Delay/avoid 闪亮的服务器端功能重复，直到凭据之后

Question

我已经在 shinyapps.io 上安装了一个安全的应用程序，除了我的反应服务器功能开始运行外，一切都按预期运行，同时等待输入凭据，然后运行再次验证凭据。这似乎会导致应用程序使用额外的服务器时间和资源。有没有办法将服务器进程延迟到输入凭据之后。它的设置方式与 shinymanager 小插图中的示例相同：

library(shiny)
library(shinymanager)


credentials <- data.frame(user=c("USERNAME"), 
                          password=c("PASSWORD"), 
                          stringsAsFactors = FALSE)



ui <- fluidPage(
  tags$h2("My secure application"),
  
)

# Wrap your UI with secure_app
ui <- secure_app(ui)


server <- function(input, output, session) {
  
  # call the server part
  # check_credentials returns a function to authenticate users
  res_auth <- secure_server(
    check_credentials = check_credentials(credentials)
  )
  
  output$auth_output <- renderPrint({
    reactiveValuesToList(res_auth)
  })
  
  # all my server side functions here
  
}

shinyApp(ui, server)

Answer 1

认证成功后，我们可以使用observeEvent、eventReactive或bindEvent触发服务器部分的功能：

library(shiny)
library(shinymanager)

credentials <- data.frame(
  user = c("USERNAME"),
  password = c("PASSWORD"),
  stringsAsFactors = FALSE
)

ui <- fluidPage(
  tags$h2("My secure application"),
  verbatimTextOutput("auth_output"),
  plotOutput("myPlot")
)

# Wrap your UI with secure_app
ui <- secure_app(ui)


server <- function(input, output, session) {
  # call the server part
  # check_credentials returns a function to authenticate users
  res_auth <- secure_server(check_credentials = check_credentials(credentials))
  
  output$auth_output <- renderPrint({
    reactiveValuesToList(res_auth)
  })
  
  observeEvent(res_auth$user, {
    # all my server side functions here
    print("executing server functions...")
  })
}

shinyApp(ui, server)

Delay/avoid 闪亮的服务器端功能重复，直到凭据之后

Delay/avoid duplication of shiny server side functions until after credentials

r

shiny

shiny-reactivity

shinyapps

shinymanager