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Azure Function Triggers and Filters

Daron Yondem
December 19, 2017

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.

Daron Yondem

December 19, 2017
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  1. Function Triggers
    and Filters
    Daron Yöndem
    http://daron.me
    @daronyondem

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  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.

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  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 ✔

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  4. Creating our first “timer trigger” function!
    DEMO

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  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

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  9. Creating our first input binding.
    DEMO

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  12. Creating our first output binding.
    DEMO

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  14. Creating an image resizer function
    DEMO

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  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

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  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.

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  18. Creating errorhandling and validation filters.
    DEMO

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  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

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  22. Thanks
    http://daron.me | @daronyondem
    Download slides here;
    http://daron.me/decks

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