feat(common): add a route /info for operator public key

Author: hopeyen

common/src/address.rs

@@ -0,0 +1,21 @@
+// Copyright 2023-, GraphOps and Semiotic Labs.
+// SPDX-License-Identifier: Apache-2.0
+
+use ethers::signers::{
+    coins_bip39::English, LocalWallet, MnemonicBuilder, Signer, Wallet, WalletError,
+};
+use ethers_core::k256::ecdsa::SigningKey;
+
+/// Build Wallet from Private key or Mnemonic
+pub fn build_wallet(value: &str) -> Result<Wallet<SigningKey>, WalletError> {
+    value
+        .parse::<LocalWallet>()
+        .or(MnemonicBuilder::<English>::default().phrase(value).build())
+}
+
+// Format public key to a String
+pub fn public_key(value: &str) -> Result<String, WalletError> {
+    let wallet = build_wallet(value)?;
+    let addr = format!("{:?}", wallet.address());
+    Ok(addr)
+}

common/src/indexer_service/http/indexer_service.rs

@@ -31,6 +31,7 @@ use tower_governor::{errors::display_error, governor::GovernorConfigBuilder, Gov
 use tracing::info;
 
 use crate::{
+    address::public_key,
     indexer_service::http::{
         metrics::IndexerServiceMetrics, static_subgraph::static_subgraph_request_handler,
     },
@@ -312,9 +313,12 @@ impl IndexerService {
             )),
         };
 
+        let operator_address = public_key(&options.config.indexer.operator_mnemonic)?;
+
         let mut misc_routes = Router::new()
             .route("/", get("Service is up and running"))
             .route("/version", get(Json(options.release)))
+            .route("/info", get(Json(operator_address)))
             .layer(
                 ServiceBuilder::new()
                     .layer(HandleErrorLayer::new(|e: BoxError| async move {

common/src/lib.rs

@@ -1,6 +1,7 @@
 // Copyright 2023-, GraphOps and Semiotic Labs.
 // SPDX-License-Identifier: Apache-2.0
 
+pub mod address;
 pub mod allocations;
 pub mod attestations;
 pub mod escrow_accounts;