only prepend unix when using uds

Author: stuqdog

src/viam/sdk/rpc/dial.cpp

@@ -1,3 +1,4 @@
+#include <algorithm>
 #include <viam/sdk/rpc/dial.hpp>
 
 #include <istream>
@@ -148,20 +149,27 @@ std::shared_ptr<ViamChannel> ViamChannel::dial(const char* uri,
     if (opts.entity()) {
         entity = opts.entity()->c_str();
     }
-    char* socket_path = ::dial(
+    char* proxy_path = ::dial(
         uri, entity, type, payload, opts.allows_insecure_downgrade(), float_timeout.count(), ptr);
-    if (socket_path == NULL) {
+    if (proxy_path == NULL) {
         free_rust_runtime(ptr);
         throw Exception(ErrorCondition::k_connection, "Unable to establish connecting path");
     }
 
-    std::string address("unix://");
-    address += socket_path;
+    std::string localhost_prefix("127.0.0.1");
+    auto tcp_check = std::mismatch(localhost_prefix.begin(), localhost_prefix.end(), proxy_path);
+    std::string address;
+    if (tcp_check.first != localhost_prefix.end()) {
+        // proxy path is not a localhost address and is therefore a UDS socket
+        address += "unix://";
+    }
+    address += proxy_path;
+
     const std::shared_ptr<grpc::Channel> channel =
         impl::create_viam_channel(address, grpc::InsecureChannelCredentials());
     const std::unique_ptr<viam::robot::v1::RobotService::Stub> st =
         viam::robot::v1::RobotService::NewStub(channel);
-    return std::make_shared<ViamChannel>(channel, socket_path, ptr);
+    return std::make_shared<ViamChannel>(channel, proxy_path, ptr);
 };
 
 unsigned int Options::refresh_interval() const {