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construct/matrix/init_backfill.cc
2020-04-25 23:52:59 -07:00

298 lines
6.5 KiB
C++

// Matrix Construct
//
// Copyright (C) Matrix Construct Developers, Authors & Contributors
// Copyright (C) 2016-2019 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::m::init::backfill
{
void gossip(const room::id &, const event::id &, const string_view &remote);
void handle_room(const room::id &);
void worker();
extern std::unique_ptr<context> worker_context;
extern conf::item<seconds> delay;
extern conf::item<seconds> gossip_timeout;
extern conf::item<bool> gossip_enable;
extern conf::item<bool> local_joined_only;
extern conf::item<size_t> pool_size;
extern conf::item<bool> enable;
extern log::log log;
};
decltype(ircd::m::init::backfill::log)
ircd::m::init::backfill::log
{
"m.init.backfill"
};
decltype(ircd::m::init::backfill::enable)
ircd::m::init::backfill::enable
{
{ "name", "ircd.m.init.backfill.enable" },
{ "default", true },
};
decltype(ircd::m::init::backfill::pool_size)
ircd::m::init::backfill::pool_size
{
{ "name", "ircd.m.init.backfill.pool_size" },
{ "default", 12L },
};
decltype(ircd::m::init::backfill::local_joined_only)
ircd::m::init::backfill::local_joined_only
{
{ "name", "ircd.m.init.backfill.local_joined_only" },
{ "default", true },
};
decltype(ircd::m::init::backfill::gossip_enable)
ircd::m::init::backfill::gossip_enable
{
{ "name", "ircd.m.init.backfill.gossip.enable" },
{ "default", true },
};
decltype(ircd::m::init::backfill::gossip_timeout)
ircd::m::init::backfill::gossip_timeout
{
{ "name", "ircd.m.init.backfill.gossip.timeout" },
{ "default", 5L },
};
decltype(ircd::m::init::backfill::delay)
ircd::m::init::backfill::delay
{
{ "name", "ircd.m.init.backfill.delay" },
{ "default", 15L },
};
decltype(ircd::m::init::backfill::worker_context)
ircd::m::init::backfill::worker_context;
void
ircd::m::init::backfill::init()
{
if(!enable)
{
log::warning
{
log, "Initial synchronization of rooms from remote servers has"
" been disabled by the configuration. Not fetching latest events."
};
return;
}
if(ircd::read_only || ircd::write_avoid)
{
log::warning
{
log, "Not performing initial backfill because write-avoid flag is set."
};
return;
}
assert(!worker_context);
worker_context.reset(new context
{
"m.init.backfill",
512_KiB,
&worker,
context::POST
});
}
void
ircd::m::init::backfill::fini()
noexcept
{
if(!worker_context)
return;
log::debug
{
log, "Terminating worker context..."
};
worker_context.reset(nullptr);
}
void
ircd::m::init::backfill::worker()
try
{
// Wait for runlevel RUN before proceeding...
run::barrier<ctx::interrupted>{};
// Set a low priority for this context; see related pool_opts
ionice(ctx::cur(), 4);
nice(ctx::cur(), 4);
// Prepare to iterate all of the rooms this server is aware of which
// contain at least one member from another server in any state, and
// one member from our server in a joined state.
rooms::opts opts;
opts.remote_only = true;
opts.local_joined_only = local_joined_only;
// This is only an estimate because the rooms on the server can change
// before this task completes.
const auto estimate
{
1UL //rooms::count(opts)
};
if(!estimate)
return;
// Wait a delay before starting.
ctx::sleep(seconds(delay));
log::notice
{
log, "Starting initial backfill of rooms from other servers...",
estimate,
};
// Prepare a pool of child contexts to process rooms concurrently.
// The context pool lives directly in this frame.
static const ctx::pool::opts pool_opts
{
512_KiB, // stack sz
size_t(pool_size), // pool sz
-1, // queue max hard
0, // queue max soft
true, // queue max blocking
true, // queue max warning
3, // ionice
3, // nice
};
ctx::pool pool
{
"m.init.backfill",
pool_opts
};
// Iterate the room_id's, submitting a copy of each to the next pool
// worker; the submission blocks when all pool workers are busy, as per
// the pool::opts.
ctx::dock dock;
size_t count(0), complete(0);
const ctx::uninterruptible ui;
rooms::for_each(opts, [&pool, &count, &complete, &estimate, &dock]
(const room::id &room_id)
{
if(unlikely(ctx::interruption_requested()))
return false;
++count;
pool([&, room_id(std::string(room_id))] // asynchronous
{
const unwind completed{[&complete, &dock]
{
++complete;
dock.notify_one();
}};
handle_room(room_id);
log::info
{
log, "Initial backfill of %s complete:%zu", //estimate:%zu %02.2lf%%",
string_view{room_id},
complete,
estimate,
(complete / double(estimate)) * 100.0,
};
});
return true;
});
if(complete < count)
log::dwarning
{
log, "Waiting for initial resynchronization count:%zu complete:%zu rooms...",
count,
complete,
};
if(unlikely(ctx::interruption_requested()))
pool.terminate();
// All rooms have been submitted to the pool but the pool workers might
// still be busy. If we unwind now the pool's dtor will kill the workers
// so we synchronize their completion here.
dock.wait([&complete, &count]
{
return complete >= count;
});
if(unlikely(ctx::interruption_requested()))
return;
log::notice
{
log, "Initial resynchronization of %zu rooms completed.",
count,
};
}
catch(const ctx::interrupted &e)
{
log::derror
{
log, "Worker interrupted without completing resynchronization of all rooms."
};
throw;
}
catch(const ctx::terminated &e)
{
log::error
{
log, "Worker terminated without completing resynchronization of all rooms."
};
throw;
}
catch(const std::exception &e)
{
log::critical
{
log, "Worker fatal :%s",
e.what(),
};
}
void
ircd::m::init::backfill::handle_room(const room::id &room_id)
{
m::acquire::opts opts;
m::acquire::acquire
{
room_id, opts
};
}
void
ircd::m::init::backfill::gossip(const room::id &room_id,
const event::id &event_id,
const string_view &remote)
{
m::gossip::opts opts;
opts.timeout = seconds(gossip_timeout);
opts.remote = remote;
opts.event_id = event_id;
gossip::gossip
{
room_id, opts
};
}