My talk about creating a real-life serverless solution, a URL minification service.

1. Creating real-life serverless
solutions with Azure Functions
@Jan_de_V
Jan de Vries
Cloud Solution Architect

2. @Jan_de_V
What is this serverless again?

3. @Jan_de_V
Servers are still here
Looks a lot like PaaS
“If your PaaS can efficiently start instances in
20ms that run for half a second, then call it
serverless.”
Adrian Cockcroft - VP Cloud Architecture Strategy AWS

4. @Jan_de_V
Hey, I know…containers!

5. @Jan_de_V
My real-life scenario!
bit.ly but cheaper!

6. @Jan_de_V
GET minified URL and redirect
CREATE minified URL

7. @Jan_de_V
Sounds like…
CQRS

8. @Jan_de_V

9. @Jan_de_V
Cosmos DB

10. @Jan_de_V

11. @Jan_de_V
Your legacy solution design

12. @Jan_de_V
A modern and super scalable design!

13. @Jan_de_V

14. @Jan_de_V

15. @Jan_de_V
Bindings & Triggers

16. @Jan_de_V
function.json
"bindings": [
{
"type": "httpTrigger",
"route": "{slug}",
"methods": [
"get"
],
"authLevel": "anonymous",
"name": "req"
}
],

17. @Jan_de_V
"bindings": [
{
"name": "minifiedUrl",
"type": "documentDB",
"databaseName": "MinifyRepository",
"collectionName": "MinifiedUrls",
"createIfNotExists": true,
"connection": "CosmosDbConnection",
"direction": "out"
}
],

18. @Jan_de_V
Don’t write JSON

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Best Practices

20. @Jan_de_V
1. One func, one thing

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2. Avoid funcs calling funcs

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3. Zero libs if possible

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4. Avoid RDBMS

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5. One func per route

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6. Async (queues)

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7. Data flows not data lakes

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8. Know how it will scale

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Paul Johnston
• https://twitter.com/PaulDJohnston
• https://medium.com/@PaulDJohnston/serverless-best-practices-
b3c97d551535
• ServerlessDays CoFounder (Jeff)
• ex AWS Serverless Senior Developer Advocate

29. @Jan_de_V
Now, start coding some Functions
Well…let’s wait a moment

30. @Jan_de_V
Where to put the code?

31. @Jan_de_V
Dependency injection?
private readonly ICosmosClient cosmosClient;
public CreateUrlHandler()
{
this.cosmosClient = new CosmosClient();
}
public CreateUrlHandler(ICosmosClient cosmosClient)
{
this.cosmosClient = cosmosClient;
}

32. @Jan_de_V
Keeping it small!

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34. @Jan_de_V
BONUS
Proxies!

35. @Jan_de_V
https://m.jdv.li/api/minifiedurl
or
https://m.jdv.li/minifiedurl

36. @Jan_de_V
proxies.json
{
"$schema": "http://json.schemastore.org/proxies",
"proxies": {
"getminifiedredirect": {
"matchCondition": {
"methods": [ "GET" ],
"route": "/{slug}"
},
"backendUri": "https://%WEBSITE_HOSTNAME%/api/{slug}"
}
}
}

37. @Jan_de_V
Questions, contact
https://github.com/Jandev/minifier
@Jan_de_V
jandv@4dotnet.nl
https://jan-v.nl

38. @Jan_de_V
Thank you!
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