chore: fix linter warnings

.github/workflows/ci.yml

@@ -19,5 +19,8 @@ jobs:
       - name: Build
         run: cargo build
 
+      - name: Lint
+        run: cargo clippy
+
       - name: Run tests
         run: cargo test --verbose

src/api/routes.rs

@@ -88,7 +88,7 @@ pub async fn post_covenant_claim(
         return CovenantClaimResponse::Error(ErrorResponse {
             error: format!(
                 "could not parse blinding key: {}",
-                blinding_key.err().unwrap().to_string()
+                blinding_key.err().unwrap()
             ),
         });
     }
@@ -97,7 +97,7 @@ pub async fn post_covenant_claim(
         Ok(res) => res,
         Err(err) => {
             return CovenantClaimResponse::Error(ErrorResponse {
-                error: format!("could not parse swap tree: {}", err.to_string()),
+                error: format!("could not parse swap tree: {}", err),
             })
         }
     };
@@ -109,15 +109,15 @@ pub async fn post_covenant_claim(
                 Ok(res) => res,
                 Err(err) => {
                     return CovenantClaimResponse::Error(ErrorResponse {
-                        error: format!("could not parse refundPublicKey: {}", err.to_string()),
+                        error: format!("could not parse refundPublicKey: {}", err),
                     })
                 }
             },
             match PublicKey::from_slice(body.claim_public_key.as_ref()) {
                 Ok(res) => res,
                 Err(err) => {
                     return CovenantClaimResponse::Error(ErrorResponse {
-                        error: format!("could not parse claimPublicKey: {}", err.to_string()),
+                        error: format!("could not parse claimPublicKey: {}", err),
                     })
                 }
             },
@@ -126,7 +126,7 @@ pub async fn post_covenant_claim(
     let internal_key = Vec::from(aggregate.agg_pk().serialize());
 
     let preimage_hash: hashes::hash160::Hash = Hash::hash(body.preimage.clone().as_ref());
-    if Vec::from(preimage_hash.as_byte_array()) != covenant_details.preimage_hash {
+    if covenant_details.preimage_hash != *preimage_hash.as_byte_array() {
         return CovenantClaimResponse::Error(ErrorResponse {
             error: "invalid preimage".to_string(),
         });
@@ -145,7 +145,7 @@ pub async fn post_covenant_claim(
                 &body
                     .tree
                     .clone()
-                    .address(internal_key, &state.address_params)
+                    .address(internal_key, state.address_params)
                     .script_pubkey(),
             ),
             tx_id: None,
@@ -170,7 +170,7 @@ fn parse_address(
         Ok(res) => res,
         Err(err) => {
             return Err(ErrorResponse {
-                error: format!("could not parse address: {}", err.to_string()),
+                error: format!("could not parse address: {}", err),
             });
         }
     };

src/api/server.rs

@@ -28,5 +28,5 @@ pub async fn start_server(
         return Err(listener.err().unwrap());
     }
 
-    return Ok(axum::serve(listener.unwrap(), app.clone()).await);
+    Ok(axum::serve(listener.unwrap(), app.clone()).await)
 }

src/boltz/api.rs

@@ -13,7 +13,9 @@ pub struct Client {
 
 impl Client {
     pub fn new(endpoint: String) -> Self {
-        Client { endpoint }
+        Client {
+            endpoint: crate::utils::string::trim_suffix(endpoint, '/'),
+        }
     }
 
     pub async fn send_raw_transaction(&self, hex: String) -> Result<String, Box<dyn Error>> {
@@ -65,6 +67,12 @@ mod client_test {
 
     const ENDPOINT: &str = "https://api.testnet.boltz.exchange/v2";
 
+    #[test]
+    fn test_trim_suffix() {
+        assert_eq!(Client::new(ENDPOINT.to_string() + "/").endpoint, ENDPOINT);
+        assert_eq!(Client::new(ENDPOINT.to_string()).endpoint, ENDPOINT);
+    }
+
     #[tokio::test]
     async fn test_send_raw_transaction_error_handling() {
         let client = Client::new(ENDPOINT.to_string());

src/chain/client.rs

@@ -60,7 +60,7 @@ impl ChainClient {
         };
         trace!("Using Elements endpoint: {}", client.url);
 
-        return client;
+        client
     }
 
     pub async fn connect(mut self) -> Result<ChainClient, Box<dyn Error>> {
@@ -69,11 +69,7 @@ impl ChainClient {
         self.cookie = Some(format!("Basic {}", BASE64_STANDARD.encode(file)));
 
         let notifications = self.clone().get_zmq_notifications().await?;
-
-        match self.zmq_client.clone().connect(notifications).await {
-            Err(e) => return Err(e),
-            _ => {}
-        };
+        self.zmq_client.clone().connect(notifications).await?;
 
         Ok(self)
     }
@@ -143,9 +139,7 @@ impl ChainBackend for ChainClient {
     }
 
     async fn get_block(&self, hash: String) -> Result<Block, Box<dyn Error>> {
-        let mut params = Vec::<StringOrU64>::new();
-        params.push(StringOrU64::Str(hash));
-        params.push(StringOrU64::Num(0));
+        let params = vec![StringOrU64::Str(hash), StringOrU64::Num(0)];
 
         let block_hex = self
             .clone()

src/chain/esplora.rs

@@ -39,40 +39,31 @@ impl EsploraClient {
         max_reqs_per_second: u64,
         boltz_endpoint: String,
     ) -> Result<Self, Box<dyn Error>> {
-        let trimmed_endpoint = match endpoint.strip_suffix("/") {
-            Some(s) => s.to_string(),
-            None => endpoint,
-        };
-
         let (tx_sender, tx_receiver) = crossbeam_channel::bounded::<Transaction>(1);
         let (block_sender, block_receiver) = crossbeam_channel::unbounded::<Block>();
 
-        let rate_limit: Option<Arc<Ratelimiter>>;
-
-        if max_reqs_per_second > 0 {
+        let rate_limit = if max_reqs_per_second > 0 {
             info!(
                 "Rate limiting requests to {} requests/second",
                 max_reqs_per_second
             );
-            rate_limit = Some(Arc::new(
+            Some(Arc::new(
                 Ratelimiter::builder(max_reqs_per_second, Duration::from_secs(1))
                     .max_tokens(max_reqs_per_second)
                     .build()?,
-            ));
+            ))
         } else {
             info!("Not rate limiting");
-            rate_limit = None;
-        }
-
-        let boltz_client: Option<Client>;
+            None
+        };
 
-        if !boltz_endpoint.is_empty() {
+        let boltz_client = if !boltz_endpoint.is_empty() {
             info!("Broadcasting transactions with Boltz API");
-            boltz_client = Some(Client::new(boltz_endpoint));
+            Some(Client::new(boltz_endpoint))
         } else {
             info!("Broadcasting transactions with Esplora");
-            boltz_client = None;
-        }
+            None
+        };
 
         Ok(EsploraClient {
             tx_sender,
@@ -82,7 +73,7 @@ impl EsploraClient {
             boltz_client,
             poll_interval,
             block_receiver,
-            endpoint: trimmed_endpoint,
+            endpoint: crate::utils::string::trim_suffix(endpoint, '/'),
         })
     }
 
@@ -280,11 +271,11 @@ impl ChainBackend for EsploraClient {
     }
 
     fn get_tx_receiver(&self) -> Receiver<Transaction> {
-        return self.tx_receiver.clone();
+        self.tx_receiver.clone()
     }
 
     fn get_block_receiver(&self) -> Receiver<Block> {
-        return self.block_receiver.clone();
+        self.block_receiver.clone()
     }
 }
 

src/chain/zmq.rs

@@ -94,7 +94,7 @@ impl ZmqClient {
         handler: F,
     ) -> Result<(), ZmqError>
     where
-        F: Fn(ZmqMessage) -> () + Send + 'static,
+        F: Fn(ZmqMessage) + Send + 'static,
     {
         debug!(
             "Connecting to {} ZMQ at {}",

src/claimer/constructor.rs

@@ -87,7 +87,6 @@ impl Constructor {
             Ok(_) => {}
             Err(err) => {
                 warn!("Could not schedule covenant claim: {}", err);
-                return;
             }
         };
     }
@@ -106,7 +105,7 @@ impl Constructor {
             }
         };
 
-        if covenants.len() == 0 {
+        if covenants.is_empty() {
             return;
         }
 
@@ -192,7 +191,7 @@ impl Constructor {
         let is_blinded = prevout.asset.is_confidential() && prevout.value.is_confidential();
         let tx_secrets = match is_blinded {
             true => match prevout.unblind(
-                &secp,
+                secp,
                 match SecretKey::from_slice(
                     match covenant.clone().blinding_key {
                         Some(res) => res,
@@ -232,7 +231,7 @@ impl Constructor {
         });
 
         if is_blinded {
-            let mut rng = OsRng::default();
+            let mut rng = OsRng;
 
             let op_return_script = Builder::new()
                 .push_opcode(opcodes::all::OP_RETURN)
@@ -241,13 +240,13 @@ impl Constructor {
             let out_abf = AssetBlindingFactor::new(&mut rng);
             let (blinded_asset, surjection_proof) = Asset::Explicit(utxo_asset).blind(
                 &mut rng,
-                &secp,
+                secp,
                 out_abf,
                 &[tx_secrets.unwrap()],
             )?;
 
             let final_vbf = ValueBlindingFactor::last(
-                &secp,
+                secp,
                 1,
                 out_abf,
                 &[(
@@ -269,9 +268,9 @@ impl Constructor {
                 ],
             );
             let (blinded_value, nonce, rangeproof) = Value::Explicit(1).blind(
-                &secp,
+                secp,
                 final_vbf,
-                SecretKey::new(&mut rng).public_key(&secp),
+                SecretKey::new(&mut rng).public_key(secp),
                 SecretKey::new(&mut rng),
                 &op_return_script.clone(),
                 &elements::RangeProofMessage {

src/claimer/mod.rs

@@ -216,22 +216,21 @@ impl Claimer {
         for vout in 0..tx.output.len() {
             let out = &tx.output[vout];
 
-            match get_pending_covenant_for_output(self.db.clone(), out.script_pubkey.as_bytes()) {
-                Some(covenant) => {
-                    info!(
-                        "Found covenant {} to claim in {}:{}",
-                        hex::encode(covenant.clone().output_script),
-                        tx.txid().to_string(),
-                        vout
-                    );
-
-                    self.clone()
-                        .constructor
-                        .schedule_broadcast(covenant, tx.clone())
-                        .await;
-                }
-                None => {}
-            };
+            if let Some(covenant) =
+                get_pending_covenant_for_output(self.db.clone(), out.script_pubkey.as_bytes())
+            {
+                info!(
+                    "Found covenant {} to claim in {}:{}",
+                    hex::encode(covenant.clone().output_script),
+                    tx.txid().to_string(),
+                    vout
+                );
+
+                self.clone()
+                    .constructor
+                    .schedule_broadcast(covenant, tx.clone())
+                    .await;
+            }
         }
     }
 }

src/claimer/tree.rs

@@ -102,13 +102,10 @@ impl SwapTree {
     ) -> Option<(TxOut, u32)> {
         let script_pubkey = self.address(internal_key, params).script_pubkey();
 
-        let mut vout: u32 = 0;
-        for out in lockup_tx.output {
+        for (vout, out) in (0_u32..).zip(lockup_tx.output.into_iter()) {
             if out.script_pubkey.eq(&script_pubkey) {
                 return Some((out, vout));
             }
-
-            vout += 1;
         }
 
         None

src/db/helpers.rs

@@ -30,7 +30,7 @@ pub fn get_block_height(con: db::Pool) -> Option<u64> {
         .load(&mut con.get().unwrap())
     {
         Ok(res) => {
-            if res.len() == 0 {
+            if res.is_empty() {
                 return None;
             }
 
@@ -89,7 +89,7 @@ pub fn get_pending_covenant_for_output(con: db::Pool, script: &[u8]) -> Option<P
         .load(&mut con.get().unwrap())
     {
         Ok(res) => {
-            if res.len() == 0 {
+            if res.is_empty() {
                 return None;
             }
 

src/db/models.rs

@@ -1,6 +1,7 @@
 use diesel::internal::derives::multiconnection::chrono;
 use diesel::prelude::*;
 
+#[derive(Copy, Clone)]
 pub enum PendingCovenantStatus {
     Pending = 0,
     TransactionFound = 1,

src/main.rs

@@ -12,6 +12,7 @@ mod boltz;
 mod chain;
 mod claimer;
 mod db;
+mod utils;
 
 pub mod built_info {
     include!(concat!(env!("OUT_DIR"), "/built.rs"));
@@ -139,7 +140,7 @@ async fn get_chain_backend() -> Arc<Box<dyn ChainBackend + Send + Sync>> {
         }
     };
 
-    return Arc::new(client);
+    Arc::new(client)
 }
 
 fn get_address_params() -> &'static AddressParams {

src/utils/mod.rs

@@ -0,0 +1 @@
+pub mod string;

src/utils/string.rs

@@ -0,0 +1,6 @@
+pub fn trim_suffix(string: String, suffix: char) -> String {
+    match string.strip_suffix(suffix) {
+        Some(s) => s.to_string(),
+        None => string,
+    }
+}