/
create.go
199 lines (157 loc) · 4.56 KB
/
create.go
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package pgrepo
import (
"context"
"database/sql"
"errors"
"fmt"
"net/url"
"strings"
"github.com/fredbi/go-trace/log"
"github.com/jmoiron/sqlx"
"go.uber.org/zap"
)
// EnsureDB ensures that database "dbName" is created and returns a connection pool.
//
// The "created" flag indicates if the database had to be freshly created or not.
//
// NOTE: credentials to connect to the database must be sufficient to create the database.
func EnsureDB(ctx context.Context, dbName string, opts ...Option) (db *sqlx.DB, created bool, err error) {
s := settingsFromOptions(opts)
dbs := s.DBSettingsFor(dbName)
if dbName != DefaultDBAlias {
if err = dbs.SwitchDB(dbName); err != nil {
return nil, false, err
}
}
l := s.logger
created, err = CreateDB(ctx, dbName, opts...)
if err != nil {
return nil, true, err
}
r := &Repository{
log: log.NewFactory(l),
databaseSettings: dbs,
}
connCfg := dbs.ConnConfig(dbs.DBURL(), r.log, "")
db, err = r.open(ctx, connCfg)
if err != nil {
return nil, created, fmt.Errorf("could not connect to database server %v: %w", dbs.RedactedURL(), err)
}
l.Info("database open", zap.String("db_url", dbs.RedactedURL()))
return db, created, err
}
// CreateDB creates a database "dbName".
//
// NOTE: credentials to connect to the database must be sufficient to create the database.
func CreateDB(parentCtx context.Context, dbName string, opts ...Option) (bool, error) {
s := settingsFromOptions(opts)
dbs := s.DBSettingsFor(dbName)
if dbs.URL == "" {
return false, fmt.Errorf(`no database URL found in config file. Expected "url" in config section %q`, dbName)
}
if dbName == DefaultDBAlias {
u, err := url.Parse(dbs.URL)
if err != nil {
return false, err
}
dbName = strings.TrimPrefix(u.Path, "/")
}
l := s.logger.With(zap.String("db_name", dbName))
ctx, cancel := context.WithCancel(parentCtx)
defer cancel()
db, closer, err := connectNoDB(ctx, dbs.URL, dbs, l)
if err != nil {
return false, err
}
defer closer()
tx, err := db.BeginTxx(ctx, nil)
if err != nil {
return false, err
}
ok, err := dbExists(ctx, tx, dbName)
if err != nil {
return false, err
}
if ok {
_ = tx.Commit()
return false, nil
}
l.Info("creating database")
_, err = db.ExecContext(ctx, fmt.Sprintf(`CREATE DATABASE %s`, dbName))
if err != nil {
return false, fmt.Errorf("could not create database %s: %w", dbName, err)
}
if err = tx.Commit(); err != nil {
return false, fmt.Errorf("could not create database %s: %w", dbName, err)
}
l.Info("new database created")
return true, nil
}
// DropDB drops the database "dbName".
//
// NOTE: credentials to connect to the database must be sufficient to drop the database.
func DropDB(parentCtx context.Context, dbName string, opts ...Option) (bool, error) {
ctx, cancel := context.WithCancel(parentCtx)
defer cancel()
s := settingsFromOptions(opts)
dbs := s.DBSettingsFor(dbName)
db, closer, err := connectNoDB(ctx, dbs.URL, dbs, s.logger)
if err != nil {
return false, err
}
defer closer()
tx, err := db.BeginTxx(ctx, nil)
if err != nil {
return false, err
}
ok, err := dbExists(ctx, tx, dbName)
if err != nil {
return false, err
}
if !ok {
return false, nil
}
_, err = db.ExecContext(ctx, fmt.Sprintf(`DROP DATABASE IF EXISTS %s`, dbName))
if err != nil {
return false, fmt.Errorf("could not drop database %s: %w", dbName, err)
}
err = tx.Commit()
if err != nil {
return false, fmt.Errorf("could not drop database %s: %w", dbName, err)
}
return true, nil
}
// connectNoDB connects to the postgres engine pointed to by the DSN, but without any DB open
func connectNoDB(ctx context.Context, dsn string, s databaseSettings, l *zap.Logger) (*sqlx.DB, func(), error) {
u, err := url.Parse(dsn)
if err != nil {
return nil, nil, errors.Join(ErrInvalidPGURL, err)
}
u.Path = "postgres" // postgres default DB
s.URL = u.String()
if err = s.Validate(); err != nil {
return nil, nil, err
}
r := &Repository{
log: log.NewFactory(l),
databaseSettings: s,
}
connCfg := s.ConnConfig(s.DBURL(), r.log, "")
db, err := r.open(ctx, connCfg)
if err != nil {
return nil, nil, fmt.Errorf("could not connect to database server %v: %w", u, err)
}
return db, func() { _ = db.Close() }, nil
}
func dbExists(ctx context.Context, tx *sqlx.Tx, dbName string) (bool, error) {
var ignored sql.NullString
err := tx.QueryRowContext(ctx, "SELECT datname FROM pg_database WHERE datname = $1", dbName).Scan(&ignored)
if err == nil {
// already there
return true, nil
}
if errors.Is(err, sql.ErrNoRows) {
return false, nil
}
return false, err
}