Added config RPC endpoint

node/tools/src/rpc/methods/config.rs

@@ -0,0 +1,47 @@
+//! Peers method for RPC server.
+use crate::{config::encode_json, decode_json, AppConfig};
+
+use super::RPCMethod;
+use jsonrpsee::types::{error::ErrorCode, Params};
+use std::fs::{self};
+use zksync_protobuf::serde::Serde;
+
+/// Config method for RPC server.
+pub(crate) struct ConfigInfo;
+
+// RPCMethod trait should be more general to allow external parameters like this case
+// TODO fix the trait and implement this code in it
+impl ConfigInfo {
+    pub(crate) fn info(config: AppConfig) -> Result<serde_json::Value, ErrorCode> {
+        // This may change in the future since we are assuming that the executor binary is being run inside the config directory.
+        Ok(serde_json::json!({
+            "config": encode_json(&Serde(config))
+        }))
+    }
+}
+
+impl RPCMethod for ConfigInfo {
+    /// Config response for /config endpoint.
+    fn callback(_params: Params) -> Result<serde_json::Value, ErrorCode> {
+        // This may change in the future since we are assuming that the executor binary is being run inside the config directory.
+        let node_config =
+            fs::read_to_string("config.json").map_err(|_e| ErrorCode::InternalError)?;
+        let node_config = decode_json::<Serde<AppConfig>>(&node_config)
+            .map_err(|_e| ErrorCode::InternalError)?
+            .0;
+        let config = encode_json(&Serde(node_config));
+        Ok(serde_json::json!({
+            "config": config
+        }))
+    }
+
+    /// Config method name.
+    fn method() -> &'static str {
+        "config"
+    }
+
+    /// Method path for GET requests.
+    fn path() -> &'static str {
+        "/config"
+    }
+}