Cloud Collaboration with Crunch

Crunch.io provides a cloud-based data store and analytic engine. It has a web client for interactive data exploration and visualization. The crunch package for R allows analysts to interact with and manipulate Crunch datasets from within R. Importantly, this allows technical researchers to collaborate naturally with team members, managers, and clients who prefer a point-and-click interface: because all connect to the same dataset in the cloud, there is no need to email files back and forth continually to share results.

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Installing

crunch can be installed from CRAN with

The pre-release version of the package can be pulled from GitHub using the devtools package:

Getting started

Connecting to Crunch and working with datasets is simple: load the crunch package and then login().

If you use OAuth to log into the web application, you’ll need to create a Crunch password to use with the R package. To set one, load the package, call resetPassword("your.email@example.com"), and check your email for instructions. You may need to log out of your current web app session before you click the link in that email to set your Crunch password.

Once you’ve logged in, check out listDatasets() to see the names of your existing datasets, which you can load like ds <- loadDataset("The name of my dataset"). New Crunch datasets can be made from a data.frame, a .csv or .sav file, or a URL to a file with newDataset(). See the help for these functions or vignette("crunch") for more information.

Additional configuration

You can set several parameters in your .Rprofile to simplify your workflow:

  • crunch.email and crunch.pw: you can save your Crunch credentials so that you don’t have to enter them each time. I.e., you can just > login(). Please be advised of the risks of storing your password like this. See ?login for more information. Also, note that you can opt to store just your crunch.email and enter your password each time you log in–a mix of convenience and security.
  • crunch.api: if not defined, it defaults to “https://app.crunch.io/api/”, the production server. To specify a different location, either set it in your .Rprofile or after loading the crunch package, do > options(crunch.api="https://otherapi.crunch.io/api/").

If you prefer, you can set the environment variables R_CRUNCH_EMAIL, R_CRUNCH_PW, and R_CRUNCH_API.

For developers

crunch requires R version 3.0 or greater. Note that if you’re on Ubuntu, particularly older versions, you’ll need to add an alternative PPA before trying to apt-get install R. For 12.04 Precise, for example,

See https://cran.r-project.org/bin/linux/ubuntu/README for more details.

Git hooks

crunch uses a git pre-commit hook to ensure that the cube test fixtures in inst/cubes.tgz are always up to date. To enable this, you should either copy hooks/pre-commit to .git/hooks/pre-commit or sym-link the entire hooks directory with ln -s ../hooks/ .git/hooks.

Contributing

See the contribution guidelines.

Installing from a local checkout

This installs dependencies and then runs the tests, which installs crunch from your local checkout in the process. If the dependencies fail to install, check the error message. You may need to install libcurl on your system before installing the R packages.

Running tests

$ make test is all you need. Requires the httptest package for R. You can also specify a specific test file or files to run by adding a “file=” argument, like $ make test file=auth. test_package will do a regular-expression pattern match within the file names. See its documentation in the testthat package.

Testing has two options: unit tests only, and tests that communicate with an API server. This is governed by an environment variable, INTEGRATION, which is false by default, meaning that API integration tests are not run. To modify this and test against the Crunch API, you can run $ make test INTEGRATION=TRUE.

To run integration tests, you will need to specify a test user, password, and API server to communicate with, either by setting test.user, test.pw, and test.api in your .Rprofile, as in:

or by setting the environment variables R_TEST_USER, R_TEST_PW, and R_TEST_API.

If you are a Crunch developer serving a version of the API/backend with Vagrant, you will have best results if your R_TEST_API/test.api (1) is local.crunch.io, thanks to a mapping of localhost to that in your hosts file, and (2) you use http rather than https in order to avoid certificate errors. You might point at “http://local.crunch.io:8080/api/”, for example. Some tests that cannot run successfully in the Vagrant environment will be skipped when run against a local.crunch.io URL.

Updating documentation

Run $ make doc. Requires the roxygen2 package.