76 lines
1.4 KiB
Go
76 lines
1.4 KiB
Go
package middleware
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import (
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"net/http"
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"sync"
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"time"
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"github.com/gin-gonic/gin"
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"golang.org/x/time/rate"
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)
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type RateLimiter struct {
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limiters map[string]*rate.Limiter
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mu sync.RWMutex
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r rate.Limit
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b int
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}
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func NewRateLimiter(r rate.Limit, b int) *RateLimiter {
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return &RateLimiter{
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limiters: make(map[string]*rate.Limiter),
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r: r,
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b: b,
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}
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}
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func (rl *RateLimiter) getLimiter(key string) *rate.Limiter {
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rl.mu.Lock()
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defer rl.mu.Unlock()
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limiter, exists := rl.limiters[key]
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if !exists {
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limiter = rate.NewLimiter(rl.r, rl.b)
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rl.limiters[key] = limiter
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}
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return limiter
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}
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// RateLimit creates a middleware that limits request rates per API key
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func RateLimit(r rate.Limit, burst int) gin.HandlerFunc {
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rl := NewRateLimiter(r, burst)
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return func(c *gin.Context) {
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key := c.GetHeader(APIKeyHeader)
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if key == "" {
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key = c.ClientIP()
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}
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limiter := rl.getLimiter(key)
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if !limiter.Allow() {
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c.JSON(http.StatusTooManyRequests, gin.H{
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"success": false,
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"error": "Rate limit exceeded",
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})
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c.Abort()
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return
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}
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c.Next()
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}
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}
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// CleanupTask periodically removes unused limiters
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func (rl *RateLimiter) CleanupTask(interval time.Duration) {
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ticker := time.NewTicker(interval)
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go func() {
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for range ticker.C {
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rl.mu.Lock()
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for key := range rl.limiters {
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delete(rl.limiters, key)
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}
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rl.mu.Unlock()
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}
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}()
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}
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