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Diffstat (limited to 'external_libs/python/pyzmq-14.7.0/bundled/zeromq/src/req.cpp')
| -rw-r--r-- | external_libs/python/pyzmq-14.7.0/bundled/zeromq/src/req.cpp | 289 |
1 files changed, 289 insertions, 0 deletions
diff --git a/external_libs/python/pyzmq-14.7.0/bundled/zeromq/src/req.cpp b/external_libs/python/pyzmq-14.7.0/bundled/zeromq/src/req.cpp new file mode 100644 index 00000000..3a930349 --- /dev/null +++ b/external_libs/python/pyzmq-14.7.0/bundled/zeromq/src/req.cpp @@ -0,0 +1,289 @@ +/* + Copyright (c) 2007-2015 Contributors as noted in the AUTHORS file + + This file is part of libzmq, the ZeroMQ core engine in C++. + + libzmq is free software; you can redistribute it and/or modify it under + the terms of the GNU Lesser General Public License (LGPL) as published + by the Free Software Foundation; either version 3 of the License, or + (at your option) any later version. + + As a special exception, the Contributors give you permission to link + this library with independent modules to produce an executable, + regardless of the license terms of these independent modules, and to + copy and distribute the resulting executable under terms of your choice, + provided that you also meet, for each linked independent module, the + terms and conditions of the license of that module. An independent + module is a module which is not derived from or based on this library. + If you modify this library, you must extend this exception to your + version of the library. + + libzmq 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 "req.hpp" +#include "err.hpp" +#include "msg.hpp" +#include "wire.hpp" +#include "random.hpp" +#include "likely.hpp" + +zmq::req_t::req_t (class ctx_t *parent_, uint32_t tid_, int sid_) : + dealer_t (parent_, tid_, sid_), + receiving_reply (false), + message_begins (true), + reply_pipe (NULL), + request_id_frames_enabled (false), + request_id (generate_random()), + strict (true) +{ + options.type = ZMQ_REQ; +} + +zmq::req_t::~req_t () +{ +} + +int zmq::req_t::xsend (msg_t *msg_) +{ + // If we've sent a request and we still haven't got the reply, + // we can't send another request unless the strict option is disabled. + if (receiving_reply) { + if (strict) { + errno = EFSM; + return -1; + } + + if (reply_pipe) + reply_pipe->terminate (false); + receiving_reply = false; + message_begins = true; + } + + // First part of the request is the request identity. + if (message_begins) { + reply_pipe = NULL; + + if (request_id_frames_enabled) { + request_id++; + + msg_t id; + int rc = id.init_data (&request_id, sizeof (request_id), NULL, NULL); + errno_assert (rc == 0); + id.set_flags (msg_t::more); + + rc = dealer_t::sendpipe (&id, &reply_pipe); + if (rc != 0) + return -1; + } + + msg_t bottom; + int rc = bottom.init (); + errno_assert (rc == 0); + bottom.set_flags (msg_t::more); + + rc = dealer_t::sendpipe (&bottom, &reply_pipe); + if (rc != 0) + return -1; + zmq_assert (reply_pipe); + + message_begins = false; + + // Eat all currently avaliable messages before the request is fully + // sent. This is done to avoid: + // REQ sends request to A, A replies, B replies too. + // A's reply was first and matches, that is used. + // An hour later REQ sends a request to B. B's old reply is used. + msg_t drop; + while (true) { + rc = drop.init (); + errno_assert (rc == 0); + rc = dealer_t::xrecv (&drop); + if (rc != 0) + break; + drop.close (); + } + } + + bool more = msg_->flags () & msg_t::more ? true : false; + + int rc = dealer_t::xsend (msg_); + if (rc != 0) + return rc; + + // If the request was fully sent, flip the FSM into reply-receiving state. + if (!more) { + receiving_reply = true; + message_begins = true; + } + + return 0; +} + +int zmq::req_t::xrecv (msg_t *msg_) +{ + // If request wasn't send, we can't wait for reply. + if (!receiving_reply) { + errno = EFSM; + return -1; + } + + // Skip messages until one with the right first frames is found. + while (message_begins) { + // If enabled, the first frame must have the correct request_id. + if (request_id_frames_enabled) { + int rc = recv_reply_pipe (msg_); + if (rc != 0) + return rc; + + if (unlikely (!(msg_->flags () & msg_t::more) || + msg_->size () != sizeof (request_id) || + *static_cast<uint32_t *> (msg_->data ()) != request_id)) { + // Skip the remaining frames and try the next message + while (msg_->flags () & msg_t::more) { + rc = recv_reply_pipe (msg_); + errno_assert (rc == 0); + } + continue; + } + } + + // The next frame must be 0. + // TODO: Failing this check should also close the connection with the peer! + int rc = recv_reply_pipe (msg_); + if (rc != 0) + return rc; + + if (unlikely (!(msg_->flags () & msg_t::more) || msg_->size () != 0)) { + // Skip the remaining frames and try the next message + while (msg_->flags () & msg_t::more) { + rc = recv_reply_pipe (msg_); + errno_assert (rc == 0); + } + continue; + } + + message_begins = false; + } + + int rc = recv_reply_pipe (msg_); + if (rc != 0) + return rc; + + // If the reply is fully received, flip the FSM into request-sending state. + if (!(msg_->flags () & msg_t::more)) { + receiving_reply = false; + message_begins = true; + } + + return 0; +} + +bool zmq::req_t::xhas_in () +{ + // TODO: Duplicates should be removed here. + + if (!receiving_reply) + return false; + + return dealer_t::xhas_in (); +} + +bool zmq::req_t::xhas_out () +{ + if (receiving_reply) + return false; + + return dealer_t::xhas_out (); +} + +int zmq::req_t::xsetsockopt (int option_, const void *optval_, size_t optvallen_) +{ + bool is_int = (optvallen_ == sizeof (int)); + int value = is_int? *((int *) optval_): 0; + switch (option_) { + case ZMQ_REQ_CORRELATE: + if (is_int && value >= 0) { + request_id_frames_enabled = (value != 0); + return 0; + } + break; + + case ZMQ_REQ_RELAXED: + if (is_int && value >= 0) { + strict = (value == 0); + return 0; + } + break; + + default: + break; + } + + return dealer_t::xsetsockopt (option_, optval_, optvallen_); +} + +void zmq::req_t::xpipe_terminated (pipe_t *pipe_) +{ + if (reply_pipe == pipe_) + reply_pipe = NULL; + dealer_t::xpipe_terminated (pipe_); +} + +int zmq::req_t::recv_reply_pipe (msg_t *msg_) +{ + while (true) { + pipe_t *pipe = NULL; + int rc = dealer_t::recvpipe (msg_, &pipe); + if (rc != 0) + return rc; + if (!reply_pipe || pipe == reply_pipe) + return 0; + } +} + +zmq::req_session_t::req_session_t (io_thread_t *io_thread_, bool connect_, + socket_base_t *socket_, const options_t &options_, + address_t *addr_) : + session_base_t (io_thread_, connect_, socket_, options_, addr_), + state (bottom) +{ +} + +zmq::req_session_t::~req_session_t () +{ +} + +int zmq::req_session_t::push_msg (msg_t *msg_) +{ + switch (state) { + case bottom: + if (msg_->flags () == msg_t::more && msg_->size () == 0) { + state = body; + return session_base_t::push_msg (msg_); + } + break; + case body: + if (msg_->flags () == msg_t::more) + return session_base_t::push_msg (msg_); + if (msg_->flags () == 0) { + state = bottom; + return session_base_t::push_msg (msg_); + } + break; + } + errno = EFAULT; + return -1; +} + +void zmq::req_session_t::reset () +{ + session_base_t::reset (); + state = bottom; +} |