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#' Generates a layer.
#'
#' Generates annotations on a given layer for all transcripts in the corpus.
#'
#' @param labbcat.url URL to the LaBB-CAT instance
#' @param layer.id The ID of the layer to generate.
#' @param no.progress TRUE to suppress visual progress bar. Otherwise, progress bar will be
#' shown when interactive().
#' @return The final status of the layer generation task.
#'
#' @seealso
#' \code{\link{getAllUtterances}}
#' @examples
#' \dontrun{
#' ## define the LaBB-CAT URL
#' labbcat.url <- "https://labbcat.canterbury.ac.nz/demo/"
#'
#' ## Generate all phonemic transcription annotations
#' generateLayer(labbcat.url, "phonemes")
#' }
#'
#' @keywords layer annotation label
#'
generateLayer <- function(labbcat.url, layer.id, no.progress=FALSE) {
## make request
parameters <- list(
layerId=layer.id,
sure="true")
resp <- http.post(labbcat.url, "admin/layers/regenerate", parameters)
## check the reponse
if (is.null(resp)) return()
resp.content <- httr::content(resp, as="text", encoding="UTF-8")
if (httr::status_code(resp) != 200) { # 200 = OK
print(paste("ERROR: ", httr::http_status(resp)$message))
print(resp.content)
return()
}
resp.json <- jsonlite::fromJSON(resp.content)
for (error in resp.json$errors) print(error)
if (length(resp.json$errors)) return()
## wait for task to complete
threadId <- resp.json$model$threadId
pb <- NULL
if (interactive() && !no.progress) {
pb <- txtProgressBar(min = 0, max = 100, style = 3)
}
thread <- thread.get(labbcat.url, threadId)
if (is.null(thread)) {
return()
}
while (thread$running) {
if (!is.null(pb) && !is.null(thread$percentComplete)) {
setTxtProgressBar(pb, thread$percentComplete)
}
Sys.sleep(1)
thread <- thread.get(labbcat.url, threadId)
if (is.null(thread)) {
return()
}
} # poll until finished
if (!is.null(pb)) {
if (!is.null(thread$percentComplete)) {
setTxtProgressBar(pb, thread$percentComplete)
}
close(pb)
if (!is.null(thread$status)) {
cat(paste(thread$status, "\n", sep=""))
}
}
## free the thread so it's not using server resources
http.get(labbcat.url, "threads", list(threadId=threadId, command="release"))
if (!is.null(pb)) { ## if there was a progress bar,
close(pb)
}
return(thread$status)
}
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