activity: fix IP parsing, drop all columns with malformed ips

system/strings.go

@@ -1,29 +0,0 @@
-package system
-
-import (
-	"math/rand"
-	"regexp"
-	"strings"
-)
-
-var ipTrimRegex = regexp.MustCompile(`(:\d*)?$`)
-
-const characters = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ1234567890"
-
-// RandomString generates a random string of alpha-numeric characters using a
-// pseudo-random number generator. The output of this function IS NOT cryptographically
-// secure, it is used solely for generating random strings outside a security context.
-func RandomString(n int) string {
-	var b strings.Builder
-	b.Grow(n)
-	for i := 0; i < n; i++ {
-		b.WriteByte(characters[rand.Intn(len(characters))])
-	}
-	return b.String()
-}
-
-// TrimIPSuffix removes the internal port value from an IP address to ensure we're only
-// ever working directly with the IP address.
-func TrimIPSuffix(s string) string {
-	return ipTrimRegex.ReplaceAllString(s, "")
-}