code improvements after running tests / compile step

outputs/opentsdb/opentsdb.go

@@ -0,0 +1,151 @@
+package opentsdb
+
+import (
+	"fmt"
+	"net"
+	"sort"
+	"strconv"
+	"strings"
+	"time"
+
+	"github.com/influxdb/influxdb/client"
+    "github.com/influxdb/telegraf/outputs"
+)
+
+type OpenTSDB struct {
+	Prefix string
+
+	Host string
+	Port int
+}
+
+var sampleConfig = `
+	# prefix for metrics keys
+	prefix = "my.specific.prefix."
+
+	## Telnet Mode ##
+	# DNS name of the OpenTSDB server in telnet mode
+	host = "opentsdb.example.com"
+
+	# Port of the OpenTSDB server in telnet mode
+	port = 4242
+`
+
+type MetricLine struct {
+	Metric    string
+	Timestamp int64
+	Value     string
+	Tags      string
+}
+
+func (o *OpenTSDB) Connect() error {
+	// Test Connection to OpenTSDB Server
+	uri := fmt.Sprintf("%s:%d", o.Host, o.Port)
+	tcpAddr, err := net.ResolveTCPAddr("tcp", uri)
+	if err != nil {
+		return fmt.Errorf("OpenTSDB: TCP address cannot be resolved")
+	}
+	connection, err := net.DialTCP("tcp", nil, tcpAddr)
+	defer connection.Close()
+	if err != nil {
+		return fmt.Errorf("OpenTSDB: Telnet connect fail")
+	}
+	return nil
+}
+
+func (o *OpenTSDB) Write(bp client.BatchPoints) error {
+	if len(bp.Points) == 0 {
+		return nil
+	}
+	var timeNow = time.Now()
+	// Send Data with telnet / socket communication
+	uri := fmt.Sprintf("%s:%d", o.Host, o.Port)
+	tcpAddr, _ := net.ResolveTCPAddr("tcp", uri)
+	connection, err := net.DialTCP("tcp", nil, tcpAddr)
+	if err != nil {
+		return fmt.Errorf("OpenTSDB: Telnet connect fail")
+	}
+	for _, pt := range bp.Points {
+		metric := &MetricLine{
+			Metric:    fmt.Sprintf("%s%s", o.Prefix, pt.Measurement),
+			Timestamp: timeNow.Unix(),
+		}
+		if metricValue, err := buildValue(bp, pt); err == nil {
+			metric.Value = metricValue
+		}
+
+		tagsSlice := buildTags(bp.Tags, pt.Tags)
+		metric.Tags = fmt.Sprint(strings.Join(tagsSlice, " "))
+
+		messageLine := fmt.Sprintf("put %s %v %s %s\n", metric.Metric, metric.Timestamp, metric.Value, metric.Tags)
+		fmt.Print(messageLine)
+		_, err := connection.Write([]byte(messageLine))
+		if err != nil {
+			fmt.Errorf("OpenTSDB: Telnet writing error %s", err.Error())
+		}
+	}
+	defer connection.Close()
+
+	return nil
+}
+
+func buildTags(bpTags map[string]string, ptTags map[string]string) []string {
+	tags := make([]string, (len(bpTags) + len(ptTags)))
+	index := 0
+	for k, v := range bpTags {
+		tags[index] = fmt.Sprintf("%s=%s", k, v)
+		index += 1
+	}
+	for k, v := range ptTags {
+		tags[index] = fmt.Sprintf("%s=%s", k, v)
+		index += 1
+	}
+	sort.Strings(tags)
+	return tags
+}
+
+func buildValue(bp client.BatchPoints, pt client.Point) (string, error) {
+	var retv string
+	var v = pt.Fields["value"]
+	switch p := v.(type) {
+	case int64:
+		retv = IntToString(int64(p))
+	case uint64:
+		retv = UIntToString(uint64(p))
+	case float64:
+		retv = FloatToString(float64(p))
+	default:
+		return retv, fmt.Errorf("undeterminable type for telegraf")
+	}
+	return retv, nil
+}
+
+func IntToString(input_num int64) string {
+	return strconv.FormatInt(input_num, 10)
+}
+
+func UIntToString(input_num uint64) string {
+	return strconv.FormatUint(input_num, 10)
+}
+
+func FloatToString(input_num float64) string {
+	return strconv.FormatFloat(input_num, 'f', 6, 64)
+}
+
+func (o *OpenTSDB) SampleConfig() string {
+	return sampleConfig
+}
+
+func (o *OpenTSDB) Description() string {
+	return "Configuration for OpenTSDB server to send metrics to"
+}
+
+func (o *OpenTSDB) Close() error {
+	return nil
+}
+
+func init() {
+	outputs.Add("opentsdb", func() outputs.Output {
+		return &OpenTSDB{}
+	})
+}