hoard: hoardr class

Description Arguments Details Examples

View source: R/hoard_client.R

Description

hoardr class

Arguments

path

(character) a path to cache files in. required

type

(character) type of cache. One of "user_cache_dir" (default), "user_log_dir", "user_data_dir", "user_config_dir", "site_data_dir", "site_config_dir". Can also pass in any function that gives a path to a directory, e.g., tempdir(). required.

Details

For the purposes of caching, you'll likely want to stick with user_cache_dir, but you can change the type of cache with the type parameter.

hoard is just a tiny wrapper around HoardClient$new(), which isn't itself exported, but you can use it if you want via :::

Methods

cache_path_get()

Get the cache path return: (character) path to the cache directory

cache_path_set(path, type = "user_cache_dir", prefix = "R")

Set the cache path. By default, we set cache path to file.path(user_cache_dir, prefix, path). Note that this does not actually make the directory, but just sets the path to it.

  • path (character) the path to be appended to the cache path set by type

  • type (character) the type of cache, see rappdirs

  • prefix (character) prefix to the path value. Default: "R"

return: (character) path to the cache directory just set

list()

List files in the directory (full file paths) return: (character) vector of file paths for files in the cache

mkdir()

Make the directory if doesn't exist already return: TRUE, invisibly

delete(files, force = TRUE)

Delete files by name

  • files (character) vector/list of file paths

  • force (logical) force deletion? Default: TRUE

return: nothing

delete_all(force = TRUE)

Delete all files

  • force (logical) force deletion? Default: FALSE

return: nothing

details(files = NULL)

Get file details

  • files (character) vector/list of file paths

return: objects of class cache_info, each with brief summary info including file path and file size

keys(algo = "md5")

Get a hash for all files. Note that these keys may not be unique if the files are identical, leading to identical hashes return: (character) hashes for the files

key(x, algo = "md5")

Get a hash for a single file. Note that these keys may not be unique if the files are identical, leading to identical hashes

  • x (character) path to a file

  • algo (character) the algorithm to be used, passed on to digest::digest(), choices: md5 (default), sha1, crc32, sha256, sha512, xxhash32, xxhash64 and murmur32.

return: (character) hash for the file

files()

Get all files as HoardFile objects return: (character) paths to the files

compress()

Compress files into a zip file - leaving only the zip file return: (character) path to the cache directory

uncompress()

Uncompress all files and remove zip file return: (character) path to the cache directory

Examples

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(x <- hoard())
x$cache_path_set(path = "foobar", type = 'tempdir')
x
x$path
x$cache_path_get()

# make the directory if doesn't exist already
x$mkdir()

# list files in dir
x$list()
cat(1:10000L, file = file.path(x$cache_path_get(), "foo.txt"))
x$list()

# cache details
x$details()

# delete files by name - we prepend the base path for you
x$delete("foo.txt")
x$list()
x$details()

# delete all files
cat("one\ntwo\nthree", file = file.path(x$cache_path_get(), "foo.txt"))
cat("asdfasdf asd fasdf", file = file.path(x$cache_path_get(), "bar.txt"))
x$delete_all()
x$list()

# make/get a key for a file
cat(1:10000L, file = file.path(x$cache_path_get(), "foo.txt"))
x$keys()
x$key(x$list()[1])

# as files
Map(function(z) z$exists(), x$files())

# compress and uncompress
x$compress()
x$uncompress()

# reset cache path
x$cache_path_set(path = "stuffthings", type = "tempdir")
x
x$cache_path_get()
x$list()

# cleanup
unlink(x$cache_path_get())

ropensci/hoardr documentation built on Jan. 29, 2018, 8:32 a.m.