Alteryx hosting CRAN

[mjf]

Alteryx hosting CRAN

Installing R packages in Alteryx has been a tricky issue with many posts over the years and it fundamentally boils down to the way the install.packages() function is used; I've made a detailed post on the subject. There is a way that Alteryx can help remedy the compatibility challenge between their updates of Predictive Tools and the ever-changing landscape that is open-source development. That way is for Alteryx to host their own CRAN!

The current version of Alteryx runs R 4.1.3, which is considered an 'old release', and there are over 18,000 packages on CRAN for this version of R. By the time you read this post, there is likely a newer version of one of these packages that the package author has submitted to the R Foundation's CRAN. There is also a good chance that package isn't compatible with any Alteryx tool that uses R. What if you need that package for a macro you've downloaded? How do you get the old version, the one that is compatible? This is where Alteryx hosting CRAN comes into full fruition.

Alteryx can host their own CRAN, one that is not updated by one of many package authors throughout its history, and the packages will remain unchanged and compatible with the version of Predictive Tools that is released. All we need to do as Alteryx users is direct install.packages() to the Alteryx CRAN to get our new packages, like so,

install.packages(pkg_name, repo = "https://cran.alteryx.com")

There is a R package to create a CRAN directory, so Alteryx can get R to do the legwork for them. Here is a way of using the miniCRAN package,

library(miniCRAN)
library(tools)
path2CRAN <- "/local/path/to/CRAN"
ver <- paste(R.version$major, strsplit(R.version$minor, "\\.")[[1]][1], sep = ".") # ver = 4.1
repo <- "https://cran.r-project.org" # R Foundation's CRAN
m <- available.packages() # a matrix of all packages and their meta data from repo
pkgs4CRAN <- m[,"Package"] # character vector of all packages from repo
makeRepo(pkgs = pkgs4CRAN, path = path2CRAN, type = c("win.binary", "source"), repos = repo) # makes the local repo
write_PACKAGES(paste(path2CRAN, "bin/windows/contrib", ver, sep = "/"), type = "win.binary") # creates the PACKAGES file for package binaries
write_PACKAGES(paste(path2CRAN, "src/contrib", sep = "/"), type = "source") # creates the PACKAGES files for package sources

It will create a directory structure that replicates R Foundation's CRAN, but just for the version that Alteryx uses, 4.1/. 

Alteryx can create the CRAN, host it to somewhere meaningful (like https://cran.alteryx.com), update Predictive Tools to use the packages downloaded with the script above and then release the new version of Predictive Tools and announce the CRAN. Users like me and you just need to tell the R Tool (for example) to install from the Alteryx repo rather than any others, which may have package dependency conflicts.

This is future-proof too. Let's say Alteryx decide to release a new version of Designer and Predictive Tools based on R 4.2.2. What do they do? Download R 4.2.2, run the above script, it'll create a new directory called 4.2/, update Predictive Tools to work with R 4.2.2 and the packages in their CRAN, host the 4.2/ directory to their CRAN and then release the new version of Designer and Predictive Tools.

Simple!

[mjf]

A more elegant way to code a complete CRAN for the version of R issuing the command:

library(miniCRAN)
makeRepo(pkgs = as.character(available.packages()[,"Package"]),
         path = "/local/path/to/CRAN",
         type = c("win.binary", "source"),
         repos = "https://cran.r-project.org")

Simply change the Rversion argument in the makeRepo() command to get a complete CRAN for a different version of R, e.g. R 4.2.3:

library(miniCRAN)
makeRepo(pkgs = as.character(available.packages()[,"Package"]),
         path = "/local/path/to/CRAN",
         type = c("win.binary", "source"),
         Rversion = "4.2.3",
         repos = "https://cran.r-project.org")