telegraf/outputs/influxdb/influxdb.go

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package influxdb
import (
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"errors"
"fmt"
"log"
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"math/rand"
"net/url"
"strings"
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"time"
"github.com/influxdb/influxdb/client/v2"
"github.com/influxdb/telegraf/internal"
"github.com/influxdb/telegraf/outputs"
)
type InfluxDB struct {
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// 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 {
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urls = append(urls, u)
}
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// 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)
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}
var conns []client.Client
for _, u := range urls {
switch {
case strings.HasPrefix(u, "udp"):
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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{
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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)
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}
}
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i.conns = conns
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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"
}
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// 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)
}
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// 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 {
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log.Println("ERROR: " + e.Error())
} else {
err = nil
break
}
}
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return err
}
func init() {
outputs.Add("influxdb", func() outputs.Output {
return &InfluxDB{}
})
}