fix nil pointer deref when publisher does not exist

Richard Patel · Richard Patel · commit 61470d792477 · 2022-03-04T15:01:23.000+01:00
diff --git a/balance.go b/balance.go
@@ -59,8 +59,12 @@ func (b *balanceScraper) update(ctx context.Context) {
 		return
 	}
 	for i, acc := range res.Value {
+		var balance float64
+		if acc != nil {
+			balance = float64(acc.Lamports)
+		}
 		b.GaugeVec.
 			WithLabelValues(b.publishers[i].String()).
-			Set(float64(acc.Lamports))
+			Set(balance)
 	}
 }

Original file line number	Diff line number	Diff line change
`@@ -59,8 +59,12 @@ func (b *balanceScraper) update(ctx context.Context) {`
`59`	`59`	`return`
`60`	`60`	`}`
`61`	`61`	`for i, acc := range res.Value {`
	`62`	`+ var balance float64`
	`63`	`+ if acc != nil {`
	`64`	`+ balance = float64(acc.Lamports)`
	`65`	`+ }`
`62`	`66`	`b.GaugeVec.`
`63`	`67`	`WithLabelValues(b.publishers[i].String()).`
`64`		`- Set(float64(acc.Lamports))`
	`68`	`+ Set(balance)`
`65`	`69`	`}`
`66`	`70`	`}`