mirror of
https://github.com/1f349/dendrite.git
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72285b2659
Sister PR to https://github.com/matrix-org/gomatrixserverlib/pull/364 Read this commit by commit to avoid going insane.
109 lines
3.1 KiB
Go
109 lines
3.1 KiB
Go
package deltas
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import (
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"context"
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"database/sql"
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"fmt"
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"strings"
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"github.com/lib/pq"
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"github.com/matrix-org/gomatrixserverlib/spec"
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"github.com/sirupsen/logrus"
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)
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var serverNamesTables = []string{
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"userapi_accounts",
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"userapi_account_datas",
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"userapi_devices",
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"userapi_notifications",
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"userapi_openid_tokens",
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"userapi_profiles",
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"userapi_pushers",
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"userapi_threepids",
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}
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// These tables have a PRIMARY KEY constraint which we need to drop so
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// that we can recreate a new unique index that contains the server name.
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var serverNamesDropPK = []string{
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"userapi_accounts",
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"userapi_account_datas",
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"userapi_profiles",
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}
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// These indices are out of date so let's drop them. They will get recreated
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// automatically.
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var serverNamesDropIndex = []string{
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"userapi_pusher_localpart_idx",
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"userapi_pusher_app_id_pushkey_localpart_idx",
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}
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// I know what you're thinking: you're wondering "why doesn't this use $1
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// and pass variadic parameters to ExecContext?" — the answer is because
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// PostgreSQL doesn't expect the table name to be specified as a substituted
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// argument in that way so it results in a syntax error in the query.
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func UpServerNames(ctx context.Context, tx *sql.Tx, serverName spec.ServerName) error {
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for _, table := range serverNamesTables {
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q := fmt.Sprintf(
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"SELECT COUNT(name) FROM sqlite_schema WHERE type='table' AND name=%s;",
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pq.QuoteIdentifier(table),
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)
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var c int
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if err := tx.QueryRowContext(ctx, q).Scan(&c); err != nil || c == 0 {
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continue
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}
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q = fmt.Sprintf(
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"SELECT COUNT(*) FROM pragma_table_info(%s) WHERE name='server_name'",
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pq.QuoteIdentifier(table),
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)
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if err := tx.QueryRowContext(ctx, q).Scan(&c); err != nil || c == 1 {
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logrus.Infof("Table %s already has column, skipping", table)
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continue
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}
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if c == 0 {
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q = fmt.Sprintf(
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"ALTER TABLE %s ADD COLUMN server_name TEXT NOT NULL DEFAULT '';",
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pq.QuoteIdentifier(table),
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)
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if _, err := tx.ExecContext(ctx, q); err != nil {
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return fmt.Errorf("add server name to %q error: %w", table, err)
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}
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}
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}
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for _, table := range serverNamesDropPK {
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q := fmt.Sprintf(
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"SELECT COUNT(name), sql FROM sqlite_schema WHERE type='table' AND name=%s;",
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pq.QuoteIdentifier(table),
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)
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var c int
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var sql string
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if err := tx.QueryRowContext(ctx, q).Scan(&c, &sql); err != nil || c == 0 {
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continue
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}
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q = fmt.Sprintf(`
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%s; -- create temporary table
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INSERT INTO %s SELECT * FROM %s; -- copy data
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DROP TABLE %s; -- drop original table
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ALTER TABLE %s RENAME TO %s; -- rename new table
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`,
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strings.Replace(sql, table, table+"_tmp", 1), // create temporary table
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table+"_tmp", table, // copy data
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table, // drop original table
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table+"_tmp", table, // rename new table
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)
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if _, err := tx.ExecContext(ctx, q); err != nil {
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return fmt.Errorf("drop PK from %q error: %w", table, err)
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}
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}
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for _, index := range serverNamesDropIndex {
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q := fmt.Sprintf(
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"DROP INDEX IF EXISTS %s;",
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pq.QuoteIdentifier(index),
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)
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if _, err := tx.ExecContext(ctx, q); err != nil {
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return fmt.Errorf("drop index %q error: %w", index, err)
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}
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}
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return nil
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}
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