mirror of
https://github.com/go-gitea/gitea
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387 lines
8.7 KiB
Go
Vendored
387 lines
8.7 KiB
Go
Vendored
package testfixtures
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import (
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"database/sql"
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"fmt"
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"strings"
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)
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type postgreSQL struct {
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baseHelper
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useAlterConstraint bool
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useDropConstraint bool
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skipResetSequences bool
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resetSequencesTo int64
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tables []string
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sequences []string
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nonDeferrableConstraints []pgConstraint
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constraints []pgConstraint
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tablesChecksum map[string]string
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}
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type pgConstraint struct {
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tableName string
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constraintName string
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definition string
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}
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func (h *postgreSQL) init(db *sql.DB) error {
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var err error
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h.tables, err = h.tableNames(db)
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if err != nil {
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return err
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}
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h.sequences, err = h.getSequences(db)
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if err != nil {
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return err
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}
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h.nonDeferrableConstraints, err = h.getNonDeferrableConstraints(db)
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if err != nil {
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return err
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}
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h.constraints, err = h.getConstraints(db)
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if 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 (*postgreSQL) paramType() int {
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return paramTypeDollar
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}
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func (*postgreSQL) databaseName(q queryable) (string, error) {
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var dbName string
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err := q.QueryRow("SELECT current_database()").Scan(&dbName)
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return dbName, err
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}
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func (h *postgreSQL) tableNames(q queryable) ([]string, error) {
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var tables []string
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sql := `
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SELECT pg_namespace.nspname || '.' || pg_class.relname
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FROM pg_class
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INNER JOIN pg_namespace ON pg_namespace.oid = pg_class.relnamespace
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WHERE pg_class.relkind = 'r'
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AND pg_namespace.nspname NOT IN ('pg_catalog', 'information_schema', 'crdb_internal')
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AND pg_namespace.nspname NOT LIKE 'pg_toast%'
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AND pg_namespace.nspname NOT LIKE '\_timescaledb%';
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`
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rows, err := q.Query(sql)
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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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for rows.Next() {
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var table string
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if err = rows.Scan(&table); err != nil {
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return nil, err
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}
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tables = append(tables, table)
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}
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if err = rows.Err(); err != nil {
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return nil, err
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}
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return tables, nil
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}
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func (h *postgreSQL) getSequences(q queryable) ([]string, error) {
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const sql = `
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SELECT pg_namespace.nspname || '.' || pg_class.relname AS sequence_name
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FROM pg_class
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INNER JOIN pg_namespace ON pg_namespace.oid = pg_class.relnamespace
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WHERE pg_class.relkind = 'S'
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AND pg_namespace.nspname NOT LIKE '\_timescaledb%'
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`
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rows, err := q.Query(sql)
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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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var sequences []string
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for rows.Next() {
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var sequence string
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if err = rows.Scan(&sequence); err != nil {
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return nil, err
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}
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sequences = append(sequences, sequence)
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}
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if err = rows.Err(); err != nil {
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return nil, err
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}
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return sequences, nil
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}
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func (*postgreSQL) getNonDeferrableConstraints(q queryable) ([]pgConstraint, error) {
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var constraints []pgConstraint
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sql := `
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SELECT table_schema || '.' || table_name, constraint_name
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FROM information_schema.table_constraints
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WHERE constraint_type = 'FOREIGN KEY'
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AND is_deferrable = 'NO'
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AND table_schema <> 'crdb_internal'
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AND table_schema NOT LIKE '\_timescaledb%'
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`
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rows, err := q.Query(sql)
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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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for rows.Next() {
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var constraint pgConstraint
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if err = rows.Scan(&constraint.tableName, &constraint.constraintName); err != nil {
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return nil, err
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}
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constraints = append(constraints, constraint)
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}
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if err = rows.Err(); err != nil {
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return nil, err
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}
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return constraints, nil
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}
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func (h *postgreSQL) getConstraints(q queryable) ([]pgConstraint, error) {
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var constraints []pgConstraint
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sql := `
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SELECT conrelid::regclass AS table_from, conname, pg_get_constraintdef(pg_constraint.oid)
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FROM pg_constraint
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INNER JOIN pg_namespace ON pg_namespace.oid = pg_constraint.connamespace
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WHERE contype = 'f'
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AND pg_namespace.nspname NOT IN ('pg_catalog', 'information_schema', 'crdb_internal')
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AND pg_namespace.nspname NOT LIKE 'pg_toast%'
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AND pg_namespace.nspname NOT LIKE '\_timescaledb%';
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`
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rows, err := q.Query(sql)
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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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for rows.Next() {
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var constraint pgConstraint
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if err = rows.Scan(
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&constraint.tableName,
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&constraint.constraintName,
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&constraint.definition,
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); err != nil {
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return nil, err
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}
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constraints = append(constraints, constraint)
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}
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if err = rows.Err(); err != nil {
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return nil, err
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}
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return constraints, nil
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}
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func (h *postgreSQL) dropAndRecreateConstraints(db *sql.DB, loadFn loadFunction) (err error) {
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defer func() {
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// Re-create constraints again after load
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var sql string
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for _, constraint := range h.constraints {
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sql += fmt.Sprintf(
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"ALTER TABLE %s ADD CONSTRAINT %s %s;",
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h.quoteKeyword(constraint.tableName),
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h.quoteKeyword(constraint.constraintName),
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constraint.definition,
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)
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}
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if _, err2 := db.Exec(sql); err2 != nil && err == nil {
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err = err2
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}
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}()
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var sql string
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for _, constraint := range h.constraints {
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sql += fmt.Sprintf(
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"ALTER TABLE %s DROP CONSTRAINT %s;",
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h.quoteKeyword(constraint.tableName),
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h.quoteKeyword(constraint.constraintName),
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)
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}
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if _, err := db.Exec(sql); err != nil {
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return err
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}
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tx, err := db.Begin()
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if err != nil {
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return err
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}
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defer tx.Rollback()
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if err = loadFn(tx); err != nil {
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return err
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}
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return tx.Commit()
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}
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func (h *postgreSQL) disableTriggers(db *sql.DB, loadFn loadFunction) (err error) {
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defer func() {
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// re-enable triggers after load
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var sql string
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for _, table := range h.tables {
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sql += fmt.Sprintf("ALTER TABLE %s ENABLE TRIGGER ALL;", h.quoteKeyword(table))
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}
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if _, err2 := db.Exec(sql); err2 != nil && err == nil {
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err = err2
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}
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}()
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tx, err := db.Begin()
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if err != nil {
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return err
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}
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var sql string
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for _, table := range h.tables {
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sql += fmt.Sprintf("ALTER TABLE %s DISABLE TRIGGER ALL;", h.quoteKeyword(table))
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}
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if _, err = tx.Exec(sql); err != nil {
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return err
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}
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if err = loadFn(tx); err != nil {
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tx.Rollback()
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return err
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}
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return tx.Commit()
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}
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func (h *postgreSQL) makeConstraintsDeferrable(db *sql.DB, loadFn loadFunction) (err error) {
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defer func() {
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// ensure constraint being not deferrable again after load
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var sql string
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for _, constraint := range h.nonDeferrableConstraints {
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sql += fmt.Sprintf("ALTER TABLE %s ALTER CONSTRAINT %s NOT DEFERRABLE;", h.quoteKeyword(constraint.tableName), h.quoteKeyword(constraint.constraintName))
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}
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if _, err2 := db.Exec(sql); err2 != nil && err == nil {
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err = err2
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}
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}()
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var sql string
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for _, constraint := range h.nonDeferrableConstraints {
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sql += fmt.Sprintf("ALTER TABLE %s ALTER CONSTRAINT %s DEFERRABLE;", h.quoteKeyword(constraint.tableName), h.quoteKeyword(constraint.constraintName))
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}
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if _, err := db.Exec(sql); err != nil {
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return err
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}
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tx, err := db.Begin()
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if err != nil {
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return err
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}
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defer tx.Rollback()
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if _, err = tx.Exec("SET CONSTRAINTS ALL DEFERRED"); err != nil {
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return err
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}
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if err = loadFn(tx); err != nil {
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return err
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}
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return tx.Commit()
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}
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func (h *postgreSQL) disableReferentialIntegrity(db *sql.DB, loadFn loadFunction) (err error) {
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// ensure sequences being reset after load
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if !h.skipResetSequences {
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defer func() {
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if err2 := h.resetSequences(db); err2 != nil && err == nil {
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err = err2
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}
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}()
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}
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if h.useDropConstraint {
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return h.dropAndRecreateConstraints(db, loadFn)
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}
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if h.useAlterConstraint {
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return h.makeConstraintsDeferrable(db, loadFn)
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}
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return h.disableTriggers(db, loadFn)
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}
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func (h *postgreSQL) resetSequences(db *sql.DB) error {
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resetSequencesTo := h.resetSequencesTo
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if resetSequencesTo == 0 {
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resetSequencesTo = 10000
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}
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for _, sequence := range h.sequences {
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_, err := db.Exec(fmt.Sprintf("SELECT SETVAL('%s', %d)", sequence, resetSequencesTo))
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if err != nil {
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return err
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}
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}
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return nil
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}
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func (h *postgreSQL) isTableModified(q queryable, tableName string) (bool, error) {
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checksum, err := h.getChecksum(q, tableName)
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if err != nil {
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return false, err
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}
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oldChecksum := h.tablesChecksum[tableName]
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return oldChecksum == "" || checksum != oldChecksum, nil
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}
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func (h *postgreSQL) afterLoad(q queryable) error {
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if h.tablesChecksum != nil {
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return nil
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}
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h.tablesChecksum = make(map[string]string, len(h.tables))
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for _, t := range h.tables {
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checksum, err := h.getChecksum(q, t)
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if err != nil {
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return err
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}
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h.tablesChecksum[t] = checksum
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}
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return nil
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}
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func (h *postgreSQL) getChecksum(q queryable, tableName string) (string, error) {
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sqlStr := fmt.Sprintf(`
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SELECT md5(CAST((json_agg(t.*)) AS TEXT))
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FROM %s AS t
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`,
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h.quoteKeyword(tableName),
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)
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var checksum sql.NullString
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if err := q.QueryRow(sqlStr).Scan(&checksum); err != nil {
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return "", err
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}
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return checksum.String, nil
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}
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func (*postgreSQL) quoteKeyword(s string) string {
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parts := strings.Split(s, ".")
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for i, p := range parts {
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parts[i] = fmt.Sprintf(`"%s"`, p)
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}
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return strings.Join(parts, ".")
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}
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