mirror of
https://github.com/matrix-construct/construct
synced 2024-12-11 08:02:59 +01:00
441 lines
7 KiB
C++
441 lines
7 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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template<>
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decltype(ircd::util::instance_list<ircd::m::gossip>::allocator)
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ircd::util::instance_list<ircd::m::gossip>::allocator
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{};
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template<>
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decltype(ircd::util::instance_list<ircd::m::gossip>::list)
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ircd::util::instance_list<ircd::m::gossip>::list
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{
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allocator
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};
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decltype(ircd::m::gossip::log)
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ircd::m::gossip::log
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{
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"m.gossip"
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};
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ircd::m::gossip::gossip::gossip(const struct opts &opts)
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:opts{opts}
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{
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for(size_t i(0); i < opts.rounds; ++i)
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if(!gossip_head())
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break;
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}
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ircd::m::gossip::~gossip()
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noexcept try
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{
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while(!requests.empty())
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while(handle());
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}
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catch(const ctx::interrupted &)
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{
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return;
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}
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catch(const ctx::terminated &)
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{
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return;
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}
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bool
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ircd::m::gossip::gossip_head()
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{
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bool ret
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{
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false
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};
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if(opts.hint && opts.hint_only && opts.room.event_id)
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{
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m::event result;
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result.event_id = opts.room.event_id;
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json::get<"origin"_>(result) = opts.hint;
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ret |= handle_head(result);
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return ret;
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}
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if(opts.hint && opts.hint_only)
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{
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const unique_mutable_buffer buf
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{
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16_KiB
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};
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const auto event
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{
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m::room::head::fetch::one(buf, opts.room, opts.hint)
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};
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m::for_each(event::prev{event}, [this, &ret]
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(const event::id &event_id)
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{
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m::event result;
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json::get<"origin"_>(result) = opts.hint;
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result.event_id = event_id;
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ret |= handle_head(result);
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return true;
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});
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return ret;
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}
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m::room::head::fetch::opts hfopts;
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hfopts.room_id = opts.room.room_id;
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hfopts.top = m::top(opts.room.room_id);
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hfopts.existing = true;
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m::room::head::fetch
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{
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hfopts, [this, &ret]
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(const m::event &result)
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{
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ret |= handle_head(result);
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return true;
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}
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};
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return ret;
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}
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bool
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ircd::m::gossip::handle_head(const m::event &result)
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{
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const auto &remote
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{
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json::get<"origin"_>(result)
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};
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const bool submitted
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{
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submit(result.event_id, remote)
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};
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return submitted;
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}
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bool
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ircd::m::gossip::submit(const m::event::id &event_id,
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const string_view &remote)
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{
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const auto hash
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{
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(uint128_t(ircd::hash(event_id)))
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| (uint128_t(ircd::hash(remote)) << 64)
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};
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auto it
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{
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attempts.lower_bound(hash)
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};
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const bool exists
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{
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it != end(attempts) && *it == hash
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};
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if(!exists)
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it = attempts.emplace_hint(it, hash);
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const bool submitted
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{
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!exists && !started(event_id, remote)?
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start(event_id, remote):
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false
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};
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if(submitted || full())
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while(handle());
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return submitted;
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}
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bool
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ircd::m::gossip::start(const m::event::id &event_id_,
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const string_view &remote_)
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try
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{
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static const size_t max
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{
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48
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};
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const auto event_idx_
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{
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m::index(std::nothrow, event_id_)
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};
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const m::event::refs refs
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{
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event_idx_
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};
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size_t num{0}, i{0};
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std::array<event::idx, max> next_idx;
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refs.for_each(dbs::ref::NEXT, [this, &next_idx, &num]
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(const event::idx &event_idx, const auto &ref_type)
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{
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assert(ref_type == dbs::ref::NEXT);
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if(event_idx < opts.ref.first || event_idx > opts.ref.second)
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return true;
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next_idx.at(num) = event_idx;
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return ++num < next_idx.size();
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});
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if(!num)
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return false;
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unique_mutable_buffer _buf
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{
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(event::MAX_SIZE * num) + 16_KiB
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};
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mutable_buffer buf{_buf};
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json::stack out{buf};
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{
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json::stack::object top
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{
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out
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};
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json::stack::member
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{
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top, "origin", m::my_host()
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};
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json::stack::member
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{
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top, "origin_server_ts", json::value
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{
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ircd::time<milliseconds>()
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}
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};
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json::stack::array pdus
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{
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top, "pdus"
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};
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m::event::fetch event;
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for(i = 0; i < num; ++i)
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{
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if(!seek(std::nothrow, event, next_idx.at(i)))
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continue;
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pdus.append(event.source);
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log::debug
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{
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log, "Gossip %zu/%zu in %s for %s to '%s' %s idx:%lu",
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i,
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num,
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string_view{opts.room.room_id},
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string_view{event_id_},
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remote_,
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string_view{event.event_id},
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event.event_idx,
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};
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}
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}
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if(!i)
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return false;
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const string_view txn
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{
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out.completed()
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};
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consume(buf, size(txn));
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const string_view txnid
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{
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m::txn::create_id(buf, txn)
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};
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consume(buf, size(txnid));
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const string_view remote
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{
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strlcpy{buf, remote_}
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};
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consume(buf, size(remote));
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const string_view event_id
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{
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strlcpy{buf, event_id_}
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};
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consume(buf, size(event_id));
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assert(!empty(buf));
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char pbuf[48];
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log::debug
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{
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log, "Gossip %zu/%zu in %s for %s to '%s' txn[%s] %s",
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i,
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num,
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string_view{opts.room.room_id},
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string_view{event_id_},
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remote_,
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txnid,
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pretty(pbuf, iec(size(txn))),
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};
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m::fed::send::opts fedopts;
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fedopts.remote = remote;
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requests.emplace_back(result
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{
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std::move(_buf),
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txn,
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txnid,
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remote,
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event_id,
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m::fed::send
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{
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txnid,
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txn,
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buf,
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std::move(fedopts)
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}
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});
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return true;
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}
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catch(const ctx::interrupted &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, "Gossip %s in %s from '%s' :%s",
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string_view{event_id_},
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string_view{opts.room.room_id},
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remote_,
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e.what(),
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};
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return false;
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}
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bool
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ircd::m::gossip::handle()
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{
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if(requests.empty())
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return false;
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auto next
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{
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ctx::when_any(std::begin(requests), std::end(requests), []
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(auto &it) -> ctx::future<http::code> &
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{
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return it->request;
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})
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};
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const milliseconds timeout
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{
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full()? 5000: 50
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};
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ctx::interruption_point();
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if(!next.wait(timeout, std::nothrow))
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return full();
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const unique_iterator it
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{
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requests, next.get()
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};
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assert(it.it != std::end(requests));
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return handle(*it.it);
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}
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bool
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ircd::m::gossip::handle(result &result)
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try
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{
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auto response
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{
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result.request.get()
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};
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const json::object body
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{
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result.request
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};
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fed::send::response{body}.for_each_pdu([&]
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(const event::id &event_id, const json::object &errors)
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{
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const bool ok
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{
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empty(errors)
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};
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log::logf
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{
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log, ok? log::level::DEBUG: log::level::DERROR,
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"Gossip %s in %s to '%s'%s%s",
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string_view{event_id},
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string_view{opts.room.room_id},
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string_view{result.remote},
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!ok? " :"_sv: " "_sv,
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string_view{errors},
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};
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});
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return true;
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}
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catch(const ctx::interrupted &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::logf
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{
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log, log::level::DERROR,
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"Gossip %s in %s to '%s' :%s",
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string_view{result.event_id},
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string_view{opts.room.room_id},
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string_view{result.remote},
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e.what(),
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};
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return true;
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}
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bool
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ircd::m::gossip::started(const event::id &event_id,
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const string_view &remote)
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const
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{
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const auto it
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{
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std::find_if(std::begin(requests), std::end(requests), [&]
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(const auto &result)
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{
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return result.event_id == event_id && result.remote == remote;
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})
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};
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return it != std::end(requests);
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}
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bool
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ircd::m::gossip::full()
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const noexcept
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{
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return requests.size() >= opts.width;
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}
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