Module rate_limit 

Rate limiting cache using fixed window algorithm.

This module provides per-wallet rate limiting for:

• Order placements
• Order cancellations
• API requests

Supports both Redis (for distributed rate limiting across multiple instances) and in-memory backends (for local development without Redis).

Structs

FixedWindowCounter 🔒

Fixed window counter for rate limiting (in-memory backend).

RateLimitCache

Rate limit cache using fixed window algorithm.

RateLimitInfo

Rate limit check result with metadata.

Enums

RateLimitAction

Type of rate-limited action.

RateLimitBackend

Backend type for rate limiting.

RateLimitError

Error returned when rate limit is exceeded or service is unavailable.

Constants

CHECK_AND_INCREMENT_LUA 🔒

Lua script for atomic check-and-increment in Redis. Returns {current_count, allowed (1=yes, 0=no)}

GET_COUNT_LUA 🔒

Lua script to get current count without incrementing.

REDIS_TTL_BUFFER_SECS 🔒

Extra TTL buffer to prevent race conditions at window boundaries (in seconds).