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docs: clarify getPublicENI function purpose #4

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leonardosul merged 1 commit into from
Feb 26, 2026
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docs: clarify getPublicENI function purpose #4

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3 changes: 3 additions & 0 deletions cmd/lambda/ec2ops.go
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Original file line number Diff line number Diff line change
Expand Up @@ -293,6 +293,9 @@ func (h *Handler) releaseEIPs(ctx context.Context, eips []ec2types.Address) {

// --- ENI helper ---

// getPublicENI returns the primary network interface (device index 0).
// For NAT instances launched via our templates, this is the public-facing ENI
// where the Elastic IP should be attached.
func getPublicENI(inst *Instance) *ec2types.InstanceNetworkInterface {
for i := range inst.NetworkInterfaces {
if aws.ToInt32(inst.NetworkInterfaces[i].Attachment.DeviceIndex) == 0 {
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