Is there a variable for accessing the version number for a given deployed cloud function

Question

GCP displays the version number of a deployed cloud function in the console. At the moment there isn\'t a system environment variable which contains information about the de

Answer 1

There is no straightforward way to get the version number of a function at runtime. You always have the option of assigning some value yourself and put it in an environment variable using the --set-env-vars flag in gcloud.

If your goal is to figure out if a function invocation is actually running the code you just deployed while iterating during development, it's effective to simply console.log('deployed') at the global scope of your function. The message will appear in the console logs after the deployment is complete, and you can wait for that message to appear in the log in order to know when your new code is active. Everything logged after that log should be from your latest code.

Answer 2

The recently-released nodejs10 runtime environment now includes an officially documented environment variable K_REVISION that contains the deployment version of a cloud function.

From inspection, it also seems that the python37 and older nodejs8 environments include an unofficial environment variable X_GOOGLE_FUNCTION_VERSION that happens to contain the deployment version.

This snippet works on nodejs10 and unofficially works on nodejs8:

exports.helloVersion = (req, res) => {
  console.log(process.env);
  const version = process.env.K_REVISION || process.env.X_GOOGLE_FUNCTION_VERSION || "UNKNOWN";
  console.log(`Running version ${version}`);
  res.status(200).send(`Running version ${version}\n`)
};

Deploying and testing:

$ gcloud functions deploy helloVersion --runtime nodejs8 --trigger-http
versionId: '8'
$ curl https://us-central1-myproject.cloudfunctions.net/helloVersion
Running version 8

$ gcloud functions deploy helloVersion --runtime nodejs10 --trigger-http
versionId: '9'
$ curl https://us-central1-myproject.cloudfunctions.net/helloVersion
Running version 9

Of course, the K_REVISION environment variable on nodejs10 is probably the way to go, given that it's mentioned in the official documentation. The X_GOOGLE_FUNCTION_VERSION environment variable isn't officially mentioned, so it's probably a bad idea to rely on it for something important, but I've found that it might be helpful to display or include opportunistically when debugging, deploying, and testing interactively.

Answer 3

Check gcloud version, which prints out version info.