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ircd: Split runlevel related into header and unit.

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This commit is contained in:
Jason Volk 2018-12-08 15:15:31 -08:00
parent 6408ac4592
commit 0c0c3b1f41
5 changed files with 239 additions and 190 deletions
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57
include/ircd/ircd.h
View file

@ -16,10 +16,6 @@
namespace ircd
{
enum class runlevel :int;
extern const enum runlevel &runlevel;
extern bool debugmode; ///< Toggle; available only ifdef RB_DEBUG
extern bool nolisten; ///< Init option to not bind listener socks.
extern bool noautomod; ///< Option to not load modules on init.
@ -37,6 +33,7 @@ namespace ircd
#include "allocator.h"
#include "util/util.h"
#include "exception.h"
#include "runlevel.h"
#include "fpe.h"
#include "demangle.h"
#include "localee.h"
@ -82,61 +79,9 @@ namespace ircd
namespace ircd
{
struct init;
struct runlevel_changed;
string_view reflect(const enum runlevel &);
seconds uptime();
void init(boost::asio::io_context &ios, const string_view &origin, const string_view &hostname);
bool quit() noexcept;
}
/// An instance of this class registers itself to be called back when
/// the ircd::runlevel has changed.
///
/// Note: Its destructor will access a list in libircd; after a callback
/// for a HALT do not unload libircd.so until destructing this object.
///
/// A static ctx::dock is also available for contexts to wait for a runlevel
/// change notification.
///
struct ircd::runlevel_changed
:instance_list<ircd::runlevel_changed>
,std::function<void (const enum runlevel &)>
{
using handler = std::function<void (const enum runlevel &)>;
static ctx::dock dock;
runlevel_changed(handler function);
~runlevel_changed() noexcept;
};
/// The runlevel allows all observers to know the coarse state of IRCd and to
/// react accordingly. This can be used by the embedder of libircd to know
/// when it's safe to use or delete libircd resources. It is also used
/// similarly by the library and its modules.
///
/// Primary modes:
///
/// * HALT is the off mode. Nothing is/will be running in libircd until
/// an invocation of ircd::init();
///
/// * RUN is the service mode. Full client and application functionality
/// exists in this mode. Leaving the RUN mode is done with ircd::quit();
///
/// - Transitional modes: Modes which are working towards the next mode.
/// - Interventional modes: Modes which are *not* working towards the next
/// mode and may require some user action to continue.
///
enum class ircd::runlevel
:int
{
HALT = 0, ///< [inter] IRCd Powered off.
READY = 1, ///< [inter] Ready for user to run ios event loop.
START = 2, ///< [trans] Starting up subsystems for service.
RUN = 3, ///< [inter] IRCd in service.
QUIT = 4, ///< [trans] Clean shutdown in progress
FAULT = -1, ///< [trans] QUIT with exception (dirty shutdown)
};

81
include/ircd/runlevel.h Normal file
View file

@ -0,0 +1,81 @@
// 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.
#define HAVE_IRCD_IRCD_RUNLEVEL_H
namespace ircd
{
enum class runlevel :int;
struct runlevel_changed;
extern const enum runlevel &runlevel;
string_view reflect(const enum runlevel &);
bool runlevel_set(const enum runlevel &);
}
// Forward declarations for because ctx.h is included after runlevel.h.
namespace ircd::ctx
{
struct dock;
}
/// An instance of this class registers itself to be called back when
/// the ircd::runlevel has changed.
///
/// Note: Its destructor will access a list in libircd; after a callback
/// for a HALT do not unload libircd.so until destructing this object.
///
/// A static ctx::dock is also available for contexts to wait for a runlevel
/// change notification.
///
struct ircd::runlevel_changed
:instance_list<ircd::runlevel_changed>
,std::function<void (const enum runlevel &)>
{
using handler = std::function<void (const enum runlevel &)>;
// Users on an ircd::ctx who wish to use the dock interface to wait for
// a runlevel change can directly access this static instance.
static ctx::dock dock;
/// The handler function will be called back for any runlevel change while
/// this instance remains in scope.
runlevel_changed(handler function);
~runlevel_changed() noexcept;
};
/// The runlevel allows all observers to know the coarse state of IRCd and to
/// react accordingly. This can be used by the embedder of libircd to know
/// when it's safe to use or delete libircd resources. It is also used
/// similarly by the library and its modules.
///
/// Primary modes:
///
/// * HALT is the off mode. Nothing is/will be running in libircd until
/// an invocation of ircd::init();
///
/// * RUN is the service mode. Full client and application functionality
/// exists in this mode. Leaving the RUN mode is done with ircd::quit();
///
/// - Transitional modes: Modes which are working towards the next mode.
/// - Interventional modes: Modes which are *not* working towards the next
/// mode and may require some user action to continue.
///
enum class ircd::runlevel
:int
{
HALT = 0, ///< [inter] IRCd Powered off.
READY = 1, ///< [inter] Ready for user to run ios event loop.
START = 2, ///< [trans] Starting up subsystems for service.
RUN = 3, ///< [inter] IRCd in service.
QUIT = 4, ///< [trans] Clean shutdown in progress
FAULT = -1, ///< [trans] QUIT with exception (dirty shutdown)
};

1
ircd/Makefile.am
View file

@ -113,6 +113,7 @@ libircd_la_SOURCES = \
magic.cc \
fs.cc \
ctx.cc \
runlevel.cc \
rfc3986.cc \
rfc1035.cc \
demangle.cc \

140
ircd/ircd.cc
View file

@ -10,9 +10,6 @@
namespace ircd
{
enum runlevel _runlevel {runlevel::HALT}; // Current libircd runlevel
const enum runlevel &runlevel {_runlevel}; // Observer for current RL
bool debugmode; // meaningful ifdef RB_DEBUG
bool nolisten; // indicates no listener binding
bool noautomod; // no module loading on init
@ -26,7 +23,6 @@ namespace ircd
std::string _hostname; // user's supplied param
ctx::ctx *main_context; // Main program loop
bool set_runlevel(const enum runlevel &);
void main() noexcept;
}
@ -91,7 +87,7 @@ try
// Finally, without prior exception, the commitment to runlevel::READY
// is made here. The user can now invoke their ios.run(), or, if they
// have already, IRCd will begin main execution shortly...
ircd::set_runlevel(runlevel::READY);
ircd::runlevel_set(runlevel::READY);
}
catch(const std::exception &e)
{
@ -127,7 +123,7 @@ noexcept
{
ctx::terminate(*main_context);
main_context = nullptr;
ircd::set_runlevel(runlevel::HALT);
ircd::runlevel_set(runlevel::HALT);
return true;
}
@ -181,12 +177,12 @@ noexcept try
// transitions to HALT.
const unwind halted{[]
{
set_runlevel(runlevel::HALT);
runlevel_set(runlevel::HALT);
}};
// When this function is entered IRCd will transition to START indicating
// that subsystems are initializing.
ircd::set_runlevel(runlevel::START);
ircd::runlevel_set(runlevel::START);
// These objects are the init()'s and fini()'s for each subsystem.
// Appearing here ties their life to the main context. Initialization can
@ -225,11 +221,11 @@ noexcept try
// When the call to wait() below completes, IRCd exits from the RUN state.
const unwind nominal
{
std::bind(&ircd::set_runlevel, runlevel::QUIT)
std::bind(&ircd::runlevel_set, runlevel::QUIT)
};
// IRCd will now transition to the RUN state indicating full functionality.
ircd::set_runlevel(runlevel::RUN);
ircd::runlevel_set(runlevel::RUN);
// This call blocks until the main context is notified or interrupted etc.
// Waiting here will hold open this stack with all of the above objects
@ -258,127 +254,3 @@ ircd::uptime()
{
return seconds(ircd::time() - info::startup_time);
}
//
// runlevel
//
/// 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::set_runlevel(const enum runlevel &new_runlevel)
try
{
if(ircd::runlevel == new_runlevel)
return false;
log::debug
{
"IRCd runlevel transition from '%s' to '%s' (notifying %zu)",
reflect(ircd::runlevel),
reflect(new_runlevel),
runlevel_changed::list.size()
};
ircd::_runlevel = new_runlevel;
ircd::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)
ircd::log::fini();
else
ircd::log::flush();
for(const auto &handler : ircd::runlevel_changed::list)
(*handler)(new_runlevel);
if(latching)
latch.count_down();
}};
if(ircd::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 "??????";
}
//
// 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
{}

150
ircd/runlevel.cc Normal file
View file

@ -0,0 +1,150 @@
// 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 "??????";
}