Backport resolve #1357 Support limited metadata for STREAM sockets

src/stream.cpp

@@ -211,6 +211,12 @@ int zmq::stream_t::xrecv (msg_t *msg_)
     blob_t identity = pipe->get_identity ();
     rc = msg_->init_size (identity.size ());
     errno_assert (rc == 0);
+
+    // forward metadata (if any)
+    metadata_t *metadata = prefetched_msg.metadata();
+    if (metadata)
+        msg_->set_metadata(metadata);
+
     memcpy (msg_->data (), identity.data (), identity.size ());
     msg_->set_flags (msg_t::more);
 
@@ -267,7 +273,7 @@ void zmq::stream_t::identify_peer (pipe_t *pipe_)
             connect_rid.length ());
         connect_rid.clear ();
         outpipes_t::iterator it = outpipes.find (identity);
-        if (it != outpipes.end ()) 
+        if (it != outpipes.end ())
             zmq_assert(false);
     }
     else {

src/stream_engine.cpp

@@ -192,13 +192,22 @@ void zmq::stream_engine_t::plug (io_thread_t *io_thread_,
         handshaking = false;
 
         next_msg = &stream_engine_t::pull_msg_from_session;
-        process_msg = &stream_engine_t::push_msg_to_session;
+        process_msg = &stream_engine_t::push_raw_msg_to_session;
+
+        if (!peer_address.empty()) {
+            //  Compile metadata.
+            typedef metadata_t::dict_t properties_t;
+            properties_t properties;
+            properties.insert(std::make_pair("Peer-Address", peer_address));
+            zmq_assert (metadata == NULL);
+            metadata = new (std::nothrow) metadata_t (properties);
+        }
 
         //  For raw sockets, send an initial 0-length message to the
         // application so that it knows a peer has connected.
         msg_t connector;
         connector.init();
-        push_msg_to_session (&connector);
+        push_raw_msg_to_session (&connector);
         connector.close();
         session->flush ();
     }
@@ -822,6 +831,12 @@ int zmq::stream_engine_t::push_msg_to_session (msg_t *msg_)
     return session->push_msg (msg_);
 }
 
+int zmq::stream_engine_t::push_raw_msg_to_session (msg_t *msg_) {
+    if (metadata)
+        msg_->set_metadata(metadata);
+    return push_msg_to_session(msg_);
+}
+
 int zmq::stream_engine_t::write_credential (msg_t *msg_)
 {
     zmq_assert (mechanism != NULL);

src/stream_engine.hpp

@@ -59,7 +59,7 @@ namespace zmq
             timeout_error
         };
 
-        stream_engine_t (fd_t fd_, const options_t &options_, 
+        stream_engine_t (fd_t fd_, const options_t &options_,
                          const std::string &endpoint);
         ~stream_engine_t ();
 
@@ -96,6 +96,8 @@ namespace zmq
         int next_handshake_command (msg_t *msg);
         int process_handshake_command (msg_t *msg);
 
+        int push_raw_msg_to_session (msg_t *msg);
+
         int pull_msg_from_session (msg_t *msg_);
         int push_msg_to_session (msg_t *msg);
 

tests/test_stream.cpp

@@ -77,17 +77,23 @@ test_stream_to_dealer (void)
     assert (rc > 0);
     assert (zmq_msg_more (&identity));
 
+    // Verify the existence of Peer-Address metadata
+    assert (streq (zmq_msg_gets (&identity, "Peer-Address"), "127.0.0.1"));
+
     //  Second frame is zero
     byte buffer [255];
     rc = zmq_recv (stream, buffer, 255, 0);
     assert (rc == 0);
-    
+
     //  Real data follows
     //  First frame is identity
     rc = zmq_msg_recv (&identity, stream, 0);
     assert (rc > 0);
     assert (zmq_msg_more (&identity));
 
+    // Verify the existence of Peer-Address metadata
+    assert (streq (zmq_msg_gets (&identity, "Peer-Address"), "127.0.0.1"));
+
     //  Second frame is greeting signature
     rc = zmq_recv (stream, buffer, 255, 0);
     assert (rc == 10);
@@ -179,7 +185,7 @@ test_stream_to_stream (void)
     //  Set-up our context and sockets
     void *ctx = zmq_ctx_new ();
     assert (ctx);
-    
+
     void *server = zmq_socket (ctx, ZMQ_STREAM);
     assert (server);
     rc = zmq_bind (server, "tcp://127.0.0.1:9070");
@@ -192,7 +198,7 @@ test_stream_to_stream (void)
     uint8_t id [256];
     size_t id_size = 256;
     uint8_t buffer [256];
-    
+
     //  Connecting sends a zero message
     //  Server: First frame is identity, second frame is zero
     id_size = zmq_recv (server, id, 256, 0);
@@ -215,19 +221,19 @@ test_stream_to_stream (void)
     //  Second frame is HTTP GET request
     rc = zmq_send (client, "GET /\n\n", 7, 0);
     assert (rc == 7);
-    
+
     //  Get HTTP request; ID frame and then request
     id_size = zmq_recv (server, id, 256, 0);
     assert (id_size > 0);
     rc = zmq_recv (server, buffer, 256, 0);
     assert (rc != -1);
     assert (memcmp (buffer, "GET /\n\n", 7) == 0);
-    
+
     //  Send reply back to client
     char http_response [] =
-        "HTTP/1.0 200 OK\r\n" 
-        "Content-Type: text/plain\r\n" 
-        "\r\n" 
+        "HTTP/1.0 200 OK\r\n"
+        "Content-Type: text/plain\r\n"
+        "\r\n"
         "Hello, World!";
     rc = zmq_send (server, id, id_size, ZMQ_SNDMORE);
     assert (rc != -1);