pmg/code-review-checklist.md

Code Review Checklist: Package Extractor

🔍 Code Structure & Organization

• Are the responsibilities clearly separated between configuration and extraction logic?
• Could the extractor struct be made more testable by extracting interfaces?
• Is the naming consistent throughout the file (e.g., ExtractorConfig vs extractor)?
• Should the global variables (NpmExtractors, PyPiExtractors) be constants or part of a configuration?

🛡️ Error Handling & Robustness

• What happens if e.Config.context is nil? Should there be validation?
• Are all potential error cases from the OSV-Scalibr library handled appropriately?
• Could the error message in ExtractManifestFiles() be more descriptive?
• What if scanResult.Inventory.Packages is nil or empty?

📊 Data Validation & Edge Cases

• Should ExtractorConfig validate that ExtractorsName and ExtractorType are compatible?
• What happens if ScanDir doesn't exist or isn't readable?
• Are there any assumptions about package name/version formats that could break?
• Should there be limits on the number of packages processed?

🚀 Performance & Resource Management

• Is the scanner being reused efficiently, or should it be cached/pooled?
• Could memory usage be optimized when processing large package lists?
• Are there any potential goroutine leaks in the scanning process?
• Should there be timeout handling for long-running scans?

🧪 Testing & Maintainability

• How would you unit test the ExtractManifestFiles() method?
• Are the dependencies (OSV-Scalibr) easily mockable for testing?
• Could the configuration creation be simplified or made more fluent?
• Is the code following Go conventions for package structure?

🔧 API Design Questions

• Should DefaultExtractorConfig() return a pointer or a value?
• Is the NewExtractor constructor providing enough validation?
• Could the extractor support multiple ecosystems in a single scan?
• Should there be a way to filter or transform packages during extraction?

💭 Think About These Scenarios

• What if a manifest file is corrupted or has unexpected format?
• How would this code behave with very large codebases (1000+ dependencies)?
• What happens if the scan is interrupted or cancelled via context?
• Should there be logging or progress reporting for long scans?

🎯 Next Steps to Explore

1. Research Question: Look up Go best practices for factory patterns - is NewExtractor following them?
2. Deep Dive: Investigate the OSV-Scalibr documentation - what other configuration options might be useful?
3. Design Pattern: Consider the Single Responsibility Principle - is this struct doing too much?
4. Error Handling: Research Go error wrapping patterns - could fmt.Errorf be improved?

🤔 Questions for Self-Reflection

• How would you explain what this code does to someone unfamiliar with package management?
• If you had to add support for a new package manager, how much code would you need to change?
• What's the most fragile part of this implementation, and why?
• How confident would you feel deploying this code to production?