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main.go
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main.go
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package main
import (
"bytes"
"compress/gzip"
"encoding/json"
"flag"
"io"
"log"
"net/http"
"net/http/httptest"
"net/http/httputil"
"net/url"
"os"
"runtime"
"strings"
"bosun.org/cmd/tsdbrelay/denormalize"
"bosun.org/collect"
"bosun.org/metadata"
"bosun.org/opentsdb"
"bosun.org/util"
)
var (
listenAddr = flag.String("l", ":4242", "Listen address.")
bosunServer = flag.String("b", "bosun", "Target Bosun server. Can specify port with host:port.")
secondaryRelays = flag.String("r", "", "Additional relays to send data to. Intended for secondary data center replication. Only response from primary tsdb server wil be relayed to clients.")
tsdbServer = flag.String("t", "", "Target OpenTSDB server. Can specify port with host:port.")
logVerbose = flag.Bool("v", false, "enable verbose logging")
toDenormalize = flag.String("denormalize", "", "List of metrics to denormalize. Comma seperated list of `metric__tagname__tagname` rules. Will be translated to `__tagvalue.tagvalue.metric`")
redisHost = flag.String("redis", "", "redis host for aggregating external counters")
redisDb = flag.Int("db", 0, "redis db to use for counters")
)
var (
tsdbPutURL string
bosunIndexURL string
denormalizationRules map[string]*denormalize.DenormalizationRule
relayPutUrls []string
)
func main() {
runtime.GOMAXPROCS(runtime.NumCPU())
var err error
myHost, err = os.Hostname()
if err != nil || myHost == "" {
myHost = "tsdbrelay"
}
flag.Parse()
if *bosunServer == "" || *tsdbServer == "" {
log.Fatal("must specify both bosun and tsdb server")
}
log.Println("listen on", *listenAddr)
log.Println("relay to bosun at", *bosunServer)
log.Println("relay to tsdb at", *tsdbServer)
if *toDenormalize != "" {
var err error
denormalizationRules, err = denormalize.ParseDenormalizationRules(*toDenormalize)
if err != nil {
log.Fatal(err)
}
}
tsdbURL := &url.URL{
Scheme: "http",
Host: *tsdbServer,
}
u := url.URL{
Scheme: "http",
Host: *tsdbServer,
Path: "/api/put",
}
tsdbPutURL = u.String()
bosunURL := &url.URL{
Scheme: "http",
Host: *bosunServer,
}
u = url.URL{
Scheme: "http",
Host: *bosunServer,
Path: "/api/index",
}
bosunIndexURL = u.String()
if *secondaryRelays != "" {
for _, rUrl := range strings.Split(*secondaryRelays, ",") {
u = url.URL{
Scheme: "http",
Host: rUrl,
Path: "/api/put",
}
relayPutUrls = append(relayPutUrls, u.String())
}
}
tsdbProxy := util.NewSingleHostProxy(tsdbURL)
bosunProxy := util.NewSingleHostProxy(bosunURL)
rp := &relayProxy{
TSDBProxy: tsdbProxy,
BosunProxy: bosunProxy,
}
http.HandleFunc("/api/put", func(w http.ResponseWriter, r *http.Request) {
rp.relayPut(w, r, true)
})
if *redisHost != "" {
http.HandleFunc("/api/count", collect.HandleCounterPut(*redisHost, *redisDb))
}
http.HandleFunc("/api/metadata/put", func(w http.ResponseWriter, r *http.Request) {
rp.relayMetadata(w, r)
})
http.Handle("/", tsdbProxy)
collectUrl := &url.URL{
Scheme: "http",
Host: *listenAddr,
Path: "/api/put",
}
if err = collect.Init(collectUrl, "tsdbrelay"); err != nil {
log.Fatal(err)
}
log.Fatal(http.ListenAndServe(*listenAddr, nil))
}
func init() {
metadata.AddMetricMeta("tsdbrelay.puts.relayed", metadata.Counter, metadata.Count, "Number of successful puts relayed")
metadata.AddMetricMeta("tsdbrelay.metadata.relayed", metadata.Counter, metadata.Count, "Number of successful metadata puts relayed")
}
func verbose(format string, a ...interface{}) {
if *logVerbose {
log.Printf(format, a...)
}
}
type relayProxy struct {
TSDBProxy *httputil.ReverseProxy
BosunProxy *httputil.ReverseProxy
}
type passthru struct {
io.ReadCloser
buf bytes.Buffer
}
func (p *passthru) Read(b []byte) (int, error) {
n, err := p.ReadCloser.Read(b)
p.buf.Write(b[:n])
return n, err
}
type relayWriter struct {
http.ResponseWriter
code int
}
func (rw *relayWriter) WriteHeader(code int) {
rw.code = code
rw.ResponseWriter.WriteHeader(code)
}
var (
relayHeader = "X-Relayed-From"
myHost string
)
func (rp *relayProxy) relayPut(responseWriter http.ResponseWriter, r *http.Request, parse bool) {
isRelayed := r.Header.Get(relayHeader) != ""
reader := &passthru{ReadCloser: r.Body}
r.Body = reader
w := &relayWriter{ResponseWriter: responseWriter}
rp.TSDBProxy.ServeHTTP(w, r)
if w.code/100 != 2 {
verbose("got status %d", w.code)
return
}
verbose("relayed to tsdb")
collect.Add("puts.relayed", opentsdb.TagSet{}, 1)
// Send to bosun in a separate go routine so we can end the source's request.
go func() {
body := bytes.NewBuffer(reader.buf.Bytes())
req, err := http.NewRequest(r.Method, bosunIndexURL, body)
if err != nil {
verbose("%v", err)
return
}
resp, err := http.DefaultClient.Do(req)
if err != nil {
verbose("bosun relay error: %v", err)
return
}
resp.Body.Close()
verbose("bosun relay success")
}()
// Parse and denormalize datapoints
if !isRelayed && parse && denormalizationRules != nil {
go rp.denormalize(bytes.NewReader(reader.buf.Bytes()))
}
if !isRelayed && len(relayPutUrls) > 0 {
go func() {
for _, relayUrl := range relayPutUrls {
body := bytes.NewBuffer(reader.buf.Bytes())
req, err := http.NewRequest(r.Method, relayUrl, body)
if err != nil {
verbose("%v", err)
return
}
req.Header.Set("Content-Type", "application/json")
req.Header.Set("Content-Encoding", "gzip")
req.Header.Add(relayHeader, myHost)
resp, err := http.DefaultClient.Do(req)
if err != nil {
verbose("secondary relay error: %v", err)
return
}
resp.Body.Close()
verbose("secondary relay success")
}
}()
}
}
func (rp *relayProxy) denormalize(body io.Reader) {
gReader, err := gzip.NewReader(body)
if err != nil {
verbose("error making gzip reader: %v", err)
return
}
decoder := json.NewDecoder(gReader)
dps := []*opentsdb.DataPoint{}
err = decoder.Decode(&dps)
if err != nil {
verbose("error decoding data points: %v", err)
return
}
relayDps := []*opentsdb.DataPoint{}
for _, dp := range dps {
if rule, ok := denormalizationRules[dp.Metric]; ok {
if err = rule.Translate(dp); err == nil {
relayDps = append(relayDps, dp)
} else {
verbose(err.Error())
}
}
}
if len(relayDps) == 0 {
return
}
buf := &bytes.Buffer{}
gWriter := gzip.NewWriter(buf)
encoder := json.NewEncoder(gWriter)
err = encoder.Encode(relayDps)
if err != nil {
verbose("error encoding denormalized data points: %v", err)
return
}
if err = gWriter.Close(); err != nil {
verbose("error zipping denormalized data points: %v", err)
return
}
req, err := http.NewRequest("POST", tsdbPutURL, buf)
if err != nil {
verbose("%v", err)
return
}
req.Header.Set("Content-Type", "application/json")
req.Header.Set("Content-Encoding", "gzip")
responseWriter := httptest.NewRecorder()
rp.relayPut(responseWriter, req, false)
verbose("relayed %d denormalized data points. Tsdb response: %d", len(relayDps), responseWriter.Code)
}
func (rp *relayProxy) relayMetadata(responseWriter http.ResponseWriter, r *http.Request) {
reader := &passthru{ReadCloser: r.Body}
r.Body = reader
w := &relayWriter{ResponseWriter: responseWriter}
rp.BosunProxy.ServeHTTP(w, r)
if w.code != 204 {
verbose("got status %d", w.code)
return
}
verbose("relayed metadata to bosun")
collect.Add("metadata.relayed", opentsdb.TagSet{}, 1)
if r.Header.Get(relayHeader) != "" {
return
}
if len(relayPutUrls) != 0 {
go func() {
for _, relayUrl := range relayPutUrls {
relayUrl = strings.Replace(relayUrl, "/put", "/metadata/put", 1)
body := bytes.NewBuffer(reader.buf.Bytes())
req, err := http.NewRequest(r.Method, relayUrl, body)
if err != nil {
verbose("%v", err)
return
}
req.Header.Set("Content-Type", "application/json")
req.Header.Add(relayHeader, myHost)
resp, err := http.DefaultClient.Do(req)
if err != nil {
verbose("secondary relay error: %v", err)
return
}
resp.Body.Close()
verbose("secondary relay success")
}
}()
}
}