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healthcheck.go
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healthcheck.go
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package sss
import (
"github.com/cybozu-go/log"
"github.com/cybozu-go/sabakan/v2"
dto "github.com/prometheus/client_model/go"
)
const (
monitorHWStatusOK = 0
monitorHWStatusWarning = 1
monitorHWStatusCritical = 2
monitorHWStatusNull = -1
)
const doNotChangeState = sabakan.MachineState("")
// machineStateSource is a struct of machine state collection
type machineStateSource struct {
serial string
ipv4 string
serfStatus *serfStatus
machineType *machineType
metrics map[string]*dto.MetricFamily
}
func newMachineStateSource(m *machine, serfStatuses map[string]*serfStatus, machineTypes map[string]*machineType) *machineStateSource {
return &machineStateSource{
serial: m.Serial,
ipv4: m.IPv4Addr,
serfStatus: serfStatuses[m.IPv4Addr],
machineType: machineTypes[m.Type],
}
}
func (mss *machineStateSource) decideMachineStateCandidate() sabakan.MachineState {
if mss.serfStatus == nil {
log.Info("unreachable; serf status is nil", map[string]interface{}{
"serial": mss.serial,
"ipv4": mss.ipv4,
})
return sabakan.StateUnreachable
}
if mss.serfStatus.Status != "alive" {
log.Info("unreachable; serf status != alive", map[string]interface{}{
"serial": mss.serial,
"ipv4": mss.ipv4,
"status": mss.serfStatus.Status,
})
return sabakan.StateUnreachable
}
if mss.serfStatus.SystemdUnitsFailed != nil && *mss.serfStatus.SystemdUnitsFailed != "" {
log.Info("unhealthy; some systemd units failed", map[string]interface{}{
"serial": mss.serial,
"ipv4": mss.ipv4,
"failed": *mss.serfStatus.SystemdUnitsFailed,
})
return sabakan.StateUnhealthy
}
state := mss.decideByMonitorHW()
if state != sabakan.StateHealthy {
return state
}
if mss.serfStatus.SystemdUnitsFailed == nil {
// Do nothing if there is no systemd-units-failed tag and no hardware failure.
// In this case, the machine is starting up.
return doNotChangeState
}
return sabakan.StateHealthy
}
func (mss *machineStateSource) decideByMonitorHW() sabakan.MachineState {
if mss.machineType == nil {
log.Info("unhealthy; machine type is nil", map[string]interface{}{
"serial": mss.serial,
"ipv4": mss.ipv4,
})
return sabakan.StateUnhealthy
}
if len(mss.machineType.MetricsCheckList) == 0 {
return sabakan.StateHealthy
}
if mss.metrics == nil {
log.Info("unhealthy; metrics is nil", map[string]interface{}{
"serial": mss.serial,
"ipv4": mss.ipv4,
})
return sabakan.StateUnhealthy
}
for _, checkTarget := range mss.machineType.MetricsCheckList {
_, ok := mss.metrics[checkTarget.Name]
if !ok {
log.Info("unhealthy; metrics do not contain check target", map[string]interface{}{
"serial": mss.serial,
"ipv4": mss.ipv4,
"target": checkTarget.Name,
})
return sabakan.StateUnhealthy
}
res := mss.checkTarget(checkTarget)
if res != sabakan.StateHealthy {
return res
}
}
return sabakan.StateHealthy
}
func (mss *machineStateSource) checkTarget(target targetMetric) sabakan.MachineState {
mf := mss.metrics[target.Name]
matched := target.Selector.Match(mf)
if len(matched) == 0 {
log.Info("unhealthy; metric with specified labels does not exist", map[string]interface{}{
"serial": mss.serial,
"ipv4": mss.ipv4,
"name": target.Name,
"selector": target.Selector,
})
return sabakan.StateUnhealthy
}
var healthyCount int
for _, m := range matched {
gauge := m.GetGauge()
if gauge == nil {
continue
}
if gauge.GetValue() == monitorHWStatusOK {
healthyCount++
continue
}
log.Info("unhealthy; metric is not healthy", map[string]interface{}{
"serial": mss.serial,
"ipv4": mss.ipv4,
"name": target.Name,
"labels": m.Label,
"value": gauge.GetValue(),
})
}
if target.MinimumHealthyCount == nil {
if healthyCount != len(matched) {
log.Info("unhealthy; one or more metric is not healthy", map[string]interface{}{
"serial": mss.serial,
"ipv4": mss.ipv4,
"name": target.Name,
"selector": target.Selector,
"num_metrics": len(matched),
"healthy_count": healthyCount,
})
return sabakan.StateUnhealthy
}
log.Info("healthy;", map[string]interface{}{
"serial": mss.serial,
"ipv4": mss.ipv4,
"name": target.Name,
"selector": target.Selector,
})
return sabakan.StateHealthy
}
minCount := *target.MinimumHealthyCount
if healthyCount < minCount {
log.Info("unhealthy; minimum healthy count is not satisfied", map[string]interface{}{
"serial": mss.serial,
"ipv4": mss.ipv4,
"name": target.Name,
"selector": target.Selector,
"minimum_healthy_count": minCount,
"healthy_count": healthyCount,
})
return sabakan.StateUnhealthy
}
log.Info("healthy;", map[string]interface{}{
"serial": mss.serial,
"ipv4": mss.ipv4,
"name": target.Name,
"selector": target.Selector,
})
return sabakan.StateHealthy
}