vendor: upgrade github.com/armon/go-metrics

Pull in changes to fix race condition for concurrent tests.

vendor/github.com/armon/go-metrics/README.md

@@ -28,39 +28,42 @@ Examples
 
 Here is an example of using the package:
 
-    func SlowMethod() {
-        // Profiling the runtime of a method
-        defer metrics.MeasureSince([]string{"SlowMethod"}, time.Now())
-    }
+```go
+func SlowMethod() {
+    // Profiling the runtime of a method
+    defer metrics.MeasureSince([]string{"SlowMethod"}, time.Now())
+}
 
-    // Configure a statsite sink as the global metrics sink
-    sink, _ := metrics.NewStatsiteSink("statsite:8125")
-    metrics.NewGlobal(metrics.DefaultConfig("service-name"), sink)
+// Configure a statsite sink as the global metrics sink
+sink, _ := metrics.NewStatsiteSink("statsite:8125")
+metrics.NewGlobal(metrics.DefaultConfig("service-name"), sink)
 
-    // Emit a Key/Value pair
-    metrics.EmitKey([]string{"questions", "meaning of life"}, 42)
+// Emit a Key/Value pair
+metrics.EmitKey([]string{"questions", "meaning of life"}, 42)
+```
 
+Here is an example of setting up a signal handler:
 
-Here is an example of setting up an signal handler:
+```go
+// Setup the inmem sink and signal handler
+inm := metrics.NewInmemSink(10*time.Second, time.Minute)
+sig := metrics.DefaultInmemSignal(inm)
+metrics.NewGlobal(metrics.DefaultConfig("service-name"), inm)
 
-    // Setup the inmem sink and signal handler
-    inm := metrics.NewInmemSink(10*time.Second, time.Minute)
-    sig := metrics.DefaultInmemSignal(inm)
-    metrics.NewGlobal(metrics.DefaultConfig("service-name"), inm)
+// Run some code
+inm.SetGauge([]string{"foo"}, 42)
+inm.EmitKey([]string{"bar"}, 30)
 
-    // Run some code
-    inm.SetGauge([]string{"foo"}, 42)
-    inm.EmitKey([]string{"bar"}, 30)
+inm.IncrCounter([]string{"baz"}, 42)
+inm.IncrCounter([]string{"baz"}, 1)
+inm.IncrCounter([]string{"baz"}, 80)
 
-    inm.IncrCounter([]string{"baz"}, 42)
-    inm.IncrCounter([]string{"baz"}, 1)
-    inm.IncrCounter([]string{"baz"}, 80)
+inm.AddSample([]string{"method", "wow"}, 42)
+inm.AddSample([]string{"method", "wow"}, 100)
+inm.AddSample([]string{"method", "wow"}, 22)
 
-    inm.AddSample([]string{"method", "wow"}, 42)
-    inm.AddSample([]string{"method", "wow"}, 100)
-    inm.AddSample([]string{"method", "wow"}, 22)
-
-    ....
+....
+```
 
 When a signal comes in, output like the following will be dumped to stderr:
 

vendor/github.com/armon/go-metrics/inmem.go

@@ -3,6 +3,7 @@ package metrics
 import (
 	"fmt"
 	"math"
+	"net/url"
 	"strings"
 	"sync"
 	"time"
@@ -25,7 +26,7 @@ type InmemSink struct {
 	// intervals is a slice of the retained intervals
 	intervals    []*IntervalMetrics
 	intervalLock sync.RWMutex
-	
+
 	rateDenom float64
 }
 
@@ -68,7 +69,7 @@ func NewIntervalMetrics(intv time.Time) *IntervalMetrics {
 // about a sample
 type AggregateSample struct {
 	Count       int       // The count of emitted pairs
-	Rate	        float64   // The count of emitted pairs per time unit (usually 1 second)
+	Rate        float64   // The count of emitted pairs per time unit (usually 1 second)
 	Sum         float64   // The sum of values
 	SumSq       float64   // The sum of squared values
 	Min         float64   // Minimum value
@@ -105,7 +106,7 @@ func (a *AggregateSample) Ingest(v float64, rateDenom float64) {
 	if v > a.Max || a.Count == 1 {
 		a.Max = v
 	}
-	a.Rate = float64(a.Count)/rateDenom
+	a.Rate = float64(a.Count) / rateDenom
 	a.LastUpdated = time.Now()
 }
 
@@ -120,6 +121,24 @@ func (a *AggregateSample) String() string {
 	}
 }
 
+// NewInmemSinkFromURL creates an InmemSink from a URL. It is used
+// (and tested) from NewMetricSinkFromURL.
+func NewInmemSinkFromURL(u *url.URL) (MetricSink, error) {
+	params := u.Query()
+
+	interval, err := time.ParseDuration(params.Get("interval"))
+	if err != nil {
+		return nil, fmt.Errorf("Bad 'interval' param: %s", err)
+	}
+
+	retain, err := time.ParseDuration(params.Get("retain"))
+	if err != nil {
+		return nil, fmt.Errorf("Bad 'retain' param: %s", err)
+	}
+
+	return NewInmemSink(interval, retain), nil
+}
+
 // NewInmemSink is used to construct a new in-memory sink.
 // Uses an aggregation interval and maximum retention period.
 func NewInmemSink(interval, retain time.Duration) *InmemSink {
@@ -128,7 +147,7 @@ func NewInmemSink(interval, retain time.Duration) *InmemSink {
 		interval:     interval,
 		retain:       retain,
 		maxIntervals: int(retain / interval),
-		rateDenom: float64(interval.Nanoseconds()) / float64(rateTimeUnit.Nanoseconds()),
+		rateDenom:    float64(interval.Nanoseconds()) / float64(rateTimeUnit.Nanoseconds()),
 	}
 	i.intervals = make([]*IntervalMetrics, 0, i.maxIntervals)
 	return i

vendor/github.com/armon/go-metrics/sink.go

@@ -1,5 +1,10 @@
 package metrics
 
+import (
+	"fmt"
+	"net/url"
+)
+
 // The MetricSink interface is used to transmit metrics information
 // to an external system
 type MetricSink interface {
@@ -50,3 +55,43 @@ func (fh FanoutSink) AddSample(key []string, val float32) {
 		s.AddSample(key, val)
 	}
 }
+
+// sinkURLFactoryFunc is an generic interface around the *SinkFromURL() function provided
+// by each sink type
+type sinkURLFactoryFunc func(*url.URL) (MetricSink, error)
+
+// sinkRegistry supports the generic NewMetricSink function by mapping URL
+// schemes to metric sink factory functions
+var sinkRegistry = map[string]sinkURLFactoryFunc{
+	"statsd":   NewStatsdSinkFromURL,
+	"statsite": NewStatsiteSinkFromURL,
+	"inmem":    NewInmemSinkFromURL,
+}
+
+// NewMetricSinkFromURL allows a generic URL input to configure any of the
+// supported sinks. The scheme of the URL identifies the type of the sink, the
+// and query parameters are used to set options.
+//
+// "statsd://" - Initializes a StatsdSink. The host and port are passed through
+// as the "addr" of the sink
+//
+// "statsite://" - Initializes a StatsiteSink. The host and port become the
+// "addr" of the sink
+//
+// "inmem://" - Initializes an InmemSink. The host and port are ignored. The
+// "interval" and "duration" query parameters must be specified with valid
+// durations, see NewInmemSink for details.
+func NewMetricSinkFromURL(urlStr string) (MetricSink, error) {
+	u, err := url.Parse(urlStr)
+	if err != nil {
+		return nil, err
+	}
+
+	sinkURLFactoryFunc := sinkRegistry[u.Scheme]
+	if sinkURLFactoryFunc == nil {
+		return nil, fmt.Errorf(
+			"cannot create metric sink, unrecognized sink name: %q", u.Scheme)
+	}
+
+	return sinkURLFactoryFunc(u)
+}

vendor/github.com/armon/go-metrics/start.go

@@ -26,10 +26,11 @@ type Metrics struct {
 }
 
 // Shared global metrics instance
-var global atomic.Value
+var globalMetrics atomic.Value // *Metrics
 
 func init() {
-	global.Store(&Metrics{sink: &BlackholeSink{}})
+	// Initialize to a blackhole sink to avoid errors
+	globalMetrics.Store(&Metrics{sink: &BlackholeSink{}})
 }
 
 // DefaultConfig provides a sane default configuration
@@ -68,28 +69,28 @@ func New(conf *Config, sink MetricSink) (*Metrics, error) {
 func NewGlobal(conf *Config, sink MetricSink) (*Metrics, error) {
 	metrics, err := New(conf, sink)
 	if err == nil {
-		global.Store(metrics)
+		globalMetrics.Store(metrics)
 	}
 	return metrics, err
 }
 
 // Proxy all the methods to the globalMetrics instance
 func SetGauge(key []string, val float32) {
-	global.Load().(*Metrics).SetGauge(key, val)
+	globalMetrics.Load().(*Metrics).SetGauge(key, val)
 }
 
 func EmitKey(key []string, val float32) {
-	global.Load().(*Metrics).EmitKey(key, val)
+	globalMetrics.Load().(*Metrics).EmitKey(key, val)
 }
 
 func IncrCounter(key []string, val float32) {
-	global.Load().(*Metrics).IncrCounter(key, val)
+	globalMetrics.Load().(*Metrics).IncrCounter(key, val)
 }
 
 func AddSample(key []string, val float32) {
-	global.Load().(*Metrics).AddSample(key, val)
+	globalMetrics.Load().(*Metrics).AddSample(key, val)
 }
 
 func MeasureSince(key []string, start time.Time) {
-	global.Load().(*Metrics).MeasureSince(key, start)
+	globalMetrics.Load().(*Metrics).MeasureSince(key, start)
 }

vendor/github.com/armon/go-metrics/statsd.go

@@ -5,6 +5,7 @@ import (
 	"fmt"
 	"log"
 	"net"
+	"net/url"
 	"strings"
 	"time"
 )
@@ -23,6 +24,12 @@ type StatsdSink struct {
 	metricQueue chan string
 }
 
+// NewStatsdSinkFromURL creates an StatsdSink from a URL. It is used
+// (and tested) from NewMetricSinkFromURL.
+func NewStatsdSinkFromURL(u *url.URL) (MetricSink, error) {
+	return NewStatsdSink(u.Host)
+}
+
 // NewStatsdSink is used to create a new StatsdSink
 func NewStatsdSink(addr string) (*StatsdSink, error) {
 	s := &StatsdSink{

vendor/github.com/armon/go-metrics/statsite.go

@@ -5,6 +5,7 @@ import (
 	"fmt"
 	"log"
 	"net"
+	"net/url"
 	"strings"
 	"time"
 )
@@ -16,6 +17,12 @@ const (
 	flushInterval = 100 * time.Millisecond
 )
 
+// NewStatsiteSinkFromURL creates an StatsiteSink from a URL. It is used
+// (and tested) from NewMetricSinkFromURL.
+func NewStatsiteSinkFromURL(u *url.URL) (MetricSink, error) {
+	return NewStatsiteSink(u.Host)
+}
+
 // StatsiteSink provides a MetricSink that can be used with a
 // statsite metrics server
 type StatsiteSink struct {

vendor/vendor.json

@@ -87,10 +87,10 @@
 			"revisionTime": "2015-08-27T00:49:46Z"
 		},
 		{
-			"checksumSHA1": "d6798KSc0jDg2MHNxKdgyNfMK7A=",
+			"checksumSHA1": "M+ZeYktTT2wak9ZvQ0OZBbIHAGo=",
 			"path": "github.com/armon/go-metrics",
-			"revision": "3df31a1ada83e310c2e24b267c8e8b68836547b4",
-			"revisionTime": "2016-07-17T04:34:58Z"
+			"revision": "f036747b9d0e8590f175a5d654a2194a7d9df4b5",
+			"revisionTime": "2017-06-01T21:44:32Z"
 		},
 		{
 			"checksumSHA1": "OmqT9Y1mAHvlAKeJh0jBHC9SH78=",