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connection_counting_driver.go
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connection_counting_driver.go
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package metric
import (
"database/sql"
"database/sql/driver"
)
//go:generate counterfeiter . Conn
type Conn interface {
Prepare(query string) (driver.Stmt, error)
Close() error
Begin() (driver.Tx, error)
}
//go:generate counterfeiter . Driver
type Driver interface {
Open(name string) (driver.Conn, error)
}
type connectionCountingDriver struct {
Driver
}
func SetupConnectionCountingDriver(delegateDriverName, sqlDataSource, newDriverName string) {
delegateDBConn, err := sql.Open(delegateDriverName, sqlDataSource)
if err == nil {
// ignoring any connection errors since we only need this to access the driver struct
delegateDBConn.Close()
}
connectionCountingDriver := &connectionCountingDriver{delegateDBConn.Driver()}
sql.Register(newDriverName, connectionCountingDriver)
}
func (d *connectionCountingDriver) Open(name string) (driver.Conn, error) {
delegateConn, err := d.Driver.Open(name)
if err != nil {
return nil, err
}
DatabaseConnections.Inc()
return &connectionCountingConn{delegateConn}, nil
}
type connectionCountingConn struct {
driver.Conn
}
func (c *connectionCountingConn) Close() error {
err := c.Conn.Close()
if err != nil {
return err
}
DatabaseConnections.Dec()
return nil
}