feat: add ClientVersionV1 (#562)

* added ClientVersionV1

* touchups

* rustfmt

---------

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

crates/rpc-types-engine/src/identification.rs

@@ -0,0 +1,129 @@
+//! Client identification: <https://github.com/ethereum/execution-apis/blob/main/src/engine/identification.md>
+
+use serde::{Deserialize, Serialize};
+use std::str::FromStr;
+
+/// This enum defines a standard for specifying a client with just two letters. Clients teams which
+/// have a code reserved in this list MUST use this code when identifying themselves.
+#[derive(Clone, Copy, Debug, PartialEq, Eq, Serialize, Deserialize)]
+pub enum ClientCode {
+    /// Besu
+    BU,
+    /// EthereumJS
+    EJ,
+    /// Erigon
+    EG,
+    /// Geth, go-ethereum
+    GE,
+    /// Grandine
+    GR,
+    /// Lighthouse
+    LH,
+    /// Lodestar
+    LS,
+    /// Nethermind
+    NM,
+    /// Nimbus
+    NB,
+    /// Teku
+    TK,
+    /// Prysm
+    PM,
+    /// Reth
+    RH,
+}
+
+impl ClientCode {
+    /// Returns the client identifier as str.
+    pub const fn as_str(&self) -> &'static str {
+        match self {
+            ClientCode::BU => "BU",
+            ClientCode::EJ => "EJ",
+            ClientCode::EG => "EG",
+            ClientCode::GE => "GE",
+            ClientCode::GR => "GR",
+            ClientCode::LH => "LH",
+            ClientCode::LS => "LS",
+            ClientCode::NM => "NM",
+            ClientCode::NB => "NB",
+            ClientCode::TK => "TK",
+            ClientCode::PM => "PM",
+            ClientCode::RH => "RH",
+        }
+    }
+
+    /// Returns the human readable client name for the given code.
+    pub const fn client_name(&self) -> &'static str {
+        match self {
+            ClientCode::BU => "Besu",
+            ClientCode::EJ => "EthereumJS",
+            ClientCode::EG => "Erigon",
+            ClientCode::GE => "Geth",
+            ClientCode::GR => "Grandine",
+            ClientCode::LH => "Lighthouse",
+            ClientCode::LS => "Lodestar",
+            ClientCode::NM => "Nethermind",
+            ClientCode::NB => "Nimbus",
+            ClientCode::TK => "Teku",
+            ClientCode::PM => "Prysm",
+            ClientCode::RH => "Reth",
+        }
+    }
+}
+
+impl FromStr for ClientCode {
+    type Err = String;
+
+    fn from_str(s: &str) -> Result<Self, Self::Err> {
+        match s {
+            "BU" => Ok(ClientCode::BU),
+            "EJ" => Ok(ClientCode::EJ),
+            "EG" => Ok(ClientCode::EG),
+            "GE" => Ok(ClientCode::GE),
+            "GR" => Ok(ClientCode::GR),
+            "LH" => Ok(ClientCode::LH),
+            "LS" => Ok(ClientCode::LS),
+            "NM" => Ok(ClientCode::NM),
+            "NB" => Ok(ClientCode::NB),
+            "TK" => Ok(ClientCode::TK),
+            "PM" => Ok(ClientCode::PM),
+            "RH" => Ok(ClientCode::RH),
+            s => Err(s.to_string()),
+        }
+    }
+}
+
+impl std::fmt::Display for ClientCode {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        write!(f, "{}", self.as_str())
+    }
+}
+
+/// Contains information which identifies a client implementation.
+#[derive(Clone, Debug, PartialEq, Eq, Serialize, Deserialize)]
+#[serde(rename_all = "camelCase")]
+pub struct ClientVersionV1 {
+    /// Client code, e.g. GE for Geth
+    pub code: ClientCode,
+    /// Human-readable name of the client, e.g. Lighthouse or go-ethereum
+    pub name: String,
+    /// The version string of the current implementation e.g. v4.6.0 or 1.0.0-alpha.1 or
+    /// 1.0.0+20130313144700
+    pub version: String,
+    /// first four bytes of the latest commit hash of this build e.g: `fa4ff922`
+    pub commit: String,
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn client_id_serde() {
+        let s = r#"{"code":"RH","name":"Reth","version":"v1.10.8","commit":"fa4ff922"}"#;
+        let v: ClientVersionV1 = serde_json::from_str(s).unwrap();
+        assert_eq!(v.code, ClientCode::RH);
+        assert_eq!(v.name, "Reth");
+        assert_eq!(serde_json::to_string(&v).unwrap(), s);
+    }
+}

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

@@ -23,11 +23,14 @@
 mod cancun;
 mod exit;
 mod forkchoice;
+mod identification;
 mod optimism;
 pub mod payload;
 mod transition;
 
-pub use self::{cancun::*, exit::*, forkchoice::*, optimism::*, payload::*, transition::*};
+pub use self::{
+    cancun::*, exit::*, forkchoice::*, identification::*, optimism::*, payload::*, transition::*,
+};
 
 #[doc(inline)]
 pub use alloy_eips::eip6110::Deposit;