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opentsdb.go
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opentsdb.go
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package opentsdb
import (
"fmt"
"log"
"net"
"net/url"
"regexp"
"sort"
"strconv"
"strings"
"github.com/influxdata/telegraf"
"github.com/influxdata/telegraf/plugins/outputs"
)
var (
allowedChars = regexp.MustCompile(`[^a-zA-Z0-9-_./\p{L}]`)
hypenChars = strings.NewReplacer(
"@", "-",
"*", "-",
`%`, "-",
"#", "-",
"$", "-")
defaultHttpPath = "/api/put"
defaultSeperator = "_"
)
type OpenTSDB struct {
Prefix string
Host string
Port int
HttpBatchSize int // deprecated httpBatchSize form in 1.8
HttpPath string
Debug bool
Separator string
}
var sampleConfig = `
## prefix for metrics keys
prefix = "my.specific.prefix."
## DNS name of the OpenTSDB server
## Using "opentsdb.example.com" or "tcp://opentsdb.example.com" will use the
## telnet API. "http://opentsdb.example.com" will use the Http API.
host = "opentsdb.example.com"
## Port of the OpenTSDB server
port = 4242
## Number of data points to send to OpenTSDB in Http requests.
## Not used with telnet API.
http_batch_size = 50
## URI Path for Http requests to OpenTSDB.
## Used in cases where OpenTSDB is located behind a reverse proxy.
http_path = "/api/put"
## Debug true - Prints OpenTSDB communication
debug = false
## Separator separates measurement name from field
separator = "_"
`
func ToLineFormat(tags map[string]string) string {
tagsArray := make([]string, len(tags))
index := 0
for k, v := range tags {
tagsArray[index] = fmt.Sprintf("%s=%s", k, v)
index++
}
sort.Strings(tagsArray)
return strings.Join(tagsArray, " ")
}
func (o *OpenTSDB) Connect() error {
if !strings.HasPrefix(o.Host, "http") && !strings.HasPrefix(o.Host, "tcp") {
o.Host = "tcp://" + o.Host
}
// Test Connection to OpenTSDB Server
u, err := url.Parse(o.Host)
if err != nil {
return fmt.Errorf("Error in parsing host url: %s", err.Error())
}
uri := fmt.Sprintf("%s:%d", u.Host, o.Port)
tcpAddr, err := net.ResolveTCPAddr("tcp", uri)
if err != nil {
return fmt.Errorf("OpenTSDB TCP address cannot be resolved: %s", err)
}
connection, err := net.DialTCP("tcp", nil, tcpAddr)
if err != nil {
return fmt.Errorf("OpenTSDB Telnet connect fail: %s", err)
}
defer connection.Close()
return nil
}
func (o *OpenTSDB) Write(metrics []telegraf.Metric) error {
if len(metrics) == 0 {
return nil
}
u, err := url.Parse(o.Host)
if err != nil {
return fmt.Errorf("Error in parsing host url: %s", err.Error())
}
if u.Scheme == "" || u.Scheme == "tcp" {
return o.WriteTelnet(metrics, u)
} else if u.Scheme == "http" || u.Scheme == "https" {
return o.WriteHttp(metrics, u)
} else {
return fmt.Errorf("Unknown scheme in host parameter.")
}
}
func (o *OpenTSDB) WriteHttp(metrics []telegraf.Metric, u *url.URL) error {
http := openTSDBHttp{
Host: u.Host,
Port: o.Port,
Scheme: u.Scheme,
User: u.User,
BatchSize: o.HttpBatchSize,
Path: o.HttpPath,
Debug: o.Debug,
}
for _, m := range metrics {
now := m.Time().UnixNano() / 1000000000
tags := cleanTags(m.Tags())
for fieldName, value := range m.Fields() {
switch value.(type) {
case int64:
case uint64:
case float64:
default:
log.Printf("D! OpenTSDB does not support metric value: [%s] of type [%T].\n", value, value)
continue
}
metric := &HttpMetric{
Metric: sanitize(fmt.Sprintf("%s%s%s%s",
o.Prefix, m.Name(), o.Separator, fieldName)),
Tags: tags,
Timestamp: now,
Value: value,
}
if err := http.sendDataPoint(metric); err != nil {
return err
}
}
}
if err := http.flush(); err != nil {
return err
}
return nil
}
func (o *OpenTSDB) WriteTelnet(metrics []telegraf.Metric, u *url.URL) error {
// Send Data with telnet / socket communication
uri := fmt.Sprintf("%s:%d", u.Host, o.Port)
tcpAddr, _ := net.ResolveTCPAddr("tcp", uri)
connection, err := net.DialTCP("tcp", nil, tcpAddr)
if err != nil {
return fmt.Errorf("OpenTSDB: Telnet connect fail")
}
defer connection.Close()
for _, m := range metrics {
now := m.Time().UnixNano() / 1000000000
tags := ToLineFormat(cleanTags(m.Tags()))
for fieldName, value := range m.Fields() {
switch value.(type) {
case int64:
case uint64:
case float64:
default:
log.Printf("D! OpenTSDB does not support metric value: [%s] of type [%T].\n", value, value)
continue
}
metricValue, buildError := buildValue(value)
if buildError != nil {
log.Printf("E! OpenTSDB: %s\n", buildError.Error())
continue
}
messageLine := fmt.Sprintf("put %s %v %s %s\n",
sanitize(fmt.Sprintf("%s%s%s%s", o.Prefix, m.Name(), o.Separator, fieldName)),
now, metricValue, tags)
_, err := connection.Write([]byte(messageLine))
if err != nil {
return fmt.Errorf("OpenTSDB: Telnet writing error %s", err.Error())
}
}
}
return nil
}
func cleanTags(tags map[string]string) map[string]string {
tagSet := make(map[string]string, len(tags))
for k, v := range tags {
val := sanitize(v)
if val != "" {
tagSet[sanitize(k)] = val
}
}
return tagSet
}
func buildValue(v interface{}) (string, error) {
var retv string
switch p := v.(type) {
case int64:
retv = IntToString(int64(p))
case uint64:
retv = UIntToString(uint64(p))
case float64:
retv = FloatToString(float64(p))
default:
return retv, fmt.Errorf("unexpected type %T with value %v for OpenTSDB", v, v)
}
return retv, nil
}
func IntToString(input_num int64) string {
return strconv.FormatInt(input_num, 10)
}
func UIntToString(input_num uint64) string {
return strconv.FormatUint(input_num, 10)
}
func FloatToString(input_num float64) string {
return strconv.FormatFloat(input_num, 'f', 6, 64)
}
func (o *OpenTSDB) SampleConfig() string {
return sampleConfig
}
func (o *OpenTSDB) Description() string {
return "Configuration for OpenTSDB server to send metrics to"
}
func (o *OpenTSDB) Close() error {
return nil
}
func sanitize(value string) string {
// Apply special hypenation rules to preserve backwards compatibility
value = hypenChars.Replace(value)
// Replace any remaining illegal chars
return allowedChars.ReplaceAllLiteralString(value, "_")
}
func init() {
outputs.Add("opentsdb", func() telegraf.Output {
return &OpenTSDB{
HttpPath: defaultHttpPath,
Separator: defaultSeperator,
}
})
}