/
output.go
200 lines (175 loc) · 4.17 KB
/
output.go
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package heka_opentsdb_output
import (
"bytes"
"compress/gzip"
"errors"
"fmt"
"github.com/mozilla-services/heka/pipeline"
"gopkg.in/mgo.v2"
"io/ioutil"
"log"
"net/http"
"net/url"
"runtime"
"runtime/debug"
"strings"
"time"
)
type timeoutTransport struct {
*http.Transport
Timeout time.Time
}
func (t *timeoutTransport) RoundTrip(r *http.Request) (*http.Response, error) {
if time.Now().After(t.Timeout) {
t.Transport.CloseIdleConnections()
t.Timeout = time.Now().Add(time.Minute * 5)
}
return t.Transport.RoundTrip(r)
}
type OpenTsdbOutput struct {
*OpenTsdbOutputConfig
mgoSession *mgo.Session
logMsgChan chan []byte
client *http.Client
}
type OpenTsdbOutputConfig struct {
LogMsgChSize int
TsdbWritingSize int
//the writer count
TsdbWriterCount int
//the time period of writing data to opentsdb
TsdbWriteTimeout int
//the url of opentsdb server
Url string
}
func (o *OpenTsdbOutput) ConfigStruct() interface{} {
return &OpenTsdbOutputConfig{
Url: "127.0.0.1:4242",
LogMsgChSize: 10000,
TsdbWritingSize: 20,
TsdbWriteTimeout: 10,
TsdbWriterCount: runtime.NumCPU(),
}
}
func (o *OpenTsdbOutput) Init(config interface{}) (err error) {
o.OpenTsdbOutputConfig = config.(*OpenTsdbOutputConfig)
//todo: check address validity
// if o.url, err = url.Parse(o.Address); err != nil {
// return fmt.Errorf("Can't parse URL '%s': %s", o.Address, err.Error())
// }
//
o.client = &http.Client{
Transport: &timeoutTransport{Transport: new(http.Transport)},
Timeout: time.Minute,
}
var u *url.URL
if u, err = url.Parse(o.Url); err == nil {
}
o.logMsgChan = make(chan []byte, o.LogMsgChSize)
u, err = u.Parse("/api/put")
if err != nil {
return err
}
if strings.HasPrefix(u.Host, ":") {
u.Host = "localhost" + u.Host
}
o.Url = u.String()
if err != nil {
log.Printf("initialize OpenTsdbOutput failed, %s", err.Error())
return err
}
return
}
func (o *OpenTsdbOutput) SendDataPoints(dps [][]byte, tsdb string) (*http.Response, error) {
var buf bytes.Buffer
g := gzip.NewWriter(&buf)
//handle bytes
g.Write([]byte("["))
g.Write(bytes.Join(dps, []byte(",")))
g.Write([]byte("]"))
if err := g.Close(); err != nil {
fmt.Println("gzip error")
return nil, err
}
req, err := http.NewRequest("POST", tsdb, &buf)
if err != nil {
return nil, err
}
req.Header.Set("Content-Type", "application/json")
req.Header.Set("Content-Encoding", "gzip")
resp, err := o.client.Do(req)
return resp, err
}
func WriteDataToOpenTSDB(mo *OpenTsdbOutput) {
defer func() {
if err, ok := recover().(error); ok {
log.Println("WARN: panic in %v", err)
log.Println(string(debug.Stack()))
}
}()
//srvlog.Printf("WriteDataToOpenTSDB key:%s", key)
cache := make([][]byte, mo.TsdbWritingSize)
lastWrite := time.Now()
i := 0
for logMsg := range mo.logMsgChan {
if i < mo.TsdbWritingSize {
cache[i] = logMsg
i++
}
if i >= mo.TsdbWritingSize || time.Now().Sub(lastWrite) > time.Second*time.Duration(mo.TsdbWriteTimeout) {
resp, err := mo.SendDataPoints(cache[:i], mo.Url)
if err != nil || resp.StatusCode != http.StatusNoContent {
if err == nil {
bts, _ := ioutil.ReadAll(resp.Body)
log.Println(string(bts))
} else {
log.Println("error", err)
}
//restore
for _, v := range cache {
mo.logMsgChan <- v
time.Sleep(time.Second * 5)
}
}
lastWrite = time.Now()
i = 0
}
}
}
func (o *OpenTsdbOutput) Run(or pipeline.OutputRunner, h pipeline.PluginHelper) (err error) {
if or.Encoder() == nil {
return errors.New("Encoder must be specified.")
}
var (
e error
outBytes []byte
)
inChan := or.InChan()
for i := 0; i < o.TsdbWriterCount; i++ {
go WriteDataToOpenTSDB(o)
}
for pack := range inChan {
outBytes, e = or.Encode(pack)
pack.Recycle(e)
if e != nil {
or.LogError(e)
continue
}
if outBytes == nil {
continue
}
if e != nil {
log.Printf("OpenTsdbOutput-%s", e.Error())
continue
}
//fmt.Printf("OpenTsdbOutput-165-%v", logMsg)
o.logMsgChan <- outBytes
//fmt.Println("OpenTsdbOutput:", string(outBytes))
}
return
}
func init() {
pipeline.RegisterPlugin("OpenTsdbOutput", func() interface{} {
return new(OpenTsdbOutput)
})
}