109 lines
2.5 KiB
Go
109 lines
2.5 KiB
Go
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package elasticsearch
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import (
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"encoding/json"
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"fmt"
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"net/http"
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"github.com/influxdb/telegraf/plugins"
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)
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const indicesStatsPath = "/_nodes/stats/indices"
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const indicesStatsPathLocal = "/_nodes/_local/stats/indices"
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type node struct {
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Host string `json:"host"`
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Indices map[string]map[string]interface{} `json:"indices"`
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}
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const sampleConfig = `
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# specify a list of one or more Elasticsearch servers
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servers = ["http://localhost:9200"]
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#
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# set local to false when you want to read the indices stats from all nodes
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# within the cluster
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local = true
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`
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// Elasticsearch is a plugin to read stats from one or many Elasticsearch
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// servers.
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type Elasticsearch struct {
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Local bool
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Servers []string
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client *http.Client
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}
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// NewElasticsearch return a new instance of Elasticsearch
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func NewElasticsearch() *Elasticsearch {
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return &Elasticsearch{client: http.DefaultClient}
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}
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// SampleConfig returns sample configuration for this plugin.
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func (e *Elasticsearch) SampleConfig() string {
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return sampleConfig
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}
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// Description returns the plugin description.
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func (e *Elasticsearch) Description() string {
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return "Read indices stats from one or more Elasticsearch servers or clusters"
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}
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// Gather reads the stats from Elasticsearch and writes it to the
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// Accumulator.
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func (e *Elasticsearch) Gather(acc plugins.Accumulator) error {
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for _, serv := range e.Servers {
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var url string
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if e.Local {
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url = serv + indicesStatsPathLocal
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} else {
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url = serv + indicesStatsPath
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}
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if err := e.gatherUrl(url, acc); err != nil {
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return err
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}
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}
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return nil
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}
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func (e *Elasticsearch) gatherUrl(url string, acc plugins.Accumulator) error {
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r, err := e.client.Get(url)
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if err != nil {
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return err
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}
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d := json.NewDecoder(r.Body)
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esRes := &struct {
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ClusterName string `json:"cluster_name"`
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Nodes map[string]*node `json:"nodes"`
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}{}
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if err = d.Decode(esRes); err != nil {
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return err
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}
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for _, n := range esRes.Nodes {
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tags := map[string]string{
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"node_host": n.Host,
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"cluster_name": esRes.ClusterName,
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}
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for group, stats := range n.Indices {
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for statName, value := range stats {
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floatVal, ok := value.(float64)
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if !ok {
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// there are a couple of values that we can't cast to float,
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// this is fine :-)
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continue
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}
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acc.Add(fmt.Sprintf("indices_%s_%s", group, statName), int(floatVal), tags)
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}
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}
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}
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return nil
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}
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func init() {
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plugins.Add("elasticsearch", func() plugins.Plugin {
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return NewElasticsearch()
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})
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}
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