mirror of
https://github.com/songquanpeng/message-pusher.git
synced 2024-05-03 08:45:04 +08:00
104 lines
3.0 KiB
Go
104 lines
3.0 KiB
Go
package middleware
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import (
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"context"
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"fmt"
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"github.com/gin-gonic/gin"
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"message-pusher/common"
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"net/http"
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"time"
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)
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var timeFormat = "2006-01-02T15:04:05.000Z"
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var inMemoryRateLimiter common.InMemoryRateLimiter
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func redisRateLimiter(c *gin.Context, maxRequestNum int, duration int64, mark string) {
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ctx := context.Background()
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rdb := common.RDB
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key := "rateLimit:" + mark + c.ClientIP()
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listLength, err := rdb.LLen(ctx, key).Result()
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if err != nil {
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fmt.Println(err.Error())
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c.Status(http.StatusInternalServerError)
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c.Abort()
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return
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}
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if listLength < int64(maxRequestNum) {
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rdb.LPush(ctx, key, time.Now().Format(timeFormat))
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rdb.Expire(ctx, key, common.RateLimitKeyExpirationDuration)
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} else {
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oldTimeStr, _ := rdb.LIndex(ctx, key, -1).Result()
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oldTime, err := time.Parse(timeFormat, oldTimeStr)
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if err != nil {
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fmt.Println(err)
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c.Status(http.StatusInternalServerError)
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c.Abort()
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return
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}
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nowTimeStr := time.Now().Format(timeFormat)
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nowTime, err := time.Parse(timeFormat, nowTimeStr)
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if err != nil {
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fmt.Println(err)
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c.Status(http.StatusInternalServerError)
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c.Abort()
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return
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}
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// time.Since will return negative number!
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// See: https://stackoverflow.com/questions/50970900/why-is-time-since-returning-negative-durations-on-windows
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if int64(nowTime.Sub(oldTime).Seconds()) < duration {
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rdb.Expire(ctx, key, common.RateLimitKeyExpirationDuration)
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c.Status(http.StatusTooManyRequests)
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c.Abort()
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return
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} else {
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rdb.LPush(ctx, key, time.Now().Format(timeFormat))
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rdb.LTrim(ctx, key, 0, int64(maxRequestNum-1))
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rdb.Expire(ctx, key, common.RateLimitKeyExpirationDuration)
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}
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}
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}
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func memoryRateLimiter(c *gin.Context, maxRequestNum int, duration int64, mark string) {
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key := mark + c.ClientIP()
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if !inMemoryRateLimiter.Request(key, maxRequestNum, duration) {
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c.Status(http.StatusTooManyRequests)
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c.Abort()
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return
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}
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}
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func rateLimitFactory(maxRequestNum int, duration int64, mark string) func(c *gin.Context) {
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if common.RedisEnabled {
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return func(c *gin.Context) {
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redisRateLimiter(c, maxRequestNum, duration, mark)
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}
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} else {
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// It's safe to call multi times.
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inMemoryRateLimiter.Init(common.RateLimitKeyExpirationDuration)
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return func(c *gin.Context) {
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memoryRateLimiter(c, maxRequestNum, duration, mark)
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}
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}
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}
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func GlobalWebRateLimit() func(c *gin.Context) {
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return rateLimitFactory(common.GlobalWebRateLimitNum, common.GlobalWebRateLimitDuration, "GW")
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}
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func GlobalAPIRateLimit() func(c *gin.Context) {
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return rateLimitFactory(common.GlobalApiRateLimitNum, common.GlobalApiRateLimitDuration, "GA")
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}
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func CriticalRateLimit() func(c *gin.Context) {
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return rateLimitFactory(common.CriticalRateLimitNum, common.CriticalRateLimitDuration, "CT")
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}
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func DownloadRateLimit() func(c *gin.Context) {
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return rateLimitFactory(common.DownloadRateLimitNum, common.DownloadRateLimitDuration, "DW")
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}
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func UploadRateLimit() func(c *gin.Context) {
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return rateLimitFactory(common.UploadRateLimitNum, common.UploadRateLimitDuration, "UP")
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}
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