add datadog receiver

src/server/router/router_datadog.go

@@ -3,25 +3,139 @@ package router
 import (
 	"compress/gzip"
 	"encoding/json"
+	"fmt"
 	"io/ioutil"
 	"net/http"
+	"strings"
+	"time"
 
 	"github.com/didi/nightingale/v5/src/server/config"
+	"github.com/didi/nightingale/v5/src/server/idents"
+	"github.com/didi/nightingale/v5/src/server/memsto"
+	promstat "github.com/didi/nightingale/v5/src/server/stat"
+	"github.com/didi/nightingale/v5/src/server/writer"
 	"github.com/gin-gonic/gin"
+	"github.com/prometheus/common/model"
+	"github.com/prometheus/prometheus/prompb"
 )
 
 type TimeSeries struct {
-	Series []*Metric `json:"series"`
+	Series []*DatadogMetric `json:"series"`
 }
 
-type Metric struct {
+type DatadogMetric struct {
 	Metric string         `json:"metric"`
-	Points []Point  `json:"points"`
+	Points []DatadogPoint `json:"points"`
 	Host   string         `json:"host"`
 	Tags   []string       `json:"tags,omitempty"`
 }
 
-type Point [2]float64
+type DatadogPoint [2]float64
+
+func (m *DatadogMetric) Clean() error {
+	if m.Metric == "" {
+		return fmt.Errorf("metric is blank")
+	}
+	return nil
+}
+
+func (m *DatadogMetric) ToProm() (*prompb.TimeSeries, string, error) {
+	pt := &prompb.TimeSeries{}
+	for _, point := range m.Points {
+		pt.Samples = append(pt.Samples, prompb.Sample{
+			// use ms
+			Timestamp: int64(point[0]) * 1000,
+			Value:     point[1],
+		})
+	}
+
+	if strings.IndexByte(m.Metric, '.') != -1 {
+		m.Metric = strings.ReplaceAll(m.Metric, ".", "_")
+	}
+
+	if strings.IndexByte(m.Metric, '-') != -1 {
+		m.Metric = strings.ReplaceAll(m.Metric, "-", "_")
+	}
+
+	if !model.MetricNameRE.MatchString(m.Metric) {
+		return nil, "", fmt.Errorf("invalid metric name: %s", m.Metric)
+	}
+
+	pt.Labels = append(pt.Labels, &prompb.Label{
+		Name:  model.MetricNameLabel,
+		Value: m.Metric,
+	})
+
+	identInTag := ""
+	hostInTag := ""
+
+	for i := 0; i < len(m.Tags); i++ {
+		arr := strings.SplitN(m.Tags[i], ":", 2)
+		if len(arr) != 2 {
+			continue
+		}
+
+		key := arr[0]
+
+		if key == "ident" {
+			// 如果tags中有ident，那就用
+			identInTag = arr[1]
+			pt.Labels = append(pt.Labels, &prompb.Label{
+				Name:  key,
+				Value: arr[1],
+			})
+			continue
+		}
+
+		if key == "host" {
+			hostInTag = arr[1]
+			continue
+		}
+
+		if strings.IndexByte(key, '.') != -1 {
+			key = strings.ReplaceAll(key, ".", "_")
+		}
+
+		if strings.IndexByte(key, '-') != -1 {
+			key = strings.ReplaceAll(key, "-", "_")
+		}
+
+		if !model.LabelNameRE.MatchString(key) {
+			return nil, "", fmt.Errorf("invalid tag name: %s", key)
+		}
+
+		pt.Labels = append(pt.Labels, &prompb.Label{
+			Name:  key,
+			Value: arr[1],
+		})
+	}
+
+	if m.Host != "" {
+		// 以外层为准，外层host字段覆盖标签中的host
+		hostInTag = m.Host
+	}
+
+	if hostInTag != "" {
+		if identInTag != "" {
+			pt.Labels = append(pt.Labels, &prompb.Label{
+				Name:  "host",
+				Value: hostInTag,
+			})
+		} else {
+			pt.Labels = append(pt.Labels, &prompb.Label{
+				Name:  "ident",
+				Value: hostInTag,
+			})
+		}
+	}
+
+	ident := hostInTag
+	if identInTag != "" {
+		ident = identInTag
+	}
+
+	return pt, ident, nil
+}
 
 func datadogSeries(c *gin.Context) {
 	apiKey, has := c.GetQuery("api_key")
@@ -73,6 +187,71 @@ func datadogSeries(c *gin.Context) {
 		return
 	}
 
-	// TODO clean and convert
+	cnt := len(series.Series)
+	if cnt == 0 {
+		c.String(400, "series empty")
+		return
+	}
 
+	var (
+		succ int
+		fail int
+		msg  = "data pushed to queue"
+		list []interface{}
+		ts   = time.Now().Unix()
+		ids  = make(map[string]interface{})
+	)
+
+	for i := 0; i < cnt; i++ {
+		item := series.Series[i]
+
+		if item == nil {
+			continue
+		}
+
+		if err = item.Clean(); err != nil {
+			fail++
+			continue
+		}
+
+		pt, ident, err := item.ToProm()
+		if err != nil {
+			fail++
+			continue
+		}
+
+		if ident != "" {
+			// register host
+			ids[ident] = ts
+
+			// fill tags
+			target, has := memsto.TargetCache.Get(ident)
+			if has {
+				for key, value := range target.TagsMap {
+					pt.Labels = append(pt.Labels, &prompb.Label{
+						Name:  key,
+						Value: value,
+					})
+				}
+			}
+		}
+
+		list = append(list, pt)
+		succ++
+	}
+
+	if len(list) > 0 {
+		promstat.CounterSampleTotal.WithLabelValues(config.C.ClusterName, "datadog").Add(float64(len(list)))
+		if !writer.Writers.PushQueue(list) {
+			msg = "writer queue full"
+		}
+
+		idents.Idents.MSet(ids)
+	}
+
+	c.JSON(200, gin.H{
+		"succ": succ,
+		"fail": fail,
+		"msg":  msg,
+	})
 }