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ethclient: harden against returned interface misuse #26976

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Merged
merged 1 commit into from
Mar 25, 2023
Merged

ethclient: harden against returned interface misuse #26976

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18 changes: 16 additions & 2 deletions ethclient/ethclient.go
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Original file line number Diff line number Diff line change
Expand Up @@ -320,7 +320,14 @@ func (ec *Client) SyncProgress(ctx context.Context) (*ethereum.SyncProgress, err
// SubscribeNewHead subscribes to notifications about the current blockchain head
// on the given channel.
func (ec *Client) SubscribeNewHead(ctx context.Context, ch chan<- *types.Header) (ethereum.Subscription, error) {
return ec.c.EthSubscribe(ctx, ch, "newHeads")
sub, err := ec.c.EthSubscribe(ctx, ch, "newHeads")
if err != nil {
// Defensively prefer returning nil interface explicitly on error-path, instead
// of letting default golang behavior wrap it with non-nil interface that stores
// nil concrete type value.
return nil, err
}
return sub, nil
}

// State Access
Expand Down Expand Up @@ -389,7 +396,14 @@ func (ec *Client) SubscribeFilterLogs(ctx context.Context, q ethereum.FilterQuer
if err != nil {
return nil, err
}
return ec.c.EthSubscribe(ctx, ch, "logs", arg)
sub, err := ec.c.EthSubscribe(ctx, ch, "logs", arg)
if err != nil {
// Defensively prefer returning nil interface explicitly on error-path, instead
// of letting default golang behavior wrap it with non-nil interface that stores
// nil concrete type value.
return nil, err
}
return sub, nil
}

func toFilterArg(q ethereum.FilterQuery) (interface{}, error) {
Expand Down