add vendoring with go dep

vendor/github.com/influxdata/influxdb/stress/v2/statement/timestamp.go

@@ -0,0 +1,51 @@
+package statement
+
+import (
+	"log"
+	"time"
+)
+
+// A Timestamp contains all informaiton needed to generate timestamps for points created by InsertStatements
+type Timestamp struct {
+	Count    int
+	Duration time.Duration
+	Jitter   bool
+}
+
+// Time returns the next timestamp needed by the InsertStatement
+func (t *Timestamp) Time(startDate string, series int, precision string) func() int64 {
+	var start time.Time
+	var err error
+
+	if startDate == "now" {
+		start = time.Now()
+	} else {
+		start, err = time.Parse("2006-01-02", startDate)
+	}
+
+	if err != nil {
+		log.Fatalf("Error parsing start time from StartDate\n  string: %v\n  error: %v\n", startDate, err)
+	}
+
+	return nextTime(start, t.Duration, series, precision)
+}
+
+func nextTime(ti time.Time, step time.Duration, series int, precision string) func() int64 {
+	t := ti
+	count := 0
+	return func() int64 {
+		count++
+		if count > series {
+			t = t.Add(step)
+			count = 1
+		}
+
+		var timestamp int64
+		if precision == "s" {
+			timestamp = t.Unix()
+		} else {
+			timestamp = t.UnixNano()
+		}
+		return timestamp
+	}
+}