fix fd leakage

2 files changed, 62 insertions, 23 deletions

diff --git a/include/salticidae/network.h b/include/salticidae/network.h
index d3f3bae..e28e3df 100644
--- a/include/salticidae/network.h
+++ b/include/salticidae/network.h
@@ -275,7 +275,6 @@ class PeerNetwork: public MsgNetwork<OpcodeType> {
         friend PeerNetwork;
         Peer *peer;
         TimerEvent ev_timeout;
-        TimerEvent ev_retry_timer;
 
         void reset_timeout(double timeout);
 
@@ -320,7 +319,9 @@ class PeerNetwork: public MsgNetwork<OpcodeType> {
         double ping_period;
 
         Peer() = delete;
-        Peer(const uint256_t &peer_id, conn_t conn, conn_t inbound_conn, conn_t outbound_conn, const PeerNetwork *pn):
+        Peer(const uint256_t &peer_id,
+            conn_t conn, conn_t inbound_conn, conn_t outbound_conn,
+            const PeerNetwork *pn):
                 peer_id(peer_id),
                 conn(conn),
                 inbound_conn(inbound_conn),
@@ -346,7 +347,7 @@ class PeerNetwork: public MsgNetwork<OpcodeType> {
     };
 
     std::unordered_map<NetAddr, conn_t> pending_peers;
-    std::unordered_map<NetAddr, uint256_t> known_peers;
+    std::unordered_map<NetAddr, std::pair<uint256_t, TimerEvent>> known_peers;
     std::unordered_map<uint256_t, BoxObj<Peer>> pid2peer;
     peer_callback_t peer_cb;
     unknown_peer_callback_t unknown_peer_cb;
@@ -389,6 +390,7 @@ class PeerNetwork: public MsgNetwork<OpcodeType> {
     void _ping_msg_cb(const conn_t &conn, uint16_t port);
     void _pong_msg_cb(const conn_t &conn, uint16_t port);
     bool check_handshake(Peer *peer);
+    void replace_conn(const conn_t &conn);
     void start_active_conn(const NetAddr &addr);
     static void tcall_reset_timeout(ConnPool::Worker *worker,
                                     const conn_t &conn, double timeout);
@@ -474,6 +476,7 @@ class PeerNetwork: public MsgNetwork<OpcodeType> {
     void add_peer(const NetAddr &addr);
     void del_peer(const NetAddr &addr);
     bool has_peer(const NetAddr &addr) const;
+    size_t get_npending() const;
     conn_t get_peer_conn(const NetAddr &addr) const;
     using MsgNet::send_msg;
     template<typename MsgType>
@@ -502,7 +505,7 @@ void MsgNetwork<OpcodeType>::on_read(const ConnPool::conn_t &_conn) {
     auto &recv_buffer = conn->recv_buffer;
     auto &msg = conn->msg;
     auto &msg_state = conn->msg_state;
-    while (true) //(!conn->is_terminated())
+    while (true)
     {
         if (msg_state == Conn::HEADER)
         {
@@ -586,19 +589,18 @@ void PeerNetwork<O, _, __>::on_setup(const ConnPool::conn_t &_conn) {
     auto conn = static_pointer_cast<Conn>(_conn);
     auto worker = conn->worker;
     auto &ev_timeout = conn->ev_timeout;
-    conn->ev_retry_timer.del();
     assert(!ev_timeout);
     ev_timeout = TimerEvent(worker->get_ec(), [listen_addr=this->listen_addr, worker, conn](TimerEvent &) {
         try {
             SALTICIDAE_LOG_INFO("peer ping-pong timeout %s <-> %s",
                 std::string(listen_addr).c_str(),
                 std::string(conn->get_peer_addr()).c_str());
-            //conn->get_net()->worker_terminate(conn);
+            conn->get_net()->worker_terminate(conn);
         } catch (...) { worker->error_callback(std::current_exception()); }
     });
     /* the initial ping-pong to set up the connection */
     tcall_reset_timeout(worker, conn, conn_timeout);
-    pending_peers[conn->get_addr()] = conn;
+    replace_conn(conn);
     if (conn->get_mode() == Conn::ConnMode::ACTIVE)
         send_msg(MsgPing(listen_addr, my_nonce), conn);
 }
@@ -608,7 +610,6 @@ void PeerNetwork<O, _, __>::on_teardown(const ConnPool::conn_t &_conn) {
     MsgNet::on_teardown(_conn);
     auto conn = static_pointer_cast<Conn>(_conn);
     auto addr = conn->get_addr();
-    conn->ev_retry_timer.clear();
     conn->ev_timeout.clear();
     pending_peers.erase(addr);
     SALTICIDAE_LOG_INFO("connection lost: %s", std::string(*conn).c_str());
@@ -621,7 +622,6 @@ void PeerNetwork<O, _, __>::on_teardown(const ConnPool::conn_t &_conn) {
     });
     auto it = known_peers.find(addr);
     if (it == known_peers.end()) return;
-    pending_peers[addr] = conn;
     if (p)
     {
         if (conn != p->conn) return;
@@ -631,20 +631,19 @@ void PeerNetwork<O, _, __>::on_teardown(const ConnPool::conn_t &_conn) {
         p->connected = false;
         p->outbound_handshake = false;
         p->inbound_handshake = false;
-        known_peers[p->peer_addr] = uint256_t();
+        known_peers[p->peer_addr] = std::make_pair(uint256_t(), TimerEvent());
         pid2peer.erase(p->peer_id);
         this->user_tcall->async_call([this, conn](ThreadCall::Handle &) {
             if (peer_cb) peer_cb(conn, false);
         });
-        conn->ev_retry_timer = std::move(retry_timer);
-        conn->ev_retry_timer.add(gen_conn_timeout());
     }
     else
     {
-        if (!it->second.is_null()) return;
-        conn->ev_retry_timer = std::move(retry_timer);
-        conn->ev_retry_timer.add(gen_conn_timeout());
+        if (!it->second.first.is_null()) return;
     }
+    auto &ev_retry_timer = it->second.second;
+    ev_retry_timer = std::move(retry_timer);
+    ev_retry_timer.add(gen_conn_timeout());
 }
 
 template<typename O, O _, O __>
@@ -687,7 +686,8 @@ bool PeerNetwork<O, _, __>::check_handshake(Peer *p) {
     p->connected = true;
     p->reset_ping_timer();
     p->send_ping();
-    known_peers[p->peer_addr] = p->peer_id;
+    known_peers[p->peer_addr] = std::make_pair(p->peer_id, TimerEvent());
+    pending_peers.erase(p->conn->get_addr());
     if (p->connected)
     {
         auto color_begin = "";
@@ -711,9 +711,26 @@ bool PeerNetwork<O, _, __>::check_handshake(Peer *p) {
 }
 
 template<typename O, O _, O __>
+void PeerNetwork<O, _, __>::replace_conn(const conn_t &conn) {
+    const auto &addr = conn->get_addr();
+    auto it = pending_peers.find(addr);
+    if (it != pending_peers.end())
+    {
+        auto &old_conn = it->second;
+        if (old_conn != conn)
+        {
+            if (old_conn->get_mode() != Conn::ConnMode::DEAD)
+                this->disp_terminate(old_conn);
+            pending_peers.erase(it);
+        }
+    }
+    pending_peers.insert(std::make_pair(addr, conn));
+}
+
+template<typename O, O _, O __>
 void PeerNetwork<O, _, __>::start_active_conn(const NetAddr &addr) {
     auto conn = static_pointer_cast<Conn>(MsgNet::_connect(addr));
-    pending_peers[addr] = conn;
+    replace_conn(conn);
 }
 
 template<typename O, O _, O __>
@@ -721,7 +738,10 @@ inline typename PeerNetwork<O, _, __>::conn_t PeerNetwork<O, _, __>::_get_peer_c
     auto it = known_peers.find(addr);
     if (it == known_peers.end())
         throw PeerNetworkError(SALTI_ERROR_PEER_NOT_EXIST);
-    auto it2 = pid2peer.find(it->second);
+    auto &peer_id = it->second.first;
+    if (peer_id.is_null())
+        throw PeerNetworkError(SALTI_ERROR_PEER_NOT_READY);
+    auto it2 = pid2peer.find(peer_id);
     assert(it2 != pid2peer.end());
     return it2->second->conn;
 }
@@ -849,7 +869,16 @@ void PeerNetwork<O, _, __>::pong_handler(MsgPong &&msg, const conn_t &conn) {
                     }
                     auto p = it->second.get();
                     p->outbound_handshake = true;
-                    p->peer_addr = conn->get_addr();
+                    auto &peer_addr = conn->get_addr();
+                    auto &old_peer_addr = p->peer_addr;
+                    if (!old_peer_addr.is_null() && old_peer_addr != peer_addr)
+                    {
+                        SALTICIDAE_LOG_WARN("multiple peer addresses share the same identity");
+                        known_peers.erase(old_peer_addr);
+                        if (p->conn && p->conn->get_mode() != Conn::ConnMode::DEAD)
+                            this->disp_terminate(p->conn);
+                    }
+                    old_peer_addr = peer_addr;
                     p->reset_ping_timer();
                     check_handshake(p);
                 }
@@ -900,7 +929,8 @@ template<typename O, O _, O __>
 void PeerNetwork<O, _, __>::add_peer(const NetAddr &addr) {
     this->disp_tcall->async_call([this, addr](ThreadCall::Handle &) {
         try {
-            if (!known_peers.insert(std::make_pair(addr, uint256_t())).second)
+            if (!known_peers.insert(std::make_pair(addr,
+                    std::make_pair(uint256_t(), TimerEvent()))).second)
                 throw PeerNetworkError(SALTI_ERROR_PEER_ALREADY_EXISTS);
             if (!pending_peers.count(addr))
                 start_active_conn(addr);
@@ -917,7 +947,7 @@ void PeerNetwork<O, _, __>::del_peer(const NetAddr &addr) {
             auto it = known_peers.find(addr);
             if (it == known_peers.end())
                 throw PeerNetworkError(SALTI_ERROR_PEER_NOT_EXIST);
-            auto peer_id = it->second;
+            auto peer_id = it->second.first;
             known_peers.erase(it);
             auto it2 = pending_peers.find(addr);
             if (it2 != pending_peers.end())
@@ -950,12 +980,12 @@ PeerNetwork<O, _, __>::get_peer_conn(const NetAddr &addr) const {
             auto it = known_peers.find(addr);
             if (it == known_peers.end())
                 throw PeerNetworkError(SALTI_ERROR_PEER_NOT_EXIST);
-            if (it->second.is_null())
+            if (it->second.first.is_null())
             {
                 conn = nullptr;
                 return;
             }
-            auto it2 = pid2peer.find(it->second);
+            auto it2 = pid2peer.find(it->second.first);
             assert(it2 != pid2peer.end());
             conn = it2->second->conn;
         } catch (const PeerNetworkError &) {
@@ -978,6 +1008,14 @@ bool PeerNetwork<O, _, __>::has_peer(const NetAddr &addr) const {
 }
 
 template<typename O, O _, O __>
+size_t PeerNetwork<O, _, __>::get_npending() const {
+    return *(static_cast<bool *>(this->disp_tcall->call(
+                [this](ThreadCall::Handle &h) {
+        h.set_result(pending_peers.size());
+    }).get()));
+}
+
+template<typename O, O _, O __>
 template<typename MsgType>
 inline void PeerNetwork<O, _, __>::send_msg_deferred(MsgType &&msg, const NetAddr &addr) {
     return _send_msg_deferred(std::move(msg), addr);
diff --git a/include/salticidae/util.h b/include/salticidae/util.h
index 5059f13..063058c 100644
--- a/include/salticidae/util.h
+++ b/include/salticidae/util.h
@@ -85,6 +85,7 @@ enum SalticidaeErrorCode {
     SALTI_ERROR_CONNECT,
     SALTI_ERROR_PEER_ALREADY_EXISTS,
     SALTI_ERROR_PEER_NOT_EXIST,
+    SALTI_ERROR_PEER_NOT_READY,
     SALTI_ERROR_NETADDR_INVALID,
     SALTI_ERROR_OPTVAL_INVALID,
     SALTI_ERROR_OPTNAME_ALREADY_EXISTS,