google cloud functions default environment variables not set

Question

Are there any conditions to the default environment variables being set on google cloud function?

I have the following code:

func init() {
    projectID := os.Getenv("GCP_PROJECT")
    log.Printf("projectID: %s\n", projectID)

    functionName := os.Getenv("FUNCTION_NAME")
    log.Printf("functoinName: %s\n", functionName)

    region := os.Getenv("FUNCTION_REGION")
    log.Printf("region: %s\n", region)
}

and the values are empty.

Even if I do:

func GameUpdate(ctx context.Context, e FirestoreEvent) error {
    functionName := os.Getenv("FUNCTION_NAME")
    log.Printf("functoinName: %s\n", functionName)
}

They are still empty.

According to documentation, I would expect them to be set and available. But they are not :|

EDIT:

I am using go 1.13 as runtime and as Armatorix mentioned, these env variables are not available in that runtime...

Why I needed them was to write a wrapper for cloud.google.com/go/logging to be able to tag the severity of the logs.

I ended up prepending my stdout logs with [INFO]/[ERROR], and creating a tag from it \[([A-Z]+)\].*. Bonus is that I don't have to do a network call in my function to ship the logs.

Still disappointing that these environment variables are not available.

Answer 1

So I've read the same documentation. Here you've got the info that it works like this with go1.11 (And it works, I tested it out). BUT for go1.13 these are not set. You can still do it manually. Also I've checked which envs are set on 1.13 version.

From os.Envrion()

PATH=/layers/google.go.build/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin
FUNCTION_SIGNATURE_TYPE=http
DEBIAN_FRONTEND=noninteractive
HOME=/root
K_REVISION=9
FUNCTION_TARGET=HelloWorld
PORT=8080
GOROOT=/usr/local/go/
CGO_ENABLED=1
PWD=/srv
K_SERVICE=function-1

So the env that you probably want to use is K_SERVICE