Publish ITWorx Pulse source

internal/hostcollect/uptime.go

@@ -0,0 +1,34 @@
+package hostcollect
+
+import (
+	"fmt"
+	"math"
+	"strings"
+)
+
+// maxUptimeSeconds is the bound internal/host enforces (100 years). Rejecting here
+// keeps an implausible reading from failing normalization later, where the cause is
+// harder to see.
+const maxUptimeSeconds = 100 * 365 * 24 * 60 * 60
+
+// parseUptime reads the first field of /proc/uptime, the seconds since boot. The
+// second field (idle time summed over cores) is intentionally unused.
+func parseUptime(data []byte) (float64, error) {
+	fields := strings.Fields(string(data))
+	if len(fields) == 0 {
+		return 0, errBadUptime
+	}
+	seconds, ok := parseFloat(fields[0])
+	if !ok || seconds < 0 || seconds > maxUptimeSeconds || math.IsNaN(seconds) || math.IsInf(seconds, 0) {
+		return 0, errBadUptime
+	}
+	return seconds, nil
+}
+
+func (c *Collector) uptimeSeconds() (float64, error) {
+	data, err := readLimited(c.procPath("uptime"), maxProcessFileBytes)
+	if err != nil {
+		return 0, fmt.Errorf("hostcollect: read uptime: %w", err)
+	}
+	return parseUptime(data)
+}