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construct/matrix/room_state_fetch.cc

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// The Construct
//
// Copyright (C) The Construct Developers, Authors & Contributors
// Copyright (C) 2016-2020 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
{
static bool room_state_fetch_result(room::state::fetch &, const room::state::fetch::opts &, const room::state::fetch::closure &, const json::array &, const string_view &);
}
ircd::m::room::state::fetch::fetch(const opts &opts,
const closure &closure)
{
m::room room
{
opts.room
};
feds::opts fopts;
fopts.op = feds::op::state;
fopts.room_id = room.room_id;
fopts.event_id = room.event_id;
fopts.arg[0] = "ids";
fopts.exclude_myself = true;
fopts.closure_errors = false;
log::debug
{
log, "Resynchronizing %s state at %s from %zu joined servers...",
string_view{room.room_id},
room.event_id?
string_view{room.event_id}:
"HEAD"_sv,
room::origins(room).count(),
};
feds::execute(fopts, [this, &opts, &closure]
(const auto &result)
{
this->respond++;
const json::array &auth_chain_ids
{
result.object["auth_chain_ids"]
};
const json::array &pdu_ids
{
result.object["pdu_ids"]
};
if(!room_state_fetch_result(*this, opts, closure, auth_chain_ids, result.origin))
return false;
if(!room_state_fetch_result(*this, opts, closure, pdu_ids, result.origin))
return false;
return true;
});
}
bool
ircd::m::room_state_fetch_result(room::state::fetch &f,
const room::state::fetch::opts &opts,
const room::state::fetch::closure &closure,
const json::array &ids,
const string_view &remote)
{
event::id event_id[64];
auto it(begin(ids)); do
{
size_t i(0);
for(; i < 64 && it != end(ids); ++it)
event_id[i++] = json::string{*it};
const vector_view<const event::id> event_ids
(
event_id, i
);
const uint64_t exists
{
!opts.existing?
m::exists(event_ids):
0UL
};
f.responses += i;
f.exists += __builtin_popcountl(exists);
for(size_t j(0); j < i; ++j)
{
if(exists & (1UL << j))
continue;
auto it
{
f.result.lower_bound(event_id[j])
};
if(likely(opts.unique))
{
if(it != std::end(f.result) && *it == event_id[j])
{
f.concur++;
continue;
}
it = f.result.emplace_hint(it, event_id[j]);
}
if(closure && opts.unique)
{
// When a reference can be made to the result set: prefer it.
assert(it != std::end(f.result));
assert(*it == event_id[j]);
if(!closure(*it, remote))
return false;
}
else if(closure)
{
if(!closure(event_id[j], remote))
return false;
}
}
}
while(it != end(ids));
return true;
}