131 lines
3.1 KiB
Go
131 lines
3.1 KiB
Go
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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Name string `json:"name"`
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Attributes map[string]string `json:"attributes"`
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Indices 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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if r.StatusCode != http.StatusOK {
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return fmt.Errorf("elasticsearch: API responded with status-code %d, expected %d", r.StatusCode, http.StatusOK)
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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 id, n := range esRes.Nodes {
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tags := map[string]string{
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"node_id": id,
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"node_host": n.Host,
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"node_name": n.Name,
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"cluster_name": esRes.ClusterName,
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}
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for k, v := range n.Attributes {
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tags["node_attribute_"+k] = v
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}
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if err := e.parseInterface(acc, "indices", tags, n.Indices); 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) parseInterface(acc plugins.Accumulator, prefix string, tags map[string]string, v interface{}) error {
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switch t := v.(type) {
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case map[string]interface{}:
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for k, v := range t {
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if err := e.parseInterface(acc, prefix+"_"+k, tags, v); err != nil {
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return err
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}
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}
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case float64:
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acc.Add(prefix, t, tags)
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case bool, string:
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// ignored bool and string
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return nil
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default:
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return fmt.Errorf("elasticsearch: got unexpected type %T with value %v (%s)", t, t, prefix)
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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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