Put target loop inside target

target.go

@@ -1,6 +1,10 @@
 package event
 
 import (
+	"bytes"
+	"compress/gzip"
+	"encoding/json"
+	"log"
 	"math"
 	"math/rand"
 	"time"
@@ -68,3 +72,59 @@ func (target *Target) writeEvent(ev *Event) {
 	ev2.SampleRate = int64(math.Max(math.Round(1.0/maxProb), 1.0))
 	target.events = append(target.events, &ev2)
 }
+
+func (target *Target) flushLoop(c *Client) {
+	t := time.NewTicker(time.Duration(target.writePeriodSeconds * float64(time.Second)))
+	defer t.Stop()
+
+	for {
+		select {
+		case <-target.stop:
+			target.flush(c)
+			return
+
+		case <-t.C:
+			target.flush(c)
+		}
+	}
+}
+
+func (target *Target) flush(c *Client) {
+	c.mu.Lock()
+	events := target.events
+	target.events = nil
+	c.mu.Unlock()
+
+	if len(events) == 0 {
+		return
+	}
+
+	buf := &bytes.Buffer{}
+	g := gzip.NewWriter(buf)
+	enc := json.NewEncoder(g)
+
+	err := enc.Encode(events)
+	if err != nil {
+		panic(err)
+	}
+
+	err = g.Close()
+	if err != nil {
+		panic(err)
+	}
+
+	resp, err := target.client.R().
+		SetHeader("Content-Type", "application/json").
+		SetHeader("Content-Encoding", "gzip").
+		SetBody(buf).
+		Post("")
+	if err != nil {
+		log.Printf("failed write to event target: %s", err)
+		return
+	}
+
+	if resp.IsError() {
+		log.Printf("failed write to event target: %d %s: %s", resp.StatusCode(), resp.Status(), resp.String())
+		return
+	}
+}