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Basic Functions

Overview

Function Trigger Binding Notes
LongRunningTimer Timer -
LongRunningHttp Http -
QueueProducer Http Queue+Queue
QueueConsumer Queue -
ParamsSignaure 1 & 2 Http / Timer Queue Different way of specifying config parameters
JsonProducer Http Queue
InvoiceAPI Http - REST API for fake invoices
CustomMetrics Http - Application Insights traces and custom metrics
reCap Http - reCaptcha in Azure Functions (html output)
FoodDemo Http - Food demo
FloodTheQueue Http Queue Add many items to queue

Configuration file

Before running, add a local.settings.json file with required settings.
Example:

{
  "IsEncrypted": false,
  "Values": {
    "AzureWebJobsStorage": "UseDevelopmentStorage=true",
    "FUNCTIONS_WORKER_RUNTIME": "dotnet",
    "AzureWebJobs.LongRunningTimer.Disabled": "true",
    "AzureWebJobs.QueueConsumer.Disabled": "false",
    "azstoragedemo": "UseDevelopmentStorage=true",
    "APPINSIGHTS_INSTRUMENTATIONKEY": "xxxxxxxxx",
    "reCaptchaPrivateKey": "rrrrrrrrr"
  }
}

Misc

Graceful shutdown issues : experiments

On a running app-function, I deploy a new version from visual studio. The app restarts. This is what happens to running fucntions.

Http triggered fucntions seem to honor the cancellationn token. Timeout around 5 seconds.

2019-08-28T00:42:24.298 [Information] i=25
2019-08-28T00:42:25.330 [Information] i=26
2019-08-28T00:42:26.367 [Information] i=27
2019-08-28T00:42:27.128 [Information] Assembly reference changes detected. Restarting host...
2019-08-28T00:42:27.376 [Information] i=28
2019-08-28T00:42:27.377 [Information] *** CancellationToken ***
2019-08-28T00:42:28.384 [Information] i=29
2019-08-28T00:42:28.385 [Information] *** CancellationToken ***
2019-08-28T00:42:29.401 [Information] i=30
2019-08-28T00:42:29.401 [Information] *** CancellationToken ***
2019-08-28T00:42:30.407 [Information] i=31
2019-08-28T00:42:30.408 [Information] *** CancellationToken ***
2019-08-28T00:42:31.423 [Information] i=32
2019-08-28T00:42:31.424 [Information] *** CancellationToken ***
2019-08-28T00:43:52  No new trace in the past 1 min(s).

Timer triggered functions have a different behaviour compared to Http triggered. The shutdown process is faster and checking the token with "if (token.IsCancellationRequested)" is not working as expected. Instead, regiter to the event with: token.Register(() => { ... });

[01/06/2020 08:17:40] i=0
[01/06/2020 08:17:41] i=1
[01/06/2020 08:17:42] i=2
[01/06/2020 08:17:43] i=3
[01/06/2020 08:17:44] i=4
[01/06/2020 08:17:44] *** CancellationToken ***
[01/06/2020 08:17:45] i=5
[01/06/2020 08:17:46] i=6
[01/06/2020 08:17:47] i=7
[01/06/2020 08:17:48] i=8
[01/06/2020 08:17:49] i=9
[01/06/2020 08:17:49] Host did not shutdown within its allotted time.

On Timer triggered functions, during shutwodn, App Insight events are lost (need to be verified on http function. Perhpas the is not related to azure function itself but is cause by the way IIS kills the app-pool). Kusto query to get items from Appplication Insights.

traces 
| where timestamp > ago(100m)
| where customDimensions["InvocationId"] == "b6f2xxxxx"
| take (1000)
| order by timestamp desc

links

Azure/azure-functions-host#2153 <<<===
Azure/azure-functions-host#4251
Azure/Azure-Functions#866
Azure/Azure-Functions#862

TODO

Authentication

https://docs.microsoft.com/en-us/azure/azure-functions/functions-bindings-http-webhook#secure-an-http-endpoint-in-production

https://blogs.msdn.microsoft.com/stuartleeks/2018/02/19/azure-functions-and-app-service-authentication/ https://stackoverflow.com/questions/51413576/azure-functions-authentication

https://docs.microsoft.com/en-us/azure/app-service/overview-authentication-authorization

EasyAuth not working ???

Azure/azure-functions-host#33 Azure/azure-functions-host#3898

var xxxx = req.HttpContext.User.Identity.IsAuthenticated; //https:///.auth/me