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4ef3a0e | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 | package middleware
import (
"context"
"fmt"
"github.com/gin-gonic/gin"
"net/http"
"one-api/common"
"time"
)
var timeFormat = "2006-01-02T15:04:05.000Z"
var inMemoryRateLimiter common.InMemoryRateLimiter
var defNext = func(c *gin.Context) {
c.Next()
}
func redisRateLimiter(c *gin.Context, maxRequestNum int, duration int64, mark string) {
ctx := context.Background()
rdb := common.RDB
key := "rateLimit:" + mark + c.ClientIP()
listLength, err := rdb.LLen(ctx, key).Result()
if err != nil {
fmt.Println(err.Error())
c.Status(http.StatusInternalServerError)
c.Abort()
return
}
if listLength < int64(maxRequestNum) {
rdb.LPush(ctx, key, time.Now().Format(timeFormat))
rdb.Expire(ctx, key, common.RateLimitKeyExpirationDuration)
} else {
oldTimeStr, _ := rdb.LIndex(ctx, key, -1).Result()
oldTime, err := time.Parse(timeFormat, oldTimeStr)
if err != nil {
fmt.Println(err)
c.Status(http.StatusInternalServerError)
c.Abort()
return
}
nowTimeStr := time.Now().Format(timeFormat)
nowTime, err := time.Parse(timeFormat, nowTimeStr)
if err != nil {
fmt.Println(err)
c.Status(http.StatusInternalServerError)
c.Abort()
return
}
// time.Since will return negative number!
// See: https://stackoverflow.com/questions/50970900/why-is-time-since-returning-negative-durations-on-windows
if int64(nowTime.Sub(oldTime).Seconds()) < duration {
rdb.Expire(ctx, key, common.RateLimitKeyExpirationDuration)
c.Status(http.StatusTooManyRequests)
c.Abort()
return
} else {
rdb.LPush(ctx, key, time.Now().Format(timeFormat))
rdb.LTrim(ctx, key, 0, int64(maxRequestNum-1))
rdb.Expire(ctx, key, common.RateLimitKeyExpirationDuration)
}
}
}
func memoryRateLimiter(c *gin.Context, maxRequestNum int, duration int64, mark string) {
key := mark + c.ClientIP()
if !inMemoryRateLimiter.Request(key, maxRequestNum, duration) {
c.Status(http.StatusTooManyRequests)
c.Abort()
return
}
}
func rateLimitFactory(maxRequestNum int, duration int64, mark string) func(c *gin.Context) {
if common.RedisEnabled {
return func(c *gin.Context) {
redisRateLimiter(c, maxRequestNum, duration, mark)
}
} else {
// It's safe to call multi times.
inMemoryRateLimiter.Init(common.RateLimitKeyExpirationDuration)
return func(c *gin.Context) {
memoryRateLimiter(c, maxRequestNum, duration, mark)
}
}
}
func GlobalWebRateLimit() func(c *gin.Context) {
if common.GlobalWebRateLimitEnable {
return rateLimitFactory(common.GlobalWebRateLimitNum, common.GlobalWebRateLimitDuration, "GW")
}
return defNext
}
func GlobalAPIRateLimit() func(c *gin.Context) {
if common.GlobalApiRateLimitEnable {
return rateLimitFactory(common.GlobalApiRateLimitNum, common.GlobalApiRateLimitDuration, "GA")
}
return defNext
}
func CriticalRateLimit() func(c *gin.Context) {
return rateLimitFactory(common.CriticalRateLimitNum, common.CriticalRateLimitDuration, "CT")
}
func DownloadRateLimit() func(c *gin.Context) {
return rateLimitFactory(common.DownloadRateLimitNum, common.DownloadRateLimitDuration, "DW")
}
func UploadRateLimit() func(c *gin.Context) {
return rateLimitFactory(common.UploadRateLimitNum, common.UploadRateLimitDuration, "UP")
}
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