package influxdb import ( "errors" "fmt" "log" "math/rand" "net/url" "strings" "time" "github.com/influxdb/influxdb/client/v2" "github.com/influxdb/telegraf/internal" "github.com/influxdb/telegraf/plugins/outputs" ) 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 Timeout internal.Duration UDPPayload int `toml:"udp_payload"` conns []client.Client } var sampleConfig = ` # The full HTTP or UDP endpoint URL for your InfluxDB instance. # Multiple urls can be specified but it is assumed that they are 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 # Precision of writes, valid values are n, u, ms, s, m, and h # note: using second precision greatly helps InfluxDB compression precision = "s" # Connection timeout (for the connection with InfluxDB), formatted as a string. # If not provided, will default to 0 (no timeout) # 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 ` 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) } 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, }) 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()) } 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(points []*client.Point) error { bp, _ := client.NewBatchPoints(client.BatchPointsConfig{ Database: i.Database, Precision: i.Precision, }) for _, point := range points { bp.AddPoint(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 } } return err } func init() { outputs.Add("influxdb", func() outputs.Output { return &InfluxDB{} }) }