Godeps, vendor: convert dependency management to trash (#3198)

This commit converts the dependency management from Godeps to the vendor
folder, also switching the tool from godep to trash. Since the upstream tool
lacks a few features proposed via a few PRs, until those PRs are merged in
(if), use github.com/karalabe/trash.

You can update dependencies via trash --update.

All dependencies have been updated to their latest version.

Parts of the build system are reworked to drop old notions of Godeps and
invocation of the go vet command so that it doesn't run against the vendor
folder, as that will just blow up during vetting.

The conversion drops OpenCL (and hence GPU mining support) from ethash and our
codebase. The short reasoning is that there's noone to maintain and having
opencl libs in our deps messes up builds as go install ./... tries to build
them, failing with unsatisfied link errors for the C OpenCL deps.

golang.org/x/net/context is not vendored in. We expect it to be fetched by the
user (i.e. using go get). To keep ci.go builds reproducible the package is
"vendored" in build/_vendor.

1 files changed, 156 insertions, 0 deletions

diff --git a/vendor/github.com/rcrowley/go-metrics/exp/exp.go b/vendor/github.com/rcrowley/go-metrics/exp/exp.go
new file mode 100644
index 000000000..11dd3f898
--- /dev/null
+++ b/vendor/github.com/rcrowley/go-metrics/exp/exp.go
@@ -0,0 +1,156 @@
+// Hook go-metrics into expvar
+// on any /debug/metrics request, load all vars from the registry into expvar, and execute regular expvar handler
+package exp
+
+import (
+	"expvar"
+	"fmt"
+	"net/http"
+	"sync"
+
+	"github.com/rcrowley/go-metrics"
+)
+
+type exp struct {
+	expvarLock sync.Mutex // expvar panics if you try to register the same var twice, so we must probe it safely
+	registry   metrics.Registry
+}
+
+func (exp *exp) expHandler(w http.ResponseWriter, r *http.Request) {
+	// load our variables into expvar
+	exp.syncToExpvar()
+
+	// now just run the official expvar handler code (which is not publicly callable, so pasted inline)
+	w.Header().Set("Content-Type", "application/json; charset=utf-8")
+	fmt.Fprintf(w, "{\n")
+	first := true
+	expvar.Do(func(kv expvar.KeyValue) {
+		if !first {
+			fmt.Fprintf(w, ",\n")
+		}
+		first = false
+		fmt.Fprintf(w, "%q: %s", kv.Key, kv.Value)
+	})
+	fmt.Fprintf(w, "\n}\n")
+}
+
+// Exp will register an expvar powered metrics handler with http.DefaultServeMux on "/debug/vars"
+func Exp(r metrics.Registry) {
+	h := ExpHandler(r)
+	// this would cause a panic:
+	// panic: http: multiple registrations for /debug/vars
+	// http.HandleFunc("/debug/vars", e.expHandler)
+	// haven't found an elegant way, so just use a different endpoint
+	http.Handle("/debug/metrics", h)
+}
+
+// ExpHandler will return an expvar powered metrics handler.
+func ExpHandler(r metrics.Registry) http.Handler {
+	e := exp{sync.Mutex{}, r}
+	return http.HandlerFunc(e.expHandler)
+}
+
+func (exp *exp) getInt(name string) *expvar.Int {
+	var v *expvar.Int
+	exp.expvarLock.Lock()
+	p := expvar.Get(name)
+	if p != nil {
+		v = p.(*expvar.Int)
+	} else {
+		v = new(expvar.Int)
+		expvar.Publish(name, v)
+	}
+	exp.expvarLock.Unlock()
+	return v
+}
+
+func (exp *exp) getFloat(name string) *expvar.Float {
+	var v *expvar.Float
+	exp.expvarLock.Lock()
+	p := expvar.Get(name)
+	if p != nil {
+		v = p.(*expvar.Float)
+	} else {
+		v = new(expvar.Float)
+		expvar.Publish(name, v)
+	}
+	exp.expvarLock.Unlock()
+	return v
+}
+
+func (exp *exp) publishCounter(name string, metric metrics.Counter) {
+	v := exp.getInt(name)
+	v.Set(metric.Count())
+}
+
+func (exp *exp) publishGauge(name string, metric metrics.Gauge) {
+	v := exp.getInt(name)
+	v.Set(metric.Value())
+}
+func (exp *exp) publishGaugeFloat64(name string, metric metrics.GaugeFloat64) {
+	exp.getFloat(name).Set(metric.Value())
+}
+
+func (exp *exp) publishHistogram(name string, metric metrics.Histogram) {
+	h := metric.Snapshot()
+	ps := h.Percentiles([]float64{0.5, 0.75, 0.95, 0.99, 0.999})
+	exp.getInt(name + ".count").Set(h.Count())
+	exp.getFloat(name + ".min").Set(float64(h.Min()))
+	exp.getFloat(name + ".max").Set(float64(h.Max()))
+	exp.getFloat(name + ".mean").Set(float64(h.Mean()))
+	exp.getFloat(name + ".std-dev").Set(float64(h.StdDev()))
+	exp.getFloat(name + ".50-percentile").Set(float64(ps[0]))
+	exp.getFloat(name + ".75-percentile").Set(float64(ps[1]))
+	exp.getFloat(name + ".95-percentile").Set(float64(ps[2]))
+	exp.getFloat(name + ".99-percentile").Set(float64(ps[3]))
+	exp.getFloat(name + ".999-percentile").Set(float64(ps[4]))
+}
+
+func (exp *exp) publishMeter(name string, metric metrics.Meter) {
+	m := metric.Snapshot()
+	exp.getInt(name + ".count").Set(m.Count())
+	exp.getFloat(name + ".one-minute").Set(float64(m.Rate1()))
+	exp.getFloat(name + ".five-minute").Set(float64(m.Rate5()))
+	exp.getFloat(name + ".fifteen-minute").Set(float64((m.Rate15())))
+	exp.getFloat(name + ".mean").Set(float64(m.RateMean()))
+}
+
+func (exp *exp) publishTimer(name string, metric metrics.Timer) {
+	t := metric.Snapshot()
+	ps := t.Percentiles([]float64{0.5, 0.75, 0.95, 0.99, 0.999})
+	exp.getInt(name + ".count").Set(t.Count())
+	exp.getFloat(name + ".min").Set(float64(t.Min()))
+	exp.getFloat(name + ".max").Set(float64(t.Max()))
+	exp.getFloat(name + ".mean").Set(float64(t.Mean()))
+	exp.getFloat(name + ".std-dev").Set(float64(t.StdDev()))
+	exp.getFloat(name + ".50-percentile").Set(float64(ps[0]))
+	exp.getFloat(name + ".75-percentile").Set(float64(ps[1]))
+	exp.getFloat(name + ".95-percentile").Set(float64(ps[2]))
+	exp.getFloat(name + ".99-percentile").Set(float64(ps[3]))
+	exp.getFloat(name + ".999-percentile").Set(float64(ps[4]))
+	exp.getFloat(name + ".one-minute").Set(float64(t.Rate1()))
+	exp.getFloat(name + ".five-minute").Set(float64(t.Rate5()))
+	exp.getFloat(name + ".fifteen-minute").Set(float64((t.Rate15())))
+	exp.getFloat(name + ".mean-rate").Set(float64(t.RateMean()))
+}
+
+func (exp *exp) syncToExpvar() {
+	exp.registry.Each(func(name string, i interface{}) {
+		switch i.(type) {
+		case metrics.Counter:
+			exp.publishCounter(name, i.(metrics.Counter))
+		case metrics.Gauge:
+			exp.publishGauge(name, i.(metrics.Gauge))
+		case metrics.GaugeFloat64:
+			exp.publishGaugeFloat64(name, i.(metrics.GaugeFloat64))
+		case metrics.Histogram:
+			exp.publishHistogram(name, i.(metrics.Histogram))
+		case metrics.Meter:
+			exp.publishMeter(name, i.(metrics.Meter))
+		case metrics.Timer:
+			exp.publishTimer(name, i.(metrics.Timer))
+		default:
+			panic(fmt.Sprintf("unsupported type for '%s': %T", name, i))
+		}
+	})
+}