From 72f65d94b5eb95ef4fc1632adea1cfe4022281dd Mon Sep 17 00:00:00 2001
From: Bryan Newbold <bnewbold@robocracy.org>
Date: Mon, 22 Jan 2018 02:31:00 -0800
Subject: WIP on synchronizer state machine

---
 src/lib.rs          |   1 +
 src/peer.rs         |   8 ++--
 src/synchronizer.rs | 118 +++++++++++++++++++++++++++++++++++++++++++++++-----
 3 files changed, 113 insertions(+), 14 deletions(-)

diff --git a/src/lib.rs b/src/lib.rs
index 8a4825b..5370743 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -28,6 +28,7 @@ extern crate resolve;
 extern crate data_encoding;
 #[macro_use]
 extern crate chan;
+extern crate bit_vec;
 
 #[cfg(test)]
 extern crate tempdir;
diff --git a/src/peer.rs b/src/peer.rs
index c6f8c6d..0f04a40 100644
--- a/src/peer.rs
+++ b/src/peer.rs
@@ -13,15 +13,15 @@ use chan;
 /// Wraps a low-level DatConnection in a thread (or two). Contains very little context about
 /// itself.
 pub struct DatPeerThread {
-    handle: u64,
+    pub handle: u64,
     feeds: Vec<(u8, Key)>,
     outbound_chan: chan::Sender<(DatNetMessage, u8)>,
 }
 
 pub struct PeerMsg {
-    peer_handle: u64,
-    feed_index: u8,
-    msg: DatNetMessage,
+    pub peer_handle: u64,
+    pub feed_index: u8,
+    pub msg: DatNetMessage,
 }
 
 /// This is what the "receive" loop does: simply blocking reads on the TCP socket, passing any
diff --git a/src/synchronizer.rs b/src/synchronizer.rs
index 4e664f5..3cfe57d 100644
--- a/src/synchronizer.rs
+++ b/src/synchronizer.rs
@@ -2,10 +2,17 @@
 use errors::*;
 use network_msgs::*;
 use bitfield::*;
+use std::collections::HashMap;
+use std::path::{Path, PathBuf};
 use protocol::{DatNetMessage, DatConnection};
+use rand::{OsRng, Rng};
 use sleep_register::HyperRegister;
-use peer::DatPeer;
+use peer::{DatPeerThread, PeerMsg};
 use sleep_register::SleepDirRegister;
+use sodiumoxide::crypto::stream::Key;
+use bit_vec::BitVec;
+use discovery::discover_peers_dns;
+use chan;
 
 pub enum SyncMode {
     RxMax,
@@ -14,22 +21,112 @@ pub enum SyncMode {
     RxTxEndless,
 }
 
+pub struct RegisterStatus {
+    id: u8,
+    register: SleepDirRegister,
+    inflight: Vec<u64>,
+    wanted: BitVec,
+    key: Key,
+}
+
 pub struct Synchronizer {
-    peers: Vec<DatPeer>,
-    registers: Vec<SleepDirRegister>,
+    peers: HashMap<u64, DatPeerThread>,
+    registers: Vec<RegisterStatus>,
     mode: SyncMode,
-    wanted: Bitfield,
-    inflight: Vec<Vec<u64>>,
+    local_id: [u8; 32],
+    dir: Option<PathBuf>,
+    unified_peers_tx: chan::Sender<Result<PeerMsg>>,
+    unified_peers_rx: chan::Receiver<Result<PeerMsg>>,
 }
 
 impl Synchronizer {
 
-    pub fn next_wanted(&mut self, reg: u64) -> Option<(u64, u64)> {
-        // XXX
-        None
+    pub fn new_downloader(key: Key, mode: SyncMode, dir: &Path) -> Result<Synchronizer> {
+
+        let mut metadata_reg = SleepDirRegister::create(dir.as_ref(), "metadata")?;
+
+        let (unified_peers_tx, unified_peers_rx) = chan::async();
+
+        let metadata_status = RegisterStatus {
+            id: 0,
+            register: metadata_reg,
+            inflight: vec![],
+            wanted: BitVec::new(),
+            key,
+        };
+
+        let mut rng = OsRng::new()?;
+        let mut local_id = [0; 32];
+        rng.fill_bytes(&mut local_id);
+
+        let s = Synchronizer {
+            peers: HashMap::new(),
+            mode,
+            local_id,
+            dir: Some(dir.to_path_buf()),
+            registers: vec![metadata_status],
+            unified_peers_tx,
+            unified_peers_rx,
+        };
+        Ok(s)
+    }
+
+    pub fn run(&mut self) -> Result<()> {
+
+        let meta_key = &self.registers[0].key;
+        let peers = discover_peers_dns(&meta_key[0..32])?;
+        let mut rng = OsRng::new()?;
+        for p in peers {
+            let handle = rng.gen::<u64>();
+            let pt = DatPeerThread::connect(p, meta_key.clone(), handle, false, Some(&self.local_id), self.unified_peers_tx.clone())?;
+            self.peers.insert(handle, pt);
+            // TODO: send a large want? or wait for haves?
+        };
+
+        // bug in chan_select!() breaking `self` reference?
+        let unified_peers_rx = self.unified_peers_rx.clone();
+
+        loop {
+            chan_select! {
+                unified_peers_rx.recv() -> val => { },
+            };
+        }
     }
 
-    pub fn tick(&mut self) -> Result<()> {
+                /*
+                match val {
+                    Some(Ok(pm)) => {
+                        self.handle_msg(&pm);
+                    },
+                    Some(Err(e)) => {
+                        // TODO: don't bail here
+                        bail!("Got a client error: {}", e);
+                    },
+                    _ => { unimplemented!() },
+                };
+                */
+
+    fn handle_msg(&mut self, pm: &PeerMsg) -> Result<()> {
+
+        match &pm.msg {
+            &DatNetMessage::Feed(_) => { unimplemented!() },
+            &DatNetMessage::Handshake(_) => { unimplemented!() },
+            &DatNetMessage::Info(_) => { unimplemented!() },
+            &DatNetMessage::Have(ref have) => {
+                // TODO: bulk-add haves to peer status
+            },
+            &DatNetMessage::Unhave(_) => {}, // PASS
+            &DatNetMessage::Want(_) => {}, // PASS
+            &DatNetMessage::Unwant(_) => {}, // PASS
+            &DatNetMessage::Request(_) => {}, // PASS
+            &DatNetMessage::Cancel(_) => {}, // PASS
+            &DatNetMessage::Data(_) => {
+                if pm.feed_index as usize >= self.registers.len() {
+                    // TODO: invalid feed! drop connection
+                }
+                // TODO: insert into feed
+            },
+        }
         Ok(())
     }
 }
@@ -72,7 +169,8 @@ pub fn node_simple_clone(host_port: &str, key: &[u8], register: &mut HyperRegist
         bail!("Register already had data in it (expected empty for naive clone)");
     }
 
-    let mut dc = DatConnection::connect(host_port, key, false)?;
+    let key = Key::from_slice(key).unwrap();
+    let mut dc = DatConnection::connect(host_port, &key, false, None)?;
 
     // Info: downloading, not uploading
     let mut im = Info::new();
-- 
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