[GitHub] [trafficcontrol] mhoppa commented on a change in pull request #4114: Rewrite current stats from Perl to Golang

[GitBox <gi...@apache.org>]

mhoppa commented on a change in pull request #4114: Rewrite current stats from Perl to Golang
URL: https://github.com/apache/trafficcontrol/pull/4114#discussion_r349119248
 
 

 ##########
 File path: traffic_ops/traffic_ops_golang/trafficstats/cdn.go
 ##########
 @@ -0,0 +1,157 @@
+package trafficstats
+
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+
+import (
+	"errors"
+	"fmt"
+	"net/http"
+
+	influx "github.com/influxdata/influxdb/client/v2"
+	"github.com/lib/pq"
+
+	"github.com/apache/trafficcontrol/lib/go-tc"
+	"github.com/apache/trafficcontrol/lib/go-util"
+	"github.com/apache/trafficcontrol/traffic_ops/traffic_ops_golang/api"
+)
+
+const (
+	cdnStatsQuery = `
+SELECT last(value) FROM "%s"."monthly"."%s"
+	WHERE cdn = $cdn`
+)
+
+// GetCurrentStats handler for getting current stats for CDNs
+func GetCurrentStats(w http.ResponseWriter, r *http.Request) {
+	inf, userErr, sysErr, errCode := api.NewInfo(r, nil, nil)
+	tx := inf.Tx.Tx
+
+	if userErr != nil || sysErr != nil {
+		api.HandleErr(w, r, tx, errCode, userErr, sysErr)
+		return
+	}
+	defer inf.Close()
+
+	client, err := inf.CreateInfluxClient()
+	if err != nil {
+		api.HandleErr(w, r, tx, http.StatusInternalServerError, nil, err)
+		return
+	} else if client == nil {
+		sysErr = errors.New("Traffic Stats is not configured, but DS stats were requested")
+		api.HandleErr(w, r, tx, http.StatusInternalServerError, nil, sysErr)
+		return
+	}
+	defer (*client).Close()
+
+	currentStats := []interface{}{}
+
+	// Get CDN names
+	cdns := []string{}
+	if err := tx.QueryRow(`SELECT ARRAY(SELECT name FROM cdn)`).Scan(pq.Array(&cdns)); err != nil {
+		api.HandleErr(w, r, tx, http.StatusInternalServerError, nil, errors.New("querying cdn names"))
+		return
+	}
+	totalStats := tc.TrafficStatsTotalStats{
+		CDN: "total",
+	}
+	// util func to add to total
+	addToTotal := func(v, t *float64) *float64 {
+		if v == nil {
+			return t
+		}
+		if t == nil {
+			t = util.FloatPtr(0.0)
+		}
+		*t += *v
+		return t
+	}
+
+	for _, cdn := range cdns {
+		cdnStats := tc.TrafficStatsCDNStats{
+			CDN: cdn,
+		}
+		bw, err := getCDNStat(client, cdn, "bandwidth.cdn.1min", inf.Config.ConfigInflux.CacheDBName)
+		if err != nil {
+			sysErr = fmt.Errorf("getting bandwidth from cdn %v: %v", cdn, err)
+			api.HandleErr(w, r, tx, http.StatusInternalServerError, nil, sysErr)
+			return
+		}
+		totalStats.Bandwidth = addToTotal(bw, totalStats.Bandwidth)
+
+		if bw != nil {
+			cdnStats.Bandwidth = util.FloatPtr(*bw / 1000000)
+		}
+
+		con, err := getCDNStat(client, cdn, "connections.cdn.1min", inf.Config.ConfigInflux.CacheDBName)
+		if err != nil {
+			sysErr = fmt.Errorf("getting connections from cdn %v: %v", cdn, err)
+			api.HandleErr(w, r, tx, http.StatusInternalServerError, nil, sysErr)
+			return
+		}
+		totalStats.Connnections = addToTotal(con, totalStats.Connnections)
+		cdnStats.Connnections = con
+
+		cap, err := getCDNStat(client, cdn, "maxkbps.cdn.1min", inf.Config.ConfigInflux.CacheDBName)
+		if err != nil {
+			sysErr = fmt.Errorf("getting maxkbps from cdn %v: %v", cdn, err)
+			api.HandleErr(w, r, tx, http.StatusInternalServerError, nil, sysErr)
+			return
+		}
+		if cap != nil {
+			cdnStats.Capacity = util.FloatPtr(*cap / 1000000 * .85)
+		}
+
+		currentStats = append(currentStats, cdnStats)
+	}
+
+	if totalStats.Bandwidth != nil {
+		*totalStats.Bandwidth /= 1000000
+	}
+	currentStats = append(currentStats, totalStats)
+
+	api.WriteResp(w, r, currentStats)
+}
+
+func getCDNStat(client *influx.Client, cdnName, metricName, db string) (*float64, error) {
+	qStr := fmt.Sprintf(cdnStatsQuery, db, metricName)
+	q := influx.NewQueryWithParameters(qStr,
+		db,
+		"rfc3339",
+		map[string]interface{}{
+			"cdn": cdnName,
+		})
+	series, err := getSeries(db, q, client)
+	if err != nil {
+		return nil, err
+	}
+	if series == nil {
+		return nil, nil
+	}
+	vals := series.Values[0]
 
 Review comment:
   let me add a check in just in case :) 

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