From ae17d1439b35b55212c3a30712e0a60b1d6a99c0 Mon Sep 17 00:00:00 2001
From: lichao <lichao@aiotlink.com>
Date: 星期三, 30 六月 2021 11:15:53 +0800
Subject: [PATCH] support tcp pub/sub.

---
 box/center.cpp |  810 +++++----------------------------------------------------
 1 files changed, 70 insertions(+), 740 deletions(-)

diff --git a/box/center.cpp b/box/center.cpp
index f140289..e0abbb3 100644
--- a/box/center.cpp
+++ b/box/center.cpp
@@ -16,12 +16,12 @@
  * =====================================================================================
  */
 #include "center.h"
-#include "bh_util.h"
-#include "defs.h"
-#include "log.h"
-#include "shm.h"
+#include "center_topic_node.h"
+#include "io_service.h"
+#include "node_center.h"
+#include "tcp_proxy.h"
+#include "tcp_server.h"
 #include <chrono>
-#include <unordered_map>
 
 using namespace std::chrono;
 using namespace std::chrono_literals;
@@ -33,690 +33,6 @@
 namespace
 {
 
-typedef std::string ProcId;
-typedef size_t ProcIndex; // max local procs.
-const int kMaxProcs = 65536;
-
-// record all procs ever registered, always grow, never remove.
-// mainly for node to request msg allocation.
-// use index instead of MQId to save some bits.
-class ProcRecords
-{
-public:
-	struct ProcRec {
-		ProcId proc_;
-		MQId ssn_ = 0;
-	};
-
-	ProcRecords() { procs_.reserve(kMaxProcs); }
-
-	ProcIndex Put(const ProcId &proc_id, const MQId ssn)
-	{
-		if (procs_.size() >= kMaxProcs) {
-			return -1;
-		}
-		auto pos_isnew = proc_index_.emplace(proc_id, procs_.size());
-		int index = pos_isnew.first->second;
-		if (pos_isnew.second) {
-			procs_.emplace_back(ProcRec{proc_id, ssn});
-		} else { // update ssn
-			procs_[index].ssn_ = ssn;
-		}
-		return index;
-	}
-	const ProcRec &Get(const ProcIndex index) const
-	{
-		static ProcRec empty_rec;
-		return (index < procs_.size()) ? procs_[index] : empty_rec;
-	}
-
-private:
-	std::unordered_map<ProcId, size_t> proc_index_;
-	std::vector<ProcRec> procs_;
-};
-
-class MsgRecords
-{
-	typedef int64_t MsgId;
-	typedef int64_t Offset;
-
-public:
-	void RecordMsg(const MsgI &msg) { msgs_.emplace(msg.id(), msg.Offset()); }
-	void FreeMsg(MsgId id)
-	{
-		auto pos = msgs_.find(id);
-		if (pos != msgs_.end()) {
-			ShmMsg(pos->second).Free();
-			msgs_.erase(pos);
-		} else {
-			LOG_TRACE() << "ignore late free request.";
-		}
-	}
-	void AutoRemove()
-	{
-		auto now = NowSec();
-		if (now < time_to_clean_) {
-			return;
-		}
-		// LOG_FUNCTION;
-		time_to_clean_ = now + 1;
-		int64_t limit = std::max(10000ul, msgs_.size() / 10);
-		int64_t n = 0;
-		auto it = msgs_.begin();
-		while (it != msgs_.end() && --limit > 0) {
-			ShmMsg msg(it->second);
-			auto Free = [&]() {
-				msg.Free();
-				it = msgs_.erase(it);
-				++n;
-			};
-			int n = now - msg.timestamp();
-			if (n < 10) {
-				++it;
-			} else if (msg.Count() == 0) {
-				Free();
-			} else if (n > 60) {
-				Free();
-			}
-		}
-		if (n > 0) {
-			LOG_DEBUG() << "~~~~~~~~~~~~~~~~ auto release msgs: " << n;
-		}
-	}
-	size_t size() const { return msgs_.size(); }
-	void DebugPrint() const
-	{
-		LOG_DEBUG() << "msgs : " << size();
-		int i = 0;
-		int total_count = 0;
-		for (auto &kv : msgs_) {
-			MsgI msg(kv.second);
-			total_count += msg.Count();
-			LOG_TRACE() << "  " << i++ << ": msg id: " << kv.first << ", offset: " << kv.second << ", count: " << msg.Count() << ", size: " << msg.Size();
-		}
-		LOG_DEBUG() << "total count: " << total_count;
-	}
-
-private:
-	std::unordered_map<MsgId, Offset> msgs_;
-	int64_t time_to_clean_ = 0;
-};
-
-//TODO check proc_id
-class NodeCenter
-{
-public:
-	typedef MQId Address;
-	typedef bhome_msg::ProcInfo ProcInfo;
-	typedef std::function<void(Address const)> Cleaner;
-
-private:
-	enum {
-		kStateInvalid,
-		kStateNormal,
-		kStateOffline,
-		kStateKillme,
-	};
-
-	struct ProcState {
-		int64_t timestamp_ = 0;
-		uint32_t flag_ = 0; // reserved
-		void PutOffline(const int64_t offline_time)
-		{
-			timestamp_ = NowSec() - offline_time;
-			flag_ = kStateOffline;
-		}
-		void UpdateState(const int64_t now, const int64_t offline_time, const int64_t kill_time)
-		{
-			auto diff = now - timestamp_;
-			LOG_DEBUG() << "state " << this << " diff: " << diff;
-			if (diff < offline_time) {
-				flag_ = kStateNormal;
-			} else if (diff < kill_time) {
-				flag_ = kStateOffline;
-			} else {
-				flag_ = kStateKillme;
-			}
-		}
-	};
-	typedef std::unordered_map<Address, std::set<Topic>> AddressTopics;
-
-	struct NodeInfo {
-		ProcState state_;               // state
-		std::map<MQId, int64_t> addrs_; // registered mqs
-		ProcInfo proc_;                 //
-		AddressTopics services_;        // address: topics
-		AddressTopics subscriptions_;   // address: topics
-	};
-	typedef std::shared_ptr<NodeInfo> Node;
-	typedef std::weak_ptr<NodeInfo> WeakNode;
-
-	struct TopicDest {
-		MQId mq_id_;
-		int64_t mq_abs_addr_;
-		WeakNode weak_node_;
-		bool operator<(const TopicDest &a) const { return mq_id_ < a.mq_id_; }
-	};
-	inline MQId SrcAddr(const BHMsgHead &head) { return head.route(0).mq_id(); }
-	inline int64_t SrcAbsAddr(const BHMsgHead &head) { return head.route(0).abs_addr(); }
-	inline bool MatchAddr(std::map<Address, int64_t> const &addrs, const Address &addr) { return addrs.find(addr) != addrs.end(); }
-
-	NodeCenter(const std::string &id, const Cleaner &cleaner, const int64_t offline_time, const int64_t kill_time) :
-	    id_(id), cleaner_(cleaner), offline_time_(offline_time), kill_time_(kill_time), last_check_time_(0) {}
-
-public:
-	typedef std::set<TopicDest> Clients;
-
-	NodeCenter(const std::string &id, const Cleaner &cleaner, const steady_clock::duration offline_time, const steady_clock::duration kill_time) :
-	    NodeCenter(id, cleaner, duration_cast<seconds>(offline_time).count(), duration_cast<seconds>(kill_time).count()) {}
-
-	// center name, no relative to shm.
-	const std::string &id() const { return id_; }
-	int64_t OnNodeInit(ShmSocket &socket, const int64_t val)
-	{
-		LOG_FUNCTION;
-		SharedMemory &shm = socket.shm();
-		MQId ssn = (val >> 4) & MaskBits(56);
-		int reply = EncodeCmd(eCmdNodeInitReply);
-
-		if (nodes_.find(ssn) != nodes_.end()) {
-			return reply; // ignore if exists.
-		}
-
-		auto UpdateRegInfo = [&](Node &node) {
-			node->state_.timestamp_ = NowSec() - offline_time_;
-			node->state_.UpdateState(NowSec(), offline_time_, kill_time_);
-
-			// create sockets.
-			try {
-				ShmSocket tmp(shm, true, ssn, 16);
-				node->addrs_.emplace(ssn, tmp.AbsAddr());
-				return true;
-			} catch (...) {
-				return false;
-			}
-		};
-
-		auto PrepareProcInit = [&](Node &node) {
-			bool r = false;
-			ShmMsg init_msg;
-			DEFER1(init_msg.Release());
-			MsgProcInit body;
-			auto head = InitMsgHead(GetType(body), id(), ssn);
-			return init_msg.Make(GetAllocSize(CalcAllocIndex(900))) &&
-			       init_msg.Fill(ShmMsg::Serialize(head, body)) &&
-			       SendAllocMsg(socket, {ssn, node->addrs_[ssn]}, init_msg);
-		};
-
-		Node node(new NodeInfo);
-		if (UpdateRegInfo(node) && PrepareProcInit(node)) {
-			reply |= (node->addrs_[ssn] << 4);
-			nodes_[ssn] = node;
-			LOG_INFO() << "new node ssn (" << ssn << ") init";
-		} else {
-			ShmSocket::Remove(shm, ssn);
-		}
-		return reply;
-	}
-	void RecordMsg(const MsgI &msg)
-	{
-		msg.reset_managed(true);
-		msgs_.RecordMsg(msg);
-	}
-
-	bool SendAllocReply(ShmSocket &socket, const MQInfo &dest, const int64_t reply, const MsgI &msg)
-	{
-		RecordMsg(msg);
-		auto onExpireFree = [this, msg](const SendQ::Data &) { msgs_.FreeMsg(msg.id()); };
-		return socket.Send(dest, reply, onExpireFree);
-	}
-	bool SendAllocMsg(ShmSocket &socket, const MQInfo &dest, const MsgI &msg)
-	{
-		RecordMsg(msg);
-		return socket.Send(dest, msg);
-	}
-
-	void OnAlloc(ShmSocket &socket, const int64_t val)
-	{
-		// LOG_FUNCTION;
-		// 8bit size, 4bit socket index, 16bit proc index, 28bit id, ,4bit cmd+flag
-		int64_t msg_id = (val >> 4) & MaskBits(28);
-		int proc_index = (val >> 32) & MaskBits(16);
-		int socket_index = ((val) >> 48) & MaskBits(4);
-		auto proc_rec(procs_.Get(proc_index));
-		if (proc_rec.proc_.empty()) {
-			return;
-		}
-
-		MQInfo dest = {proc_rec.ssn_ + socket_index, 0};
-		auto FindMq = [&]() {
-			auto pos = nodes_.find(proc_rec.ssn_);
-			if (pos != nodes_.end()) {
-				for (auto &&mq : pos->second->addrs_) {
-					if (mq.first == dest.id_) {
-						dest.offset_ = mq.second;
-						return true;
-					}
-				}
-			}
-			return false;
-		};
-		if (!FindMq()) { return; }
-
-		auto size = GetAllocSize((val >> 52) & MaskBits(8));
-		MsgI new_msg;
-		if (new_msg.Make(size)) {
-			// 31bit proc index, 28bit id, ,4bit cmd+flag
-			int64_t reply = (new_msg.Offset() << 32) | (msg_id << 4) | EncodeCmd(eCmdAllocReply0);
-			SendAllocReply(socket, dest, reply, new_msg);
-		} else {
-			int64_t reply = (msg_id << 4) | EncodeCmd(eCmdAllocReply0); // send empty, ack failure.
-			socket.Send(dest, reply);
-		}
-	}
-
-	void OnFree(ShmSocket &socket, const int64_t val)
-	{
-		int64_t msg_id = (val >> 4) & MaskBits(31);
-		msgs_.FreeMsg(msg_id);
-	}
-
-	bool OnCommand(ShmSocket &socket, const int64_t val)
-	{
-		assert(IsCmd(val));
-		int cmd = DecodeCmd(val);
-		switch (cmd) {
-		case eCmdAllocRequest0: OnAlloc(socket, val); break;
-		case eCmdFree: OnFree(socket, val); break;
-		default: return false;
-		}
-		return true;
-	}
-
-	MsgProcInitReply ProcInit(const BHMsgHead &head, MsgProcInit &msg)
-	{
-		LOG_DEBUG() << "center got proc init.";
-		auto pos = nodes_.find(head.ssn_id());
-		if (pos == nodes_.end()) {
-			return MakeReply<MsgProcInitReply>(eNotFound, "Node Not Initialised");
-		}
-		auto index = procs_.Put(head.proc_id(), head.ssn_id());
-		auto reply(MakeReply<MsgProcInitReply>(eSuccess));
-		reply.set_proc_index(index);
-
-		auto &node = pos->second;
-		try {
-			for (int i = 0; i < msg.extra_mq_num(); ++i) {
-				ShmSocket tmp(BHomeShm(), true, head.ssn_id() + i + 1, 16);
-				node->addrs_.emplace(tmp.id(), tmp.AbsAddr());
-				auto addr = reply.add_extra_mqs();
-				addr->set_mq_id(tmp.id());
-				addr->set_abs_addr(tmp.AbsAddr());
-			}
-			return reply;
-		} catch (...) {
-			LOG_ERROR() << "proc init create mq error";
-			return MakeReply<MsgProcInitReply>(eError, "Create mq failed.");
-		}
-	}
-
-	MsgCommonReply Register(const BHMsgHead &head, MsgRegister &msg)
-	{
-		if (msg.proc().proc_id() != head.proc_id()) {
-			return MakeReply(eInvalidInput, "invalid proc id.");
-		}
-
-		try {
-			MQId ssn = head.ssn_id();
-			// when node restart, ssn will change,
-			// and old node will be removed after timeout.
-			auto UpdateRegInfo = [&](Node &node) {
-				node->proc_.Swap(msg.mutable_proc());
-				node->state_.timestamp_ = head.timestamp();
-				node->state_.UpdateState(NowSec(), offline_time_, kill_time_);
-			};
-
-			auto pos = nodes_.find(ssn);
-			if (pos == nodes_.end()) {
-				return MakeReply(eInvalidInput, "invalid session.");
-			}
-
-			// update proc info
-			Node &node = pos->second;
-			UpdateRegInfo(node);
-			LOG_DEBUG() << "node (" << head.proc_id() << ") ssn (" << ssn << ")";
-
-			auto old = online_node_addr_map_.find(head.proc_id());
-			if (old != online_node_addr_map_.end()) { // old session
-				auto &old_ssn = old->second;
-				if (old_ssn != ssn) {
-					nodes_[old_ssn]->state_.PutOffline(offline_time_);
-					LOG_DEBUG() << "put node (" << nodes_[old_ssn]->proc_.proc_id() << ") ssn (" << old->second << ") offline";
-					old_ssn = ssn;
-				}
-			} else {
-				online_node_addr_map_.emplace(head.proc_id(), ssn);
-			}
-			return MakeReply(eSuccess);
-		} catch (...) {
-			return MakeReply(eError, "register node error.");
-		}
-	}
-
-	template <class Reply, class Func>
-	Reply HandleMsg(const BHMsgHead &head, Func const &op)
-	{
-		try {
-			auto pos = nodes_.find(head.ssn_id());
-			if (pos == nodes_.end()) {
-				return MakeReply<Reply>(eNotRegistered, "Node is not registered.");
-			} else {
-				auto &node = pos->second;
-				if (!MatchAddr(node->addrs_, SrcAddr(head))) {
-					return MakeReply<Reply>(eAddressNotMatch, "Node address error.");
-				} else if (head.type() == kMsgTypeHeartbeat && CanHeartbeat(*node)) {
-					return op(node);
-				} else if (!Valid(*node)) {
-					return MakeReply<Reply>(eNoRespond, "Node is not alive.");
-				} else {
-					return op(node);
-				}
-			}
-		} catch (...) {
-			//TODO error log
-			return MakeReply<Reply>(eError, "internal error.");
-		}
-	}
-	template <class Func>
-	inline MsgCommonReply HandleMsg(const BHMsgHead &head, Func const &op)
-	{
-		return HandleMsg<MsgCommonReply, Func>(head, op);
-	}
-
-	MsgCommonReply Unregister(const BHMsgHead &head, MsgUnregister &msg)
-	{
-		return HandleMsg(
-		    head, [&](Node node) -> MsgCommonReply {
-			    NodeInfo &ni = *node;
-			    ni.state_.PutOffline(offline_time_);
-			    return MakeReply(eSuccess);
-		    });
-	}
-
-	MsgCommonReply RegisterRPC(const BHMsgHead &head, MsgRegisterRPC &msg)
-	{
-		return HandleMsg(
-		    head, [&](Node node) -> MsgCommonReply {
-			    auto src = SrcAddr(head);
-			    auto &topics = msg.topics().topic_list();
-			    node->services_[src].insert(topics.begin(), topics.end());
-			    TopicDest dest = {src, SrcAbsAddr(head), node};
-			    for (auto &topic : topics) {
-				    service_map_[topic].insert(dest);
-			    }
-			    LOG_DEBUG() << "node " << node->proc_.proc_id() << " ssn " << node->addrs_.begin()->first << " serve " << topics.size() << " topics:\n";
-			    for (auto &topic : topics) {
-				    LOG_DEBUG() << "\t" << topic;
-			    }
-			    return MakeReply(eSuccess);
-		    });
-	}
-
-	MsgCommonReply Heartbeat(const BHMsgHead &head, const MsgHeartbeat &msg)
-	{
-		return HandleMsg(head, [&](Node node) {
-			NodeInfo &ni = *node;
-			ni.state_.timestamp_ = head.timestamp();
-			ni.state_.UpdateState(NowSec(), offline_time_, kill_time_);
-
-			auto &info = msg.proc();
-			if (!info.public_info().empty()) {
-				ni.proc_.set_public_info(info.public_info());
-			}
-			if (!info.private_info().empty()) {
-				ni.proc_.set_private_info(info.private_info());
-			}
-			return MakeReply(eSuccess);
-		});
-	}
-	MsgQueryProcReply QueryProc(const BHMsgHead &head, const MsgQueryProc &req)
-	{
-		typedef MsgQueryProcReply Reply;
-		auto query = [&](Node self) -> Reply {
-			auto Add1 = [](Reply &reply, Node node) {
-				auto info = reply.add_proc_list();
-				*info->mutable_proc() = node->proc_;
-				info->set_online(node->state_.flag_ == kStateNormal);
-				for (auto &addr_topics : node->services_) {
-					for (auto &topic : addr_topics.second) {
-						info->mutable_topics()->add_topic_list(topic);
-					}
-				}
-			};
-
-			if (!req.proc_id().empty()) {
-				auto pos = online_node_addr_map_.find(req.proc_id());
-				if (pos == online_node_addr_map_.end()) {
-					return MakeReply<Reply>(eNotFound, "proc not found.");
-				} else {
-					auto node_pos = nodes_.find(pos->second);
-					if (node_pos == nodes_.end()) {
-						return MakeReply<Reply>(eNotFound, "proc node not found.");
-					} else {
-						auto reply = MakeReply<Reply>(eSuccess);
-						Add1(reply, node_pos->second);
-						return reply;
-					}
-				}
-			} else {
-				Reply reply(MakeReply<Reply>(eSuccess));
-				for (auto &kv : nodes_) {
-					Add1(reply, kv.second);
-				}
-				return reply;
-			}
-		};
-
-		return HandleMsg<Reply>(head, query);
-	}
-
-	MsgQueryTopicReply QueryTopic(const BHMsgHead &head, const MsgQueryTopic &req)
-	{
-		typedef MsgQueryTopicReply Reply;
-
-		auto query = [&](Node self) -> Reply {
-			auto pos = service_map_.find(req.topic());
-			if (pos != service_map_.end() && !pos->second.empty()) {
-				auto &clients = pos->second;
-				Reply reply = MakeReply<Reply>(eSuccess);
-				for (auto &dest : clients) {
-					Node dest_node(dest.weak_node_.lock());
-					if (dest_node && Valid(*dest_node)) {
-						auto node_addr = reply.add_node_address();
-						node_addr->set_proc_id(dest_node->proc_.proc_id());
-						node_addr->mutable_addr()->set_mq_id(dest.mq_id_);
-						node_addr->mutable_addr()->set_abs_addr(dest.mq_abs_addr_);
-					}
-				}
-				return reply;
-			} else {
-				return MakeReply<Reply>(eNotFound, "topic server not found.");
-			}
-		};
-
-		return HandleMsg<Reply>(head, query);
-	}
-
-	MsgCommonReply Subscribe(const BHMsgHead &head, const MsgSubscribe &msg)
-	{
-		return HandleMsg(head, [&](Node node) {
-			auto src = SrcAddr(head);
-			auto &topics = msg.topics().topic_list();
-			node->subscriptions_[src].insert(topics.begin(), topics.end());
-			TopicDest dest = {src, SrcAbsAddr(head), node};
-			for (auto &topic : topics) {
-				subscribe_map_[topic].insert(dest);
-			}
-			return MakeReply(eSuccess);
-		});
-	}
-	MsgCommonReply Unsubscribe(const BHMsgHead &head, const MsgUnsubscribe &msg)
-	{
-		return HandleMsg(head, [&](Node node) {
-			auto src = SrcAddr(head);
-			auto pos = node->subscriptions_.find(src);
-
-			auto RemoveSubTopicDestRecord = [this](const Topic &topic, const TopicDest &dest) {
-				auto pos = subscribe_map_.find(topic);
-				if (pos != subscribe_map_.end() &&
-				    pos->second.erase(dest) != 0 &&
-				    pos->second.empty()) {
-					subscribe_map_.erase(pos);
-				}
-			};
-
-			if (pos != node->subscriptions_.end()) {
-				const TopicDest &dest = {src, SrcAbsAddr(head), node};
-				auto &topics = msg.topics().topic_list();
-				// clear node sub records;
-				for (auto &topic : topics) {
-					pos->second.erase(topic);
-					RemoveSubTopicDestRecord(topic, dest);
-				}
-				if (pos->second.empty()) {
-					node->subscriptions_.erase(pos);
-				}
-			}
-			return MakeReply(eSuccess);
-		});
-	}
-
-	Clients DoFindClients(const std::string &topic)
-	{
-		Clients dests;
-		auto Find1 = [&](const std::string &t) {
-			auto pos = subscribe_map_.find(topic);
-			if (pos != subscribe_map_.end()) {
-				auto &clients = pos->second;
-				for (auto &cli : clients) {
-					if (Valid(cli.weak_node_)) {
-						dests.insert(cli);
-					}
-				}
-			}
-		};
-		Find1(topic);
-
-		size_t pos = 0;
-		while (true) {
-			pos = topic.find(kTopicSep, pos);
-			if (pos == topic.npos || ++pos == topic.size()) {
-				// Find1(std::string()); // sub all.
-				break;
-			} else {
-				Find1(topic.substr(0, pos));
-			}
-		}
-		return dests;
-	}
-	bool FindClients(const BHMsgHead &head, const MsgPublish &msg, Clients &out, MsgCommonReply &reply)
-	{
-		bool ret = false;
-		HandleMsg(head, [&](Node node) {
-			DoFindClients(msg.topic()).swap(out);
-			ret = true;
-			return MakeReply(eSuccess);
-		}).Swap(&reply);
-		return ret;
-	}
-
-	void OnTimer()
-	{
-		CheckNodes();
-		msgs_.AutoRemove();
-	}
-
-private:
-	void CheckNodes()
-	{
-		auto now = NowSec();
-		if (now <= last_check_time_) { return; }
-		last_check_time_ = now;
-
-		auto it = nodes_.begin();
-		while (it != nodes_.end()) {
-			auto &cli = *it->second;
-			cli.state_.UpdateState(now, offline_time_, kill_time_);
-			if (cli.state_.flag_ == kStateKillme) {
-				RemoveNode(it->second);
-				it = nodes_.erase(it);
-			} else {
-				++it;
-			}
-		}
-		msgs_.DebugPrint();
-	}
-	bool CanHeartbeat(const NodeInfo &node)
-	{
-		return Valid(node) || node.state_.flag_ == kStateOffline;
-	}
-	bool Valid(const NodeInfo &node)
-	{
-		return node.state_.flag_ == kStateNormal;
-	}
-	bool Valid(const WeakNode &weak)
-	{
-		auto node = weak.lock();
-		return node && Valid(*node);
-	}
-	void RemoveNode(Node &node)
-	{
-		auto EraseMapRec = [&node](auto &rec_map, auto &node_rec) {
-			for (auto &addr_topics : node_rec) {
-				TopicDest dest{addr_topics.first, 0, node}; // abs_addr is not used.
-				for (auto &topic : addr_topics.second) {
-					auto pos = rec_map.find(topic);
-					if (pos != rec_map.end()) {
-						pos->second.erase(dest);
-						if (pos->second.empty()) {
-							rec_map.erase(pos);
-						}
-					}
-				}
-			}
-		};
-		EraseMapRec(service_map_, node->services_);
-		EraseMapRec(subscribe_map_, node->subscriptions_);
-
-		// remove online record.
-		auto pos = online_node_addr_map_.find(node->proc_.proc_id());
-		if (pos != online_node_addr_map_.end()) {
-			if (node->addrs_.find(pos->second) != node->addrs_.end()) {
-				online_node_addr_map_.erase(pos);
-			}
-		}
-
-		for (auto &addr : node->addrs_) {
-			cleaner_(addr.first);
-		}
-
-		node->addrs_.clear();
-	}
-	std::string id_; // center proc id;
-
-	std::unordered_map<Topic, Clients> service_map_;
-	std::unordered_map<Topic, Clients> subscribe_map_;
-	std::unordered_map<Address, Node> nodes_;
-	std::unordered_map<ProcId, Address> online_node_addr_map_;
-	ProcRecords procs_; // To get a short index for msg alloc.
-	MsgRecords msgs_;   // record all msgs alloced.
-
-	Cleaner cleaner_; // remove mqs.
-	int64_t offline_time_;
-	int64_t kill_time_;
-	int64_t last_check_time_;
-};
-
 template <class Body, class OnMsg, class Replyer>
 inline void Dispatch(MsgI &msg, BHMsgHead &head, OnMsg const &onmsg, Replyer const &replyer)
 {
@@ -725,18 +41,6 @@
 	if (msg.ParseBody(body)) {
 		replyer(onmsg(body));
 	}
-}
-
-Handler Combine(const Handler &h1, const Handler &h2)
-{
-	return [h1, h2](ShmSocket &socket, bhome_msg::MsgI &msg, bhome_msg::BHMsgHead &head) {
-		return h1(socket, msg, head) || h2(socket, msg, head);
-	};
-}
-template <class... H>
-Handler Combine(const Handler &h0, const Handler &h1, const Handler &h2, const H &...rest)
-{
-	return Combine(Combine(h0, h1), h2, rest...);
 }
 
 #define CASE_ON_MSG_TYPE(MsgTag)                                                         \
@@ -750,7 +54,7 @@
 	return [&](auto &&rep_body) {
 		auto reply_head(InitMsgHead(GetType(rep_body), center->id(), head.ssn_id(), head.msg_id()));
 		MQInfo remote = {head.route(0).mq_id(), head.route(0).abs_addr()};
-		MsgI msg;
+		MsgI msg(socket.shm());
 		if (msg.Make(reply_head, rep_body)) {
 			DEFER1(msg.Release(););
 			center->SendAllocMsg(socket, remote, msg);
@@ -758,7 +62,7 @@
 	};
 }
 
-bool AddCenter(std::shared_ptr<Synced<NodeCenter>> center_ptr)
+bool AddCenter(std::shared_ptr<Synced<NodeCenter>> center_ptr, SharedMemory &shm, TcpProxy &tcp_proxy)
 {
 	// command
 	auto OnCommand = [center_ptr](ShmSocket &socket, ShmMsgQueue::RawData &cmd) -> bool {
@@ -772,13 +76,49 @@
 		auto onInit = [&](const int64_t request) {
 			return center->OnNodeInit(socket, request);
 		};
-		BHCenterHandleInit(onInit);
+		BHCenterHandleInit(socket.shm(), onInit);
 		center->OnTimer();
 	};
 
-	auto OnCenter = [=](ShmSocket &socket, MsgI &msg, BHMsgHead &head) -> bool {
+	auto OnCenter = [=, &tcp_proxy](ShmSocket &socket, MsgI &msg, BHMsgHead &head) -> bool {
 		auto &center = *center_ptr;
 		auto replyer = MakeReplyer(socket, head, center);
+
+		if (!head.dest().ip().empty()) { // other host, proxy
+			auto valid = [&]() { return head.route_size() == 1; };
+			if (!valid()) { return false; }
+
+			if (head.type() == kMsgTypeRequestTopic) {
+				typedef MsgRequestTopicReply Reply;
+				Reply reply;
+				if (!center->CheckMsg(head, reply)) {
+					replyer(reply);
+				} else {
+					auto onResult = [&center](BHMsgHead &head, std::string body_content) {
+						if (head.route_size() > 0) {
+							auto &back = head.route(head.route_size() - 1);
+							MQInfo dest = {back.mq_id(), back.abs_addr()};
+							head.mutable_route()->RemoveLast();
+							center->PassRemoteReplyToLocal(dest, head, std::move(body_content));
+						}
+					};
+					uint16_t port = head.dest().port();
+					if (port == 0) {
+						port = kBHCenterPort;
+					}
+					if (!tcp_proxy.Request(head.dest().ip(), port, msg.content(), onResult)) {
+						replyer(MakeReply<Reply>(eError, "send request failed."));
+					} else {
+						// success
+					}
+				}
+				return true;
+			} else {
+				// ignore other msgs for now.
+			}
+			return false;
+		}
+
 		switch (head.type()) {
 			CASE_ON_MSG_TYPE(ProcInit);
 			CASE_ON_MSG_TYPE(Register);
@@ -791,38 +131,23 @@
 		default: return false;
 		}
 	};
-	BHCenter::Install("#center.main", OnCenter, OnCommand, OnCenterIdle, BHTopicCenterAddress(), 1000);
+	BHCenter::Install("@center.main", OnCenter, OnCommand, OnCenterIdle, BHTopicCenterAddress(shm), 1000);
 
 	auto OnBusIdle = [=](ShmSocket &socket) {};
 	auto OnBusCmd = [=](ShmSocket &socket, ShmMsgQueue::RawData &val) { return false; };
-	auto OnPubSub = [=](ShmSocket &socket, MsgI &msg, BHMsgHead &head) -> bool {
+	auto OnPubSub = [=, &tcp_proxy](ShmSocket &socket, MsgI &msg, BHMsgHead &head) -> bool {
 		auto &center = *center_ptr;
 		auto replyer = MakeReplyer(socket, head, center);
 		auto OnPublish = [&]() {
 			MsgPublish pub;
-			NodeCenter::Clients clients;
-			MsgCommonReply reply;
-			if (head.route_size() != 1 || !msg.ParseBody(pub)) {
-				return;
-			} else if (!center->FindClients(head, pub, clients, reply)) {
+			if (head.route_size() == 1 && msg.ParseBody(pub)) {
+				// replyer(center->Publish(head, pub.topic(), msg)); // dead lock?
+				auto reply(center->Publish(head, pub.topic(), msg));
 				replyer(reply);
-			} else {
-				replyer(MakeReply(eSuccess));
-				if (clients.empty()) { return; }
-
-				auto it = clients.begin();
-				do {
-					auto &cli = *it;
-					auto node = cli.weak_node_.lock();
-					if (node) {
-						// should also make sure that mq is not killed before msg expires.
-						// it would be ok if (kill_time - offline_time) is longer than expire time.
-						socket.Send({cli.mq_id_, cli.mq_abs_addr_}, msg);
-						++it;
-					} else {
-						it = clients.erase(it);
-					}
-				} while (it != clients.end());
+				auto hosts = center->FindRemoteSubClients(pub.topic());
+				for (auto &host : hosts) {
+					tcp_proxy.Publish(host, kBHCenterPort, msg.content());
+				}
 			}
 		};
 		switch (head.type()) {
@@ -833,7 +158,7 @@
 		}
 	};
 
-	BHCenter::Install("#center.bus", OnPubSub, OnBusCmd, OnBusIdle, BHTopicBusAddress(), 1000);
+	BHCenter::Install("@center.bus", OnPubSub, OnBusCmd, OnBusIdle, BHTopicBusAddress(shm), 1000);
 
 	return true;
 }
@@ -856,22 +181,23 @@
 
 BHCenter::BHCenter(Socket::Shm &shm)
 {
-	auto gc = [&](const MQId id) {
-		auto r = ShmSocket::Remove(shm, id);
-		if (r) {
-			LOG_DEBUG() << "remove mq " << id << " ok\n";
-		}
-	};
+	auto nsec = NodeTimeoutSec();
+	auto center_ptr = std::make_shared<Synced<NodeCenter>>("@bhome_center", nsec, nsec * 3); // *3 to allow other clients to finish sending msgs.
+	io_service_.reset(new IoService);
+	tcp_proxy_.reset(new TcpProxy(io_service_->io()));
 
-	auto nsec = seconds(NodeTimeoutSec());
-	auto center_ptr = std::make_shared<Synced<NodeCenter>>("#bhome_center", gc, nsec, nsec * 3); // *3 to allow other clients to finish sending msgs.
-	AddCenter(center_ptr);
+	AddCenter(center_ptr, shm, *tcp_proxy_);
 
 	for (auto &kv : Centers()) {
 		auto &info = kv.second;
 		sockets_[info.name_] = std::make_shared<ShmSocket>(info.mq_.offset_, shm, info.mq_.id_);
 	}
+
+	topic_node_.reset(new CenterTopicNode(center_ptr, shm));
+	tcp_server_.reset(new TcpServer(io_service_->io(), kBHCenterPort, center_ptr));
 }
+
+BHCenter::~BHCenter() { Stop(); }
 
 bool BHCenter::Start()
 {
@@ -879,12 +205,16 @@
 		auto &info = kv.second;
 		sockets_[info.name_]->Start(1, info.handler_, info.raw_handler_, info.idle_);
 	}
-
+	topic_node_->Start();
 	return true;
 }
 
 bool BHCenter::Stop()
 {
+	tcp_proxy_.reset();
+	tcp_server_.reset();
+	io_service_.reset();
+	topic_node_->Stop();
 	for (auto &kv : sockets_) {
 		kv.second->Stop();
 	}

--
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