Create and write to a file.

Create and write to a file.

adls_open_to_raw(adls, path, offset = NULL, length = NULL)

adls_open_to_text(adls, path, encoding = "UTF-8", offset = NULL,
  length = NULL)

adls_open_to_file(adls, path, path_local, offset = NULL, length = NULL)

Arguments

adls	adls S3 object, generated using adls().
path	character, remote path, defined with respect to root-path in adls$base_url. You may find file.path() to be useful to compose the path.
offset	numeric, the position of the starting-byte.
length	numeric, the number of bytes to be processed.
encoding	character, encoding to use.
path_local	character, path on local computer.

Value

adls_open_to_raw()

A raw vector.

adls_open_to_text()

A single character string.

adls_open_to_file()

A logical indicating success of the operation.

See also

WebHDFS documentation for "Open and Read a File"

Examples

not_run({
    # create token (assumes Azure native app)
    token <- AzureOAuth::oauth_token_azure(
      tenant_id = "aaaaaaaa-bbbb-cccc-dddd-eeeeeeeeeeee",
      application_id = "ffffffff-gggg-hhhh-iiii-jjjjjjjjjjjj",
      name = "foo"
    )

    # create adls object with base-URL and token
    adls_example <- adls(
      base_url = adls_url("bar"),
      token = token
    )

    # for this example, write a temporary file
    temp_file <- tempfile(fileext = ".csv")
    write.csv(iris, file = temp_file)

    # upload file
    adls_create(
      adls_example,
      file = httr::file_upload(temp_file),
      path = "iris.csv"
    )

    # read file to a string
    adls_open_to_text(
      adls_example,
      path = "iris.csv"
    )
})