feat: remove unused metrics (#208)

This drops the opensensus dependency. Nobody uses this, from what I can
tell.

fixes #58

go.mod

@@ -17,5 +17,4 @@ require (
 	github.com/multiformats/go-multiaddr v0.2.2
 	github.com/multiformats/go-multihash v0.0.14
 	github.com/multiformats/go-varint v0.0.6
-	go.opencensus.io v0.22.4
 )

go.sum

@@ -1,5 +1,3 @@
-cloud.google.com/go v0.26.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw=
-github.com/BurntSushi/toml v0.3.1/go.mod h1:xHWCNGjB5oqiDr8zfno3MHue2Ht5sIBksp03qcyfWMU=
 github.com/aead/siphash v1.0.1/go.mod h1:Nywa3cDsYNNK3gaciGTWPwHt0wlpNV15vwmswBAUSII=
 github.com/btcsuite/btcd v0.20.1-beta h1:Ik4hyJqN8Jfyv3S4AGBOmyouMsYE3EdYODkMbQjwPGw=
 github.com/btcsuite/btcd v0.20.1-beta/go.mod h1:wVuoA8VJLEcwgqHBwHmzLRazpKxTv13Px/pDuV7OomQ=
@@ -10,23 +8,14 @@ github.com/btcsuite/goleveldb v0.0.0-20160330041536-7834afc9e8cd/go.mod h1:F+uVa
 github.com/btcsuite/snappy-go v0.0.0-20151229074030-0bdef8d06723/go.mod h1:8woku9dyThutzjeg+3xrA5iCpBRH8XEEg3lh6TiUghc=
 github.com/btcsuite/websocket v0.0.0-20150119174127-31079b680792/go.mod h1:ghJtEyQwv5/p4Mg4C0fgbePVuGr935/5ddU9Z3TmDRY=
 github.com/btcsuite/winsvc v1.0.0/go.mod h1:jsenWakMcC0zFBFurPLEAyrnc/teJEM1O46fmI40EZs=
-github.com/client9/misspell v0.3.4/go.mod h1:qj6jICC3Q7zFZvVWo7KLAzC3yx5G7kyvSDkc90ppPyw=
 github.com/coreos/go-semver v0.3.0 h1:wkHLiw0WNATZnSG7epLsujiMCgPAc9xhjJ4tgnAxmfM=
 github.com/coreos/go-semver v0.3.0/go.mod h1:nnelYz7RCh+5ahJtPPxZlU+153eP4D4r3EedlOD2RNk=
+github.com/davecgh/go-spew v0.0.0-20171005155431-ecdeabc65495 h1:6IyqGr3fnd0tM3YxipK27TUskaOVUjU2nG45yzwcQKY=
 github.com/davecgh/go-spew v0.0.0-20171005155431-ecdeabc65495/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
-github.com/davecgh/go-spew v1.1.0 h1:ZDRjVQ15GmhC3fiQ8ni8+OwkZQO4DARzQgrnXU1Liz8=
-github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
 github.com/fsnotify/fsnotify v1.4.7/go.mod h1:jwhsz4b93w/PPRr/qN1Yymfu8t87LnFCMoQvtojpjFo=
 github.com/gogo/protobuf v1.3.1 h1:DqDEcV5aeaTmdFBePNpYsp3FlcVH/2ISVVM9Qf8PSls=
 github.com/gogo/protobuf v1.3.1/go.mod h1:SlYgWuQ5SjCEi6WLHjHCa1yvBfUnHcTbrrZtXPKa29o=
-github.com/golang/glog v0.0.0-20160126235308-23def4e6c14b/go.mod h1:SBH7ygxi8pfUlaOkMMuAQtPIUF8ecWP5IEl/CR7VP2Q=
-github.com/golang/groupcache v0.0.0-20190702054246-869f871628b6 h1:ZgQEtGgCBiWRM39fZuwSd1LwSqqSW0hOdXCYYDX0R3I=
-github.com/golang/groupcache v0.0.0-20190702054246-869f871628b6/go.mod h1:cIg4eruTrX1D+g88fzRXU5OdNfaM+9IcxsU14FzY7Hc=
-github.com/golang/mock v1.1.1/go.mod h1:oTYuIxOrZwtPieC+H1uAHpcLFnEyAGVDL/k47Jfbm0A=
 github.com/golang/protobuf v1.2.0/go.mod h1:6lQm79b+lXiMfvg/cZm0SGofjICqVBUtrP5yJMmIC1U=
-github.com/golang/protobuf v1.3.1/go.mod h1:6lQm79b+lXiMfvg/cZm0SGofjICqVBUtrP5yJMmIC1U=
-github.com/google/go-cmp v0.3.0 h1:crn/baboCvb5fXaQ0IJ1SGTsTVrWpDsCWC8EGETZijY=
-github.com/google/go-cmp v0.3.0/go.mod h1:8QqcDgzrUqlUb/G2PQTWiueGozuR1884gddMywk6iLU=
 github.com/hpcloud/tail v1.0.0/go.mod h1:ab1qPbhIpdTxEkNHXyeSf5vhxWSCs/tWer42PpOxQnU=
 github.com/ipfs/go-cid v0.0.7 h1:ysQJVJA3fNDF1qigJbsSQOdjhVLsOEoPdh0+R97k3jY=
 github.com/ipfs/go-cid v0.0.7/go.mod h1:6Ux9z5e+HpkQdckYoX1PG/6xqKspzlEIR5SDmgqgC/I=
@@ -72,59 +61,27 @@ github.com/multiformats/go-varint v0.0.6/go.mod h1:3Ls8CIEsrijN6+B7PbrXRPxHRPuXS
 github.com/onsi/ginkgo v1.6.0/go.mod h1:lLunBs/Ym6LB5Z9jYTR76FiuTmxDTDusOGeTQH+WWjE=
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 github.com/onsi/gomega v1.4.3/go.mod h1:ex+gbHU/CVuBBDIJjb2X0qEXbFg53c61hWP/1CpauHY=
-github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
 github.com/spacemonkeygo/spacelog v0.0.0-20180420211403-2296661a0572 h1:RC6RW7j+1+HkWaX/Yh71Ee5ZHaHYt7ZP4sQgUrm6cDU=
 github.com/spacemonkeygo/spacelog v0.0.0-20180420211403-2296661a0572/go.mod h1:w0SWMsp6j9O/dk4/ZpIhL+3CkG8ofA2vuv7k+ltqUMc=
 github.com/spaolacci/murmur3 v1.1.0 h1:7c1g84S4BPRrfL5Xrdp6fOJ206sU9y293DDHaoy0bLI=
 github.com/spaolacci/murmur3 v1.1.0/go.mod h1:JwIasOWyU6f++ZhiEuf87xNszmSA2myDM2Kzu9HwQUA=
-github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
-github.com/stretchr/testify v1.4.0/go.mod h1:j7eGeouHqKxXV5pUuKE4zz7dFj8WfuZ+81PSLYec5m4=
-go.opencensus.io v0.22.4 h1:LYy1Hy3MJdrCdMwwzxA/dRok4ejH+RwNGbuoD9fCjto=
-go.opencensus.io v0.22.4/go.mod h1:yxeiOL68Rb0Xd1ddK5vPZ/oVn4vY4Ynel7k9FzqtOIw=
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metrics/register.go

@@ -1,70 +0,0 @@
-package metrics
-
-import (
-	"fmt"
-	"sync"
-
-	"go.opencensus.io/stats/view"
-)
-
-var registeredViews = map[string][]*view.View{}
-var mu = new(sync.Mutex)
-
-type ErrNamespace struct {
-	Namespace string
-}
-
-// ErrUnregisteredNamespace is an error for lookup of requested unregistered Namespace
-type ErrUnregisteredNamespace ErrNamespace
-
-func (e ErrUnregisteredNamespace) Error() string {
-	return fmt.Sprintf("no views found registered under Namespace %s", e.Namespace)
-}
-
-// ErrDuplicateNamespaceRegistration is an error for a Namespace that has already
-// registered views
-type ErrDuplicateNamespaceRegistration ErrNamespace
-
-func (e ErrDuplicateNamespaceRegistration) Error() string {
-	return fmt.Sprintf("duplicate registration of views by Namespace %s", e.Namespace)
-}
-
-// RegisterViews accepts a namespace and a slice of Views, which will be registered
-// with opencensus and maintained in the global registered views map
-func RegisterViews(namespace string, views ...*view.View) error {
-	mu.Lock()
-	defer mu.Unlock()
-	_, ok := registeredViews[namespace]
-	if ok {
-		return ErrDuplicateNamespaceRegistration{Namespace: namespace}
-	} else {
-		registeredViews[namespace] = views
-	}
-
-	return nil
-}
-
-// LookupViews returns all views for a Namespace name. Returns an error if the
-// Namespace has not been registered.
-func LookupViews(name string) ([]*view.View, error) {
-	mu.Lock()
-	defer mu.Unlock()
-	views, ok := registeredViews[name]
-	if !ok {
-		return nil, ErrUnregisteredNamespace{Namespace: name}
-	}
-	response := make([]*view.View, len(views))
-	copy(response, views)
-	return response, nil
-}
-
-// AllViews returns all registered views as a single slice
-func AllViews() []*view.View {
-	var views []*view.View
-	mu.Lock()
-	defer mu.Unlock()
-	for _, vs := range registeredViews {
-		views = append(views, vs...)
-	}
-	return views
-}

metrics/register_test.go

@@ -1,94 +0,0 @@
-package metrics
-
-import (
-	"fmt"
-	"go.opencensus.io/stats"
-	"testing"
-
-	"go.opencensus.io/stats/view"
-)
-
-func newTestMeasure(name string) stats.Measure {
-	return stats.Int64(fmt.Sprintf("test/measure/%s", name),
-		fmt.Sprintf("Test measurement %s", name),
-		stats.UnitDimensionless,
-	)
-}
-
-func newTestView(name string) *view.View {
-	return &view.View{
-		Name:        fmt.Sprintf("test/%s", name),
-		Description: fmt.Sprintf("Test view %s", name),
-		Measure:     newTestMeasure(name),
-		Aggregation: view.LastValue(),
-	}
-}
-
-func TestRegisteringViews(t *testing.T) {
-	registeredViews = make(map[string][]*view.View)
-
-	t.Run("test registering first views", func(t *testing.T) {
-		testView := newTestView("empty-map-0")
-
-		if err := RegisterViews("test", testView); err != nil {
-			t.Fatal("unable to register view in empty map", err)
-		}
-	})
-
-	t.Run("test registering with existing views", func(t *testing.T) {
-		testView := newTestView("empty-map-1")
-		testView2 := newTestView("existing-entity-0")
-
-		if err := RegisterViews("test2", testView); err != nil {
-			t.Fatal("unable to register view in empty map", err)
-		}
-		if err := RegisterViews("test3", testView2); err != nil {
-			t.Fatal("unable to register view in map", err)
-		}
-	})
-
-	t.Run("test registering duplicate views", func(t *testing.T) {
-		testView := newTestView("empty-map-2")
-		testView2 := newTestView("existing-entity-1")
-
-		if err := RegisterViews("test4", testView); err != nil {
-			t.Fatal("unable to register view in empty map", err)
-		}
-		if err := RegisterViews("test4", testView2); err == nil {
-			t.Fatal("allowed duplicate view registration")
-		}
-	})
-
-	t.Run("test looking up views", func(t *testing.T) {
-		testView := newTestView("empty-map-3")
-
-		if err := RegisterViews("test5", testView); err != nil {
-			t.Fatal("unable to register view in empty map", err)
-		}
-
-		views, err := LookupViews("test5")
-		if err != nil {
-			t.Fatal("error looking up views", err)
-		}
-
-		if views[0].Name != testView.Name {
-			t.Fatal("incorrect view lookup, received name:", views[0].Name)
-		}
-	})
-}
-
-func TestAllViews(t *testing.T) {
-	registeredViews = make(map[string][]*view.View)
-	t.Run("test retrieving all views", func(t *testing.T) {
-		views := []*view.View{newTestView("all-views-0"), newTestView("all-views-1"), newTestView("all-views-2")}
-
-		if err := RegisterViews("test6", views...); err != nil {
-			t.Fatal("unable to register multiple views at once", err)
-		}
-
-		allViews := AllViews()
-		if len(allViews) != len(views) {
-			t.Fatalf("didn't receive equal number of views: %d %d", len(views), len(allViews))
-		}
-	})
-}