Azure Functions

Azure Functions is an event driven, compute-on-demand experience that extends the existing Azure application platform with capabilities to implement code triggered by events occurring in other Azure services, SaaS products, and on-premises systems. With Azure Functions, your applications scale based on demand and you pay only for the resources you consume. Azure Functions provides an intuitive, browser-based user interface allowing you to create scheduled or triggered pieces of code implemented in a variety of programming languages.

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  1. Parse and validate "host.json" file during deployment

    I'd suggest it would be a better experience to parse the function's "host.json" file during deployment and raise an error if any configuration setting is incorrect. Currently there's no indicator of an incorrect configuration in this file.

    I've struggled with a function timing out regardless of the functionTimeout setting, and had to open a support ticket to get assistance of a support engineer to review the function's logs just to discover I've included an extra pair of double quotes. This would not show in the portal nor in the application insights service attached to the function. Instead of getting an…

    4 votes
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  2. Add option to run function app with Package URL with System Assigned Identity

    Add support to run the function app using system assigned identity with Package URL where the package exists in storage account. so instead of using SAS, it can use System Assigned identity to run the function from package URL

    4 votes
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  3. python support for durable function

    As far as I can see durable function is supported only for C#. It would be nice to have a python based azure function orchestrator.

    Or is there a way to orchestrate python based Azure function using C# durable function or is this a stupid question :P

    4 votes
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  4. UDR Support for VNET Integrated Function Apps

    Function Apps that are VNET integrated require a dedicated subnet. The Subnet that is allocated does not currently support UDR. Without the UDR Support we cant route this traffic through a fIrewall appliance for on-premise connectivity.

    4 votes
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  5. add proxy header removal option

    Would it possible to not only override/add headers, but also remove header like x-forwarded-for.

    4 votes
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  6. Provide memory usage data in context object

    It would be great if we could manage memory in realtime in our code. Please provide a method to check memory usage in the context object so that we can take mitigating steps in our code if there is not enough memory.

    4 votes
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  7. local settings json

    Add the ability to create a template local.settings.json file in the dev tooling for VSCode and Visual Studio. Since local.settings is git-ignored by default, when a developer clones down a repo they often have to re-create a local.settings.json file. To do this it involves simply creating a bare json file and hand-coding the right schema/values. It would improve developer productivity to add a "New local settings file..." option to the dev tooling which creates the same skeleton file a dev is given in a new function project.

    4 votes
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  8. Azure Function C# template to use nameof() and appropriate function name

    How about change C# template like below form?

    [FunctionName(nameof(HttpTriggerCSharp))
    public static ...HttpTriggerCSharp(...)
    {
    ...
    }

    I think all of functions name has Run() might not reasonable. and utilize nameof() could be very helpful to change function name and readibility

    4 votes
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  9. Wildcard within path of blob input bindings

    I wish we could specify blob storage input bindings path that included wildcard.

    --- function.json
    {
    "type": "blob",
    "name": "faces",
    "path": "face/profile-{date}-*.png",
    "connection": "AzureWebJobsDashboard",
    "direction": "in"
    }

    Then, I hope to process these as array of Blob objects.

    ---index.js

    module.exports = function (context, myQueueItem) {

    const fileSizeList = context.bindings.faces.map(face => face.size);
    
    context.log(fileSizeList);
    context.done();

    };

    4 votes
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  10. MQTT Subscriber trigger support as a first class trigger

    Please add support for listening to MQTT 3.0 and 3.1 servers as a subscriber for a trigger. This would be immensely useful in IoT scenarios.

    4 votes
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  11. Azure auth populate request.user

    When using the azure auth over functions, specifically those that take a http trigger, it would be great if it would populate the request.user in a similar way you can do using node.js and passport (https://github.com/Azure-Samples/active-directory-b2c-javascript-nodejs-webapi/blob/master/index.js) rather than just providing some headers.

    This would make it much easier to work with authenticated users and interact with their information

    4 votes
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  12. better error handling for EventGrid calls that you want to retry

    The Microsoft sample documentation (link below) suggests using a Run method with void return type. This doesn't allow convenient handling of errors that you want to handle by getting EventGrid to retry invoking the Azure Function again after a period. For example, my Azure Function sends a message to a server (Azure Container Instance) which may be down. In this situation I want EventGrid to invoke my Azure Function again after a period when the server might be up. However, with a void return type my only option seems to be that of throwing an exception (InvalidOperation?). Agreed, I could…

    4 votes
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  13. Add binding attribute to control function scaling

    We use azure functions extensively. One of the issues we have is not being able to control individual functions scaling. I am not talking bout the function app here, but the functions themselves.

    Using the new attribute binding system could be a very nice way to set the max number of instances a function can spawn.
    [MaxParallelExecution(5)] or something like that.

    this would make it so that particular function does not scale over 5 instances.

    4 votes
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  14. Sync code from blob storage

    I find the current deployment model way too difficult to work with. Please consider supporting auto-sync from blob storage, similar to what aws lambda offers.

    4 votes
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  15. Client cert authentication support in Azure functions

    the ability to support mutual authentication with client certs. Today the only way to do this is built it into your functions
    https://stackoverflow.com/questions/49686316/azure-functions-configure-client-certificate-authentication
    it would be great to have this as a feature of the platform.

    you could compare this lack of functionality to the something like Kubernetes ingress controller that easily allows you to do mutual auth https://github.com/kubernetes/ingress-nginx/tree/master/docs/examples/auth/client-certs

    3 votes
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  16. Reduce the price of Premium instances

    I could run a VM that costs me much less for the same configuration. To me, the price for pre-warmed instances seems too high.

    3 votes
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  17. @EventhubOutPut supporting Partitionkey

    Currently its not clear from the document whether @EventHubOutPut supports a partitionKey to write the events. There is no examples for java. Can the below document be updated ?

    https://docs.microsoft.com/en-us/azure/azure-functions/functions-bindings-event-hubs#trigger---event-metadata

    3 votes
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  18. Please consider defaulting the task hub name to the site name in Durable functions1.0 to avoid the storage conflict.

    Please consider defaulting the task hub name to the site name in Durable functions1.0 to avoid the storage conflict.

    3 votes
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    You can do this today by setting the hubName to WEBSITE_SITE_NAME in host.json. It should work in both V1 and V2 of Durable Functions. (NOTE: it should be WEBSITE_SITE_NAME surrounded in percent signs, user voice may not be displaying the percent signs properly) – Anthony

  19. Timer Trigger CRON interpreted per WEBSITE_TIME_ZONE for Linux Service Plans

    I'd like timerTrigger and WEBSITETIMEZONE app setting to work on Function Apps hosted on Linux Service Plans as described in https://docs.microsoft.com/en-us/azure/azure-functions/functions-bindings-timer#ncrontab-time-zones

    I've set WEBSITETIMEZONE app setting to "Eastern Standard Time"; however, it continues to interpret CRON expression as UTC, even after restart of Function App. I expect this works fine on Windows based Service Plans; however, this does not seem to be working on Linux based plans.

    See attached pics. CRON is "schedule": "0 30 15 * * 1-5", but triggers at 11:30am EST.

    3 votes
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  20. Add error for missing application setting

    Function apps do not show an error when you try to reference an application setting that is not there (or variable misspelled), it returns an empty string. This can lead to local testing functioning properly because the local.settings.json is complete, and then unclear breakages once published to Azure, especially if you are passing that setting on to an API that doesn't have verbose error output.

    At the very least the app should output a warning that it is returning an empty string because application setting X does not exist.

    3 votes
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