/* Reads the next result row from the snapshot query, parses and processes it.
* Blocks until a new row is available, if necessary. */
int snapshot_poll(client_context_t context) {
int err = 0;
PGresult *res = PQgetResult(context->sql_conn);
/* null result indicates that there are no more rows */
if (!res) {
check(err, exec_sql(context, "COMMIT"));
PQfinish(context->sql_conn);
context->sql_conn = NULL;
// Invoke the commit callback with xid==0 to indicate end of snapshot
commit_txn_cb on_commit = context->repl.frame_reader->on_commit_txn;
void *cb_context = context->repl.frame_reader->cb_context;
if (on_commit) {
check(err, on_commit(cb_context, context->repl.start_lsn, 0));
}
return 0;
}
ExecStatusType status = PQresultStatus(res);
if (status != PGRES_SINGLE_TUPLE && status != PGRES_TUPLES_OK) {
client_error(context, "While reading snapshot: %s: %s",
PQresStatus(PQresultStatus(res)),
PQresultErrorMessage(res));
PQclear(res);
return EIO;
}
int tuples = PQntuples(res);
for (int tuple = 0; tuple < tuples; tuple++) {
check(err, snapshot_tuple(context, res, tuple));
}
PQclear(res);
return err;
}
virtual void on_start(){
ease_assert( m_db.create(), "%d => %s", m_db.code(), m_db.msg().p() );
on_bool();
on_int8();
on_uint8();
on_int16();
on_uint16();
on_int32();
on_uint32();
on_int64();
on_uint64();
on_float();
on_double();
on_string();
on_rollback();
on_commit();
}
