initial node parameters

node/src/main.rs

@@ -1,7 +1,14 @@
 use std::path::PathBuf;
+use std::net::SocketAddr;
+use std::net::ToSocketAddrs;
+
+use std::io;
 
 use structopt::StructOpt;
 
+pub const DEFAULT_PORT: u16 = 8443;
+const DEFAULT_PORT_STR: &str = "8443";
+
 #[derive(Debug, StructOpt)]
 enum Node {
     /// Run the node
@@ -14,16 +21,31 @@ enum Node {
         #[structopt(short = "d", long = "daemon")]
         daemon: bool,
 
-        #[structopt(short = "p", long = "port", default_value = "8443")]
+        /// Port on which to run the node
+        #[structopt(short = "p", long = "port", default_value = DEFAULT_PORT_STR)]
         port: u16,
 
+        /// Path in which to store node content
         #[structopt(long = "path", default_value = ".unnamed/node")]
         path: PathBuf,
+
+        /// Nodes to initially connect to
+        #[structopt(long = "initial_nodes", parse(try_from_str = parse_connection_address))]
+        initial_nodes: Vec<SocketAddr>,
     },
 }
 
+fn parse_connection_address(arg: &str) -> io::Result<SocketAddr> {
+    let mut addrs = arg.to_socket_addrs().or_else(|_| (arg, DEFAULT_PORT).to_socket_addrs())?;
+    Ok(addrs.next().expect("no socket addr"))
+}
+
 fn main() {
     let node = Node::from_args();
 
     println!("{:?}", node);
 }
+
+fn run() -> Result<(), ()> {
+    Ok(())
+}