/
rateLimit.go
42 lines (33 loc) · 881 Bytes
/
rateLimit.go
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package lib
import (
"net"
"github.com/ulule/limiter/v3"
"github.com/ulule/limiter/v3/drivers/store/memory"
)
// InitRateLimiter - initialize the rate limiter instance
func InitRateLimiter(formattedRateLimit, trustedPlatform string) (*limiter.Limiter, error) {
if formattedRateLimit == "" {
return nil, nil
}
rate, err := limiter.NewRateFromFormatted(formattedRateLimit)
if err != nil {
return nil, err
}
// use an in-memory store with a goroutine which clears expired keys
store := memory.NewStore()
// custom IPv6 mask
ipv6Mask := net.CIDRMask(64, 128)
options := []limiter.Option{
limiter.WithIPv6Mask(ipv6Mask),
}
if trustedPlatform != "" {
options = append(options, limiter.WithClientIPHeader(trustedPlatform))
}
// create the limiter instance
limiterInstance := limiter.New(
store,
rate,
options...,
)
return limiterInstance, nil
}