Using the new environment variable support in AWS Lambda, I've added an env var via the webui for my function.
How do I access this from Python? I tried:
import os
MY_ENV_VAR = os.environ['MY_ENV_VAR']
but my function stopped working (if I hard code the relevant value for MY_ENV_VAR it works fine).
AWS Lambda environment variables can be defined using the AWS Console, CLI, or SDKs. This is how you would define an AWS Lambda that uses an LD_LIBRARY_PATH environment variable using AWS CLI:
aws lambda create-function \
--region us-east-1
--function-name myTestFunction
--zip-file fileb://path/package.zip
--role role-arn
--environment Variables={LD_LIBRARY_PATH=/usr/bin/test/lib64}
--handler index.handler
--runtime nodejs4.3
--profile default
Once created, environment variables can be read using the support your language provides for accessing the environment, e.g. using process.env for Node.js. When using Python, you would need to import the os library, like in the following example:
...
import os
...
print("environment variable: " + os.environ['variable'])
AWS Lambda Now Supports Environment Variables
Assuming you have created the .env file along-side your settings module.
.
├── .env
└── settings.py
Add the following code to your settings.py
# settings.py
from os.path import join, dirname
from dotenv import load_dotenv
dotenv_path = join(dirname(__file__), '.env')
load_dotenv(dotenv_path)
Alternatively, you can use find_dotenv() method that will try to find a .env file by (a) guessing where to start using file or the working directory -- allowing this to work in non-file contexts such as IPython notebooks and the REPL, and then (b) walking up the directory tree looking for the specified file -- called .env by default.
from dotenv import load_dotenv, find_dotenv
load_dotenv(find_dotenv())
Now, you can access the variables either from system environment variable or loaded from .env file.
https://github.com/theskumar/python-dotenv
gepoggio answered in this post: https://github.com/serverless/serverless/issues/577#issuecomment-192781002
A workaround is to use python-dotenv: https://github.com/theskumar/python-dotenv
import os import dotenv dotenv.load_dotenv(os.path.join(here, "../.env")) dotenv.load_dotenv(os.path.join(here, "../../.env"))It tries to load it twice because when ran locally it's in project/.env and when running un Lambda the .env is located in project/component/.env
Both
import os
os.getenv('MY_ENV_VAR')
And
os.environ['MY_ENV_VAR']
are feasible solutions, just make sure in the lambda GUI that the ENV variables are actually there.
I used this code; it includes both cases, setting the variable from the handler and setting it from outside the handler.
#!/usr/bin/env python
# -*- coding: utf-8 -*-
"""Trying new lambda stuff"""
import os
import configparser
class BqEnv(object):
"""Env and self variables settings"""
def __init__(self, service_account, configfile=None):
config = self.parseconfig(configfile)
self.env = config
self.service_account = service_account
@staticmethod
def parseconfig(configfile):
"""Connection and conf parser"""
config = configparser.ConfigParser()
config.read(configfile)
env = config.get('BigQuery', 'env')
return env
def variable_tests(self):
"""Trying conf as a lambda variable"""
my_env_var = os.environ['MY_ENV_VAR']
print my_env_var
print self.env
return True
def lambda_handler(event, context):
"""Trying env variables."""
print event
configfile = os.environ['CONFIG_FILE']
print configfile
print type(str(configfile))
bqm = BqEnv('some-json.json', configfile)
bqm.variable_tests()
return True
I tried this with a demo config file that has this:
[BigQuery]
env = prod
And the setting on lambda was the following:
Hope this can help!
os.environ["variable_name"]
In the configuration section of AWS lambda, make sure you declare the variable with the same name that you're trying to access here. For this example, it should be variable_name
