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26 lines
589 B
26 lines
589 B
package serial
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import "time"
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// Allow several normal four-second sweeps to recover from a slow/noisy reply.
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// After a confirmed UP, sustained response loss is reported as DOWN.
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const CRResponseGracePeriod = 15 * time.Second
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func CRConnectionStatus(probe CRProbeState, now time.Time) string {
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if !probe.Enabled {
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return "unknown"
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}
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if probe.Up {
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return "up"
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}
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if probe.EverUp && probe.LastResponseAt != nil {
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age := now.Sub(*probe.LastResponseAt)
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if age >= 0 && age <= CRResponseGracePeriod {
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return "up"
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}
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}
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if probe.EverUp {
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return "down"
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}
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return "unknown"
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}
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