Make an initial dummy RPC call to check that the connection works

This provides a much better panic message if the RPC password is
incorrect.

diff --git a/src/bitcoind_client.rs b/src/bitcoind_client.rs
index 58510ae736bd894cbfece045db24ef4ddd9ded31..6d29ca06c924e188c6c8b0067abd6c1ff4ccb847 100644 (file)
--- a/src/bitcoind_client.rs
+++ b/src/bitcoind_client.rs
@@ -67,7 +67,10 @@ impl BitcoindClient {
                let http_endpoint = HttpEndpoint::for_host(host.clone()).with_port(port);
                let rpc_credentials =
                        base64::encode(format!("{}:{}", rpc_user.clone(), rpc_password.clone()));
-               let bitcoind_rpc_client = RpcClient::new(&rpc_credentials, http_endpoint)?;
+               let mut bitcoind_rpc_client = RpcClient::new(&rpc_credentials, http_endpoint)?;
+               let _dummy = bitcoind_rpc_client.call_method::<BlockchainInfo>("getblockchaininfo", &vec![]).await
+                       .map_err(|_| std::io::Error::new(std::io::ErrorKind::PermissionDenied,
+                               "Failed to make initial call to bitcoind - please check your RPC user/password and access settings"))?;
                let mut fees: HashMap<Target, AtomicU32> = HashMap::new();
                fees.insert(Target::Background, AtomicU32::new(253));
                fees.insert(Target::Normal, AtomicU32::new(2000));