5bdd09d08a
Since we don't support Ubuntu 14.04 anymore, we can drop Upstart related code from supervisor.[cc|hh]. Also, "#ifdef HAVE_LIBSYSTEMD" was for compiling Scylla on older distribution which does not provide libsystemd, we nolonger need this since we always build Scylla on latest Fedora. Dropping HAVE_LIBSYSTEMD also means removing libsystemd from optional_packages in configure.py, make it required library. Note that we still may run Scylla without systemd such as our Docker image, but sd_notify() does nothing when systemd does not detected, so we can ignore such case. Reference: https://www.freedesktop.org/software/systemd/man/sd_notify.html Reference: https://github.com/systemd/systemd/blob/master/src/libsystemd/sd-daemon/sd-daemon.c
57 lines
1.8 KiB
C++
57 lines
1.8 KiB
C++
/*
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* Copyright (C) 2017 ScyllaDB
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*/
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/*
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* This file is part of Scylla.
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*
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* Scylla is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Affero General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* Scylla is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with Scylla. If not, see <http://www.gnu.org/licenses/>.
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*/
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#pragma once
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#include <seastar/core/sstring.hh>
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#include <seastar/core/print.hh>
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#include "seastarx.hh"
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#include <systemd/sd-daemon.h>
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#include "log.hh"
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extern logger startlog;
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class supervisor {
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public:
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static constexpr auto systemd_ready_msg = "READY=1";
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/** A systemd status message has a format <status message prefix>=<message> */
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static constexpr auto systemd_status_msg_prefix = "STATUS";
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public:
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/**
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* @brief Notify the Supervisor with the given message.
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* @param msg message to notify the Supervisor with
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* @param ready set to TRUE when scylla service becomes ready
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*/
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static inline void notify(sstring msg, bool ready = false) {
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startlog.info("{}", msg);
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try_notify_systemd(msg, ready);
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}
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private:
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static inline void try_notify_systemd(sstring msg, bool ready) {
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if (ready) {
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sd_notify(0, format("{}\n{}={}\n", systemd_ready_msg, systemd_status_msg_prefix, msg).c_str());
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} else {
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sd_notify(0, format("{}={}\n", systemd_status_msg_prefix, msg).c_str());
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}
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}
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};
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