server.cpp 4.24 KB
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/*
    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 "server.hpp"
#include "pipe.hpp"
#include "wire.hpp"
#include "random.hpp"
#include "likely.hpp"
#include "err.hpp"

zmq::server_t::server_t (class ctx_t *parent_, uint32_t tid_, int sid_) :
    socket_base_t (parent_, tid_, sid_),
    next_rid (generate_random ())
{
    options.type = ZMQ_SERVER;    
}

zmq::server_t::~server_t ()
{    
    zmq_assert (outpipes.empty ());
}

void zmq::server_t::xattach_pipe (pipe_t *pipe_, bool subscribe_to_all_)
{
    // subscribe_to_all_ is unused
    (void)subscribe_to_all_;

    zmq_assert (pipe_);    

    uint32_t routing_id = next_rid++;
    pipe_->set_routing_id (routing_id);
    //  Add the record into output pipes lookup table
    outpipe_t outpipe = {pipe_, true};
    bool ok = outpipes.insert (outpipes_t::value_type (routing_id, outpipe)).second;
    zmq_assert (ok);
    
    fq.attach (pipe_);    
}

void zmq::server_t::xpipe_terminated (pipe_t *pipe_)
{
    outpipes_t::iterator it = outpipes.find (pipe_->get_routing_id ());
    zmq_assert (it != outpipes.end ());
    outpipes.erase (it);
    fq.pipe_terminated (pipe_);    
}

void zmq::server_t::xread_activated (pipe_t *pipe_)
{    
    fq.activated (pipe_); 
}

void zmq::server_t::xwrite_activated (pipe_t *pipe_)
{
    outpipes_t::iterator it;
    for (it = outpipes.begin (); it != outpipes.end (); ++it)
        if (it->second.pipe == pipe_)
            break;

    zmq_assert (it != outpipes.end ());
    zmq_assert (!it->second.active);
    it->second.active = true;
}

int zmq::server_t::xsend (msg_t *msg_)
{
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    zmq_assert(!(msg_->flags () & msg_t::more));    
    
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    //  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);
    
    if (it != outpipes.end ()) {        
        if (!it->second.pipe->check_write ()) {
            it->second.active = false;            
            errno = EAGAIN;
            return -1;            
        }
    }
    else {        
        errno = EHOSTUNREACH;
        return -1;
    }

    bool ok = it->second.pipe->write (msg_);
    if (unlikely (!ok)) {
        // Message failed to send - we must close it ourselves.
        int rc = msg_->close ();
        errno_assert (rc == 0);
    } else {
        it->second.pipe->flush ();
    }
        
    //  Detach the message from the data buffer.
    int rc = msg_->init ();
    errno_assert (rc == 0);

    return 0;
}

int zmq::server_t::xrecv (msg_t *msg_)
{    
    pipe_t *pipe = NULL;
    int rc = fq.recvpipe (msg_, &pipe);

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    // Drop any messages with more flag
    while (rc == 0 && msg_->flags () & msg_t::more) {
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        // 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);            
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        // get the new message
        if (rc == 0)            
            rc = fq.recvpipe (msg_, &pipe);
    }     
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    if (rc != 0)
        return rc;   

    zmq_assert (pipe != NULL);
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    uint32_t routing_id = pipe->get_routing_id();
    msg_->set_routing_id(routing_id);

    return 0;
}

bool zmq::server_t::xhas_in ()
{
    return fq.has_in ();
}

bool zmq::server_t::xhas_out ()
{
    //  In theory, SERVER socket is always ready for writing. Whether actual
    //  attempt to write succeeds depends on whitch pipe the message is going
    //  to be routed to.
    return true;
}

zmq::blob_t zmq::server_t::get_credential () const
{
    return fq.get_credential ();
}