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// +build go1.10
package mssql
import (
"context"
"database/sql/driver"
"errors"
"fmt"
)
var _ driver.Connector = &accessTokenConnector{}
// accessTokenConnector wraps Connector and injects a
// fresh access token when connecting to the database
type accessTokenConnector struct {
Connector
accessTokenProvider func() (string, error)
}
// NewAccessTokenConnector creates a new connector from a DSN and a token provider.
// The token provider func will be called when a new connection is requested and should return a valid access token.
// The returned connector may be used with sql.OpenDB.
func NewAccessTokenConnector(dsn string, tokenProvider func() (string, error)) (driver.Connector, error) {
if tokenProvider == nil {
return nil, errors.New("mssql: tokenProvider cannot be nil")
}
conn, err := NewConnector(dsn)
if err != nil {
return nil, err
}
c := &accessTokenConnector{
Connector: *conn,
accessTokenProvider: tokenProvider,
}
return c, nil
}
// Connect returns a new database connection
func (c *accessTokenConnector) Connect(ctx context.Context) (driver.Conn, error) {
var err error
c.Connector.params.fedAuthAccessToken, err = c.accessTokenProvider()
if err != nil {
return nil, fmt.Errorf("mssql: error retrieving access token: %+v", err)
}
return c.Connector.Connect(ctx)
}
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