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modules/client/rooms/members: Support multiple membership constraint query paramters for optimization.

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This commit is contained in:
Jason Volk 2019-09-18 12:20:40 -07:00
parent 321b7e32c1
commit 1d449ed134
1 changed files with 61 additions and 10 deletions
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71
modules/client/rooms/members.cc
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@ -17,18 +17,34 @@ get__members(client &client,
const resource::request &request,
const m::room::id &room_id)
{
char membershipbuf[32];
const auto &membership
// Acquire the membership/not_membership constraints from query string
char membuf[2][4][32];
string_view memship[2][4];
const size_t memcount[2]
{
url::decode(membershipbuf, request.query["membership"])
request.query.count("not_membership"),
request.query.count("membership")
};
char not_membershipbuf[32];
const auto &not_membership
for(size_t i(0); i < 4 && i < memcount[0]; ++i)
memship[0][i] = url::decode(membuf[0][i], request.query.at("not_membership", i));
for(size_t i(0); i < 4 && i < memcount[1]; ++i)
memship[1][i] = url::decode(membuf[1][i], request.query.at("membership", i));
// List of membership strings user does not want in response.
const vector_view<const string_view> not_memberships
{
url::decode(not_membershipbuf, request.query["not_membership"])
memship[0], memcount[0]
};
// List of membership strings user wants in response
const vector_view<const string_view> memberships
{
memship[1], memcount[1]
};
// Acquire the at/since parameter from query string.
char atbuf[48];
const string_view at
{
@ -55,6 +71,8 @@ get__members(client &client,
m::event::id::buf{}
};
// View the room at the requested event; if no event requested this
// instance represents the present state of the room.
const m::room room
{
room_id, event_id
@ -99,20 +117,53 @@ get__members(client &client,
room
};
members.for_each(membership, [&not_membership]
// The room::members interface can perform an optimized iteration if we
// supply a single membership type; otherwise all memberships iterated.
const string_view &membership
{
// A single membership entry is given in the query string
memberships.size() == 1?
memberships.at(0):
string_view{}
};
// Tests if a member matches all of the membership constraint params. Used
// in the members iteration closures below. Note that if a membership
// parameter was passed to for_each() all members are of that membership,
// and that membership is desired, so we don't have to run any match here.
const auto membership_match{[&memberships, &not_memberships]
(const m::user::id &member, const m::event::idx &event_idx)
{
if(m::membership(event_idx, not_membership))
if(likely(!empty(not_memberships)))
{
if(m::membership(event_idx, not_memberships))
return false;
}
else if(likely(!empty(memberships)))
{
if(!m::membership(event_idx, memberships))
return false;
}
return true;
}};
// prefetch loop
members.for_each(membership, [&membership, &membership_match]
(const m::user::id &member, const m::event::idx &event_idx)
{
if(!membership && !membership_match(member, event_idx))
return true;
m::prefetch(event_idx);
return true;
});
members.for_each(membership, [&request, &chunk, &not_membership]
// stream to client
members.for_each(membership, [&membership, &membership_match, &chunk]
(const m::user::id &member, const m::event::idx &event_idx)
{
if(m::membership(event_idx, not_membership))
if(!membership && !membership_match(member, event_idx))
return true;
const m::event::fetch event