task3.md

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default	Task 3	3

Creating an Azure Function with a timer trigger

Another use case for Azure Functions is when you have a job that needs to run on a schedule. Once a week, once a month og even once every five minutes. In this task, you are to create a function that prints a summary of the ratings on the pizza site every 5 minute.

Setup trigger

1. Using the same project as previous steps: navigate to the Azure functions extension and click the "Create new function.." button

1. When prompted for configurations enter:

   Template for function: TimerTrigger

   Name: ScheduledJob

   Namespace: LearningFunctions.TimerTrigger

   Cron Expression (every 5 minute): 0 */5 * * * *

2. If prompted to create a storage account when debugging, click "use local emulator"

The timer trigger is now generated in your solution folder in "ScheduledJob.cs":

[Function("ScheduledJob")]
public static void Run([TimerTrigger("0 */5 * * * *")] MyInfo myTimer, FunctionContext context)
{
    var logger = context.GetLogger("ScheduledJob");
    logger.LogInformation($"C# Timer trigger function executed at: {DateTime.Now}");
    logger.LogInformation($"Next timer schedule at: {myTimer.ScheduleStatus.Next}");
}

Testing TimerTrigger

To test the function, run func start from cmd / terminal in the solution folder. The output should

Code to get summary from api:

[FunctionName("ScheduledJob")]
public static async Task Run([TimerTrigger("0 */5 * * * *")]TimerInfo myTimer, ILogger log)
{
    var endpoint = "https://apipizza.azurewebsites.net/ratings/ab2a204f-c5f1-424b-85e2-d8d7ac4730cc";
    var httpClient = new HttpClient();
    var result = await httpClient.GetStringAsync(endpoint + "?min=5");

    log.LogInformation($"Result: {result}");
}

(Replace {sessionCode} in the endpoint variable with your session code from https://pizzaapp.z1.web.core.windows.net/)

Modify timer function

5 minutes is a long time to wait for your function to trigger. Are you abel to modify the cron job to trigger every 5 second?