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Code Issues Releases Wiki Activity

ircd:Ⓜ️:fetch: Cleanup/Improve remote selection related.

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This commit is contained in:
Jason Volk 2020-10-29 04:41:11 -07:00
parent a07498f0fe
commit cdb52ba99a
1 changed files with 68 additions and 55 deletions
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123
matrix/fetch.cc
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@ -32,8 +32,9 @@ namespace ircd::m::fetch
static bool timedout(const request &, const system_point &now);
static void _check_event(const request &, const m::event &);
static void check_response(const request &, const json::object &);
static string_view select_origin(request &, const string_view &);
static string_view select_random_origin(request &);
static bool proffer_remote(request &, const string_view &);
static bool select_remote(request &, const string_view &);
static bool select_random_remote(request &);
static void finish(request &);
static void retry(request &);
static bool start(request &, const string_view &remote);
@ -391,9 +392,9 @@ try
request.started = ircd::now<system_point>();
if(!request.origin)
select_random_origin(request);
select_random_remote(request);
for(; request.origin; select_random_origin(request))
for(; request.origin; select_random_remote(request))
{
if(start(request, request.origin))
return true;
@ -550,70 +551,82 @@ catch(const std::exception &e)
return false;
}
ircd::string_view
ircd::m::fetch::select_random_origin(request &request)
bool
ircd::m::fetch::select_random_remote(request &request)
{
// Tests if remote is potentially viable
const auto proffer{[&request](const string_view &remote)
{
return proffer_remote(request, remote);
}};
// copies randomly selected remote into the attempted set.
const auto closure{[&request](const string_view &remote)
{
select_remote(request, remote);
}};
const m::room::origins origins
{
request.opts.room_id
};
// copies randomly selected origin into the attempted set.
const auto closure{[&request]
(const string_view &origin)
{
select_origin(request, origin);
}};
// Tests if origin is potentially viable
const auto proffer{[&request]
(const string_view &origin)
{
// Don't want to request from myself.
if(my_host(origin))
return false;
// Don't want to use a peer we already tried and failed with.
if(request.attempted.count(origin))
return false;
// Don't want to use a peer marked with an error by ircd::server
if(fed::errant(origin))
return false;
return true;
}};
// Select a random server in the room
request.origin = {};
origins.random(closure, proffer);
if(origins.random(closure, proffer))
return true;
// If nothing found attempt hosts from mxids
if(!request.origin)
const auto room_id_host
{
const auto room_id_host
{
request.opts.room_id.host()
};
if(room_id_host && proffer(room_id_host))
select_origin(request, room_id_host);
}
return request.origin;
}
ircd::string_view
ircd::m::fetch::select_origin(request &request,
const string_view &origin)
{
const auto iit
{
request.attempted.emplace(std::string{origin})
request.opts.room_id.host()
};
request.origin = *iit.first;
return request.origin;
if(room_id_host && proffer_remote(request, room_id_host))
if(select_remote(request, room_id_host))
return true;
return false;
}
bool
ircd::m::fetch::select_remote(request &request,
const string_view &remote)
{
const auto it
{
request.attempted.lower_bound(remote)
};
if(it != request.attempted.end() && *it == remote)
return false;
const auto iit
{
request.attempted.emplace_hint(it, remote)
};
request.origin = *iit;
return true;
}
bool
ircd::m::fetch::proffer_remote(request &request,
const string_view &remote)
{
// Don't want to request from myself.
if(my_host(remote))
return false;
// Don't want to use a peer we already tried and failed with.
if(request.attempted.count(remote))
return false;
// Don't want to use a peer marked with an error by ircd::server
if(fed::errant(remote))
return false;
return true;
}
bool