support falcon datamodel

Makefile

@@ -2,7 +2,7 @@
 
 NOW = $(shell date -u '+%Y%m%d%I%M%S')
 
-RELEASE_VERSION = 5.2.2
+RELEASE_VERSION = 5.3.0
 
 APP 			= n9e
 SERVER_BIN  	= $(APP)

src/server/router/router.go

@@ -74,6 +74,7 @@ func configRoute(r *gin.Engine, version string) {
 	}
 
 	r.POST("/opentsdb/put", handleOpenTSDB)
+	r.POST("/openfalcon/push", falconPush)
 	r.POST("/prometheus/v1/write", remoteWrite)
 	r.POST("/prometheus/v1/query", queryPromql)
 

src/server/router/router_openfalcon.go

@@ -0,0 +1,228 @@
+package router
+
+import (
+	"compress/gzip"
+	"encoding/json"
+	"fmt"
+	"io/ioutil"
+	"strconv"
+	"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 FalconMetric struct {
+	Metric       string      `json:"metric"`
+	Endpoint     string      `json:"endpoint"`
+	Timestamp    int64       `json:"timestamp"`
+	ValueUnTyped interface{} `json:"value"`
+	Value        float64     `json:"-"`
+	Tags         string      `json:"tags"`
+}
+
+func (m *FalconMetric) Clean() error {
+	if m.Metric == "" {
+		return fmt.Errorf("metric is blank")
+	}
+
+	switch v := m.ValueUnTyped.(type) {
+	case string:
+		if f, err := strconv.ParseFloat(v, 64); err == nil {
+			m.Value = f
+		} else {
+			return fmt.Errorf("unparseable value %v", v)
+		}
+	case float64:
+		m.Value = v
+	case uint64:
+		m.Value = float64(v)
+	case int64:
+		m.Value = float64(v)
+	case int:
+		m.Value = float64(v)
+	default:
+		return fmt.Errorf("unparseable value %v", v)
+	}
+
+	// if timestamp bigger than 32 bits, likely in milliseconds
+	if m.Timestamp > 0xffffffff {
+		m.Timestamp /= 1000
+	}
+
+	return nil
+}
+
+func (m *FalconMetric) ToProm() (*prompb.TimeSeries, string, error) {
+	pt := &prompb.TimeSeries{}
+	pt.Samples = append(pt.Samples, prompb.Sample{
+		// use ms
+		Timestamp: m.Timestamp * 1000,
+		Value:     m.Value,
+	})
+
+	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,
+	})
+
+	tagarr := strings.Split(m.Tags, ",")
+	tagmap := make(map[string]string, len(tagarr)+1)
+
+	for i := 0; i < len(tagarr); i++ {
+		tmp := strings.SplitN(tagarr[i], "=", 2)
+		if len(tmp) != 2 {
+			continue
+		}
+
+		tagmap[tmp[0]] = tmp[1]
+	}
+
+	ident := ""
+
+	if len(m.Endpoint) > 0 {
+		ident = m.Endpoint
+		if id, exists := tagmap["ident"]; exists {
+			ident = id
+			// 以tags中的ident作为唯一标识
+			tagmap["endpoint"] = m.Endpoint
+		} else {
+			// 把endpoint塞到tags中，改key为ident
+			tagmap["ident"] = m.Endpoint
+		}
+	}
+
+	for key, value := range tagmap {
+		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: value,
+		})
+	}
+
+	return pt, ident, nil
+}
+
+func falconPush(c *gin.Context) {
+	var bs []byte
+	var err error
+
+	if c.GetHeader("Content-Encoding") == "gzip" {
+		r, err := gzip.NewReader(c.Request.Body)
+		if err != nil {
+			c.String(400, err.Error())
+			return
+		}
+		defer r.Close()
+		bs, err = ioutil.ReadAll(r)
+	} else {
+		defer c.Request.Body.Close()
+		bs, err = ioutil.ReadAll(c.Request.Body)
+	}
+
+	if err != nil {
+		c.String(400, err.Error())
+		return
+	}
+
+	var arr []FalconMetric
+
+	if bs[0] == '[' {
+		err = json.Unmarshal(bs, &arr)
+	} else {
+		var one FalconMetric
+		err = json.Unmarshal(bs, &one)
+		arr = []FalconMetric{one}
+	}
+
+	if err != nil {
+		c.String(400, err.Error())
+		return
+	}
+
+	var (
+		succ int
+		fail int
+		msg  = "data pushed to queue"
+		list = make([]interface{}, 0, len(arr))
+		ts   = time.Now().Unix()
+		ids  = make(map[string]interface{})
+	)
+
+	for i := 0; i < len(arr); i++ {
+		if err := arr[i].Clean(); err != nil {
+			fail++
+			continue
+		}
+
+		pt, ident, err := arr[i].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, "openfalcon").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,
+	})
+}