node: IPC transport hangs on large responses

[ryanschneider]

go-ethlibs/node/ipc.go

Line 18 in 61f7907

scanner := bufio.NewScanner(conn)

For example this code pointed to a yolov3x node never returns from BlockByNumber:

func main() {
	ctx := context.Background()
	url := "~/Library/Ethereum/yolo-v3/geth.ipc"
	client, err := node.NewClient(ctx, url)
	if err != nil {
		panic(err)
	}

	start := uint64(0x3ede)
	log.Printf("[WARN] start: %d", start)
	block, err := client.BlockByNumber(ctx, start, true)
	if err != nil {
		panic(err)
	} else {
		log.Printf("[INFO] block: %#v", *block)
	}
}

Haven't full debugged it but my guess is either the scanner fails and we don't handle the error correctly or the scanner hangs.