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construct/modules/db/events.cc

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C++

/*
* Copyright (C) 2017 Charybdis Development Team
* Copyright (C) 2017 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.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
using namespace ircd;
const database::descriptor events_event_id_descriptor
{
// name
"event_id",
// explanation
R"(### protocol note:
10.1
The id of event.
10.4
MUST NOT exceed 255 bytes.
### developer note:
key is event_id. This is redundant data but we have to have it for now.
)",
// typing (key, value)
{
typeid(string_view), typeid(string_view)
}
};
const database::descriptor events_type_descriptor
{
// name
"type",
// explanation
R"(### protocol note:
10.1
The type of event. This SHOULD be namespaced similar to Java package naming conventions
e.g. 'com.example.subdomain.event.type'.
10.4
MUST NOT exceed 255 bytes.
### developer note:
key is event_id
)",
// typing (key, value)
{
typeid(string_view), typeid(string_view)
}
};
const database::descriptor events_content_descriptor
{
// name
"content",
// explanation
R"(### protocol note:
10.1
The fields in this object will vary depending on the type of event. When interacting
with the REST API, this is the HTTP body.
### developer note:
Since events must not exceed 65 KB the maximum size for the content is the remaining
space after all the other fields for the event are rendered.
key is event_id
)",
// typing (key, value)
{
typeid(string_view), typeid(string_view)
}
};
const database::descriptor events_room_id_descriptor
{
// name
"room_id",
// explanation
R"(### protocol note:
10.2 (apropos room events)
Required. The ID of the room associated with this event.
10.4
MUST NOT exceed 255 bytes.
### developer note:
key is event_id
)",
// typing (key, value)
{
typeid(string_view), typeid(string_view)
}
};
const database::descriptor events_sender_descriptor
{
// name
"sender",
// explanation
R"(### protocol note:
10.2 (apropos room events)
Required. Contains the fully-qualified ID of the user who sent this event.
10.4
MUST NOT exceed 255 bytes.
### developer note:
key is event_id
)",
// typing (key, value)
{
typeid(string_view), typeid(string_view)
}
};
const database::descriptor events_state_key_descriptor
{
// name
"state_key",
// explanation
R"(### protocol note:
10.3 (apropos room state events)
A unique key which defines the overwriting semantics for this piece of room state.
This value is often a zero-length string. The presence of this key makes this event a
State Event. The key MUST NOT start with '_'.
10.4
MUST NOT exceed 255 bytes.
### developer note:
key is event_id
)",
// typing (key, value)
{
typeid(string_view), typeid(string_view)
}
};
const database::descriptor events_origin_descriptor
{
// name
"origin",
// explanation
R"(### protocol note:
FEDERATION 4.1
DNS name of homeserver that created this PDU
### developer note:
key is event_id
)",
// typing (key, value)
{
typeid(string_view), typeid(string_view)
}
};
const database::descriptor events_origin_server_ts_descriptor
{
// name
"origin_server_ts",
// explanation
R"(### protocol note:
FEDERATION 4.1
Timestamp in milliseconds on origin homeserver when this PDU was created.
### developer note:
key is event_id
value is a machine integer (binary)
TODO: consider unsigned rather than time_t because of millisecond precision
)",
// typing (key, value)
{
typeid(string_view), typeid(time_t)
}
};
const database::descriptor events_unsigned_descriptor
{
// name
"unsigned",
// explanation
R"(### protocol note:
### developer note:
key is event_id
)",
// typing (key, value)
{
typeid(string_view), typeid(string_view)
}
};
const database::descriptor events_signatures_descriptor
{
// name
"signatures",
// explanation
R"(### protocol note:
### developer note:
key is event_id
)",
// typing (key, value)
{
typeid(string_view), typeid(string_view)
}
};
const database::descriptor events_auth_events_descriptor
{
// name
"auth_events",
// explanation
R"(### protocol note:
### developer note:
key is event_id.
)",
// typing (key, value)
{
typeid(string_view), typeid(string_view)
}
};
const database::descriptor events_depth_descriptor
{
// name
"depth",
// explanation
R"(### protocol note:
### developer note:
key is event_id value is long integer
)",
// typing (key, value)
{
typeid(string_view), typeid(int64_t)
}
};
const database::descriptor events_hashes_descriptor
{
// name
"hashes",
// explanation
R"(### protocol note:
### developer note:
key is event_id.
)",
// typing (key, value)
{
typeid(string_view), typeid(string_view)
}
};
const database::descriptor events_membership_descriptor
{
// name
"membership",
// explanation
R"(### protocol note:
### developer note:
key is event_id.
)",
// typing (key, value)
{
typeid(string_view), typeid(string_view)
}
};
const database::descriptor events_prev_events_descriptor
{
// name
"prev_events",
// explanation
R"(### protocol note:
### developer note:
key is event_id.
)",
// typing (key, value)
{
typeid(string_view), typeid(string_view)
}
};
const database::descriptor events_prev_state_descriptor
{
// name
"prev_state",
// explanation
R"(### protocol note:
### developer note:
key is event_id.
)",
// typing (key, value)
{
typeid(string_view), typeid(string_view)
}
};
/// prefix transform for event_id suffixes
///
/// This transform expects a concatenation ending with an event_id which means
/// the prefix can be the same for multiple event_id's; therefor we can find
/// or iterate "event_id in X" where X is some key like a room_id
///
const ircd::db::prefix_transform event_id_in
{
"event_id in",
[](const string_view &key)
{
return key.find('$') != key.npos;
},
[](const string_view &key)
{
return rsplit(key, '$').first;
}
};
const database::descriptor event_id_in_sender
{
// name
"event_id in sender",
// explanation
R"(### developer note:
key is "@sender$event_id"
the prefix transform is in effect. this column indexes events by
sender offering an iterable bound of the index prefixed by sender
)",
// typing (key, value)
{
typeid(string_view), typeid(string_view)
},
// options
{},
// comparator
{},
// prefix transform
event_id_in,
};
const database::descriptor event_id_in_room_id
{
// name
"event_id in room_id",
// explanation
R"(### developer note:
key is "!room_id$event_id"
the prefix transform is in effect. this column indexes events by
room_id offering an iterable bound of the index prefixed by room_id
)",
// typing (key, value)
{
typeid(string_view), typeid(string_view)
},
// options
{},
// comparator - sorts from highest to lowest
{}, //ircd::db::reverse_cmp_string_view{},
// prefix transform
event_id_in,
};
/// prefix transform for origin in
///
/// This transform expects a concatenation ending with an origin which means
/// the prefix can be the same for multiple origins; therefor we can find
/// or iterate "origin in X" where X is some repeated prefix
///
/// TODO: strings will have character conflicts. must address
const ircd::db::prefix_transform origin_in
{
"origin in",
[](const string_view &key)
{
return has(key, ":::");
//return key.find(':') != key.npos;
},
[](const string_view &key)
{
return split(key, ":::").first;
//return rsplit(key, ':').first;
}
};
const database::descriptor origin_in_room_id
{
// name
"origin in room_id",
// explanation
R"(### developer note:
key is "!room_id:origin"
the prefix transform is in effect. this column indexes origins in a
room_id offering an iterable bound of the index prefixed by room_id
)",
// typing (key, value)
{
typeid(string_view), typeid(string_view)
},
// options
{},
// comparator - sorts from highest to lowest
{}, //ircd::db::reverse_cmp_string_view{},
// prefix transform
origin_in,
};
/// prefix transform for room_id
///
/// This transform expects a concatenation ending with a room_id which means
/// the prefix can be the same for multiple room_id's; therefor we can find
/// or iterate "room_id in X" where X is some repeated prefix
///
const ircd::db::prefix_transform room_id_in
{
"room_id in",
[](const string_view &key)
{
return key.find('!') != key.npos;
},
[](const string_view &key)
{
return rsplit(key, '!').first;
}
};
const database::descriptor event_id_for_room_id_in_sender
{
// name
"event_id for room_id in sender",
// explanation
R"(### developer note:
)",
// typing (key, value)
{
typeid(string_view), typeid(string_view)
},
// options
{},
// comparator
{},
// prefix transform
room_id_in,
};
/// prefix transform for type,state_key in room_id
///
/// This transform is special for concatenating room_id with type and state_key
/// in that order with prefix being the room_id (this may change to room_id+
/// type
///
/// TODO: arbitrary type strings will have character conflicts. must address
/// TODO: with grammars.
const ircd::db::prefix_transform type_state_key_in_room_id
{
"type,state_key in room_id",
[](const string_view &key)
{
return key.find("..") != key.npos;
},
[](const string_view &key)
{
return split(key, "..").first;
}
};
const database::descriptor event_id_for_type_state_key_in_room_id
{
// name
"event_id for type,state_key in room_id",
// explanation
R"(### developer note:
)",
// typing (key, value)
{
typeid(string_view), typeid(string_view)
},
// options
{},
// comparator
{},
// prefix transform
type_state_key_in_room_id
};
const database::descriptor prev_event_id_for_event_id_in_room_id
{
// name
"prev_event_id for event_id in room_id",
// explanation
R"(### developer note:
)",
// typing (key, value)
{
typeid(string_view), typeid(string_view)
},
// options
{},
// comparator
{},
// prefix transform
event_id_in
};
/// prefix transform for event_id in room_id,type,state_key
///
/// This transform is special for concatenating room_id with type and state_key
/// and event_id in that order with prefix being the room_id,type,state_key. This
/// will index multiple event_ids with the same type,state_key in a room which
/// allows for a temporal depth to the database; event_id for type,state_key only
/// resolves to a single latest event and overwrites itself as per the room state
/// algorithm whereas this can map all of them and then allows for tracing.
///
/// TODO: arbitrary type strings will have character conflicts. must address
/// TODO: with grammars.
const ircd::db::prefix_transform event_id_in_room_id_type_state_key
{
"event_id in room_id,type_state_key",
[](const string_view &key)
{
return has(key, '$');
},
[](const string_view &key)
{
return split(key, '$').first;
}
};
const database::descriptor prev_event_id_for_type_state_key_event_id_in_room_id
{
// name
"prev_event_id for type,state_key,event_id in room_id",
// explanation
R"(### developer note:
)",
// typing (key, value)
{
typeid(string_view), typeid(string_view)
},
// options
{},
// comparator
{},
// prefix transform
event_id_in_room_id_type_state_key
};
const database::description events_description
{
{ "default" },
// These columns directly represent event fields indexed by event_id and
// the value is the actual event values. Some values may be JSON, like
// content.
events_event_id_descriptor,
events_type_descriptor,
events_content_descriptor,
events_room_id_descriptor,
events_sender_descriptor,
events_state_key_descriptor,
events_origin_descriptor,
events_origin_server_ts_descriptor,
events_unsigned_descriptor,
events_signatures_descriptor,
events_auth_events_descriptor,
events_depth_descriptor,
events_hashes_descriptor,
events_membership_descriptor,
events_prev_events_descriptor,
events_prev_state_descriptor,
// These columns are metadata composed from the event data. Each column has
// a different approach specific to what the query is and value being sought.
// (sender, event_id) => ()
// All events for a sender
// * broad but useful in cases
event_id_in_sender,
// (room_id, event_id) => ()
// All events for a room
// * broad but useful in cases
// * ?eliminate for prev_event?
event_id_in_room_id,
// (room_id, origin) => ()
// All origins for a room
origin_in_room_id,
// (sender, room_id) => (event_id)
// The _last written_ event from a sender in a room
event_id_for_room_id_in_sender,
// (room_id, type, state_key) => (event_id)
// The _last written_ event of type + state_key in a room
// * Proper for room state algorithm, but only works in the present based
// on our subjective tape order.
event_id_for_type_state_key_in_room_id,
// (room_id, event_id) => (prev event_id)
// Events in a room resolving to the previous event in a room in
// our subjective euclidean tape order.
prev_event_id_for_event_id_in_room_id,
// (room_id, type, state_key, event_id) => (prev event_id)
// Events of a (type, state_key) in a room resolving to the previous event
// of (type, state_key) in a room in our subjective euclidean tape order.
prev_event_id_for_type_state_key_event_id_in_room_id,
};
std::shared_ptr<database> events_database
{
std::make_shared<database>("events"s, ""s, events_description)
};
mapi::header IRCD_MODULE
{
"Hosts the 'events' database"
};