Method ResolveA

library/cpp/dns/cache.cpp:94–130

    private:
        inline TResolvedHostPtr ResolveA(const TResolveTask& rt) {
            TString originalHost(rt.Info.Host);
            TString host(originalHost);

            //3. replace host to alias, if exist
            if (A_.size()) {
                TReadGuard guard(LA_);
                TString names[] = {"*", host};

                for (const auto& name : names) {
                    TAliases::const_iterator it = A_.find(name);

                    if (it != A_.end()) {
                        host = it->second;
                    }
                }
            }

            if (host.length() > 2 && host[0] == '[') {
                TString unbracedIpV6(host.data() + 1, host.size() - 2);
                host.swap(unbracedIpV6);
            }

            TAutoPtr<TNetworkAddress> na;

            //4. getaddrinfo (direct or in separate thread)
            if (rt.Method == TResolveTask::Normal) {
                na.Reset(new TNetworkAddress(host, rt.Info.Port));
            } else if (rt.Method == TResolveTask::Threaded) {
                na = ThreadedResolve(host, rt.Info.Port);
            } else {
                Y_ASSERT(0);
                throw yexception() << TStringBuf("invalid resolve method");
            }

            return new TResolvedHost(originalHost, *na);
        }

        typedef THashMap<TResolveInfo, TResolvedHostPtr, THashResolveInfo, TCompareResolveInfo> TCache;
        TCache C_;