Environment variables

Demonstrates how to use environment variables within a Cloud Function.

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For detailed documentation that includes this code sample, see the following:

Code sample

C#

To authenticate to Cloud Run functions, set up Application Default Credentials. For more information, see Set up authentication for a local development environment. 

using Google.Cloud.Functions.Framework;
using Microsoft.AspNetCore.Http;
using System;
using System.Threading.Tasks;

namespace EnvironmentVariables;

public class Function : IHttpFunction
{
    public async Task HandleAsync(HttpContext context)
    {
        string foo = Environment.GetEnvironmentVariable("FOO")
            ?? "Specified environment variable is not set.";
        await context.Response.WriteAsync(foo, context.RequestAborted);
    }
}

Go

To authenticate to Cloud Run functions, set up Application Default Credentials. For more information, see Set up authentication for a local development environment. 


// Package tips contains tips for writing Cloud Functions in Go.
package tips

import (
	"fmt"
	"net/http"
	"os"
)

// EnvVar is an example of getting an environment variable in a Go function.
func EnvVar(w http.ResponseWriter, r *http.Request) {
	fmt.Fprintf(w, "FOO: %q", os.Getenv("FOO"))
}

Java

To authenticate to Cloud Run functions, set up Application Default Credentials. For more information, see Set up authentication for a local development environment. 


import com.google.cloud.functions.HttpFunction;
import com.google.cloud.functions.HttpRequest;
import com.google.cloud.functions.HttpResponse;
import java.io.BufferedWriter;
import java.io.IOException;

public class EnvVars implements HttpFunction {

  // Returns the environment variable "foo" set during function deployment.
  @Override
  public void service(HttpRequest request, HttpResponse response)
      throws IOException {
    BufferedWriter writer = response.getWriter();
    String foo = System.getenv("FOO");
    if (foo == null) {
      foo = "Specified environment variable is not set.";
    }
    writer.write(foo);
  }
}

Node.js

To authenticate to Cloud Run functions, set up Application Default Credentials. For more information, see Set up authentication for a local development environment. 

exports.envVar = (req, res) => {
  // Sends 'bar' as response
  res.send(process.env.FOO);
};

PHP

To authenticate to Cloud Run functions, set up Application Default Credentials. For more information, see Set up authentication for a local development environment. 


use Psr\Http\Message\ServerRequestInterface;

function envVar(ServerRequestInterface $request): string
{
    return getenv('FOO') . PHP_EOL;
}

Python

To authenticate to Cloud Run functions, set up Application Default Credentials. For more information, see Set up authentication for a local development environment. 

import os


def env_vars(request):
    return os.environ.get("FOO", "Specified environment variable is not set.")

Ruby

To authenticate to Cloud Run functions, set up Application Default Credentials. For more information, see Set up authentication for a local development environment. 

require "functions_framework"

FunctionsFramework.http "env_vars" do |_request|
  ENV["FOO"] || "Specified environment variable is not set."
end

What's next

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