Building serverless-applications
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The document discusses building serverless applications with Python, highlighting technologies like AWS Lambda and the Chalice micro framework for creating APIs. It includes code examples for deploying functions and interacting with a simple book API. The author also addresses future challenges in tooling and deployment within serverless architectures.
![Your first λ function
def lambda_handler(event, context):
message = 'Hello {}!'.format(event['name'])
return {'message': message}
@a_soldatenko](https://image.slidesharecdn.com/building-serverless-applications-170730104051/85/Building-serverless-applications-14-320.jpg)
![Chalice python
micro framework
$ cat app.py
from chalice import Chalice
app = Chalice(app_name='hellopyconit')
@app.route('/books', methods=['GET'])
def get_books():
return {'hello': 'from python library'}
...
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https://github.com/awslabs/chalice](https://image.slidesharecdn.com/building-serverless-applications-170730104051/85/Building-serverless-applications-19-320.jpg)
![...
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@app.route('/books/{book_id}', methods=['POST', 'PUT', 'DELETE'])
def process_book(book_id):
request = app.current_request
if request.method == 'PUT':
return {'msg': 'Book {} changed'.format(book_id)}
elif request.method == 'DELETE':
return {'msg': 'Book {} deleted'.format(book_id)}
elif request.method == 'POST':
return {'msg': 'Book {} created'.format(book_id)}
Chalice python
micro framework
@a_soldatenko](https://image.slidesharecdn.com/building-serverless-applications-170730104051/85/Building-serverless-applications-20-320.jpg)
Building serverless-applications
- 1. Building Serverless applications with Python Andrii Soldatenko 8 April 2017 Italy, Otto @a_soldatenko
- 2. Andrii Soldatenko • Senior Python Developer at • CTO at • Co-organizer PyCon Belarus 2017 • Speaker at many PyCons and open source contributor • blogger at https://asoldatenko.com @a_soldatenko
- 3. …in the next few years we’re going to see the first billion-dollar startup with a single employee, the founder, and that engineer will be using serverless technology. @a_soldatenko James Governor Analyst & Co-founder at RedMonk
- 6. Travis CI
- 8. Later in 2014… Amazon introduce AWS Lambda https://techcrunch.com/2015/11/24/aws-lamda-makes- serverless-applications-a-reality/
- 9. What about conferences? http://serverlessconf.io/
- 11. λ @a_soldatenko
- 13. How Lambda works - function name; - memory size - timeout; - role; @a_soldatenko
- 14. Your first λ function def lambda_handler(event, context): message = 'Hello {}!'.format(event['name']) return {'message': message} @a_soldatenko
- 15. Deploy λ function #!/usr/bin/env bash python -m zipfile -c hello_python.zip hello_python.py aws lambda create-function --region us-west-2 --function-name HelloPython --zip-file fileb://hello_python.zip --role arn:aws:iam::278117350010:role/lambda-s3- execution-role --handler hello_python.my_handler --runtime python2.7 --timeout 15 --memory-size 512 @a_soldatenko
- 16. Invoke λ function aws lambda invoke --function-name HelloPython --payload '{"name":"PyCon Italy"}' output.txt cat output.txt {"message": "Hello PyCon Italy!"}% @a_soldatenko
- 17. Amazon API Gateway Resource HTTP verb AWS Lambda /books GET get_books /book POST create_book /books/{ID} PUT chage_book /books/{ID} DELETE delete_book
- 19. Chalice python micro framework $ cat app.py from chalice import Chalice app = Chalice(app_name='hellopyconit') @app.route('/books', methods=['GET']) def get_books(): return {'hello': 'from python library'} ... ... ... https://github.com/awslabs/chalice
- 20. ... ... ... @app.route('/books/{book_id}', methods=['POST', 'PUT', 'DELETE']) def process_book(book_id): request = app.current_request if request.method == 'PUT': return {'msg': 'Book {} changed'.format(book_id)} elif request.method == 'DELETE': return {'msg': 'Book {} deleted'.format(book_id)} elif request.method == 'POST': return {'msg': 'Book {} created'.format(book_id)} Chalice python micro framework @a_soldatenko
- 21. Chalice deploy chalice deploy Updating IAM policy. Updating lambda function... Regen deployment package... Sending changes to lambda. API Gateway rest API already found. Deploying to: dev https://8rxbsnge8d.execute-api.us- west-2.amazonaws.com/dev/ @a_soldatenko
- 22. Try our books API curl -XGET https://8rxbsnge8d.execute- api.us-west-2.amazonaws.com/dev/books {"hello": "from python library"}% curl -XGET https://8rxbsnge8d.execute- api.us-west-2.amazonaws.com/dev/books/15 {"message": "Book 15"}% curl -XDELETE https://8rxbsnge8d.execute- api.us-west-2.amazonaws.com/dev/books/15 {"message": "Book 15 has been deleted"}% @a_soldatenko
- 23. Chalice under the hood @a_soldatenko - botocore; - typing;
- 24. Chalice under the hood @a_soldatenko
- 28. AWS Lambda without any costs @a_soldatenko - The first 400,000 seconds of execution time with 1 GB of memory
- 29. What if you want to run your Django app? @a_soldatenko
- 30. @a_soldatenko
- 31. @a_soldatenko
- 32. @a_soldatenko And again what do you mean “serveless”?
- 33. @a_soldatenko ➜ pip install zappa ➜ zappa init ███████╗ █████╗ ██████╗ ██████╗ █████╗ ╚══███╔╝██╔══██╗██╔══██╗██╔══██╗██╔══██╗ ███╔╝ ███████║██████╔╝██████╔╝███████║ ███╔╝ ██╔══██║██╔═══╝ ██╔═══╝ ██╔══██║ ███████╗██║ ██║██║ ██║ ██║ ██║ ╚══════╝╚═╝ ╚═╝╚═╝ ╚═╝ ╚═╝ ╚═╝ Welcome to Zappa! ... ➜ zappa deploy https://github.com/Miserlou/Zappa
- 34. @a_soldatenkohttps://github.com/Miserlou/Zappa - deploy; - tailing logs; - run django manage.py … ███████╗ █████╗ ██████╗ ██████╗ █████╗ ╚══███╔╝██╔══██╗██╔══██╗██╔══██╗██╔══██╗ ███╔╝ ███████║██████╔╝██████╔╝███████║ ███╔╝ ██╔══██║██╔═══╝ ██╔═══╝ ██╔══██║ ███████╗██║ ██║██║ ██║ ██║ ██║ ╚══════╝╚═╝ ╚═╝╚═╝ ╚═╝ ╚═╝ ╚═╝
- 37. Python 2.7 will retire in... @a_soldatenkohttps://pythonclock.org/
- 38. AWS lambda and Python 3 @a_soldatenko import os def lambda_handler(event, context): txt = open('/etc/issue') print txt.read() return {'message': txt.read()} Amazon Linux AMI release 2016.03 Kernel r on an m
- 39. AWS lambda and Python 3 @a_soldatenko Linux ip-10-11-15-179 4.4.51-40.60.amzn1.x86_64 #1 SMP Wed Mar 29 19:17:24 UTC 2017 x86_64 x86_64 x86_64 GNU/ Linux import subprocess def lambda_handler(event, context): args = ('uname', '-a') popen = subprocess.Popen(args, stdout=subprocess.PIPE) popen.wait() output = popen.stdout.read() print(output)
- 40. AWS lambda and Python 3 @a_soldatenko import subprocess def lambda_handler(event, context): args = ('which', 'python3') popen = subprocess.Popen(args, stdout=subprocess.PIPE) popen.wait() output = popen.stdout.read() print(output) python3: /usr/bin/python3 /usr/bin/python3.4m /usr/bin/ python3.4 /usr/lib/python3.4 /usr/lib64/python3.4 /usr/local/lib/ python3.4 /usr/include/python3.4m /usr/share/man/man1/ python3.1.gz YAHOOO!!:
- 41. Run python 3 from python 2 @a_soldatenko
- 42. Prepare Python 3 for AWS Lambda @a_soldatenko virtualenv venv -p `which python3.4` pip install requests zip -r lambda_python3.zip venv python3_program.py lambda.py
- 43. Run python 3 from python 2 @a_soldatenko cat lambda.py import subprocess def lambda_handler(event, context): args = ('venv/bin/python3.4', 'python3_program.py') popen = subprocess.Popen(args, stdout=subprocess.PIPE) popen.wait() output = popen.stdout.read() print(output)
- 44. Run python 3 from python 2 @a_soldatenko START RequestId: 44c89efb-1bd2-11e7-bf8c-83d444ed46f1 Version: $LATEST Python 3.4.0 END RequestId: 44c89efb-1bd2-11e7-bf8c-83d444ed46f1 REPORT RequestId: 44c89efb-1bd2-11e7-bf8c-83d444ed46f1
- 45. Thanks Lyndon Swan for ideas about hacking python 3 @a_soldatenko
- 46. Future of serverless @a_soldatenko The biggest problem with Serverless FaaS right now is tooling. Deployment / application bundling, configuration, monitoring / logging, and debugging all need serious work. https://github.com/awslabs/serverless- application-model/blob/master/HOWTO.md