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Greptile Overview

Greptile Summary

Fixed a critical array index out-of-bounds panic in the create_wal_dir_datetime_filter function. The month_days array is 0-indexed (indices 0-11) but was being accessed with month values ranging from 1-12, causing a panic when processing December (month=12).

Key Changes:

• Changed month_days[month as usize] to month_days[(month-1) as usize] on line 202
• This prevents array index out-of-bounds panic when filtering WAL directory paths with December dates
• The fix is minimal, correct, and directly addresses the root cause of the panic

Confidence Score: 5/5

• This PR is safe to merge with no risk
• The fix is a single-character change that correctly addresses a critical off-by-one indexing error. The month_days array has 12 elements (indices 0-11), and month values range from 1-12, so subtracting 1 before indexing is the correct solution. The existing tests validate the datetime filtering logic, and this change prevents the panic that would occur when processing December dates.
• No files require special attention

Important Files Changed

File Analysis

Sequence Diagram

sequenceDiagram
    participant Caller
    participant create_wal_dir_datetime_filter
    participant Filter Closure
    participant month_days Array

    Caller->>create_wal_dir_datetime_filter: Call with start_time, end_time, extension, skip_count
    create_wal_dir_datetime_filter->>Filter Closure: Create filter closure
    
    loop For each path
        Caller->>Filter Closure: Call with PathBuf
        Filter Closure->>Filter Closure: Parse year from path
        Filter Closure->>Filter Closure: Parse month (1-12) from path
        Filter Closure->>month_days Array: Access month_days[(month-1)]
        Note over Filter Closure,month_days Array: Fixed: month-1 prevents panic<br/>when month=12 (Dec)
        month_days Array-->>Filter Closure: Return days in month
        Filter Closure->>Filter Closure: Validate day against days in month
        Filter Closure->>Filter Closure: Parse hour and check date range
        Filter Closure-->>Caller: Return true/false
    end