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hoardr class

Source: R/hoard_client.R
hoard.Rd

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 = NULL, type = "user_cache_dir", prefix = "R", full_path = NULL)

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"

  • full_path (character) instead of using path, type, and prefix just set the full path with this parameter

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

exists(files)

Check if files exist

  • files: (character) one or more files, paths are optional

return: (data.frame) with two columns:

  • files: (character) file path

  • exists: (boolean) does it exist or not

Examples

(x <- hoard())
#> <hoard> 
#>   path: 
#>   cache path: 
x$cache_path_set(path = "foobar", type = 'tempdir')
#> [1] "/tmp/Rtmp64kN4b/R/foobar"
x
#> <hoard> 
#>   path: foobar
#>   cache path: /tmp/Rtmp64kN4b/R/foobar
x$path
#> [1] "foobar"
x$cache_path_get()
#> [1] "/tmp/Rtmp64kN4b/R/foobar"

# Or you can set the full path directly with `full_path`
mydir <- file.path(tempdir(), "foobar")
x$cache_path_set(full_path = mydir)
#> [1] "/tmp/Rtmp64kN4b/foobar"
x
#> <hoard> 
#>   path: foobar
#>   cache path: /tmp/Rtmp64kN4b/foobar
x$path
#> [1] "foobar"
x$cache_path_get()
#> [1] "/tmp/Rtmp64kN4b/foobar"

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

# list files in dir
x$list()
#> character(0)
cat(1:10000L, file = file.path(x$cache_path_get(), "foo.txt"))
x$list()
#> [1] "/tmp/Rtmp64kN4b/foobar/foo.txt"

# add more files
cat(letters, file = file.path(x$cache_path_get(), "foo2.txt"))
cat(LETTERS, file = file.path(x$cache_path_get(), "foo3.txt"))

# see if files exist
x$exists("foo.txt") # exists
#>                            files exists
#> 1 /tmp/Rtmp64kN4b/foobar/foo.txt   TRUE
x$exists(c("foo.txt", "foo3.txt")) # both exist
#>                             files exists
#> 1  /tmp/Rtmp64kN4b/foobar/foo.txt   TRUE
#> 2 /tmp/Rtmp64kN4b/foobar/foo3.txt   TRUE
x$exists(c("foo.txt", "foo3.txt", "stuff.txt")) # one doesn't exist
#>                              files exists
#> 1   /tmp/Rtmp64kN4b/foobar/foo.txt   TRUE
#> 2  /tmp/Rtmp64kN4b/foobar/foo3.txt   TRUE
#> 3 /tmp/Rtmp64kN4b/foobar/stuff.txt  FALSE

# cache details
x$details()
#> <cached files>
#>   directory: /tmp/Rtmp64kN4b/foobar
#> 
#>   file: /foo.txt
#>   size: 0.049 mb
#> 
#>   file: /foo2.txt
#>   size: 0 mb
#> 
#>   file: /foo3.txt
#>   size: 0 mb
#> 

# delete files by name - we prepend the base path for you
x$delete("foo.txt")
x$list()
#> [1] "/tmp/Rtmp64kN4b/foobar/foo2.txt" "/tmp/Rtmp64kN4b/foobar/foo3.txt"
x$details()
#> <cached files>
#>   directory: /tmp/Rtmp64kN4b/foobar
#> 
#>   file: /foo2.txt
#>   size: 0 mb
#> 
#>   file: /foo3.txt
#>   size: 0 mb
#> 

# 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()
#> character(0)

# make/get a key for a file
cat(1:10000L, file = file.path(x$cache_path_get(), "foo.txt"))
x$keys()
#> [1] "fe28308b4b9c4b40998cf4d5927a15ed"
x$key(x$list()[1])
#> [1] "fe28308b4b9c4b40998cf4d5927a15ed"

# as files
Map(function(z) z$exists(), x$files())
#> [[1]]
#> [1] TRUE
#> 

# compress and uncompress
x$compress()
#> compressed!
x$uncompress()
#> uncompressed!

# reset cache path
x$cache_path_set(path = "stuffthings", type = "tempdir")
#> [1] "/tmp/Rtmp64kN4b/R/stuffthings"
x
#> <hoard> 
#>   path: stuffthings
#>   cache path: /tmp/Rtmp64kN4b/R/stuffthings
x$cache_path_get()
#> [1] "/tmp/Rtmp64kN4b/R/stuffthings"
x$list()
#> character(0)

# cleanup
unlink(x$cache_path_get())