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construct/matrix/room.cc

1384 lines
26 KiB
C++

// Matrix Construct
//
// Copyright (C) Matrix Construct Developers, Authors & Contributors
// Copyright (C) 2016-2018 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.
size_t
ircd::m::room::purge(const room &room)
{
size_t ret(0);
db::txn txn
{
*m::dbs::events
};
room.for_each([&txn, &ret]
(const m::event::idx &idx)
{
const m::event::fetch event
{
idx
};
m::dbs::write_opts opts;
opts.op = db::op::DELETE;
opts.event_idx = idx;
m::dbs::write(txn, event, opts);
++ret;
});
txn();
return ret;
}
ircd::m::room
ircd::m::create(const id::room &room_id,
const id::user &creator,
const string_view &preset)
{
return create(createroom
{
{ "room_id", room_id },
{ "creator", creator },
{ "preset", preset },
});
}
ircd::m::event::id::buf
ircd::m::invite(const room &room,
const id::user &target,
const id::user &sender)
{
json::iov content;
return invite(room, target, sender, content);
}
ircd::m::event::id::buf
ircd::m::invite(const room &room,
const user::id &target,
const user::id &sender,
json::iov &content)
{
json::iov event;
const json::iov::push push[]
{
{ event, { "type", "m.room.member" }},
{ event, { "sender", sender }},
{ event, { "state_key", target }},
{ content, { "membership", "invite" }},
};
return commit(room, event, content);
}
ircd::m::event::id::buf
ircd::m::redact(const room &room,
const id::user &sender,
const id::event &event_id,
const string_view &reason)
{
json::iov event;
const json::iov::push push[]
{
{ event, { "type", "m.room.redaction" }},
{ event, { "sender", sender }},
{ event, { "redacts", event_id }},
};
json::iov content;
const json::iov::set _reason
{
content, !empty(reason),
{
"reason", [&reason]() -> json::value
{
return reason;
}
}
};
return commit(room, event, content);
}
ircd::m::event::id::buf
ircd::m::notice(const room &room,
const string_view &body)
{
return message(room, me(), body, "m.notice");
}
ircd::m::event::id::buf
ircd::m::notice(const room &room,
const m::id::user &sender,
const string_view &body)
{
return message(room, sender, body, "m.notice");
}
ircd::m::event::id::buf
ircd::m::msghtml(const room &room,
const m::id::user &sender,
const string_view &html,
const string_view &alt,
const string_view &msgtype)
{
return message(room, sender,
{
{ "msgtype", msgtype },
{ "format", "org.matrix.custom.html" },
{ "body", { alt?: html, json::STRING } },
{ "formatted_body", { html, json::STRING } },
});
}
ircd::m::event::id::buf
ircd::m::message(const room &room,
const m::id::user &sender,
const string_view &body,
const string_view &msgtype)
{
return message(room, sender,
{
{ "body", { body, json::STRING } },
{ "msgtype", { msgtype, json::STRING } },
});
}
ircd::m::event::id::buf
ircd::m::message(const room &room,
const m::id::user &sender,
const json::members &contents)
{
return send(room, sender, "m.room.message", contents);
}
ircd::m::event::id::buf
ircd::m::annotate(const room &room,
const id::user &sender,
const id::event &target,
const string_view &key)
{
json::iov relates;
const json::iov::push push
{
relates, { "key", key },
};
return react(room, sender, target, "m.annotation", relates);
}
ircd::m::event::id::buf
ircd::m::react(const room &room,
const id::user &sender,
const id::event &target,
const string_view &rel_type,
json::iov &relates)
{
json::iov content;
thread_local char buf[event::MAX_SIZE];
const json::iov::push push[]
{
{ relates, { "event_id", target }},
{ relates, { "rel_type", rel_type }},
{ content, { "m.relates_to", stringify(mutable_buffer{buf}, relates) }},
};
return send(room, sender, "m.reaction", content);
}
#pragma GCC diagnostic push
#pragma GCC diagnostic ignored "-Wstack-usage="
ircd::m::event::id::buf
__attribute__((stack_protect))
ircd::m::send(const room &room,
const m::id::user &sender,
const string_view &type,
const string_view &state_key,
const json::members &contents)
{
const size_t contents_count
{
std::min(contents.size(), json::object::max_sorted_members)
};
json::iov _content;
json::iov::push content[contents_count]; // 48B each
return send(room, sender, type, state_key, make_iov(_content, content, contents_count, contents));
}
#pragma GCC diagnostic pop
#pragma GCC diagnostic push
#pragma GCC diagnostic ignored "-Wstack-usage="
ircd::m::event::id::buf
__attribute__((stack_protect))
ircd::m::send(const room &room,
const m::id::user &sender,
const string_view &type,
const string_view &state_key,
const json::object &contents)
{
const size_t contents_count
{
std::min(contents.size(), json::object::max_sorted_members)
};
json::iov _content;
json::iov::push content[contents_count]; // 48B each
return send(room, sender, type, state_key, make_iov(_content, content, contents_count, contents));
}
#pragma GCC diagnostic pop
ircd::m::event::id::buf
ircd::m::send(const room &room,
const m::id::user &sender,
const string_view &type,
const string_view &state_key,
const json::iov &content)
{
json::iov event;
const json::iov::push push[]
{
{ event, { "sender", sender }},
{ event, { "type", type }},
{ event, { "state_key", state_key }},
};
return commit(room, event, content);
}
#pragma GCC diagnostic push
#pragma GCC diagnostic ignored "-Wstack-usage="
ircd::m::event::id::buf
__attribute__((stack_protect))
ircd::m::send(const room &room,
const m::id::user &sender,
const string_view &type,
const json::members &contents)
{
const size_t contents_count
{
std::min(contents.size(), json::object::max_sorted_members)
};
json::iov _content;
json::iov::push content[contents_count]; // 48B each
return send(room, sender, type, make_iov(_content, content, contents_count, contents));
}
#pragma GCC diagnostic pop
#pragma GCC diagnostic push
#pragma GCC diagnostic ignored "-Wstack-usage="
ircd::m::event::id::buf
__attribute__((stack_protect))
ircd::m::send(const room &room,
const m::id::user &sender,
const string_view &type,
const json::object &contents)
{
const size_t contents_count
{
std::min(contents.size(), json::object::max_sorted_members)
};
json::iov _content;
json::iov::push content[contents_count]; // 48B each
return send(room, sender, type, make_iov(_content, content, contents_count, contents));
}
#pragma GCC diagnostic pop
ircd::m::event::id::buf
ircd::m::send(const room &room,
const id::user &sender,
const string_view &type,
const json::iov &content)
{
json::iov event;
const json::iov::push push[]
{
{ event, { "sender", sender }},
{ event, { "type", type }},
};
return commit(room, event, content);
}
ircd::m::event::id::buf
ircd::m::commit(const room &room,
json::iov &event,
const json::iov &contents)
{
// Set the room_id on the iov
json::iov::push room_id
{
event, { "room_id", room.room_id }
};
vm::copts opts
{
room.copts?
*room.copts:
vm::default_copts
};
// Some functionality on this server may create an event on behalf
// of remote users. It's safe for us to mask this here, but eval'ing
// this event in any replay later will require special casing.
opts.non_conform |= event::conforms::MISMATCH_ORIGIN_SENDER;
// Don't need this here
opts.phase.reset(vm::phase::VERIFY);
return vm::eval
{
event, contents, opts
};
}
ircd::m::id::room::buf
ircd::m::room_id(const id::room_alias &room_alias)
{
char buf[m::id::MAX_SIZE + 1];
static_assert(sizeof(buf) <= 256);
return room_id(buf, room_alias);
}
ircd::m::id::room::buf
ircd::m::room_id(const id::event &event_id)
{
char buf[m::id::MAX_SIZE + 1];
static_assert(sizeof(buf) <= 256);
return room_id(buf, event_id);
}
ircd::m::id::room::buf
ircd::m::room_id(const string_view &mxid)
{
char buf[m::id::MAX_SIZE + 1];
static_assert(sizeof(buf) <= 256);
return room_id(buf, mxid);
}
ircd::m::id::room::buf
ircd::m::room_id(const event::idx &event_idx)
{
char buf[m::id::MAX_SIZE + 1];
static_assert(sizeof(buf) <= 256);
return room_id(buf, event_idx);
}
ircd::m::id::room
ircd::m::room_id(const mutable_buffer &out,
const string_view &mxid)
{
switch(m::sigil(mxid))
{
case id::ROOM:
return id::room{out, mxid};
case id::USER:
{
const m::user::room user_room(mxid);
return string_view
{
data(out), copy(out, user_room.room_id)
};
}
case id::NODE:
{
const m::node node(lstrip(mxid, ':'));
const m::node::room node_room(node);
return string_view
{
data(out), copy(out, node_room.room_id)
};
}
case id::EVENT:
return room_id(out, id::event{mxid});
default:
return room_id(out, id::room_alias{mxid});
}
}
ircd::m::id::room
ircd::m::room_id(const mutable_buffer &out,
const event::idx &event_idx)
try
{
room::id ret;
m::get(event_idx, "room_id", [&out, &ret]
(const room::id &room_id)
{
ret = string_view { data(out), copy(out, room_id) };
});
return ret;
}
catch(const m::NOT_FOUND &e)
{
throw m::NOT_FOUND
{
"resolving room_id from event_idx :%s",
e.what(),
};
}
ircd::m::id::room
ircd::m::room_id(const mutable_buffer &out,
const id::event &event_id)
try
{
room::id ret;
m::get(event_id, "room_id", [&out, &ret]
(const room::id &room_id)
{
ret = string_view { data(out), copy(out, room_id) };
});
return ret;
}
catch(const m::NOT_FOUND &e)
{
throw m::NOT_FOUND
{
"resolving room_id from event_id :%s",
e.what(),
};
}
ircd::m::id::room
ircd::m::room_id(const mutable_buffer &out,
const id::room_alias &room_alias)
try
{
room::id ret;
room::aliases::cache::get(room_alias, [&out, &ret]
(const room::id &room_id)
{
ret = string_view { data(out), copy(out, room_id) };
});
return ret;
}
catch(const m::NOT_FOUND &e)
{
throw m::NOT_FOUND
{
"resolving room_id from alias :%s",
e.what(),
};
}
bool
ircd::m::exists(const id::room_alias &room_alias,
const bool &remote_query)
{
if(room::aliases::cache::has(room_alias))
return true;
if(!remote_query)
return false;
return room::aliases::cache::get(std::nothrow, room_alias, [](const room::id &room_id) {});
}
int64_t
ircd::m::depth(const id::room &room_id)
{
return std::get<int64_t>(top(room_id));
}
int64_t
ircd::m::depth(std::nothrow_t,
const id::room &room_id)
{
const auto it
{
dbs::room_events.begin(room_id)
};
if(!it)
return -1;
const auto part
{
dbs::room_events_key(it->first)
};
return std::get<0>(part);
}
ircd::m::event::idx
ircd::m::head_idx(const id::room &room_id)
{
return std::get<event::idx>(top(room_id));
}
ircd::m::event::idx
ircd::m::head_idx(std::nothrow_t,
const id::room &room_id)
{
const auto it
{
dbs::room_events.begin(room_id)
};
if(!it)
return 0;
const auto part
{
dbs::room_events_key(it->first)
};
return std::get<1>(part);
}
ircd::m::event::id::buf
ircd::m::head(const id::room &room_id)
{
return std::get<event::id::buf>(top(room_id));
}
ircd::m::event::id::buf
ircd::m::head(std::nothrow_t,
const id::room &room_id)
{
return std::get<event::id::buf>(top(std::nothrow, room_id));
}
std::tuple<ircd::m::event::id::buf, int64_t, ircd::m::event::idx>
ircd::m::top(const id::room &room_id)
{
const auto ret
{
top(std::nothrow, room_id)
};
if(std::get<int64_t>(ret) == -1)
throw m::NOT_FOUND
{
"No head for room %s", string_view{room_id}
};
return ret;
}
std::tuple<ircd::m::event::id::buf, int64_t, ircd::m::event::idx>
ircd::m::top(std::nothrow_t,
const id::room &room_id)
{
const auto it
{
dbs::room_events.begin(room_id)
};
if(!it)
return
{
event::id::buf{}, -1, 0
};
const auto part
{
dbs::room_events_key(it->first)
};
const int64_t &depth
{
int64_t(std::get<0>(part))
};
const event::idx &event_idx
{
std::get<1>(part)
};
std::tuple<event::id::buf, int64_t, event::idx> ret
{
event::id::buf{}, depth, event_idx
};
m::event_id(std::nothrow, event_idx, [&ret]
(const event::id &event_id)
{
std::get<event::id::buf>(ret) = event_id;
});
return ret;
}
ircd::m::id::user::buf
ircd::m::any_user(const room &room,
const string_view &host,
const string_view &membership)
{
user::id::buf ret;
const room::members members{room};
members.for_each(membership, [&host, &ret]
(const auto &user_id, const auto &event_idx)
{
if(host && user_id.host() != host)
return true;
ret = user_id;
return false;
});
return ret;
}
/// Receive the join_rule of the room into buffer of sufficient size.
/// The protocol does not specify a join_rule string longer than 7
/// characters but do be considerate of the future. This function
/// properly defaults the string as per the protocol spec.
ircd::string_view
ircd::m::join_rule(const mutable_buffer &out,
const room &room)
{
static const string_view default_join_rule
{
"invite"
};
string_view ret
{
default_join_rule
};
const event::keys::include keys
{
"content"
};
const m::event::fetch::opts fopts
{
keys, room.fopts? room.fopts->gopts : db::gopts{}
};
const room::state state
{
room, &fopts
};
state.get(std::nothrow, "m.room.join_rules", "", [&ret, &out]
(const m::event &event)
{
const auto &content
{
json::get<"content"_>(event)
};
const json::string &rule
{
content.get("join_rule", default_join_rule)
};
ret = string_view
{
data(out), copy(out, rule)
};
});
return ret;
}
ircd::string_view
ircd::m::version(const mutable_buffer &buf,
const room &room)
{
const auto ret
{
version(buf, room, std::nothrow)
};
if(!ret)
throw m::NOT_FOUND
{
"Failed to find room %s to query its version",
string_view{room.room_id}
};
return ret;
}
ircd::string_view
ircd::m::version(const mutable_buffer &buf,
const room &room,
std::nothrow_t)
{
const auto event_idx
{
room.get(std::nothrow, "m.room.create", "")
};
string_view ret
{
strlcpy{buf, "1"_sv}
};
m::get(std::nothrow, event_idx, "content", [&buf, &ret]
(const json::object &content)
{
const json::string &version
{
content.get("room_version", "1")
};
ret = strlcpy
{
buf, version
};
});
return ret;
}
ircd::string_view
ircd::m::type(const mutable_buffer &buf,
const room &room)
{
string_view ret;
const auto event_idx
{
room.get(std::nothrow, "m.room.create", "")
};
m::get(std::nothrow, event_idx, "content", [&buf, &ret]
(const json::object &content)
{
const json::string &type
{
content.get("type")
};
ret = strlcpy
{
buf, type
};
});
return ret;
}
ircd::m::id::user::buf
ircd::m::creator(const id::room &room_id)
{
// Query the sender field of the event to get the creator. This is for
// future compatibility if the content.creator field gets eliminated.
static const event::fetch::opts fopts
{
event::keys::include {"sender"}
};
const room::state state
{
room_id, &fopts
};
id::user::buf ret;
state.get("m.room.create", "", [&ret]
(const m::event &event)
{
ret = user::id
{
json::get<"sender"_>(event)
};
});
return ret;
}
//
// boolean suite
//
/// The only members are from our origin, in any membership state. This
/// indicates we won't have any other federation servers that could possibly
/// be party to anything about this room.
bool
ircd::m::local_only(const room &room)
{
// Branch to test if any remote users are joined to the room, meaning
// this result must be false; this is a fast query.
if(remote_joined(room))
return false;
const room::members members
{
room
};
return members.for_each([]
(const id::user &user_id)
{
return my(user_id);
});
}
/// Member(s) from our server are presently joined to the room. Returns false
/// if there's a room on the server where all of our users have left. Note that
/// some internal rooms have no memberships at all and this will also be false.
/// This can return true if other servers have memberships in the room too, as
/// long as one of our users is joined.
bool
ircd::m::local_joined(const room &room)
{
const room::members members
{
room
};
return !for_each([&members]
(const homeserver &homeserver)
{
// return false to break and return false; true to continue
return members.empty("join", origin(homeserver));
});
}
/// Member(s) from another server are presently joined to the room. For example
/// if another user leaves a PM with our user who is still joined, this returns
/// false. This can return true even if the room has no memberships in any
/// state from our server, as long as there's a joined member from a remote.
bool
ircd::m::remote_joined(const room &room)
{
const room::members members
{
room
};
return !members.for_each("join", []
(const id::user &user_id)
{
return my(user_id)? true : false; // false to break.
});
}
bool
ircd::m::visible(const room &room,
const string_view &mxid,
const event *const &event)
{
if(event)
return m::visible(*event, mxid);
const m::event event_
{
json::members
{
{ "event_id", room.event_id },
{ "room_id", room.room_id },
}
};
return m::visible(event_, mxid);
}
/// Test of the join_rule of the room is the argument.
bool
ircd::m::join_rule(const room &room,
const string_view &rule)
{
char buf[32];
return join_rule(buf, room) == rule;
}
bool
ircd::m::creator(const room::id &room_id,
const user::id &user_id)
{
const auto creator_user_id
{
creator(room_id)
};
return creator_user_id == user_id;
}
bool
ircd::m::federated(const id::room &room_id)
{
static const m::event::fetch::opts fopts
{
event::keys::include { "content" },
};
const m::room::state state
{
room_id, &fopts
};
bool ret;
state.get("m.room.create", "", [&ret]
(const m::event &event)
{
ret = json::get<"content"_>(event).get("m.federate", true);
});
return ret;
}
/// Determine if this is an internal room. The following must be satisfied:
///
/// - The room was created by this origin.
/// - The creator was the server itself, not any other user.
bool
ircd::m::internal(const id::room &room_id)
{
const m::room room
{
room_id
};
if(!my(room))
return false;
if(!exists(room))
return false;
if(!creator(room, me()))
return false;
return true;
}
bool
ircd::m::exists(const id::room &room_id)
{
const m::room::events it
{
room_id, 0UL
};
if(!it)
return false;
if(likely(it.depth() < 2UL))
return true;
if(my_host(room_id.host()) && creator(room_id, me()))
return true;
return false;
}
bool
ircd::m::exists(const room &room)
{
return exists(room.room_id);
}
//
// util
//
bool
ircd::m::operator==(const room &a, const room &b)
{
return !(a != b);
}
bool
ircd::m::operator!=(const room &a_, const room &b_)
{
const string_view &a{a_.room_id}, &b{b_.room_id};
return a != b;
}
bool
ircd::m::operator!(const room &a)
{
return !a.room_id;
}
bool
ircd::m::my(const room &room)
{
return my(room.room_id);
}
//
// room
//
/// A room index is just the event::idx of its create event.
ircd::m::event::idx
ircd::m::room::index(const room::id &room_id)
{
const auto ret
{
index(room_id, std::nothrow)
};
if(!ret)
throw m::NOT_FOUND
{
"No index for room %s", string_view{room_id}
};
return ret;
}
ircd::m::event::idx
ircd::m::room::index(const room::id &room_id,
std::nothrow_t)
{
uint64_t depth{0};
room::events it
{
room_id, depth
};
return it? it.event_idx() : 0;
}
//
// room::room
//
size_t
ircd::m::room::count()
const
{
size_t ret(0);
for_each(event::closure_idx_bool{[&ret]
(const event::idx &event_idx)
{
++ret;
return true;
}});
return ret;
}
size_t
ircd::m::room::count(const string_view &type)
const
{
size_t ret(0);
for_each(type, event::closure_idx_bool{[&ret]
(const event::idx &event_idx)
{
++ret;
return true;
}});
return ret;
}
size_t
ircd::m::room::count(const string_view &type,
const string_view &state_key)
const
{
size_t ret(0);
for_each(type, event::closure_idx_bool{[&state_key, &ret]
(const event::idx &event_idx)
{
ret += query(std::nothrow, event_idx, "state_key", [&state_key]
(const string_view &_state_key) -> bool
{
return state_key == _state_key;
});
return true;
}});
return ret;
}
bool
ircd::m::room::has(const string_view &type)
const
{
return get(std::nothrow, type, event::closure{});
}
void
ircd::m::room::get(const string_view &type,
const event::closure &closure)
const
{
if(!get(std::nothrow, type, closure))
throw m::NOT_FOUND
{
"No events of type '%s' found in '%s'",
type,
room_id
};
}
bool
ircd::m::room::get(std::nothrow_t,
const string_view &type,
const event::closure &closure)
const
{
bool ret{false};
for_each(type, event::closure_bool{[&ret, &closure]
(const event &event)
{
if(closure)
closure(event);
ret = true;
return false;
}});
return ret;
}
ircd::m::event::idx
ircd::m::room::get(const string_view &type)
const
{
const event::idx ret
{
get(std::nothrow, type)
};
if(unlikely(!ret))
throw m::NOT_FOUND
{
"No events of type '%s' found in '%s'",
type,
room_id
};
return ret;
}
ircd::m::event::idx
ircd::m::room::get(std::nothrow_t,
const string_view &type)
const
{
event::idx ret{0};
for_each(type, event::closure_idx_bool{[&ret]
(const event::idx &event_idx)
{
ret = event_idx;
return false;
}});
return ret;
}
ircd::m::event::idx
ircd::m::room::get(const string_view &type,
const string_view &state_key)
const
{
return state(*this).get(type, state_key);
}
ircd::m::event::idx
ircd::m::room::get(std::nothrow_t,
const string_view &type,
const string_view &state_key)
const
{
return state(*this).get(std::nothrow, type, state_key);
}
void
ircd::m::room::get(const string_view &type,
const string_view &state_key,
const event::closure &closure)
const
{
const state state{*this};
state.get(type, state_key, closure);
}
bool
ircd::m::room::get(std::nothrow_t,
const string_view &type,
const string_view &state_key,
const event::closure &closure)
const
{
const state state{*this};
return state.get(std::nothrow, type, state_key, closure);
}
bool
ircd::m::room::has(const string_view &type,
const string_view &state_key)
const
{
const state state{*this};
return state.has(type, state_key);
}
void
ircd::m::room::for_each(const event::closure &closure)
const
{
for_each(string_view{}, closure);
}
bool
ircd::m::room::for_each(const event::closure_bool &closure)
const
{
return for_each(string_view{}, closure);
}
void
ircd::m::room::for_each(const event::id::closure &closure)
const
{
for_each(string_view{}, closure);
}
bool
ircd::m::room::for_each(const event::id::closure_bool &closure)
const
{
return for_each(string_view{}, closure);
}
void
ircd::m::room::for_each(const event::closure_idx &closure)
const
{
for_each(string_view{}, closure);
}
bool
ircd::m::room::for_each(const event::closure_idx_bool &closure)
const
{
return for_each(string_view{}, closure);
}
void
ircd::m::room::for_each(const string_view &type,
const event::closure &closure)
const
{
for_each(type, event::closure_bool{[&closure]
(const event &event)
{
closure(event);
return true;
}});
}
bool
ircd::m::room::for_each(const string_view &type,
const event::closure_bool &closure)
const
{
event::fetch event
{
fopts? *fopts : event::fetch::default_opts
};
return for_each(type, event::closure_idx_bool{[&closure, &event]
(const event::idx &event_idx)
{
if(!seek(std::nothrow, event, event_idx))
return true;
return closure(event);
}});
}
void
ircd::m::room::for_each(const string_view &type,
const event::id::closure &closure)
const
{
for_each(type, event::id::closure_bool{[&closure]
(const event::id &event_id)
{
closure(event_id);
return true;
}});
}
bool
ircd::m::room::for_each(const string_view &type,
const event::id::closure_bool &closure)
const
{
return for_each(type, event::closure_idx_bool{[&closure]
(const event::idx &idx)
{
bool ret{true};
m::event_id(std::nothrow, idx, [&ret, &closure]
(const event::id &event_id)
{
ret = closure(event_id);
});
return ret;
}});
}
void
ircd::m::room::for_each(const string_view &type,
const event::closure_idx &closure)
const
{
for_each(type, event::closure_idx_bool{[&closure]
(const event::idx &idx)
{
closure(idx);
return true;
}});
}
bool
ircd::m::room::for_each(const string_view &type,
const event::closure_idx_bool &closure)
const
{
static constexpr auto idx
{
json::indexof<event, "type"_>()
};
auto &column
{
dbs::event_column.at(idx)
};
events it{*this};
for(; it; --it)
{
const auto &event_idx
{
it.event_idx()
};
bool match
{
empty(type) // allow empty type to always match and bypass query
};
if(!match)
column(byte_view<string_view>(event_idx), std::nothrow, [&match, &type]
(const string_view &value)
{
match = value == type;
});
if(match)
if(!closure(event_idx))
return false;
}
return true;
}