Azure Function Triggers and Filters

This is part of a full day Serverless training I hosted for Microsoft Turkey in Istanbul talking about Azure Function Triggers and Function Filters.

Transcript

1. Function Triggers and Filters Daron Yöndem http://daron.me @daronyondem
2. Function Triggers and Bindings • A trigger defines how a function is invoked. • Triggers have associated data, which is usually the payload that triggered the function. • Input and output bindings provide a declarative way to connect to data from within your code.
3. High level look of what’s available More; https://goo.gl/TEyuND Type Service Trigger Input Output Timer Azure Functions ✔ HTTP Azure Functions ✔ ✔ Blob Azure Storage ✔ ✔ ✔ Events Azure Event Hubs ✔ ✔ Queues Azure Storage ✔ ✔ Tables Azure Storage ✔ ✔ No-SQL Azure Cosmos DB ✔ ✔ ✔ Push Notifications Azure Notification Hubs ✔
4. Creating our first “timer trigger” function! DEMO
8. What you can do with timer triggers? • Run at explicitly specified intervals, like every day at 2:00 am using CRON expressions, like “0 */5 * * * *“ (every 5 minutes) • Can send information to other systems, but typically don’t “return” information, only write to logs • Great for redundant cleanup and data management • Great for checking state of services • Can be combined with other functions
9. Creating our first input binding. DEMO
12. Creating our first output binding. DEMO
14. Creating an image resizer function DEMO
16. What are Function Filters? • Encapsulate common logic to be shared across many different functions • Validation, logging, error handling • Similar to ASP.NET Filters https://goo.gl/qzT1bE
17. Filter Types • Invocation Filters - have both Executing/Executed methods that are called immediately before and immediately after the target job function is invoked. • Exception Filters - Exception filters will be called for exceptions occurring at any stage in the execution pipeline.
18. Creating errorhandling and validation filters. DEMO
21. Links worth sharing Imperative bindings are available for C# • https://goo.gl/6UDoh7 Using .NET class libraries with Azure Functions • https://goo.gl/HExTPZ More on Function Filters • https://goo.gl/51ET18
22. Thanks http://daron.me | @daronyondem Download slides here; http://daron.me/decks