Simplify ZMQ_STREAM socket implementation

src/stream.cpp

@@ -34,7 +34,6 @@ zmq::stream_t::stream_t (class ctx_t *parent_, uint32_t tid_, int sid_) :
     next_peer_id (generate_random ())
 {
     options.type = ZMQ_STREAM;
-    options.recv_identity = true;
     options.raw_sock = true;
 
     prefetched_id.init ();
@@ -43,7 +42,6 @@ zmq::stream_t::stream_t (class ctx_t *parent_, uint32_t tid_, int sid_) :
 
 zmq::stream_t::~stream_t ()
 {
-    zmq_assert (anonymous_pipes.empty ());;
     zmq_assert (outpipes.empty ());
     prefetched_id.close ();
     prefetched_msg.close ();
@@ -56,40 +54,23 @@ void zmq::stream_t::xattach_pipe (pipe_t *pipe_, bool icanhasall_)
 
     zmq_assert (pipe_);
 
-    bool identity_ok = identify_peer (pipe_);
-    if (identity_ok)
-        fq.attach (pipe_);
-    else
-        anonymous_pipes.insert (pipe_);
+    identify_peer (pipe_);
+    fq.attach (pipe_);
 }
 
 void zmq::stream_t::xpipe_terminated (pipe_t *pipe_)
 {
-    std::set <pipe_t*>::iterator it = anonymous_pipes.find (pipe_);
-    if (it != anonymous_pipes.end ())
-        anonymous_pipes.erase (it);
-    else {
-        outpipes_t::iterator it = outpipes.find (pipe_->get_identity ());
-        zmq_assert (it != outpipes.end ());
-        outpipes.erase (it);
-        fq.pipe_terminated (pipe_);
-        if (pipe_ == current_out)
-            current_out = NULL;
-    }
+    outpipes_t::iterator it = outpipes.find (pipe_->get_identity ());
+    zmq_assert (it != outpipes.end ());
+    outpipes.erase (it);
+    fq.pipe_terminated (pipe_);
+    if (pipe_ == current_out)
+        current_out = NULL;
 }
 
 void zmq::stream_t::xread_activated (pipe_t *pipe_)
 {
-    std::set <pipe_t*>::iterator it = anonymous_pipes.find (pipe_);
-    if (it == anonymous_pipes.end ())
-        fq.activated (pipe_);
-    else {
-        bool identity_ok = identify_peer (pipe_);
-        if (identity_ok) {
-            anonymous_pipes.erase (it);
-            fq.attach (pipe_);
-        }
-    }
+    fq.activated (pipe_);
 }
 
 void zmq::stream_t::xwrite_activated (pipe_t *pipe_)
@@ -147,7 +128,7 @@ int zmq::stream_t::xsend (msg_t *msg_)
         return 0;
     }
 
-    //  Ignore the MORE flag 
+    //  Ignore the MORE flag
     msg_->reset_flags (msg_t::more);
 
     //  Check whether this is the last part of the message.
@@ -159,7 +140,7 @@ int zmq::stream_t::xsend (msg_t *msg_)
         // Close the remote connection if user has asked to do so
         // by sending zero length message.
         // Pending messages in the pipe will be dropped (on receiving term- ack)
-        if (msg_->size() == 0) {
+        if (msg_->size () == 0) {
             current_out->terminate (false);
             int rc = msg_->close ();
             errno_assert (rc == 0);
@@ -206,14 +187,6 @@ int zmq::stream_t::xrecv (msg_t *msg_)
 
     pipe_t *pipe = NULL;
     int rc = fq.recvpipe (msg_, &pipe);
-
-    //  It's possible that we receive peer's identity. That happens
-    //  after reconnection. The current implementation assumes that
-    //  the peer always uses the same identity.
-    //  TODO: handle the situation when the peer changes its identity.
-    while (rc == 0 && msg_->is_identity ())
-        rc = fq.recvpipe (msg_, &pipe);
-
     if (rc != 0)
         return -1;
 
@@ -241,16 +214,6 @@ int zmq::stream_t::xrecv (msg_t *msg_)
     return 0;
 }
 
-int zmq::stream_t::rollback (void)
-{
-    if (current_out) {
-        current_out->rollback ();
-        current_out = NULL;
-        more_out = false;
-    }
-    return 0;
-}
-
 bool zmq::stream_t::xhas_in ()
 {
     //  If we are in the middle of reading the messages, there are
@@ -266,13 +229,6 @@ bool zmq::stream_t::xhas_in ()
     //  The message, if read, is kept in the pre-fetch buffer.
     pipe_t *pipe = NULL;
     int rc = fq.recvpipe (&prefetched_msg, &pipe);
-
-    //  It's possible that we receive peer's identity. That happens
-    //  after reconnection. The current implementation assumes that
-    //  the peer always uses the same identity.
-    while (rc == 0 && prefetched_msg.is_identity ())
-        rc = fq.recvpipe (&prefetched_msg, &pipe);
-
     if (rc != 0)
         return false;
 
@@ -292,34 +248,29 @@ bool zmq::stream_t::xhas_in ()
 
 bool zmq::stream_t::xhas_out ()
 {
-    //  In theory, ROUTER socket is always ready for writing. Whether actual
+    //  In theory, STREAM socket is always ready for writing. Whether actual
     //  attempt to write succeeds depends on which pipe the message is going
     //  to be routed to.
     return true;
 }
 
-bool zmq::stream_t::identify_peer (pipe_t *pipe_)
+void zmq::stream_t::identify_peer (pipe_t *pipe_)
 {
-    blob_t identity;
-    bool ok;
-
     //  Always assign identity for raw-socket
     unsigned char buffer [5];
     buffer [0] = 0;
     put_uint32 (buffer + 1, next_peer_id++);
-    identity = blob_t (buffer, sizeof buffer);
-    unsigned int i = 0;  // Store identity to allow use of raw socket as client
-    for (blob_t::iterator it = identity.begin(); it != identity.end(); it++)
-        options.identity[i++] = *it;
-    options.identity_size = i;
+    blob_t identity = blob_t (buffer, sizeof buffer);
+
+    memcpy (options.identity, identity.data (), identity.size ());
+    options.identity_size = identity.size ();
 
     pipe_->set_identity (identity);
     //  Add the record into output pipes lookup table
     outpipe_t outpipe = {pipe_, true};
-    ok = outpipes.insert (outpipes_t::value_type (identity, outpipe)).second;
+    const bool ok = outpipes.insert (
+        outpipes_t::value_type (identity, outpipe)).second;
     zmq_assert (ok);
-
-    return true;
 }
 
 zmq::stream_session_t::stream_session_t (io_thread_t *io_thread_, bool connect_,

src/stream.hpp

@@ -30,7 +30,7 @@ namespace zmq
     class ctx_t;
     class pipe_t;
 
-    class stream_t : 
+    class stream_t :
         public socket_base_t
     {
     public:
@@ -48,14 +48,9 @@ namespace zmq
         void xwrite_activated (zmq::pipe_t *pipe_);
         void xpipe_terminated (zmq::pipe_t *pipe_);
 
-    protected:
-
-        //  Rollback any message parts that were sent but not yet flushed.
-        int rollback ();
-
     private:
-        //  Receive peer id and update lookup map
-        bool identify_peer (pipe_t *pipe_);
+        //  Generate peer's id and update lookup map
+        void identify_peer (pipe_t *pipe_);
 
         //  Fair queueing object for inbound pipes.
         fq_t fq;
@@ -82,9 +77,6 @@ namespace zmq
             bool active;
         };
 
-        //  We keep a set of pipes that have not been identified yet.
-        std::set <pipe_t*> anonymous_pipes;
-
         //  Outbound pipes indexed by the peer IDs.
         typedef std::map <blob_t, outpipe_t> outpipes_t;
         outpipes_t outpipes;
@@ -99,10 +91,6 @@ namespace zmq
         //  algorithm. This value is the next ID to use (if not used already).
         uint32_t next_peer_id;
 
-        // If true, report EAGAIN to the caller instead of silently dropping 
-        // the message targeting an unknown peer.
-        bool mandatory;
-
         stream_t (const stream_t&);
         const stream_t &operator = (const stream_t&);
     };