int call()

in net/http/client.cpp [280:323]
44 lines of code
18 McCabe index (conditional complexity)

    int call(Operation* /*IN, OUT*/ op) override {
        auto content_length = op->req.headers.content_length();
        auto encoding = op->req.headers["Transfer-Encoding"];
        if ((content_length != 0) && (encoding == "chunked")) {
            op->status_code = -1;
            LOG_ERROR_RETURN(EINVAL, ROUNDTRIP_FAILED,
                            "Content-Length and Transfer-Encoding conflicted");
        }
        op->req.headers.merge(m_common_headers);
        op->req.headers.insert("User-Agent", m_user_agent.empty() ? std::string_view(USERAGENT)
                                                                  : std::string_view(m_user_agent));
        op->req.headers.insert("Connection", "keep-alive");
        if (m_cookie_jar && m_cookie_jar->set_cookies_to_headers(&op->req) != 0)
            LOG_ERROR_RETURN(0, -1, "set_cookies_to_headers failed");
        Timeout tmo(std::min(op->timeout.timeout(), m_timeout));
        int retry = 0, followed = 0, ret = 0;
        uint64_t sleep_interval = 0;
        while (followed <= op->follow && retry <= op->retry && tmo.timeout() != 0) {
            ret = do_roundtrip(op, tmo);
            if (ret == ROUNDTRIP_SUCCESS || ret == ROUNDTRIP_FAILED) break;
            switch (ret) {
                case ROUNDTRIP_NEED_RETRY:
                    photon::thread_usleep(sleep_interval * 1000UL);
                    sleep_interval = (sleep_interval + 500) * 2;
                    ++retry;
                    break;
                case ROUNDTRIP_FAST_RETRY:
                    ++retry;
                    break;
                case ROUNDTRIP_REDIRECT:
                    retry = 0;
                    ++followed;
                    break;
                default:
                    break;
            }
            if (tmo.timeout() == 0)
                LOG_ERROR_RETURN(ETIMEDOUT, -1, "connection timedout");
            if (followed > op->follow || retry > op->retry)
                LOG_ERRNO_RETURN(0, -1,  "connection failed");
        }
        if (ret != ROUNDTRIP_SUCCESS) LOG_ERROR_RETURN(0, -1,"too many retry, roundtrip failed");
        return 0;
    }