Add `go mod` support (#2503)

* Remove vendor and go-dep

Signed-off-by: Yong Tang <yong.tang.github@outlook.com>

* Add go.mod

Signed-off-by: Yong Tang <yong.tang.github@outlook.com>

* Update Makefile and .travis.yml

Signed-off-by: Yong Tang <yong.tang.github@outlook.com>

1 files changed, 0 insertions, 100 deletions

diff --git a/vendor/github.com/rcrowley/go-metrics/writer.go b/vendor/github.com/rcrowley/go-metrics/writer.go
deleted file mode 100644
index 091e971d2..000000000
--- a/vendor/github.com/rcrowley/go-metrics/writer.go
+++ /dev/null
@@ -1,100 +0,0 @@
-package metrics
-
-import (
-	"fmt"
-	"io"
-	"sort"
-	"time"
-)
-
-// Write sorts writes each metric in the given registry periodically to the
-// given io.Writer.
-func Write(r Registry, d time.Duration, w io.Writer) {
-	for _ = range time.Tick(d) {
-		WriteOnce(r, w)
-	}
-}
-
-// WriteOnce sorts and writes metrics in the given registry to the given
-// io.Writer.
-func WriteOnce(r Registry, w io.Writer) {
-	var namedMetrics namedMetricSlice
-	r.Each(func(name string, i interface{}) {
-		namedMetrics = append(namedMetrics, namedMetric{name, i})
-	})
-
-	sort.Sort(namedMetrics)
-	for _, namedMetric := range namedMetrics {
-		switch metric := namedMetric.m.(type) {
-		case Counter:
-			fmt.Fprintf(w, "counter %s\n", namedMetric.name)
-			fmt.Fprintf(w, "  count:       %9d\n", metric.Count())
-		case Gauge:
-			fmt.Fprintf(w, "gauge %s\n", namedMetric.name)
-			fmt.Fprintf(w, "  value:       %9d\n", metric.Value())
-		case GaugeFloat64:
-			fmt.Fprintf(w, "gauge %s\n", namedMetric.name)
-			fmt.Fprintf(w, "  value:       %f\n", metric.Value())
-		case Healthcheck:
-			metric.Check()
-			fmt.Fprintf(w, "healthcheck %s\n", namedMetric.name)
-			fmt.Fprintf(w, "  error:       %v\n", metric.Error())
-		case Histogram:
-			h := metric.Snapshot()
-			ps := h.Percentiles([]float64{0.5, 0.75, 0.95, 0.99, 0.999})
-			fmt.Fprintf(w, "histogram %s\n", namedMetric.name)
-			fmt.Fprintf(w, "  count:       %9d\n", h.Count())
-			fmt.Fprintf(w, "  min:         %9d\n", h.Min())
-			fmt.Fprintf(w, "  max:         %9d\n", h.Max())
-			fmt.Fprintf(w, "  mean:        %12.2f\n", h.Mean())
-			fmt.Fprintf(w, "  stddev:      %12.2f\n", h.StdDev())
-			fmt.Fprintf(w, "  median:      %12.2f\n", ps[0])
-			fmt.Fprintf(w, "  75%%:         %12.2f\n", ps[1])
-			fmt.Fprintf(w, "  95%%:         %12.2f\n", ps[2])
-			fmt.Fprintf(w, "  99%%:         %12.2f\n", ps[3])
-			fmt.Fprintf(w, "  99.9%%:       %12.2f\n", ps[4])
-		case Meter:
-			m := metric.Snapshot()
-			fmt.Fprintf(w, "meter %s\n", namedMetric.name)
-			fmt.Fprintf(w, "  count:       %9d\n", m.Count())
-			fmt.Fprintf(w, "  1-min rate:  %12.2f\n", m.Rate1())
-			fmt.Fprintf(w, "  5-min rate:  %12.2f\n", m.Rate5())
-			fmt.Fprintf(w, "  15-min rate: %12.2f\n", m.Rate15())
-			fmt.Fprintf(w, "  mean rate:   %12.2f\n", m.RateMean())
-		case Timer:
-			t := metric.Snapshot()
-			ps := t.Percentiles([]float64{0.5, 0.75, 0.95, 0.99, 0.999})
-			fmt.Fprintf(w, "timer %s\n", namedMetric.name)
-			fmt.Fprintf(w, "  count:       %9d\n", t.Count())
-			fmt.Fprintf(w, "  min:         %9d\n", t.Min())
-			fmt.Fprintf(w, "  max:         %9d\n", t.Max())
-			fmt.Fprintf(w, "  mean:        %12.2f\n", t.Mean())
-			fmt.Fprintf(w, "  stddev:      %12.2f\n", t.StdDev())
-			fmt.Fprintf(w, "  median:      %12.2f\n", ps[0])
-			fmt.Fprintf(w, "  75%%:         %12.2f\n", ps[1])
-			fmt.Fprintf(w, "  95%%:         %12.2f\n", ps[2])
-			fmt.Fprintf(w, "  99%%:         %12.2f\n", ps[3])
-			fmt.Fprintf(w, "  99.9%%:       %12.2f\n", ps[4])
-			fmt.Fprintf(w, "  1-min rate:  %12.2f\n", t.Rate1())
-			fmt.Fprintf(w, "  5-min rate:  %12.2f\n", t.Rate5())
-			fmt.Fprintf(w, "  15-min rate: %12.2f\n", t.Rate15())
-			fmt.Fprintf(w, "  mean rate:   %12.2f\n", t.RateMean())
-		}
-	}
-}
-
-type namedMetric struct {
-	name string
-	m    interface{}
-}
-
-// namedMetricSlice is a slice of namedMetrics that implements sort.Interface.
-type namedMetricSlice []namedMetric
-
-func (nms namedMetricSlice) Len() int { return len(nms) }
-
-func (nms namedMetricSlice) Swap(i, j int) { nms[i], nms[j] = nms[j], nms[i] }
-
-func (nms namedMetricSlice) Less(i, j int) bool {
-	return nms[i].name < nms[j].name
-}