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✨ feat: added config Rate Limiting and Throttling #15
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,94 @@ | ||
| package middlewares | ||
|
|
||
| import ( | ||
| "fmt" | ||
| "net" | ||
| "net/http" | ||
| "sync" | ||
| "time" | ||
|
|
||
| "github.com/gin-gonic/gin" | ||
| syncconf "github.com/sivaosorg/gocell/internal/syncConf" | ||
| "github.com/sivaosorg/govm/entity" | ||
| "github.com/sivaosorg/govm/logger" | ||
| "github.com/sivaosorg/govm/ratelimitx" | ||
| "golang.org/x/time/rate" | ||
| ) | ||
|
|
||
| // https://blog.logrocket.com/rate-limiting-go-application/ | ||
| type client struct { | ||
| limiter *rate.Limiter | ||
| last time.Time | ||
| } | ||
|
|
||
| var ( | ||
| mu sync.Mutex | ||
| clients = make(map[string]*client) | ||
| cleanupTypeWhitelist = time.Minute | ||
| cleanupWhitelist = 2 * cleanupTypeWhitelist | ||
| ) | ||
|
|
||
| func (m *MiddlewareManager) RateLimitMiddleWare(key string) gin.HandlerFunc { | ||
| rates := syncconf.Params.RateLimits | ||
| clusters := ratelimitx.NewClusterMultiTenantRateLimitConfig().SetClusters(rates) | ||
| go m.cleanupWhitelist() | ||
| return func(c *gin.Context) { | ||
| conf, err := clusters.FindClusterBy(key) | ||
| if err != nil || !conf.Config.IsEnabled { | ||
| return | ||
| } | ||
| ip, err := m.decodeNetwork(c) | ||
| if err != nil { | ||
| response := entity.NewResponseEntity().BadRequest(http.StatusText(http.StatusBadRequest), nil) | ||
| response.SetError(err) | ||
| c.JSON(response.StatusCode, response) | ||
| c.Abort() | ||
| return | ||
| } | ||
| mu.Lock() | ||
| if _, found := clients[ip]; !found { | ||
| clients[ip] = &client{limiter: rate.NewLimiter(rate.Limit(conf.Config.Rate), conf.Config.MaxBurst)} | ||
| } | ||
| clients[ip].last = time.Now() | ||
| if !clients[ip].limiter.Allow() { | ||
| mu.Unlock() | ||
| response := entity.NewResponseEntity().TooManyRequest(http.StatusText(http.StatusTooManyRequests), nil) | ||
| c.JSON(response.StatusCode, response) | ||
| c.Abort() | ||
| return | ||
| } | ||
| mu.Unlock() | ||
| c.Next() | ||
| } | ||
| } | ||
|
|
||
| func (m *MiddlewareManager) NetMiddleware() gin.HandlerFunc { | ||
| return func(c *gin.Context) { | ||
| ip, err := m.decodeNetwork(c) | ||
| if err != nil { | ||
| m.notification(c, err, http.StatusBadRequest) | ||
| } | ||
| logger.Debugf(fmt.Sprintf("_endpoint: %v, incoming on IP: %v", c.Request.RequestURI, ip)) | ||
| c.Next() | ||
| } | ||
| } | ||
|
|
||
| func (m *MiddlewareManager) decodeNetwork(c *gin.Context) (ip string, err error) { | ||
| ip, _, err = net.SplitHostPort(c.Request.RemoteAddr) | ||
| return ip, err | ||
| } | ||
|
|
||
| func (m *MiddlewareManager) cleanupWhitelist() { | ||
| for { | ||
| time.Sleep(cleanupTypeWhitelist) | ||
| mu.Lock() | ||
| for ip, client := range clients { | ||
| remain := time.Since(client.last) | ||
| if remain > cleanupWhitelist { | ||
| logger.Debugf(fmt.Sprintf("Cleanup whitelist too many requests for IP: %v and remain duration: %v", ip, remain)) | ||
| delete(clients, ip) | ||
| } | ||
| } | ||
| mu.Unlock() | ||
| } | ||
| } |
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