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API

How to run the API for testing

Installing AWS and SAM

  • Install the AWS CLI and configure your credentials. (We did this in class, but if needed, the process is detailed here).
  • Install the SAM CLI; instructions are available here.

How to Set up the Local Development Enviroment

  1. Download relevant repos:
git clone https://github.com/mirrulations/API.git
  • Clone the query functions in the API repo by running git submodule update --init
    • If you already have an endpoints/queries directory, delete that directory before running git submodule update --init.
    • Make sure to occasionally rerun git submodule update whenever there are changes to the query repository!
  1. Install Docker: Docker
  • allow the default Docker socket to be used (info here).
  • If you're having CORS issues when using local dev environment and the docker command in the terminal is not found:
    • Go to Docker Desktop -> settings -> advanced. Change the docker CLI install location to the other location (i.e. System -> User), click Apply & restart, then switch it back and click Apply & restart again.
    • This will remake the symlink from docker to CLI
    • We think this was caused by the fix to the docker malware issue earlier in the semester.
  1. Launch the API, navigate to the API repo and run the following commands
sam build
sam local start-api

If you make changes to template.yaml, run sam validate to check for errors and sam build to implement the changes. Take note of your api gateway link for later, you can see it in the output under “Mounting ApiFunction at {GATEWAY_URL_HERE} [GET, OPTIONS]”

How to Launch just the API

  • If any changes have been made to template.yaml, run sam validate to check for errors.
  • Make sure to install Docker
    • allow the default Docker socket to be used (info here).
    • If you're having CORS issues when using local dev environment and the docker command in the terminal is not found:
      • Go to Docker Desktop -> settings -> advanced. Change the docker CLI install location to the other location (i.e. System -> User), click Apply & restart, then switch it back and click Apply & restart again. docker settings
      • This will remake the symlink from docker to CLI
      • We think this was caused by the fix to the docker malware issue earlier in the semester.
  • To run locally, use sam build and then sam local start-api.
  • The API should be running at http://127.0.0.1:3000.

On AWS

Automated Deployment

  • Ensure the samconfig.toml file is correctly configured for automated deployments. This file contains configuration parameters that SAM CLI uses to deploy your application without manual input.
  • Run sam deploy --config-file samconfig.toml --config-env default --resolve-s3 to deploy using the default environment settings.
    • --config-file specifies the configuration file to use.
    • --config-env specifies the environment within the configuration file to use for deployment parameters.
    • SAM needs a place to put the deployment artifacts. --resolve-s3 instructs SAM CLI to automatically handle the creation or identification of an S3 bucket for storing the deployment artifacts if not already specified. This ensures that the deployment package has a place to be stored without manual setup.

Understanding samconfig.toml

The samconfig.toml file stores configuration parameters for SAM CLI deployments. Here’s what each field represents:

  • stack_name: Name of the AWS CloudFormation stack.
  • region: AWS region where the resources will be deployed.
  • confirm_changeset: Whether to prompt for confirmation before applying changes (set to false for no prompts).
  • capabilities: Permissions the SAM CLI needs to deploy resources, typically including IAM capabilities.
  • disable_rollback: Whether AWS CloudFormation should rollback changes if a deployment fails.

Endpoints and Sync

  • Run sam list endpoints --output json to get the link for the endpoint you're testing.
  • To update the API on AWS in real-time, use sam sync --watch.
    • Note: This may take a couple of minutes to start up.
    • It is ready once you see Infra sync completed.

Clean Up

  • Use sam delete when done to avoid leaving resources up, which might incur costs.

Running Tests

  • Make a python virtual environment.
  • python -m venv .venv
  • source ./.venv/bin/activate
  • pip install -r requirements.txt
  • cd to endpoints specifically and run python -m pytest ../tests/handler_test.py
  • cd to the root specifically and run `pylint --rcfile=./tests/.pylintrc $(git ls-files '*.py')
  • Here's a stackoverflow link that might help you if you get stuck.

This README has been adapted to utilize the automated deployment features of AWS SAM, making it easier and faster to manage your deployments.

For more detailed information, refer to this AWS Tutorial.