Standardise clippy lints and require docs (#2238)

* Standardise lints across Zebra crates, and add missing docs

The only remaining module with missing docs is `zebra_test::command`

* Todo -> TODO

* Clarify what a transcript ErrorChecker does

Also change `Error` -> `BoxError`

* TransError -> ExpectedTranscriptError

* Output Descriptions -> Output descriptions

book/src/dev/rfcs/drafts/data-flow-2020-07-22.md

@@ -55,7 +55,7 @@
                     - Compute SigHash on data to be signed and _previous_ data to be signed
                     - Check joinsplit signature on data to be signed
                         - If fail, check on previous data to be signed : https://github.com/zcash/zcash/blob/ab2b7c0969391d8a57d90d008665da02f3f618e7/src/main.cpp#L971
-                    - Check Spend/Output Descriptions 
+                    - Check Spend/Output descriptions
                         - Check Spends: https://github.com/zcash/zcash/blob/ab2b7c0969391d8a57d90d008665da02f3f618e7/src/main.cpp#L998
                         - Check Outputs: https://github.com/zcash/zcash/blob/ab2b7c0969391d8a57d90d008665da02f3f618e7/src/main.cpp#L1018
                         - Check final balances: https://github.com/zcash/zcash/blob/ab2b7c0969391d8a57d90d008665da02f3f618e7/src/main.cpp#L1036

tower-batch/src/lib.rs

@@ -85,6 +85,12 @@
 //! control logic, as it will receive explicit [`Flush`](BatchControl::Flush)
 //! requests from the wrapper.
 
+// Standard lints
+#![warn(missing_docs)]
+#![allow(clippy::try_err)]
+#![deny(clippy::await_holding_lock)]
+#![forbid(unsafe_code)]
+
 pub mod error;
 pub mod future;
 mod layer;

tower-batch/tests/ed25519.rs

@@ -1,3 +1,9 @@
+// Standard lints
+#![warn(missing_docs)]
+#![allow(clippy::try_err)]
+#![deny(clippy::await_holding_lock)]
+#![forbid(unsafe_code)]
+
 use std::{
     future::Future,
     mem,

tower-batch/tests/worker.rs

@@ -1,3 +1,9 @@
+// Standard lints
+#![warn(missing_docs)]
+#![allow(clippy::try_err)]
+#![deny(clippy::await_holding_lock)]
+#![forbid(unsafe_code)]
+
 use std::time::Duration;
 use tokio_test::{assert_pending, assert_ready, assert_ready_err, task};
 use tower::{Service, ServiceExt};

tower-fallback/src/lib.rs

@@ -10,9 +10,16 @@
 //!
 //! [aws-fallback]: https://aws.amazon.com/builders-library/avoiding-fallback-in-distributed-systems/
 
+// Standard lints
+#![warn(missing_docs)]
+#![allow(clippy::try_err)]
+#![deny(clippy::await_holding_lock)]
+#![forbid(unsafe_code)]
+
 pub mod future;
 mod service;
 
 pub use self::service::Fallback;
 
+/// A boxed type-erased `std::error::Error` that can be sent between threads.
 pub type BoxedError = Box<dyn std::error::Error + Send + Sync + 'static>;

tower-fallback/tests/fallback.rs

@@ -1,3 +1,9 @@
+// Standard lints
+#![warn(missing_docs)]
+#![allow(clippy::try_err)]
+#![deny(clippy::await_holding_lock)]
+#![forbid(unsafe_code)]
+
 use tower::{service_fn, Service, ServiceExt};
 use tower_fallback::Fallback;
 

zebra-chain/benches/block.rs

@@ -1,3 +1,10 @@
+// Standard lints
+// Disabled due to warnings in criterion macros
+//#![warn(missing_docs)]
+#![allow(clippy::try_err)]
+#![deny(clippy::await_holding_lock)]
+#![forbid(unsafe_code)]
+
 use std::io::Cursor;
 
 use criterion::{criterion_group, criterion_main, BenchmarkId, Criterion};

zebra-chain/src/block.rs

@@ -1,5 +1,4 @@
 //! Blocks and block-related structures (heights, headers, etc.)
-#![allow(clippy::unit_arg)]
 
 mod commitment;
 mod hash;

zebra-chain/src/block/commitment.rs

@@ -171,7 +171,7 @@ pub struct ChainHistoryBlockTxAuthCommitmentHash([u8; 32]);
 /// all possible verification failures enumerates the consensus rules we
 /// implement, and ensures that we don't reject blocks or transactions
 /// for a non-enumerated reason.
-#[allow(dead_code)]
+#[allow(dead_code, missing_docs)]
 #[derive(Error, Debug, PartialEq)]
 pub enum CommitmentError {
     #[error("invalid pre-Sapling reserved committment: expected all zeroes, actual: {actual:?}")]

zebra-chain/src/block/header.rs

@@ -84,6 +84,7 @@ pub struct Header {
 /// TODO: Use this error as the source for zebra_consensus::error::BlockError::Time,
 /// and make `BlockError::Time` add additional context.
 /// See https://github.com/ZcashFoundation/zebra/issues/1021 for more details.
+#[allow(missing_docs)]
 #[derive(Error, Debug)]
 pub enum BlockTimeError {
     #[error("invalid time {0:?} in block header {1:?} {2:?}: block time is more than 2 hours in the future ({3:?}). Hint: check your machine's date, time, and time zone.")]
@@ -126,7 +127,11 @@ impl Header {
 #[derive(Debug, Clone, PartialEq, Eq)]
 #[cfg_attr(any(test, feature = "proptest-impl"), derive(Arbitrary))]
 pub struct CountedHeader {
+    /// The header for a block
     pub header: Header,
+    /// The number of transactions that come after the header
+    ///
+    /// TODO: should this always be zero? (#1924)
     pub transaction_count: usize,
 }
 

zebra-chain/src/block/tests.rs

@@ -1,3 +1,5 @@
+//! Tests for Zebra blocks
+
 // XXX generate should be rewritten as strategies
 #[cfg(any(test, feature = "bench"))]
 pub mod generate;

zebra-chain/src/lib.rs

@@ -1,4 +1,4 @@
-//! Core Zcash data structures. 🦓
+//! Core Zcash data structures.
 //!
 //! This crate provides definitions of core data structures for Zcash, such as
 //! blocks, transactions, addresses, etc.
@@ -6,14 +6,11 @@
 #![doc(html_favicon_url = "https://www.zfnd.org/images/zebra-favicon-128.png")]
 #![doc(html_logo_url = "https://www.zfnd.org/images/zebra-icon.png")]
 #![doc(html_root_url = "https://doc.zebra.zfnd.org/zebra_chain")]
+// Standard lints
+#![warn(missing_docs)]
 #![allow(clippy::try_err)]
-// The actual lints we want to disable
-#![allow(clippy::unnecessary_wraps)]
-// Disable some broken or unwanted clippy nightly lints
-// Build without warnings on nightly 2021-01-17 and later and stable 1.51 and later
-#![allow(unknown_lints)]
-// Disable old lint warnings on nightly until 1.51 is stable
-#![allow(renamed_and_removed_lints)]
+#![deny(clippy::await_holding_lock)]
+#![forbid(unsafe_code)]
 
 #[macro_use]
 extern crate serde;

zebra-chain/src/orchard/keys/tests.rs

@@ -30,7 +30,7 @@ impl Arbitrary for TransmissionKey {
 proptest! {
 
     #[test]
-    #[allow(clone_on_copy, cmp_owned)]
+    #[allow(clippy::clone_on_copy, clippy::cmp_owned)]
     fn generate_keys(spending_key in any::<SpendingKey>()) {
         zebra_test::init();
 

zebra-chain/src/primitives/redpallas.rs

@@ -1,3 +1,5 @@
+//! RedPallas cryptographic primitives.
+
 // -*- mode: rust; -*-
 //
 // This file is part of redjubjub.
@@ -12,6 +14,7 @@ use group::GroupEncoding;
 use halo2::pasta::pallas;
 
 mod constants;
+#[allow(missing_docs)]
 mod error;
 mod hash;
 mod signature;

zebra-chain/src/sapling/commitment.rs

@@ -147,7 +147,7 @@ impl NoteCommitment {
 }
 
 /// A Homomorphic Pedersen commitment to the value of a note, used in Spend and
-/// Output Descriptions.
+/// Output descriptions.
 ///
 /// https://zips.z.cash/protocol/protocol.pdf#concretehomomorphiccommit
 #[derive(Clone, Copy, Deserialize, PartialEq, Serialize)]

zebra-chain/src/sapling/output.rs

@@ -1,3 +1,7 @@
+//! Sapling _Output descriptions_, as described in [protocol specification §7.4][ps].
+//!
+//! [ps]: https://zips.z.cash/protocol/protocol.pdf#outputencoding
+
 use std::io;
 
 use crate::{

zebra-chain/src/serialization/arbitrary.rs

@@ -1,3 +1,5 @@
+//! Arbitrary data generation for serialization proptests
+
 use super::{read_zcash::canonical_ip_addr, DateTime32};
 use chrono::{TimeZone, Utc, MAX_DATETIME, MIN_DATETIME};
 use proptest::{arbitrary::any, prelude::*};

zebra-chain/src/transaction/arbitrary.rs

@@ -1,3 +1,5 @@
+//! Arbitrary data generation for transaction proptests
+
 use std::{convert::TryInto, sync::Arc};
 
 use chrono::{TimeZone, Utc};

zebra-chain/src/transaction/sighash.rs

@@ -1,3 +1,5 @@
+//! Signature hashes for Zcash transactions
+
 use super::Transaction;
 
 use crate::{
@@ -29,9 +31,13 @@ const ZCASH_SHIELDED_OUTPUTS_HASH_PERSONALIZATION: &[u8; 16] = b"ZcashSOutputHas
 bitflags::bitflags! {
     /// The different SigHash types, as defined in https://zips.z.cash/zip-0143
     pub struct HashType: u32 {
+        /// Sign all the outputs
         const ALL = 0b0000_0001;
+        /// Sign none of the outputs - anyone can spend
         const NONE = 0b0000_0010;
+        /// Sign one of the outputs - anyone can spend the rest
         const SINGLE = Self::ALL.bits | Self::NONE.bits;
+        /// Anyone can add inputs to this transaction
         const ANYONECANPAY = 0b1000_0000;
     }
 }

zebra-chain/src/work/difficulty.rs

@@ -132,6 +132,7 @@ impl fmt::Debug for ExpandedDifficulty {
 pub struct Work(u128);
 
 impl Work {
+    /// Return the inner `u128` value.
     pub fn as_u128(self) -> u128 {
         self.0
     }

zebra-client/src/lib.rs

@@ -1,3 +1,10 @@
+//! A Zebra wallet client
+
 #![doc(html_favicon_url = "https://www.zfnd.org/images/zebra-favicon-128.png")]
 #![doc(html_logo_url = "https://www.zfnd.org/images/zebra-icon.png")]
 #![doc(html_root_url = "https://doc.zebra.zfnd.org/zebra_client")]
+// Standard lints
+#![warn(missing_docs)]
+#![allow(clippy::try_err)]
+#![deny(clippy::await_holding_lock)]
+#![forbid(unsafe_code)]

zebra-consensus/src/block/tests.rs

@@ -18,39 +18,40 @@ use zebra_chain::{
     transaction::{arbitrary::transaction_to_fake_v5, Transaction},
     work::difficulty::{ExpandedDifficulty, INVALID_COMPACT_DIFFICULTY},
 };
-use zebra_test::transcript::{TransError, Transcript};
+use zebra_test::transcript::{ExpectedTranscriptError, Transcript};
 
-static VALID_BLOCK_TRANSCRIPT: Lazy<Vec<(Arc<Block>, Result<block::Hash, TransError>)>> =
-    Lazy::new(|| {
-        let block: Arc<_> =
-            Block::zcash_deserialize(&zebra_test::vectors::BLOCK_MAINNET_GENESIS_BYTES[..])
-                .unwrap()
-                .into();
-        let hash = Ok(block.as_ref().into());
-        vec![(block, hash)]
-    });
+static VALID_BLOCK_TRANSCRIPT: Lazy<
+    Vec<(Arc<Block>, Result<block::Hash, ExpectedTranscriptError>)>,
+> = Lazy::new(|| {
+    let block: Arc<_> =
+        Block::zcash_deserialize(&zebra_test::vectors::BLOCK_MAINNET_GENESIS_BYTES[..])
+            .unwrap()
+            .into();
+    let hash = Ok(block.as_ref().into());
+    vec![(block, hash)]
+});
 
-static INVALID_TIME_BLOCK_TRANSCRIPT: Lazy<Vec<(Arc<Block>, Result<block::Hash, TransError>)>> =
-    Lazy::new(|| {
-        let mut block: Block =
-            Block::zcash_deserialize(&zebra_test::vectors::BLOCK_MAINNET_GENESIS_BYTES[..])
-                .unwrap();
+static INVALID_TIME_BLOCK_TRANSCRIPT: Lazy<
+    Vec<(Arc<Block>, Result<block::Hash, ExpectedTranscriptError>)>,
+> = Lazy::new(|| {
+    let mut block: Block =
+        Block::zcash_deserialize(&zebra_test::vectors::BLOCK_MAINNET_GENESIS_BYTES[..]).unwrap();
 
-        // Modify the block's time
-        // Changing the block header also invalidates the header hashes, but
-        // those checks should be performed later in validation, because they
-        // are more expensive.
-        let three_hours_in_the_future = Utc::now()
-            .checked_add_signed(chrono::Duration::hours(3))
-            .ok_or_else(|| eyre!("overflow when calculating 3 hours in the future"))
-            .unwrap();
-        block.header.time = three_hours_in_the_future;
+    // Modify the block's time
+    // Changing the block header also invalidates the header hashes, but
+    // those checks should be performed later in validation, because they
+    // are more expensive.
+    let three_hours_in_the_future = Utc::now()
+        .checked_add_signed(chrono::Duration::hours(3))
+        .ok_or_else(|| eyre!("overflow when calculating 3 hours in the future"))
+        .unwrap();
+    block.header.time = three_hours_in_the_future;
 
-        vec![(Arc::new(block), Err(TransError::Any))]
-    });
+    vec![(Arc::new(block), Err(ExpectedTranscriptError::Any))]
+});
 
 static INVALID_HEADER_SOLUTION_TRANSCRIPT: Lazy<
-    Vec<(Arc<Block>, Result<block::Hash, TransError>)>,
+    Vec<(Arc<Block>, Result<block::Hash, ExpectedTranscriptError>)>,
 > = Lazy::new(|| {
     let mut block: Block =
         Block::zcash_deserialize(&zebra_test::vectors::BLOCK_MAINNET_GENESIS_BYTES[..]).unwrap();
@@ -58,50 +59,49 @@ static INVALID_HEADER_SOLUTION_TRANSCRIPT: Lazy<
     // Change nonce to something invalid
     block.header.nonce = [0; 32];
 
-    vec![(Arc::new(block), Err(TransError::Any))]
+    vec![(Arc::new(block), Err(ExpectedTranscriptError::Any))]
 });
 
-static INVALID_COINBASE_TRANSCRIPT: Lazy<Vec<(Arc<Block>, Result<block::Hash, TransError>)>> =
-    Lazy::new(|| {
-        let header =
-            block::Header::zcash_deserialize(&zebra_test::vectors::DUMMY_HEADER[..]).unwrap();
+static INVALID_COINBASE_TRANSCRIPT: Lazy<
+    Vec<(Arc<Block>, Result<block::Hash, ExpectedTranscriptError>)>,
+> = Lazy::new(|| {
+    let header = block::Header::zcash_deserialize(&zebra_test::vectors::DUMMY_HEADER[..]).unwrap();
 
-        // Test 1: Empty transaction
-        let block1 = Block {
-            header,
-            transactions: Vec::new(),
-        };
+    // Test 1: Empty transaction
+    let block1 = Block {
+        header,
+        transactions: Vec::new(),
+    };
 
-        // Test 2: Transaction at first position is not coinbase
-        let mut transactions = Vec::new();
-        let tx = zebra_test::vectors::DUMMY_TX1
-            .zcash_deserialize_into()
-            .unwrap();
-        transactions.push(tx);
-        let block2 = Block {
-            header,
-            transactions,
-        };
+    // Test 2: Transaction at first position is not coinbase
+    let mut transactions = Vec::new();
+    let tx = zebra_test::vectors::DUMMY_TX1
+        .zcash_deserialize_into()
+        .unwrap();
+    transactions.push(tx);
+    let block2 = Block {
+        header,
+        transactions,
+    };
 
-        // Test 3: Invalid coinbase position
-        let mut block3 =
-            Block::zcash_deserialize(&zebra_test::vectors::BLOCK_MAINNET_GENESIS_BYTES[..])
-                .unwrap();
-        assert_eq!(block3.transactions.len(), 1);
+    // Test 3: Invalid coinbase position
+    let mut block3 =
+        Block::zcash_deserialize(&zebra_test::vectors::BLOCK_MAINNET_GENESIS_BYTES[..]).unwrap();
+    assert_eq!(block3.transactions.len(), 1);
 
-        // Extract the coinbase transaction from the block
-        let coinbase_transaction = block3.transactions.get(0).unwrap().clone();
+    // Extract the coinbase transaction from the block
+    let coinbase_transaction = block3.transactions.get(0).unwrap().clone();
 
-        // Add another coinbase transaction to block
-        block3.transactions.push(coinbase_transaction);
-        assert_eq!(block3.transactions.len(), 2);
+    // Add another coinbase transaction to block
+    block3.transactions.push(coinbase_transaction);
+    assert_eq!(block3.transactions.len(), 2);
 
-        vec![
-            (Arc::new(block1), Err(TransError::Any)),
-            (Arc::new(block2), Err(TransError::Any)),
-            (Arc::new(block3), Err(TransError::Any)),
-        ]
-    });
+    vec![
+        (Arc::new(block1), Err(ExpectedTranscriptError::Any)),
+        (Arc::new(block2), Err(ExpectedTranscriptError::Any)),
+        (Arc::new(block3), Err(ExpectedTranscriptError::Any)),
+    ]
+});
 
 // TODO: enable this test after implementing contextual verification
 // #[tokio::test]

zebra-consensus/src/chain.rs

@@ -1,3 +1,8 @@
+//! Top-level semantic block verification for Zebra.
+//!
+//! Verifies blocks using the [`CheckpointVerifier`] or full [`BlockVerifier`],
+//! depending on the config and block height.
+
 #[cfg(test)]
 mod tests;
 
@@ -52,6 +57,7 @@ where
     max_checkpoint_height: block::Height,
 }
 
+/// An error while semantically verifying a block.
 #[derive(Debug, Display, Error)]
 pub enum VerifyChainError {
     /// block could not be checkpointed

zebra-consensus/src/chain/tests.rs

@@ -12,7 +12,7 @@ use zebra_chain::{
     serialization::ZcashDeserialize,
 };
 use zebra_state as zs;
-use zebra_test::transcript::{TransError, Transcript};
+use zebra_test::transcript::{ExpectedTranscriptError, Transcript};
 
 use crate::Config;
 
@@ -72,59 +72,63 @@ async fn verifiers_from_network(
     (chain_verifier, state_service)
 }
 
-static BLOCK_VERIFY_TRANSCRIPT_GENESIS: Lazy<Vec<(Arc<Block>, Result<block::Hash, TransError>)>> =
-    Lazy::new(|| {
-        let block: Arc<_> =
-            Block::zcash_deserialize(&zebra_test::vectors::BLOCK_MAINNET_GENESIS_BYTES[..])
-                .unwrap()
-                .into();
-        let hash = Ok(block.hash());
+static BLOCK_VERIFY_TRANSCRIPT_GENESIS: Lazy<
+    Vec<(Arc<Block>, Result<block::Hash, ExpectedTranscriptError>)>,
+> = Lazy::new(|| {
+    let block: Arc<_> =
+        Block::zcash_deserialize(&zebra_test::vectors::BLOCK_MAINNET_GENESIS_BYTES[..])
+            .unwrap()
+            .into();
+    let hash = Ok(block.hash());
 
-        vec![(block, hash)]
-    });
+    vec![(block, hash)]
+});
 
 static BLOCK_VERIFY_TRANSCRIPT_GENESIS_FAIL: Lazy<
-    Vec<(Arc<Block>, Result<block::Hash, TransError>)>,
+    Vec<(Arc<Block>, Result<block::Hash, ExpectedTranscriptError>)>,
 > = Lazy::new(|| {
     let block: Arc<_> =
         Block::zcash_deserialize(&zebra_test::vectors::BLOCK_MAINNET_GENESIS_BYTES[..])
             .unwrap()
             .into();
 
-    vec![(block, Err(TransError::Any))]
+    vec![(block, Err(ExpectedTranscriptError::Any))]
 });
 
-static NO_COINBASE_TRANSCRIPT: Lazy<Vec<(Arc<Block>, Result<block::Hash, TransError>)>> =
-    Lazy::new(|| {
-        let block = block_no_transactions();
+static NO_COINBASE_TRANSCRIPT: Lazy<
+    Vec<(Arc<Block>, Result<block::Hash, ExpectedTranscriptError>)>,
+> = Lazy::new(|| {
+    let block = block_no_transactions();
 
-        vec![(Arc::new(block), Err(TransError::Any))]
-    });
+    vec![(Arc::new(block), Err(ExpectedTranscriptError::Any))]
+});
 
-static NO_COINBASE_STATE_TRANSCRIPT: Lazy<Vec<(zs::Request, Result<zs::Response, TransError>)>> =
-    Lazy::new(|| {
-        let block = block_no_transactions();
-        let hash = block.hash();
+static NO_COINBASE_STATE_TRANSCRIPT: Lazy<
+    Vec<(zs::Request, Result<zs::Response, ExpectedTranscriptError>)>,
+> = Lazy::new(|| {
+    let block = block_no_transactions();
+    let hash = block.hash();
 
-        vec![(
-            zs::Request::Block(hash.into()),
-            Ok(zs::Response::Block(None)),
-        )]
-    });
+    vec![(
+        zs::Request::Block(hash.into()),
+        Ok(zs::Response::Block(None)),
+    )]
+});
 
-static STATE_VERIFY_TRANSCRIPT_GENESIS: Lazy<Vec<(zs::Request, Result<zs::Response, TransError>)>> =
-    Lazy::new(|| {
-        let block: Arc<_> =
-            Block::zcash_deserialize(&zebra_test::vectors::BLOCK_MAINNET_GENESIS_BYTES[..])
-                .unwrap()
-                .into();
-        let hash = block.hash();
+static STATE_VERIFY_TRANSCRIPT_GENESIS: Lazy<
+    Vec<(zs::Request, Result<zs::Response, ExpectedTranscriptError>)>,
+> = Lazy::new(|| {
+    let block: Arc<_> =
+        Block::zcash_deserialize(&zebra_test::vectors::BLOCK_MAINNET_GENESIS_BYTES[..])
+            .unwrap()
+            .into();
+    let hash = block.hash();
 
-        vec![(
-            zs::Request::Block(hash.into()),
-            Ok(zs::Response::Block(Some(block))),
-        )]
-    });
+    vec![(
+        zs::Request::Block(hash.into()),
+        Ok(zs::Response::Block(Some(block))),
+    )]
+});
 
 #[tokio::test]
 async fn verify_checkpoint_test() -> Result<(), Report> {

zebra-consensus/src/lib.rs

@@ -33,18 +33,12 @@
 #![doc(html_favicon_url = "https://www.zfnd.org/images/zebra-favicon-128.png")]
 #![doc(html_logo_url = "https://www.zfnd.org/images/zebra-icon.png")]
 #![doc(html_root_url = "https://doc.zebra.zfnd.org/zebra_consensus")]
-// Re-enable this after cleaning the API surface.
-//#![deny(missing_docs)]
+// Standard lints
+// Warn on missing docs for all modules after cleaning the API surface
+#![warn(missing_docs)]
 #![allow(clippy::try_err)]
-// Disable some broken or unwanted clippy nightly lints
-// Build without warnings on nightly 2021-01-17 and later and stable 1.51 and later
-#![allow(unknown_lints)]
-// Disable old lint warnings on nightly until 1.51 is stable
-#![allow(renamed_and_removed_lints)]
-// Use the old lint name to build without warnings on stable until 1.51 is stable
-#![allow(clippy::unknown_clippy_lints)]
-// The actual lints we want to disable
-#![allow(clippy::unnecessary_wraps)]
+#![deny(clippy::await_holding_lock)]
+#![forbid(unsafe_code)]
 
 mod block;
 mod checkpoint;
@@ -56,6 +50,7 @@ mod script;
 mod transaction;
 
 pub mod chain;
+#[allow(missing_docs)]
 pub mod error;
 
 pub use checkpoint::MAX_CHECKPOINT_BYTE_COUNT;

zebra-network/src/lib.rs

@@ -33,20 +33,11 @@
 #![doc(html_favicon_url = "https://www.zfnd.org/images/zebra-favicon-128.png")]
 #![doc(html_logo_url = "https://www.zfnd.org/images/zebra-icon.png")]
 #![doc(html_root_url = "https://doc.zebra.zfnd.org/zebra_network")]
-#![deny(missing_docs)]
+// Standard lints
+#![warn(missing_docs)]
 #![allow(clippy::try_err)]
-// Tracing causes false positives on this lint:
-// https://github.com/tokio-rs/tracing/issues/553
-#![allow(clippy::cognitive_complexity)]
-// Disable some broken or unwanted clippy nightly lints
-// Build without warnings on nightly 2021-01-17 and later and stable 1.51 and later
-#![allow(unknown_lints)]
-// Disable old lint warnings on nightly until 1.51 is stable
-#![allow(renamed_and_removed_lints)]
-// Use the old lint name to build without warnings on stable until 1.51 is stable
-#![allow(clippy::unknown_clippy_lints)]
-// The actual lints we want to disable
-#![allow(clippy::unnecessary_wraps)]
+#![deny(clippy::await_holding_lock)]
+#![forbid(unsafe_code)]
 
 #[macro_use]
 extern crate pin_project;

zebra-rpc/src/lib.rs

@@ -1,3 +1,10 @@
+//! A Zebra remote procedure call interface
+
 #![doc(html_favicon_url = "https://www.zfnd.org/images/zebra-favicon-128.png")]
 #![doc(html_logo_url = "https://www.zfnd.org/images/zebra-icon.png")]
 #![doc(html_root_url = "https://doc.zebra.zfnd.org/zebra_rpc")]
+// Standard lints
+#![warn(missing_docs)]
+#![allow(clippy::try_err)]
+#![deny(clippy::await_holding_lock)]
+#![forbid(unsafe_code)]

zebra-script/src/lib.rs

@@ -2,6 +2,11 @@
 #![doc(html_favicon_url = "https://www.zfnd.org/images/zebra-favicon-128.png")]
 #![doc(html_logo_url = "https://www.zfnd.org/images/zebra-icon.png")]
 #![doc(html_root_url = "https://doc.zebra.zfnd.org/zebra_script")]
+// Standard lints
+#![warn(missing_docs)]
+#![allow(clippy::try_err)]
+#![deny(clippy::await_holding_lock)]
+// we allow unsafe code to call zcash_script
 
 use displaydoc::Display;
 #[cfg(windows)]
@@ -82,6 +87,7 @@ impl CachedFfiTransaction {
         }
     }
 
+    /// Returns the transparent inputs for this transaction.
     pub fn inputs(&self) -> &[transparent::Input] {
         self.transaction.inputs()
     }

zebra-state/src/lib.rs

@@ -3,17 +3,11 @@
 #![doc(html_favicon_url = "https://www.zfnd.org/images/zebra-favicon-128.png")]
 #![doc(html_logo_url = "https://www.zfnd.org/images/zebra-icon.png")]
 #![doc(html_root_url = "https://doc.zebra.zfnd.org/zebra_state")]
+// Standard lints
 #![warn(missing_docs)]
 #![allow(clippy::try_err)]
-// Disable some broken or unwanted clippy nightly lints
-// Build without warnings on nightly 2021-01-17 and later and stable 1.51 and later
-#![allow(unknown_lints)]
-// Disable old lint warnings on nightly until 1.51 is stable
-#![allow(renamed_and_removed_lints)]
-// Use the old lint name to build without warnings on stable until 1.51 is stable
-#![allow(clippy::unknown_clippy_lints)]
-// The actual lints we want to disable
-#![allow(clippy::unnecessary_wraps)]
+#![deny(clippy::await_holding_lock)]
+#![forbid(unsafe_code)]
 
 mod config;
 pub mod constants;

zebra-state/tests/basic.rs

@@ -1,51 +1,59 @@
+// Standard lints
+#![warn(missing_docs)]
+#![allow(clippy::try_err)]
+#![deny(clippy::await_holding_lock)]
+#![forbid(unsafe_code)]
+
 use color_eyre::eyre::Report;
 use once_cell::sync::Lazy;
 use std::sync::Arc;
 use tempdir::TempDir;
 use zebra_chain::{block::Block, parameters::Network, serialization::ZcashDeserialize};
-use zebra_test::transcript::{TransError, Transcript};
+use zebra_test::transcript::{ExpectedTranscriptError, Transcript};
 
 use zebra_state::*;
 
-static COMMIT_FINALIZED_BLOCK_MAINNET: Lazy<Vec<(Request, Result<Response, TransError>)>> =
-    Lazy::new(|| {
-        let block: Arc<_> =
-            Block::zcash_deserialize(&zebra_test::vectors::BLOCK_MAINNET_GENESIS_BYTES[..])
-                .unwrap()
-                .into();
-        let block2 = block.clone();
-        let hash = block.hash();
-        vec![
-            (
-                Request::CommitFinalizedBlock(block.into()),
-                Ok(Response::Committed(hash)),
-            ),
-            (
-                Request::Block(hash.into()),
-                Ok(Response::Block(Some(block2))),
-            ),
-        ]
-    });
+static COMMIT_FINALIZED_BLOCK_MAINNET: Lazy<
+    Vec<(Request, Result<Response, ExpectedTranscriptError>)>,
+> = Lazy::new(|| {
+    let block: Arc<_> =
+        Block::zcash_deserialize(&zebra_test::vectors::BLOCK_MAINNET_GENESIS_BYTES[..])
+            .unwrap()
+            .into();
+    let block2 = block.clone();
+    let hash = block.hash();
+    vec![
+        (
+            Request::CommitFinalizedBlock(block.into()),
+            Ok(Response::Committed(hash)),
+        ),
+        (
+            Request::Block(hash.into()),
+            Ok(Response::Block(Some(block2))),
+        ),
+    ]
+});
 
-static COMMIT_FINALIZED_BLOCK_TESTNET: Lazy<Vec<(Request, Result<Response, TransError>)>> =
-    Lazy::new(|| {
-        let block: Arc<_> =
-            Block::zcash_deserialize(&zebra_test::vectors::BLOCK_TESTNET_GENESIS_BYTES[..])
-                .unwrap()
-                .into();
-        let block2 = block.clone();
-        let hash = block.hash();
-        vec![
-            (
-                Request::CommitFinalizedBlock(block.into()),
-                Ok(Response::Committed(hash)),
-            ),
-            (
-                Request::Block(hash.into()),
-                Ok(Response::Block(Some(block2))),
-            ),
-        ]
-    });
+static COMMIT_FINALIZED_BLOCK_TESTNET: Lazy<
+    Vec<(Request, Result<Response, ExpectedTranscriptError>)>,
+> = Lazy::new(|| {
+    let block: Arc<_> =
+        Block::zcash_deserialize(&zebra_test::vectors::BLOCK_TESTNET_GENESIS_BYTES[..])
+            .unwrap()
+            .into();
+    let block2 = block.clone();
+    let hash = block.hash();
+    vec![
+        (
+            Request::CommitFinalizedBlock(block.into()),
+            Ok(Response::Committed(hash)),
+        ),
+        (
+            Request::Block(hash.into()),
+            Ok(Response::Block(Some(block2))),
+        ),
+    ]
+});
 
 #[tokio::test]
 async fn check_transcripts_mainnet() -> Result<(), Report> {

zebra-test/src/command.rs

@@ -1,3 +1,5 @@
+//! Launching test commands for Zebra integration and acceptance tests.
+
 use color_eyre::{
     eyre::{eyre, Context, Report, Result},
     Help, SectionExt,
@@ -24,6 +26,7 @@ pub fn test_cmd(command_path: &str, tempdir: &Path) -> Result<Command> {
     Ok(cmd)
 }
 
+/// Wrappers for `Command` methods to integrate with [`zebra_test`].
 pub trait CommandExt {
     /// wrapper for `status` fn on `Command` that constructs informative error
     /// reports

zebra-test/src/lib.rs

@@ -1,5 +1,12 @@
 //! Miscellaneous test code for Zebra.
-
+#![doc(html_favicon_url = "https://www.zfnd.org/images/zebra-favicon-128.png")]
+#![doc(html_logo_url = "https://www.zfnd.org/images/zebra-icon.png")]
+#![doc(html_root_url = "https://doc.zebra.zfnd.org/zebra_test")]
+// Standard lints
+#![warn(missing_docs)]
+#![allow(clippy::try_err)]
+#![deny(clippy::await_holding_lock)]
+#![forbid(unsafe_code)]
 // Each lazy_static variable uses additional recursion
 #![recursion_limit = "256"]
 
@@ -10,6 +17,7 @@ use tracing_subscriber::{fmt, prelude::*, EnvFilter};
 
 use std::sync::Once;
 
+#[allow(missing_docs)]
 pub mod command;
 pub mod prelude;
 pub mod transcript;

zebra-test/src/prelude.rs

@@ -1,3 +1,5 @@
+//! Common [`zebra_test`] types, traits, and functions.
+
 pub use crate::command::{test_cmd, CommandExt, TestChild};
 pub use std::process::Stdio;
 

zebra-test/src/transcript.rs

@@ -13,25 +13,34 @@ use std::{
 };
 use tower::{Service, ServiceExt};
 
-type Error = Box<dyn std::error::Error + Send + Sync + 'static>;
+type BoxError = Box<dyn std::error::Error + Send + Sync + 'static>;
 
-pub type ErrorChecker = fn(Option<Error>) -> Result<(), Error>;
+/// An error-checking function: is the value an expected error?
+///
+/// If the checked error is the expected error, the function should return `Ok(())`.
+/// Otherwise, it should just return the checked error, wrapped inside `Err`.
+pub type ErrorChecker = fn(Option<BoxError>) -> Result<(), BoxError>;
 
+/// An expected error in a transcript.
 #[derive(Debug, Clone)]
-pub enum TransError {
+pub enum ExpectedTranscriptError {
+    /// Match any error
     Any,
+    /// Use a validator function to check for matching errors
     Exact(Arc<ErrorChecker>),
 }
 
-impl TransError {
+impl ExpectedTranscriptError {
+    /// Convert the `verifier` function into an exact error checker
     pub fn exact(verifier: ErrorChecker) -> Self {
-        TransError::Exact(verifier.into())
+        ExpectedTranscriptError::Exact(verifier.into())
     }
 
-    fn check(&self, e: Error) -> Result<(), Report> {
+    /// Check the actual error `e` against this expected error.
+    fn check(&self, e: BoxError) -> Result<(), Report> {
         match self {
-            TransError::Any => Ok(()),
-            TransError::Exact(checker) => checker(Some(e)),
+            ExpectedTranscriptError::Any => Ok(()),
+            ExpectedTranscriptError::Exact(checker) => checker(Some(e)),
         }
         .map_err(ErrorCheckerError)
         .wrap_err("service returned an error but it didn't match the expected error")
@@ -39,29 +48,32 @@ impl TransError {
 
     fn mock(&self) -> Report {
         match self {
-            TransError::Any => eyre!("mock error"),
-            TransError::Exact(checker) => checker(None).map_err(|e| eyre!(e)).expect_err(
-                "transcript should correctly produce the expected mock error when passed None",
-            ),
+            ExpectedTranscriptError::Any => eyre!("mock error"),
+            ExpectedTranscriptError::Exact(checker) => {
+                checker(None).map_err(|e| eyre!(e)).expect_err(
+                    "transcript should correctly produce the expected mock error when passed None",
+                )
+            }
         }
     }
 }
 
 #[derive(Debug, thiserror::Error)]
 #[error("ErrorChecker Error: {0}")]
-struct ErrorCheckerError(Error);
+struct ErrorCheckerError(BoxError);
 
+/// A transcript: a list of requests and expected results.
 #[must_use]
 pub struct Transcript<R, S, I>
 where
-    I: Iterator<Item = (R, Result<S, TransError>)>,
+    I: Iterator<Item = (R, Result<S, ExpectedTranscriptError>)>,
 {
     messages: I,
 }
 
 impl<R, S, I> From<I> for Transcript<R, S, I::IntoIter>
 where
-    I: IntoIterator<Item = (R, Result<S, TransError>)>,
+    I: IntoIterator<Item = (R, Result<S, ExpectedTranscriptError>)>,
 {
     fn from(messages: I) -> Self {
         Self {
@@ -72,14 +84,15 @@ where
 
 impl<R, S, I> Transcript<R, S, I>
 where
-    I: Iterator<Item = (R, Result<S, TransError>)>,
+    I: Iterator<Item = (R, Result<S, ExpectedTranscriptError>)>,
     R: Debug,
     S: Debug + Eq,
 {
+    /// Check this transcript against the responses from the `to_check` service
     pub async fn check<C>(mut self, mut to_check: C) -> Result<(), Report>
     where
         C: Service<R, Response = S>,
-        C::Error: Into<Error>,
+        C::Error: Into<BoxError>,
     {
         for (req, expected_rsp) in &mut self.messages {
             // These unwraps could propagate errors with the correct
@@ -146,7 +159,7 @@ where
 impl<R, S, I> Service<R> for Transcript<R, S, I>
 where
     R: Debug + Eq,
-    I: Iterator<Item = (R, Result<S, TransError>)>,
+    I: Iterator<Item = (R, Result<S, ExpectedTranscriptError>)>,
 {
     type Response = S;
     type Error = Report;

zebra-test/src/vectors/block.rs

@@ -1,5 +1,7 @@
 //! Block test vectors
 
+#![allow(missing_docs)]
+
 use hex::FromHex;
 use lazy_static::lazy_static;
 

zebra-test/tests/command.rs

@@ -1,4 +1,8 @@
+// Standard lints
+#![warn(missing_docs)]
 #![allow(clippy::try_err)]
+#![deny(clippy::await_holding_lock)]
+#![forbid(unsafe_code)]
 
 use std::{process::Command, time::Duration};
 

zebra-test/tests/transcript.rs

@@ -1,10 +1,14 @@
+// Standard lints
+#![warn(missing_docs)]
 #![allow(clippy::try_err)]
+#![deny(clippy::await_holding_lock)]
+#![forbid(unsafe_code)]
 
 use tower::{Service, ServiceExt};
-use zebra_test::transcript::TransError;
+use zebra_test::transcript::ExpectedTranscriptError;
 use zebra_test::transcript::Transcript;
 
-const TRANSCRIPT_DATA: [(&str, Result<&str, TransError>); 4] = [
+const TRANSCRIPT_DATA: [(&str, Result<&str, ExpectedTranscriptError>); 4] = [
     ("req1", Ok("rsp1")),
     ("req2", Ok("rsp2")),
     ("req3", Ok("rsp3")),
@@ -52,11 +56,11 @@ async fn self_check() {
 #[error("Error")]
 struct Error;
 
-const TRANSCRIPT_DATA2: [(&str, Result<&str, TransError>); 4] = [
+const TRANSCRIPT_DATA2: [(&str, Result<&str, ExpectedTranscriptError>); 4] = [
     ("req1", Ok("rsp1")),
     ("req2", Ok("rsp2")),
     ("req3", Ok("rsp3")),
-    ("req4", Err(TransError::Any)),
+    ("req4", Err(ExpectedTranscriptError::Any)),
 ];
 
 #[tokio::test]

zebra-utils/src/bin/zebra-checkpoints/main.rs

@@ -8,8 +8,11 @@
 //! zebra-consensus accepts an ordered list of checkpoints, starting with the
 //! genesis block. Checkpoint heights can be chosen arbitrarily.
 
-#![deny(missing_docs)]
+// Standard lints
+#![warn(missing_docs)]
 #![allow(clippy::try_err)]
+#![deny(clippy::await_holding_lock)]
+#![forbid(unsafe_code)]
 
 use color_eyre::eyre::{ensure, Result};
 use serde_json::Value;

zebra-utils/src/lib.rs

@@ -1,3 +1,11 @@
 //! Utilities for Zebra development, not for library or application users.
 //!
 //! Currently this consists only of the zebra-checkpoints binary.
+#![doc(html_favicon_url = "https://www.zfnd.org/images/zebra-favicon-128.png")]
+#![doc(html_logo_url = "https://www.zfnd.org/images/zebra-icon.png")]
+#![doc(html_root_url = "https://doc.zebra.zfnd.org/zebra_utils")]
+// Standard lints
+#![warn(missing_docs)]
+#![allow(clippy::try_err)]
+#![deny(clippy::await_holding_lock)]
+#![forbid(unsafe_code)]

zebrad/src/bin/zebrad/main.rs

@@ -1,6 +1,9 @@
 //! Main entry point for Zebrad
 
-#![deny(missing_docs, trivial_casts, unused_qualifications)]
+// Standard lints
+#![warn(missing_docs)]
+#![allow(clippy::try_err)]
+#![deny(clippy::await_holding_lock)]
 #![forbid(unsafe_code)]
 
 use zebrad::application::APPLICATION;

zebrad/src/lib.rs

@@ -17,7 +17,10 @@
 #![doc(html_favicon_url = "https://www.zfnd.org/images/zebra-favicon-128.png")]
 #![doc(html_logo_url = "https://www.zfnd.org/images/zebra-icon.png")]
 #![doc(html_root_url = "https://doc.zebra.zfnd.org/zebrad")]
-//#![deny(warnings, missing_docs, trivial_casts, unused_qualifications)]
+// Standard lints
+#![warn(missing_docs)]
+#![allow(clippy::try_err)]
+#![deny(clippy::await_holding_lock)]
 #![forbid(unsafe_code)]
 // Tracing causes false positives on this lint:
 // https://github.com/tokio-rs/tracing/issues/553

zebrad/src/sentry.rs

@@ -1,9 +1,14 @@
+//! Integration with sentry.io for event reporting.
+//!
+//! Currently handles panic reports.
+
 #[allow(unused_imports)]
 use sentry::{
     integrations::backtrace::current_stacktrace,
     protocol::{Event, Exception, Mechanism},
 };
 
+/// Send a panic `msg` to the sentry service.
 pub fn panic_event_from<T>(msg: T) -> Event<'static>
 where
     T: ToString,
@@ -16,9 +21,9 @@ where
             ..Default::default()
         }),
         value: Some(msg.to_string()),
-        // Sentry does not handle panic = abort well yet, and when gibven this
+        // Sentry does not handle panic = abort well yet, and when given this
         // stacktrace, it consists only of this line, making Sentry dedupe
-        // events together by their stacetrace fingerprint incorrectly.
+        // events together by their stacktrace fingerprint incorrectly.
         //
         // stacktrace: current_stacktrace(),
         ..Default::default()

zebrad/tests/acceptance.rs

@@ -12,10 +12,11 @@
 //!   - run zebrad on a custom cache path and port,
 //!   - run zcashd on a custom port.
 
-#![warn(warnings, missing_docs, trivial_casts, unused_qualifications)]
-#![forbid(unsafe_code)]
-#![allow(dead_code)]
+// Standard lints
+#![warn(missing_docs)]
 #![allow(clippy::try_err)]
+#![deny(clippy::await_holding_lock)]
+#![forbid(unsafe_code)]
 
 use color_eyre::eyre::Result;
 use eyre::WrapErr;
@@ -747,8 +748,8 @@ fn sync_large_checkpoints_mainnet() -> Result<()> {
     Ok(())
 }
 
-// Todo: We had a `sync_large_checkpoints_testnet` here but it was removed because
-// the testnet is unreliable(#1222). Enable after we have more testnet instances(#1791).
+// TODO: We had a `sync_large_checkpoints_testnet` here but it was removed because
+// the testnet is unreliable (#1222). Enable after we have more testnet instances (#1791).
 
 /// Sync `network` until `zebrad` reaches `height`, and ensure that
 /// the output contains `stop_regex`. If `reuse_tempdir` is supplied,
@@ -851,7 +852,8 @@ fn sync_past_canopy(network: Network) -> Result<()> {
 // drives populated by the first two tests, snapshot those drives, and then use
 // those to more quickly run the second two tests.
 
-// Sync up to the canopy activation height on mainnet and stop.
+/// Sync up to the canopy activation height on mainnet and stop.
+#[allow(dead_code)]
 #[cfg_attr(feature = "test_sync_to_canopy_mainnet", test)]
 fn sync_to_canopy_mainnet() {
     zebra_test::init();
@@ -859,7 +861,8 @@ fn sync_to_canopy_mainnet() {
     create_cached_database(network).unwrap();
 }
 
-// Sync to the canopy activation height testnet and stop.
+/// Sync to the canopy activation height testnet and stop.
+#[allow(dead_code)]
 #[cfg_attr(feature = "test_sync_to_canopy_testnet", test)]
 fn sync_to_canopy_testnet() {
     zebra_test::init();
@@ -872,6 +875,7 @@ fn sync_to_canopy_testnet() {
 /// This assumes that the config'd state is already synced at or near Canopy
 /// activation on mainnet. If the state has already synced past Canopy
 /// activation by 1200 blocks, it will fail.
+#[allow(dead_code)]
 #[cfg_attr(feature = "test_sync_past_canopy_mainnet", test)]
 fn sync_past_canopy_mainnet() {
     zebra_test::init();
@@ -884,6 +888,7 @@ fn sync_past_canopy_mainnet() {
 /// This assumes that the config'd state is already synced at or near Canopy
 /// activation on testnet. If the state has already synced past Canopy
 /// activation by 1200 blocks, it will fail.
+#[allow(dead_code)]
 #[cfg_attr(feature = "test_sync_past_canopy_testnet", test)]
 fn sync_past_canopy_testnet() {
     zebra_test::init();
@@ -1056,7 +1061,7 @@ async fn tracing_endpoint() -> Result<()> {
 
     // Make sure tracing endpoint was started
     output.stdout_contains(format!(r"Opened tracing endpoint at {}", endpoint).as_str())?;
-    // Todo: Match some trace level messages from output
+    // TODO: Match some trace level messages from output
 
     // [Note on port conflict](#Note on port conflict)
     output