mirror of
https://github.com/prometheus-community/windows_exporter
synced 2025-02-16 20:17:10 +00:00
c156f2bcbe
If an WMI query were to return an empty result set, trying to access the first element in the result set would result in a `panic: runtime error: index out of range` error. add logic to explicitly check if the result set size is 0 and return an error rather. Fixes https://github.com/martinlindhe/wmi_exporter/issues/240
83 lines
1.9 KiB
Go
83 lines
1.9 KiB
Go
// returns data points from Win32_ComputerSystem
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// https://msdn.microsoft.com/en-us/library/aa394102 - Win32_ComputerSystem class
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package collector
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import (
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"errors"
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"github.com/StackExchange/wmi"
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"github.com/prometheus/client_golang/prometheus"
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"github.com/prometheus/common/log"
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)
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func init() {
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Factories["cs"] = NewCSCollector
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}
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// A CSCollector is a Prometheus collector for WMI metrics
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type CSCollector struct {
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PhysicalMemoryBytes *prometheus.Desc
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LogicalProcessors *prometheus.Desc
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}
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// NewCSCollector ...
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func NewCSCollector() (Collector, error) {
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const subsystem = "cs"
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return &CSCollector{
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LogicalProcessors: prometheus.NewDesc(
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prometheus.BuildFQName(Namespace, subsystem, "logical_processors"),
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"ComputerSystem.NumberOfLogicalProcessors",
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nil,
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nil,
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),
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PhysicalMemoryBytes: prometheus.NewDesc(
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prometheus.BuildFQName(Namespace, subsystem, "physical_memory_bytes"),
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"ComputerSystem.TotalPhysicalMemory",
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nil,
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nil,
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),
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}, nil
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}
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// Collect sends the metric values for each metric
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// to the provided prometheus Metric channel.
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func (c *CSCollector) Collect(ch chan<- prometheus.Metric) error {
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if desc, err := c.collect(ch); err != nil {
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log.Error("failed collecting cs metrics:", desc, err)
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return err
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}
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return nil
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}
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type Win32_ComputerSystem struct {
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NumberOfLogicalProcessors uint32
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TotalPhysicalMemory uint64
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}
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func (c *CSCollector) collect(ch chan<- prometheus.Metric) (*prometheus.Desc, error) {
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var dst []Win32_ComputerSystem
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q := queryAll(&dst)
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if err := wmi.Query(q, &dst); err != nil {
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return nil, err
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}
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if len(dst) == 0 {
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return nil, errors.New("WMI query returned empty result set")
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}
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ch <- prometheus.MustNewConstMetric(
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c.LogicalProcessors,
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prometheus.GaugeValue,
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float64(dst[0].NumberOfLogicalProcessors),
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)
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ch <- prometheus.MustNewConstMetric(
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c.PhysicalMemoryBytes,
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prometheus.GaugeValue,
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float64(dst[0].TotalPhysicalMemory),
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)
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return nil, nil
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}
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