From ef8ea37d26716869cd4572152ffedc047700f747 Mon Sep 17 00:00:00 2001
From: Bryan Newbold <bnewbold@robocracy.org>
Date: Mon, 22 Jan 2018 01:30:50 -0800
Subject: allow passing local_id to datconnect (and peer)

---
 src/bin/geniza-net.rs |  2 +-
 src/peer.rs           | 20 ++++++++++++++++++--
 src/protocol.rs       | 20 +++++++++++++++-----
 3 files changed, 34 insertions(+), 8 deletions(-)

diff --git a/src/bin/geniza-net.rs b/src/bin/geniza-net.rs
index b3a55ba..aeeef85 100644
--- a/src/bin/geniza-net.rs
+++ b/src/bin/geniza-net.rs
@@ -62,7 +62,7 @@ fn run() -> Result<()> {
             let dat_key = subm.value_of("dat_key").unwrap();
             let key_bytes = parse_dat_address(&dat_key)?;
             let key = Key::from_slice(&key_bytes).unwrap();
-            DatConnection::connect(host_port, &key, false)?;
+            DatConnection::connect(host_port, &key, false, None)?;
             println!("Done!");
         }
         ("discovery-key", Some(subm)) => {
diff --git a/src/peer.rs b/src/peer.rs
index 3310a13..c6f8c6d 100644
--- a/src/peer.rs
+++ b/src/peer.rs
@@ -85,14 +85,30 @@ fn worker_thread(mut dc: DatConnection, handle: u64, outbound_chan: chan::Receiv
 
 impl DatPeerThread {
 
-    pub fn connect<A: ToSocketAddrs + Display>(addr: A, feed_key: Key, handle: u64, is_live: bool, unified_chan: chan::Sender<Result<PeerMsg>>) -> Result<DatPeerThread> {
+    pub fn connect<A: ToSocketAddrs + Display>(addr: A, feed_key: Key, handle: u64, is_live: bool, local_id: Option<&[u8]>, unified_chan: chan::Sender<Result<PeerMsg>>) -> Result<DatPeerThread> {
 
         let addr = addr.to_socket_addrs().unwrap().nth(0).unwrap();
         let (outbound_chan, tx_chan) = chan::async();
         let feed_key2 = feed_key.clone();
+
+        // Do an ugly little dance to copy local_id across thread barrier
+        let mut id_buf = [0; 32];
+        let local_id = match local_id {
+            None => None,
+            Some(val) => {
+                id_buf.copy_from_slice(val);
+                Some(id_buf)
+            },
+        };
         thread::spawn(move || {
 
-            let dc = match DatConnection::connect(addr, &feed_key, is_live) {
+            let local_id = match local_id {
+                None => None,
+                Some(val) => {
+                    Some(&id_buf[..])
+                },
+            };
+            let dc = match DatConnection::connect(addr, &feed_key, is_live, local_id) {
                 Ok(c) => c,
                 Err(e) => {
                     // TODO: error chain!
diff --git a/src/protocol.rs b/src/protocol.rs
index 84a5793..a3ecda8 100644
--- a/src/protocol.rs
+++ b/src/protocol.rs
@@ -195,23 +195,33 @@ impl Clone for DatConnection {
 }
 
 impl DatConnection {
-    pub fn connect<A: ToSocketAddrs + Display>(addr: A, key: &Key, live: bool) -> Result<DatConnection> {
+    pub fn connect<A: ToSocketAddrs + Display>(addr: A, key: &Key, live: bool, local_id: Option<&[u8]>) -> Result<DatConnection> {
 
         // Connect to server
         info!("Connecting to {}", addr);
         // TODO: timeout on connect (socketaddr iterator dance)
         let tcp = TcpStream::connect(addr)?;
 
-        DatConnection::from_tcp(tcp, key, live)
+        DatConnection::from_tcp(tcp, key, live, local_id)
     }
 
     // It's sort of a hack, but this should be usable from an accept() as well as a connect()
-    pub fn from_tcp(tcp: TcpStream, key: &Key, live: bool) -> Result<DatConnection> {
+    pub fn from_tcp(tcp: TcpStream, key: &Key, live: bool, local_id: Option<&[u8]>) -> Result<DatConnection> {
 
         let tx_nonce = gen_nonce();
-        let mut local_id = [0; 32];
         let mut rng = OsRng::new()?;
-        rng.fill_bytes(&mut local_id);
+        let mut local_id = match local_id {
+            Some(val) => {
+                let mut buf = [0; 32];
+                buf.copy_from_slice(val);
+                buf
+            },
+            None => {
+                let mut buf = [0; 32];
+                rng.fill_bytes(&mut buf);
+                buf
+            },
+        };
 
         let mut dk = [0; 32];
         dk.copy_from_slice(&make_discovery_key(&key[0..32])[0..32]);
-- 
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