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optinally gather cluster and index health stats

This commit is contained in:
JP 2015-10-27 22:31:25 -07:00 committed by Cameron Sparr
parent d2fb065d0d
commit cb8499c264
3 changed files with 209 additions and 18 deletions
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119
plugins/elasticsearch/elasticsearch.go
View File

@ -4,12 +4,14 @@ import (
"encoding/json"
"fmt"
"net/http"
"time"
"github.com/influxdb/telegraf/plugins"
)
const statsPath = "/_nodes/stats"
const statsPathLocal = "/_nodes/_local/stats"
const healthPath = "/_cluster/health"
type node struct {
Host string `json:"host"`
@ -27,6 +29,31 @@ type node struct {
Breakers interface{} `json:"breakers"`
}
type clusterHealth struct {
ClusterName string `json:"cluster_name"`
Status string `json:"status"`
TimedOut bool `json:"timed_out"`
NumberOfNodes int `json:"number_of_nodes"`
NumberOfDataNodes int `json:"number_of_data_nodes"`
ActivePrimaryShards int `json:"active_primary_shards"`
ActiveShards int `json:"active_shards"`
RelocatingShards int `json:"relocating_shards"`
InitializingShards int `json:"initializing_shards"`
UnassignedShards int `json:"unassigned_shards"`
Indices map[string]indexHealth `json:"indices"`
}
type indexHealth struct {
Status string `json:"status"`
NumberOfShards int `json:"number_of_shards"`
NumberOfReplicas int `json:"number_of_replicas"`
ActivePrimaryShards int `json:"active_primary_shards"`
ActiveShards int `json:"active_shards"`
RelocatingShards int `json:"relocating_shards"`
InitializingShards int `json:"initializing_shards"`
UnassignedShards int `json:"unassigned_shards"`
}
const sampleConfig = `
# specify a list of one or more Elasticsearch servers
servers = ["http://localhost:9200"]
@ -34,14 +61,18 @@ const sampleConfig = `
# set local to false when you want to read the indices stats from all nodes
# within the cluster
local = true
# set cluster_health to true when you want to also obtain cluster level stats
cluster_health = false
`
// Elasticsearch is a plugin to read stats from one or many Elasticsearch
// servers.
type Elasticsearch struct {
Local bool
Servers []string
client *http.Client
Local bool
Servers []string
ClusterHealth bool
client *http.Client
}
// NewElasticsearch return a new instance of Elasticsearch
@ -69,36 +100,30 @@ func (e *Elasticsearch) Gather(acc plugins.Accumulator) error {
} else {
url = serv + statsPath
}
if err := e.gatherUrl(url, acc); err != nil {
if err := e.gatherNodeStats(url, acc); err != nil {
return err
}
if e.ClusterHealth {
e.gatherClusterStats(fmt.Sprintf("%s/_cluster/health?level=indices", serv), acc)
}
}
return nil
}
func (e *Elasticsearch) gatherUrl(url string, acc plugins.Accumulator) error {
r, err := e.client.Get(url)
if err != nil {
return err
}
if r.StatusCode != http.StatusOK {
return fmt.Errorf("elasticsearch: API responded with status-code %d, expected %d", r.StatusCode, http.StatusOK)
}
d := json.NewDecoder(r.Body)
esRes := &struct {
func (e *Elasticsearch) gatherNodeStats(url string, acc plugins.Accumulator) error {
nodeStats := &struct {
ClusterName string `json:"cluster_name"`
Nodes map[string]*node `json:"nodes"`
}{}
if err = d.Decode(esRes); err != nil {
if err := e.gatherData(url, nodeStats); err != nil {
return err
}
for id, n := range esRes.Nodes {
for id, n := range nodeStats.Nodes {
tags := map[string]string{
"node_id": id,
"node_host": n.Host,
"node_name": n.Name,
"cluster_name": esRes.ClusterName,
"cluster_name": nodeStats.ClusterName,
}
for k, v := range n.Attributes {
@ -124,7 +149,65 @@ func (e *Elasticsearch) gatherUrl(url string, acc plugins.Accumulator) error {
}
}
}
return nil
}
func (e *Elasticsearch) gatherClusterStats(url string, acc plugins.Accumulator) error {
clusterStats := &clusterHealth{}
if err := e.gatherData(url, clusterStats); err != nil {
return err
}
measurementTime := time.Now()
clusterFields := map[string]interface{}{
"status": clusterStats.Status,
"timed_out": clusterStats.TimedOut,
"number_of_nodes": clusterStats.NumberOfNodes,
"number_of_data_nodes": clusterStats.NumberOfDataNodes,
"active_primary_shards": clusterStats.ActivePrimaryShards,
"active_shards": clusterStats.ActiveShards,
"relocating_shards": clusterStats.RelocatingShards,
"initializing_shards": clusterStats.InitializingShards,
"unassigned_shards": clusterStats.UnassignedShards,
}
acc.AddFields(
"cluster_health",
clusterFields,
map[string]string{"name": clusterStats.ClusterName},
measurementTime,
)
for name, health := range clusterStats.Indices {
indexFields := map[string]interface{}{
"status": health.Status,
"number_of_shards": health.NumberOfShards,
"number_of_replicas": health.NumberOfReplicas,
"active_primary_shards": health.ActivePrimaryShards,
"active_shards": health.ActiveShards,
"relocating_shards": health.RelocatingShards,
"initializing_shards": health.InitializingShards,
"unassigned_shards": health.UnassignedShards,
}
acc.AddFields(
"indices",
indexFields,
map[string]string{"index": name},
measurementTime,
)
}
return nil
}
func (e *Elasticsearch) gatherData(url string, v interface{}) error {
r, err := e.client.Get(url)
if err != nil {
return err
}
if r.StatusCode != http.StatusOK {
return fmt.Errorf("elasticsearch: API responded with status-code %d, expected %d", r.StatusCode, http.StatusOK)
}
if err = json.NewDecoder(r.Body).Decode(v); err != nil {
return err
}
return nil
}

37
plugins/elasticsearch/elasticsearch_test.go
View File

@ -8,6 +8,7 @@ import (
"github.com/influxdb/telegraf/testutil"
"github.com/stretchr/testify/assert"
"github.com/stretchr/testify/require"
)
type transportMock struct {
@ -70,3 +71,39 @@ func TestElasticsearch(t *testing.T) {
}
}
}
func TestGatherClusterStats(t *testing.T) {
es := NewElasticsearch()
es.Servers = []string{"http://example.com:9200"}
es.ClusterHealth = true
es.client.Transport = newTransportMock(http.StatusOK, clusterResponse)
var acc testutil.Accumulator
require.NoError(t, es.Gather(&acc))
var clusterHealthTests = []struct {
measurement string
fields map[string]interface{}
tags map[string]string
}{
{
"cluster_health",
clusterHealthExpected,
map[string]string{"name": "elasticsearch_telegraf"},
},
{
"indices",
v1IndexExpected,
map[string]string{"index": "v1"},
},
{
"indices",
v2IndexExpected,
map[string]string{"index": "v2"},
},
}
for _, exp := range clusterHealthTests {
assert.NoError(t, acc.ValidateTaggedFields(exp.measurement, exp.fields, exp.tags))
}
}

71
plugins/elasticsearch/testdata_test.go
View File

@ -1,5 +1,76 @@
package elasticsearch
const clusterResponse = `
{
"cluster_name": "elasticsearch_telegraf",
"status": "green",
"timed_out": false,
"number_of_nodes": 3,
"number_of_data_nodes": 3,
"active_primary_shards": 5,
"active_shards": 15,
"relocating_shards": 0,
"initializing_shards": 0,
"unassigned_shards": 0,
"indices": {
"v1": {
"status": "green",
"number_of_shards": 10,
"number_of_replicas": 1,
"active_primary_shards": 10,
"active_shards": 20,
"relocating_shards": 0,
"initializing_shards": 0,
"unassigned_shards": 0
},
"v2": {
"status": "red",
"number_of_shards": 10,
"number_of_replicas": 1,
"active_primary_shards": 0,
"active_shards": 0,
"relocating_shards": 0,
"initializing_shards": 0,
"unassigned_shards": 20
}
}
}
`
var clusterHealthExpected = map[string]interface{}{
"status": "green",
"timed_out": false,
"number_of_nodes": 3,
"number_of_data_nodes": 3,
"active_primary_shards": 5,
"active_shards": 15,
"relocating_shards": 0,
"initializing_shards": 0,
"unassigned_shards": 0,
}
var v1IndexExpected = map[string]interface{}{
"status": "green",
"number_of_shards": 10,
"number_of_replicas": 1,
"active_primary_shards": 10,
"active_shards": 20,
"relocating_shards": 0,
"initializing_shards": 0,
"unassigned_shards": 0,
}
var v2IndexExpected = map[string]interface{}{
"status": "red",
"number_of_shards": 10,
"number_of_replicas": 1,
"active_primary_shards": 0,
"active_shards": 0,
"relocating_shards": 0,
"initializing_shards": 0,
"unassigned_shards": 20,
}
const statsResponse = `
{
"cluster_name": "es-testcluster",