: GethDebugTracingCallOptions = GethDebugTracingCallOptions {
+            tracing_options: GethDebugTracingOptions {
+                disable_storage: Some(true),
+                enable_memory: Some(false),
+                tracer: Some(GethDebugTracerType::CallTracer),
+                ..Default::default()
+            },
+        };
+        let traces = client.debug_trace_call(tx, Some(block), options).await?;
+        println!("{traces:?}");
+    }
+
+    Ok(())
+}