100 lines
3.2 KiB
Go
100 lines
3.2 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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"database/sql"
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"github.com/matrix-org/dendrite/roomserver/types"
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)
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const eventJSONSchema = `
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-- Stores the JSON for each event. This kept separate from the main events
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-- table to keep the rows in the main events table small.
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CREATE TABLE IF NOT EXISTS event_json (
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-- Local numeric ID for the event.
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event_nid BIGINT NOT NULL PRIMARY KEY,
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-- The JSON for the event.
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-- Stored as TEXT because this should be valid UTF-8.
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-- Not stored as a JSONB because we always just pull the entire event
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-- so there is no point in postgres parsing it.
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-- Not stored as JSON because we already validate the JSON in the server
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-- so there is no point in postgres validating it.
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-- TODO: Should we be compressing the events with Snappy or DEFLATE?
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event_json TEXT NOT NULL
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);
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`
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const insertEventJSONSQL = "" +
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"INSERT INTO event_json (event_nid, event_json) VALUES ($1, $2)" +
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" ON CONFLICT DO NOTHING"
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// Bulk event JSON lookup by numeric event ID.
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// Sort by the numeric event ID.
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// This means that we can use binary search to lookup by numeric event ID.
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const bulkSelectEventJSONSQL = "" +
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"SELECT event_nid, event_json FROM event_json" +
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" WHERE event_nid = ANY($1)" +
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" ORDER BY event_nid ASC"
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type eventJSONStatements struct {
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insertEventJSONStmt *sql.Stmt
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bulkSelectEventJSONStmt *sql.Stmt
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}
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func (s *eventJSONStatements) prepare(db *sql.DB) (err error) {
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_, err = db.Exec(eventJSONSchema)
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if err != nil {
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return
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}
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return statementList{
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{&s.insertEventJSONStmt, insertEventJSONSQL},
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{&s.bulkSelectEventJSONStmt, bulkSelectEventJSONSQL},
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}.prepare(db)
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}
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func (s *eventJSONStatements) insertEventJSON(eventNID types.EventNID, eventJSON []byte) error {
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_, err := s.insertEventJSONStmt.Exec(int64(eventNID), eventJSON)
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return err
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}
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type eventJSONPair struct {
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EventNID types.EventNID
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EventJSON []byte
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}
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func (s *eventJSONStatements) bulkSelectEventJSON(eventNIDs []types.EventNID) ([]eventJSONPair, error) {
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rows, err := s.bulkSelectEventJSONStmt.Query(eventNIDsAsArray(eventNIDs))
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if err != nil {
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return nil, err
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}
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defer rows.Close()
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// We know that we will only get as many results as event NIDs
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// because of the unique constraint on event NIDs.
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// So we can allocate an array of the correct size now.
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// We might get fewer results than NIDs so we adjust the length of the slice before returning it.
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results := make([]eventJSONPair, len(eventNIDs))
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i := 0
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for ; rows.Next(); i++ {
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result := &results[i]
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var eventNID int64
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if err := rows.Scan(&eventNID, &result.EventJSON); err != nil {
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return nil, err
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}
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result.EventNID = types.EventNID(eventNID)
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}
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return results[:i], nil
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}
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