/*
 * =====================================================================================
 *
 *       Filename:  pubsub.cpp
 *
 *    Description:  
 *
 *        Version:  1.0
 *        Created:  2021年03月24日 18时44分13秒
 *       Revision:  none
 *       Compiler:  gcc
 *
 *         Author:  Li Chao (), 
 *   Organization:  
 *
 * =====================================================================================
 */
#include "pubsub.h"
#include "bh_util.h"
#include "defs.h"

using namespace std::chrono_literals;
using namespace bhome_msg;

bool SocketPublish::Publish(const std::string &proc_id, const Topic &topic, const void *data, const size_t size, const int timeout_ms)
{
	try {
		MsgPublish pub;
		pub.set_topic(topic);
		pub.set_data(data, size);
		BHMsgHead head(InitMsgHead(GetType(pub), proc_id));
		MsgI imsg;
		if (imsg.MakeRC(shm(), head, pub)) {
			DEFER1(imsg.Release(shm()));
			return ShmMsgQueue::Send(shm(), BHTopicBusAddress(), imsg, timeout_ms);
		}
	} catch (...) {
	}
	return false;
}
namespace
{
inline void AddRoute(BHMsgHead &head, const MQId &id) { head.add_route()->set_mq_id(&id, sizeof(id)); }

} // namespace
bool SocketSubscribe::Subscribe(const std::string &proc_id, const std::vector<Topic> &topics, const int timeout_ms)
{
	try {
		MsgSubscribe sub;
		for (auto &topic : topics) {
			sub.add_topics(topic);
		}
		BHMsgHead head(InitMsgHead(GetType(sub), proc_id));
		AddRoute(head, mq().Id());

		return Send(&BHTopicBusAddress(), head, sub, timeout_ms);
	} catch (...) {
		return false;
	}
}

bool SocketSubscribe::StartRecv(const TopicDataCB &tdcb, int nworker)
{
	auto AsyncRecvProc = [this, tdcb](ShmSocket &, MsgI &imsg, BHMsgHead &head) {
		if (head.type() == kMsgTypePublish) {
			MsgPublish pub;
			if (imsg.ParseBody(pub)) {
				tdcb(head.proc_id(), pub.topic(), pub.data());
			}
		} else {
			// ignored, or dropped
		}
	};

	return tdcb && Start(AsyncRecvProc, nworker);
}

bool SocketSubscribe::RecvSub(std::string &proc_id, Topic &topic, std::string &data, const int timeout_ms)
{
	MsgI msg;
	BHMsgHead head;
	if (SyncRecv(msg, head, timeout_ms) && head.type() == kMsgTypePublish) {
		MsgPublish pub;
		if (msg.ParseBody(pub)) {
			head.mutable_proc_id()->swap(proc_id);
			pub.mutable_topic()->swap(topic);
			pub.mutable_data()->swap(data);
			return true;
		}
	}
	return false;
}