mirror of
https://github.com/matrix-construct/construct
synced 2024-12-12 00:22:58 +01:00
806 lines
16 KiB
C++
806 lines
16 KiB
C++
// The Construct
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//
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// Copyright (C) The Construct Developers, Authors & Contributors
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// Copyright (C) 2016-2020 Jason Volk <jason@zemos.net>
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//
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// Permission to use, copy, modify, and/or distribute this software for any
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// purpose with or without fee is hereby granted, provided that the above
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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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namespace ircd::m::vm::fetch
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{
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static void prev_check(const event &, vm::eval &);
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static bool prev_wait(const event &, vm::eval &);
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static std::forward_list<ctx::future<m::fetch::result>> prev_fetch(const event &, vm::eval &, const room &);
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static void prev_eval(const event &, vm::eval &, ctx::future<m::fetch::result> &);
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static void prev(const event &, vm::eval &, const room &);
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static std::forward_list<ctx::future<m::fetch::result>> state_fetch(const event &, vm::eval &, const room &);
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static void state(const event &, vm::eval &, const room &);
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static void auth_chain_eval(const event &, vm::eval &, const room &, const json::array &, const string_view &);
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static void auth_chain(const event &, vm::eval &, const room &);
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static void auth(const event &, vm::eval &, const room &);
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static void handle(const event &, vm::eval &);
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extern conf::item<milliseconds> prev_fetch_check_interval;
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extern conf::item<milliseconds> prev_wait_time;
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extern conf::item<size_t> prev_wait_count;
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extern conf::item<size_t> prev_backfill_limit;
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extern conf::item<seconds> event_timeout;
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extern conf::item<seconds> state_timeout;
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extern conf::item<seconds> auth_timeout;
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extern conf::item<bool> enable;
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extern hookfn<vm::eval &> auth_hook;
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extern hookfn<vm::eval &> prev_hook;
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extern hookfn<vm::eval &> state_hook;
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extern log::log log;
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}
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decltype(ircd::m::vm::fetch::log)
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ircd::m::vm::fetch::log
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{
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"m.vm.fetch"
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};
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decltype(ircd::m::vm::fetch::auth_hook)
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ircd::m::vm::fetch::auth_hook
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{
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handle,
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{
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{ "_site", "vm.fetch.auth" }
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}
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};
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decltype(ircd::m::vm::fetch::prev_hook)
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ircd::m::vm::fetch::prev_hook
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{
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handle,
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{
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{ "_site", "vm.fetch.prev" }
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}
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};
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decltype(ircd::m::vm::fetch::state_hook)
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ircd::m::vm::fetch::state_hook
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{
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handle,
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{
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{ "_site", "vm.fetch.state" }
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}
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};
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decltype(ircd::m::vm::fetch::enable)
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ircd::m::vm::fetch::enable
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{
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{ "name", "ircd.m.vm.fetch.enable" },
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{ "default", true },
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};
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decltype(ircd::m::vm::fetch::auth_timeout)
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ircd::m::vm::fetch::auth_timeout
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{
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{ "name", "ircd.m.vm.fetch.auth.timeout" },
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{ "default", 15L },
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};
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decltype(ircd::m::vm::fetch::state_timeout)
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ircd::m::vm::fetch::state_timeout
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{
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{ "name", "ircd.m.vm.fetch.state.timeout" },
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{ "default", 20L },
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};
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decltype(ircd::m::vm::fetch::event_timeout)
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ircd::m::vm::fetch::event_timeout
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{
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{ "name", "ircd.m.vm.fetch.event.timeout" },
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{ "default", 10L },
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};
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decltype(ircd::m::vm::fetch::prev_backfill_limit)
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ircd::m::vm::fetch::prev_backfill_limit
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{
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{ "name", "ircd.m.vm.fetch.prev.backfill.limit" },
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{ "default", 128L },
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};
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decltype(ircd::m::vm::fetch::prev_wait_count)
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ircd::m::vm::fetch::prev_wait_count
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{
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{ "name", "ircd.m.vm.fetch.prev.wait.count" },
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{ "default", 4L },
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};
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decltype(ircd::m::vm::fetch::prev_wait_time)
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ircd::m::vm::fetch::prev_wait_time
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{
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{ "name", "ircd.m.vm.fetch.prev.wait.time" },
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{ "default", 200L },
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};
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decltype(ircd::m::vm::fetch::prev_fetch_check_interval)
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ircd::m::vm::fetch::prev_fetch_check_interval
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{
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{ "name", "ircd.m.vm.fetch.prev.fetch.check_interval" },
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{ "default", 500L },
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};
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//
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// fetch_phase
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//
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void
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ircd::m::vm::fetch::handle(const event &event,
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vm::eval &eval)
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try
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{
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if(eval.room_internal)
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return;
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assert(eval.opts);
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const auto &opts
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{
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*eval.opts
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};
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const auto &type
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{
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at<"type"_>(event)
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};
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if(type == "m.room.create")
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return;
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const m::event::id &event_id
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{
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event.event_id
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};
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const m::room::id &room_id
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{
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at<"room_id"_>(event)
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};
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// Can't construct m::room with the event_id argument because it
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// won't be found (we're evaluating that event here!) so we just set
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// the member manually to make further use of the room struct.
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m::room room{room_id};
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room.event_id = event_id;
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if(eval.phase == phase::FETCH_AUTH)
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return auth(event, eval, room);
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if(eval.phase == phase::FETCH_PREV)
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return prev(event, eval, room);
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if(eval.phase == phase::FETCH_STATE)
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return state(event, eval, room);
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}
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catch(const std::exception &e)
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{
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log::derror
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{
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log, "%s :%s",
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loghead(eval),
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e.what(),
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};
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throw;
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}
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//
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// auth_events handler stack
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//
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void
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ircd::m::vm::fetch::auth(const event &event,
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vm::eval &eval,
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const room &room)
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{
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// Count how many of the auth_events provided exist locally.
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const auto &opts{*eval.opts};
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const event::auth prev
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{
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event
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};
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const size_t auth_count
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{
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prev.auth_events_count()
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};
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const size_t auth_exists
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{
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prev.auth_events_exist()
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};
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assert(auth_exists <= auth_count);
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if(auth_exists != auth_count) try
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{
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log::dwarning
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{
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log, "%s auth_events:%zu miss:%zu",
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loghead(eval),
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auth_count,
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auth_count - auth_exists,
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};
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if(!bool(m::vm::fetch::enable))
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throw vm::error
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{
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vm::fault::AUTH, "Fetching auth_events disabled by configuration",
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};
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// This is a blocking call to recursively fetch and evaluate the auth_chain
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// for this event. Upon return all of the auth_events for this event will
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// have themselves been fetched and auth'ed recursively.
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auth_chain(event, eval, room);
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}
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catch(const std::exception &e)
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{
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const ctx::exception_handler eh;
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throw vm::error
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{
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vm::fault::AUTH, "Failed to fetch %zu of %zu auth_events :%s",
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auth_count - prev.auth_events_exist(),
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auth_count,
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e.what()
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};
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}
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}
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void
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ircd::m::vm::fetch::auth_chain(const event &event,
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vm::eval &eval,
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const room &room)
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try
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{
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assert(eval.opts);
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// Figure out a remote hint as the primary target to request the missing
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// auth events from; if provided, m::fetch will ask this remote first. We
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// try to use the eval.node_id, which is set to a server that is conducting
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// the eval (i.e in a /send/ or when processing some response data from
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// them); next we try the origin of the event itself. These remotes are
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// most likely to provide a satisfying response.
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const string_view hint
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{
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eval.opts->node_id && !my_host(eval.opts->node_id)?
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eval.opts->node_id:
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event.event_id.host() && !my_host(event.event_id.host())?
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event.event_id.host():
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!my_host(json::get<"origin"_>(event))?
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string_view(json::get<"origin"_>(event)):
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room.room_id.host() && !my_host(room.room_id.host())?
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room.room_id.host():
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string_view{}
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};
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log::debug
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{
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log, "Fetching auth chain for %s in %s hint:%s",
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string_view{room.event_id},
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string_view{room.room_id},
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hint,
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};
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// send
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auto future
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{
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m::fetch::start(
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{
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.op = m::fetch::op::auth,
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.room_id = room.room_id,
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.event_id = room.event_id,
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.hint = hint,
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.check_hashes = false,
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})
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};
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// recv
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const auto result
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{
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future.get(seconds(auth_timeout))
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};
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const json::object response
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{
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result
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};
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// parse
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const json::array &auth_chain
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{
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response["auth_chain"]
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};
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auth_chain_eval(event, eval, room, auth_chain, result.origin);
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}
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catch(const vm::error &e)
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{
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throw;
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}
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catch(const std::exception &e)
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{
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log::error
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{
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log, "Fetching auth chain for %s in %s :%s",
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string_view{room.event_id},
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string_view{room.room_id},
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e.what(),
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};
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throw;
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}
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void
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ircd::m::vm::fetch::auth_chain_eval(const event &event,
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vm::eval &eval,
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const room &room,
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const json::array &auth_chain_,
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const string_view &origin)
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try
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{
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assert(eval.opts);
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auto opts(*eval.opts);
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opts.fetch = false;
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opts.infolog_accept = true;
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opts.warnlog &= ~vm::fault::EXISTS;
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opts.notify_servers = false;
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opts.node_id = origin;
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std::vector<m::event> auth_chain
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(
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std::begin(auth_chain_), std::end(auth_chain_)
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);
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// pre-sort here and indicate that to eval.
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std::sort(begin(auth_chain), end(auth_chain));
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opts.ordered = true;
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log::debug
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{
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log, "Evaluating auth chain for %s in %s events:%zu",
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string_view{room.event_id},
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string_view{room.room_id},
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auth_chain.size(),
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};
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// eval
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m::vm::eval
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{
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auth_chain, opts
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};
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}
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catch(const std::exception &e)
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{
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log::error
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{
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log, "Evaluating auth chain for %s in %s :%s",
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string_view{room.event_id},
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string_view{room.room_id},
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e.what(),
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};
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throw;
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}
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//
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// state handler stack
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//
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void
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ircd::m::vm::fetch::state(const event &event,
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vm::eval &eval,
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const room &room)
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try
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{
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const auto &opts{*eval.opts};
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const event::prev prev
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{
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event
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};
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const bool prev_exist
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{
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prev.prev_exist()
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};
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if(opts.fetch_state_any)
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if(prev_exist && prev.prev_events_count() == prev.prev_events_exist())
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return;
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if(likely(!opts.fetch_state_any))
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if(prev_exist)
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return;
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if(likely(!opts.fetch_state_shallow))
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{
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const auto &[sounding_depth, sounding_idx]
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{
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m::sounding(room.room_id)
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};
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if(at<"depth"_>(event) > sounding_depth)
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return;
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}
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log::dwarning
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{
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log, "%s fetching possible missing state in %s",
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loghead(eval),
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string_view{room.room_id},
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};
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struct m::acquire::opts acq_opts;
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acq_opts.room = room;
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acq_opts.head = false;
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acq_opts.history = false;
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acq_opts.state = true;
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acq_opts.hint = opts.node_id;
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m::acquire acq
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{
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acq_opts
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};
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//TODO: XXX
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log::info
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{
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log, "%s evaluated missing state in %s fetched:-- good:-- fail:--",
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loghead(eval),
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string_view{room.room_id},
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0,
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0,
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0,
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};
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}
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catch(const std::exception &e)
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{
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log::error
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{
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log, "%s state fetch in %s :%s",
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loghead(eval),
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string_view{room.room_id},
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e.what(),
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};
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throw;
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}
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//
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// prev_events handler stack
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//
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void
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ircd::m::vm::fetch::prev(const event &event,
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vm::eval &eval,
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const room &room)
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{
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const auto &opts{*eval.opts};
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const event::prev prev{event};
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const size_t prev_count
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{
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prev.prev_events_count()
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};
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const size_t prev_exists
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{
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prev.prev_events_exist()
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};
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assert(prev_exists <= prev_count);
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if(prev_count == prev_exists)
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return;
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// Attempt to wait for missing prev_events without issuing fetches here.
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if(prev_wait(event, eval))
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return;
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if(!m::vm::fetch::enable)
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{
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prev_check(event, eval);
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return;
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}
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auto futures
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{
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prev_fetch(event, eval, room)
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};
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// At this point one or more prev_events are missing; the fetches were
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// launched asynchronously if the options allowed for it.
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log::dwarning
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{
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log, "%s depth:%ld prev_events:%zu miss:%zu fetching:%zu fetching ...",
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loghead(eval),
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at<"depth"_>(event),
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prev_count,
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prev_count - prev_exists,
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std::distance(begin(futures), end(futures)),
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};
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auto fetching
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{
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ctx::when_all(begin(futures), end(futures))
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};
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const auto timeout
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{
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now<system_point>() + seconds(event_timeout)
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};
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const milliseconds &check_interval
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{
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prev_fetch_check_interval
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};
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// Rather than waiting for all of the events to arrive or for the entire
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// timeout to expire, we check if the sought events made it to the server
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// in the meantime. If so we can drop these requests and bail.
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//TODO: Ideally should be replaced with listener/notification/hook on the
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//TODO: events arriving rather than this coarse sleep cycles.
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while(now<system_point>() < timeout)
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{
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// Wait for an interval to give this loop some iterations.
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if(fetching.wait(check_interval, std::nothrow))
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break;
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// Check for satisfaction.
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if(prev.prev_events_exist() == prev_count)
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return;
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}
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// evaluate results
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for(auto &future : futures)
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prev_eval(event, eval, future);
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// check if result evals have satisfied this eval now; or throw
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prev_check(event, eval);
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}
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void
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ircd::m::vm::fetch::prev_eval(const event &event,
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vm::eval &eval,
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ctx::future<m::fetch::result> &future)
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try
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{
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m::fetch::result result
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{
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future.get()
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};
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const json::object content
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{
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result
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};
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const json::array &pdus
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{
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content["pdus"]
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};
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auto opts(*eval.opts);
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opts.phase.set(m::vm::phase::FETCH_PREV, false);
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opts.phase.set(m::vm::phase::FETCH_STATE, false);
|
|
opts.notify_servers = false;
|
|
opts.node_id = result.origin;
|
|
log::debug
|
|
{
|
|
log, "%s fetched %zu pdus; evaluating...",
|
|
loghead(eval),
|
|
pdus.size(),
|
|
};
|
|
|
|
vm::eval
|
|
{
|
|
pdus, opts
|
|
};
|
|
}
|
|
catch(const ctx::interrupted &)
|
|
{
|
|
throw;
|
|
}
|
|
catch(const std::exception &e)
|
|
{
|
|
log::derror
|
|
{
|
|
log, "%s prev fetch/eval :%s",
|
|
loghead(eval),
|
|
e.what(),
|
|
};
|
|
}
|
|
|
|
std::forward_list
|
|
<
|
|
ircd::ctx::future<ircd::m::fetch::result>
|
|
>
|
|
ircd::m::vm::fetch::prev_fetch(const event &event,
|
|
vm::eval &eval,
|
|
const room &room)
|
|
{
|
|
const long room_depth
|
|
{
|
|
m::depth(std::nothrow, room)
|
|
};
|
|
|
|
const long viewport_depth
|
|
{
|
|
room_depth - room::events::viewport_size
|
|
};
|
|
|
|
std::forward_list
|
|
<
|
|
ctx::future<m::fetch::result>
|
|
>
|
|
ret;
|
|
const event::prev prev{event};
|
|
for(size_t i(0); i < prev.prev_events_count(); ++i) try
|
|
{
|
|
const auto &prev_id
|
|
{
|
|
prev.prev_event(i)
|
|
};
|
|
|
|
if(m::exists(prev_id))
|
|
continue;
|
|
|
|
const long depth_gap
|
|
{
|
|
std::max(std::abs(at<"depth"_>(event) - room_depth), 1L)
|
|
};
|
|
|
|
const auto backfill_max
|
|
{
|
|
std::min(size_t(prev_backfill_limit), eval.opts->fetch_prev_limit)
|
|
};
|
|
|
|
const auto backfill_limit
|
|
{
|
|
std::min(size_t(depth_gap), backfill_max)
|
|
};
|
|
|
|
const string_view hint
|
|
{
|
|
eval.opts->node_id && !my_host(eval.opts->node_id)?
|
|
eval.opts->node_id:
|
|
|
|
prev_id.host() && !my_host(prev_id.host())?
|
|
prev_id.host():
|
|
|
|
!my_host(json::get<"origin"_>(event))?
|
|
string_view(json::get<"origin"_>(event)):
|
|
|
|
room.room_id.host() && !my_host(room.room_id.host())?
|
|
room.room_id.host():
|
|
|
|
string_view{}
|
|
};
|
|
|
|
log::debug
|
|
{
|
|
log, "%s requesting backfill off %s; "
|
|
"depth:%ld viewport:%ld room:%ld gap:%ld limit:%zu hint:%s",
|
|
loghead(eval),
|
|
string_view{prev_id},
|
|
at<"depth"_>(event),
|
|
viewport_depth,
|
|
room_depth,
|
|
depth_gap,
|
|
backfill_limit,
|
|
hint,
|
|
};
|
|
|
|
ret.emplace_front(m::fetch::start(
|
|
{
|
|
.op = m::fetch::op::backfill,
|
|
.room_id = room.room_id,
|
|
.event_id = prev_id,
|
|
.hint = hint,
|
|
.backfill_limit = backfill_limit,
|
|
}));
|
|
}
|
|
catch(const ctx::interrupted &)
|
|
{
|
|
throw;
|
|
}
|
|
catch(const std::exception &e)
|
|
{
|
|
log::derror
|
|
{
|
|
log, "%s requesting backfill off prev %s; depth:%ld :%s",
|
|
loghead(eval),
|
|
string_view{prev.prev_event(i)},
|
|
json::get<"depth"_>(event),
|
|
e.what(),
|
|
};
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
bool
|
|
ircd::m::vm::fetch::prev_wait(const event &event,
|
|
vm::eval &eval)
|
|
{
|
|
const auto &opts(*eval.opts);
|
|
const event::prev prev(event);
|
|
const milliseconds &wait_time
|
|
{
|
|
opts.fetch_prev_wait_time >= 0ms?
|
|
opts.fetch_prev_wait_time:
|
|
milliseconds(prev_wait_time)
|
|
};
|
|
|
|
const auto ids
|
|
{
|
|
prev.prev_events_count()
|
|
};
|
|
|
|
assume(ids <= event::prev::MAX);
|
|
event::id buf[event::prev::MAX];
|
|
const vector_view<const event::id> prev_id
|
|
(
|
|
prev.ids(buf)
|
|
);
|
|
|
|
const auto exists
|
|
{
|
|
notify::wait(prev_id, wait_time)
|
|
};
|
|
|
|
const bool obtained
|
|
{
|
|
exists == ids
|
|
};
|
|
|
|
return obtained;
|
|
}
|
|
|
|
void
|
|
ircd::m::vm::fetch::prev_check(const event &event,
|
|
vm::eval &eval)
|
|
{
|
|
const auto &opts
|
|
{
|
|
*eval.opts
|
|
};
|
|
|
|
const event::prev prev
|
|
{
|
|
event
|
|
};
|
|
|
|
const size_t prev_exists
|
|
{
|
|
prev.prev_events_exist()
|
|
};
|
|
|
|
// Aborts this event if the options want us to guarantee at least one
|
|
// prev_event was fetched and evaluated for this event. This is generally
|
|
// used in conjunction with the fetch_prev_wait option to be effective.
|
|
if(opts.fetch_prev_any && !prev_exists)
|
|
throw vm::error
|
|
{
|
|
vm::fault::EVENT, "Failed to fetch any of the %zu prev_events for %s in %s",
|
|
prev.prev_events_count(),
|
|
string_view{event.event_id},
|
|
json::get<"room_id"_>(event)
|
|
};
|
|
|
|
// Aborts this event if the options want us to guarantee ALL of the
|
|
// prev_events were fetched and evaluated for this event.
|
|
if(opts.fetch_prev_all && prev_exists < prev.prev_events_count())
|
|
throw vm::error
|
|
{
|
|
vm::fault::EVENT, "Missing %zu of %zu required prev_events for %s in %s",
|
|
prev_exists,
|
|
prev.prev_events_count(),
|
|
string_view{event.event_id},
|
|
json::get<"room_id"_>(event)
|
|
};
|
|
}
|