/*
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* =====================================================================================
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*
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* Filename: pubsub.cpp
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*
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* Description:
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*
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* Version: 1.0
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* Created: 2021年03月24日 18时44分13秒
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* Revision: none
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* Compiler: gcc
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*
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* Author: Li Chao (),
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* Organization:
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*
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* =====================================================================================
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*/
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#include "pubsub.h"
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#include "bh_util.h"
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#include "defs.h"
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#include <chrono>
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namespace bhome_shm
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{
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using namespace std::chrono_literals;
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const int kMaxWorker = 16;
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using namespace bhome_msg;
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BusManager::BusManager(SharedMemory &shm) :
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shm_(shm),
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busq_(kBHBusQueueId, shm, 16),
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run_(false)
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{
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}
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BusManager::~BusManager()
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{
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Stop();
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}
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bool BusManager::Start(const int nworker)
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{
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std::lock_guard<std::mutex> guard(mutex_);
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StopNoLock();
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// start
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auto Worker = [&]() {
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while (this->run_) {
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BusManager &self = *this;
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MsgI msg;
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const int timeout_ms = 100;
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if (self.busq_.Recv(msg, timeout_ms)) {
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self.OnMsg(msg);
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}
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}
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};
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run_.store(true);
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const int n = std::min(nworker, kMaxWorker);
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for (int i = 0; i < n; ++i) {
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workers_.emplace_back(Worker);
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}
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return true;
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}
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bool BusManager::Stop()
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{
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std::lock_guard<std::mutex> guard(mutex_);
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return StopNoLock();
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}
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bool BusManager::StopNoLock()
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{
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if (run_.exchange(false)) {
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for (auto &w : workers_) {
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if (w.joinable()) {
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w.join();
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}
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}
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return true;
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}
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return false;
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}
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void BusManager::OnMsg(MsgI &imsg)
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{
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DEFER1(imsg.Release(shm_));
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BHMsg msg;
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if (!imsg.Unpack(msg)) {
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return;
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}
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auto OnSubChange = [&](auto &&update) {
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DataSub sub;
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if (!msg.route().empty() && sub.ParseFromString(msg.body()) && !sub.topics().empty()) {
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assert(sizeof(MQId) == msg.route(0).mq_id().size());
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MQId client;
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memcpy(&client, msg.route(0).mq_id().data(), sizeof(client));
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std::lock_guard<std::mutex> guard(mutex_);
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auto &topics = sub.topics();
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for (auto &topic : topics) {
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try {
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update(topic, client);
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} catch (...) {
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//TODO log error
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}
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}
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}
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};
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auto Sub1 = [this](const std::string &topic, const MQId &id) {
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records_[topic].insert(id);
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};
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auto Unsub1 = [this](const std::string &topic, const MQId &id) {
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auto pos = records_.find(topic);
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if (pos != records_.end()) {
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if (pos->second.erase(id) && pos->second.empty()) {
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records_.erase(pos);
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}
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}
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};
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auto OnPublish = [&]() {
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DataPub pub;
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if (!pub.ParseFromString(msg.body())) {
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return;
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}
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auto FindClients = [&](const std::string &topic) {
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Clients dests;
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std::lock_guard<std::mutex> guard(mutex_);
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auto Find1 = [&](const std::string &t) {
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auto pos = records_.find(topic);
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if (pos != records_.end() && !pos->second.empty()) {
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auto &clients = pos->second;
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for (auto &cli : clients) {
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dests.insert(cli);
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}
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}
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};
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Find1(topic);
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//TODO check and adjust topic on client side sub/pub.
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size_t pos = 0;
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while (true) {
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pos = topic.find(kTopicSep, pos);
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if (pos == topic.npos || ++pos == topic.size()) {
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// Find1(std::string()); // sub all.
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break;
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} else {
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Find1(topic.substr(0, pos));
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}
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}
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return dests;
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};
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auto Dispatch = [&](auto &&send1) {
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const Clients &clients(FindClients(pub.topic()));
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for (auto &cli : clients) {
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send1(cli);
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}
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};
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if (imsg.IsCounted()) {
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Dispatch([&](const MQId &cli) { busq_.Send(cli, imsg, 100); });
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} else {
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MsgI pubmsg;
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if (!pubmsg.MakeRC(shm_, msg)) { return; }
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DEFER1(pubmsg.Release(shm_));
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Dispatch([&](const MQId &cli) { busq_.Send(cli, pubmsg, 100); });
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}
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};
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switch (msg.type()) {
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case kMsgTypeSubscribe: OnSubChange(Sub1); break;
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case kMsgTypeUnsubscribe: OnSubChange(Unsub1); break;
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case kMsgTypePublish: OnPublish(); break;
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default: break;
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}
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}
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} // namespace bhome_shm
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