/*
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* =====================================================================================
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*
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* Filename: pubsub_center.cpp
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*
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* Description: pub/sub center/manager
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*
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* Version: 1.0
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* Created: 2021年04月01日 09时29分04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_center.h"
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#include "bh_util.h"
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using namespace bhome_shm;
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namespace
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{
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class BusCenter
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{
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typedef std::set<MQId> Clients;
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std::unordered_map<Topic, Clients> records_;
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// todo cache data if send fail.
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public:
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template <class Iter>
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void SubScribe(const MQId &client, Iter topic_begin, Iter topic_end)
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{
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for (auto it = topic_begin; it != topic_end; ++it) {
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records_[*it].insert(client);
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}
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}
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template <class Iter>
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void UnsubScribe(const MQId &client, Iter topic_begin, Iter topic_end)
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{
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for (auto it = topic_begin; it != topic_end; ++it) {
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auto pos = records_.find(*it);
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if (pos != records_.end()) {
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if (pos->second.erase(client) && 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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};
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Clients FindClients(const std::string &topic)
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{
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Clients dests;
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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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};
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} // namespace
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bool PubSubCenter::Start(const int nworker)
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{
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auto bus_ptr = std::make_shared<Synced<BusCenter>>();
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auto onRecv = [bus_ptr, this](MsgI &imsg) {
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#ifndef NDEBUG
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static std::atomic<time_t> last(0);
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time_t now = 0;
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time(&now);
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if (last.exchange(now) < now) {
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printf("bus queue size: %ld\n", socket_.Pending());
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}
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#endif
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auto &bus = *bus_ptr;
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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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update(client, sub.topics());
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}
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};
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auto Sub = [&](const MQId &id, auto &topics) { bus->SubScribe(id, topics.begin(), topics.end()); };
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auto Unsub = [&](const MQId &id, auto &topics) { bus->UnsubScribe(id, topics.begin(), topics.end()); };
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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 Dispatch = [&](auto &&send1) {
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const auto &clients(bus->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) { ShmMsgQueue::Send(shm(), cli, imsg, 10); });
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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) { ShmMsgQueue::Send(shm(), cli, pubmsg, 10); });
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}
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};
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switch (msg.type()) {
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case kMsgTypeSubscribe: OnSubChange(Sub); break;
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case kMsgTypeUnsubscribe: OnSubChange(Unsub); 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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const int kMaxWorker = 16;
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return socket_.StartRaw(onRecv, std::min((nworker > 0 ? nworker : 2), kMaxWorker));
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}
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