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construct/matrix/room_aliases.cc

588 lines
9.8 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.
namespace ircd::m
{
extern conf::item<seconds> alias_fetch_timeout;
extern conf::item<seconds> alias_cache_ttl;
}
decltype(ircd::m::alias_cache_ttl)
ircd::m::alias_cache_ttl
{
{ "name", "ircd.m.room.aliases.cache.ttl" },
{ "default", 604800L },
};
decltype(ircd::m::alias_fetch_timeout)
ircd::m::alias_fetch_timeout
{
{ "name", "ircd.m.room.aliases.fetch.timeout" },
{ "default", 10L },
};
//
// m::room::aliases
//
size_t
ircd::m::room::aliases::count()
const
{
return count(string_view{});
}
size_t
ircd::m::room::aliases::count(const string_view &server)
const
{
size_t ret(0);
for_each(server, [&ret](const auto &a)
{
++ret;
return true;
});
return ret;
}
bool
ircd::m::room::aliases::has(const alias &alias)
const
{
return !for_each(alias.host(), [&alias]
(const id::room_alias &a)
{
assert(a.host() == alias.host());
return a == alias? false : true; // false to break on found
});
}
bool
ircd::m::room::aliases::for_each(const closure_bool &closure)
const
{
const room::state state
{
room
};
return state.for_each("m.room.aliases", [this, &closure]
(const string_view &type, const string_view &state_key, const event::idx &)
{
return for_each(state_key, closure);
});
}
bool
ircd::m::room::aliases::for_each(const string_view &server,
const closure_bool &closure)
const
{
if(!server)
return for_each(closure);
return for_each(room, server, closure);
}
bool
ircd::m::room::aliases::for_each(const m::room &room,
const string_view &server,
const closure_bool &closure)
{
const room::state state
{
room
};
assert(server);
const event::idx &event_idx
{
state.get(std::nothrow, "m.room.aliases", server)
};
if(!event_idx)
return true;
bool ret{true};
m::get(std::nothrow, event_idx, "content", [&closure, &ret]
(const json::object &content)
{
const json::array &aliases
{
content["aliases"]
};
for(auto it(begin(aliases)); it != end(aliases) && ret; ++it)
{
const json::string &alias(*it);
if(!valid(m::id::ROOM_ALIAS, alias))
continue;
if(!closure(alias))
ret = false;
}
});
return ret;
}
//
// m::room::aliases::cache
//
bool
ircd::m::room::aliases::cache::del(const alias &alias)
{
char buf[m::id::room_alias::buf::SIZE];
const string_view &key
{
make_key(buf, alias)
};
const m::room::id::buf alias_room_id
{
"alias", origin(my())
};
const m::room alias_room
{
alias_room_id
};
const auto &event_idx
{
alias_room.get(std::nothrow, "ircd.room.alias", key)
};
if(!event_idx)
return false;
const auto event_id
{
m::event_id(std::nothrow, event_idx)
};
if(!event_id)
return false;
const auto ret
{
redact(alias_room, me(), event_id, "deleted")
};
return true;
}
bool
ircd::m::room::aliases::cache::set(const alias &alias,
const id &id)
{
char buf[m::id::room_alias::buf::SIZE];
const string_view &key
{
make_key(buf, alias)
};
const m::room::id::buf alias_room_id
{
"alias", origin(my())
};
const m::room alias_room
{
alias_room_id
};
const auto ret
{
send(alias_room, me(), "ircd.room.alias", key,
{
{ "room_id", id }
})
};
return true;
}
bool
ircd::m::room::aliases::cache::get(std::nothrow_t,
const alias &alias,
const id::closure &closure)
{
m::event::idx event_idx
{
getidx(alias)
};
const bool expired
{
!my_host(alias.host()) && (!event_idx || cache::expired(event_idx))
};
if(!event_idx || expired)
{
if(my_host(alias.host()))
return false;
if(expired)
log::dwarning
{
log, "Cached alias %s expired age:%ld ttl:%ld",
string_view{alias},
cache::age(event_idx).count(),
milliseconds(seconds(alias_cache_ttl)).count(),
};
if(!fetch(std::nothrow, alias, alias.host()))
return false;
if(!(event_idx = getidx(alias)))
return false;
}
bool ret{false};
m::get(std::nothrow, event_idx, "content", [&closure, &ret]
(const json::object &content)
{
const json::string &room_id
{
content.get("room_id")
};
if(!empty(room_id))
{
ret = true;
closure(room_id);
}
});
return ret;
}
bool
ircd::m::room::aliases::cache::fetch(std::nothrow_t,
const alias &a,
const string_view &remote)
try
{
fetch(a, remote);
return true;
}
catch(const std::exception &e)
{
log::error
{
log, "Failed to fetch room_id for %s from %s :%s",
string_view{a},
remote,
e.what(),
};
return false;
}
ircd::m::room::id::buf
ircd::m::room::aliases::cache::get(const alias &a)
{
id::buf ret;
get(a, [&ret]
(const id &room_id)
{
ret = room_id;
});
return ret;
}
ircd::m::room::id::buf
ircd::m::room::aliases::cache::get(std::nothrow_t,
const alias &a)
{
id::buf ret;
get(std::nothrow, a, [&ret]
(const id &room_id)
{
ret = room_id;
});
return ret;
}
void
ircd::m::room::aliases::cache::get(const alias &a,
const id::closure &c)
{
if(!get(std::nothrow, a, c))
throw m::NOT_FOUND
{
"Cannot find room_id for %s",
string_view{a}
};
}
bool
ircd::m::room::aliases::cache::for_each(const closure_bool &c)
{
return for_each(string_view{}, c);
}
void
ircd::m::room::aliases::cache::fetch(const alias &alias,
const string_view &remote)
try
{
const unique_buffer<mutable_buffer> buf
{
16_KiB
};
m::fed::query::opts opts;
opts.remote = remote;
opts.dynamic = false;
m::fed::query::directory request
{
alias, buf, std::move(opts)
};
const http::code &code
{
request.get(seconds(alias_fetch_timeout))
};
const json::object response
{
request
};
const json::string &room_id
{
response["room_id"]
};
if(!valid(m::id::ROOM, room_id))
throw m::NOT_FOUND
{
"Server '%s' does not know room_id for %s",
remote,
string_view{alias},
};
set(alias, m::id::room(room_id));
}
catch(const ctx::timeout &e)
{
throw m::error
{
http::GATEWAY_TIMEOUT, "M_ROOM_ALIAS_TIMEOUT",
"Server '%s' did not respond with a room_id for %s in time",
remote,
string_view{alias},
};
}
catch(const server::unavailable &e)
{
throw m::error
{
http::BAD_GATEWAY, "M_ROOM_ALIAS_UNAVAILABLE",
"Server '%s' is not available to query a room_id for %s",
remote,
string_view{alias},
};
}
bool
ircd::m::room::aliases::cache::for_each(const string_view &server,
const closure_bool &closure)
{
const m::room::id::buf alias_room_id
{
"alias", origin(my())
};
const m::room::state state
{
alias_room_id
};
bool ret{true};
const m::room::state::closure_bool reclosure{[&server, &closure, &ret]
(const string_view &type, const string_view &state_key, const m::event::idx &event_idx)
{
thread_local char swapbuf[m::id::room_alias::buf::SIZE];
const alias &alias
{
m::id::unswap(state_key, swapbuf)
};
if(server && alias.host() != server)
return false;
if(expired(event_idx))
return true;
m::get(std::nothrow, event_idx, "content", [&closure, &ret, &alias]
(const json::object &content)
{
const json::string &room_id
{
content.get("room_id")
};
if(!empty(room_id))
ret = closure(alias, room_id);
});
return ret;
}};
state.for_each("ircd.room.alias", server, reclosure);
return ret;
}
bool
ircd::m::room::aliases::cache::has(const alias &alias)
{
const auto &event_idx
{
getidx(alias)
};
if(!event_idx)
return false;
if(expired(event_idx))
return false;
bool ret{false};
m::get(std::nothrow, event_idx, "content", [&ret]
(const json::object &content)
{
const json::string &room_id
{
content.get("room_id")
};
ret = !empty(room_id);
});
return ret;
}
ircd::system_point
ircd::m::room::aliases::cache::expires(const alias &alias)
{
const auto event_idx
{
getidx(alias)
};
if(!event_idx)
return system_point::min();
const milliseconds age
{
cache::age(event_idx)
};
const seconds ttl
{
alias_cache_ttl
};
return now<system_point>() + (ttl - age);
}
bool
ircd::m::room::aliases::cache::expired(const event::idx &event_idx)
{
const milliseconds age
{
cache::age(event_idx)
};
const seconds ttl
{
alias_cache_ttl
};
return age > ttl;
}
ircd::milliseconds
ircd::m::room::aliases::cache::age(const event::idx &event_idx)
{
time_t ts;
if(!m::get(event_idx, "origin_server_ts", ts))
return milliseconds::max();
const time_t now
{
ircd::time<milliseconds>()
};
return milliseconds
{
now - ts
};
}
ircd::m::event::idx
ircd::m::room::aliases::cache::getidx(const alias &alias)
{
thread_local char swapbuf alignas(16) [m::id::room_alias::buf::SIZE];
const string_view &swapped
{
alias.swap(swapbuf)
};
char buf[m::id::room_alias::buf::SIZE];
const string_view &key
{
tolower(buf, swapped)
};
const m::room::id::buf alias_room_id
{
"alias", origin(my())
};
const m::room alias_room
{
alias_room_id
};
const auto &event_idx
{
alias_room.get(std::nothrow, "ircd.room.alias", key)
};
return event_idx;
}
ircd::string_view
ircd::m::room::aliases::cache::make_key(const mutable_buffer &out,
const alias &alias)
{
thread_local char swapbuf alignas(16) [m::id::room_alias::buf::SIZE];
const string_view &swapped
{
alias.swap(swapbuf)
};
const string_view &key
{
tolower(out, swapped)
};
return key;
}