mirror of
https://github.com/openimsdk/open-im-server.git
synced 2025-10-24 12:02:14 +08:00
84 lines
2.3 KiB
Go
84 lines
2.3 KiB
Go
package api
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import (
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"fmt"
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"math"
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"net/http"
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"strconv"
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"time"
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"github.com/gin-gonic/gin"
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"github.com/openimsdk/tools/apiresp"
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"github.com/openimsdk/tools/errs"
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"github.com/openimsdk/tools/log"
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"github.com/openimsdk/tools/stability/ratelimit"
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"github.com/openimsdk/tools/stability/ratelimit/bbr"
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)
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type RateLimiter struct {
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Enable bool `yaml:"enable"`
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Window time.Duration `yaml:"window"` // time duration per window
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Bucket int `yaml:"bucket"` // bucket number for each window
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CPUThreshold int64 `yaml:"cpuThreshold"` // CPU threshold; valid range 0–1000 (1000 = 100%)
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}
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func RateLimitMiddleware(config *RateLimiter) gin.HandlerFunc {
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if !config.Enable {
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return func(c *gin.Context) {
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c.Next()
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}
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}
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limiter := bbr.NewBBRLimiter(
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bbr.WithWindow(config.Window),
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bbr.WithBucket(config.Bucket),
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bbr.WithCPUThreshold(config.CPUThreshold),
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)
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return func(c *gin.Context) {
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status := limiter.Stat()
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c.Header("X-BBR-CPU", strconv.FormatInt(status.CPU, 10))
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c.Header("X-BBR-MinRT", strconv.FormatInt(status.MinRt, 10))
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c.Header("X-BBR-MaxPass", strconv.FormatInt(status.MaxPass, 10))
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c.Header("X-BBR-MaxInFlight", strconv.FormatInt(status.MaxInFlight, 10))
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c.Header("X-BBR-InFlight", strconv.FormatInt(status.InFlight, 10))
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done, err := limiter.Allow()
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if err != nil {
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c.Header("X-RateLimit-Policy", "BBR")
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c.Header("Retry-After", calculateBBRRetryAfter(status))
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c.Header("X-RateLimit-Limit", strconv.FormatInt(status.MaxInFlight, 10))
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c.Header("X-RateLimit-Remaining", "0") // There is no concept of remaining quota in BBR.
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fmt.Println("rate limited:", err, "path:", c.Request.URL.Path)
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log.ZWarn(c, "rate limited", err, "path", c.Request.URL.Path)
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c.AbortWithStatus(http.StatusTooManyRequests)
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apiresp.GinError(c, errs.NewCodeError(http.StatusTooManyRequests, "too many requests, please try again later"))
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return
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}
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c.Next()
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done(ratelimit.DoneInfo{})
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}
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}
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func calculateBBRRetryAfter(status bbr.Stat) string {
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loadRatio := float64(status.CPU) / float64(status.CPU)
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if loadRatio < 0.8 {
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return "1"
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}
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if loadRatio < 0.95 {
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return "2"
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}
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backoff := 1 + int64(math.Pow(loadRatio-0.95, 2)*50)
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if backoff > 5 {
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backoff = 5
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}
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return strconv.FormatInt(backoff, 10)
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}
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