package elasticsearch import ( "encoding/json" "fmt" "io/ioutil" "net/http" "regexp" "strings" "sync" "time" "github.com/influxdata/telegraf" "github.com/influxdata/telegraf/internal" "github.com/influxdata/telegraf/internal/tls" "github.com/influxdata/telegraf/plugins/inputs" jsonparser "github.com/influxdata/telegraf/plugins/parsers/json" ) // mask for masking username/password from error messages var mask = regexp.MustCompile(`https?:\/\/\S+:\S+@`) // Nodestats are always generated, so simply define a constant for these endpoints const statsPath = "/_nodes/stats" const statsPathLocal = "/_nodes/_local/stats" type nodeStat struct { Host string `json:"host"` Name string `json:"name"` Attributes map[string]string `json:"attributes"` Indices interface{} `json:"indices"` OS interface{} `json:"os"` Process interface{} `json:"process"` JVM interface{} `json:"jvm"` ThreadPool interface{} `json:"thread_pool"` FS interface{} `json:"fs"` Transport interface{} `json:"transport"` HTTP interface{} `json:"http"` 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"` NumberOfPendingTasks int `json:"number_of_pending_tasks"` TaskMaxWaitingInQueueMillis int `json:"task_max_waiting_in_queue_millis"` ActiveShardsPercentAsNumber float64 `json:"active_shards_percent_as_number"` 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"` } type clusterStats struct { NodeName string `json:"node_name"` ClusterName string `json:"cluster_name"` Status string `json:"status"` Indices interface{} `json:"indices"` Nodes interface{} `json:"nodes"` } type catMaster struct { NodeID string `json:"id"` NodeIP string `json:"ip"` NodeName string `json:"node"` } const sampleConfig = ` ## specify a list of one or more Elasticsearch servers # you can add username and password to your url to use basic authentication: # servers = ["http://user:pass@localhost:9200"] servers = ["http://localhost:9200"] ## Timeout for HTTP requests to the elastic search server(s) http_timeout = "5s" ## When local is true (the default), the node will read only its own stats. ## Set local to false when you want to read the node stats from all nodes ## of the cluster. local = true ## Set cluster_health to true when you want to also obtain cluster health stats cluster_health = false ## Adjust cluster_health_level when you want to also obtain detailed health stats ## The options are ## - indices (default) ## - cluster # cluster_health_level = "indices" ## Set cluster_stats to true when you want to also obtain cluster stats from the ## Master node. cluster_stats = false ## node_stats is a list of sub-stats that you want to have gathered. Valid options ## are "indices", "os", "process", "jvm", "thread_pool", "fs", "transport", "http", ## "breaker". Per default, all stats are gathered. # node_stats = ["jvm", "http"] ## Optional TLS Config # tls_ca = "/etc/telegraf/ca.pem" # tls_cert = "/etc/telegraf/cert.pem" # tls_key = "/etc/telegraf/key.pem" ## Use TLS but skip chain & host verification # insecure_skip_verify = false ` // Elasticsearch is a plugin to read stats from one or many Elasticsearch // servers. type Elasticsearch struct { Local bool Servers []string HttpTimeout internal.Duration ClusterHealth bool ClusterHealthLevel string ClusterStats bool NodeStats []string tls.ClientConfig client *http.Client catMasterResponseTokens []string isMaster bool } // NewElasticsearch return a new instance of Elasticsearch func NewElasticsearch() *Elasticsearch { return &Elasticsearch{ HttpTimeout: internal.Duration{Duration: time.Second * 5}, ClusterHealthLevel: "indices", } } // perform status mapping func mapHealthStatusToCode(s string) int { switch strings.ToLower(s) { case "green": return 1 case "yellow": return 2 case "red": return 3 } return 0 } // SampleConfig returns sample configuration for this plugin. func (e *Elasticsearch) SampleConfig() string { return sampleConfig } // Description returns the plugin description. func (e *Elasticsearch) Description() string { return "Read stats from one or more Elasticsearch servers or clusters" } // Gather reads the stats from Elasticsearch and writes it to the // Accumulator. func (e *Elasticsearch) Gather(acc telegraf.Accumulator) error { if e.client == nil { client, err := e.createHttpClient() if err != nil { return err } e.client = client } var wg sync.WaitGroup wg.Add(len(e.Servers)) for _, serv := range e.Servers { go func(s string, acc telegraf.Accumulator) { defer wg.Done() url := e.nodeStatsUrl(s) e.isMaster = false if e.ClusterStats { // get cat/master information here so NodeStats can determine // whether this node is the Master if err := e.setCatMaster(s + "/_cat/master"); err != nil { acc.AddError(fmt.Errorf(mask.ReplaceAllString(err.Error(), "http(s)://XXX:XXX@"))) return } } // Always gather node states if err := e.gatherNodeStats(url, acc); err != nil { acc.AddError(fmt.Errorf(mask.ReplaceAllString(err.Error(), "http(s)://XXX:XXX@"))) return } if e.ClusterHealth { url = s + "/_cluster/health" if e.ClusterHealthLevel != "" { url = url + "?level=" + e.ClusterHealthLevel } if err := e.gatherClusterHealth(url, acc); err != nil { acc.AddError(fmt.Errorf(mask.ReplaceAllString(err.Error(), "http(s)://XXX:XXX@"))) return } } if e.ClusterStats && e.isMaster { if err := e.gatherClusterStats(s+"/_cluster/stats", acc); err != nil { acc.AddError(fmt.Errorf(mask.ReplaceAllString(err.Error(), "http(s)://XXX:XXX@"))) return } } }(serv, acc) } wg.Wait() return nil } func (e *Elasticsearch) createHttpClient() (*http.Client, error) { tlsCfg, err := e.ClientConfig.TLSConfig() if err != nil { return nil, err } tr := &http.Transport{ ResponseHeaderTimeout: e.HttpTimeout.Duration, TLSClientConfig: tlsCfg, } client := &http.Client{ Transport: tr, Timeout: e.HttpTimeout.Duration, } return client, nil } func (e *Elasticsearch) nodeStatsUrl(baseUrl string) string { var url string if e.Local { url = baseUrl + statsPathLocal } else { url = baseUrl + statsPath } if len(e.NodeStats) == 0 { return url } return fmt.Sprintf("%s/%s", url, strings.Join(e.NodeStats, ",")) } func (e *Elasticsearch) gatherNodeStats(url string, acc telegraf.Accumulator) error { nodeStats := &struct { ClusterName string `json:"cluster_name"` Nodes map[string]*nodeStat `json:"nodes"` }{} if err := e.gatherJsonData(url, nodeStats); err != nil { return err } for id, n := range nodeStats.Nodes { tags := map[string]string{ "node_id": id, "node_host": n.Host, "node_name": n.Name, "cluster_name": nodeStats.ClusterName, } if e.ClusterStats { // check for master e.isMaster = (id == e.catMasterResponseTokens[0]) } for k, v := range n.Attributes { tags["node_attribute_"+k] = v } stats := map[string]interface{}{ "indices": n.Indices, "os": n.OS, "process": n.Process, "jvm": n.JVM, "thread_pool": n.ThreadPool, "fs": n.FS, "transport": n.Transport, "http": n.HTTP, "breakers": n.Breakers, } now := time.Now() for p, s := range stats { // if one of the individual node stats is not even in the // original result if s == nil { continue } f := jsonparser.JSONFlattener{} // parse Json, ignoring strings and bools err := f.FlattenJSON("", s) if err != nil { return err } acc.AddFields("elasticsearch_"+p, f.Fields, tags, now) } } return nil } func (e *Elasticsearch) gatherClusterHealth(url string, acc telegraf.Accumulator) error { healthStats := &clusterHealth{} if err := e.gatherJsonData(url, healthStats); err != nil { return err } measurementTime := time.Now() clusterFields := map[string]interface{}{ "status": healthStats.Status, "status_code": mapHealthStatusToCode(healthStats.Status), "timed_out": healthStats.TimedOut, "number_of_nodes": healthStats.NumberOfNodes, "number_of_data_nodes": healthStats.NumberOfDataNodes, "active_primary_shards": healthStats.ActivePrimaryShards, "active_shards": healthStats.ActiveShards, "relocating_shards": healthStats.RelocatingShards, "initializing_shards": healthStats.InitializingShards, "unassigned_shards": healthStats.UnassignedShards, "number_of_pending_tasks": healthStats.NumberOfPendingTasks, "task_max_waiting_in_queue_millis": healthStats.TaskMaxWaitingInQueueMillis, "active_shards_percent_as_number": healthStats.ActiveShardsPercentAsNumber, } acc.AddFields( "elasticsearch_cluster_health", clusterFields, map[string]string{"name": healthStats.ClusterName}, measurementTime, ) for name, health := range healthStats.Indices { indexFields := map[string]interface{}{ "status": health.Status, "status_code": mapHealthStatusToCode(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( "elasticsearch_indices", indexFields, map[string]string{"index": name}, measurementTime, ) } return nil } func (e *Elasticsearch) gatherClusterStats(url string, acc telegraf.Accumulator) error { clusterStats := &clusterStats{} if err := e.gatherJsonData(url, clusterStats); err != nil { return err } now := time.Now() tags := map[string]string{ "node_name": clusterStats.NodeName, "cluster_name": clusterStats.ClusterName, "status": clusterStats.Status, } stats := map[string]interface{}{ "nodes": clusterStats.Nodes, "indices": clusterStats.Indices, } for p, s := range stats { f := jsonparser.JSONFlattener{} // parse json, including bools and strings err := f.FullFlattenJSON("", s, true, true) if err != nil { return err } acc.AddFields("elasticsearch_clusterstats_"+p, f.Fields, tags, now) } return nil } func (e *Elasticsearch) setCatMaster(url string) error { r, err := e.client.Get(url) if err != nil { return err } defer r.Body.Close() if r.StatusCode != http.StatusOK { // NOTE: we are not going to read/discard r.Body under the assumption we'd prefer // to let the underlying transport close the connection and re-establish a new one for // future calls. return fmt.Errorf("elasticsearch: Unable to retrieve master node information. API responded with status-code %d, expected %d", r.StatusCode, http.StatusOK) } response, err := ioutil.ReadAll(r.Body) if err != nil { return err } e.catMasterResponseTokens = strings.Split(string(response), " ") return nil } func (e *Elasticsearch) gatherJsonData(url string, v interface{}) error { r, err := e.client.Get(url) if err != nil { return err } defer r.Body.Close() if r.StatusCode != http.StatusOK { // NOTE: we are not going to read/discard r.Body under the assumption we'd prefer // to let the underlying transport close the connection and re-establish a new one for // future calls. 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 } func init() { inputs.Add("elasticsearch", func() telegraf.Input { return NewElasticsearch() }) }