// SetTarget can be called to change the target used for subsequent calls.
func (conn *TabletBson) SetTarget(keyspace, shard string, tabletType pbt.TabletType) error {
conn.mu.Lock()
defer conn.mu.Unlock()
if conn.target == nil {
return fmt.Errorf("cannot set target on sessionId based conn")
}
if tabletType == pbt.TabletType_UNKNOWN {
return fmt.Errorf("cannot set tablet type to UNKNOWN")
}
conn.target = &tproto.Target{
Keyspace: keyspace,
Shard: shard,
TabletType: tproto.TabletType(tabletType),
}
return nil
}
// DialTablet creates and initializes TabletBson.
func DialTablet(ctx context.Context, endPoint *pbt.EndPoint, keyspace, shard string, tabletType pbt.TabletType, timeout time.Duration) (tabletconn.TabletConn, error) {
addr := netutil.JoinHostPort(endPoint.Host, endPoint.PortMap["vt"])
conn := &TabletBson{endPoint: endPoint}
var err error
if *tabletBsonUsername != "" {
conn.rpcClient, err = bsonrpc.DialAuthHTTP("tcp", addr, *tabletBsonUsername, *tabletBsonPassword, timeout)
} else {
conn.rpcClient, err = bsonrpc.DialHTTP("tcp", addr, timeout)
}
if err != nil {
return nil, tabletError(err)
}
if tabletType == pbt.TabletType_UNKNOWN {
// we use session
var sessionInfo tproto.SessionInfo
if err = conn.rpcClient.Call(ctx, "SqlQuery.GetSessionId", tproto.SessionParams{Keyspace: keyspace, Shard: shard}, &sessionInfo); err != nil {
conn.rpcClient.Close()
return nil, tabletError(err)
}
// SqlQuery.GetSessionId might return an application error inside the SessionInfo
if err = vterrors.FromRPCError(sessionInfo.Err); err != nil {
conn.rpcClient.Close()
return nil, tabletError(err)
}
conn.sessionID = sessionInfo.SessionId
} else {
// we use target
conn.target = &tproto.Target{
Keyspace: keyspace,
Shard: shard,
TabletType: tproto.TabletType(tabletType),
}
}
return conn, nil
}