feat(gno): enhance reactions retrievals

[MikaelVallenet]

⚠️ Description is AI generated and could contains some inconsistencies

PR: Optimize Reaction System Performance

Problem Statement

Our current implementation of the reaction system suffers from several performance issues:

1. Inefficient Data Storage: We store user reactions as string arrays, requiring O(n) operations to check if a user has voted.
2. Redundant String Parsing: Each lookup requires parsing the composite keys.
3. Excessive Memory Usage: Storing full user lists for each reaction consumes unnecessary memory.
4. Scalability Concerns: As user engagement grows, these operations become increasingly expensive.

Solution

This PR refactors the reaction system to leverage two distinct AVL trees more efficiently:

1. reactions tree: Stores aggregate reaction counts per post/icon combination

   • Key format: localPostId:icon
   • Value: Simple integer count

2. userReactions tree: Tracks individual user reactions

   • Key format: localPostId:icon:userAddress
   • Value: Empty struct (serving as a set marker)

Implementation Details

The refactoring focuses on two key functions:

1. ReactPost: Now handles toggling reactions by manipulating both trees atomically:

   • Adds/removes individual user reaction markers
   • Increments/decrements aggregate counts
   • Removes count entries that reach zero

2. GetPostReactions: Optimized to:

   • Efficiently iterate through reactions for a post
   • Directly access reaction counts
   • Perform O(1) lookups to check if a user has voted

Performance Benefits

• Faster Lookups: O(1) operations to check if a user has reacted (vs previous O(n))
• Reduced Memory: Storing integer counts instead of user arrays
• No String Splitting: Direct key access instead of parsing composite keys
• Better Scaling: Performance remains consistent regardless of reaction count

Tradeoffs

• Increased Implementation Complexity: Managing two trees requires careful synchronization
• Storage Overhead: Some duplication in keys across both trees
• Atomic Operations: Updates must modify both trees to maintain consistency

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Name	Status	Preview	Comments	Updated (UTC)
zenao	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Mar 14, 2025 4:04pm