First version of http put working

plugins/outputs/opentsdb/opentsdb.go

@@ -7,6 +7,11 @@ import (
 	"strconv"
 	"strings"
 	"time"
+	"encoding/json"
+	//"os"
+	"io"
+	"net/http"
+	"bytes"
 
 	"github.com/influxdata/telegraf"
 	"github.com/influxdata/telegraf/plugins/outputs"
@@ -18,6 +23,8 @@ type OpenTSDB struct {
 	Host string
 	Port int
 
+	UseHttp bool
+
 	Debug bool
 }
 
@@ -29,12 +36,15 @@ var sampleConfig = `
   prefix = "my.specific.prefix."
 
   ## Telnet Mode ##
-  ## DNS name of the OpenTSDB server in telnet mode
+  ## DNS name of the OpenTSDB server
   host = "opentsdb.example.com"
 
   ## Port of the OpenTSDB server in telnet mode
   port = 4242
 
+  ## Use Http PUT API
+  useHttp = false
+
   ## Debug true - Prints OpenTSDB communication
   debug = false
 `
@@ -46,6 +56,13 @@ type MetricLine struct {
 	Tags      string
 }
 
+type HttpMetric struct {
+	Metric    string `json:"metric"`
+	Timestamp int64 `json:"timestamp"`
+	Value     string `json:"value"`
+	Tags      map[string]string `json:"tags"`
+}
+
 func (o *OpenTSDB) Connect() error {
 	// Test Connection to OpenTSDB Server
 	uri := fmt.Sprintf("%s:%d", o.Host, o.Port)
@@ -65,6 +82,71 @@ func (o *OpenTSDB) Write(metrics []telegraf.Metric) error {
 	if len(metrics) == 0 {
 		return nil
 	}
+
+	if o.UseHttp {
+		return o.WriteHttp(metrics)
+	} else {
+		return o.WriteTelnet(metrics)
+	}
+}
+
+func (o *OpenTSDB) WriteHttp(metrics []telegraf.Metric) error {
+
+	b := new(bytes.Buffer)
+
+	enc := json.NewEncoder(b)
+
+
+
+	io.WriteString(b, "[")
+
+	i := 0
+
+	for _, m := range metrics {
+		now := m.UnixNano() / 1000000000
+		for fieldName, value := range m.Fields() {
+			metricValue, buildError := buildValue(value)
+			if buildError != nil {
+				fmt.Printf("OpenTSDB: %s\n", buildError.Error())
+				continue
+			}
+
+			if i > 0 {
+				io.WriteString(b, ",")
+			}
+
+            metric := &HttpMetric{
+                    Metric: sanitizedChars.Replace(fmt.Sprintf("%s%s_%s",
+                            o.Prefix, m.Name(), fieldName)),
+					Tags: m.Tags(),
+					Timestamp: now,
+					Value: metricValue,
+            }
+
+	        if err := enc.Encode(metric); err != nil {
+				return fmt.Errorf("Metric serialization error %s", err.Error())
+	        }
+
+			i++;
+		}
+	}
+
+	io.WriteString(b, "]")
+
+	uri := fmt.Sprintf("http://%s:%d/api/put", o.Host, o.Port)
+	resp, err := http.Post(uri, "applicaton/json", b)
+	if err != nil {
+		return fmt.Errorf("Error when sending metrics: %s", err.Error())
+	}
+
+	if resp.StatusCode == 200 {
+		fmt.Println("Sent metrics !")
+	}
+
+	return nil
+}
+
+func (o *OpenTSDB) WriteTelnet(metrics []telegraf.Metric) error {
 	now := time.Now()
 
 	// Send Data with telnet / socket communication