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middleware.go
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middleware.go
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package rrl
import (
"github.com/gin-gonic/gin"
"log"
"net/http"
"strconv"
)
const (
HeaderRateLimit = "X-RateLimit-Limit"
HeaderRateLimitRemaining = "X-RateLimit-Remaining"
)
// RateLimiterMiddleware function is a middleware for the Gin web framework that enforces rate limiting on incoming requests.
// This middleware uses a RateLimiter instance to track and limit the number of requests a client can make within a specified time interval.
//
// Parameters:
//
// limiter (*RateLimiter): An instance of the RateLimiter struct that defines the rate limiting rules and interacts with Redis to enforce them.
//
// Returns:
//
// gin.HandlerFunc: A Gin handler function that can be used as middleware in the Gin router.
func RateLimiterMiddleware(limiter *RateLimiter) gin.HandlerFunc {
return func(c *gin.Context) {
ip := c.ClientIP()
if !limiter.IsRequestAllowed(ip) {
log.Printf("Rate limit exceeded for IP: %s", ip)
c.Header(HeaderRateLimitRemaining, strconv.Itoa(int(limiter.currentToken)))
c.Header(HeaderRateLimit, strconv.Itoa(int(limiter.MaxTokens)))
c.JSON(http.StatusTooManyRequests, gin.H{"error": "too many requests"})
c.Abort()
return
}
c.Next()
}
}