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REQ socket implementation is layered on top of XREQ

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This commit is contained in:
Martin Sustrik
2010-08-07 09:52:34 +02:00
parent f77edfce26
commit 3e97c0fef4
4 changed files with 47 additions and 263 deletions
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243
src/req.cpp
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@@ -21,129 +21,16 @@
#include "req.hpp"
#include "err.hpp"
#include "pipe.hpp"
zmq::req_t::req_t (class ctx_t *parent_, uint32_t slot_) :
socket_base_t (parent_, slot_),
active (0),
current (0),
xreq_t (parent_, slot_),
receiving_reply (false),
reply_pipe_active (false),
more (false),
reply_pipe (NULL)
message_begins (true)
{
options.requires_in = true;
options.requires_out = true;
}
zmq::req_t::~req_t ()
{
zmq_assert (in_pipes.empty ());
zmq_assert (out_pipes.empty ());
}
void zmq::req_t::xattach_pipes (reader_t *inpipe_, writer_t *outpipe_,
const blob_t &peer_identity_)
{
zmq_assert (inpipe_ && outpipe_);
zmq_assert (in_pipes.size () == out_pipes.size ());
inpipe_->set_event_sink (this);
in_pipes.push_back (inpipe_);
in_pipes.swap (active, in_pipes.size () - 1);
outpipe_->set_event_sink (this);
out_pipes.push_back (outpipe_);
out_pipes.swap (active, out_pipes.size () - 1);
active++;
}
void zmq::req_t::xterm_pipes ()
{
for (in_pipes_t::size_type i = 0; i != in_pipes.size (); i++)
in_pipes [i]->terminate ();
for (out_pipes_t::size_type i = 0; i != out_pipes.size (); i++)
out_pipes [i]->terminate ();
}
void zmq::req_t::terminated (reader_t *pipe_)
{
zmq_assert (!receiving_reply || !more || reply_pipe != pipe_);
zmq_assert (pipe_);
zmq_assert (in_pipes.size () == out_pipes.size ());
// TODO: The pipe we are awaiting the reply from is detached. What now?
if (receiving_reply && pipe_ == reply_pipe) {
zmq_assert (false);
}
in_pipes_t::size_type index = in_pipes.index (pipe_);
// ???
if (!zombie) {
if (out_pipes [index])
out_pipes [index]->terminate ();
out_pipes.erase (index);
}
in_pipes.erase (index);
if (index < active) {
active--;
if (current == active)
current = 0;
}
}
void zmq::req_t::terminated (writer_t *pipe_)
{
zmq_assert (receiving_reply || !more || out_pipes [current] != pipe_);
zmq_assert (pipe_);
zmq_assert (in_pipes.size () == out_pipes.size ());
out_pipes_t::size_type index = out_pipes.index (pipe_);
// ???
if (!zombie) {
if (in_pipes [index])
in_pipes [index]->terminate ();
in_pipes.erase (index);
}
out_pipes.erase (index);
if (index < active) {
active--;
if (current == active)
current = 0;
}
}
bool zmq::req_t::xhas_pipes ()
{
return !in_pipes.empty () || !out_pipes.empty ();
}
void zmq::req_t::activated (reader_t *pipe_)
{
// TODO: Actually, misbehaving peer can cause this kind of thing.
// Handle it decently, presumably kill the offending connection.
zmq_assert (pipe_ == reply_pipe);
reply_pipe_active = true;
}
void zmq::req_t::activated (writer_t *pipe_)
{
out_pipes_t::size_type index = out_pipes.index (pipe_);
zmq_assert (index >= active);
if (in_pipes [index] != NULL) {
in_pipes.swap (index, active);
out_pipes.swap (index, active);
active++;
}
}
int zmq::req_t::xsend (zmq_msg_t *msg_, int flags_)
@@ -155,99 +42,58 @@ int zmq::req_t::xsend (zmq_msg_t *msg_, int flags_)
return -1;
}
while (active > 0) {
if (out_pipes [current]->check_write ())
break;
zmq_assert (!more);
active--;
if (current < active) {
in_pipes.swap (current, active);
out_pipes.swap (current, active);
}
else
current = 0;
}
if (active == 0) {
errno = EAGAIN;
return -1;
}
// If we are starting to send the request, generate a prefix.
if (!more) {
// First part of the request is empty message part (stack bottom).
if (message_begins) {
zmq_msg_t prefix;
int rc = zmq_msg_init (&prefix);
zmq_assert (rc == 0);
prefix.flags |= ZMQ_MSG_MORE;
bool written = out_pipes [current]->write (&prefix);
zmq_assert (written);
prefix.flags = ZMQ_MSG_MORE;
rc = xreq_t::xsend (&prefix, flags_);
if (rc != 0)
return rc;
message_begins = false;
}
// Push the message to the selected pipe.
bool written = out_pipes [current]->write (msg_);
zmq_assert (written);
more = msg_->flags & ZMQ_MSG_MORE;
bool more = msg_->flags & ZMQ_MSG_MORE;
int rc = xreq_t::xsend (msg_, flags_);
if (rc != 0)
return rc;
// If the request was fully sent, flip the FSM into reply-receiving state.
if (!more) {
out_pipes [current]->flush ();
receiving_reply = true;
reply_pipe = in_pipes [current];
// We can safely assume that the reply pipe is active as the last time
// we've used it we've read the reply and haven't tried to read from it
// anymore.
reply_pipe_active = true;
// Move to the next pipe (load-balancing).
current = (current + 1) % active;
message_begins = true;
}
// Detach the message from the data buffer.
int rc = zmq_msg_init (msg_);
zmq_assert (rc == 0);
return 0;
}
int zmq::req_t::xrecv (zmq_msg_t *msg_, int flags_)
{
// Deallocate old content of the message.
int rc = zmq_msg_close (msg_);
zmq_assert (rc == 0);
// If request wasn't send, we can't wait for reply.
if (!receiving_reply) {
zmq_msg_init (msg_);
errno = EFSM;
return -1;
}
// Get the reply from the reply pipe.
if (!reply_pipe_active || !reply_pipe->read (msg_)) {
reply_pipe_active = false;
zmq_msg_init (msg_);
errno = EAGAIN;
return -1;
}
// If we are starting to receive new reply, check whether prefix
// is well-formed and drop it.
if (!more) {
// First part of the reply should be empty message part (stack bottom).
if (message_begins) {
int rc = xreq_t::xrecv (msg_, flags_);
if (rc != 0)
return rc;
zmq_assert (msg_->flags & ZMQ_MSG_MORE);
zmq_assert (zmq_msg_size (msg_) == 0);
rc = zmq_msg_close (msg_);
zmq_assert (rc == 0);
// Get the actual reply.
bool recvd = reply_pipe->read (msg_);
zmq_assert (recvd);
}
// If this was last part of the reply, switch to request phase.
more = msg_->flags & ZMQ_MSG_MORE;
if (!more) {
int rc = xreq_t::xrecv (msg_, flags_);
if (rc != 0)
return rc;
// If the reply is fully received, flip the FSM into request-sending state.
if (!(msg_->flags & ZMQ_MSG_MORE)) {
receiving_reply = false;
reply_pipe = NULL;
message_begins = true;
}
return 0;
@@ -255,43 +101,18 @@ int zmq::req_t::xrecv (zmq_msg_t *msg_, int flags_)
bool zmq::req_t::xhas_in ()
{
if (receiving_reply && more)
return true;
if (!receiving_reply || !reply_pipe_active)
if (!receiving_reply)
return false;
zmq_assert (reply_pipe);
if (!reply_pipe->check_read ()) {
reply_pipe_active = false;
return false;
}
return true;
return xreq_t::xhas_in ();
}
bool zmq::req_t::xhas_out ()
{
if (!receiving_reply && more)
return true;
if (receiving_reply)
return false;
while (active > 0) {
if (out_pipes [current]->check_write ())
return true;;
active--;
if (current < active) {
in_pipes.swap (current, active);
out_pipes.swap (current, active);
}
else
current = 0;
}
return false;
return xreq_t::xhas_out ();
}