utils/bag: print type of bag elements (ava-labs#1507)

Author: gyuho

snow/consensus/snowman/poll/early_term_no_traversal_test.go

@@ -57,9 +57,9 @@ func TestEarlyTermNoTraversalString(t *testing.T) {
 
 	poll.Vote(vdr1, vtxID)
 
-	expected := `waiting on Bag: (Size = 1)
+	expected := `waiting on Bag[ids.NodeID]: (Size = 1)
     NodeID-BaMPFdqMUQ46BV8iRcwbVfsam55kMqcp: 1
-received Bag: (Size = 1)
+received Bag[ids.ID]: (Size = 1)
     SYXsAycDPUu4z2ZksJD5fh5nTDcH3vCFHnpcVye5XuJ2jArg: 1`
 	if result := poll.String(); expected != result {
 		t.Fatalf("Poll should have returned %s but returned %s", expected, result)

snow/consensus/snowman/poll/no_early_term_test.go

@@ -53,9 +53,9 @@ func TestNoEarlyTermString(t *testing.T) {
 
 	poll.Vote(vdr1, vtxID)
 
-	expected := `waiting on Bag: (Size = 1)
+	expected := `waiting on Bag[ids.NodeID]: (Size = 1)
     NodeID-BaMPFdqMUQ46BV8iRcwbVfsam55kMqcp: 1
-received Bag: (Size = 1)
+received Bag[ids.ID]: (Size = 1)
     SYXsAycDPUu4z2ZksJD5fh5nTDcH3vCFHnpcVye5XuJ2jArg: 1`
 	if result := poll.String(); expected != result {
 		t.Fatalf("Poll should have returned %s but returned %s", expected, result)

snow/consensus/snowman/poll/set_test.go

@@ -316,9 +316,9 @@ func TestSetString(t *testing.T) {
 
 	expected := `current polls: (Size = 1)
     RequestID 0:
-        waiting on Bag: (Size = 1)
+        waiting on Bag[ids.NodeID]: (Size = 1)
             NodeID-6HgC8KRBEhXYbF4riJyJFLSHt37UNuRt: 1
-        received Bag: (Size = 0)`
+        received Bag[ids.ID]: (Size = 0)`
 	if !s.Add(0, vdrs) {
 		t.Fatalf("Should have been able to add a new poll")
 	} else if str := s.String(); expected != str {

utils/bag/bag.go

@@ -9,6 +9,7 @@ import (
 
 	"golang.org/x/exp/maps"
 
+	"github.com/ava-labs/avalanchego/utils"
 	"github.com/ava-labs/avalanchego/utils/set"
 )
 
@@ -154,10 +155,10 @@ func (b *Bag[T]) Remove(elt T) {
 	b.size -= count
 }
 
-func (b *Bag[_]) PrefixedString(prefix string) string {
+func (b *Bag[T]) PrefixedString(prefix string) string {
 	sb := strings.Builder{}
 
-	sb.WriteString(fmt.Sprintf("Bag: (Size = %d)", b.Len()))
+	sb.WriteString(fmt.Sprintf("Bag[%T]: (Size = %d)", utils.Zero[T](), b.Len()))
 	for elt, count := range b.counts {
 		sb.WriteString(fmt.Sprintf("\n%s    %v: %d", prefix, elt, count))
 	}

utils/bag/bag_test.go

@@ -152,7 +152,7 @@ func TestBagString(t *testing.T) {
 
 	bag.AddCount(elt0, 1337)
 
-	expected := "Bag: (Size = 1337)\n" +
+	expected := "Bag[int]: (Size = 1337)\n" +
 		"    123: 1337"
 
 	require.Equal(t, expected, bag.String())

utils/bag/unique_bag.go

@@ -9,6 +9,7 @@ import (
 
 	"golang.org/x/exp/maps"
 
+	"github.com/ava-labs/avalanchego/utils"
 	"github.com/ava-labs/avalanchego/utils/set"
 )
 
@@ -93,10 +94,10 @@ func (b *UniqueBag[T]) Bag(threshold int) Bag[T] {
 	return bag
 }
 
-func (b *UniqueBag[_]) PrefixedString(prefix string) string {
+func (b *UniqueBag[T]) PrefixedString(prefix string) string {
 	sb := strings.Builder{}
 
-	sb.WriteString(fmt.Sprintf("UniqueBag: (Size = %d)", len(*b)))
+	sb.WriteString(fmt.Sprintf("UniqueBag[%T]: (Size = %d)", utils.Zero[T](), len(*b)))
 	for key, set := range *b {
 		sb.WriteString(fmt.Sprintf("\n%s    %v: %s", prefix, key, set))
 	}