add MinTimestamp to tipset and test

filecoin-project · Jun 12, 2019 · 30da7c3 · 30da7c3
1 parent ebd469b
commit 30da7c3
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Showing 2 changed files with 18 additions and 0 deletions.
diff --git a/types/tipset.go b/types/tipset.go
@@ -119,6 +119,19 @@ func (ts TipSet) MinTicket() (Signature, error) {
 	return ts.blocks[0].Ticket, nil
 }
 
+func (ts TipSet) MinTimestamp() (Uint64, error) {
+	if len(ts.blocks) == 0 {
+		return 0, errUndefTipSet
+	}
+	min := ts.blocks[0].Timestamp
+	for i := 0; i < len(ts.blocks[0:]); i++ {
+		if ts.blocks[i].Timestamp < min {
+			min = ts.blocks[i].Timestamp
+		}
+	}
+	return min, nil
+}
+
 // Height returns the height of a tipset.
 func (ts TipSet) Height() (uint64, error) {
 	if len(ts.blocks) == 0 {

diff --git a/types/tipset_test.go b/types/tipset_test.go
@@ -121,6 +121,11 @@ func TestTipSet(t *testing.T) {
 		assert.Equal(t, b1.Ticket, tsTicket)
 	})
 
+	t.Run("min timestamp", func(t *testing.T) {
+		tsTime, _ := RequireNewTipSet(t, b1, b2, b3).MinTimestamp()
+		assert.Equal(t, b1.Timestamp, tsTime)
+	})
+
 	t.Run("equality", func(t *testing.T) {
 		ts1a := RequireNewTipSet(t, b3, b2, b1)
 		ts1b := RequireNewTipSet(t, b1, b2, b3)