bridgedb now listens for connections, performs a function

src/bin/bridgedb.rs

@@ -1,12 +1,22 @@
+// This seems like probably not the best way to do this, but it works.
+#[path = "../server_net.rs"]
+mod server_net;
+use crate::server_net::listen;
+
 use lox::BridgeDb;
+use std::env::args;
 use std::fs::File;
 use std::io::Write;
 use std::path::Path;
 
-fn main() {
+#[tokio::main]
+async fn main() {
     let bridgedb_filename = "bridgedb.json";
     let bridgedb_pubkey_filename = "bridgedb_pubkey.json";
 
+    // network address to listen on, e.g., localhost:8181
+    let addr = args().nth(1).unwrap();
+
     // If bridgedb has already been created, recreate it from file.
     // Otherwise, create new bridgedb.
     let bridgedb = if Path::new(bridgedb_filename).exists() {
@@ -38,4 +48,10 @@ fn main() {
         )
         .expect("Failed to write to bridgedb pubkey file");
     }
+
+    listen(addr, to_uppercase).await;
+}
+
+fn to_uppercase(str: String) -> String {
+    str.to_uppercase()
 }