通过API调用获取文件(R& plumber) [英] Get file through API call (R & plumber)

问题描述

我将水管工用作一些R函数的简单Web API服务.

I'm using plumber as a simple web-api service for some R functions.

我想通过R函数(类似于

I would like to provide a file 'download' (on the client side) through an R function very much like flask is doing it in python through send_file and send_from_directory.

我尝试过

#* @get /datafile
get_file <- function(){
  return(file('path-to-file.RData'))
}

但是不幸的是，它没有用(因为返回值不能转换为JSON).我知道plubmer中的静态文件服务器选项，但我真的只想提供一个单个文件而不是目录. (尽管通过@assets在目录中提供文件似乎是一个更安全的选择.)

But unfortunately it didn't work (because the return value cannot be transformed to JSON). I'm aware of static file server option in plubmer, but I really want to provide only one single file and not a directory. (Although serving files in directory through @assets seems to be a more secure option.)

推荐答案

抱歉，没有更好的记录，但是请在此处查看一些示例:

Sorry this isn't better documented, but see some examples here: https://github.com/trestletech/plumber/blob/master/tests/testthat/files/includes.R

我不记得我是否已经对二进制数据进行过测试，或者它如何处理Rdata内容类型，所以如果情况仍然很怪异请打开票证.

I don't remember if I've tested with binary data or how it will handle the Rdata content type, so if things are still weird please open a ticket.

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