mirror of
https://github.com/1f349/dendrite.git
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122 lines
3.3 KiB
Go
122 lines
3.3 KiB
Go
// Copyright 2017 Vector Creations Ltd
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package storage
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import (
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"context"
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"database/sql"
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"github.com/matrix-org/dendrite/common"
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"github.com/matrix-org/dendrite/federationsender/types"
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)
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// Database stores information needed by the federation sender
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type Database struct {
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joinedHostsStatements
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roomStatements
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common.PartitionOffsetStatements
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db *sql.DB
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}
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// NewDatabase opens a new database
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func NewDatabase(dataSourceName string) (*Database, error) {
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var result Database
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var err error
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if result.db, err = sql.Open("postgres", dataSourceName); err != nil {
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return nil, err
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}
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if err = result.prepare(); err != nil {
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return nil, err
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}
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return &result, nil
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}
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func (d *Database) prepare() error {
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var err error
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if err = d.joinedHostsStatements.prepare(d.db); err != nil {
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return err
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}
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if err = d.roomStatements.prepare(d.db); err != nil {
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return err
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}
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return d.PartitionOffsetStatements.Prepare(d.db, "federationsender")
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}
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// UpdateRoom updates the joined hosts for a room and returns what the joined
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// hosts were before the update, or nil if this was a duplicate message.
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// This is called when we receive a message from kafka, so we pass in
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// oldEventID and newEventID to check that we haven't missed any messages or
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// this isn't a duplicate message.
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func (d *Database) UpdateRoom(
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ctx context.Context,
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roomID, oldEventID, newEventID string,
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addHosts []types.JoinedHost,
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removeHosts []string,
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) (joinedHosts []types.JoinedHost, err error) {
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err = common.WithTransaction(d.db, func(txn *sql.Tx) error {
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err = d.insertRoom(ctx, txn, roomID)
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if err != nil {
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return err
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}
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lastSentEventID, err := d.selectRoomForUpdate(ctx, txn, roomID)
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if err != nil {
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return err
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}
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if lastSentEventID == newEventID {
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// We've handled this message before, so let's just ignore it.
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// We can only get a duplicate for the last message we processed,
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// so its enough just to compare the newEventID with lastSentEventID
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return nil
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}
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if lastSentEventID != oldEventID {
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return types.EventIDMismatchError{
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DatabaseID: lastSentEventID, RoomServerID: oldEventID,
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}
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}
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joinedHosts, err = d.selectJoinedHostsWithTx(ctx, txn, roomID)
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if err != nil {
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return err
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}
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for _, add := range addHosts {
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err = d.insertJoinedHosts(ctx, txn, roomID, add.MemberEventID, add.ServerName)
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if err != nil {
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return err
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}
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}
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if err = d.deleteJoinedHosts(ctx, txn, removeHosts); err != nil {
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return err
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}
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return d.updateRoom(ctx, txn, roomID, newEventID)
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})
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return
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}
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// GetJoinedHosts returns the currently joined hosts for room,
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// as known to federationserver.
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// Returns an error if something goes wrong.
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func (d *Database) GetJoinedHosts(
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ctx context.Context, roomID string,
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) ([]types.JoinedHost, error) {
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return d.selectJoinedHosts(ctx, roomID)
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}
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