Scaffolding for Serverless: lightning talk for AWS Arlington Meetup

Feb 28, 20182 likes526 views

Tools around a sample serverless app to automate the drudgery associated with a project. Testing with pytest and coverage; code smells with flake8; documentation with Sphinx for HTML/ePub output; different deployment environments based on code repo branch (dev, qa, prod, and per-developer); CI/CD pipeline to run all this, including deployment to separate AWS environments. And a simple app with API Gateway, Lambda, S3, DynamoDB.

A Scaffolding for Serverless Apps
Chris Shenton: CTO, V! Studios
AWS Meetup Arlington VA
2018-02-27

Drudgery, Automated
● Test framework
● Documentation
● Code smells
● Multiple stages, environments
● CI/CD
● Deployment to cloud
● Starter app
○ Lambda with Python3
○ File upload to S3
○ Metadata to DynamoDB
○ Soon: Angular2+ front-end

Testing: py.test with test coverage
(.venv3) chris@Haruspex:scaffold-serverless$ make tests
PIP INSTALLING REQUIREMENTS
.venv3/bin/pip install -r requirements.txt
================================================= test session starts
plugins: cov-2.5.1
collected 1 item
tests/test_example.py .
[100%]Coverage.py warning: No data was collected. (no-data-collected)
--------- generated xml file:
/Users/chris/Projects/vstudios/scaffold-serverless/test-results/junit/junit.xml ---------
---------- coverage: platform darwin, python 3.6.3-final-0 -----------
Name Stmts Miss Branch BrPart Cover Missing
------------------------------------------------------------
app/handler.py 55 55 16 0 0% 1-93
Coverage HTML written to dir test-results/coverage
============================================== 1 passed in 2.53 seconds

Documentation: Sphinx generates HTML, ePub
(.venv3) chris@Haruspex:scaffold-serverless$ make docs
cd docs && make SPHINXBUILD=../.venv3/bin/sphinx-build html singlehtml epub
Running Sphinx v1.6.7
reading sources... [ 20%] api
reading sources... [ 40%] cicd
reading sources... [ 60%] index
reading sources... [ 80%] stage-envs
reading sources... [100%] todo
generating indices... genindex
writing additional pages... search
copying images... [100%] cicd-dashboard.png
dumping search index in English (code: en) ... done
build succeeded.
Build finished. The HTML pages are in _build/html.
Build finished. The HTML page is in _build/singlehtml.
Build finished. The ePub file is in _build/epub.

Code Smells: Linting with Flake8
(.venv3) chris@Haruspex:scaffold-serverless$ make flake8
.venv3/bin/flake8 app/
app/handler.py:73:52: E222 multiple spaces after operator
app/handler.py:95:1: W391 blank line at end of file
make: *** [flake8] Error 1

Multiple Stages, Cloud Environments
Repo
Branch
AWS Stage
Environment
Comment
master prod conventional name for production systems
release/* qa quality assurance before release to
production
develop dev default stage name for Serverless
Framework
feature/* $CIRCLE_USERNAME each developer gets their own
environment, named after their GitHub
username

CI/CD: CircleCI every branch -- build and test, then deploy

Deployment: to multiple AWS environments

Starter App: Lambda with Python, API, DynamoDB
API Gateway
/assets
API Gateway
/upload_url
Lambda
s3upload()
Get file metadata from
S3: name, size, etag;
store to DynamoDB
Lambda
get_upload_url()
Return presigned URL
allowing upload
without credentials
Lambda
get_assets()
Return metadata as
JSON or HTML
DynamoDB
Uploads
id, size, etag, bucket
S3 Bucket
Uploads
Save file metadata
Read all metadata

Contact and Code
chris@v-studios.com
@shentonfreude
https://github.com/v-studios/scaffold-serverless

1. The document describes a CI/CD workflow that uses GitHub for code versioning, Jenkins to trigger build jobs, Sonarqube for code analysis, Ansible to execute commands, and Docker to run containers. 2. The workflow involves developers pushing code to GitHub, which triggers Jenkins to clone the code, setup databases, import configs, run tests, and deploy to servers if tests pass. 3. Ansible scripts are used to setup systems, update code, and install the project skeleton with LAMP dependencies in Docker containers.

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