TrackActivity <- function(session, action = '', data = NULL, dir = '.') {
cdata <- session$clientData;
ddata <- lapply(names(cdata), function(name) cdata[[name]]);
names(ddata) <- names(cdata);
fn <- paste(dir, '/', as.character(Sys.Date()), '_', as.integer(Sys.time()), '_', session$token, '.rds', sep='');
saveRDS(list(clientData = ddata, action = action, data = data), fn);
}
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