Rewrite urlgen in Go

Issue: 1818

This is meant to replace the urlgen shell script.

tests/urlgen/urlgen.go

@@ -0,0 +1,49 @@
+package main
+
+import (
+	"flag"
+	"fmt"
+	"time"
+)
+
+var (
+	i, s, c int
+)
+
+func init() {
+	flag.IntVar(&i, "i", 10, "interval")
+	flag.IntVar(&s, "s", 1, "Number of unique series to generate.")
+	flag.IntVar(&c, "c", 10, "Number of clients to simulate.")
+}
+
+func main() {
+	flag.Parse()
+
+	var (
+		pointsInSeries string
+		j              int = 1
+		k              int
+		printComma     string = ","
+		jsonTemplate   string = `{"name": "cpu", "tags": {"host": "server%d"}, "timestamp": "%s","fields": {"value": 100}}%s`
+		urlTemplate    string = `http://localhost:8086/write POST {"database" : "db", "retentionPolicy" : "raw", "points": [%s]}`
+	)
+
+	t := time.Date(2010, time.January, 1, 8, 0, 0, 0, time.UTC)
+	for ; c > 0; c-- {
+		for ; j < s+1; j++ {
+			for ; k < i; k++ {
+				if k == i-1 {
+					printComma = ""
+				}
+				pointsInSeries = pointsInSeries + fmt.Sprintf(jsonTemplate, j, t.Format(time.RFC3339), printComma)
+				t = t.Add(1 * time.Second)
+			}
+			fmt.Printf(urlTemplate, pointsInSeries)
+			fmt.Println()
+			pointsInSeries = ""
+			k = 0
+			printComma = ","
+		}
+		j = 1
+	}
+}