{"id":15657,"date":"2020-08-07T07:15:19","date_gmt":"2020-08-07T07:15:19","guid":{"rendered":"https:\/\/www.testpreptraining.com\/tutorial\/?page_id=15657"},"modified":"2023-04-12T09:12:07","modified_gmt":"2023-04-12T09:12:07","slug":"create-a-function-thats-triggered-by-blob-storage","status":"publish","type":"page","link":"https:\/\/www.testpreptraining.ai\/tutorial\/create-a-function-thats-triggered-by-blob-storage\/","title":{"rendered":"Create a function that’s triggered by Blob storage"},"content":{"rendered":"\n

This tutorial will help you in Creating a function that’s triggered by Blob storage. You will Learn how to create a function triggered when files are uploaded to or updated in a Blob storage container.<\/p>\n\n\n\n

Creating a function that’s triggered by Blob storage<\/strong><\/h2>\n\n\n\n
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  1. Log in to the Azure portal (https:\/\/portal.azure.com<\/a>).<\/li>\n\n\n\n
  2. Click “Create a resource” in the left-hand navigation bar and select “Function App”.<\/li>\n\n\n\n
  3. In the “Function App” blade, provide a unique name for your Function App and choose a subscription, resource group, and hosting plan. You can also configure the storage account settings and choose a runtime stack.<\/li>\n\n\n\n
  4. Click “Create” to create the Function App.<\/li>\n\n\n\n
  5. Once the Function App is created, click on the “Functions” blade and select “New Function”.<\/li>\n\n\n\n
  6. Choose “Azure Blob Storage trigger” as the function template and provide a name for your function. You can also choose to create a new storage account or use an existing one.<\/li>\n\n\n\n
  7. In the “Azure Blob Storage trigger” configuration window, specify the Blob storage container you want to monitor and select the trigger type. You can choose to trigger the function when a blob is added, modified or deleted. You can also specify a filter to only trigger the function for specific file types or file names.<\/li>\n\n\n\n
  8. Click “Create” to create the function.<\/li>\n\n\n\n
  9. In the function editor window, write the code that will be executed when the function is triggered by a Blob storage event. You can use the input binding to read the contents of the Blob and perform any necessary processing, such as data transformation, parsing or validation.<\/li>\n\n\n\n
  10. Save your function code and click “Run” to test it with a sample Blob. You can also use the “Test\/Run” tab to specify input and output bindings and test your function with real-world data.<\/li>\n\n\n\n
  11. Once you’re satisfied with your function, you can deploy it to your Function App by clicking “Deploy” in the upper-right corner of the editor window. You can also configure the function settings, such as environment variables, application settings, and access controls.<\/li>\n\n\n\n
  12. To monitor your function and view its logs, go to the “Monitor” tab and select “Logs”. You can use the log data to diagnose issues and optimize the performance of your function.<\/li>\n<\/ol>\n\n\n\n

    Creating an Azure Function app<\/strong><\/h3>\n\n\n\n

    Firstly, Go to Azure portal menu or the Home<\/strong> page, choose Create a resource<\/strong>.<\/p>\n\n\n\n

    Now, In the New<\/strong> page, choose Compute<\/strong> > Function App<\/strong>.<\/p>\n\n\n\n

    Also, On the Basics<\/strong> page, you use the function app settings as specified in the following table.<\/p>\n\n\n\n

    Setting<\/th>Suggested value<\/th>Description<\/th><\/tr><\/thead>
    Subscription<\/strong><\/td>Your subscription<\/td>The subscription under which this new function app is created.<\/td><\/tr>
    Resource Group<\/strong><\/td>myResourceGroup<\/em><\/td>Name for the new resource group in which to create your function app.<\/td><\/tr>
    Function App name<\/strong><\/td>Globally unique name<\/td>Name that identifies your new function app. Valid characters are a-z<\/code> (case insensitive), 0-9<\/code>, and -<\/code>.<\/td><\/tr>
    Publish<\/strong><\/td>Code<\/td>Option to publish code files or a Docker container.<\/td><\/tr>
    Runtime stack<\/strong><\/td>Preferred language<\/td>Choose a runtime that supports your favorite function programming language. Choose .NET Core<\/strong> for C# and F# functions.<\/td><\/tr>
    Version<\/strong><\/td>Version number<\/td>Choose the version of your installed runtime.<\/td><\/tr>
    Region<\/strong><\/td>Preferred region<\/td>Choose a region near you or near other services your functions access.<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n
    \n
    \"Basics\"\/
    Image source – Microsoft <\/figcaption><\/figure>\n<\/div>\n\n\n

    Further steps<\/strong><\/h4>\n\n\n\n

    choose Next : Hosting<\/strong>. Fill in the following information on the Hosting page.<\/p>\n\n\n\n

    Setting<\/th>Suggested value<\/th>Description<\/th><\/tr><\/thead>
    Storage account<\/strong><\/td>Globally unique name<\/td>Create a storage account used by your function app. Storage account names must be between 3 and 24 characters in length and can contain numbers and lowercase letters only. You can also use an existing account, which must meet the storage account requirements.<\/td><\/tr>
    Operating system<\/strong><\/td>Preferred operating system<\/td>An operating system is pre-selected for you based on your runtime stack selection, but you can change the setting if necessary.<\/td><\/tr>
    Plan<\/strong><\/td>Consumption (Serverless)<\/strong><\/td>Hosting plan that defines how resources are allocated to your function app. In the default Consumption<\/strong> plan, resources are added dynamically as required by your functions. In this serverless hosting, you pay only for the time your functions run. When you run in an App Service plan, you must manage the scaling of your function app.<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n
    \n
    \"Hosting\"\/
    Image source – Microsoft<\/figcaption><\/figure>\n<\/div>\n\n\n

    choose Next : Monitoring<\/strong>. On the Monitoring<\/strong> page, enter the following settings.<\/p>\n\n\n\n

    Setting<\/th>Suggested value<\/th>Description<\/th><\/tr><\/thead>
    Application Insights<\/strong><\/td>Default<\/td>Creates an Application Insights resource of the same App name<\/em> in the nearest supported region. By expanding this setting or selecting Create new<\/strong>, you can change the Application Insights name or choose a different region in an Azure geography where you want to store your data.<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n
    \n
    \"Monitoring\"\/
    Image source – Microsoft<\/figcaption><\/figure>\n<\/div>\n\n\n

    On the Review + create<\/strong> page, go through your settings, and then choose Create<\/strong> to provision and deploy the function app.<\/p>\n\n\n\n

    choose the Notifications<\/strong> icon in the upper-right corner of the portal and watch for the Deployment succeeded<\/strong> message.<\/p>\n\n\n\n

    To see your new function app, select Go to the resource. You may also choose to pin it to your dashboard. It’s easy to return to this function app resource from your dashboard if you pin it.<\/p>\n\n\n\n

    You’ve successfully created your new function app.<\/p>\n\n\n\n

    Create the container<\/strong><\/h3>\n\n\n\n
      \n
    1. In your function, on the Overview<\/strong> page, choose your resource group.<\/li>\n<\/ol>\n\n\n
      \n
      \"Select
      Image source – Microsoft<\/figcaption><\/figure>\n<\/div>\n\n\n

      Find and choose your resource group’s storage account.<\/p>\n\n\n

      \n
      \"Access
      Image source – Microsoft<\/figcaption><\/figure>\n<\/div>\n\n\n

      Select Containers<\/strong>, and then select + Container<\/strong>.<\/p>\n\n\n

      \n
      \"Add
      Image source – Microsoft<\/figcaption><\/figure>\n<\/div>\n\n\n

      In the Name<\/strong> field, type samples-workitems<\/code>, and then choose Create<\/strong>.<\/p>\n\n\n

      \n
      \"Name
      Image source – Microsoft<\/figcaption><\/figure>\n<\/div>\n\n\n

      Now that you have a blob container, you can test the function by uploading a file to the container.<\/p>\n\n\n\n

      Create an Azure Blob storage triggered function<\/strong><\/h3>\n\n\n\n