go-azure-function

This is a demo project that shows how an Azure Function can be written in Go and deployed.

The Github Actions workflow contains this functionality:

• on each pull request update or push, the code is compiled, deployed to Azure and tested with Postman
• each pull request gets its own function app that is removed when the pull request is closed
• pushes to main do a production deployment (after the test job has finished successfully)

The function writes a document to Cosmos DB using an output binding.

sequenceDiagram
    participant HTTP client
    participant Functions host
    participant Function
    participant Cosmos DB
    HTTP client->>Functions host: POST with any body
    Functions host->>Function: POST with InvokeRequest JSON body
    Function-->>Functions host: Return InvokeResponse JSON body
    Functions host->>Cosmos DB: Write document
    Functions host-->>HTTP client: Return response

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Many things are probably needed before using this in production, such as:

• authentication (if needed)
• use of Application Gateway or Front Door instead of direct access to the function
• a plan for the storage account and function app that provides the desired availability and performance
• use of a deployment slot in the production job for blue-green deployment