/
snmpConnectorModel.go
234 lines (201 loc) · 7.66 KB
/
snmpConnectorModel.go
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package main
import (
"fmt"
"strings"
"time"
"github.com/gwos/tcg/connectors"
"github.com/gwos/tcg/connectors/snmp-connector/clients"
"github.com/gwos/tcg/connectors/snmp-connector/utils"
"github.com/gwos/tcg/sdk/transit"
"github.com/patrickmn/go-cache"
"github.com/rs/zerolog/log"
)
// FiveMinutes NeDi interval in seconds
const FiveMinutes = 300
// PreviousValueCache cache to handle "Delta" metrics
var previousValueCache = cache.New(-1, -1)
type MonitoringState struct {
// [deviceName]Device
devices map[string]DeviceExt
}
type DeviceExt struct {
clients.Device
SecData *utils.SecurityData
// [ifIdx]Interface
Interfaces map[int]InterfaceExt
}
type InterfaceExt struct {
clients.Interface
// [mib]InterfaceMetric
Metrics map[string]InterfaceMetric
}
type InterfaceMetric struct {
Key string
Mib string
Value int64
}
func (state *MonitoringState) Init() {
state.devices = make(map[string]DeviceExt)
}
func (state *MonitoringState) retrieveMonitoredResources(metricDefinitions map[string]transit.MetricDefinition) []transit.MonitoredResource {
mResources := make([]transit.MonitoredResource, 0, len(state.devices))
for _, device := range state.devices {
mServices := device.retrieveMonitoredServices(metricDefinitions)
mResource, err := connectors.CreateResource(device.Name, mServices)
if err != nil {
log.Err(err).Msgf("could not create monitored resource '%s'", device.Name)
continue
}
mResource.Status = calculateHostStatus(device.LastOK)
mResources = append(mResources, *mResource)
}
// log.Debug().
// Interface("devices", state.devices).
// Interface("metricDefinitions", metricDefinitions).
// Interface("mResources", mResources).
// Msg("__ retrieveMonitoredResources")
return mResources
}
func (device *DeviceExt) retrieveMonitoredServices(metricDefinitions map[string]transit.MetricDefinition) []transit.MonitoredService {
mServices := make([]transit.MonitoredService, 0, len(device.Interfaces))
if metricDefinitions == nil {
return mServices
}
timestamp := transit.NewTimestamp()
for _, iFace := range device.Interfaces {
var bytesInPrev, bytesOutPrev, bytesInX64Prev, bytesOutX64Prev int64 = -1, -1, -1, -1
if val, ok := previousValueCache.Get(fmt.Sprintf("%s:%s:%s", device.Name, iFace.Name, clients.IfInOctets)); ok {
bytesInPrev = val.(int64)
}
if val, ok := previousValueCache.Get(fmt.Sprintf("%s:%s:%s", device.Name, iFace.Name, clients.IfOutOctets)); ok {
bytesOutPrev = val.(int64)
}
if val, ok := previousValueCache.Get(fmt.Sprintf("%s:%s:%s", device.Name, iFace.Name, clients.IfHCInOctets)); ok {
bytesInX64Prev = val.(int64)
}
if val, ok := previousValueCache.Get(fmt.Sprintf("%s:%s:%s", device.Name, iFace.Name, clients.IfHCOutOctets)); ok {
bytesOutX64Prev = val.(int64)
}
var metricsBuilder []connectors.MetricBuilder
for mib, metric := range iFace.Metrics {
if metricDefinition, has := metricDefinitions[metric.Mib]; has {
var unitType transit.UnitType
var value interface{}
unitType = transit.UnitCounter
value = metric.Value
switch mib {
case clients.IfInOctets, clients.IfOutOctets, clients.IfHCInOctets, clients.IfHCOutOctets:
value = metric.Value * 8
}
metricBuilder := connectors.MetricBuilder{
Name: metric.Key,
CustomName: metricDefinition.CustomName,
ComputeType: metricDefinition.ComputeType,
Expression: metricDefinition.Expression,
UnitType: unitType,
Warning: metricDefinition.WarningThreshold,
Critical: metricDefinition.CriticalThreshold,
StartTimestamp: timestamp,
EndTimestamp: timestamp,
Graphed: metricDefinition.Graphed,
Value: nil,
}
ck := fmt.Sprintf("%s:%s:%s", device.Name, iFace.Name, mib)
isDelta, isPreviousPresent, valueToSet := calculateValue(metricDefinition.MetricType, unitType,
ck, value)
if !isDelta || (isDelta && isPreviousPresent) {
metricBuilder.Value = valueToSet
metricsBuilder = append(metricsBuilder, metricBuilder)
}
previousValueCache.SetDefault(ck, metric.Value)
// log.Debug().
// Interface("_ck", ck).
// Interface("_isDelta", isDelta).
// Interface("_isPreviousPresent", isPreviousPresent).
// Interface("_valueToSet", valueToSet).
// Interface("metricsBuilder", metricsBuilder).
// Msg("__ ck")
}
}
for key := range clients.NonMibMetrics {
if metricDefinition, has := metricDefinitions[key]; has {
switch key {
case clients.BytesPerSecondIn:
metricBuilder := calculateBytesPerSecond(key, metricDefinition,
iFace.Metrics[clients.IfInOctets].Value*8, iFace.Metrics[clients.IfHCInOctets].Value*8, bytesInPrev, bytesInX64Prev, timestamp)
metricsBuilder = append(metricsBuilder, metricBuilder)
case clients.BytesPerSecondOut:
metricBuilder := calculateBytesPerSecond(key, metricDefinition,
iFace.Metrics[clients.IfOutOctets].Value*8, iFace.Metrics[clients.IfHCOutOctets].Value*8, bytesOutPrev, bytesOutX64Prev, timestamp)
metricsBuilder = append(metricsBuilder, metricBuilder)
}
}
}
mService, err := connectors.BuildServiceForMetrics(iFace.Name, device.Name, metricsBuilder)
if err != nil {
log.Err(err).Msgf("could not create monitored service '%s:%s'", device.Name, iFace.Name)
}
if mService != nil {
switch iFace.Status {
case 0:
mService.Status = transit.ServiceWarning
mService.LastPluginOutput = "Interface Operational State is DOWN, Administrative state is DOWN"
case 1:
mService.Status = transit.ServiceUnscheduledCritical
mService.LastPluginOutput = "Interface Operational State is DOWN, Administrative state is UP"
case 2:
mService.Status = transit.ServiceWarning
mService.LastPluginOutput = "Interface Operational State is UP, Administrative state is DOWN"
case 3:
mService.Status = transit.ServiceOk
mService.LastPluginOutput = "Interface Operational State is UP, Administrative state is UP"
case -1:
}
mServices = append(mServices, *mService)
}
}
return mServices
}
func calculateHostStatus(lastOk float64) transit.MonitorStatus {
now := time.Now().Unix() // in seconds
if (float64(now) - lastOk) < FiveMinutes {
return transit.HostUp
}
return transit.HostUnreachable
}
func calculateValue(metricKind transit.MetricKind, unitType transit.UnitType,
metricName string, currentValue interface{}) (bool, bool, interface{}) {
if strings.EqualFold(string(metricKind), string(transit.Delta)) {
if previousValue, present := previousValueCache.Get(metricName); present {
switch unitType {
case transit.UnitCounter:
previousValueCache.SetDefault(metricName, currentValue.(int64))
currentValue = currentValue.(int64) - previousValue.(int64)
}
return true, true, currentValue.(int64)
}
return true, false, currentValue.(int64)
}
return false, false, currentValue.(int64)
}
func calculateBytesPerSecond(metricName string, metricDefinition transit.MetricDefinition, current, currentX64, previous,
previousX64 int64, timestamp *transit.Timestamp) connectors.MetricBuilder {
seconds := int(connectors.CheckInterval.Seconds())
result := (current - previous) / int64(seconds)
if currentX64 > 0 && previousX64 > 0 {
result = (currentX64 - previousX64) / int64(seconds)
}
return connectors.MetricBuilder{
Name: metricName,
CustomName: metricDefinition.CustomName,
ComputeType: metricDefinition.ComputeType,
Expression: metricDefinition.Expression,
UnitType: transit.UnitCounter,
Warning: metricDefinition.WarningThreshold,
Critical: metricDefinition.CriticalThreshold,
StartTimestamp: timestamp,
EndTimestamp: timestamp,
Graphed: metricDefinition.Graphed,
Value: result,
}
}