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servers: wrap bufconn fake ports within the valid range #367

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Merged
meling merged 1 commit into from
Oct 13, 2026
Merged

servers: wrap bufconn fake ports within the valid range #367

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6 changes: 4 additions & 2 deletions internal/testutils/servers/bufconn.go
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Original file line number Diff line number Diff line change
Expand Up @@ -34,9 +34,11 @@ var globalBufconnRegistry = &bufconnRegistry{
dialers: make(map[testing.TB]bufconnDialer),
}

// nextAddress generates a unique fake address for a bufconn listener.
// nextAddress generates a fake address for a bufconn listener. The port wraps
// around within the valid range, so a long -count run does not overflow it;
// addresses only need to be distinct among the listeners alive at once.
func (r *bufconnRegistry) nextAddress() string {
port := r.portCounter.Add(1)
port := r.portCounter.Add(1) % (65536 - 10000)
return fmt.Sprintf("127.0.0.1:%d", 10000+port)
}

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