• lightning/src/util/hash_tables.rs (7 hunks)

lightning/src/util/hash_tables.rs (10)

• 19-19: The usage of std::collections::HashMap is correctly preserved under the condition that the hashbrown feature is not enabled. This ensures backward compatibility and maintains the expected behavior in environments where std is available.
• 21-21: The re-export of std::collections::{hash_map, HashSet} under a conditional compilation flag is a good practice for maintaining modularity and ensuring that the correct data structures are used based on the build features.
• 29-31: The new_hash_map function definition is straightforward and correctly utilizes the HashMap::new() method. This is a clean and efficient way to provide a utility function for creating new hash maps.
• 36-42: The hash_map_from_iter function is correctly implemented to create a HashMap from an iterator. This utility function enhances the code's readability and usability by abstracting the creation process.
• 46-48: The new_hash_set function is correctly implemented, providing a simple and effective way to create a new HashSet. This contributes to the consistency and readability of the codebase.
• 52-54: The hash_set_from_iter function is correctly implemented, allowing for the creation of a HashSet from an iterator. This utility function is a valuable addition for simplifying set creation.
• 76-92: > 📝 NOTE

This review was outside the diff hunks and was mapped to the diff hunk with the greatest overlap. Original lines [79-112]

The RandomState struct and its implementation within the hasher module under the hashbrown_tables mod show a thoughtful approach to handling hash randomization in a no-std environment. The use of getrandom to opportunistically randomize the hash state is a good security practice. However, it's important to ensure that the possiblyrandom feature is correctly managed across different build configurations to avoid potential issues.

Verification successful

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The possiblyrandom feature is correctly configured in the Cargo.toml file, and its usage within the codebase is limited to the lightning/src/util/hash_tables.rs file. This indicates a thoughtful approach to managing the feature across different build configurations, with no evidence of unintended side effects based on the provided context.

Scripts Executed

The following scripts were executed for the analysis:

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Script:

#!/bin/bash
# Verify that the `possiblyrandom` feature is correctly configured in Cargo.toml
rg 'possiblyrandom' Cargo.toml
# Ensure no unintended side effects in different build configurations
rg 'feature = "possiblyrandom"' --files-with-matches

Length of output: 198

* 124-124: The re-export of the `hasher` module's contents under the `hashbrown_tables` mod is a clean way to manage the visibility and usage of the `RandomState` struct and related functionality. This helps maintain a clear structure and separation of concerns within the module. * 143-149: The modified `hash_map_from_iter` function within the `hashbrown_tables` mod introduces a more efficient way to create a `HashMap` from an iterator by pre-allocating the minimum required capacity. This optimization can lead to performance improvements, especially for large collections. It's a good practice to consider the iterator's size hint for capacity estimation. * 163-165: The modified `hash_set_from_iter` function, similar to `hash_map_from_iter`, optimizes the creation of a `HashSet` from an iterator by pre-allocating the minimum required capacity. This change is consistent with the approach taken for hash maps and is a good example of applying performance optimizations uniformly across similar functionalities.