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da508c504d
As part of the conn25 work we will want to be able to keep track of a pool of IP Addresses and know which have been used and which have not. Fixes tailscale/corp#34247 Signed-off-by: Fran Bull <fran@tailscale.com>
61 lines
1.4 KiB
Go
61 lines
1.4 KiB
Go
// Copyright (c) Tailscale Inc & AUTHORS
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// SPDX-License-Identifier: BSD-3-Clause
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package appc
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import (
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"errors"
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"net/netip"
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"testing"
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"go4.org/netipx"
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"tailscale.com/util/must"
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)
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func TestNext(t *testing.T) {
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a := ippool{}
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_, err := a.next()
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if !errors.Is(err, errPoolExhausted) {
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t.Fatalf("expected errPoolExhausted, got %v", err)
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}
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var isb netipx.IPSetBuilder
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ipset := must.Get(isb.IPSet())
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b := newIPPool(ipset)
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_, err = b.next()
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if !errors.Is(err, errPoolExhausted) {
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t.Fatalf("expected errPoolExhausted, got %v", err)
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}
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isb.AddRange(netipx.IPRangeFrom(netip.MustParseAddr("192.168.0.0"), netip.MustParseAddr("192.168.0.2")))
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isb.AddRange(netipx.IPRangeFrom(netip.MustParseAddr("200.0.0.0"), netip.MustParseAddr("200.0.0.0")))
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isb.AddRange(netipx.IPRangeFrom(netip.MustParseAddr("201.0.0.0"), netip.MustParseAddr("201.0.0.1")))
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ipset = must.Get(isb.IPSet())
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c := newIPPool(ipset)
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expected := []string{
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"192.168.0.0",
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"192.168.0.1",
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"192.168.0.2",
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"200.0.0.0",
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"201.0.0.0",
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"201.0.0.1",
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}
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for i, want := range expected {
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addr, err := c.next()
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if err != nil {
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t.Fatal(err)
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}
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if addr != netip.MustParseAddr(want) {
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t.Fatalf("next call %d want: %s, got: %v", i, want, addr)
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}
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}
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_, err = c.next()
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if !errors.Is(err, errPoolExhausted) {
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t.Fatalf("expected errPoolExhausted, got %v", err)
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}
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_, err = c.next()
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if !errors.Is(err, errPoolExhausted) {
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t.Fatalf("expected errPoolExhausted, got %v", err)
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}
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}
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