Ensure traverse is cancelable even if it's sending a tNode.

fasaxc · fasaxc · commit d2b2290a45db · 2017-07-20T11:57:23.000+01:00
diff --git a/trie/ctrie/ctrie.go b/trie/ctrie/ctrie.go
@@ -406,7 +406,11 @@ func (c *Ctrie) traverse(i *iNode, ch chan<- *Entry, cancel <-chan struct{}) err
 			}
 		}
 	case main.tNode != nil:
-		ch <- main.tNode.Entry
+		select {
+		case ch <- main.tNode.Entry:
+		case <-cancel:
+			return errCanceled
+		}
 	}
 	return nil
 }

Original file line number	Diff line number	Diff line change
`@@ -406,7 +406,11 @@ func (c Ctrie) traverse(i iNode, ch chan<- *Entry, cancel <-chan struct{}) err`
`406`	`406`	`}`
`407`	`407`	`}`
`408`	`408`	`case main.tNode != nil:`
`409`		`- ch <- main.tNode.Entry`
	`409`	`+ select {`
	`410`	`+ case ch <- main.tNode.Entry:`
	`411`	`+ case <-cancel:`
	`412`	`+ return errCanceled`
	`413`	`+ }`
`410`	`414`	`}`
`411`	`415`	`return nil`
`412`	`416`	`}`