/*
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* =====================================================================================
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*
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* Filename: reqrep.cpp
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*
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* Description: topic request/reply sockets
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*
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* Version: 1.0
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* Created: 2021年04月01日 09时35分35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 "reqrep.h"
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#include "msg.h"
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#include <chrono>
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#include <condition_variable>
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using namespace bhome_msg;
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bool SocketRequest::StartWorker(const RequestResultCB &rrcb, int nworker)
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{
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auto AsyncRecvProc = [this, rrcb](BHMsg &msg) {
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auto Find = [&](RecvCB &cb) {
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std::lock_guard<std::mutex> lock(mutex());
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const std::string &msgid = msg.msg_id();
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auto pos = async_cbs_.find(msgid);
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if (pos != async_cbs_.end()) {
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cb.swap(pos->second);
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async_cbs_.erase(pos);
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return true;
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} else {
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return false;
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}
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};
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RecvCB cb;
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if (Find(cb) && cb) {
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cb(msg);
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} else if (rrcb && msg.type() == kMsgTypeReply) {
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DataReply reply;
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if (reply.ParseFromString(msg.body())) {
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rrcb(reply.data());
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}
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} else {
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// ignored, or dropped
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}
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};
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return Start(AsyncRecvProc, nworker);
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}
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bool SocketRequest::AsyncRequest(const std::string &topic, const void *data, const size_t size, const int timeout_ms, const RequestResultCB &cb)
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{
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auto Call = [&](const void *remote) {
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const BHMsg &msg(MakeRequest(mq().Id(), topic, data, size));
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auto onRecv = [cb](BHMsg &msg) {
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if (msg.type() == kMsgTypeReply) {
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DataReply reply;
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if (reply.ParseFromString(msg.body())) {
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cb(reply.data());
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}
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}
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};
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return AsyncSend(remote, &msg, timeout_ms, onRecv);
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};
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try {
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BHAddress addr;
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if (QueryRPCTopic(topic, addr, timeout_ms)) {
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return Call(addr.mq_id().data());
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}
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} catch (...) {
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return false;
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}
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}
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bool SocketRequest::SyncRequest(const std::string &topic, const void *data, const size_t size, const int timeout_ms, std::string &out)
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{
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try {
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BHAddress addr;
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if (QueryRPCTopic(topic, addr, timeout_ms)) {
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const BHMsg &msg(MakeRequest(mq().Id(), topic, data, size));
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BHMsg reply;
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if (SyncSendAndRecv(addr.mq_id().data(), &msg, &reply, timeout_ms) && reply.type() == kMsgTypeReply) {
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DataReply dr;
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if (dr.ParseFromString(msg.body())) {
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dr.mutable_data()->swap(out);
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return true;
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}
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}
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}
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} catch (...) {
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return false;
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}
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}
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bool SocketRequest::AsyncSend(const void *remote, const void *pmsg, const int timeout_ms, const RecvCB &cb)
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{
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assert(remote && pmsg);
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try {
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const BHMsg &msg = *static_cast<const BHMsg *>(pmsg);
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auto RegisterCB = [&]() {
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std::lock_guard<std::mutex> lock(mutex());
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async_cbs_.emplace(msg.msg_id(), cb);
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};
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return mq().Send(*static_cast<const MQId *>(remote), msg, timeout_ms, RegisterCB);
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} catch (...) {
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return false;
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}
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}
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bool SocketRequest::SyncSendAndRecv(const void *remote, const void *msg, void *result, const int timeout_ms)
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{
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struct State {
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std::mutex mutex;
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std::condition_variable cv;
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bool canceled = false;
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};
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try {
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std::shared_ptr<State> st(new State);
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auto endtime = std::chrono::steady_clock::now() + std::chrono::milliseconds(timeout_ms);
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auto OnRecv = [=](BHMsg &msg) {
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std::unique_lock<std::mutex> lk(st->mutex);
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if (!st->canceled) {
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static_cast<BHMsg *>(result)->Swap(&msg);
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st->cv.notify_one();
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} // else result is no longer valid.
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};
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std::unique_lock<std::mutex> lk(st->mutex);
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if (AsyncSend(remote, msg, timeout_ms, OnRecv) && st->cv.wait_until(lk, endtime) == std::cv_status::no_timeout) {
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return true;
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} else {
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st->canceled = true;
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return false;
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}
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} catch (...) {
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return false;
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}
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}
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bool SocketRequest::QueryRPCTopic(const std::string &topic, bhome::msg::BHAddress &addr, const int timeout_ms)
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{
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BHMsg result;
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const BHMsg &msg = MakeQueryTopic(topic);
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if (SyncSendAndRecv(&kBHTopicRPCId, &msg, &result, timeout_ms)) {
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if (result.type() == kMsgTypeQueryTopicReply) {
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DataQueryTopicReply reply;
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if (reply.ParseFromString(result.body())) {
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addr = reply.address();
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return !addr.mq_id().empty();
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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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