#'@title Request to the API, depending on the action provided
#'@description Prepare the data to send it 'OpenBlender' API. This function is not used by users.
#'@param json_parametros Request parameters
#'@param url Url selected
#'@return List of observations obtained with \link{dameRespuestaLlamado}.
#'@keywords internal
get_observations <- function(json_parametros, url) {
action <- "API_getSampleObservationsFromDataset"
start <- Sys.time()
if ("test_call" %in% attributes(json_parametros)$names && (json_parametros$test_call == 1 || json_parametros$test_call == "on")) {
test_call <- 1
} else {
test_call <- FALSE
}
if (test_call == 1) {
message("This is a TEST CALL, set \"test_call\" : \"off\" or remove to execute service.")
data <- list(action = action, json = json_parametros)
respuesta <- dameRespuestaLlamado(url, data)
df_resp <- respuesta$sample
t_universo <- 0
} else {
json_parametros$tamano_bin <- 50
json_parametros$skip <- 0
message("Downloading...")
data <- list(action = action, json = json_parametros)
respuesta <- dameRespuestaLlamado(url, data)
t_universo <- respuesta$universe_size
stop <- Sys.time()
segundos <- ceiling(stop - start)
tam_pedazo <- as.integer(round(600 / as.integer(segundos), digits = 0))
nums_pedazos <- ceiling(t_universo / tam_pedazo)
if (nums_pedazos <= 0) {
nums_pedazos <- 1
}
df_resp <- NULL
for (i in seq(0, nums_pedazos, by = 1)) {
json_parametros$tamano_bin <- tam_pedazo
json_parametros$skip <- tam_pedazo * i
data <- list(action = action, json = json_parametros)
respuesta <- dameRespuestaLlamado(url, data)
df <- respuesta$sample
if (is.null(df_resp)) {
df_resp <- df
} else {
df_resp <- rbind(df_resp, df)
}
avance <- round(((i) / nums_pedazos) * 100, digits = 2)
if (avance >= 100) {
message(paste(avance, "% completed."))
} else {
message(paste(avance, "%"))
}
}
if ("sample_size" %in% attributes(json_parametros)$names) {
if (as.integer(json_parametros$sample_size) < nrow(df_resp)) {
df_resp <- df_resp[-sample(nrow(df_resp), (nrow(df_resp) - as.integer(json_parametros$sample_size))), ]
}
}
}
df_resp <- df_resp[order(-as.integer(df_resp$timestamp)), ]
respuesta <- list(universe_size = t_universo, sample = df_resp)
return(respuesta)
}
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