package influxdb import ( "errors" "fmt" "log" "math/rand" "net/url" "strings" "time" "github.com/influxdata/telegraf" "github.com/influxdata/telegraf/internal" "github.com/influxdata/telegraf/plugins/outputs" "github.com/influxdata/influxdb/client/v2" ) type InfluxDB struct { // URL is only for backwards compatability URL string URLs []string `toml:"urls"` Username string Password string Database string UserAgent string Precision string RetentionPolicy string Timeout internal.Duration UDPPayload int `toml:"udp_payload"` // Path to CA file SSLCA string `toml:"ssl_ca"` // Path to host cert file SSLCert string `toml:"ssl_cert"` // Path to cert key file SSLKey string `toml:"ssl_key"` // Use SSL but skip chain & host verification InsecureSkipVerify bool conns []client.Client } var sampleConfig = ` ## The full HTTP or UDP endpoint URL for your InfluxDB instance. ## Multiple urls can be specified as part of the same cluster, ## this means that only ONE of the urls will be written to each interval. # urls = ["udp://localhost:8089"] # UDP endpoint example urls = ["http://localhost:8086"] # required ## The target database for metrics (telegraf will create it if not exists). database = "telegraf" # required ## Retention policy to write to. retention_policy = "default" ## Precision of writes, valid values are "ns", "us" (or "µs"), "ms", "s", "m", "h". ## note: using "s" precision greatly improves InfluxDB compression. precision = "s" ## Write timeout (for the InfluxDB client), formatted as a string. ## If not provided, will default to 5s. 0s means no timeout (not recommended). timeout = "5s" # username = "telegraf" # password = "metricsmetricsmetricsmetrics" ## Set the user agent for HTTP POSTs (can be useful for log differentiation) # user_agent = "telegraf" ## Set UDP payload size, defaults to InfluxDB UDP Client default (512 bytes) # udp_payload = 512 ## Optional SSL Config # ssl_ca = "/etc/telegraf/ca.pem" # ssl_cert = "/etc/telegraf/cert.pem" # ssl_key = "/etc/telegraf/key.pem" ## Use SSL but skip chain & host verification # insecure_skip_verify = false ` func (i *InfluxDB) Connect() error { var urls []string for _, u := range i.URLs { urls = append(urls, u) } // Backward-compatability with single Influx URL config files // This could eventually be removed in favor of specifying the urls as a list if i.URL != "" { urls = append(urls, i.URL) } tlsCfg, err := internal.GetTLSConfig( i.SSLCert, i.SSLKey, i.SSLCA, i.InsecureSkipVerify) if err != nil { return err } var conns []client.Client for _, u := range urls { switch { case strings.HasPrefix(u, "udp"): parsed_url, err := url.Parse(u) if err != nil { return err } if i.UDPPayload == 0 { i.UDPPayload = client.UDPPayloadSize } c, err := client.NewUDPClient(client.UDPConfig{ Addr: parsed_url.Host, PayloadSize: i.UDPPayload, }) if err != nil { return err } conns = append(conns, c) default: // If URL doesn't start with "udp", assume HTTP client c, err := client.NewHTTPClient(client.HTTPConfig{ Addr: u, Username: i.Username, Password: i.Password, UserAgent: i.UserAgent, Timeout: i.Timeout.Duration, TLSConfig: tlsCfg, }) if err != nil { return err } // Create Database if it doesn't exist _, e := c.Query(client.Query{ Command: fmt.Sprintf("CREATE DATABASE IF NOT EXISTS %s", i.Database), }) if e != nil { log.Println("Database creation failed: " + e.Error()) continue } conns = append(conns, c) } } i.conns = conns rand.Seed(time.Now().UnixNano()) return nil } func (i *InfluxDB) Close() error { // InfluxDB client does not provide a Close() function return nil } func (i *InfluxDB) SampleConfig() string { return sampleConfig } func (i *InfluxDB) Description() string { return "Configuration for influxdb server to send metrics to" } // Choose a random server in the cluster to write to until a successful write // occurs, logging each unsuccessful. If all servers fail, return error. func (i *InfluxDB) Write(metrics []telegraf.Metric) error { if len(i.conns) == 0 { err := i.Connect() if err != nil { return err } } bp, err := client.NewBatchPoints(client.BatchPointsConfig{ Database: i.Database, Precision: i.Precision, RetentionPolicy: i.RetentionPolicy, }) if err != nil { return err } for _, metric := range metrics { bp.AddPoint(metric.Point()) } // This will get set to nil if a successful write occurs err = errors.New("Could not write to any InfluxDB server in cluster") p := rand.Perm(len(i.conns)) for _, n := range p { if e := i.conns[n].Write(bp); e != nil { log.Println("ERROR: " + e.Error()) } else { err = nil break } } // If all of the writes failed, create a new connection array so that // i.Connect() will be called on the next gather. if err != nil { i.conns = make([]client.Client) } return err } func init() { outputs.Add("influxdb", func() telegraf.Output { return &InfluxDB{ Timeout: internal.Duration{Duration: time.Second * 5}, } }) }