telegraf/plugins/inputs/kube_inventory/kube_state.go

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package kube_inventory
import (
"context"
"fmt"
"io/ioutil"
"log"
"strconv"
"strings"
"sync"
"time"
"github.com/kubernetes/apimachinery/pkg/api/resource"
"github.com/influxdata/telegraf"
"github.com/influxdata/telegraf/filter"
"github.com/influxdata/telegraf/internal"
"github.com/influxdata/telegraf/internal/tls"
"github.com/influxdata/telegraf/plugins/inputs"
)
// KubernetesInventory represents the config object for the plugin.
type KubernetesInventory struct {
URL string `toml:"url"`
BearerToken string `toml:"bearer_token"`
BearerTokenString string `toml:"bearer_token_string"`
Namespace string `toml:"namespace"`
ResponseTimeout internal.Duration `toml:"response_timeout"` // Timeout specified as a string - 3s, 1m, 1h
ResourceExclude []string `toml:"resource_exclude"`
ResourceInclude []string `toml:"resource_include"`
MaxConfigMapAge internal.Duration `toml:"max_config_map_age"`
tls.ClientConfig
client *client
}
var sampleConfig = `
## URL for the Kubernetes API
url = "https://127.0.0.1"
## Namespace to use
# namespace = "default"
## Use bearer token for authorization. ('bearer_token' takes priority)
# bearer_token = "/path/to/bearer/token"
## OR
# bearer_token_string = "abc_123"
## Set response_timeout (default 5 seconds)
# response_timeout = "5s"
## Optional Resources to exclude from gathering
## Leave them with blank with try to gather everything available.
## Values can be - "daemonsets", deployments", "nodes", "persistentvolumes",
## "persistentvolumeclaims", "pods", "statefulsets"
# resource_exclude = [ "deployments", "nodes", "statefulsets" ]
## Optional Resources to include when gathering
## Overrides resource_exclude if both set.
# resource_include = [ "deployments", "nodes", "statefulsets" ]
## Optional TLS Config
# tls_ca = "/path/to/cafile"
# tls_cert = "/path/to/certfile"
# tls_key = "/path/to/keyfile"
## Use TLS but skip chain & host verification
# insecure_skip_verify = false
`
// SampleConfig returns a sample config
func (ki *KubernetesInventory) SampleConfig() string {
return sampleConfig
}
// Description returns the description of this plugin
func (ki *KubernetesInventory) Description() string {
return "Read metrics from the Kubernetes api"
}
// Gather collects kubernetes metrics from a given URL.
func (ki *KubernetesInventory) Gather(acc telegraf.Accumulator) (err error) {
if ki.client == nil {
if ki.client, err = ki.initClient(); err != nil {
return err
}
}
resourceFilter, err := filter.NewIncludeExcludeFilter(ki.ResourceInclude, ki.ResourceExclude)
if err != nil {
return err
}
wg := sync.WaitGroup{}
ctx := context.Background()
for collector, f := range availableCollectors {
if resourceFilter.Match(collector) {
wg.Add(1)
go func(f func(ctx context.Context, acc telegraf.Accumulator, k *KubernetesInventory)) {
defer wg.Done()
f(ctx, acc, ki)
}(f)
}
}
wg.Wait()
return nil
}
var availableCollectors = map[string]func(ctx context.Context, acc telegraf.Accumulator, ki *KubernetesInventory){
"daemonsets": collectDaemonSets,
"deployments": collectDeployments,
"nodes": collectNodes,
"persistentvolumes": collectPersistentVolumes,
"persistentvolumeclaims": collectPersistentVolumeClaims,
"pods": collectPods,
"statefulsets": collectStatefulSets,
}
func (ki *KubernetesInventory) initClient() (*client, error) {
if ki.BearerToken != "" {
token, err := ioutil.ReadFile(ki.BearerToken)
if err != nil {
return nil, err
}
ki.BearerTokenString = strings.TrimSpace(string(token))
}
return newClient(ki.URL, ki.Namespace, ki.BearerTokenString, ki.ResponseTimeout.Duration, ki.ClientConfig)
}
func atoi(s string) int64 {
i, err := strconv.ParseInt(s, 10, 64)
if err != nil {
return 0
}
return int64(i)
}
func convertQuantity(s string, m float64) int64 {
q, err := resource.ParseQuantity(s)
if err != nil {
log.Printf("E! Failed to parse quantity - %v", err)
return 0
}
f, err := strconv.ParseFloat(fmt.Sprint(q.AsDec()), 64)
if err != nil {
log.Printf("E! Failed to parse float - %v", err)
return 0
}
if m < 1 {
m = 1
}
return int64(f * m)
}
var (
daemonSetMeasurement = "kubernetes_daemonset"
deploymentMeasurement = "kubernetes_deployment"
nodeMeasurement = "kubernetes_node"
persistentVolumeMeasurement = "kubernetes_persistentvolume"
persistentVolumeClaimMeasurement = "kubernetes_persistentvolumeclaim"
podContainerMeasurement = "kubernetes_pod_container"
statefulSetMeasurement = "kubernetes_statefulset"
)
func init() {
inputs.Add("kube_inventory", func() telegraf.Input {
return &KubernetesInventory{
ResponseTimeout: internal.Duration{Duration: time.Second * 5},
Namespace: "default",
}
})
}