dendrite/userapi/storage/sqlite3/deltas/2022110411000000_server_names.go
kegsay 72285b2659
refactor: update GMSL (#3058)
Sister PR to https://github.com/matrix-org/gomatrixserverlib/pull/364

Read this commit by commit to avoid going insane.
2023-04-19 15:50:33 +01:00

109 lines
3.1 KiB
Go

package deltas
import (
"context"
"database/sql"
"fmt"
"strings"
"github.com/lib/pq"
"github.com/matrix-org/gomatrixserverlib/spec"
"github.com/sirupsen/logrus"
)
var serverNamesTables = []string{
"userapi_accounts",
"userapi_account_datas",
"userapi_devices",
"userapi_notifications",
"userapi_openid_tokens",
"userapi_profiles",
"userapi_pushers",
"userapi_threepids",
}
// These tables have a PRIMARY KEY constraint which we need to drop so
// that we can recreate a new unique index that contains the server name.
var serverNamesDropPK = []string{
"userapi_accounts",
"userapi_account_datas",
"userapi_profiles",
}
// These indices are out of date so let's drop them. They will get recreated
// automatically.
var serverNamesDropIndex = []string{
"userapi_pusher_localpart_idx",
"userapi_pusher_app_id_pushkey_localpart_idx",
}
// I know what you're thinking: you're wondering "why doesn't this use $1
// and pass variadic parameters to ExecContext?" — the answer is because
// PostgreSQL doesn't expect the table name to be specified as a substituted
// argument in that way so it results in a syntax error in the query.
func UpServerNames(ctx context.Context, tx *sql.Tx, serverName spec.ServerName) error {
for _, table := range serverNamesTables {
q := fmt.Sprintf(
"SELECT COUNT(name) FROM sqlite_schema WHERE type='table' AND name=%s;",
pq.QuoteIdentifier(table),
)
var c int
if err := tx.QueryRowContext(ctx, q).Scan(&c); err != nil || c == 0 {
continue
}
q = fmt.Sprintf(
"SELECT COUNT(*) FROM pragma_table_info(%s) WHERE name='server_name'",
pq.QuoteIdentifier(table),
)
if err := tx.QueryRowContext(ctx, q).Scan(&c); err != nil || c == 1 {
logrus.Infof("Table %s already has column, skipping", table)
continue
}
if c == 0 {
q = fmt.Sprintf(
"ALTER TABLE %s ADD COLUMN server_name TEXT NOT NULL DEFAULT '';",
pq.QuoteIdentifier(table),
)
if _, err := tx.ExecContext(ctx, q); err != nil {
return fmt.Errorf("add server name to %q error: %w", table, err)
}
}
}
for _, table := range serverNamesDropPK {
q := fmt.Sprintf(
"SELECT COUNT(name), sql FROM sqlite_schema WHERE type='table' AND name=%s;",
pq.QuoteIdentifier(table),
)
var c int
var sql string
if err := tx.QueryRowContext(ctx, q).Scan(&c, &sql); err != nil || c == 0 {
continue
}
q = fmt.Sprintf(`
%s; -- create temporary table
INSERT INTO %s SELECT * FROM %s; -- copy data
DROP TABLE %s; -- drop original table
ALTER TABLE %s RENAME TO %s; -- rename new table
`,
strings.Replace(sql, table, table+"_tmp", 1), // create temporary table
table+"_tmp", table, // copy data
table, // drop original table
table+"_tmp", table, // rename new table
)
if _, err := tx.ExecContext(ctx, q); err != nil {
return fmt.Errorf("drop PK from %q error: %w", table, err)
}
}
for _, index := range serverNamesDropIndex {
q := fmt.Sprintf(
"DROP INDEX IF EXISTS %s;",
pq.QuoteIdentifier(index),
)
if _, err := tx.ExecContext(ctx, q); err != nil {
return fmt.Errorf("drop index %q error: %w", index, err)
}
}
return nil
}