feat: allow unset blocklist clients

signer/src/blocklist_client.rs

@@ -41,19 +41,15 @@ impl BlocklistChecker for BlocklistClient {
 
 impl BlocklistClient {
     /// Construct a new [`BlocklistClient`]
-    pub fn new(ctx: &impl Context) -> Self {
-        let base_url = format!(
-            "http://{}:{}",
-            ctx.config().blocklist_client.host,
-            ctx.config().blocklist_client.port
-        );
+    pub fn new(ctx: &impl Context) -> Option<Self> {
+        let config = ctx.config().blocklist_client.as_ref()?;
 
         let config = Configuration {
-            base_path: base_url.clone(),
+            base_path: config.endpoint.to_string(),
             ..Default::default()
         };
 
-        BlocklistClient { config }
+        Some(BlocklistClient { config })
     }
 
     #[cfg(test)]

signer/src/config/default.toml

@@ -3,9 +3,15 @@
 # !! ==============================================================================
 # !! Blocklist Client Configuration
 # !! ==============================================================================
-[blocklist_client]
-host = "127.0.0.1"
-port = 8080
+# You may specify a blocklist client url. If one is not specified, then
+# deposit or withdrawal requests are always accepted.
+#
+# Format: "http(s)://<host>:<port>"
+# Default: <none>
+# Required: false
+# Environment: SIGNER_BLOCKLIST_CLIENT__ENDPOINT
+# [blocklist_client]
+# endpoint = "http://127.0.0.1:8080"
 
 # !! ==============================================================================
 # !! Emily API Configuration

signer/src/config/mod.rs

@@ -1,17 +1,21 @@
 //! Configuration management for the signer
-use config::{Config, ConfigError, Environment, File};
+use config::Config;
+use config::ConfigError;
+use config::Environment;
+use config::File;
 use libp2p::Multiaddr;
 use serde::Deserialize;
 use stacks_common::types::chainstate::StacksAddress;
 use std::path::Path;
 use url::Url;
 
+use crate::config::error::SignerConfigError;
+use crate::config::serialization::p2p_multiaddr_deserializer_vec;
+use crate::config::serialization::parse_stacks_address;
+use crate::config::serialization::private_key_deserializer;
+use crate::config::serialization::url_deserializer_single;
+use crate::config::serialization::url_deserializer_vec;
 use crate::keys::PrivateKey;
-use error::SignerConfigError;
-use serialization::{
-    p2p_multiaddr_deserializer_vec, parse_stacks_address, private_key_deserializer,
-    url_deserializer_single, url_deserializer_vec,
-};
 
 mod error;
 mod serialization;
@@ -76,7 +80,7 @@ impl NetworkKind {
 #[derive(Deserialize, Clone, Debug)]
 pub struct Settings {
     /// Blocklist client specific config
-    pub blocklist_client: BlocklistClientConfig,
+    pub blocklist_client: Option<BlocklistClientConfig>,
     /// Electrum notifier specific config
     pub block_notifier: BlockNotifierConfig,
     /// Signer-specific configuration
@@ -137,27 +141,9 @@ impl Validatable for P2PNetworkConfig {
 /// Blocklist client specific config
 #[derive(Deserialize, Clone, Debug)]
 pub struct BlocklistClientConfig {
-    /// Host of the blocklist client
-    pub host: String,
-    /// Port of the blocklist client
-    pub port: u16,
-}
-
-impl Validatable for BlocklistClientConfig {
-    fn validate(&self, _: &Settings) -> Result<(), ConfigError> {
-        if self.host.is_empty() {
-            return Err(ConfigError::Message(
-                "[blocklist_client] Host cannot be empty".to_string(),
-            ));
-        }
-        if !(1..=65535).contains(&self.port) {
-            return Err(ConfigError::Message(
-                "[blocklist_client] Port must be between 1 and 65535".to_string(),
-            ));
-        }
-
-        Ok(())
-    }
+    /// the url for the blocklist client
+    #[serde(deserialize_with = "url_deserializer_single")]
+    pub endpoint: Url,
 }
 
 /// Emily API configuration.
@@ -328,7 +314,6 @@ impl Settings {
 
     /// Perform validation on the configuration.
     fn validate(&self) -> Result<(), ConfigError> {
-        self.blocklist_client.validate(self)?;
         self.block_notifier.validate(self)?;
         self.signer.validate(self)?;
 
@@ -367,9 +352,10 @@ impl Validatable for StacksConfig {
 
 #[cfg(test)]
 mod tests {
-    use std::{net::SocketAddr, str::FromStr};
+    use std::net::SocketAddr;
+    use std::str::FromStr;
 
-    use serialization::try_parse_p2p_multiaddr;
+    use crate::config::serialization::try_parse_p2p_multiaddr;
 
     use crate::error::Error;
     use crate::testing::clear_env;
@@ -396,8 +382,7 @@ mod tests {
         clear_env();
 
         let settings = Settings::new_from_default_config().unwrap();
-        assert_eq!(settings.blocklist_client.host, "127.0.0.1");
-        assert_eq!(settings.blocklist_client.port, 8080);
+        assert!(settings.blocklist_client.is_none());
 
         assert_eq!(settings.block_notifier.server, "tcp://localhost:60401");
         assert_eq!(settings.block_notifier.retry_interval, 10);
@@ -577,6 +562,18 @@ mod tests {
         assert_eq!(settings.stacks.endpoints[0].port(), Some(9101));
     }
 
+    #[test]
+    fn blocklist_client_endpoint() {
+        clear_env();
+
+        let endpoint = "http://127.0.0.1:12345";
+        std::env::set_var("SIGNER_BLOCKLIST_CLIENT__ENDPOINT", endpoint);
+        let settings = Settings::new_from_default_config().unwrap();
+
+        let actual_endpoint = settings.blocklist_client.unwrap().endpoint;
+        assert_eq!(actual_endpoint, url::Url::parse(endpoint).unwrap());
+    }
+
     #[test]
     fn invalid_private_key_length_returns_correct_error() {
         clear_env();
@@ -630,7 +627,6 @@ mod tests {
         let hex_err = hex::decode("zz").unwrap_err();
 
         let settings = Settings::new_from_default_config();
-        assert!(settings.is_err());
         assert!(matches!(
             settings.unwrap_err(),
             ConfigError::Message(msg) if msg == Error::DecodeHexBytes(hex_err).to_string()

signer/src/main.rs

@@ -78,6 +78,7 @@ async fn main() -> Result<(), Box<dyn std::error::Error>> {
         // Our global termination signal watcher. This does not run using `run_checked`
         // as it sends its own shutdown signal.
         run_shutdown_signal_watcher(context.clone()),
+        run_checked(run_block_observer, &context),
         // The rest of our services which run concurrently, and must all be
         // running for the signer to be operational.
         run_checked(run_stacks_event_observer, &context),

signer/src/testing/transaction_signer.rs

@@ -36,7 +36,7 @@ struct EventLoopHarness<S, Rng> {
 impl<S, Rng> EventLoopHarness<S, Rng>
 where
     S: storage::DbRead + storage::DbWrite + Clone + Send + Sync + 'static,
-    Rng: rand::RngCore + rand::CryptoRng + Send + 'static,
+    Rng: rand::RngCore + rand::CryptoRng + Send + Sync + 'static,
 {
     fn create(
         network: network::in_memory::MpmcBroadcaster,
@@ -46,7 +46,6 @@ where
         threshold: u32,
         rng: Rng,
     ) -> Self {
-        let blocklist_checker = ();
         let (block_observer_notification_tx, block_observer_notifications) =
             tokio::sync::watch::channel(());
 
@@ -56,7 +55,7 @@ where
             event_loop: transaction_signer::TxSignerEventLoop {
                 storage: storage.clone(),
                 network,
-                blocklist_checker,
+                blocklist_checker: Some(()),
                 block_observer_notifications,
                 signer_private_key,
                 context_window,

signer/src/transaction_signer.rs

@@ -106,7 +106,7 @@ pub struct TxSignerEventLoop<Network, Storage, BlocklistChecker, Rng> {
     /// Database connection.
     pub storage: Storage,
     /// Blocklist checker.
-    pub blocklist_checker: BlocklistChecker,
+    pub blocklist_checker: Option<BlocklistChecker>,
     /// Notification receiver from the block observer.
     pub block_observer_notifications: tokio::sync::watch::Receiver<()>,
     /// Private key of the signer for network communication.
@@ -599,12 +599,7 @@ where
             .collect::<Result<Vec<bitcoin::Address>, _>>()?;
 
         let is_accepted = futures::stream::iter(&addresses)
-            .any(|address| async {
-                self.blocklist_checker
-                    .can_accept(&address.to_string())
-                    .await
-                    .unwrap_or(false)
-            })
+            .any(|address| async { self.check_blocklist(&address.to_string()).await })
             .await;
 
         let msg = message::SignerDepositDecision {
@@ -637,10 +632,8 @@ where
         // TODO: Do we want to do this on the sender address of the
         // recipient address?
         let is_accepted = self
-            .blocklist_checker
-            .can_accept(&withdraw_request.sender_address.to_string())
-            .await
-            .unwrap_or(false);
+            .check_blocklist(&withdraw_request.sender_address.to_string())
+            .await;
 
         let signer_decision = model::WithdrawalSigner {
             request_id: withdraw_request.request_id,
@@ -657,6 +650,14 @@ where
         Ok(())
     }
 
+    async fn check_blocklist(&self, address: &str) -> bool {
+        let Some(client) = self.blocklist_checker.as_ref() else {
+            return true;
+        };
+
+        client.can_accept(address).await.unwrap_or(false)
+    }
+
     #[tracing::instrument(skip(self))]
     async fn persist_received_deposit_decision(
         &mut self,

signer/tests/integration/bitcoin_client.rs

@@ -9,6 +9,7 @@ use signer::bitcoin::BitcoinInteract;
 use signer::util::ApiFallbackClient;
 use url::Url;
 
+#[cfg_attr(not(feature = "integration-tests"), ignore)]
 #[tokio::test]
 async fn test_get_block_not_found() {
     let url: Url = "http://devnet:devnet@localhost:18443".parse().unwrap();
@@ -26,6 +27,7 @@ async fn test_get_block_not_found() {
 // TODO: Figure out how to let this (and similar tests) run against the wallet
 // generated by `initialize_blockchain()`. See comment in the test below.
 //#[ignore = "This test needs to be run against a 'fresh' bitcoin core instance"]
+#[cfg_attr(not(feature = "integration-tests"), ignore)]
 #[tokio::test]
 async fn test_get_block_works() {
     let (_, faucet) = regtest::initialize_blockchain();