adds SignetEthBundle type

This change copies over the SignetEthBundle type from signet-types.
This colocation allows other crates depending on this one to craft
bundles without depending on signet-node.

- copies SignetEthBundle type from signet-node into the bundle module
- exposes bundle module for external use

Author: dylanlott

Cargo.toml

@@ -11,17 +11,14 @@ repository = "https://github.com/init4tech/zenith"
 license = "AGPL-3.0"
 
 [dependencies]
+alloy = { version = "0.9", features = ["full", "json-rpc", "signer-aws", "rpc-types-mev"] }
 alloy-primitives = { version = "0.8.11", features = ["serde", "tiny-keccak"] }
 alloy-sol-types = { version = "0.8.11", features = ["json"] }
-
 alloy-rlp = { version = "0.3.4" }
-
-alloy = { version = "=0.7.3", features = ["full", "json-rpc", "signer-aws"] }
 alloy-contract = { version = "=0.7.3", features = ["pubsub"] }
 
 serde = { version = "1.0.197", features = ["derive"] }
 
 [dev-dependencies]
 serde_json = "1.0.94"
 tokio = { version = "1.37.0", features = ["macros"] }
-

src/bundle.rs

@@ -0,0 +1,17 @@
+use alloy::rpc::types::mev::EthSendBundle;
+use serde::{Deserialize, Serialize};
+
+use crate::SignedOrder;
+
+/// Wraps a flashbots style EthSendBundle with host fills to make a Signet compatible bundle
+#[derive(Debug, Clone, PartialEq, Eq, Serialize, Deserialize)]
+#[serde(rename_all = "camelCase")]
+pub struct SignetEthBundle {
+    /// The bundle of transactions to simulate. Same structure as a Flashbots [EthSendBundle] bundle.
+    /// see <https://github.com/alloy-rs/alloy/blob/main/crates/rpc-types-mev/src/eth_calls.rs#L121-L139>
+    #[serde(flatten)]
+    pub bundle: EthSendBundle,
+    /// Host fills to be applied with the bundle, represented as a signed permit2 order.
+    /// TODO: Link to docs
+    pub host_fills: Option<SignedOrder>,
+}

src/lib.rs

@@ -22,6 +22,9 @@ pub use block::{decode_txns, encode_txns, Alloy2718Coder, Coder, ZenithBlock, Ze
 mod orders;
 pub use orders::{AggregateOrders, SignedOrder};
 
+mod bundle;
+pub use bundle::SignetEthBundle;
+
 mod req;
 pub use req::SignRequest;