mirror of
https://github.com/matrix-construct/construct
synced 2024-09-24 17:38:54 +02:00
ircd::run: Add another runlevel; eliminate main callback; simplify.
This commit is contained in:
Jason Volk
parent
dbb3c55db5
commit
e7c66d86d9
4 changed files with 118 additions and 160 deletions
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@ -36,7 +36,7 @@ bool write_avoid;
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bool soft_assert;
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bool nomatrix;
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const char *execute;
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std::array<bool, 6> smoketest;
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std::array<bool, 7> smoketest;
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lgetopt opts[]
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{
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@ -170,23 +170,6 @@ noexcept try
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}
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};
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// This is the sole io_context for Construct, and the ios.run() below is the
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// the only place where the program actually blocks.
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boost::asio::io_context ios;
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// libircd does no signal handling (or at least none that you ever have to
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// care about); reaction to all signals happens out here instead. Handling
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// is done properly through the io_context which registers the handler for
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// the platform and then safely posts the received signal to the io_context
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// event loop. This means we lose the true instant hardware-interrupt gratitude
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// of signals but with the benefit of unconditional safety and cross-
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// platformness with windows etc.
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const construct::signals signals{ios};
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// Associates libircd with our io_context and posts the initial routines
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// to that io_context. Execution of IRCd will then occur during ios::run()
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ircd::init(ios);
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// Setup synchronization primitives on this stack for starting and stopping
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// the application (matrix homeserver). Note this stack cannot actually use
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// these; they'll be used to synchronize the closures below running in
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@ -238,15 +221,15 @@ noexcept try
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// runlevel RUN. It is called again immediately after entering runlevel
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// QUIT, but before any functionality of libircd destructs. This cues us
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// to start and stop the homeserver.
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const decltype(ircd::run::main)::callback loader
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const ircd::run::changed loader
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{
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ircd::run::main, [&homeserver, &start, &quit]
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[&homeserver, &start, &quit](const auto &level)
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{
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static ircd::context context;
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// 2 This branch is taken the first time this function is called,
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// and not taken the second time.
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if(!context)
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if(level == ircd::run::level::IDLE && !context)
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{
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// 3 Launch the homeserver context (asynchronous).
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context = { "matrix", homeserver };
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@ -259,6 +242,9 @@ noexcept try
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return;
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}
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if(level != ircd::run::level::QUIT)
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return;
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// 11
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// Notify the waiting homeserver context to quit; this will
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// start shutting down the homeserver.
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@ -270,6 +256,23 @@ noexcept try
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}
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};
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// This is the sole io_context for Construct, and the ios.run() below is the
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// the only place where the program actually blocks.
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boost::asio::io_context ios;
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// libircd does no signal handling (or at least none that you ever have to
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// care about); reaction to all signals happens out here instead. Handling
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// is done properly through the io_context which registers the handler for
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// the platform and then safely posts the received signal to the io_context
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// event loop. This means we lose the true instant hardware-interrupt gratitude
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// of signals but with the benefit of unconditional safety and cross-
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// platformness with windows etc.
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const construct::signals signals{ios};
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// Associates libircd with our io_context and posts the initial routines
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// to that io_context. Execution of IRCd will then occur during ios::run()
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ircd::init(ios);
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// If the user wants to immediately drop to an interactive command line
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// without having to send a ctrl-c for it, that is provided here. This does
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// not actually take effect until it's processed in the ios.run() below.
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@ -30,40 +30,31 @@ namespace ircd::run
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// Access to the current runlevel indicator.
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extern const enum level &level;
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// Another callback list (albeit simply using util::callbacks) which is
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// called during level::START on the main context after all subsystems have
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// constructed, and again in level::QUIT before all subsystems have
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// destructed. The purpose here is to allow extensions to the START and
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// QUIT runlevels as if another subsystem was being listed in ircd::main().
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// These callbacks are intended to block the main context from moving to
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// the next runlevel until each one completes (run::changed doesn't quite
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// work this way).
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extern callbacks main;
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// Access to the desired runlevel. When this differs from the current
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// level, a command to change the runlevel has been given but not all
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// tasks have completed at the current runlevel.
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extern const enum level &chadburn;
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}
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/// An instance of this class registers itself to be called back when
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/// the ircd::run::level has changed.
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/// the ircd::run::level has changed. The context for this callback differs
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/// based on the level argument; not all invocations are on an ircd::ctx, etc.
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///
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/// Note: Its destructor will access a list in libircd; after a callback
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/// for a HALT do not unload libircd.so until destructing this object.
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///
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/// A static ctx::dock is also available for contexts to wait for a run::level
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/// change notification.
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///
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struct ircd::run::changed
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:instance_list<ircd::run::changed>
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,std::function<void (const enum level &)>
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{
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using handler = std::function<void (const enum level &)>;
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// Users on an ircd::ctx who wish to use the dock interface to wait for
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// a run::level change can directly access this static instance.
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static ctx::dock dock;
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handler function;
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/// The handler function will be called back for any run::level change while
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/// this instance remains in scope.
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changed(handler function);
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~changed() noexcept;
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changed(handler function) noexcept;
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};
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/// The run::level allows all observers to know the coarse state of IRCd and to
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@ -82,6 +73,9 @@ struct ircd::run::changed
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/// * START indicates the daemon is executing its startup procedures. Leaving
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/// the START state occurs internally when there is success or a fatal error.
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///
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/// * IDLE indicates the library is ready for use. The user can load their
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/// application in this mode before transitioning to RUN.
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///
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/// * RUN is the service mode. Full client and application functionality exists
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/// in this mode. Leaving the RUN mode is done with ircd::quit();
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///
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@ -94,10 +88,17 @@ struct ircd::run::changed
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enum class ircd::run::level
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:int
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{
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FAULT = -1, ///< Unrecoverable fault.
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HALT = 0, ///< x <-- IRCd Powered off.
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READY = 1, ///< | | Ready for user to run ios event loop.
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START = 2, ///< | | Starting up subsystems for service.
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RUN = 3, ///< O | IRCd in service.
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QUIT = 4, ///< --> ^ Clean shutdown in progress.
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FAULT = -1, ///< Unrecoverable fault.
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START = 2, ///< | | Starting internal subsystems.
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IDLE = 3, ///< | | Ready for user to load application.
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RUN = 4, ///< O | IRCd in service.
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QUIT = 5, ///< --> ^ Clean shutdown in progress.
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};
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inline
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ircd::run::changed::changed(handler function)
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noexcept
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:function(std::move(function))
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{}
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186
ircd/ircd.cc
186
ircd/ircd.cc
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@ -8,6 +8,13 @@
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// copyright notice and this permission notice is present in all copies. The
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// full license for this software is available in the LICENSE file.
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// internal interface to ircd::run (see ircd/run.h)
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namespace ircd::run
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{
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// change the current runlevel
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static bool set(const enum level &);
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}
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namespace ircd
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{
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// Fundamental context #1; all subsystems live as objects on this stack.
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@ -20,22 +27,6 @@ namespace ircd
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static void main() noexcept;
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}
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// internal interface to ircd::run (see ircd/run.h)
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namespace ircd::run
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{
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struct main_event;
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// change the current runlevel
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static bool set(const enum level &);
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}
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/// Placed on the main stack after all subsystems; this object represents
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/// a user's extension to the main stack via callbacks (see ircd/run.h)
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struct ircd::run::main_event
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{
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main_event(), ~main_event() noexcept;
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};
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decltype(ircd::version_api)
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ircd::version_api
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{
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@ -191,11 +182,11 @@ noexcept
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return true;
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}
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case run::level::IDLE:
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case run::level::START:
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{
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ctx::terminate(*main_context);
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main_context = nullptr;
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ircd::run::set(run::level::QUIT);
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return true;
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}
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@ -242,6 +233,7 @@ noexcept
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case run::level::QUIT:
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return;
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case run::level::IDLE:
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case run::level::RUN:
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break;
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}
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@ -301,10 +293,6 @@ noexcept try
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server::init _server_; // Server related
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client::init _client_; // Client related
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js::init _js_; // SpiderMonkey
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run::main_event _me_; // Additional user callbacks
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// IRCd will now transition to the RUN state indicating full functionality.
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run::set(run::level::RUN);
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// Transition to the QUIT state on unwind.
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const unwind quit{[]
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@ -312,13 +300,17 @@ noexcept try
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ircd::run::set(run::level::QUIT);
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}};
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// IRCd will now transition to the IDLE state allowing library user's to
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// load their applications using the run::changed callback.
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run::set(run::level::IDLE);
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// IRCd will now transition to the RUN state indicating full functionality.
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run::set(run::level::RUN);
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// This call blocks until the main context is notified or interrupted etc.
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// Waiting here will hold open this stack with all of the above objects
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// living on it.
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run::changed::dock.wait([]
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{
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return !main_context;
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});
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ctx::wait();
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}
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catch(const http::error &e) // <-- m::error
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{
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@ -360,7 +352,7 @@ ircd::uptime()
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namespace ircd::run
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{
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static enum level _level;
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static enum level _level, _chadburn;
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}
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decltype(ircd::run::level)
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@ -369,26 +361,11 @@ ircd::run::level
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_level
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};
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decltype(ircd::run::main)
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ircd::run::main;
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//
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// run::main_event
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//
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ircd::run::main_event::main_event()
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decltype(ircd::run::chadburn)
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ircd::run::chadburn
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{
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assert(level == level::START);
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run::main();
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}
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ircd::run::main_event::~main_event()
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noexcept
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{
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assert(level != level::RUN);
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assert(level == level::QUIT);
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run::main();
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}
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_chadburn
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};
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//
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// run::changed
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@ -409,23 +386,6 @@ ircd::util::instance_list<ircd::run::changed>::list
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decltype(ircd::run::changed::dock)
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ircd::run::changed::dock;
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//
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// run::changed::changed
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//
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ircd::run::changed::changed(handler function)
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:handler
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{
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std::move(function)
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}
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{
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}
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ircd::run::changed::~changed()
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noexcept
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{
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}
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/// The notification will be posted to the io_context. This is important to
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/// prevent the callback from continuing execution on some ircd::ctx stack and
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/// instead invoke their function on the main stack in their own io_context
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@ -434,72 +394,65 @@ bool
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ircd::run::set(const enum level &new_level)
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try
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{
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if(level == new_level)
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if(new_level == chadburn)
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return false;
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log::debug
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{
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"IRCd level transition from '%s' to '%s' (notifying %zu)",
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reflect(level),
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reflect(new_level),
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changed::list.size()
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};
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_level = new_level;
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// This latch is used to block this call when setting the level
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// from an ircd::ctx. If the level is set from the main stack then
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// the caller will have to do synchronization themselves.
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ctx::latch latch
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{
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bool(ctx::current) // latch has count of 1 if we're on an ircd::ctx
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};
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// This function will notify the user of the change to IRCd. When there
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// are listeners, function is posted to the io_context ensuring THERE IS
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// NO CONTINUATION ON THIS STACK by the user.
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const auto call_users{[new_level, &latch, latching(!latch.is_ready())]
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{
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assert(new_level == run::level);
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log::notice
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if(!ctx::current && level != chadburn)
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throw panic
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{
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"IRCd %s", reflect(new_level)
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"Transition '%s' -> '%s' already in progress; cannot wait without ctx",
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reflect(chadburn),
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reflect(level),
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};
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log::flush();
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changed::dock.notify_all();
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for(const auto &handler : changed::list) try
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{
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(*handler)(new_level);
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}
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catch(const std::exception &e)
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{
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log::critical
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{
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"Runlevel change to %s handler(%p) :%s",
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reflect(new_level),
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handler,
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e.what()
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};
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}
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// Wait for
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changed::dock.wait([]
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{
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return level == chadburn;
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});
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if(latching)
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latch.count_down();
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_level = new_level;
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const unwind chadburn_{[]
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{
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_chadburn = level;
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}};
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static ios::descriptor descriptor
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changed::dock.notify_all();
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log::debug
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{
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"ircd::run::set"
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"IRCd level transition from '%s' to '%s' (dock:%zu callbacks:%zu)",
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reflect(chadburn),
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reflect(level),
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changed::dock.size(),
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changed::list.size(),
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};
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if(changed::list.size() && ctx::current)
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ircd::post(descriptor, call_users);
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else
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call_users();
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log::notice
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{
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"IRCd %s", reflect(level)
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};
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if(ctx::current)
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latch.wait();
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log::flush();
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for(const auto &handler : changed::list) try
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{
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handler->function(new_level);
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}
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catch(const std::exception &e)
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{
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switch(level)
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{
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case level::IDLE: throw;
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default: break;
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}
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log::critical
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{
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"Runlevel change to %s handler(%p) :%s",
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reflect(new_level),
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handler,
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e.what()
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};
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}
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return true;
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}
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@ -524,6 +477,7 @@ ircd::run::reflect(const enum run::level &level)
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case level::HALT: return "HALT";
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case level::READY: return "READY";
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case level::START: return "START";
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case level::IDLE: return "IDLE";
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case level::RUN: return "RUN";
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case level::QUIT: return "QUIT";
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case level::FAULT: return "FAULT";
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@ -190,7 +190,7 @@ void
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ircd::m::on_load()
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try
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{
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assert(ircd::run::level == run::level::START);
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assert(ircd::run::level == run::level::IDLE);
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//reload_conf();
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_fetch = std::make_unique<fetch::init>();
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//_modules = std::make_unique<init::modules>();
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