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dex/db/conn.go

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2015-08-18 05:57:27 +05:30
package db
import (
"database/sql"
"errors"
"fmt"
"strings"
"github.com/go-gorp/gorp"
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_ "github.com/lib/pq"
"github.com/coreos/dex/pkg/log"
"github.com/coreos/dex/repo"
)
type table struct {
name string
model interface{}
autoinc bool
pkey []string
// unique are non-primary key fields which should have uniqueness constraints.
unique []string
}
var (
tables []table
)
func register(t table) {
tables = append(tables, t)
}
type Config struct {
// Connection string in the format: <driver>://<username>:<password>@<host>:<port>/<database>
DSN string
// The maximum number of open connections to the database. The default is 0 (unlimited).
// For more details see: http://golang.org/pkg/database/sql/#DB.SetMaxOpenConns
MaxOpenConnections int
// The maximum number of connections in the idle connection pool. The default is 0 (unlimited).
// For more details see: http://golang.org/pkg/database/sql/#DB.SetMaxIdleConns
MaxIdleConnections int
}
func NewConnection(cfg Config) (*gorp.DbMap, error) {
if !strings.HasPrefix(cfg.DSN, "postgres://") {
return nil, errors.New("unrecognized database driver")
}
db, err := sql.Open("postgres", cfg.DSN)
if err != nil {
return nil, err
}
db.SetMaxIdleConns(cfg.MaxIdleConnections)
db.SetMaxOpenConns(cfg.MaxOpenConnections)
dbm := gorp.DbMap{
Db: db,
Dialect: gorp.PostgresDialect{},
}
for _, t := range tables {
tm := dbm.AddTableWithName(t.model, t.name).SetKeys(t.autoinc, t.pkey...)
for _, unique := range t.unique {
cm := tm.ColMap(unique)
if cm == nil {
return nil, fmt.Errorf("no such column: %q", unique)
}
cm.SetUnique(true)
}
}
return &dbm, nil
}
func TransactionFactory(conn *gorp.DbMap) repo.TransactionFactory {
return func() (repo.Transaction, error) {
return conn.Begin()
}
}
func rollback(tx *gorp.Transaction) {
err := tx.Rollback()
if err != nil {
log.Errorf("unable to rollback: %v", err)
}
}