mirror of
https://github.com/rstudio/shiny.git
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b3dd7e5397
It is dangerous to set this on a per-process basis. If we even still want the ability to have observer errors not kill the session (debatable) we should do so by having an option on the session object that is set when the shiny server function runs. Not only does this remove support for the option, but now we will refuse to connect and will abort the session if the option is set to a non-NULL value. This is to prevent apps from moving forward with the assumption that their option will work, when it really won't. (I doubt anyone is using it anyway, it's so obscure...)
763 lines
25 KiB
R
763 lines
25 KiB
R
#' @include server-input-handlers.R
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appsByToken <- Map$new()
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# Provide a character representation of the WS that can be used
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# as a key in a Map.
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wsToKey <- function(WS) {
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as.character(WS$socket)
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}
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.globals$clients <- function(req) NULL
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clearClients <- function() {
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.globals$clients <- function(req) NULL
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}
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registerClient <- function(client) {
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.globals$clients <- append(.globals$clients, client)
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}
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.globals$resources <- list()
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.globals$showcaseDefault <- 0
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.globals$showcaseOverride <- FALSE
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#' Resource Publishing
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#'
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#' Adds a directory of static resources to Shiny's web server, with the given
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#' path prefix. Primarily intended for package authors to make supporting
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#' JavaScript/CSS files available to their components.
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#'
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#' @param prefix The URL prefix (without slashes). Valid characters are a-z,
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#' A-Z, 0-9, hyphen, period, and underscore; and must begin with a-z or A-Z.
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#' For example, a value of 'foo' means that any request paths that begin with
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#' '/foo' will be mapped to the given directory.
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#' @param directoryPath The directory that contains the static resources to be
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#' served.
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#'
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#' @details You can call \code{addResourcePath} multiple times for a given
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#' \code{prefix}; only the most recent value will be retained. If the
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#' normalized \code{directoryPath} is different than the directory that's
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#' currently mapped to the \code{prefix}, a warning will be issued.
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#'
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#' @seealso \code{\link{singleton}}
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#'
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#' @examples
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#' addResourcePath('datasets', system.file('data', package='datasets'))
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#'
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#' @export
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addResourcePath <- function(prefix, directoryPath) {
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prefix <- prefix[1]
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if (!grepl('^[a-z][a-z0-9\\-_.]*$', prefix, ignore.case=TRUE, perl=TRUE)) {
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stop("addResourcePath called with invalid prefix; please see documentation")
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}
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if (prefix %in% c('shared')) {
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stop("addResourcePath called with the reserved prefix '", prefix, "'; ",
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"please use a different prefix")
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}
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directoryPath <- normalizePath(directoryPath, mustWork=TRUE)
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existing <- .globals$resources[[prefix]]
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.globals$resources[[prefix]] <- list(directoryPath=directoryPath,
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func=staticHandler(directoryPath))
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}
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resourcePathHandler <- function(req) {
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if (!identical(req$REQUEST_METHOD, 'GET'))
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return(NULL)
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path <- req$PATH_INFO
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match <- regexpr('^/([^/]+)/', path, perl=TRUE)
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if (match == -1)
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return(NULL)
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len <- attr(match, 'capture.length')
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prefix <- substr(path, 2, 2 + len - 1)
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resInfo <- .globals$resources[[prefix]]
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if (is.null(resInfo))
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return(NULL)
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suffix <- substr(path, 2 + len, nchar(path))
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subreq <- as.environment(as.list(req, all.names=TRUE))
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subreq$PATH_INFO <- suffix
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subreq$SCRIPT_NAME <- paste(subreq$SCRIPT_NAME, substr(path, 1, 2 + len), sep='')
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return(resInfo$func(subreq))
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}
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#' Define Server Functionality
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#'
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#' Defines the server-side logic of the Shiny application. This generally
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#' involves creating functions that map user inputs to various kinds of output.
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#' In older versions of Shiny, it was necessary to call \code{shinyServer()} in
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#' the \code{server.R} file, but this is no longer required as of Shiny 0.10.
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#' Now the \code{server.R} file may simply return the appropriate server
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#' function (as the last expression in the code), without calling
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#' \code{shinyServer()}.
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#'
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#' Call \code{shinyServer} from your application's \code{server.R}
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#' file, passing in a "server function" that provides the server-side logic of
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#' your application.
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#'
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#' The server function will be called when each client (web browser) first loads
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#' the Shiny application's page. It must take an \code{input} and an
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#' \code{output} parameter. Any return value will be ignored. It also takes an
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#' optional \code{session} parameter, which is used when greater control is
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#' needed.
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#'
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#' See the \href{http://rstudio.github.com/shiny/tutorial/}{tutorial} for more
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#' on how to write a server function.
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#'
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#' @param func The server function for this application. See the details section
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#' for more information.
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#'
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#' @examples
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#' \dontrun{
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#' # A very simple Shiny app that takes a message from the user
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#' # and outputs an uppercase version of it.
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#' shinyServer(function(input, output, session) {
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#' output$uppercase <- renderText({
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#' toupper(input$message)
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#' })
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#' })
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#'
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#'
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#' # It is also possible for a server.R file to simply return the function,
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#' # without calling shinyServer().
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#' # For example, the server.R file could contain just the following:
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#' function(input, output, session) {
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#' output$uppercase <- renderText({
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#' toupper(input$message)
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#' })
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#' }
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#' }
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#'
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#' @export
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shinyServer <- function(func) {
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.globals$server <- list(func)
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invisible(func)
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}
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decodeMessage <- function(data) {
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readInt <- function(pos) {
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packBits(rawToBits(data[pos:(pos+3)]), type='integer')
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}
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if (readInt(1) != 0x01020202L) {
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# Treat message as UTF-8
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charData <- rawToChar(data)
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Encoding(charData) <- 'UTF-8'
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return(jsonlite::fromJSON(charData, simplifyVector=FALSE))
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}
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i <- 5
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parts <- list()
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while (i <= length(data)) {
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length <- readInt(i)
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i <- i + 4
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if (length != 0)
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parts <- append(parts, list(data[i:(i+length-1)]))
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else
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parts <- append(parts, list(raw(0)))
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i <- i + length
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}
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mainMessage <- decodeMessage(parts[[1]])
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mainMessage$blobs <- parts[2:length(parts)]
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return(mainMessage)
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}
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createAppHandlers <- function(httpHandlers, serverFuncSource) {
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appvars <- new.env()
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appvars$server <- NULL
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sys.www.root <- system.file('www', package='shiny')
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# This value, if non-NULL, must be present on all HTTP and WebSocket
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# requests as the Shiny-Shared-Secret header or else access will be
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# denied (403 response for HTTP, and instant close for websocket).
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sharedSecret <- getOption('shiny.sharedSecret')
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appHandlers <- list(
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http = joinHandlers(c(
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sessionHandler,
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httpHandlers,
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sys.www.root,
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resourcePathHandler,
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reactLogHandler)),
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ws = function(ws) {
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if (!is.null(sharedSecret)
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&& !identical(sharedSecret, ws$request$HTTP_SHINY_SHARED_SECRET)) {
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ws$close()
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return(TRUE)
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}
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if (!is.null(getOption("shiny.observer.error", NULL))) {
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warning(
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call. = FALSE,
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"options(shiny.observer.error) is no longer supported; please unset it!"
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)
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stopApp()
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}
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shinysession <- ShinySession$new(ws)
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appsByToken$set(shinysession$token, shinysession)
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shinysession$setShowcase(.globals$showcaseDefault)
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messageHandler <- function(binary, msg) {
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withReactiveDomain(shinysession, {
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# To ease transition from websockets-based code. Should remove once we're stable.
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if (is.character(msg))
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msg <- charToRaw(msg)
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if (isTRUE(getOption('shiny.trace'))) {
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if (binary)
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message("RECV ", '$$binary data$$')
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else
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message("RECV ", rawToChar(msg))
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}
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if (identical(charToRaw("\003\xe9"), msg))
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return()
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msg <- decodeMessage(msg)
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# Do our own list simplifying here. sapply/simplify2array give names to
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# character vectors, which is rarely what we want.
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if (!is.null(msg$data)) {
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for (name in names(msg$data)) {
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val <- msg$data[[name]]
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splitName <- strsplit(name, ':')[[1]]
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if (length(splitName) > 1) {
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msg$data[[name]] <- NULL
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if (!inputHandlers$containsKey(splitName[[2]])){
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# No input handler registered for this type
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stop("No handler registered for for type ", name)
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}
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msg$data[[ splitName[[1]] ]] <-
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inputHandlers$get(splitName[[2]])(
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val,
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shinysession,
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splitName[[1]] )
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}
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else if (is.list(val) && is.null(names(val))) {
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val_flat <- unlist(val, recursive = TRUE)
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if (is.null(val_flat)) {
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# This is to assign NULL instead of deleting the item
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msg$data[name] <- list(NULL)
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} else {
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msg$data[[name]] <- val_flat
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}
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}
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}
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}
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switch(
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msg$method,
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init = {
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serverFunc <- withReactiveDomain(NULL, serverFuncSource())
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if (!identicalFunctionBodies(serverFunc, appvars$server)) {
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appvars$server <- serverFunc
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if (!is.null(appvars$server))
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{
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# Tag this function as the Shiny server function. A debugger may use this
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# tag to give this function special treatment.
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# It's very important that it's appvars$server itself and NOT a copy that
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# is invoked, otherwise new breakpoints won't be picked up.
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attr(appvars$server, "shinyServerFunction") <- TRUE
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registerDebugHook("server", appvars, "Server Function")
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}
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}
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# Check for switching into/out of showcase mode
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if (.globals$showcaseOverride &&
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exists(".clientdata_url_search", where = msg$data)) {
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mode <- showcaseModeOfQuerystring(msg$data$.clientdata_url_search)
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if (!is.null(mode))
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shinysession$setShowcase(mode)
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}
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shinysession$manageInputs(msg$data)
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# The client tells us what singletons were rendered into
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# the initial page
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if (!is.null(msg$data$.clientdata_singletons)) {
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shinysession$singletons <- strsplit(
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msg$data$.clientdata_singletons, ',')[[1]]
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}
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local({
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args <- list(
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input=shinysession$input,
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output=.createOutputWriter(shinysession))
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# The clientData and session arguments are optional; check if
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# each exists
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if ('clientData' %in% names(formals(serverFunc)))
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args$clientData <- shinysession$clientData
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if ('session' %in% names(formals(serverFunc)))
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args$session <- shinysession
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withReactiveDomain(shinysession, {
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do.call(appvars$server, args)
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})
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})
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},
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update = {
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shinysession$manageInputs(msg$data)
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},
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shinysession$dispatch(msg)
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)
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shinysession$manageHiddenOutputs()
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if (exists(".shiny__stdout", globalenv()) &&
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exists("HTTP_GUID", ws$request)) {
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# safe to assume we're in shiny-server
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shiny_stdout <- get(".shiny__stdout", globalenv())
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# eNter a flushReact
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writeLines(paste("_n_flushReact ", get("HTTP_GUID", ws$request),
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" @ ", sprintf("%.3f", as.numeric(Sys.time())),
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sep=""), con=shiny_stdout)
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flush(shiny_stdout)
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flushReact()
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# eXit a flushReact
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writeLines(paste("_x_flushReact ", get("HTTP_GUID", ws$request),
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" @ ", sprintf("%.3f", as.numeric(Sys.time())),
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sep=""), con=shiny_stdout)
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flush(shiny_stdout)
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} else {
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flushReact()
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}
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lapply(appsByToken$values(), function(shinysession) {
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shinysession$flushOutput()
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NULL
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})
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})
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}
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ws$onMessage(function(binary, msg) {
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# If unhandled errors occur, make sure they get properly logged
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withLogErrors(messageHandler(binary, msg))
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})
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ws$onClose(function() {
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shinysession$wsClosed()
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appsByToken$remove(shinysession$token)
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})
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return(TRUE)
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}
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)
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return(appHandlers)
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}
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getEffectiveBody <- function(func) {
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# Note: NULL values are OK. isS4(NULL) returns FALSE, body(NULL)
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# returns NULL.
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if (isS4(func) && class(func) == "functionWithTrace")
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body(func@original)
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else
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body(func)
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}
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identicalFunctionBodies <- function(a, b) {
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identical(getEffectiveBody(a), getEffectiveBody(b))
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}
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handlerManager <- HandlerManager$new()
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addSubApp <- function(appObj, autoRemove = TRUE) {
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path <- createUniqueId(16, "/app")
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appHandlers <- createAppHandlers(appObj$httpHandler, appObj$serverFuncSource)
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# remove the leading / from the path so a relative path is returned
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# (needed for the case where the root URL for the Shiny app isn't /, such
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# as portmapped URLs)
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finalPath <- paste(
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substr(path, 2, nchar(path)),
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"/?w=", workerId(),
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"&__subapp__=1",
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sep="")
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handlerManager$addHandler(routeHandler(path, appHandlers$http), finalPath)
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handlerManager$addWSHandler(routeWSHandler(path, appHandlers$ws), finalPath)
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if (autoRemove) {
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# If a session is currently active, remove this subapp automatically when
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# the current session ends
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onReactiveDomainEnded(getDefaultReactiveDomain(), function() {
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removeSubApp(finalPath)
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})
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}
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return(finalPath)
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}
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removeSubApp <- function(path) {
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handlerManager$removeHandler(path)
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handlerManager$removeWSHandler(path)
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}
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startApp <- function(appObj, port, host, quiet) {
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appHandlers <- createAppHandlers(appObj$httpHandler, appObj$serverFuncSource)
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handlerManager$addHandler(appHandlers$http, "/", tail = TRUE)
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handlerManager$addWSHandler(appHandlers$ws, "/", tail = TRUE)
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if (is.numeric(port) || is.integer(port)) {
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if (!quiet) {
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message('\n', 'Listening on http://', host, ':', port)
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}
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return(startServer(host, port, handlerManager$createHttpuvApp()))
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} else if (is.character(port)) {
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if (!quiet) {
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message('\n', 'Listening on domain socket ', port)
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}
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mask <- attr(port, 'mask')
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return(startPipeServer(port, mask, handlerManager$createHttpuvApp()))
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}
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}
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# Run an application that was created by \code{\link{startApp}}. This
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# function should normally be called in a \code{while(TRUE)} loop.
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serviceApp <- function() {
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if (timerCallbacks$executeElapsed()) {
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for (shinysession in appsByToken$values()) {
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shinysession$manageHiddenOutputs()
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}
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flushReact()
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for (shinysession in appsByToken$values()) {
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shinysession$flushOutput()
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}
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}
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# If this R session is interactive, then call service() with a short timeout
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# to keep the session responsive to user input
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maxTimeout <- ifelse(interactive(), 100, 1000)
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timeout <- max(1, min(maxTimeout, timerCallbacks$timeToNextEvent()))
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service(timeout)
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}
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.shinyServerMinVersion <- '0.3.4'
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#' Run Shiny Application
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#'
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#' Runs a Shiny application. This function normally does not return; interrupt R
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#' to stop the application (usually by pressing Ctrl+C or Esc).
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#'
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#' The host parameter was introduced in Shiny 0.9.0. Its default value of
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#' \code{"127.0.0.1"} means that, contrary to previous versions of Shiny, only
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#' the current machine can access locally hosted Shiny apps. To allow other
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#' clients to connect, use the value \code{"0.0.0.0"} instead (which was the
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#' value that was hard-coded into Shiny in 0.8.0 and earlier).
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#'
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#' @param appDir The application to run. Should be one of the following:
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#' \itemize{
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#' \item A directory containing \code{server.R}, plus, either \code{ui.R} or
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#' a \code{www} directory that contains the file \code{index.html}.
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#' \item A directory containing \code{app.R}.
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#' \item An \code{.R} file containing a Shiny application, ending with an
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#' expression that produces a Shiny app object.
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#' \item A list with \code{ui} and \code{server} components.
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#' \item A Shiny app object created by \code{\link{shinyApp}}.
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#' }
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#' @param port The TCP port that the application should listen on. If the
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#' \code{port} is not specified, and the \code{shiny.port} option is set (with
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#' \code{options(shiny.port = XX)}), then that port will be used. Otherwise,
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#' use a random port.
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#' @param launch.browser If true, the system's default web browser will be
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#' launched automatically after the app is started. Defaults to true in
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#' interactive sessions only. This value of this parameter can also be a
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#' function to call with the application's URL.
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#' @param host The IPv4 address that the application should listen on. Defaults
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#' to the \code{shiny.host} option, if set, or \code{"127.0.0.1"} if not. See
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#' Details.
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#' @param workerId Can generally be ignored. Exists to help some editions of
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#' Shiny Server Pro route requests to the correct process.
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#' @param quiet Should Shiny status messages be shown? Defaults to FALSE.
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#' @param display.mode The mode in which to display the application. If set to
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#' the value \code{"showcase"}, shows application code and metadata from a
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#' \code{DESCRIPTION} file in the application directory alongside the
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#' application. If set to \code{"normal"}, displays the application normally.
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#' Defaults to \code{"auto"}, which displays the application in the mode given
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#' in its \code{DESCRIPTION} file, if any.
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#'
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#' @examples
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#' \dontrun{
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#' # Start app in the current working directory
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#' runApp()
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#'
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#' # Start app in a subdirectory called myapp
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#' runApp("myapp")
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#' }
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#'
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#' ## Only run this example in interactive R sessions
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#' if (interactive()) {
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#' # Apps can be run without a server.r and ui.r file
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#' runApp(list(
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#' ui = bootstrapPage(
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#' numericInput('n', 'Number of obs', 100),
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#' plotOutput('plot')
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#' ),
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#' server = function(input, output) {
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#' output$plot <- renderPlot({ hist(runif(input$n)) })
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#' }
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#' ))
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#'
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#'
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#' # Running a Shiny app object
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#' app <- shinyApp(
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#' ui = bootstrapPage(
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#' numericInput('n', 'Number of obs', 100),
|
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#' plotOutput('plot')
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#' ),
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#' server = function(input, output) {
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#' output$plot <- renderPlot({ hist(runif(input$n)) })
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#' }
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#' )
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#' runApp(app)
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#' }
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#' @export
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runApp <- function(appDir=getwd(),
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port=getOption('shiny.port'),
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launch.browser=getOption('shiny.launch.browser',
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|
interactive()),
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host=getOption('shiny.host', '127.0.0.1'),
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workerId="", quiet=FALSE,
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display.mode=c("auto", "normal", "showcase")) {
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on.exit({
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handlerManager$clear()
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}, add = TRUE)
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|
|
|
|
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if (is.null(host) || is.na(host))
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host <- '0.0.0.0'
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|
|
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# Make warnings print immediately
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ops <- options(warn = 1)
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on.exit(options(ops), add = TRUE)
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|
|
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workerId(workerId)
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|
|
|
if (nzchar(Sys.getenv('SHINY_PORT'))) {
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|
# If SHINY_PORT is set, we're running under Shiny Server. Check the version
|
|
# to make sure it is compatible. Older versions of Shiny Server don't set
|
|
# SHINY_SERVER_VERSION, those will return "" which is considered less than
|
|
# any valid version.
|
|
ver <- Sys.getenv('SHINY_SERVER_VERSION')
|
|
if (utils::compareVersion(ver, .shinyServerMinVersion) < 0) {
|
|
warning('Shiny Server v', .shinyServerMinVersion,
|
|
' or later is required; please upgrade!')
|
|
}
|
|
}
|
|
|
|
# Showcase mode is disabled by default; it must be explicitly enabled in
|
|
# either the DESCRIPTION file for directory-based apps, or via
|
|
# the display.mode parameter. The latter takes precedence.
|
|
setShowcaseDefault(0)
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|
|
|
# If appDir specifies a path, and display mode is specified in the
|
|
# DESCRIPTION file at that path, apply it here.
|
|
if (is.character(appDir)) {
|
|
# if appDir specifies a .R file (single-file Shiny app), look for the
|
|
# DESCRIPTION in the parent directory
|
|
desc <- file.path.ci(
|
|
if (tolower(tools::file_ext(appDir)) == "r")
|
|
dirname(appDir)
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|
else
|
|
appDir, "DESCRIPTION")
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|
if (file.exists(desc)) {
|
|
con <- file(desc, encoding = checkEncoding(desc))
|
|
on.exit(close(con), add = TRUE)
|
|
settings <- read.dcf(con)
|
|
if ("DisplayMode" %in% colnames(settings)) {
|
|
mode <- settings[1,"DisplayMode"]
|
|
if (mode == "Showcase") {
|
|
setShowcaseDefault(1)
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
# If display mode is specified as an argument, apply it (overriding the
|
|
# value specified in DESCRIPTION, if any).
|
|
display.mode <- match.arg(display.mode)
|
|
if (display.mode == "normal")
|
|
setShowcaseDefault(0)
|
|
else if (display.mode == "showcase")
|
|
setShowcaseDefault(1)
|
|
|
|
require(shiny)
|
|
|
|
# determine port if we need to
|
|
if (is.null(port)) {
|
|
|
|
# Try up to 20 random ports. If we don't succeed just plow ahead
|
|
# with the final value we tried, and let the "real" startServer
|
|
# somewhere down the line fail and throw the error to the user.
|
|
#
|
|
# If we (think we) succeed, save the value as .globals$lastPort,
|
|
# and try that first next time the user wants a random port.
|
|
|
|
for (i in 1:20) {
|
|
if (!is.null(.globals$lastPort)) {
|
|
port <- .globals$lastPort
|
|
.globals$lastPort <- NULL
|
|
}
|
|
else {
|
|
# Try up to 20 random ports
|
|
port <- p_randomInt(3000, 8000)
|
|
}
|
|
|
|
# Test port to see if we can use it
|
|
tmp <- try(startServer(host, port, list()), silent=TRUE)
|
|
if (!inherits(tmp, 'try-error')) {
|
|
stopServer(tmp)
|
|
.globals$lastPort <- port
|
|
break
|
|
}
|
|
}
|
|
}
|
|
|
|
appParts <- as.shiny.appobj(appDir)
|
|
# Set up the onEnd before we call onStart, so that it gets called even if an
|
|
# error happens in onStart.
|
|
if (!is.null(appParts$onEnd))
|
|
on.exit(appParts$onEnd(), add = TRUE)
|
|
if (!is.null(appParts$onStart))
|
|
appParts$onStart()
|
|
|
|
server <- startApp(appParts, port, host, quiet)
|
|
|
|
on.exit({
|
|
stopServer(server)
|
|
}, add = TRUE)
|
|
|
|
if (!is.character(port)) {
|
|
# http://0.0.0.0/ doesn't work on QtWebKit (i.e. RStudio viewer)
|
|
browseHost <- if (identical(host, "0.0.0.0")) "127.0.0.1" else host
|
|
|
|
appUrl <- paste("http://", browseHost, ":", port, sep="")
|
|
if (is.function(launch.browser))
|
|
launch.browser(appUrl)
|
|
else if (launch.browser)
|
|
utils::browseURL(appUrl)
|
|
} else {
|
|
appUrl <- NULL
|
|
}
|
|
|
|
# call application hooks
|
|
callAppHook("onAppStart", appUrl)
|
|
on.exit({
|
|
callAppHook("onAppStop", appUrl)
|
|
}, add = TRUE)
|
|
|
|
.globals$retval <- NULL
|
|
.globals$stopped <- FALSE
|
|
# Top-level ..stacktraceoff..; matches with ..stacktraceon in observe(),
|
|
# reactive(), Callbacks$invoke(), and others
|
|
..stacktraceoff..(
|
|
captureStackTraces(
|
|
while (!.globals$stopped) {
|
|
serviceApp()
|
|
Sys.sleep(0.001)
|
|
}
|
|
)
|
|
)
|
|
|
|
return(.globals$retval)
|
|
}
|
|
|
|
#' Stop the currently running Shiny app
|
|
#'
|
|
#' Stops the currently running Shiny app, returning control to the caller of
|
|
#' \code{\link{runApp}}.
|
|
#'
|
|
#' @param returnValue The value that should be returned from
|
|
#' \code{\link{runApp}}.
|
|
#'
|
|
#' @export
|
|
stopApp <- function(returnValue = invisible()) {
|
|
.globals$retval <- returnValue
|
|
.globals$stopped <- TRUE
|
|
httpuv::interrupt()
|
|
}
|
|
|
|
#' Run Shiny Example Applications
|
|
#'
|
|
#' Launch Shiny example applications, and optionally, your system's web browser.
|
|
#'
|
|
#' @param example The name of the example to run, or \code{NA} (the default) to
|
|
#' list the available examples.
|
|
#' @param port The TCP port that the application should listen on. Defaults to
|
|
#' choosing a random port.
|
|
#' @param launch.browser If true, the system's default web browser will be
|
|
#' launched automatically after the app is started. Defaults to true in
|
|
#' interactive sessions only.
|
|
#' @param host The IPv4 address that the application should listen on. Defaults
|
|
#' to the \code{shiny.host} option, if set, or \code{"127.0.0.1"} if not.
|
|
#' @param display.mode The mode in which to display the example. Defaults to
|
|
#' \code{showcase}, but may be set to \code{normal} to see the example without
|
|
#' code or commentary.
|
|
#'
|
|
#' @examples
|
|
#' ## Only run this example in interactive R sessions
|
|
#' if (interactive()) {
|
|
#' # List all available examples
|
|
#' runExample()
|
|
#'
|
|
#' # Run one of the examples
|
|
#' runExample("01_hello")
|
|
#'
|
|
#' # Print the directory containing the code for all examples
|
|
#' system.file("examples", package="shiny")
|
|
#' }
|
|
#' @export
|
|
runExample <- function(example=NA,
|
|
port=NULL,
|
|
launch.browser=getOption('shiny.launch.browser',
|
|
interactive()),
|
|
host=getOption('shiny.host', '127.0.0.1'),
|
|
display.mode=c("auto", "normal", "showcase")) {
|
|
examplesDir <- system.file('examples', package='shiny')
|
|
dir <- resolve(examplesDir, example)
|
|
if (is.null(dir)) {
|
|
if (is.na(example)) {
|
|
errFun <- message
|
|
errMsg <- ''
|
|
}
|
|
else {
|
|
errFun <- stop
|
|
errMsg <- paste('Example', example, 'does not exist. ')
|
|
}
|
|
|
|
errFun(errMsg,
|
|
'Valid examples are "',
|
|
paste(list.files(examplesDir), collapse='", "'),
|
|
'"')
|
|
}
|
|
else {
|
|
runApp(dir, port = port, host = host, launch.browser = launch.browser,
|
|
display.mode = display.mode)
|
|
}
|
|
}
|