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utils.R
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utils.R
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#' @importFrom jsonlite toJSON fromJSON
#' @importFrom dplyr tbl_df
#' @importFrom methods is
#' @importFrom httr content POST add_headers headers
# status check
monkeylearn_check <- function(req) {
if (req$status_code < 400) return(TRUE)
if (req$status_code == 429) {
"Pause for throttle limit, 60 seconds"
Sys.sleep(60)
return(FALSE)
}
if (identical(req, "")) {
stop("No output to parse",
call. = FALSE)
Sys.sleep(10)
return(FALSE)
}
stop("HTTP failure: ", req$status_code, "\n", content(req)$detail, call. = FALSE)
}
# format request
monkeylearn_prep <- function(text, params) {
toJSON(c(list(text_list = I(text)),
params),
auto_unbox = TRUE)
}
# base URL
monkeylearn_url <- function() {
"https://api.monkeylearn.com/v2/"
}
# URL for classify
monkeylearn_url_classify <- function(classifier_id) {
paste0(monkeylearn_url(),
"classifiers/",
classifier_id,
"/classify/")
}
# URL for extractor
monkeylearn_url_extractor <- function(extractor_id) {
paste0(monkeylearn_url(),
"extractors/",
extractor_id,
"/extract/")
}
# check text size
monkeylearn_text_size <- function(request) {
if(any(unlist(vapply(request, nchar, type = "bytes",
FUN.VALUE = 0)) > 500000)) {
stop("Each text in the request should be smaller than 500 kb.",
call. = FALSE)
}
}
# get results classify
monkeylearn_get_classify <- function(request, key, classifier_id) {
POST(monkeylearn_url_classify(classifier_id),
add_headers(
"Accept" = "application/json",
"Authorization" = paste("Token ", key),
"Content-Type" =
"application/json"
),
body = request
)
}
# get results extract
monkeylearn_get_extractor <- function(request, key, extractor_id) {
POST(monkeylearn_url_extractor(extractor_id),
add_headers(
"Accept" = "application/json",
"Authorization" = paste("Token ", key),
"Content-Type" =
"application/json"
),
body = request
)
}
# parse results
monkeylearn_parse <- function(output, request_text) {
text <- content(output, as = "text",
encoding = "UTF-8")
temp <- fromJSON(text)
if(is(temp$result, "list")) {
results <- do.call("rbind", temp$result)
results$text_md5 <- unlist(mapply(rep, sapply(request_text,
digest::digest, algo = "md5",
simplify = TRUE,
USE.NAMES = FALSE),
unlist(vapply(temp$result, nrow,
FUN.VALUE = 0)),
SIMPLIFY = FALSE))
} else{
results <- as.data.frame(temp$result)
results$text_md5 <- sapply(request_text,
digest::digest, algo = "md5",
simplify = TRUE,
USE.NAMES = FALSE)
}
headers <- as.data.frame(headers(output))
headers$text_md5 <- list(sapply(request_text,
digest::digest, algo = "md5",
simplify = TRUE,
USE.NAMES = FALSE))
list(results = results,
headers = headers)
}
#' Retrieve Monkeylearn API key
#'
#' @return An Monkeylearn API Key
#'
#' @details Looks in env var \code{MONKEYLEARN_KEY}
#'
#' @keywords internal
#' @export
monkeylearn_key <- function(quiet = TRUE) {
pat <- Sys.getenv("MONKEYLEARN_KEY")
if (identical(pat, "")) {
return(NULL)
}
if (!quiet) {
message("Using Monkeylearn API Key from envvar MONKEYLEARN_KEY")
}
return(pat)
}