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