chore: Fix clippy lints

tower-fallback/tests/fallback.rs

@@ -1,3 +1,5 @@
+//! Tests for tower-fallback
+
 use tower::{service_fn, Service, ServiceExt};
 use tower_fallback::Fallback;
 

zebra-chain/src/chain_tip.rs

@@ -139,7 +139,7 @@ impl<'f> BestTipChanged<'f> {
     }
 }
 
-impl<'f> Future for BestTipChanged<'f> {
+impl Future for BestTipChanged<'_> {
     type Output = Result<(), BoxError>;
 
     fn poll(

zebra-chain/src/orchard/shielded_data.rs

@@ -270,6 +270,6 @@ impl ZcashDeserialize for Flags {
         // the reserved bits 2..7 of the flagsOrchard field MUST be zero."
         // https://zips.z.cash/protocol/protocol.pdf#txnencodingandconsensus
         Flags::from_bits(reader.read_u8()?)
-            .ok_or_else(|| SerializationError::Parse("invalid reserved orchard flags"))
+            .ok_or(SerializationError::Parse("invalid reserved orchard flags"))
     }
 }

zebra-chain/src/serialization/tests.rs

@@ -1,2 +1,4 @@
+//! Serialization tests.
+
 mod preallocate;
 mod prop;

zebra-chain/src/transaction.rs

@@ -231,7 +231,7 @@ impl Transaction {
         &'a self,
         branch_id: ConsensusBranchId,
         all_previous_outputs: &'a [transparent::Output],
-    ) -> sighash::SigHasher {
+    ) -> sighash::SigHasher<'a> {
         sighash::SigHasher::new(self, branch_id, all_previous_outputs)
     }
 

zebra-chain/src/transaction/serialize.rs

@@ -889,7 +889,7 @@ impl ZcashDeserialize for Transaction {
                 // Convert it to a NetworkUpgrade
                 let network_upgrade =
                     NetworkUpgrade::from_branch_id(limited_reader.read_u32::<LittleEndian>()?)
-                        .ok_or_else(|| {
+                        .ok_or({
                             SerializationError::Parse(
                                 "expected a valid network upgrade from the consensus branch id",
                             )

zebra-network/src/protocol/external/codec.rs

@@ -508,7 +508,9 @@ impl Codec {
             timestamp: Utc
                 .timestamp_opt(reader.read_i64::<LittleEndian>()?, 0)
                 .single()
-                .ok_or_else(|| Error::Parse("version timestamp is out of range for DateTime"))?,
+                .ok_or(Error::Parse(
+                    "version timestamp is out of range for DateTime",
+                ))?,
             address_recv: AddrInVersion::zcash_deserialize(&mut reader)?,
             address_from: AddrInVersion::zcash_deserialize(&mut reader)?,
             nonce: Nonce(reader.read_u64::<LittleEndian>()?),

zebra-scan/src/service.rs

@@ -93,18 +93,18 @@ impl Service<Request> for ScanService {
             Request::Info => {
                 let db = self.db.clone();
 
-                return async move {
+                async move {
                     Ok(Response::Info {
                         min_sapling_birthday_height: db.network().sapling_activation_height(),
                     })
                 }
-                .boxed();
+                .boxed()
             }
 
             Request::RegisterKeys(keys) => {
                 let mut scan_task = self.scan_task.clone();
 
-                return async move {
+                async move {
                     let newly_registered_keys = scan_task.register_keys(keys)?.await?;
                     if !newly_registered_keys.is_empty() {
                         Ok(Response::RegisteredKeys(newly_registered_keys))
@@ -113,14 +113,14 @@ impl Service<Request> for ScanService {
                         are valid Sapling extended full viewing keys".into())
                     }
                 }
-                .boxed();
+                .boxed()
             }
 
             Request::DeleteKeys(keys) => {
                 let mut db = self.db.clone();
                 let mut scan_task = self.scan_task.clone();
 
-                return async move {
+                async move {
                     // Wait for a message to confirm that the scan task has removed the key up to `DELETE_KEY_TIMEOUT`
                     let remove_keys_result = tokio::time::timeout(
                         DELETE_KEY_TIMEOUT,
@@ -141,13 +141,13 @@ impl Service<Request> for ScanService {
 
                     Ok(Response::DeletedKeys)
                 }
-                .boxed();
+                .boxed()
             }
 
             Request::Results(keys) => {
                 let db = self.db.clone();
 
-                return async move {
+                async move {
                     let mut final_result = BTreeMap::new();
                     for key in keys {
                         let db = db.clone();
@@ -168,26 +168,26 @@ impl Service<Request> for ScanService {
 
                     Ok(Response::Results(final_result))
                 }
-                .boxed();
+                .boxed()
             }
 
             Request::SubscribeResults(keys) => {
                 let mut scan_task = self.scan_task.clone();
 
-                return async move {
+                async move {
                     let results_receiver = scan_task.subscribe(keys)?.await.map_err(|_| {
                         "scan task dropped responder, check that keys are registered"
                     })?;
 
                     Ok(Response::SubscribeResults(results_receiver))
                 }
-                .boxed();
+                .boxed()
             }
 
             Request::ClearResults(keys) => {
                 let mut db = self.db.clone();
 
-                return async move {
+                async move {
                     // Clear results from db for the provided `keys`
                     tokio::task::spawn_blocking(move || {
                         db.delete_sapling_results(keys);
@@ -196,7 +196,7 @@ impl Service<Request> for ScanService {
 
                     Ok(Response::ClearedResults)
                 }
-                .boxed();
+                .boxed()
             }
         }
     }

zebra-scan/src/storage/db/sapling.rs

@@ -265,7 +265,7 @@ trait InsertSaplingHeight {
     fn insert_sapling_height(self, sapling_key: &SaplingScanningKey, height: Height) -> Self;
 }
 
-impl<'cf> InsertSaplingHeight for WriteSaplingTxIdsBatch<'cf> {
+impl InsertSaplingHeight for WriteSaplingTxIdsBatch<'_> {
     /// Insert sapling height with no results.
     ///
     /// If a result already exists for the coinbase transaction at that height,
@@ -283,7 +283,7 @@ trait DeleteSaplingKeys {
     fn delete_sapling_keys(self, sapling_key: Vec<SaplingScanningKey>) -> Self;
 }
 
-impl<'cf> DeleteSaplingKeys for WriteSaplingTxIdsBatch<'cf> {
+impl DeleteSaplingKeys for WriteSaplingTxIdsBatch<'_> {
     /// Delete sapling keys and their results.
     fn delete_sapling_keys(mut self, sapling_keys: Vec<SaplingScanningKey>) -> Self {
         for key in &sapling_keys {

zebra-scan/tests/scan_task_commands.rs

@@ -5,7 +5,7 @@
 //!
 //! export ZEBRA_CACHED_STATE_DIR="/path/to/zebra/state"
 //! cargo test scan_task_commands --features="shielded-scan" -- --ignored --nocapture
-#![allow(dead_code)]
+#![allow(dead_code, non_local_definitions)]
 
 use std::{fs, time::Duration};
 
@@ -26,6 +26,7 @@ use zebra_scan::{
 
 use zebra_state::{ChainTipChange, LatestChainTip};
 
+/// Boxed state service.
 pub type BoxStateService =
     BoxService<zebra_state::Request, zebra_state::Response, zebra_state::BoxError>;
 
@@ -162,6 +163,7 @@ pub(crate) async fn run() -> Result<()> {
     Ok(())
 }
 
+/// Starts the state service with the provided cache directory.
 pub async fn start_state_service_with_cache_dir(
     network: &Network,
     cache_dir: impl Into<std::path::PathBuf>,

zebra-state/src/service/finalized_state/column_family.rs

@@ -63,7 +63,7 @@ where
     batch: Batch,
 }
 
-impl<'cf, Key, Value> Debug for TypedColumnFamily<'cf, Key, Value>
+impl<Key, Value> Debug for TypedColumnFamily<'_, Key, Value>
 where
     Key: IntoDisk + FromDisk + Debug,
     Value: IntoDisk + FromDisk,
@@ -80,7 +80,7 @@ where
     }
 }
 
-impl<'cf, Key, Value> PartialEq for TypedColumnFamily<'cf, Key, Value>
+impl<Key, Value> PartialEq for TypedColumnFamily<'_, Key, Value>
 where
     Key: IntoDisk + FromDisk + Debug,
     Value: IntoDisk + FromDisk,
@@ -90,7 +90,7 @@ where
     }
 }
 
-impl<'cf, Key, Value> Eq for TypedColumnFamily<'cf, Key, Value>
+impl<Key, Value> Eq for TypedColumnFamily<'_, Key, Value>
 where
     Key: IntoDisk + FromDisk + Debug,
     Value: IntoDisk + FromDisk,
@@ -243,7 +243,7 @@ where
     }
 }
 
-impl<'cf, Key, Value> TypedColumnFamily<'cf, Key, Value>
+impl<Key, Value> TypedColumnFamily<'_, Key, Value>
 where
     Key: IntoDisk + FromDisk + Debug + Ord,
     Value: IntoDisk + FromDisk,
@@ -259,7 +259,7 @@ where
     }
 }
 
-impl<'cf, Key, Value> TypedColumnFamily<'cf, Key, Value>
+impl<Key, Value> TypedColumnFamily<'_, Key, Value>
 where
     Key: IntoDisk + FromDisk + Debug + Hash + Eq,
     Value: IntoDisk + FromDisk,
@@ -275,7 +275,7 @@ where
     }
 }
 
-impl<'cf, Key, Value, Batch> WriteTypedBatch<'cf, Key, Value, Batch>
+impl<Key, Value, Batch> WriteTypedBatch<'_, Key, Value, Batch>
 where
     Key: IntoDisk + FromDisk + Debug,
     Value: IntoDisk + FromDisk,
@@ -312,7 +312,7 @@ where
 }
 
 // Writing a batch to the database requires an owned batch.
-impl<'cf, Key, Value> WriteTypedBatch<'cf, Key, Value, DiskWriteBatch>
+impl<Key, Value> WriteTypedBatch<'_, Key, Value, DiskWriteBatch>
 where
     Key: IntoDisk + FromDisk + Debug,
     Value: IntoDisk + FromDisk,

zebra-state/src/service/finalized_state/disk_format.rs

@@ -68,7 +68,7 @@ pub trait FromDisk: Sized {
 
 // Generic serialization impls
 
-impl<'a, T> IntoDisk for &'a T
+impl<T> IntoDisk for &T
 where
     T: IntoDisk,
 {

zebra-state/src/service/non_finalized_state/chain.rs

@@ -1272,7 +1272,7 @@ impl Chain {
     pub fn partial_transparent_indexes<'a>(
         &'a self,
         addresses: &'a HashSet<transparent::Address>,
-    ) -> impl Iterator<Item = &TransparentTransfers> {
+    ) -> impl Iterator<Item = &'a TransparentTransfers> {
         addresses
             .iter()
             .flat_map(|address| self.partial_transparent_transfers.get(address))

zebrad/src/commands.rs

@@ -1,5 +1,7 @@
 //! Zebrad Subcommands
 
+#![allow(non_local_definitions)]
+
 use std::path::PathBuf;
 
 use abscissa_core::{config::Override, Command, Configurable, FrameworkError, Runnable};

zebrad/src/components/metrics.rs

@@ -1,5 +1,7 @@
 //! An HTTP endpoint for metrics collection.
 
+#![allow(non_local_definitions)]
+
 use std::net::SocketAddr;
 
 use abscissa_core::{Component, FrameworkError};

zebrad/src/components/tokio.rs

@@ -7,6 +7,8 @@
 //! The rayon thread pool is used for:
 //! - long-running CPU-bound tasks like cryptography, via [`rayon::spawn_fifo`].
 
+#![allow(non_local_definitions)]
+
 use std::{future::Future, time::Duration};
 
 use abscissa_core::{Component, FrameworkError, Shutdown};

zebrad/src/components/tracing/endpoint.rs

@@ -1,5 +1,7 @@
 //! An HTTP endpoint for dynamically setting tracing filters.
 
+#![allow(non_local_definitions)]
+
 use std::net::SocketAddr;
 
 use abscissa_core::{Component, FrameworkError};