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opentsdb.go
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opentsdb.go
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package opentsdb
import (
"bufio"
"log"
"net"
"net/textproto"
"strconv"
"strings"
"time"
"github.com/influxdb/influxdb"
)
const (
// DefaultPort represents the default OpenTSDB port.
DefaultPort = 4242
// DefaultDatabaseName is the default OpenTSDB database if none is specified
DefaultDatabaseName = "opentsdb"
)
// SeriesWriter defines the interface for the destination of the data.
type SeriesWriter interface {
WriteSeries(database, retentionPolicy string, points []influxdb.Point) (uint64, error)
}
// An InfluxDB input class to accept OpenTSDB's telnet protocol
// Each telnet command consists of a line of the form:
// put sys.cpu.user 1356998400 42.5 host=webserver01 cpu=0
type Server struct {
writer SeriesWriter
database string
retentionpolicy string
listener *net.TCPListener
}
func NewServer(w SeriesWriter, retpol string, db string) *Server {
s := &Server{}
s.writer = w
s.retentionpolicy = retpol
s.database = db
return s
}
func (s *Server) ListenAndServe(listenAddress string) {
var err error
addr, err := net.ResolveTCPAddr("tcp4", listenAddress)
if err != nil {
log.Println("TSDBServer: ResolveTCPAddr: ", err)
return
}
s.listener, err = net.ListenTCP("tcp", addr)
if err != nil {
log.Println("TSDBServer: Listen: ", err)
return
}
defer s.listener.Close()
s.HandleListener(s.listener)
}
func (s *Server) HandleListener(socket *net.TCPListener) {
for {
// Listen for an incoming connection.
conn, err := socket.Accept()
if err != nil {
log.Println("Error accepting: ", err.Error())
}
// Handle connections in a new goroutine.
go s.HandleConnection(conn)
}
}
func (s *Server) HandleConnection(conn net.Conn) {
reader := bufio.NewReader(conn)
tp := textproto.NewReader(reader)
defer conn.Close()
for {
line, err := tp.ReadLine()
if err != nil {
return
}
inputStrs := strings.Fields(line)
if len(inputStrs) == 1 && inputStrs[0] == "version" {
conn.Write([]byte("InfluxDB TSDB proxy"))
continue
}
if len(inputStrs) < 4 || inputStrs[0] != "put" {
log.Println("TSDBServer: malformed line, skipping: ", line)
continue
}
name := inputStrs[1]
tsStr := inputStrs[2]
valueStr := inputStrs[3]
tagStrs := inputStrs[4:]
var t time.Time
ts, err := strconv.ParseInt(tsStr, 10, 64)
if err != nil {
log.Println("TSDBServer: malformed timestamp, skipping: ", tsStr)
}
switch len(tsStr) {
case 10:
t = time.Unix(ts, 0)
break
case 13:
t = time.Unix(ts/1000, (ts%1000)*1000)
break
default:
log.Println("TSDBServer: timestamp must be 10 or 13 chars, skipping: ", tsStr)
continue
}
tags := make(map[string]string)
for t := range tagStrs {
parts := strings.SplitN(tagStrs[t], "=", 2)
if len(parts) != 2 {
log.Println("TSDBServer: malformed tag data", tagStrs[t])
continue
}
k := parts[0]
tags[k] = parts[1]
}
fields := make(map[string]interface{})
fields[name], err = strconv.ParseFloat(valueStr, 64)
if err != nil {
log.Println("TSDBServer: could not parse value as float: ", valueStr)
continue
}
p := influxdb.Point{
Name: name,
Tags: tags,
Timestamp: t,
Fields: fields,
}
_, err = s.writer.WriteSeries(s.database, s.retentionpolicy, []influxdb.Point{p})
if err != nil {
log.Println("TSDB cannot write data: ", err)
continue
}
}
}