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Fix false positive in ContainsAll function

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As the `ContainsAll` is working with a match counter, it could return
a false positive when the `haystack` slice contains duplicate elements.

This can be checked with the included testing scenario, with
`haystack = [1, 1]` and `needles = [1, 2]`. Iterating over the haystack
to check for items to be present in needles will increase the match
counter to 2, even if `2` is not present in the first slice.
This commit is contained in:
Michael Manganiello 2023-05-12 09:51:47 -03:00
parent f4e6874ff0
commit ebd4367dda
2 changed files with 13 additions and 9 deletions
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14
util/util.go
View file

@ -6,7 +6,6 @@ import (
"encoding/json"
"errors"
"fmt"
"golang.org/x/time/rate"
"io"
"math/rand"
"net/netip"
@ -17,6 +16,8 @@ import (
"sync"
"time"
"golang.org/x/time/rate"
"github.com/gabriel-vasile/mimetype"
"golang.org/x/term"
)
@ -67,15 +68,12 @@ func ContainsIP(haystack []netip.Prefix, needle netip.Addr) bool {
// ContainsAll returns true if all needles are contained in haystack
func ContainsAll[T comparable](haystack []T, needles []T) bool {
matches := 0
for _, s := range haystack {
for _, needle := range needles {
if s == needle {
matches++
}
for _, needle := range needles {
if !Contains(haystack, needle) {
return false
}
}
return matches == len(needles)
return true
}
// SplitNoEmpty splits a string using strings.Split, but filters out empty strings

8
util/util_test.go
View file

@ -2,7 +2,6 @@ package util
import (
"errors"
"golang.org/x/time/rate"
"io"
"net/netip"
"os"
@ -11,6 +10,8 @@ import (
"testing"
"time"
"golang.org/x/time/rate"
"github.com/stretchr/testify/require"
)
@ -49,6 +50,11 @@ func TestContains(t *testing.T) {
require.False(t, Contains(s, 3))
}
func TestContainsAll(t *testing.T) {
require.True(t, ContainsAll([]int{1, 2, 3}, []int{2, 3}))
require.False(t, ContainsAll([]int{1, 1}, []int{1, 2}))
}
func TestContainsIP(t *testing.T) {
require.True(t, ContainsIP([]netip.Prefix{netip.MustParsePrefix("fd00::/8"), netip.MustParsePrefix("1.1.0.0/16")}, netip.MustParseAddr("1.1.1.1")))
require.True(t, ContainsIP([]netip.Prefix{netip.MustParsePrefix("fd00::/8"), netip.MustParsePrefix("1.1.0.0/16")}, netip.MustParseAddr("fd12:1234:5678::9876")))