dendrite/publicroomsapi/storage/postgres/storage.go

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// Copyright 2017-2018 New Vector Ltd
// Copyright 2019-2020 The Matrix.org Foundation C.I.C.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package postgres
import (
"context"
"database/sql"
"encoding/json"
"github.com/matrix-org/dendrite/common"
"github.com/matrix-org/dendrite/publicroomsapi/types"
"github.com/matrix-org/gomatrixserverlib"
)
// PublicRoomsServerDatabase represents a public rooms server database.
type PublicRoomsServerDatabase struct {
db *sql.DB
common.PartitionOffsetStatements
statements publicRoomsStatements
}
type attributeValue interface{}
// NewPublicRoomsServerDatabase creates a new public rooms server database.
func NewPublicRoomsServerDatabase(dataSourceName string) (*PublicRoomsServerDatabase, error) {
var db *sql.DB
var err error
if db, err = sql.Open("postgres", dataSourceName); err != nil {
return nil, err
}
storage := PublicRoomsServerDatabase{
db: db,
}
if err = storage.PartitionOffsetStatements.Prepare(db, "publicroomsapi"); err != nil {
return nil, err
}
if err = storage.statements.prepare(db); err != nil {
return nil, err
}
return &storage, nil
}
// GetRoomVisibility returns the room visibility as a boolean: true if the room
// is publicly visible, false if not.
// Returns an error if the retrieval failed.
func (d *PublicRoomsServerDatabase) GetRoomVisibility(
ctx context.Context, roomID string,
) (bool, error) {
return d.statements.selectRoomVisibility(ctx, roomID)
}
// SetRoomVisibility updates the visibility attribute of a room. This attribute
// must be set to true if the room is publicly visible, false if not.
// Returns an error if the update failed.
func (d *PublicRoomsServerDatabase) SetRoomVisibility(
ctx context.Context, visible bool, roomID string,
) error {
return d.statements.updateRoomAttribute(ctx, "visibility", visible, roomID)
}
// CountPublicRooms returns the number of room set as publicly visible on the server.
// Returns an error if the retrieval failed.
func (d *PublicRoomsServerDatabase) CountPublicRooms(ctx context.Context) (int64, error) {
return d.statements.countPublicRooms(ctx)
}
// GetPublicRooms returns an array containing the local rooms set as publicly visible, ordered by their number
// of joined members. This array can be limited by a given number of elements, and offset by a given value.
// If the limit is 0, doesn't limit the number of results. If the offset is 0 too, the array contains all
// the rooms set as publicly visible on the server.
// Returns an error if the retrieval failed.
func (d *PublicRoomsServerDatabase) GetPublicRooms(
ctx context.Context, offset int64, limit int16, filter string,
) ([]types.PublicRoom, error) {
return d.statements.selectPublicRooms(ctx, offset, limit, filter)
}
// UpdateRoomFromEvents iterate over a slice of state events and call
// UpdateRoomFromEvent on each of them to update the database representation of
// the rooms updated by each event.
// The slice of events to remove is used to update the number of joined members
// for the room in the database.
// If the update triggered by one of the events failed, aborts the process and
// returns an error.
func (d *PublicRoomsServerDatabase) UpdateRoomFromEvents(
ctx context.Context,
eventsToAdd []gomatrixserverlib.Event,
eventsToRemove []gomatrixserverlib.Event,
) error {
for _, event := range eventsToAdd {
if err := d.UpdateRoomFromEvent(ctx, event); err != nil {
return err
}
}
for _, event := range eventsToRemove {
if event.Type() == "m.room.member" {
if err := d.updateNumJoinedUsers(ctx, event, true); err != nil {
return err
}
}
}
return nil
}
// UpdateRoomFromEvent updates the database representation of a room from a Matrix event, by
// checking the event's type to know which attribute to change and using the event's content
// to define the new value of the attribute.
// If the event doesn't match with any property used to compute the public room directory,
// does nothing.
// If something went wrong during the process, returns an error.
func (d *PublicRoomsServerDatabase) UpdateRoomFromEvent(
ctx context.Context, event gomatrixserverlib.Event,
) error {
// Process the event according to its type
switch event.Type() {
case "m.room.create":
return d.statements.insertNewRoom(ctx, event.RoomID())
case "m.room.member":
return d.updateNumJoinedUsers(ctx, event, false)
case "m.room.aliases":
return d.updateRoomAliases(ctx, event)
case "m.room.canonical_alias":
var content common.CanonicalAliasContent
field := &(content.Alias)
attrName := "canonical_alias"
return d.updateStringAttribute(ctx, attrName, event, &content, field)
case "m.room.name":
var content common.NameContent
field := &(content.Name)
attrName := "name"
return d.updateStringAttribute(ctx, attrName, event, &content, field)
case "m.room.topic":
var content common.TopicContent
field := &(content.Topic)
attrName := "topic"
return d.updateStringAttribute(ctx, attrName, event, &content, field)
case "m.room.avatar":
var content common.AvatarContent
field := &(content.URL)
attrName := "avatar_url"
return d.updateStringAttribute(ctx, attrName, event, &content, field)
case "m.room.history_visibility":
var content common.HistoryVisibilityContent
field := &(content.HistoryVisibility)
attrName := "world_readable"
strForTrue := "world_readable"
return d.updateBooleanAttribute(ctx, attrName, event, &content, field, strForTrue)
case "m.room.guest_access":
var content common.GuestAccessContent
field := &(content.GuestAccess)
attrName := "guest_can_join"
strForTrue := "can_join"
return d.updateBooleanAttribute(ctx, attrName, event, &content, field, strForTrue)
}
// If the event type didn't match, return with no error
return nil
}
// updateNumJoinedUsers updates the number of joined user in the database representation
// of a room using a given "m.room.member" Matrix event.
// If the membership property of the event isn't "join", ignores it and returs nil.
// If the remove parameter is set to false, increments the joined members counter in the
// database, if set to truem decrements it.
// Returns an error if the update failed.
func (d *PublicRoomsServerDatabase) updateNumJoinedUsers(
ctx context.Context, membershipEvent gomatrixserverlib.Event, remove bool,
) error {
membership, err := membershipEvent.Membership()
if err != nil {
return err
}
if membership != gomatrixserverlib.Join {
return nil
}
if remove {
return d.statements.decrementJoinedMembersInRoom(ctx, membershipEvent.RoomID())
}
return d.statements.incrementJoinedMembersInRoom(ctx, membershipEvent.RoomID())
}
// updateStringAttribute updates a given string attribute in the database
// representation of a room using a given string data field from content of the
// Matrix event triggering the update.
// Returns an error if decoding the Matrix event's content or updating the attribute
// failed.
func (d *PublicRoomsServerDatabase) updateStringAttribute(
ctx context.Context, attrName string, event gomatrixserverlib.Event,
content interface{}, field *string,
) error {
if err := json.Unmarshal(event.Content(), content); err != nil {
return err
}
return d.statements.updateRoomAttribute(ctx, attrName, *field, event.RoomID())
}
// updateBooleanAttribute updates a given boolean attribute in the database
// representation of a room using a given string data field from content of the
// Matrix event triggering the update.
// The attribute is set to true if the field matches a given string, false if not.
// Returns an error if decoding the Matrix event's content or updating the attribute
// failed.
func (d *PublicRoomsServerDatabase) updateBooleanAttribute(
ctx context.Context, attrName string, event gomatrixserverlib.Event,
content interface{}, field *string, strForTrue string,
) error {
if err := json.Unmarshal(event.Content(), content); err != nil {
return err
}
var attrValue bool
if *field == strForTrue {
attrValue = true
} else {
attrValue = false
}
return d.statements.updateRoomAttribute(ctx, attrName, attrValue, event.RoomID())
}
// updateRoomAliases decodes the content of a "m.room.aliases" Matrix event and update the list of aliases of
// a given room with it.
// Returns an error if decoding the Matrix event or updating the list failed.
func (d *PublicRoomsServerDatabase) updateRoomAliases(
ctx context.Context, aliasesEvent gomatrixserverlib.Event,
) error {
var content common.AliasesContent
if err := json.Unmarshal(aliasesEvent.Content(), &content); err != nil {
return err
}
return d.statements.updateRoomAttribute(
ctx, "aliases", content.Aliases, aliasesEvent.RoomID(),
)
}