mirror of
https://github.com/matrix-construct/construct
synced 2024-10-29 18:08:53 +01:00
139 lines
2.8 KiB
C++
139 lines
2.8 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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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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/// Initial gossip protocol works by sending the remote server some events which
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/// reference an event contained in the remote's head which we just obtained.
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/// This is part of a family of active measures taken to reduce forward
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/// extremities on other servers but without polluting the chain with
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/// permanent data for this purpose such as with org.matrix.dummy_event.
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ircd::m::gossip::gossip::gossip(const room::id &room_id,
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const opts &opts)
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{
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assert(opts.event_id);
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const auto &event_id
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{
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opts.event_id
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};
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const m::event::refs refs
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{
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m::index(std::nothrow, event_id)
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};
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static const size_t max{48};
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const size_t count
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{
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std::min(refs.count(dbs::ref::NEXT), max)
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};
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if(!count)
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return;
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const unique_mutable_buffer buf[]
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{
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{ event::MAX_SIZE * (count + 1) },
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{ 16_KiB },
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};
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size_t i{0};
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std::array<event::idx, max> next_idx;
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refs.for_each(dbs::ref::NEXT, [&next_idx, &i]
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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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next_idx.at(i) = event_idx;
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return ++i < next_idx.size();
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});
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size_t ret{0};
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json::stack out{buf[0]};
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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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long(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(assert(ret == 0); ret < i; ++ret)
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if(seek(std::nothrow, event, next_idx.at(ret)))
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pdus.append(event.source);
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}
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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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char idbuf[64];
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const string_view txnid
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{
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m::txn::create_id(idbuf, txn)
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};
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m::fed::send::opts fedopts;
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fedopts.remote = opts.remote;
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m::fed::send request
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{
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txnid, txn, buf[1], std::move(fedopts)
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};
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http::code code{0};
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std::exception_ptr eptr;
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if(request.wait(opts.timeout, std::nothrow)) try
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{
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code = request.get();
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ret += code == http::OK;
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}
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catch(...)
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{
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eptr = std::current_exception();
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}
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log::logf
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{
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log, code == http::OK? log::DEBUG : log::DERROR,
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"gossip %zu:%zu to %s reference to %s in %s :%s %s",
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ret,
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count,
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opts.remote,
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string_view{event_id},
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string_view{room_id},
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code?
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status(code):
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"failed",
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eptr?
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what(eptr):
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string_view{},
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};
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}
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