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modules/federation/get_missing_events: Update get_missing_events per spec; and chunked stream.

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This commit is contained in:
Jason Volk 2018-08-22 21:01:22 -07:00
parent d7ca00c4a1
commit 6c71f43d1b
1 changed files with 81 additions and 48 deletions
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129
modules/federation/get_missing_events.cc
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@ -46,7 +46,7 @@ method_post
}
};
conf::item<size_t>
conf::item<ssize_t>
max_limit
{
{ "name", "ircd.federation.missing_events.max_limit" },
@ -54,10 +54,10 @@ max_limit
};
conf::item<size_t>
max_goose
flush_hiwat
{
{ "name", "ircd.federation.missing_events.max_goose" },
{ "default", 512L }
{ "name", "ircd.federation.missing_events.flush.hiwat" },
{ "default", long(16_KiB) },
};
resource::response
@ -75,11 +75,11 @@ get__missing_events(client &client,
url::decode(request.parv[0], room_id)
};
const auto limit
ssize_t limit
{
request["limit"]?
std::min(lex_cast<size_t>(request["limit"]), size_t(max_limit)):
size_t(max_limit)
std::min(lex_cast<ssize_t>(request["limit"]), ssize_t(max_limit)):
ssize_t(10) // default limit (protocol spec)
};
const auto min_depth
@ -99,55 +99,88 @@ get__missing_events(client &client,
request["latest_events"]
};
const auto in_latest
const auto in_earliest{[&earliest](const auto &event_id)
{
[&latest](const auto &event_id)
return end(earliest) != std::find_if(begin(earliest), end(earliest), [&event_id]
(const auto &event_id_)
{
return end(latest) != std::find_if(begin(latest), end(latest), [&event_id]
(const auto &latest)
{
return event_id == unquote(latest);
});
}
return event_id == unquote(event_id_);
});
}};
const unique_buffer<mutable_buffer> buf
{
96_KiB
};
std::vector<std::string> ret;
ret.reserve(limit);
size_t goose{0};
for(const auto &event_id : earliest) try
resource::response::chunked response
{
m::room::messages it
{
room_id, unquote(event_id)
};
client, http::OK
};
for(; it && ret.size() < limit && goose < size_t(max_goose); ++it, ++goose)
{
const m::event &event{*it};
if(!visible(event, request.node_id))
continue;
const auto flush{[&response]
(const const_buffer &buf)
{
response.write(buf);
return buf;
}};
ret.emplace_back(json::strung{event});
if(in_latest(at<"event_id"_>(event)))
json::stack out
{
buf, flush, size_t(flush_hiwat)
};
json::stack::object top{out};
json::stack::member events_m
{
top, "events"
};
json::stack::array events
{
events_m
};
std::deque<std::string> queue;
const auto add_queue{[&limit, &queue, &in_earliest]
(const m::event::id &event_id) -> bool
{
if(in_earliest(event_id))
return true;
if(end(queue) != std::find(begin(queue), end(queue), event_id))
return true;
if(--limit < 0)
return false;
queue.emplace_back(std::string{event_id});
return true;
}};
for(const auto &event_id : latest)
add_queue(unquote(event_id));
m::event::fetch event;
while(!queue.empty())
{
const auto &event_id{queue.front()};
const unwind pop{[&queue]
{
queue.pop_front();
}};
if(!seek(event, event_id, std::nothrow))
continue;
if(!visible(event, request.node_id))
continue;
events.append(event);
for(const json::array &prev : json::get<"prev_events"_>(event))
if(!add_queue(unquote(prev.at(0))))
break;
}
}
catch(const std::exception &e)
{
log::derror
{
"Request from %s for earliest missing %s :%s",
string(remote(client)),
unquote(event_id),
e.what()
};
}
return resource::response
{
client, json::members
{
{ "events", json::strung { ret.data(), ret.data() + ret.size() } }
}
};
return response;
}