mirror of
https://github.com/matrix-construct/construct
synced 2024-12-30 17:34:04 +01:00
157 lines
3.3 KiB
C++
157 lines
3.3 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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namespace ircd::m::relation
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{
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static void handle_fetch(const event &, vm::eval &);
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extern hookfn<vm::eval &> fetch_hook;
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extern conf::item<seconds> fetch_timeout;
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extern conf::item<bool> fetch_enable;
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}
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ircd::mapi::header
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IRCD_MODULE
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{
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"Matrix relations"
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};
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decltype(ircd::m::relation::fetch_enable)
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ircd::m::relation::fetch_enable
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{
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{ "name", "ircd.m.relation.fetch.enable" },
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{ "default", true },
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};
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decltype(ircd::m::relation::fetch_timeout)
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ircd::m::relation::fetch_timeout
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{
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{ "name", "ircd.m.relation.fetch.timeout" },
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{ "default", 5L },
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};
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decltype(ircd::m::relation::fetch_hook)
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ircd::m::relation::fetch_hook
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{
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handle_fetch,
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{
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{ "_site", "vm.fetch.prev" },
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}
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};
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void
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ircd::m::relation::handle_fetch(const event &event,
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vm::eval &eval)
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try
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{
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assert(eval.opts);
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const auto &opts{*eval.opts};
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if(!opts.fetch || !fetch_enable)
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return;
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if(my(event))
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return;
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// event must be in a room for now; we won't have context until dht
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if(!json::get<"room_id"_>(event))
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return;
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const auto &content
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{
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json::get<"content"_>(event)
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};
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const json::object &m_relates_to
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{
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content["m.relates_to"]
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};
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if(!m_relates_to || !json::type(m_relates_to, json::OBJECT))
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return;
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const json::object &m_in_reply_to
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{
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m_relates_to["m.in_reply_to"]
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};
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const m::event::id &event_id
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{
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json::type(m_in_reply_to, json::OBJECT)?
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m_in_reply_to.get<json::string>("event_id"):
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m_relates_to.get<json::string>("event_id")
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};
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// If the relates_to is a prev_event then the vm::fetch unit will perform
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// the fetch so this will just be redundant and we can bail.
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const event::prev prev{event};
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if(prev.prev_events_has(event_id))
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return;
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if(likely(m::exists(event_id)))
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return;
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log::dwarning
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{
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log, "%s in %s by %s relates to missing %s; fetching...",
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string_view(event.event_id),
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string_view(at<"room_id"_>(event)),
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string_view(at<"sender"_>(event)),
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string_view(event_id),
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};
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m::fetch::opts fetch_opts;
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fetch_opts.op = m::fetch::op::event;
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fetch_opts.room_id = at<"room_id"_>(event);
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fetch_opts.event_id = event_id;
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auto request
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{
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m::fetch::start(fetch_opts)
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};
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const auto response
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{
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request.get(seconds(fetch_timeout))
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};
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const json::array pdus
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{
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json::object(response).get("pdus")
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};
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if(pdus.empty())
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return;
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const m::event result
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{
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json::object(pdus.at(0)), event_id
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};
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auto eval_opts(opts);
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eval_opts.phase.set(vm::phase::FETCH_PREV, false);
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eval_opts.phase.set(vm::phase::FETCH_STATE, false);
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eval_opts.node_id = response.origin;
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vm::eval
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{
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result, eval_opts
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};
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}
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catch(const ctx::interrupted &)
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{
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throw;
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}
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catch(const std::exception &e)
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{
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log::derror
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{
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log, "Failed to fetch relation for %s in %s :%s",
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string_view(event.event_id),
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string_view(json::get<"room_id"_>(event)),
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e.what(),
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};
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}
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