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140 lines
3.0 KiB
140 lines
3.0 KiB
package goose
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import (
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"database/sql"
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"errors"
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"fmt"
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"os"
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"path/filepath"
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"github.com/kylelemons/go-gypsy/yaml"
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"github.com/lib/pq"
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)
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// DBDriver encapsulates the info needed to work with
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// a specific database driver
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type DBDriver struct {
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Name string
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OpenStr string
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Import string
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Dialect SqlDialect
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}
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type DBConf struct {
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MigrationsDir string
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Env string
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Driver DBDriver
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PgSchema string
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}
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// extract configuration details from the given file
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func NewDBConf(p, env string, pgschema string) (*DBConf, error) {
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cfgFile := filepath.Join(p, "dbconf.yml")
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f, err := yaml.ReadFile(cfgFile)
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if err != nil {
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return nil, err
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}
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drv, err := f.Get(fmt.Sprintf("%s.driver", env))
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if err != nil {
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return nil, err
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}
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drv = os.ExpandEnv(drv)
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open, err := f.Get(fmt.Sprintf("%s.open", env))
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if err != nil {
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return nil, err
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}
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open = os.ExpandEnv(open)
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// Automatically parse postgres urls
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if drv == "postgres" {
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// Assumption: If we can parse the URL, we should
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if parsedURL, err := pq.ParseURL(open); err == nil && parsedURL != "" {
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open = parsedURL
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}
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}
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d := newDBDriver(drv, open)
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// allow the configuration to override the Import for this driver
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if imprt, err := f.Get(fmt.Sprintf("%s.import", env)); err == nil {
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d.Import = imprt
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}
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// allow the configuration to override the Dialect for this driver
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if dialect, err := f.Get(fmt.Sprintf("%s.dialect", env)); err == nil {
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d.Dialect = dialectByName(dialect)
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}
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if !d.IsValid() {
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return nil, errors.New(fmt.Sprintf("Invalid DBConf: %v", d))
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}
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return &DBConf{
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MigrationsDir: filepath.Join(p, "migrations"),
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Env: env,
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Driver: d,
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PgSchema: pgschema,
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}, nil
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}
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// Create a new DBDriver and populate driver specific
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// fields for drivers that we know about.
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// Further customization may be done in NewDBConf
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func newDBDriver(name, open string) DBDriver {
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d := DBDriver{
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Name: name,
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OpenStr: open,
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}
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switch name {
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case "postgres":
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d.Import = "github.com/lib/pq"
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d.Dialect = &PostgresDialect{}
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case "mymysql":
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d.Import = "github.com/ziutek/mymysql/godrv"
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d.Dialect = &MySqlDialect{}
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case "mysql":
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d.Import = "github.com/go-sql-driver/mysql"
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d.Dialect = &MySqlDialect{}
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case "sqlite3":
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d.Import = "github.com/mattn/go-sqlite3"
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d.Dialect = &Sqlite3Dialect{}
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}
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return d
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}
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// ensure we have enough info about this driver
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func (drv *DBDriver) IsValid() bool {
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return len(drv.Import) > 0 && drv.Dialect != nil
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}
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// OpenDBFromDBConf wraps database/sql.DB.Open() and configures
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// the newly opened DB based on the given DBConf.
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//
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// Callers must Close() the returned DB.
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func OpenDBFromDBConf(conf *DBConf) (*sql.DB, error) {
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db, err := sql.Open(conf.Driver.Name, conf.Driver.OpenStr)
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if err != nil {
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return nil, err
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}
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// if a postgres schema has been specified, apply it
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if conf.Driver.Name == "postgres" && conf.PgSchema != "" {
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if _, err := db.Exec("SET search_path TO " + conf.PgSchema); err != nil {
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return nil, err
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}
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}
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return db, nil
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}
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