make_request: Make a request for the Google Drive v3 API

Description

Low-level functions to execute one or more Drive API requests and, perhaps, process the response(s). Most users should, instead, use higher-level wrappers that facilitate common tasks, such as uploading or downloading Drive files. The functions here are intended for internal use and for programming around the Drive API. Three functions are documented here:

make_request() does the bare minimum: just calls an HTTP method, only adding the googledrive user agent. Typically the input is created with generate_request() or build_request() and the output is processed with process_response().
do_request() is simply process_response(make_request(x, ...)). It exists only because we had to make do_paginated_request() and it felt weird to not make the equivalent for a single request.
do_paginated_request() executes the input request with page traversal. It is impossible to separate paginated requests into a "make request" step and a "process request" step, because the token for the next page must be extracted from the content of the current page. Therefore this function does both and returns a list of processed responses, one per page.

Usage

make_request(x, ...)
do_request(x, ...)
do_paginated_request(x, ..., n_max = Inf, n = function(res) 1,
  verbose = TRUE)

Arguments

List, holding the components for an HTTP request, presumably created with generate_request() or build_request(). Should contain the method, path, query, body, token, and url.

...

Optional arguments passed through to the HTTP method.

n_max

Maximum number of items to return. Defaults to Inf, i.e. there is no limit and we keep making requests until we get all items.

Function that computes the number of items in one response or page. The default function always returns 1 and therefore treats each page as an item. If you know more about the structure of the response, you can pass another function to count and threshhold, for example, the number of files or comments.

verbose

Logical, indicating whether to print informative messages (default TRUE).

Value

make_request(): Object of class response from httr.

do_request(): List representing the content returned by a single request.

do_paginated_request(): List of lists, representing the returned content, one component per page.

Examples

Run this code

# NOT RUN {
## build a request for an endpoint that is:
##   * paginated
##   * NOT privileged in googledrive, i.e. not covered by generate_request()
## "comments" are a great example
## https://developers.google.com/drive/v3/reference/comments
##
## Practice with a target file with > 2 comments
## Note that we request 2 items (comments) per page
req <- build_request(
  path = "drive/v3/files/{fileId}/comments",
  method = "GET",
  params = list(
    fileId = "your-file-id-goes-here",
    fields = "*",
    pageSize = 2
  ),
  token = googledrive:::drive_token()
)
## make the paginated request, but cap it at 1 page
## should get back exactly two comments
do_paginated_request(req, n_max = 1)
# }

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