mirror of
https://github.com/matrix-construct/construct
synced 2024-12-28 08:24:08 +01:00
150 lines
3.2 KiB
C++
150 lines
3.2 KiB
C++
// Matrix Construct
|
|
//
|
|
// Copyright (C) Matrix Construct Developers, Authors & Contributors
|
|
// Copyright (C) 2016-2018 Jason Volk <jason@zemos.net>
|
|
//
|
|
// Permission to use, copy, modify, and/or distribute this software for any
|
|
// purpose with or without fee is hereby granted, provided that the above
|
|
// copyright notice and this permission notice is present in all copies. The
|
|
// full license for this software is available in the LICENSE file.
|
|
|
|
namespace ircd
|
|
{
|
|
static enum runlevel _runlevel;
|
|
}
|
|
|
|
decltype(ircd::runlevel)
|
|
ircd::runlevel
|
|
{
|
|
_runlevel
|
|
};
|
|
|
|
//
|
|
// runlevel_changed
|
|
//
|
|
|
|
template<>
|
|
decltype(ircd::runlevel_changed::list)
|
|
ircd::util::instance_list<ircd::runlevel_changed>::list
|
|
{};
|
|
|
|
decltype(ircd::runlevel_changed::dock)
|
|
ircd::runlevel_changed::dock;
|
|
|
|
//
|
|
// runlevel_changed::runlevel_changed
|
|
//
|
|
|
|
ircd::runlevel_changed::runlevel_changed(handler function)
|
|
:handler
|
|
{
|
|
std::move(function)
|
|
}
|
|
{
|
|
}
|
|
|
|
ircd::runlevel_changed::~runlevel_changed()
|
|
noexcept
|
|
{
|
|
}
|
|
|
|
//
|
|
// util
|
|
//
|
|
|
|
/// Sets the runlevel of IRCd and notifies users. This should never be called
|
|
/// manually/directly, as it doesn't trigger a runlevel change itself, it just
|
|
/// notifies of one.
|
|
///
|
|
/// The notification will be posted to the io_context. This is important to
|
|
/// prevent the callback from continuing execution on some ircd::ctx stack and
|
|
/// instead invoke their function on the main stack in their own io_context
|
|
/// event slice.
|
|
bool
|
|
ircd::runlevel_set(const enum runlevel &new_runlevel)
|
|
try
|
|
{
|
|
if(runlevel == new_runlevel)
|
|
return false;
|
|
|
|
log::debug
|
|
{
|
|
"IRCd runlevel transition from '%s' to '%s' (notifying %zu)",
|
|
reflect(runlevel),
|
|
reflect(new_runlevel),
|
|
runlevel_changed::list.size()
|
|
};
|
|
|
|
_runlevel = new_runlevel;
|
|
runlevel_changed::dock.notify_all();
|
|
|
|
// This latch is used to block this call when setting the runlevel
|
|
// from an ircd::ctx. If the runlevel is set from the main stack then
|
|
// the caller will have to do synchronization themselves.
|
|
ctx::latch latch
|
|
{
|
|
bool(ctx::current) // latch has count of 1 if we're on an ircd::ctx
|
|
};
|
|
|
|
// This function will notify the user of the change to IRCd. When there
|
|
// are listeners, function is posted to the io_context ensuring THERE IS
|
|
// NO CONTINUATION ON THIS STACK by the user.
|
|
const auto call_users{[new_runlevel, &latch, latching(!latch.is_ready())]
|
|
{
|
|
assert(new_runlevel == ircd::runlevel);
|
|
|
|
log::notice
|
|
{
|
|
"IRCd %s", reflect(new_runlevel)
|
|
};
|
|
|
|
if(new_runlevel == runlevel::HALT)
|
|
log::fini();
|
|
else
|
|
log::flush();
|
|
|
|
for(const auto &handler : runlevel_changed::list)
|
|
(*handler)(new_runlevel);
|
|
|
|
if(latching)
|
|
latch.count_down();
|
|
}};
|
|
|
|
if(runlevel_changed::list.size())
|
|
ircd::post(call_users);
|
|
else
|
|
call_users();
|
|
|
|
if(ctx::current)
|
|
latch.wait();
|
|
|
|
return true;
|
|
}
|
|
catch(const std::exception &e)
|
|
{
|
|
log::critical
|
|
{
|
|
"IRCd runlevel change to '%s': %s",
|
|
reflect(new_runlevel),
|
|
e.what()
|
|
};
|
|
|
|
ircd::terminate();
|
|
return false;
|
|
}
|
|
|
|
ircd::string_view
|
|
ircd::reflect(const enum runlevel &level)
|
|
{
|
|
switch(level)
|
|
{
|
|
case runlevel::HALT: return "HALT";
|
|
case runlevel::READY: return "READY";
|
|
case runlevel::START: return "START";
|
|
case runlevel::RUN: return "RUN";
|
|
case runlevel::QUIT: return "QUIT";
|
|
case runlevel::FAULT: return "FAULT";
|
|
}
|
|
|
|
return "??????";
|
|
}
|