static void snapshot_float(t_snapshot *x, t_float f)
{
/* CHECKED nonzero/zero, CHECKED incompatible: int only (float ignored) */
if (f != 0.)
snapshot_start(x);
else
snapshot_stop(x);
}
/* Connects to the Postgres server (using context->conninfo for server info and
* context->app_name as client name), and checks whether replication slot
* context->repl.slot_name already exists. If yes, sets up the context to start
* receiving the stream of changes from that slot. If no, creates the slot, and
* initiates the consistent snapshot. */
int db_client_start(client_context_t context) {
int err = 0;
bool slot_exists;
check(err, client_connect(context));
checkRepl(err, context, replication_stream_check(&context->repl));
check(err, replication_slot_exists(context, &slot_exists));
if (slot_exists) {
PQfinish(context->sql_conn);
context->sql_conn = NULL;
context->taking_snapshot = false;
checkRepl(err, context, replication_stream_start(&context->repl));
return err;
} else {
context->taking_snapshot = true;
checkRepl(err, context, replication_slot_create(&context->repl));
check(err, snapshot_start(context));
return err;
}
}