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FairMQ/fairmq/shmem/Socket.h
Giulio Eulisse 6dfea32aee Improve Events API 
If the call is interrupted by a signal, this will throw, which we clearly do not want. Simplifying the API to let the user decide what to do on error is probably the best option.
2021-05-04 22:54:19 +02:00

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/********************************************************************************
* Copyright (C) 2014 GSI Helmholtzzentrum fuer Schwerionenforschung GmbH *
* *
* This software is distributed under the terms of the *
* GNU Lesser General Public Licence (LGPL) version 3, *
* copied verbatim in the file "LICENSE" *
********************************************************************************/
#ifndef FAIR_MQ_SHMEM_SOCKET_H_
#define FAIR_MQ_SHMEM_SOCKET_H_
#include "Common.h"
#include "Manager.h"
#include "Message.h"
#include <FairMQSocket.h>
#include <FairMQMessage.h>
#include <FairMQLogger.h>
#include <fairmq/tools/Strings.h>
#include <zmq.h>
#include <atomic>
#include <memory> // make_unique
class FairMQTransportFactory;
namespace fair::mq::shmem
{
struct ZMsg
{
ZMsg() { int rc __attribute__((unused)) = zmq_msg_init(&fMsg); assert(rc == 0); }
explicit ZMsg(size_t size) { int rc __attribute__((unused)) = zmq_msg_init_size(&fMsg, size); assert(rc == 0); }
~ZMsg() { int rc __attribute__((unused)) = zmq_msg_close(&fMsg); assert(rc == 0); }
void* Data() { return zmq_msg_data(&fMsg); }
size_t Size() { return zmq_msg_size(&fMsg); }
zmq_msg_t* Msg() { return &fMsg; }
zmq_msg_t fMsg;
};
class Socket final : public fair::mq::Socket
{
public:
Socket(Manager& manager, const std::string& type, const std::string& name, const std::string& id, void* context, FairMQTransportFactory* fac = nullptr)
: fair::mq::Socket(fac)
, fSocket(nullptr)
, fManager(manager)
, fId(id + "." + name + "." + type)
, fBytesTx(0)
, fBytesRx(0)
, fMessagesTx(0)
, fMessagesRx(0)
, fTimeout(100)
{
assert(context);
if (type == "sub" || type == "pub") {
LOG(error) << "PUB/SUB socket type is not supported for shared memory transport";
throw SocketError("PUB/SUB socket type is not supported for shared memory transport");
}
fSocket = zmq_socket(context, GetConstant(type));
if (fSocket == nullptr) {
LOG(error) << "Failed creating socket " << fId << ", reason: " << zmq_strerror(errno);
throw SocketError(tools::ToString("Failed creating socket ", fId, ", reason: ", zmq_strerror(errno)));
}
if (zmq_setsockopt(fSocket, ZMQ_IDENTITY, fId.c_str(), fId.length()) != 0) {
LOG(error) << "Failed setting ZMQ_IDENTITY socket option, reason: " << zmq_strerror(errno);
}
// Tell socket to try and send/receive outstanding messages for <linger> milliseconds before terminating.
// Default value for ZeroMQ is -1, which is to wait forever.
int linger = 1000;
if (zmq_setsockopt(fSocket, ZMQ_LINGER, &linger, sizeof(linger)) != 0) {
LOG(error) << "Failed setting ZMQ_LINGER socket option, reason: " << zmq_strerror(errno);
}
if (zmq_setsockopt(fSocket, ZMQ_SNDTIMEO, &fTimeout, sizeof(fTimeout)) != 0) {
LOG(error) << "Failed setting ZMQ_SNDTIMEO socket option, reason: " << zmq_strerror(errno);
}
if (zmq_setsockopt(fSocket, ZMQ_RCVTIMEO, &fTimeout, sizeof(fTimeout)) != 0) {
LOG(error) << "Failed setting ZMQ_RCVTIMEO socket option, reason: " << zmq_strerror(errno);
}
// if (type == "sub")
// {
// if (zmq_setsockopt(fSocket, ZMQ_SUBSCRIBE, nullptr, 0) != 0)
// {
// LOG(error) << "Failed setting ZMQ_SUBSCRIBE socket option, reason: " << zmq_strerror(errno);
// }
// }
LOG(debug) << "Created socket " << GetId();
}
Socket(const Socket&) = delete;
Socket operator=(const Socket&) = delete;
std::string GetId() const override { return fId; }
bool Bind(const std::string& address) override
{
// LOG(info) << "binding socket " << fId << " on " << address;
if (zmq_bind(fSocket, address.c_str()) != 0) {
if (errno == EADDRINUSE) {
// do not print error in this case, this is handled by FairMQDevice in case no connection could be established after trying a number of random ports from a range.
return false;
}
LOG(error) << "Failed binding socket " << fId << ", reason: " << zmq_strerror(errno);
return false;
}
return true;
}
bool Connect(const std::string& address) override
{
// LOG(info) << "connecting socket " << fId << " on " << address;
if (zmq_connect(fSocket, address.c_str()) != 0) {
LOG(error) << "Failed connecting socket " << fId << ", reason: " << zmq_strerror(errno);
return false;
}
return true;
}
bool ShouldRetry(int flags, int timeout, int& elapsed) const
{
if ((flags & ZMQ_DONTWAIT) == 0) {
if (timeout > 0) {
elapsed += fTimeout;
if (elapsed >= timeout) {
return false;
}
}
return true;
} else {
return false;
}
}
int HandleErrors() const
{
if (zmq_errno() == ETERM) {
LOG(debug) << "Terminating socket " << fId;
return static_cast<int>(TransferCode::error);
} else {
LOG(error) << "Failed transfer on socket " << fId << ", reason: " << zmq_strerror(errno);
return static_cast<int>(TransferCode::error);
}
}
int64_t Send(MessagePtr& msg, const int timeout = -1) override
{
int flags = 0;
if (timeout == 0) {
flags = ZMQ_DONTWAIT;
}
int elapsed = 0;
Message* shmMsg = static_cast<Message*>(msg.get());
ZMsg zmqMsg(sizeof(MetaHeader));
std::memcpy(zmqMsg.Data(), &(shmMsg->fMeta), sizeof(MetaHeader));
while (true) {
int nbytes = zmq_msg_send(zmqMsg.Msg(), fSocket, flags);
if (nbytes > 0) {
shmMsg->fQueued = true;
++fMessagesTx;
size_t size = msg->GetSize();
fBytesTx += size;
return size;
} else if (zmq_errno() == EAGAIN || zmq_errno() == EINTR) {
if (fManager.Interrupted()) {
return static_cast<int>(TransferCode::interrupted);
} else if (ShouldRetry(flags, timeout, elapsed)) {
continue;
} else {
return static_cast<int>(TransferCode::timeout);
}
} else {
return HandleErrors();
}
}
return static_cast<int>(TransferCode::error);
}
int64_t Receive(MessagePtr& msg, const int timeout = -1) override
{
int flags = 0;
if (timeout == 0) {
flags = ZMQ_DONTWAIT;
}
int elapsed = 0;
ZMsg zmqMsg;
while (true) {
Message* shmMsg = static_cast<Message*>(msg.get());
int nbytes = zmq_msg_recv(zmqMsg.Msg(), fSocket, flags);
if (nbytes > 0) {
// check for number of received messages. must be 1
if (nbytes != sizeof(MetaHeader)) {
throw SocketError(
tools::ToString("Received message is not a valid FairMQ shared memory message. ",
"Possibly due to a misconfigured transport on the sender side. ",
"Expected size of ", sizeof(MetaHeader), " bytes, received ", nbytes));
}
MetaHeader* hdr = static_cast<MetaHeader*>(zmqMsg.Data());
size_t size = hdr->fSize;
shmMsg->fMeta = *hdr;
fBytesRx += size;
++fMessagesRx;
return size;
} else if (zmq_errno() == EAGAIN || zmq_errno() == EINTR) {
if (fManager.Interrupted()) {
return static_cast<int>(TransferCode::interrupted);
} else if (ShouldRetry(flags, timeout, elapsed)) {
continue;
} else {
return static_cast<int>(TransferCode::timeout);
}
} else {
return HandleErrors();
}
}
}
int64_t Send(std::vector<MessagePtr>& msgVec, const int timeout = -1) override
{
int flags = 0;
if (timeout == 0) {
flags = ZMQ_DONTWAIT;
}
int elapsed = 0;
// put it into zmq message
const unsigned int vecSize = msgVec.size();
ZMsg zmqMsg(vecSize * sizeof(MetaHeader));
// prepare the message with shm metas
MetaHeader* metas = static_cast<MetaHeader*>(zmqMsg.Data());
for (auto& msg : msgVec) {
Message* shmMsg = static_cast<Message*>(msg.get());
std::memcpy(metas++, &(shmMsg->fMeta), sizeof(MetaHeader));
}
while (true) {
int64_t totalSize = 0;
int nbytes = zmq_msg_send(zmqMsg.Msg(), fSocket, flags);
if (nbytes > 0) {
assert(static_cast<unsigned int>(nbytes) == (vecSize * sizeof(MetaHeader))); // all or nothing
for (auto& msg : msgVec) {
Message* shmMsg = static_cast<Message*>(msg.get());
shmMsg->fQueued = true;
totalSize += shmMsg->fMeta.fSize;
}
// store statistics on how many messages have been sent
fMessagesTx++;
fBytesTx += totalSize;
return totalSize;
} else if (zmq_errno() == EAGAIN || zmq_errno() == EINTR) {
if (fManager.Interrupted()) {
return static_cast<int>(TransferCode::interrupted);
} else if (ShouldRetry(flags, timeout, elapsed)) {
continue;
} else {
return static_cast<int>(TransferCode::timeout);
}
} else {
return HandleErrors();
}
}
return static_cast<int>(TransferCode::error);
}
int64_t Receive(std::vector<MessagePtr>& msgVec, const int timeout = -1) override
{
int flags = 0;
if (timeout == 0) {
flags = ZMQ_DONTWAIT;
}
int elapsed = 0;
ZMsg zmqMsg;
while (true) {
int64_t totalSize = 0;
int nbytes = zmq_msg_recv(zmqMsg.Msg(), fSocket, flags);
if (nbytes > 0) {
MetaHeader* hdrVec = static_cast<MetaHeader*>(zmqMsg.Data());
const auto hdrVecSize = zmqMsg.Size();
assert(hdrVecSize > 0);
if (hdrVecSize % sizeof(MetaHeader) != 0) {
throw SocketError(
tools::ToString("Received message is not a valid FairMQ shared memory message. ",
"Possibly due to a misconfigured transport on the sender side. ",
"Expected size of ", sizeof(MetaHeader), " bytes, received ", nbytes));
}
const auto numMessages = hdrVecSize / sizeof(MetaHeader);
msgVec.reserve(numMessages);
for (size_t m = 0; m < numMessages; m++) {
// create new message (part)
msgVec.emplace_back(std::make_unique<Message>(fManager, hdrVec[m], GetTransport()));
Message* shmMsg = static_cast<Message*>(msgVec.back().get());
totalSize += shmMsg->GetSize();
}
// store statistics on how many messages have been received (handle all parts as a single message)
fMessagesRx++;
fBytesRx += totalSize;
return totalSize;
} else if (zmq_errno() == EAGAIN || zmq_errno() == EINTR) {
if (fManager.Interrupted()) {
return static_cast<int>(TransferCode::interrupted);
} else if (ShouldRetry(flags, timeout, elapsed)) {
continue;
} else {
return static_cast<int>(TransferCode::timeout);
}
} else {
return HandleErrors();
}
}
return static_cast<int>(TransferCode::error);
}
void* GetSocket() const { return fSocket; }
void Close() override
{
// LOG(debug) << "Closing socket " << fId;
if (fSocket == nullptr) {
return;
}
if (zmq_close(fSocket) != 0) {
LOG(error) << "Failed closing socket " << fId << ", reason: " << zmq_strerror(errno);
}
fSocket = nullptr;
}
void SetOption(const std::string& option, const void* value, size_t valueSize) override
{
if (zmq_setsockopt(fSocket, GetConstant(option), value, valueSize) < 0) {
LOG(error) << "Failed setting socket option, reason: " << zmq_strerror(errno);
}
}
void GetOption(const std::string& option, void* value, size_t* valueSize) override
{
if (zmq_getsockopt(fSocket, GetConstant(option), value, valueSize) < 0) {
LOG(error) << "Failed getting socket option, reason: " << zmq_strerror(errno);
}
}
void SetLinger(const int value) override
{
if (zmq_setsockopt(fSocket, ZMQ_LINGER, &value, sizeof(value)) < 0) {
throw SocketError(tools::ToString("failed setting ZMQ_LINGER, reason: ", zmq_strerror(errno)));
}
}
int Events(uint32_t* events) override
{
size_t eventsSize = sizeof(uint32_t);
return zmq_getsockopt(fSocket, ZMQ_EVENTS, events, &eventsSize);
}
int GetLinger() const override
{
int value = 0;
size_t valueSize = sizeof(value);
if (zmq_getsockopt(fSocket, ZMQ_LINGER, &value, &valueSize) < 0) {
throw SocketError(tools::ToString("failed getting ZMQ_LINGER, reason: ", zmq_strerror(errno)));
}
return value;
}
void SetSndBufSize(const int value) override
{
if (zmq_setsockopt(fSocket, ZMQ_SNDHWM, &value, sizeof(value)) < 0) {
throw SocketError(tools::ToString("failed setting ZMQ_SNDHWM, reason: ", zmq_strerror(errno)));
}
}
int GetSndBufSize() const override
{
int value = 0;
size_t valueSize = sizeof(value);
if (zmq_getsockopt(fSocket, ZMQ_SNDHWM, &value, &valueSize) < 0) {
throw SocketError(tools::ToString("failed getting ZMQ_SNDHWM, reason: ", zmq_strerror(errno)));
}
return value;
}
void SetRcvBufSize(const int value) override
{
if (zmq_setsockopt(fSocket, ZMQ_RCVHWM, &value, sizeof(value)) < 0) {
throw SocketError(tools::ToString("failed setting ZMQ_RCVHWM, reason: ", zmq_strerror(errno)));
}
}
int GetRcvBufSize() const override
{
int value = 0;
size_t valueSize = sizeof(value);
if (zmq_getsockopt(fSocket, ZMQ_RCVHWM, &value, &valueSize) < 0) {
throw SocketError(tools::ToString("failed getting ZMQ_RCVHWM, reason: ", zmq_strerror(errno)));
}
return value;
}
void SetSndKernelSize(const int value) override
{
if (zmq_setsockopt(fSocket, ZMQ_SNDBUF, &value, sizeof(value)) < 0) {
throw SocketError(tools::ToString("failed getting ZMQ_SNDBUF, reason: ", zmq_strerror(errno)));
}
}
int GetSndKernelSize() const override
{
int value = 0;
size_t valueSize = sizeof(value);
if (zmq_getsockopt(fSocket, ZMQ_SNDBUF, &value, &valueSize) < 0) {
throw SocketError(tools::ToString("failed getting ZMQ_SNDBUF, reason: ", zmq_strerror(errno)));
}
return value;
}
void SetRcvKernelSize(const int value) override
{
if (zmq_setsockopt(fSocket, ZMQ_RCVBUF, &value, sizeof(value)) < 0) {
throw SocketError(tools::ToString("failed getting ZMQ_RCVBUF, reason: ", zmq_strerror(errno)));
}
}
int GetRcvKernelSize() const override
{
int value = 0;
size_t valueSize = sizeof(value);
if (zmq_getsockopt(fSocket, ZMQ_RCVBUF, &value, &valueSize) < 0) {
throw SocketError(tools::ToString("failed getting ZMQ_RCVBUF, reason: ", zmq_strerror(errno)));
}
return value;
}
unsigned long GetBytesTx() const override { return fBytesTx; }
unsigned long GetBytesRx() const override { return fBytesRx; }
unsigned long GetMessagesTx() const override { return fMessagesTx; }
unsigned long GetMessagesRx() const override { return fMessagesRx; }
static int GetConstant(const std::string& constant)
{
if (constant == "") return 0;
if (constant == "sub") return ZMQ_SUB;
if (constant == "pub") return ZMQ_PUB;
if (constant == "xsub") return ZMQ_XSUB;
if (constant == "xpub") return ZMQ_XPUB;
if (constant == "push") return ZMQ_PUSH;
if (constant == "pull") return ZMQ_PULL;
if (constant == "req") return ZMQ_REQ;
if (constant == "rep") return ZMQ_REP;
if (constant == "dealer") return ZMQ_DEALER;
if (constant == "router") return ZMQ_ROUTER;
if (constant == "pair") return ZMQ_PAIR;
if (constant == "snd-hwm") return ZMQ_SNDHWM;
if (constant == "rcv-hwm") return ZMQ_RCVHWM;
if (constant == "snd-size") return ZMQ_SNDBUF;
if (constant == "rcv-size") return ZMQ_RCVBUF;
if (constant == "snd-more") return ZMQ_SNDMORE;
if (constant == "rcv-more") return ZMQ_RCVMORE;
if (constant == "linger") return ZMQ_LINGER;
if (constant == "no-block") return ZMQ_DONTWAIT;
if (constant == "snd-more no-block") return ZMQ_DONTWAIT|ZMQ_SNDMORE;
if (constant == "fd") return ZMQ_FD;
if (constant == "events")
return ZMQ_EVENTS;
if (constant == "pollin")
return ZMQ_POLLIN;
if (constant == "pollout")
return ZMQ_POLLOUT;
throw SocketError(tools::ToString("GetConstant called with an invalid argument: ", constant));
}
~Socket() override { Close(); }
private:
void* fSocket;
Manager& fManager;
std::string fId;
std::atomic<unsigned long> fBytesTx;
std::atomic<unsigned long> fBytesRx;
std::atomic<unsigned long> fMessagesTx;
std::atomic<unsigned long> fMessagesRx;
int fTimeout;
};
} // namespace fair::mq::shmem
#endif /* FAIR_MQ_SHMEM_SOCKET_H_ */
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