func connect(conninfo string) (*PgConn, error) {
cs := C.CString(conninfo)
defer C.free(unsafe.Pointer(cs))
conn := C.PQconnectdb(cs)
if C.PQstatus(conn) != C.CONNECTION_OK {
cerr := C.PQerrorMessage(conn)
err := fmt.Errorf("connection failed: %s", C.GoString(cerr))
C.PQfinish(conn)
return nil, err
}
// TODO: support other encodings?
pname := C.CString("client_encoding")
defer C.free(unsafe.Pointer(pname))
cenc := C.PQparameterStatus(conn, pname)
if cenc == nil {
err := errors.New("connection failed: no client encoding")
C.PQfinish(conn)
return nil, err
}
if enc := C.GoString(cenc); enc != "UTF8" {
err := fmt.Errorf(
"connection failed: client encoding not supported: %s", enc)
C.PQfinish(conn)
return nil, err
}
// one-line error message
C.PQsetErrorVerbosity(conn, C.PQERRORS_TERSE)
return &PgConn{conn: conn, conninfo: conninfo}, nil
}
// dsn is passed directly to PQconnectdb
func (d *libpqDriver) Open(dsn string) (driver.Conn, error) {
if C.PQisthreadsafe() != 1 {
return nil, ErrThreadSafety
}
params := C.CString(dsn)
defer C.free(unsafe.Pointer(params))
db := C.PQconnectdb(params)
if C.PQstatus(db) != C.CONNECTION_OK {
defer C.PQfinish(db)
return nil, errors.New("libpq: connection error " + C.GoString(C.PQerrorMessage(db)))
}
oids, err := d.getOids(db, dsn)
if err != nil {
defer C.PQfinish(db)
return nil, ErrFetchingOids
}
return &libpqConn{
db: db,
oids: oids,
stmtCache: make(map[string]driver.Stmt),
stmtNum: 0,
}, nil
}
func connError(db *C.PGconn) error {
return errors.New("conn error:" + C.GoString(C.PQerrorMessage(db)))
}