求助：怎么才能让Shiny 应用，即使关闭了浏览器都能继续运作呢？

僕编写了个外汇秒钟价格数据采集应用 Data Collection，不过浏览器一旦关闭后，所有运作都即可停止，参考了Persistent R sessions in Shiny Server?，请问有啥其它管道可以让shiny服务器即使在关闭浏览器后也能继续运行呢？

? 僕也在RStudio社区发问了How to keep shiny sever operating even though closed browser?，希望有解决方案... ?

require('shiny')
require('shinyTime')
#'@ require('rdrop2')
require('magrittr')
require('plyr')
require('dplyr')
require('stringr')
require('data.table')
#'@ require('rvest')
require('quantmod')
require('TFX')
require('lubridate')
require('ggplot2')
require('DT')

#'@ drop_auth()
## email : scibrokes_demo@gmail.com
## pass : trader888
#
# https://github.com/karthik/rdrop2
#
#'@ token <- drop_auth()
#'@ saveRDS(token, "droptoken.rds")
# Upload droptoken to your server
# ******** WARNING ********
# Losing this file will give anyone 
# complete control of your Dropbox account
# You can then revoke the rdrop2 app from your
# dropbox account and start over.
# ******** WARNING ********
# read it back with readRDS
#'@ token <- readRDS("droptoken.rds")
# Then pass the token to each drop_ function
#'@ drop_acc(dtoken = token)
#'@ token <<- readRDS("droptoken.rds")
# Then pass the token to each drop_ function
#'@ drop_acc(dtoken = token)

# === Data =====================================================
Sys.setenv(TZ = 'Asia/Tokyo')
zones <- attr(as.POSIXlt(now('Asia/Tokyo')), 'tzone')
zone <- ifelse(zones[[1]] == '', paste(zones[-1], collapse = '/'), zones[[1]])

# === UI =====================================================
ui <- shinyUI(fluidPage(
  
  titlePanel(
    tags$a(href='https://github.com/scibrokes', target='_blank', 
           tags$img(height = '120px', alt='HFT', #align='right', 
                    src='https://raw.githubusercontent.com/scibrokes/real-time-fxcm/master/www/HFT.jpg'))), 
  pageWithSidebar(
    mainPanel(
      tabsetPanel(
        tabPanel('Data Price', 
                 tabsetPanel(
                   tabPanel('Board', 
                            h3('Real Time Board'), 
                            p(strong(paste0('Current time (', zone, '):')),
                              textOutput('currentTime')),
                            br(), 
                            p(strong('Latest FX Quotes:'),
                              tableOutput('fxdata'), 
                              checkboxInput('pause', 'Pause updates', FALSE))), 
                   tabPanel('Chart', 
                            h3('Real Time Chart'), 
                            p(strong(paste0('Current time (', zone, '):')),
                              textOutput('currentTime2')),
                            br(), 
                            plotOutput("plotPrice")#, 
                            #'@ tags$hr(),
                            #'@ plotOutput("plotAskPrice")
                            ), 
                   tabPanel('Data', 
                            h3('Data Download'), 
                            p(strong(paste0('Current time (', zone, '):')),
                              textOutput('currentTime3')), 
                            p('The time zone of data in GMT, Current time (GMT) :', 
                              textOutput('currentTime4')), 
                            dataTableOutput('fxDataTable'), 
                            p(strong('Refresh'), 'button will collect the latest dataset ', 
                              '(time unit in seconds).'), 
                            p('Please becareful, once you click on', 
                              strong('Reset'), 'button, ', 
                              'all data will be lost. Kindly download the dataset ', 
                              'as csv format prior to reset it.'), 
                            actionButton('refresh', 'Refresh', class = 'btn-primary'), 
                            downloadButton('downloadData', 'Download'), 
                            actionButton('reset', 'Reset', class = 'btn-danger')))), 
        
        tabPanel('Appendix', 
                 tabsetPanel(
                   tabPanel('Reference', 
                            h3('Speech'), 
                            p('I try to refer to the idea from below reference to create this web ', 
                              'application for data collection.'), 
                            p(HTML("<a href='https://beta.rstudioconnect.com/content/3138/'>Q1App2</a>"), 
                              '(', strong('Q1App2'), 'inside 2nd reference link at below', 
                              strong('Reference'), 'tab) for algorithmic trading. Kindly browse over', 
                              HTML("<a href='https://github.com/scibrokes/real-time-fxcm'>Real Time FXCM</a>"), 
                              'for more information about high frequency algorithmic trading.'), 
                            br(), 
                            h3('Reference'), 
                            p('01. ', HTML("<a href='https://github.com/cran/TFX'>TFX r package</a>")), 
                            p('02. ', HTML("<a href='https://www.fxcmapps.com/apps/basic-historical-data-downloader/'>Basic Historical Data Downloader</a>")), 
                            p('03. ', HTML("<a href='https://github.com/englianhu/binary.com-interview-question'>binary.com : Job Application - Quantitative Analyst</a>"))), 
                   
                   tabPanel('Author', 
                            h3('Author'), 
                            tags$iframe(src = 'https://beta.rstudioconnect.com/content/3091/ryo-eng.html', 
                                        height = 800, width = '100%', frameborder = 0)))))), 
    br(), 
    p('Powered by - Copyright® Intellectual Property Rights of ', 
      tags$a(href='http://www.scibrokes.com', target='_blank', 
             tags$img(height = '20px', alt='scibrokes', #align='right', 
                      src='https://raw.githubusercontent.com/scibrokes/betting-strategy-and-model-validation/master/regressionApps/oda-army.jpg')), 
      HTML("<a href='http://www.scibrokes.com'>Scibrokes®</a>")))))

# === Server =====================================================
server <- shinyServer(function(input, output, session){
  
  output$currentTime <- renderText({
    # Forces invalidation in 1000 milliseconds
    invalidateLater(1000, session)
    as.character(now('Asia/Tokyo'))
  })
  
  output$currentTime2 <- renderText({
    # Forces invalidation in 1000 milliseconds
    invalidateLater(1000, session)
    as.character(now('Asia/Tokyo'))
  })
  
  output$currentTime3 <- renderText({
    # Forces invalidation in 1000 milliseconds
    invalidateLater(1000, session)
    as.character(now('Asia/Tokyo'))
  })
  
  output$currentTime4 <- renderText({
    # Forces invalidation in 1000 milliseconds
    invalidateLater(1000, session)
    as.character(now('GMT'))
  })
  
  fetchData <- reactive({
    if (!input$pause)
      invalidateLater(750)
    qtf <- QueryTrueFX()
    qtf %<>% mutate(TimeStamp = as.character(TimeStamp))
    names(qtf)[6] <- 'TimeStamp (GMT)'
    return(qtf)
  })
  
  output$fxdata <- renderTable({
    update_data()
    
    fetchData()
  }, digits = 5, row.names = FALSE)
  
  # Function to get new observations
  get_new_data <- function(){
    readLines('http://webrates.truefx.com/rates/connect.html')
    }
  
  ## ----------------- Start fxData ---------------------------
  # Initialize fxData
  fxData <<- get_new_data()
  
  # Function to update fxData, latest data will be showing upside.
  update_data <- function(){
    fxData <<- rbind(fxData, get_new_data())#  %>% unique
    saveRDS(fxData, paste0(str_replace_all(now('GMT'), ':', 'T'), 'GMT.rds'))
    }
  
  output$plotPrice <- renderPlot({
    invalidateLater(1000, session)
    #update_data()
    
    if(any(file.exists(paste0(dir(pattern = '.rds'))))) {
      realPlot <<- llply(dir(pattern = '.rds'), readRDS)
      realPlot <<- do.call(rbind, realPlot) %>% unique
      realPlot <<- ldply(realPlot, ParseTrueFX) %>% unique %>% 
        filter(Symbol == 'USD/JPY')
    }
    
    if(nrow(realPlot) > 10) {
      
      ggplot(tail(realPlot, 10), aes(TimeStamp)) + 
        geom_line(aes(y = Bid.Price, colour = 'Bid.Price')) + 
        geom_line(aes(y = Ask.Price, colour = 'Ask.Price')) + 
        ggtitle('Real Time USD/JPY')
      
    } else {
      
      ggplot(realPlot, aes(TimeStamp)) + 
        geom_line(aes(y = Bid.Price, colour = 'Bid.Price')) + 
        geom_line(aes(y = Ask.Price, colour = 'Ask.Price')) + 
        ggtitle('Real Time USD/JPY')
    }
    })
  
  #'@ output$plotAskPrice <- renderPlot({
  #'@   invalidateLater(1000, session)
    #'@ update_data()
  #'@   
  #'@   dt <- terms()
  #'@   if(nrow(dt) > 40) {
  #'@     ggplot(data = tail(dt, 40), aes(x = TimeStamp, y = Ask.Price, 
  #'@                           group = Symbol, colour = Symbol)) +
  #'@       geom_line() + geom_point( size = 4, shape = 21, fill = 'white') + 
  #'@       ggtitle('Real Time Graph 2 : Forex Ask Price')
  #'@     
  #'@   } else {
  #'@     ggplot(data = dt, aes(x = TimeStamp, y = Ask.Price, 
  #'@                           group = Symbol, colour = Symbol)) +
  #'@       geom_line() + geom_point( size = 4, shape = 21, fill = 'white') + 
  #'@       ggtitle('Real Time Graph 2 : Forex Ask Price')
  #'@   }
  #'@ })
  ## ------------------ End fxData ----------------------------
  
  terms <- reactive({
    input$refresh

    if(any(file.exists(paste0(dir(pattern = '.rds'))))) {
      realData <<- llply(dir(pattern = '.rds'), readRDS)
      realData <<- do.call(rbind, realData) %>% unique
      realData <<- ldply(realData, ParseTrueFX) %>% unique
    }
  })
  
  # Downloadable csv
  output$downloadData <- downloadHandler(
    filename = function() {
      paste('fxData.csv', sep = '')
    },
    content = function(file) {
      fwrite(terms(), file, row.names = FALSE)
    }
  )
  
  observe({
    if(input$reset){
      do.call(file.remove, list(dir(pattern = '.rds')))
      rm(list = ls())
      stopApp('Delete all downloaded dataset!')
    }
  })
  
  output$fxDataTable <- renderDataTable({
    
    terms() %>% datatable(
      caption = "Table : Forex", 
      escape = FALSE, filter = "top", rownames = FALSE, 
      extensions = list("ColReorder" = NULL, "RowReorder" = NULL, 
                        "Buttons" = NULL, "Responsive" = NULL), 
      options = list(dom = 'BRrltpi', scrollX = TRUE, #autoWidth = TRUE, 
                     lengthMenu = list(c(10, 50, 100, -1), c('10', '50', '100', 'All')), 
                     ColReorder = TRUE, rowReorder = TRUE, 
                     buttons = list('copy', 'print', 
                                    list(extend = 'collection', 
                                         buttons = c('csv', 'excel', 'pdf'), 
                                         text = 'Download'), I('colvis'))))
  })
  
  # Set this to "force" instead of TRUE for testing locally (without Shiny Server)
  session$allowReconnect(TRUE)
  llply(c('plotPrice', 'fxdata', 'fxDataTable'), function(x) {
    outputOptions(output, x, suspendWhenHidden = FALSE)
  })
})

shinyApp(ui, server)

参考文献：

• R Shiny Tabsets simultaneous processing
• Shiny only calculating when the user is looking at the output
• Reconnecting to Shiny apps
• Persistent R sessions in Shiny Server?