143 lines
3.2 KiB
Go
143 lines
3.2 KiB
Go
package influxdb
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import (
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"errors"
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"fmt"
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"log"
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"math/rand"
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"net/url"
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"strings"
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"github.com/influxdb/influxdb/client"
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t "github.com/influxdb/telegraf"
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"github.com/influxdb/telegraf/outputs"
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)
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type InfluxDB struct {
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// URL is only for backwards compatability
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URL string
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URLs []string `toml:"urls"`
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Username string
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Password string
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Database string
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UserAgent string
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Timeout t.Duration
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conns []*client.Client
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}
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var sampleConfig = `
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# The full HTTP endpoint URL for your InfluxDB instance
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# Multiple urls can be specified for InfluxDB cluster support. Server to
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# write to will be randomly chosen each interval.
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urls = ["http://localhost:8086"] # required.
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# The target database for metrics. This database must already exist
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database = "telegraf" # required.
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# Connection timeout (for the connection with InfluxDB), formatted as a string.
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# Valid time units are "ns", "us" (or "µs"), "ms", "s", "m", "h".
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# If not provided, will default to 0 (no timeout)
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# timeout = "5s"
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# username = "telegraf"
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# password = "metricsmetricsmetricsmetrics"
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# Set the user agent for the POSTs (can be useful for log differentiation)
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# user_agent = "telegraf"
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`
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func (i *InfluxDB) Connect() error {
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var urls []*url.URL
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for _, URL := range i.URLs {
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u, err := url.Parse(URL)
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if err != nil {
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return err
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}
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urls = append(urls, u)
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}
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// Backward-compatability with single Influx URL config files
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// This could eventually be removed in favor of specifying the urls as a list
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if i.URL != "" {
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u, err := url.Parse(i.URL)
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if err != nil {
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return err
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}
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urls = append(urls, u)
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}
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var conns []*client.Client
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for _, parsed_url := range urls {
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c, err := client.NewClient(client.Config{
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URL: *parsed_url,
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Username: i.Username,
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Password: i.Password,
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UserAgent: i.UserAgent,
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Timeout: i.Timeout.Duration,
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})
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if err != nil {
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return err
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}
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conns = append(conns, c)
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}
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// This will get set to nil if a successful connection is made
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err := errors.New("Could not create database on any server")
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for _, conn := range conns {
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_, e := conn.Query(client.Query{
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Command: fmt.Sprintf("CREATE DATABASE %s", i.Database),
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})
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if e != nil && !strings.Contains(e.Error(), "database already exists") {
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log.Println("ERROR: " + e.Error())
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} else {
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err = nil
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break
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}
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}
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i.conns = conns
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return err
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}
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func (i *InfluxDB) Close() error {
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// InfluxDB client does not provide a Close() function
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return nil
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}
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func (i *InfluxDB) SampleConfig() string {
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return sampleConfig
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}
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func (i *InfluxDB) Description() string {
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return "Configuration for influxdb server to send metrics to"
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}
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// Choose a random server in the cluster to write to until a successful write
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// occurs, logging each unsuccessful. If all servers fail, return error.
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func (i *InfluxDB) Write(bp client.BatchPoints) error {
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bp.Database = i.Database
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// This will get set to nil if a successful write occurs
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err := errors.New("Could not write to any InfluxDB server in cluster")
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p := rand.Perm(len(i.conns))
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for _, n := range p {
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if _, e := i.conns[n].Write(bp); e != nil {
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log.Println("ERROR: " + e.Error())
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} else {
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err = nil
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break
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}
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}
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return err
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}
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func init() {
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outputs.Add("influxdb", func() outputs.Output {
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return &InfluxDB{}
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})
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}
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