Add metadata to received messages

src/Makefile.am

@@ -46,6 +46,7 @@ libzmq_la_SOURCES = \
     likely.hpp \
     mailbox.hpp \
     mechanism.hpp  \
+    metadata.hpp \
     msg.hpp \
     mtrie.hpp \
     mutex.hpp \
@@ -118,6 +119,7 @@ libzmq_la_SOURCES = \
     lb.cpp \
     mailbox.cpp \
     mechanism.cpp \
+    metadata.cpp \
     msg.cpp \
     mtrie.cpp \
     norm_engine.cpp \

src/curve_server.cpp

@@ -663,7 +663,7 @@ int zmq::curve_server_t::receive_and_process_zap_reply ()
 
     //  Process metadata frame
     rc = parse_metadata (static_cast <const unsigned char*> (msg [6].data ()),
-                         msg [6].size ());
+                         msg [6].size (), true);
 
 error:
     for (int i = 0; i < 7; i++) {

src/gssapi_server.cpp

@@ -268,7 +268,7 @@ int zmq::gssapi_server_t::receive_and_process_zap_reply ()
 
     //  Process metadata frame
     rc = parse_metadata (static_cast <const unsigned char*> (msg [6].data ()),
-                         msg [6].size ());
+                         msg [6].size (), true);
 
 error:
     for (int i = 0; i < 7; i++) {

src/i_properties.hpp

@@ -20,6 +20,8 @@
 #ifndef __ZMQ_I_PROPERTIES_HPP_INCLUDED__
 #define __ZMQ_I_PROPERTIES_HPP_INCLUDED__
 
+#include <string>
+
 namespace zmq
 {
     //  Interface for accessing message properties.
@@ -32,7 +34,7 @@ namespace zmq
 
         //  Returns pointer to property value or NULL if
         //  property not found.
-        virtual const char *get (const char *property) const = 0;
+        virtual const char *get (const std::string &property) const = 0;
 
         virtual void add_ref () = 0;
 

src/mechanism.cpp

@@ -18,6 +18,7 @@
 */
 
 #include <string.h>
+#include <map>
 
 #include "mechanism.hpp"
 #include "options.hpp"
@@ -26,12 +27,16 @@
 #include "wire.hpp"
 
 zmq::mechanism_t::mechanism_t (const options_t &options_) :
+    metadata (NULL),
     options (options_)
 {
 }
 
 zmq::mechanism_t::~mechanism_t ()
 {
+    if (metadata != NULL)
+        if (metadata->drop_ref ())
+            delete metadata;
 }
 
 void zmq::mechanism_t::set_peer_identity (const void *id_ptr, size_t id_size)
@@ -83,8 +88,9 @@ size_t zmq::mechanism_t::add_property (unsigned char *ptr, const char *name,
 }
 
 int zmq::mechanism_t::parse_metadata (const unsigned char *ptr_,
-                                      size_t length_)
+                                      size_t length_, bool zap_flag)
 {
+    std::map <const std::string, const std::string> dict;
     size_t bytes_left = length_;
 
     while (bytes_left > 1) {
@@ -125,11 +131,19 @@ int zmq::mechanism_t::parse_metadata (const unsigned char *ptr_,
             if (rc == -1)
                 return -1;
         }
+
+        dict.insert (
+            std::map <const std::string, const std::string>::value_type (
+                name, std::string ((char *) value, value_length)));
     }
     if (bytes_left > 0) {
         errno = EPROTO;
         return -1;
     }
+    if (zap_flag) {
+        assert (metadata == NULL);
+        metadata = new (std::nothrow) metadata_t (dict);
+    }
     return 0;
 }
 

src/mechanism.hpp

@@ -23,6 +23,7 @@
 #include "stdint.hpp"
 #include "options.hpp"
 #include "blob.hpp"
+#include "metadata.hpp"
 
 namespace zmq
 {
@@ -64,6 +65,8 @@ namespace zmq
 
         blob_t get_user_id () const;
 
+        metadata_t *get_metadata () { return metadata; }
+
     protected:
 
         //  Only used to identify the socket for the Socket-Type
@@ -77,7 +80,8 @@ namespace zmq
         //  Metadata consists of a list of properties consisting of
         //  name and value as size-specified strings.
         //  Returns 0 on success and -1 on error, in which case errno is set.
-        int parse_metadata (const unsigned char *ptr_, size_t length);
+        int parse_metadata (
+            const unsigned char *ptr_, size_t length, bool zap_flag = false);
 
         //  This is called by parse_property method whenever it
         //  parses a new property. The function should return 0
@@ -89,6 +93,10 @@ namespace zmq
         virtual int property (const std::string& name_,
                               const void *value_, size_t length_);
 
+        //  Metadada as returned by ZAP protocol.
+        //  NULL if no metadata received.
+        metadata_t *metadata;
+
         options_t options;
 
     private:

src/metadata.cpp

@@ -0,0 +1,49 @@
+/*
+    Copyright (c) 2007-2014 Contributors as noted in the AUTHORS file
+
+    This file is part of 0MQ.
+
+    0MQ is free software; you can redistribute it and/or modify it under
+    the terms of the GNU Lesser General Public License as published by
+    the Free Software Foundation; either version 3 of the License, or
+    (at your option) any later version.
+
+    0MQ is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU Lesser General Public License for more details.
+
+    You should have received a copy of the GNU Lesser General Public License
+    along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#include "metadata.hpp"
+
+zmq::metadata_t::metadata_t (dict_t &dict) :
+    ref_cnt (1),
+    dict (dict)
+{
+}
+
+zmq::metadata_t::~metadata_t ()
+{
+}
+
+const char *zmq::metadata_t::get (const std::string &property) const
+{
+    dict_t::const_iterator it = dict.find (property);
+    if (it == dict.end ())
+        return NULL;
+    else
+        return it->second.c_str ();
+}
+
+void zmq::metadata_t::add_ref ()
+{
+    ref_cnt.add (1);
+}
+
+bool zmq::metadata_t::drop_ref ()
+{
+    return !ref_cnt.sub (1);
+}

src/metadata.hpp

@@ -0,0 +1,59 @@
+/*
+    Copyright (c) 2007-2014 Contributors as noted in the AUTHORS file
+
+    This file is part of 0MQ.
+
+    0MQ is free software; you can redistribute it and/or modify it under
+    the terms of the GNU Lesser General Public License as published by
+    the Free Software Foundation; either version 3 of the License, or
+    (at your option) any later version.
+
+    0MQ is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU Lesser General Public License for more details.
+
+    You should have received a copy of the GNU Lesser General Public License
+    along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#ifndef __ZMQ_METADATA_HPP_INCLUDED__
+#define __ZMQ_METADATA_HPP_INCLUDED__
+
+#include <map>
+
+#include "atomic_counter.hpp"
+#include "i_properties.hpp"
+
+namespace zmq
+{
+    class metadata_t : public i_properties
+    {
+        public:
+
+            metadata_t (std::map <const std::string, const std::string> &dict);
+            virtual ~metadata_t ();
+
+            //  Returns pointer to property value or NULL if
+            //  property is not found.
+            virtual const char *get (const std::string &property) const;
+
+            virtual void add_ref ();
+
+            //  Drop reference. Returns true iff the reference
+            //  counter drops to zero.
+            virtual bool drop_ref ();
+
+        private:
+
+            //  Reference counter.
+            atomic_counter_t ref_cnt;
+
+            //  Dictionary holding metadata.
+            typedef std::map <const std::string, const std::string> dict_t;
+            const dict_t dict;
+    };
+
+}
+
+#endif

src/null_mechanism.cpp

@@ -285,7 +285,7 @@ int zmq::null_mechanism_t::receive_and_process_zap_reply ()
 
     //  Process metadata frame
     rc = parse_metadata (static_cast <const unsigned char*> (msg [6].data ()),
-                         msg [6].size ());
+                         msg [6].size (), true);
 
 error:
     for (int i = 0; i < 7; i++) {

src/plain_mechanism.cpp

@@ -502,7 +502,7 @@ int zmq::plain_mechanism_t::receive_and_process_zap_reply ()
 
     //  Process metadata frame
     rc = parse_metadata (static_cast <const unsigned char*> (msg [6].data ()),
-                         msg [6].size ());
+                         msg [6].size (), true);
 
 error:
     for (int i = 0; i < 7; i++) {

src/stream_engine.cpp

@@ -780,6 +780,9 @@ int zmq::stream_engine_t::decode_and_push (msg_t *msg_)
 
     if (mechanism->decode (msg_) == -1)
         return -1;
+    metadata_t *metadata = mechanism->get_metadata ();
+    if (metadata)
+        msg_->set_properties (metadata);
     if (session->push_msg (msg_) == -1) {
         if (errno == EAGAIN)
             write_msg = &stream_engine_t::push_one_then_decode_and_push;

src/zmq.cpp

@@ -649,7 +649,7 @@ const char *zmq_msg_gets (zmq_msg_t *msg_, const char *property_)
 {
     zmq::i_properties *properties = ((zmq::msg_t*) msg_)->properties ();
     if (properties)
-        return properties->get (property_);
+        return properties->get (std::string (property_));
     else
         return NULL;
 }