Streaming Script

[Lucretia]

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Your call to action should relate to your personal objectives for the live stream. Here you might ask your viewers to follow you, try out your product, or tune in to your next stream. You can also ask a trivia question, give away a prize, or offer up a special discount code to those who made it to the end of your stream.

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Hi Jitendra,

Thank you for your response. It does help to capture continuous stream. However, there is a two seconds pause between each capture. It captures the data for only a moment, then it captures the data again after about two seconds later. Is there a way to reduce this pause to milliseconds or make it go away? Two seconds is a long time for continuous stream as we are trying to get live data.

Thanks & Regards

Kia

That LUA script is for reference and to capture CW mode data in multiple blocks as Continuous Wave (CW) Mode streams the ADC data continuosly but at the capture end in the LUA script has that sequence.

AppStream 2.0 provides on-instance session scripts. You can use these scripts to run your own custom scripts when specific events occur in users' streaming sessions. For example, you can use custom scripts to prepare your AppStream 2.0 environment before your users' streaming sessions begin. You can also use custom scripts to clean up streaming instances after users complete their streaming sessions.

Session scripts are specified within an AppStream 2.0 image. These scripts are run within the user context or the system context. If your session scripts use the standard out to write information, error, or debugging messaging, these can be optionally saved to an Amazon S3 bucket within your Amazon Web Services account.

You can configure your scripts to run for a maximum of 60 seconds before your users' applications launch and their streaming sessions begin. Doing so enables you to customize the AppStream 2.0 environment before users start streaming their applications. When the session scripts run, a loading spinner displays for your users. When your scripts complete successfully or the maximum waiting time elapses, your users' streaming session will begin. If your scripts don't complete successfully, an error message displays for your users. However, your users are not prevented from using their streaming session.

If application settings persistence is enabled for your users, the application settings Virtual Hard Disk (VHD) file that stores your users' customizations and Windows settings is downloaded and mounted. Windows user login is required in this case.

Your session scripts start. If persistent storage is enabled for your users, storage connector mounting also starts. For information about persistent storage, see Enable and Administer Persistent Storage for Your AppStream 2.0 Users.

You can also configure your scripts to run after users' streaming sessions end. For example, you can run a script when users select End Session from the AppStream 2.0 toolbar, or when they reach the maximum allowed duration for the session. You can also use these session scripts to clean up your AppStream 2.0 environment before a streaming instance is terminated. For example, you can use scripts to release file locks or upload log files. When you run scripts after streaming sessions end, the following process occurs:

If application settings persistence is enabled for your users, the application settings VHD file that stores your users' customizations and Windows settings is unmounted and uploaded to an Amazon S3 bucket in your account.

In order to run the session script files, make sure that the .zip file only contains the session scripts and config.json files, and not the containing folder. For more information, see Session Scripts Configuration File.

You must have IAM permissions to perform the S3:GetObject action on the session scripts object in the Amazon S3 bucket. To learn more about storing the session scripts in an Amazon S3 bucket, see Store Application Icon, Setup Script, Session Script, and VHD in an S3 Bucket.

For Session scripts object in S3, either enter the S3 URI that represents the session scripts object, or choose Browse S3 to navigate to your S3 buckets and find the session scripts object.

To locate the session scripts configuration file in a Windows instance, navigate to C:\AppStream\SessionScripts\config.json. On a Linux instance, navigate to /opt/appstream/SessionScripts/config.json. The file is formatted as follows.

Constraints: The maximum duration is 60 seconds. If the session scripts don't complete within this duration, they will be stopped. If you require a script to continue running, launch it as a separate process.

When the value for this parameter is set to True, an S3 bucket is created within your Amazon Web Services account to store the logs created by the session script. By default, this value is set to True. For more information, see the Logging Session Script Output section later in this topic.

When this option is enabled in the configuration file, AppStream 2.0 automatically captures the output from the session script that is written to the standard out. This output is uploaded to an Amazon S3 bucket in your account. You can review the log files for troubleshooting or debugging purposes.

When AppStream 2.0 storage connectors are enabled, they begin mounting when the session start scripts run. If your script relies on the storage connectors being mounted, you can wait for the connectors to be available. AppStream 2.0 maintains the mount status of the storage connectors in the Windows registry on Windows instances, at the following key:

When you enable Amazon S3 logging in your session script configuration, AppStream 2.0 captures standard output from your session script. The output is periodically uploaded to an S3 bucket within your Amazon Web Services account. For every AWS Region, AppStream 2.0 creates a bucket in your account that is unique to your account and the Region.

You do not need to perform any configuration tasks to manage these S3 buckets. They are fully managed by the AppStream 2.0 service. The log files that are stored in each bucket are encrypted in transit using Amazon S3's SSL endpoints and at rest using Amazon S3-managed encryption keys. The buckets are named in a specific format as follows:

Your Amazon Web Services account identifier. The random ID ensures that there is no conflict with other buckets in that Region. The first part of the bucket name, appstream-logs, does not change across accounts or Regions.

For example, if you specify session scripts in an image in the US West (Oregon) Region (us-west-2) on account number 123456789012, AppStream 2.0 creates an Amazon S3 bucket within your account in that Region with the name shown. Only an administrator with sufficient permissions can delete this bucket.

Disabling session scripts does not delete any log files stored in the S3 bucket. To permanently delete log files, you or another administrator with adequate permissions must do so by using the Amazon S3 console or API. AppStream 2.0 adds a bucket policy that prevents accidental deletion of the bucket. For more information, see IAM Policies and the Amazon S3 Bucket for Application Settings Persistence in Identity and Access Management for Amazon AppStream 2.0.

On a single-session fleet, for a given instance, the SessionStart and SessionTermination hooks are guaranteed to run only one time. This is because there is a 1:1 mapping of sessions to instances. When using multi-session fleets, there is an N:M mapping of sessions to instances, where each session runs its own SessionStart and SessionTermination hook. This means that the SessionStart and SessionTermination hooks can be run many times on a given instance, and in many different orderings. For the best experience, the following should be true of your session scripts when used on multi-session fleets:

Because scripts run per session, if one session is running SessionTermination while another is running SessionStart, they should not interfere with each other, or with the experience of other sessions.

On multi-session instances, multiple sessions can be provisioned concurrently. This means that there can be multiple concurrent executions of the session scripts. Scripts should be efficient, not consume excessive resources, and not impact the experience of other users on the instance or the stability of the sessions.

AppStream 2.0 images should not be configured to allow write permission to session script files by any users. This introduces a critical attack vector for malicious users, where they could modify script files. These files could then be run as SYSTEM or another user, depending on your configuration.

It is your responsibility to make sure that your AppStream 2.0 images are configured securely. This is especially important for multi-session instances, where multiple users are using the same instance. If images are not configured securely, there is a security risk for all users of that instance.

If the service detects that a session script executable has been modified, it will fail any subsequent executions of that hook on that instance, upload log files to Amazon S3 (if Amazon S3 logging is enabled), and you will see the following message:

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