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opentsdb.go
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opentsdb.go
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package opentsdb
import (
"bufio"
"bytes"
"compress/gzip"
"encoding/json"
"io"
"log"
"net"
"net/http"
"net/textproto"
"strconv"
"strings"
"sync"
"time"
"github.com/influxdb/influxdb/tsdb"
)
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 []tsdb.Point) (uint64, error)
}
// Server is an InfluxDB input class to implement OpenTSDB's input protocols.
type Server struct {
writer SeriesWriter
database string
listener *net.TCPListener
tsdbhttp *tsdbHTTPListener
wg sync.WaitGroup
addr net.Addr
mu sync.Mutex
}
func NewServer(w SeriesWriter, retpol string, db string) *Server {
s := &Server{}
s.writer = w
s.database = db
s.tsdbhttp = makeTSDBHTTPListener()
return s
}
func (s *Server) Addr() net.Addr {
s.mu.Lock()
defer s.mu.Unlock()
return s.addr
}
// ListenAndServe start the OpenTSDB compatible server on the given
// ip and port.
func (s *Server) ListenAndServe(listenAddress string) {
var err error
addr, err := net.ResolveTCPAddr("tcp", 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
}
s.mu.Lock()
s.addr = s.listener.Addr()
s.mu.Unlock()
s.wg.Add(1)
// Set up the background HTTP server that we
// will pass http request to via a channel
mux := http.NewServeMux()
mux.HandleFunc("/api/metadata/put", func(w http.ResponseWriter, r *http.Request) {
w.WriteHeader(http.StatusNoContent)
})
mux.Handle("/api/put", s)
httpsrv := &http.Server{}
httpsrv.Handler = mux
go httpsrv.Serve(s.tsdbhttp)
go func() {
defer s.wg.Done()
for {
conn, err := s.listener.Accept()
if opErr, ok := err.(*net.OpError); ok && !opErr.Temporary() {
log.Println("openTSDB TCP listener closed")
return
}
if err != nil {
log.Println("error accepting openTSDB: ", err.Error())
continue
}
s.wg.Add(1)
go s.HandleConnection(conn)
}
}()
}
func (s *Server) Close() error {
var err error
if s.listener != nil {
err = (*s.listener).Close()
}
s.wg.Wait()
s.listener = nil
return err
}
// HandleConnection takes each new connection and attempts to
// determine if it should be handled by the HTTP handler, if
// parsing as a HTTP request fails, we'll pass it to the
// telnet handler
func (s *Server) HandleConnection(conn net.Conn) {
var peekbuf bytes.Buffer
t := io.TeeReader(conn, &peekbuf)
r := bufio.NewReader(t)
_, httperr := http.ReadRequest(r)
splice := io.MultiReader(&peekbuf, conn)
bufsplice := bufio.NewReader(splice)
newc := &tsdbConn{
Conn: conn,
rdr: bufsplice,
}
if httperr == nil {
s.tsdbhttp.acc <- tsdbHTTPReq{
conn: newc,
}
} else {
s.HandleTelnet(newc)
}
}
// HandleTelnet accepts 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
func (s *Server) HandleTelnet(conn net.Conn) {
reader := bufio.NewReader(conn)
tp := textproto.NewReader(reader)
defer conn.Close()
defer s.wg.Done()
for {
line, err := tp.ReadLine()
if err != nil {
log.Println("error reading from openTSDB connection", err.Error())
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
}
measurement := 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 time, 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: time 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["value"], err = strconv.ParseFloat(valueStr, 64)
if err != nil {
log.Println("TSDBServer: could not parse value as float: ", valueStr)
continue
}
p := tsdb.NewPoint(measurement, tags, fields, t)
_, err = s.writer.WriteSeries(s.database, "", []tsdb.Point{p})
if err != nil {
log.Println("TSDB cannot write data: ", err)
continue
}
}
}
/*
tsdbDP is a struct to unmarshal OpenTSDB /api/put data into
Request is either tsdbDP, or a []tsdbDP
{
"metric": "sys.cpu.nice",
"timestamp": 1346846400,
"value": 18,
"tags": {
"host": "web01",
"dc": "lga"
}
}
*/
type tsdbDP struct {
Metric string `json:"metric"`
Time int64 `json:"timestamp"`
Value float64 `json:"value"`
Tags map[string]string `json:"tags,omitempty"`
}
// ServeHTTP implements OpenTSDB's HTTP /api/put endpoint
func (s *Server) ServeHTTP(w http.ResponseWriter, r *http.Request) {
defer r.Body.Close()
defer s.wg.Done()
if r.Method != "POST" {
http.Error(w, http.StatusText(http.StatusMethodNotAllowed), http.StatusMethodNotAllowed)
return
}
dps := make([]tsdbDP, 1)
var br *bufio.Reader
// We need to peek and see if this is an array or a single
// DP
multi := false
if r.Header.Get("Content-Encoding") == "gzip" {
zr, err := gzip.NewReader(r.Body)
if err != nil {
http.Error(w, "Could not read gzip, "+err.Error(), http.StatusBadRequest)
return
}
br = bufio.NewReader(zr)
} else {
br = bufio.NewReader(r.Body)
}
f, err := br.Peek(1)
if err != nil || len(f) != 1 {
http.Error(w, "Could not peek at JSON data, "+err.Error(), http.StatusBadRequest)
return
}
switch f[0] {
case '{':
case '[':
multi = true
default:
http.Error(w, "Expected JSON array or hash", http.StatusBadRequest)
return
}
dec := json.NewDecoder(br)
if multi {
err = dec.Decode(&dps)
} else {
err = dec.Decode(&dps[0])
}
if err != nil {
http.Error(w, "Could not decode JSON as TSDB data", http.StatusBadRequest)
return
}
var idps []tsdb.Point
for dpi := range dps {
dp := dps[dpi]
var ts time.Time
if dp.Time < 10000000000 {
ts = time.Unix(dp.Time, 0)
} else {
ts = time.Unix(dp.Time/1000, (dp.Time%1000)*1000)
}
fields := make(map[string]interface{})
fields["value"] = dp.Value
if err != nil {
continue
}
p := tsdb.NewPoint(dp.Metric, dp.Tags, fields, ts)
idps = append(idps, p)
}
_, err = s.writer.WriteSeries(s.database, "", idps)
if err != nil {
log.Println("TSDB cannot write data: ", err)
}
w.WriteHeader(http.StatusNoContent)
}
// tsdbHTTPListener is a listener that takes connects from a channel
// rather than directly from a network socket
type tsdbHTTPListener struct {
addr net.Addr
cls chan struct{}
acc chan tsdbHTTPReq
}
// tsdbHTTPReq represents a incoming connection that we have established
// to be a valid http request.
type tsdbHTTPReq struct {
conn net.Conn
err error
}
func (l *tsdbHTTPListener) Accept() (c net.Conn, err error) {
select {
case newc := <-l.acc:
log.Println("TSDB listener accept ", newc)
return newc.conn, newc.err
case <-l.cls:
close(l.cls)
close(l.acc)
return nil, nil
}
}
func (l *tsdbHTTPListener) Close() error {
l.cls <- struct{}{}
return nil
}
func (l *tsdbHTTPListener) Addr() net.Addr {
return l.addr
}
func makeTSDBHTTPListener() *tsdbHTTPListener {
return &tsdbHTTPListener{
acc: make(chan tsdbHTTPReq),
cls: make(chan struct{}),
}
}
// tsdbConn is a net.Conn implmentation used to splice peeked buffer content
// to the pre-existing net.Conn that was peeked into
type tsdbConn struct {
rdr *bufio.Reader
net.Conn
}
// Read implmeents the io.Reader interface
func (c *tsdbConn) Read(b []byte) (n int, err error) {
return c.rdr.Read(b)
}