Method get_from_pool

net/pooled_socket.cpp:139–148

    }

    ISocketStream* get_from_pool(const EndPoint& ep) {
        auto it = fdmap.find(ep);
        if (it == fdmap.end()) return nullptr;
        assert(it != fdmap.end());
        auto node = it->second.pop_front();
        rm_watch(node);
        DEFER(delete node);
        if (it->second.empty()) fdmap.erase(it);
        return node->stream.release();
    }

    void push_into_pool(StreamListNode* node) {
        fdmap[node->key].push_back(node);