/*
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* =====================================================================================
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*
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* Filename: node_center.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05月20日 11时32分55秒
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* Revision: none
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* Compiler: gcc
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*
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* Author: Li Chao (), lichao@aiotlink.com
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* Organization:
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*
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* =====================================================================================
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*/
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#include "node_center.h"
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#include "json.h"
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#include "log.h"
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using ssjson::Json;
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namespace
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{
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std::string Join(const std::string &parent, const std::string &child)
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{
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return parent + kTopicSep + child;
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}
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const std::string kTopicCenterRoot = "#center";
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const std::string kTopicNode = Join(kTopicCenterRoot, "node");
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const std::string kTopicNodeOnline = Join(kTopicNode, "online");
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const std::string kTopicNodeOffline = Join(kTopicNode, "offline");
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} // namespace
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ProcIndex ProcRecords::Put(const ProcId &proc_id, const MQId ssn)
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{
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if (procs_.size() >= kMaxProcs) {
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return -1;
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}
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auto pos_isnew = proc_index_.emplace(proc_id, procs_.size());
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int index = pos_isnew.first->second;
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if (pos_isnew.second) {
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procs_.emplace_back(ProcRec{proc_id, ssn});
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} else { // update ssn
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procs_[index].ssn_ = ssn;
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}
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return index;
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}
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const ProcRecords::ProcRec &ProcRecords::Get(const ProcIndex index) const
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{
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static ProcRec empty_rec;
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return (index < procs_.size()) ? procs_[index] : empty_rec;
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}
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void MsgRecords::FreeMsg(MsgId id)
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{
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auto pos = msgs_.find(id);
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if (pos != msgs_.end()) {
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ShmMsg(pos->second).Free();
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msgs_.erase(pos);
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} else {
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LOG_TRACE() << "ignore late free request.";
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}
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}
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void MsgRecords::AutoRemove()
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{
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auto now = NowSec();
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if (now < time_to_clean_) {
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return;
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}
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// LOG_FUNCTION;
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time_to_clean_ = now + 1;
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int64_t limit = std::max(10000ul, msgs_.size() / 10);
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int64_t n = 0;
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auto it = msgs_.begin();
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while (it != msgs_.end() && --limit > 0) {
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ShmMsg msg(it->second);
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auto Free = [&]() {
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msg.Free();
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it = msgs_.erase(it);
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++n;
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};
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int n = now - msg.timestamp();
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if (n < 10) {
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++it;
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} else if (msg.Count() == 0) {
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Free();
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} else if (n > 60) {
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Free();
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}
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}
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if (n > 0) {
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LOG_DEBUG() << "~~~~~~~~~~~~~~~~ auto release msgs: " << n;
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}
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}
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void MsgRecords::DebugPrint() const
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{
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LOG_TRACE() << "msgs : " << size();
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int i = 0;
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int total_count = 0;
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for (auto &kv : msgs_) {
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MsgI msg(kv.second);
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total_count += msg.Count();
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LOG_TRACE() << " " << i++ << ": msg id: " << kv.first << ", offset: " << kv.second << ", count: " << msg.Count() << ", size: " << msg.Size();
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}
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LOG_TRACE() << "total count: " << total_count;
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}
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// NodeCenter::ProcState
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void NodeCenter::NodeInfo::PutOffline(const int64_t offline_time)
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{
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state_.timestamp_ = NowSec() - offline_time;
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state_.flag_ = kStateOffline;
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Json json;
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json.put("proc_id", proc_.proc_id());
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center_.Publish(kTopicNodeOffline, json.dump());
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}
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void NodeCenter::NodeInfo::UpdateState(const int64_t now, const int64_t offline_time, const int64_t kill_time)
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{
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auto old = state_.flag_;
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auto diff = now - state_.timestamp_;
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auto publish = [this](const std::string &topic) {
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if (proc_.proc_id().empty()) { return; } // node init, ignore.
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Json json;
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json.put("proc_id", proc_.proc_id());
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center_.Publish(topic, json.dump());
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};
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LOG_TRACE() << "node " << proc_.proc_id() << " timeout count: " << diff;
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if (diff < offline_time) {
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state_.flag_ = kStateNormal;
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if (old != state_.flag_) {
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publish(kTopicNodeOnline);
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}
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} else if (diff < kill_time) {
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state_.flag_ = kStateOffline;
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if (old != state_.flag_) {
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publish(kTopicNodeOffline);
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}
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} else {
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state_.flag_ = kStateKillme;
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}
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}
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int64_t NodeCenter::OnNodeInit(ShmSocket &socket, const int64_t val)
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{
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LOG_FUNCTION;
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SharedMemory &shm = socket.shm();
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MQId ssn = (val >> 4) & MaskBits(56);
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int reply = EncodeCmd(eCmdNodeInitReply);
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if (nodes_.find(ssn) != nodes_.end()) {
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return reply; // ignore if exists.
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}
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auto UpdateRegInfo = [&](Node &node) {
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node->state_.timestamp_ = NowSec() - offline_time_;
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node->UpdateState(NowSec(), offline_time_, kill_time_);
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// create sockets.
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try {
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ShmSocket tmp(shm, true, ssn, 16);
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node->addrs_.emplace(ssn, tmp.AbsAddr());
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return true;
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} catch (...) {
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return false;
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}
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};
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auto PrepareProcInit = [&](Node &node) {
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bool r = false;
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ShmMsg init_msg;
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DEFER1(init_msg.Release());
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MsgProcInit body;
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auto head = InitMsgHead(GetType(body), id(), ssn);
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return init_msg.Make(GetAllocSize(CalcAllocIndex(900))) &&
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init_msg.Fill(ShmMsg::Serialize(head, body)) &&
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SendAllocMsg(socket, {ssn, node->addrs_[ssn]}, init_msg);
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};
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Node node(new NodeInfo(*this));
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if (UpdateRegInfo(node) && PrepareProcInit(node)) {
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reply |= (node->addrs_[ssn] << 4);
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nodes_[ssn] = node;
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LOG_INFO() << "new node ssn (" << ssn << ") init";
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} else {
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ShmSocket::Remove(shm, ssn);
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}
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return reply;
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}
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void NodeCenter::RecordMsg(const MsgI &msg)
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{
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msg.reset_managed(true);
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msgs_.RecordMsg(msg);
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}
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bool NodeCenter::SendAllocReply(ShmSocket &socket, const MQInfo &dest, const int64_t reply, const MsgI &msg)
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{
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RecordMsg(msg);
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auto onExpireFree = [this, msg](const SendQ::Data &) { msgs_.FreeMsg(msg.id()); };
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return socket.Send(dest, reply, onExpireFree);
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}
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bool NodeCenter::SendAllocMsg(ShmSocket &socket, const MQInfo &dest, const MsgI &msg)
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{
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RecordMsg(msg);
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return socket.Send(dest, msg);
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}
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void NodeCenter::OnAlloc(ShmSocket &socket, const int64_t val)
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{
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// LOG_FUNCTION;
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// 8bit size, 4bit socket index, 16bit proc index, 28bit id, ,4bit cmd+flag
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int64_t msg_id = (val >> 4) & MaskBits(28);
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int proc_index = (val >> 32) & MaskBits(16);
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int socket_index = ((val) >> 48) & MaskBits(4);
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auto proc_rec(procs_.Get(proc_index));
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if (proc_rec.proc_.empty()) {
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return;
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}
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MQInfo dest = {proc_rec.ssn_ + socket_index, 0};
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auto FindMq = [&]() {
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auto pos = nodes_.find(proc_rec.ssn_);
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if (pos != nodes_.end()) {
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for (auto &&mq : pos->second->addrs_) {
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if (mq.first == dest.id_) {
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dest.offset_ = mq.second;
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return true;
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}
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}
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}
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return false;
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};
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if (!FindMq()) { return; }
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auto size = GetAllocSize((val >> 52) & MaskBits(8));
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MsgI new_msg;
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if (new_msg.Make(size)) {
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// 31bit proc index, 28bit id, ,4bit cmd+flag
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int64_t reply = (new_msg.Offset() << 32) | (msg_id << 4) | EncodeCmd(eCmdAllocReply0);
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SendAllocReply(socket, dest, reply, new_msg);
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} else {
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int64_t reply = (msg_id << 4) | EncodeCmd(eCmdAllocReply0); // send empty, ack failure.
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socket.Send(dest, reply);
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}
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}
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void NodeCenter::OnFree(ShmSocket &socket, const int64_t val)
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{
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int64_t msg_id = (val >> 4) & MaskBits(31);
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msgs_.FreeMsg(msg_id);
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}
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bool NodeCenter::OnCommand(ShmSocket &socket, const int64_t val)
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{
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assert(IsCmd(val));
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int cmd = DecodeCmd(val);
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switch (cmd) {
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case eCmdAllocRequest0: OnAlloc(socket, val); break;
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case eCmdFree: OnFree(socket, val); break;
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default: return false;
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}
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return true;
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}
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MsgProcInitReply NodeCenter::ProcInit(const BHMsgHead &head, MsgProcInit &msg)
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{
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LOG_DEBUG() << "center got proc init.";
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auto pos = nodes_.find(head.ssn_id());
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if (pos == nodes_.end()) {
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return MakeReply<MsgProcInitReply>(eNotFound, "Node Not Initialised");
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}
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auto index = procs_.Put(head.proc_id(), head.ssn_id());
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auto reply(MakeReply<MsgProcInitReply>(eSuccess));
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reply.set_proc_index(index);
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auto &node = pos->second;
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try {
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for (int i = 0; i < msg.extra_mq_num(); ++i) {
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ShmSocket tmp(BHomeShm(), true, head.ssn_id() + i + 1, 16);
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node->addrs_.emplace(tmp.id(), tmp.AbsAddr());
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auto addr = reply.add_extra_mqs();
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addr->set_mq_id(tmp.id());
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addr->set_abs_addr(tmp.AbsAddr());
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}
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return reply;
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} catch (...) {
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LOG_ERROR() << "proc init create mq error";
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return MakeReply<MsgProcInitReply>(eError, "Create mq failed.");
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}
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}
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MsgCommonReply NodeCenter::Register(const BHMsgHead &head, MsgRegister &msg)
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{
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if (msg.proc().proc_id() != head.proc_id()) {
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return MakeReply(eInvalidInput, "invalid proc id.");
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}
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try {
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MQId ssn = head.ssn_id();
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// when node restart, ssn will change,
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// and old node will be removed after timeout.
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auto pos = nodes_.find(ssn);
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if (pos == nodes_.end()) {
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return MakeReply(eInvalidInput, "invalid session.");
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}
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// try to remove old session
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auto old = online_node_addr_map_.find(head.proc_id());
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if (old != online_node_addr_map_.end()) { // old session
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auto &old_ssn = old->second;
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if (old_ssn != ssn) {
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nodes_[old_ssn]->PutOffline(offline_time_);
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LOG_DEBUG() << "put node (" << nodes_[old_ssn]->proc_.proc_id() << ") ssn (" << old->second << ") offline";
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old_ssn = ssn;
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}
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} else {
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online_node_addr_map_.emplace(head.proc_id(), ssn);
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}
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// update proc info
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Node &node = pos->second;
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node->proc_.Swap(msg.mutable_proc());
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node->state_.timestamp_ = head.timestamp();
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node->UpdateState(NowSec(), offline_time_, kill_time_);
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LOG_DEBUG() << "node (" << head.proc_id() << ") ssn (" << ssn << ")";
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return MakeReply(eSuccess);
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} catch (...) {
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return MakeReply(eError, "register node error.");
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}
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}
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MsgCommonReply NodeCenter::Unregister(const BHMsgHead &head, MsgUnregister &msg)
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{
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return HandleMsg(
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head, [&](Node node) -> MsgCommonReply {
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NodeInfo &ni = *node;
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ni.PutOffline(offline_time_);
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return MakeReply(eSuccess);
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});
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}
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MsgCommonReply NodeCenter::RegisterRPC(const BHMsgHead &head, MsgRegisterRPC &msg)
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{
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return HandleMsg(
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head, [&](Node node) -> MsgCommonReply {
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auto src = SrcAddr(head);
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auto &topics = msg.topics().topic_list();
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node->services_[src].insert(topics.begin(), topics.end());
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TopicDest dest = {src, SrcAbsAddr(head), node};
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for (auto &topic : topics) {
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service_map_[topic].insert(dest);
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}
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LOG_DEBUG() << "node " << node->proc_.proc_id() << " ssn " << node->addrs_.begin()->first << " serve " << topics.size() << " topics:\n";
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for (auto &topic : topics) {
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LOG_DEBUG() << "\t" << topic;
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}
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return MakeReply(eSuccess);
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});
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}
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MsgCommonReply NodeCenter::Heartbeat(const BHMsgHead &head, const MsgHeartbeat &msg)
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{
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return HandleMsg(head, [&](Node node) {
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NodeInfo &ni = *node;
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ni.state_.timestamp_ = head.timestamp();
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ni.UpdateState(NowSec(), offline_time_, kill_time_);
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auto &info = msg.proc();
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if (!info.public_info().empty()) {
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ni.proc_.set_public_info(info.public_info());
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}
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if (!info.private_info().empty()) {
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ni.proc_.set_private_info(info.private_info());
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}
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return MakeReply(eSuccess);
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});
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}
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MsgQueryProcReply NodeCenter::QueryProc(const std::string &proc_id)
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{
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typedef MsgQueryProcReply Reply;
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auto Add1 = [](Reply &reply, Node node) {
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auto info = reply.add_proc_list();
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*info->mutable_proc() = node->proc_;
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info->mutable_proc()->clear_private_info();
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info->set_online(node->state_.flag_ == kStateNormal);
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for (auto &addr_topics : node->services_) {
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for (auto &topic : addr_topics.second) {
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info->mutable_topics()->add_topic_list(topic);
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}
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}
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};
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if (!proc_id.empty()) {
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auto pos = online_node_addr_map_.find(proc_id);
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if (pos == online_node_addr_map_.end()) {
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return MakeReply<Reply>(eNotFound, "proc not found.");
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} else {
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auto node_pos = nodes_.find(pos->second);
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if (node_pos == nodes_.end()) {
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return MakeReply<Reply>(eNotFound, "proc node not found.");
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} else {
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auto reply = MakeReply<Reply>(eSuccess);
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Add1(reply, node_pos->second);
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return reply;
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}
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}
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} else {
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Reply reply(MakeReply<Reply>(eSuccess));
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for (auto &kv : nodes_) {
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Add1(reply, kv.second);
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}
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return reply;
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}
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}
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MsgQueryProcReply NodeCenter::QueryProc(const BHMsgHead &head, const MsgQueryProc &req)
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{
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typedef MsgQueryProcReply Reply;
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auto query = [&](Node self) -> Reply { return this->QueryProc(req.proc_id()); };
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return HandleMsg<Reply>(head, query);
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}
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MsgQueryTopicReply NodeCenter::QueryTopic(const BHMsgHead &head, const MsgQueryTopic &req)
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{
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typedef MsgQueryTopicReply Reply;
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auto query = [&](Node self) -> Reply {
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auto pos = service_map_.find(req.topic());
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if (pos != service_map_.end() && !pos->second.empty()) {
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auto &clients = pos->second;
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Reply reply = MakeReply<Reply>(eSuccess);
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for (auto &dest : clients) {
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Node dest_node(dest.weak_node_.lock());
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if (dest_node && Valid(*dest_node)) {
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auto node_addr = reply.add_node_address();
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node_addr->set_proc_id(dest_node->proc_.proc_id());
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node_addr->mutable_addr()->set_mq_id(dest.mq_id_);
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node_addr->mutable_addr()->set_abs_addr(dest.mq_abs_addr_);
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}
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}
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return reply;
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} else {
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return MakeReply<Reply>(eNotFound, "topic server not found.");
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}
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};
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return HandleMsg<Reply>(head, query);
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}
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MsgCommonReply NodeCenter::Subscribe(const BHMsgHead &head, const MsgSubscribe &msg)
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{
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return HandleMsg(head, [&](Node node) {
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auto src = SrcAddr(head);
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auto &topics = msg.topics().topic_list();
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node->subscriptions_[src].insert(topics.begin(), topics.end());
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TopicDest dest = {src, SrcAbsAddr(head), node};
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for (auto &topic : topics) {
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subscribe_map_[topic].insert(dest);
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}
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return MakeReply(eSuccess);
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});
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}
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MsgCommonReply NodeCenter::Unsubscribe(const BHMsgHead &head, const MsgUnsubscribe &msg)
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{
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return HandleMsg(head, [&](Node node) {
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auto src = SrcAddr(head);
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auto pos = node->subscriptions_.find(src);
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auto RemoveSubTopicDestRecord = [this](const Topic &topic, const TopicDest &dest) {
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auto pos = subscribe_map_.find(topic);
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if (pos != subscribe_map_.end() &&
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pos->second.erase(dest) != 0 &&
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pos->second.empty()) {
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subscribe_map_.erase(pos);
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}
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};
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if (pos != node->subscriptions_.end()) {
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const TopicDest &dest = {src, SrcAbsAddr(head), node};
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auto &topics = msg.topics().topic_list();
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// clear node sub records;
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for (auto &topic : topics) {
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pos->second.erase(topic);
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RemoveSubTopicDestRecord(topic, dest);
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}
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if (pos->second.empty()) {
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node->subscriptions_.erase(pos);
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}
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}
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return MakeReply(eSuccess);
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});
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}
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NodeCenter::Clients NodeCenter::DoFindClients(const std::string &topic)
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{
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Clients dests;
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auto Find1 = [&](const std::string &exact) {
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auto pos = subscribe_map_.find(exact);
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if (pos != subscribe_map_.end()) {
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auto &clients = pos->second;
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for (auto &cli : clients) {
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if (Valid(cli.weak_node_)) {
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dests.insert(cli);
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}
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}
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}
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};
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Find1(topic);
|
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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 - 1));
|
}
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}
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return dests;
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}
|
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bool NodeCenter::FindClients(const BHMsgHead &head, const MsgPublish &msg, Clients &out, MsgCommonReply &reply)
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{
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bool ret = false;
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HandleMsg(head, [&](Node node) {
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DoFindClients(msg.topic()).swap(out);
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ret = true;
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return MakeReply(eSuccess);
|
}).Swap(&reply);
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return ret;
|
}
|
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void NodeCenter::OnTimer()
|
{
|
CheckNodes();
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msgs_.AutoRemove();
|
}
|
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void NodeCenter::CheckNodes()
|
{
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auto now = NowSec();
|
if (now <= last_check_time_) { return; }
|
last_check_time_ = now;
|
|
auto it = nodes_.begin();
|
while (it != nodes_.end()) {
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auto &cli = *it->second;
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cli.UpdateState(now, offline_time_, kill_time_);
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if (cli.state_.flag_ == kStateKillme) {
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RemoveNode(it->second);
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it = nodes_.erase(it);
|
} else {
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++it;
|
}
|
}
|
msgs_.DebugPrint();
|
}
|
|
void NodeCenter::RemoveNode(Node &node)
|
{
|
auto EraseMapRec = [&node](auto &rec_map, auto &node_rec) {
|
for (auto &addr_topics : node_rec) {
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TopicDest dest{addr_topics.first, 0, node}; // abs_addr is not used.
|
for (auto &topic : addr_topics.second) {
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auto pos = rec_map.find(topic);
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if (pos != rec_map.end()) {
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pos->second.erase(dest);
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if (pos->second.empty()) {
|
rec_map.erase(pos);
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}
|
}
|
}
|
}
|
};
|
EraseMapRec(service_map_, node->services_);
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EraseMapRec(subscribe_map_, node->subscriptions_);
|
|
// remove online record.
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auto pos = online_node_addr_map_.find(node->proc_.proc_id());
|
if (pos != online_node_addr_map_.end()) {
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if (node->addrs_.find(pos->second) != node->addrs_.end()) {
|
online_node_addr_map_.erase(pos);
|
}
|
}
|
|
for (auto &addr : node->addrs_) {
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cleaner_(addr.first);
|
}
|
|
node->addrs_.clear();
|
}
|
|
void NodeCenter::Publish(const Topic &topic, const std::string &content)
|
{
|
try {
|
// LOG_DEBUG() << "center publish: " << topic << ": " << content;
|
Clients clients(DoFindClients(topic));
|
if (clients.empty()) { return; }
|
|
MsgPublish pub;
|
pub.set_topic(topic);
|
pub.set_data(content);
|
BHMsgHead head(InitMsgHead(GetType(pub), id(), 0));
|
MsgI msg;
|
if (msg.Make(head, pub)) {
|
DEFER1(msg.Release());
|
RecordMsg(msg);
|
|
auto &mq = GetCenterInfo(BHomeShm())->mq_sender_;
|
ShmSocket sender(mq.offset_, BHomeShm(), mq.id_);
|
|
for (auto &cli : clients) {
|
auto node = cli.weak_node_.lock();
|
if (node && node->state_.flag_ == kStateNormal) {
|
sender.Send({cli.mq_id_, cli.mq_abs_addr_}, msg);
|
}
|
}
|
}
|
|
} catch (...) {
|
LOG_ERROR() << "center publish error.";
|
}
|
}
|
