From bc9bef6ec16b9c852134b1f3f54f53ed49114a86 Mon Sep 17 00:00:00 2001
From: Aditya Kulkarni <zcash@adityapk.com>
Date: Thu, 31 Oct 2019 14:56:45 -0700
Subject: [PATCH] Handle resolution errors at startup

---
 lib/src/lightclient.rs | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/lib/src/lightclient.rs b/lib/src/lightclient.rs
index 823720d..1fd62a1 100644
--- a/lib/src/lightclient.rs
+++ b/lib/src/lightclient.rs
@@ -75,6 +75,13 @@ impl LightClientConfig {
     }
 
     pub fn create(server: http::Uri, dangerous: bool) -> io::Result<(LightClientConfig, u64)> {
+        use std::net::ToSocketAddrs;
+        // Test for a connection first
+        format!("{}:{}", server.host().unwrap(), server.port_part().unwrap())
+            .to_socket_addrs()?
+            .next()
+            .ok_or(std::io::Error::new(ErrorKind::ConnectionRefused, "Couldn't resolve server!"))?;
+
         // Do a getinfo first, before opening the wallet
         let info = grpcconnector::get_info(server.clone(), dangerous)
             .map_err(|e| std::io::Error::new(ErrorKind::ConnectionRefused, e))?;