How do I write to a bigquery table from shiny? - shiny

Question

I'm trying to write a shiny app that takes a file as an input and uploads the data in that file to a bigquery table where some other stuff will go on. Everything appears to be working fine in terms of getting the data into my app, but when I try to upload the data to bigquery, nothing happens. No error messages, just nothing.
I can run the code on its own and it executes just fine. I'm having a little trouble figuring out how to create a reproducible example because you can't write to a public dataset, but I've included my code below.
Additional info:
working directory contains my .httr-oauth file
data is visible in my shiny app
Please let me know if there's something I can add to make this question easier to answer. Thanks.
############# UI ############
#
library(shiny)
shinyUI(fluidPage(
# Application title
titlePanel("Upload"),
# Sidebar with a slider input for number of bins
sidebarLayout(
sidebarPanel(
fileInput('list', 'Choose file to upload',
accept = c(
'text/csv',
'text/comma-separated-values',
'.csv'
)),
tags$hr(),
textInput('sql', 'Or give a query to get the customer_ids you want'),
tags$hr(),
actionButton('go', 'Go')
),
# Show a plot of the generated distribution
mainPanel(
tableOutput('log')
)
)
))
############# server ##############
### setting up the environment
library(shiny)
library(data.table)
library(bigrquery)
### setting up the constants
project <- 'xxxxxxx'
dest_dataset <- 'temp'
dest_table <- 'custs_hash'
cd <- 'CREATE_IF_NEEDED'
wd <- 'WRITE_TRUNCATE'
options(shiny.maxRequestSize = 100*1024^2)
shinyServer(function(input, output) {
logs <- eventReactive(input$go, {
inFile <- input$list
dat <- fread(inFile$datapath)
dat <- head(dat)
return(list(dat = dat))
})
upload <- eventReactive(input$go, {
data <- dat()$dat
ins <- insert_upload_job(project, dataset = dest_dataset, table = dest_table, values = data,
create_disposition = cd, write_disposition = wd)
return(list(ins = ins))
})
output$log <- renderTable(logs()$dat)
})

Answer 1

An eventReactive returns a reactive expression object. Like other reactive objects, you need to expressly call it like a function. Otherwise it won't run by itself.
So in your case, you have upload <- eventReactive(...), then you need to call it using upload().