126 lines
3.7 KiB
Go
126 lines
3.7 KiB
Go
// Copyright 2017 Jan Christian Grünhage
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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 postgres
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import (
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"context"
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"database/sql"
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"encoding/json"
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"github.com/matrix-org/dendrite/internal/sqlutil"
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"github.com/matrix-org/dendrite/syncapi/storage/tables"
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"github.com/matrix-org/gomatrixserverlib"
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)
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const filterSchema = `
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-- Stores data about filters
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CREATE TABLE IF NOT EXISTS syncapi_filter (
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-- The filter
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filter TEXT NOT NULL,
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-- The ID
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id SERIAL UNIQUE,
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-- The localpart of the Matrix user ID associated to this filter
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localpart TEXT NOT NULL,
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PRIMARY KEY(id, localpart)
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);
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CREATE INDEX IF NOT EXISTS syncapi_filter_localpart ON syncapi_filter(localpart);
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`
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const selectFilterSQL = "" +
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"SELECT filter FROM syncapi_filter WHERE localpart = $1 AND id = $2"
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const selectFilterIDByContentSQL = "" +
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"SELECT id FROM syncapi_filter WHERE localpart = $1 AND filter = $2"
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const insertFilterSQL = "" +
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"INSERT INTO syncapi_filter (filter, id, localpart) VALUES ($1, DEFAULT, $2) RETURNING id"
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type filterStatements struct {
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selectFilterStmt *sql.Stmt
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selectFilterIDByContentStmt *sql.Stmt
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insertFilterStmt *sql.Stmt
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}
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func NewPostgresFilterTable(db *sql.DB) (tables.Filter, error) {
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_, err := db.Exec(filterSchema)
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if err != nil {
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return nil, err
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}
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s := &filterStatements{}
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return s, sqlutil.StatementList{
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{&s.selectFilterStmt, selectFilterSQL},
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{&s.selectFilterIDByContentStmt, selectFilterIDByContentSQL},
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{&s.insertFilterStmt, insertFilterSQL},
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}.Prepare(db)
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}
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func (s *filterStatements) SelectFilter(
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ctx context.Context, txn *sql.Tx, target *gomatrixserverlib.Filter, localpart string, filterID string,
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) error {
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// Retrieve filter from database (stored as canonical JSON)
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var filterData []byte
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err := sqlutil.TxStmt(txn, s.selectFilterStmt).QueryRowContext(ctx, localpart, filterID).Scan(&filterData)
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if err != nil {
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return err
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}
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// Unmarshal JSON into Filter struct
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if err = json.Unmarshal(filterData, &target); err != nil {
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return err
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}
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return nil
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}
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func (s *filterStatements) InsertFilter(
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ctx context.Context, txn *sql.Tx, filter *gomatrixserverlib.Filter, localpart string,
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) (filterID string, err error) {
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var existingFilterID string
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// Serialise json
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filterJSON, err := json.Marshal(filter)
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if err != nil {
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return "", err
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}
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// Remove whitespaces and sort JSON data
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// needed to prevent from inserting the same filter multiple times
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filterJSON, err = gomatrixserverlib.CanonicalJSON(filterJSON)
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if err != nil {
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return "", err
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}
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// Check if filter already exists in the database using its localpart and content
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//
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// This can result in a race condition when two clients try to insert the
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// same filter and localpart at the same time, however this is not a
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// problem as both calls will result in the same filterID
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err = sqlutil.TxStmt(txn, s.selectFilterIDByContentStmt).QueryRowContext(
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ctx, localpart, filterJSON,
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).Scan(&existingFilterID)
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if err != nil && err != sql.ErrNoRows {
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return "", err
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}
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// If it does, return the existing ID
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if existingFilterID != "" {
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return existingFilterID, err
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}
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// Otherwise insert the filter and return the new ID
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err = sqlutil.TxStmt(txn, s.insertFilterStmt).QueryRowContext(ctx, filterJSON, localpart).
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Scan(&filterID)
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return
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}
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