From a4843b65d24f9caa188bb2454b28080f0cee8484 Mon Sep 17 00:00:00 2001
From: Martin Sustrik <sustrik@250bpm.com>
Date: Fri, 4 Nov 2011 08:00:47 +0100
Subject: Identities re-introduced

However, the "durable socket" behaviour wasn't re-added.
Identities are used solely for routing in REQ/REP pattern.

Signed-off-by: Martin Sustrik <sustrik@250bpm.com>
---
 src/xrep.cpp | 102 ++++++++++++++++++++++++++++++++++++-----------------------
 1 file changed, 63 insertions(+), 39 deletions(-)

(limited to 'src/xrep.cpp')

diff --git a/src/xrep.cpp b/src/xrep.cpp
index 350d752..ea19e56 100644
--- a/src/xrep.cpp
+++ b/src/xrep.cpp
@@ -43,6 +43,9 @@ zmq::xrep_t::xrep_t (class ctx_t *parent_, uint32_t tid_) :
     //  all the outstanding requests from that peer.
     //  options.delay_on_disconnect = false;
 
+    options.send_identity = true;
+    options.recv_identity = true;
+
     prefetched_msg.init ();
 }
 
@@ -56,33 +59,22 @@ void zmq::xrep_t::xattach_pipe (pipe_t *pipe_)
 {
     zmq_assert (pipe_);
 
-    //  Generate a new peer ID. Take care to avoid duplicates.
-    outpipes_t::iterator it = outpipes.lower_bound (next_peer_id);
-    if (!outpipes.empty ()) {
-        while (true) {
-            if (it == outpipes.end ())
-                it = outpipes.begin ();
-            if (it->first != next_peer_id)
-                break;
-            ++next_peer_id;
-            ++it;
-        }
-    }
+    //  Generate a new unique peer identity.
+    unsigned char buf [5];
+    buf [0] = 0;
+    put_uint32 (buf + 1, next_peer_id);
+    blob_t identity (buf, 5);
+    ++next_peer_id;
 
     //  Add the pipe to the map out outbound pipes.
     outpipe_t outpipe = {pipe_, true};
     bool ok = outpipes.insert (outpipes_t::value_type (
-        next_peer_id, outpipe)).second;
+        identity, outpipe)).second;
     zmq_assert (ok);
 
     //  Add the pipe to the list of inbound pipes.
-    pipe_->set_pipe_id (next_peer_id);
-    fq.attach (pipe_);
-
-    //  Advance next peer ID so that if new connection is dropped shortly after
-    //  its creation we don't accidentally get two subsequent peers with
-    //  the same ID.
-    ++next_peer_id;
+    pipe_->set_identity (identity);
+    fq.attach (pipe_);    
 }
 
 void zmq::xrep_t::xterminated (pipe_t *pipe_)
@@ -133,26 +125,25 @@ int zmq::xrep_t::xsend (msg_t *msg_, int flags_)
 
             more_out = true;
 
-            //  Find the pipe associated with the peer ID stored in the prefix.
+            //  Find the pipe associated with the identity stored in the prefix.
             //  If there's no such pipe just silently ignore the message.
-            if (msg_->size () == 4) {
-                uint32_t peer_id = get_uint32 ((unsigned char*) msg_->data ());
-                outpipes_t::iterator it = outpipes.find (peer_id);
-
-                if (it != outpipes.end ()) {
-                    current_out = it->second.pipe;
-                    msg_t empty;
-                    int rc = empty.init ();
-                    errno_assert (rc == 0);
-                    if (!current_out->check_write (&empty)) {
-                        it->second.active = false;
-                        more_out = false;
-                        current_out = NULL;
-                    }
-                    rc = empty.close ();
-                    errno_assert (rc == 0);
+            blob_t identity ((unsigned char*) msg_->data (), msg_->size ());
+            outpipes_t::iterator it = outpipes.find (identity);
+
+            if (it != outpipes.end ()) {
+                current_out = it->second.pipe;
+                msg_t empty;
+                int rc = empty.init ();
+                errno_assert (rc == 0);
+                if (!current_out->check_write (&empty)) {
+                    it->second.active = false;
+                    more_out = false;
+                    current_out = NULL;
                 }
+                rc = empty.close ();
+                errno_assert (rc == 0);
             }
+
         }
 
         int rc = msg_->close ();
@@ -204,6 +195,37 @@ int zmq::xrep_t::xrecv (msg_t *msg_, int flags_)
     if (rc != 0)
         return -1;
 
+    //  If identity is received, change the key assigned to the pipe.
+    if (unlikely (msg_->flags () & msg_t::identity)) {
+        zmq_assert (!more_in);
+
+        //  Empty identity means we can preserve the auto-generated identity.
+        if (msg_->size () != 0) {
+
+            //  Actual change of the identity.
+            outpipes_t::iterator it = outpipes.begin ();
+            while (it != outpipes.end ()) {
+                if (it->second.pipe == pipe) {
+                    blob_t identity ((unsigned char*) msg_->data (),
+                        msg_->size ());
+                    pipe->set_identity (identity);
+                    outpipes.erase (it);
+                    outpipe_t outpipe = {pipe, true};
+                    outpipes.insert (outpipes_t::value_type (identity,
+                        outpipe));
+                    break;
+                }
+                ++it;
+            }
+            zmq_assert (it != outpipes.end ());
+        }
+
+        //  After processing the identity, try to get the next message.
+        rc = fq.recvpipe (msg_, flags_, &pipe);
+        if (rc != 0)
+            return -1;
+    }
+
     //  If we are in the middle of reading a message, just return the next part.
     if (more_in) {
         more_in = msg_->flags () & msg_t::more ? true : false;
@@ -217,9 +239,11 @@ int zmq::xrep_t::xrecv (msg_t *msg_, int flags_)
     prefetched = true;
     rc = msg_->close ();
     errno_assert (rc == 0);
-    rc = msg_->init_size (4);
+
+    blob_t identity = pipe->get_identity ();
+    rc = msg_->init_size (identity.size ());
     errno_assert (rc == 0);
-    put_uint32 ((unsigned char*) msg_->data (), pipe->get_pipe_id ());
+    memcpy (msg_->data (), identity.data (), identity.size ());
     msg_->set_flags (msg_t::more);
     return 0;
 }
-- 
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