implement client socket type and drop messages when more flag is set on client and server

Makefile.am

@@ -26,6 +26,8 @@ src_libzmq_la_SOURCES = \
 	src/atomic_counter.hpp \
 	src/atomic_ptr.hpp \
 	src/blob.hpp \
+	src/client.cpp \
+	src/client.hpp \
 	src/clock.cpp \
 	src/clock.hpp \
 	src/command.hpp \
@@ -341,7 +343,7 @@ test_apps = \
 	tests/test_xpub_manual \
 	tests/test_xpub_welcome_msg \
 	tests/test_atomics \
-	tests/test_server
+	tests/test_client_server
 
 tests_test_system_SOURCES = tests/test_system.cpp
 tests_test_system_LDADD = src/libzmq.la
@@ -513,8 +515,8 @@ tests_test_xpub_welcome_msg_LDADD = src/libzmq.la
 tests_test_atomics_SOURCES = tests/test_atomics.cpp
 tests_test_atomics_LDADD = src/libzmq.la
 
-tests_test_server_SOURCES = tests/test_server.cpp
+tests_test_client_server_SOURCES = tests/test_client_server.cpp
-tests_test_server_LDADD = src/libzmq.la
+tests_test_client_server_LDADD = src/libzmq.la
 
 if !ON_MINGW
 if !ON_CYGWIN

include/zmq.h

@@ -239,6 +239,7 @@ ZMQ_EXPORT uint32_t zmq_msg_get_routing_id(zmq_msg_t *msg);
 #define ZMQ_XSUB 10
 #define ZMQ_STREAM 11
 #define ZMQ_SERVER 12
+#define ZMQ_CLIENT 13
 
 /*  Deprecated aliases                                                        */
 #define ZMQ_XREQ ZMQ_DEALER

src/client.cpp

@@ -0,0 +1,102 @@
+/*
+    Copyright (c) 2007-2015 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 "client.hpp"
+#include "err.hpp"
+#include "msg.hpp"
+
+zmq::client_t::client_t (class ctx_t *parent_, uint32_t tid_, int sid_) :
+    socket_base_t (parent_, tid_, sid_)
+{
+    options.type = ZMQ_CLIENT;
+}
+
+zmq::client_t::~client_t ()
+{
+}
+
+void zmq::client_t::xattach_pipe (pipe_t *pipe_, bool subscribe_to_all_)
+{
+    // subscribe_to_all_ is unused
+    (void) subscribe_to_all_;
+
+    zmq_assert (pipe_);    
+
+    fq.attach (pipe_);
+    lb.attach (pipe_);
+}
+
+int zmq::client_t::xsend (msg_t *msg_)
+{
+    zmq_assert(!(msg_->flags () & msg_t::more));
+
+    return lb.sendpipe (msg_, NULL);
+}
+
+int zmq::client_t::xrecv (msg_t *msg_)
+{        
+    int rc = fq.recvpipe (msg_, NULL);
+
+    // Drop any messages with more flag
+    while (rc == 0 && msg_->flags () & msg_t::more) {
+
+        // drop all frames of the current multi-frame message
+        rc = fq.recvpipe (msg_, NULL);            
+        
+        while (rc == 0 && msg_->flags () & msg_t::more)
+            rc = fq.recvpipe (msg_, NULL);            
+
+        // get the new message
+        if (rc == 0)            
+            rc = fq.recvpipe (msg_, NULL);
+    }    
+
+    return rc;
+}
+
+bool zmq::client_t::xhas_in ()
+{
+    return fq.has_in ();
+}
+
+bool zmq::client_t::xhas_out ()
+{
+    return lb.has_out ();
+}
+
+zmq::blob_t zmq::client_t::get_credential () const
+{
+    return fq.get_credential ();
+}
+
+void zmq::client_t::xread_activated (pipe_t *pipe_)
+{
+    fq.activated (pipe_);
+}
+
+void zmq::client_t::xwrite_activated (pipe_t *pipe_)
+{
+    lb.activated (pipe_);
+}
+
+void zmq::client_t::xpipe_terminated (pipe_t *pipe_)
+{
+    fq.pipe_terminated (pipe_);
+    lb.pipe_terminated (pipe_);
+}

src/client.hpp

@@ -0,0 +1,71 @@
+/*
+    Copyright (c) 2007-2015 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_CLIENT_HPP_INCLUDED__
+#define __ZMQ_CLIENT_HPP_INCLUDED__
+
+#include "socket_base.hpp"
+#include "session_base.hpp"
+#include "fq.hpp"
+#include "lb.hpp"
+
+namespace zmq
+{
+
+    class ctx_t;
+    class msg_t;
+    class pipe_t;
+    class io_thread_t;
+    class socket_base_t;
+
+    class client_t :
+        public socket_base_t
+    {
+    public:
+
+        client_t (zmq::ctx_t *parent_, uint32_t tid_, int sid);
+        ~client_t ();
+
+    protected:
+
+        //  Overrides of functions from socket_base_t.
+        void xattach_pipe (zmq::pipe_t *pipe_, bool subscribe_to_all_);        
+        int xsend (zmq::msg_t *msg_);
+        int xrecv (zmq::msg_t *msg_);
+        bool xhas_in ();
+        bool xhas_out ();
+        blob_t get_credential () const;
+        void xread_activated (zmq::pipe_t *pipe_);
+        void xwrite_activated (zmq::pipe_t *pipe_);
+        void xpipe_terminated (zmq::pipe_t *pipe_);
+        
+    private:
+
+        //  Messages are fair-queued from inbound pipes. And load-balanced to
+        //  the outbound pipes.
+        fq_t fq;
+        lb_t lb;
+        
+        client_t (const client_t &);
+        const client_t  &operator = (const client_t&);
+    };
+
+}
+
+#endif

src/mechanism.cpp

@@ -64,8 +64,8 @@ const char *zmq::mechanism_t::socket_type_string (int socket_type) const
 {
     static const char *names [] = {"PAIR", "PUB", "SUB", "REQ", "REP",
                                    "DEALER", "ROUTER", "PULL", "PUSH",
-                                   "XPUB", "XSUB", "STREAM", "SERVER"};
+                                   "XPUB", "XSUB", "STREAM", "SERVER", "CLIENT"};
-    zmq_assert (socket_type >= 0 && socket_type <= 12);
+    zmq_assert (socket_type >= 0 && socket_type <= 13);
     return names [socket_type];
 }
 
@@ -160,7 +160,7 @@ bool zmq::mechanism_t::check_socket_type (const std::string& type_) const
         case ZMQ_REP:
             return type_ == "REQ" || type_ == "DEALER";
         case ZMQ_DEALER:
-            return type_ == "REP" || type_ == "DEALER" || type_ == "ROUTER" || type_ == "SERVER";
+            return type_ == "REP" || type_ == "DEALER" || type_ == "ROUTER";
         case ZMQ_ROUTER:
             return type_ == "REQ" || type_ == "DEALER" || type_ == "ROUTER";
         case ZMQ_PUSH:
@@ -178,7 +178,9 @@ bool zmq::mechanism_t::check_socket_type (const std::string& type_) const
         case ZMQ_PAIR:
             return type_ == "PAIR";
         case ZMQ_SERVER:
-            return type_ == "DEALER";
+            return type_ == "CLIENT";
+        case ZMQ_CLIENT:
+            return type_ == "CLIENT" || type_ == "SERVER";
         default:
             break;
     }

src/server.cpp

@@ -53,14 +53,6 @@ void zmq::server_t::xattach_pipe (pipe_t *pipe_, bool subscribe_to_all_)
     fq.attach (pipe_);    
 }
 
-int zmq::server_t::xsetsockopt (int option_, const void *optval_,
-    size_t optvallen_)
-{
-    errno = EINVAL;
-    return -1;
-}
-
-
 void zmq::server_t::xpipe_terminated (pipe_t *pipe_)
 {
     outpipes_t::iterator it = outpipes.find (pipe_->get_routing_id ());
@@ -88,12 +80,8 @@ void zmq::server_t::xwrite_activated (pipe_t *pipe_)
 
 int zmq::server_t::xsend (msg_t *msg_)
 {
-    // Server doesn't support multipart
+    zmq_assert(!(msg_->flags () & msg_t::more));    
-    if (msg_->flags () & msg_t::more) {
+    
-        errno = EINVAL;
-        return -1;
-    }
-
     //  Find the pipe associated with the routing stored in the message.    
     uint32_t routing_id = msg_->get_routing_id();
     outpipes_t::iterator it = outpipes.find (routing_id);
@@ -131,19 +119,25 @@ int zmq::server_t::xrecv (msg_t *msg_)
     pipe_t *pipe = NULL;
     int rc = fq.recvpipe (msg_, &pipe);
 
+    // Drop any messages with more flag
+    while (rc == 0 && msg_->flags () & msg_t::more) {
+
+        // drop all frames of the current multi-frame message
+        rc = fq.recvpipe (msg_, NULL);
+        
+        while (rc == 0 && msg_->flags () & msg_t::more)
+            rc = fq.recvpipe (msg_, NULL);            
+
+        // get the new message
+        if (rc == 0)            
+            rc = fq.recvpipe (msg_, &pipe);
+    }     
+
     if (rc != 0)
-        return -1;
+        return rc;   
 
     zmq_assert (pipe != NULL);
 
-    if (msg_->flags () & msg_t::more) {
-        msg_->close();
-        msg_->init();        
-
-        errno = EINVAL;
-        return -1;
-    }
-
     uint32_t routing_id = pipe->get_routing_id();
     msg_->set_routing_id(routing_id);
 

src/server.hpp

@@ -45,8 +45,7 @@ namespace zmq
         ~server_t ();
 
         //  Overrides of functions from socket_base_t.
-        void xattach_pipe (zmq::pipe_t *pipe_, bool subscribe_to_all_);
+        void xattach_pipe (zmq::pipe_t *pipe_, bool subscribe_to_all_);        
-        int xsetsockopt (int option_, const void *optval_, size_t optvallen_);
         int xsend (zmq::msg_t *msg_);
         int xrecv (zmq::msg_t *msg_);
         bool xhas_in ();

src/session_base.cpp

@@ -56,6 +56,7 @@ zmq::session_base_t *zmq::session_base_t::create (class io_thread_t *io_thread_,
     case ZMQ_PAIR:
     case ZMQ_STREAM:
     case ZMQ_SERVER:
+    case ZMQ_CLIENT:
         s = new (std::nothrow) session_base_t (io_thread_, active_,
             socket_, options_, addr_);
         break;

src/socket_base.cpp

@@ -71,6 +71,7 @@
 #include "xsub.hpp"
 #include "stream.hpp"
 #include "server.hpp"
+#include "client.hpp"
 
 bool zmq::socket_base_t::check_tag ()
 {
@@ -121,6 +122,9 @@ zmq::socket_base_t *zmq::socket_base_t::create (int type_, class ctx_t *parent_,
         case ZMQ_SERVER:
             s = new (std::nothrow) server_t (parent_, tid_, sid_);
             break;
+        case ZMQ_CLIENT:
+            s = new (std::nothrow) client_t (parent_, tid_, sid_);
+            break;
         default:
             errno = EINVAL;
             return NULL;

tests/test_client_server.cpp

@@ -21,14 +21,12 @@
 
 int main (void)
 {
-    printf("0000");
-
     setup_test_environment();
     void *ctx = zmq_ctx_new ();
     assert (ctx);
 
     void *server = zmq_socket (ctx, ZMQ_SERVER);
-    void *client = zmq_socket (ctx, ZMQ_DEALER);
+    void *client = zmq_socket (ctx, ZMQ_CLIENT);
 
     int rc;