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Amazon S3 in Practice AWS Maniac live stream

In this set of assignments, we will work with several Amazon S3 APIs and features that are related to the capabilities of the Object Storage. We have just one constraint: we need to use as much Amazon S3 features as we can at once! 😉

Serverless Framework

In this assignment, to save some time and do not bother for servers and networking, we will use AWS Lambda and serverless approach. To do that, we will leverage a 3rd party tool called Serverless Framework. It allows for building the whole serverless application, including provisioning the necessary cloud resources in an automated and codified way.

We will build a Serverless Video Transcoding pipeline.

Here is the architecture of our application:

Serverless Video Transcoding

Operations

A set of useful commands.

Building Java application:

./gradlew build

Deploying serverless application:

# Deploy all functions and related AWS resources:
sls deploy

# ... or redeploying just one function:
sls deploy -f <name_of_the_function_from_serverless.yml_file>

Removing and starting from scratch:

sls remove

Using sls requires a proper setup of aws-cli that we did at the beginning. If you are using different aws-cli profile name than a default (in other words: you have set up aws-cli on your machines before the workshop) you need to set it via the following environment variables:

export AWS_DEFAULT_PROFILE=<your_profile_name>
export AWS_PROFILE=<your_profile_name>

Additionally please set a default region to the Ireland:

export AWS_DEFAULT_REGION=eu-west-1
export AWS_REGION=eu-west-1

Tasks

In the ./java/ directory look for source code. You will helpful comments and links that allow you to go step by step on your own.

Problems?

  1. If you are looking for logs, you can look inside Amazon CloudWatch service.
    • Either directly or via AWS Lambda console and selecting a function you want to inspect and heading into Monitoring tab.
    • Additionally you can do it with a sls command sls logs -f <name_of_function_from_serverless.yml_file>.
  2. Closely inspect the environment variables and numbers across the S3 buckets and other resources.

Exercise 1: S3 Event Notifications and Metadata

Description

In a first task, you need to set an S3 Event Notification correctly inside a serverless.yml file and inserting the proper name of the S3 Event.

Task

Additionally, please fill out the blanks in the Java code inside ScheduleTranscodeJob.java file related to S3 Metadata call right after scheduling an Elastic Transcoder Job.

After solving this, please deploy it, and wait until all resources are created. Then we need to manually click through the creation process of Amazon Elastic Transcoder pipeline (it does not support AWS CloudFormation), and after obtaining the pipeline ID, we enter it to the serverless.yml file. Now we are ready to deploy again and test.

Result

After that step, you should successfully schedule jobs in the Elastic Transcoder pipeline after uploading a video file. You can find sample files in the samples directory. When a job is scheduled, a newly uploaded file should also have an S3 metadata entry with the returned Job ID.

Exercise 2: S3 API

Description

First function schedules transcoding, which lands in the same bucket, but in a different directory. As we not only request for the new video formats but also we are generating thumbnails - we need to list all created files into a CSV file. When Elastic Transcoder finishes the transcoding sends a notification via SNS topic - and that is triggering lambda function that is affected by the task no. 2.

Task

Please fill out the blanks annotated as 2nd task, which are related to the usage of S3 API.

Result

When scheduled job from previous step finishes, you should see a CSV file with the complete list of files produced from the transcoding job. It will be placed inside the same bucket. Still, a different directory (configured via environment variables), inspect that file and make sure that it contains proper columns, where one is a key name (filename).

Exercise 3: S3 Select and S3 Batch Operations

Description

Now it's a time to clean up those files and move it to a different bucket. We will use S3 Batch Operations API for that. To complete this, we need to create a manifest file, and that is why we needed the CSV from a previous step.

Task

Your task here is to fill out the blanks related with S3 Select call to the CSV file and selecting only the proper column, plus completing the S3 Batch Operation job definition based on the collected information.

Result

As a result of your, lambda should be invoked when a new CSV file lands in a proper directory. Right after that, you should see a new S3 Batch Operation job to be scheduled, which eventually copies the necessary files to the separate bucket, configured with the use of environment variables.

License

Authors