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Ensure algorithm robustness

neondatabase/neon
Based on 4 comments
Rust

When implementing algorithms, ensure they handle all edge cases correctly and robustly. Code should gracefully manage exceptional conditions rather than producing incorrect results or panicking.

Algorithms Rust

Reviewer Prompt

When implementing algorithms, ensure they handle all edge cases correctly and robustly. Code should gracefully manage exceptional conditions rather than producing incorrect results or panicking.

Key practices:

  1. Test boundary conditions: Verify your algorithm works correctly with empty collections, maximum/minimum values, and other edge cases.

  2. Handle hash functions comprehensively: Include all relevant state in hash functions to prevent unintended collisions.

// Suboptimal: Missing important fields
impl Hash for ImportTask {
    fn hash<H: Hasher>(&self, state: &mut H) {
        self.key_range.hash(state);
        self.path.hash(state);
    }
}

// Better: Includes all relevant fields
impl Hash for ImportTask {
    fn hash<H: Hasher>(&self, state: &mut H) {
        self.shard_identity.hash(state);  // Include this for robustness
        self.key_range.hash(state);
        self.path.hash(state);
    }
}
  1. Be cautious with floating-point comparisons: Don’t assume exact equality or that values will sum to expected amounts due to precision errors.
// Problematic: Assumes perfect precision
if total_percentage == 100.0 {
    // ...
}

// Better: Use appropriate epsilon or handle the last case separately
let last_variant = variants.last().unwrap();
if mapped_user_id <= total_percentage / 100.0 {
    return Some(last_variant.key.clone());
}
  1. Verify logical conditions carefully: Double-check complex conditionals to ensure they express exactly what you intend.
// Incorrect: Complex condition with a logic error
if !(plan_hash == progress.import_plan_hash || progress.jobs != plan.jobs.len()) {
    anyhow::bail!("Import plan does not match storcon metadata");
}

// Correct: Simplified, clear conditions
if plan_hash != progress.import_plan_hash {
    anyhow::bail!("Import plan hash does not match storcon metadata hash");
}
if progress.jobs != plan.jobs.len() {
    anyhow::bail!("Import plan job length does not match storcon metadata");
}
  1. Document known limitations: When an algorithm doesn’t handle certain cases, clearly document these limitations to prevent misuse.
4
Comments Analyzed
Rust
Primary Language
Algorithms
Category

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