Step-by-Step Guide: Deploy DLT with Prefect Cloud on GCP

Create a new Cloud Push Worker in Google Cloud

Read the tutorial on creating a Cloud Push Worker in Google Cloud in the Prefect Docs Docs. Ensure that you install Docker as well.

Create a virtual environment for the project

 python3.10 -m venv vm_dlt_cloud_push
 cd vm_dlt_cloud_push
 source bin/activate

Install Prefect inside the virtual environment
```
 pip install -U prefect
```
Set Up the push worker with the name dlt-cloud-push

First, you will be asked about your GCP Project that should be used.

Second, you will be asked if you want to customize the resources. In this tutorial I will use the default resource names.
```
 prefect work-pool create --type cloud-run:push --provision-infra dlt-cloud-push
```

Install dlt inside the virtual environment

 pip install -U dlt
 pip install dlt[duckdb]

Follow the installation guide for DuckDB
Go to the root of your project folder and install the dlt pipeline for the project. I will use the chess pipeline with DuckDB as the destination. You can find a more detailed tutorial about the pipeline on the dlt Github page.
```
 dlt init chess duckdb
```

Add the following code to the chess_pipeline.py. It uses the prefect flow attribute to convert the pipeline run into a Prefect flow object. The main method runs the chess pipeline and deploys it to Prefect push worker defined in step 4.


 import dlt
 from prefect import flow
 from chess import source

 @flow 
 def run_chess_pipeline():
     # create dlt pipeline
     pipeline = dlt.pipeline(
         pipeline_name="chess_pipeline",
         destination="duckdb",
         dataset_name="chess_data",
     )
     # get data for a few famous players

     data = source(
         players=["MagnusCarlsen", "Hikaru", "GarryKasparov", "Vachier-Lagrave", "FabianoCaruana"],
         start_month="2022/11",
         end_month="2022/11"
     )

     load_info = pipeline.run(data)
     print(load_info)

 if __name__ == "__main__":       
     run_chess_pipeline.deploy(
         name="chess_pipeline", 
         work_pool_name="dlt-cloud-push", 
         image="<region>-docker.pkg.dev/<project>/<repository-name>/dlt-cloud-push-image:latest"
     )

Update the requirements.txt file by running the following command
```
 pip freeze > requirements.txt
```
Run the pipeline. The code should be automatically pushed to the GCP Artifact Registry. Prefect should have added a Docker container with the source code in GCP.

If you encounter a Docker error indicating that the requests library is not the newest version, try installing requests==2.31.0.
```
python chess_pipeline.py
```
Run the Prefect deployment pipeline with the following command. You should see a similar command on your terminal
```
prefect deployment run 'run-chess-pipeline/chess_pipeline'
```
Login to your Prefect Cloud account and check of the pipeline was running and the final state of the pipeline.
Note: In case you encounter a Docker error in step 10, ensure that you are not using the latest version of the requests library (e.g., version 2.32.2). Use an earlier version instead. Below is the code to uninstall/install requests and recreate the requirements.txt file:
```
pip uninstall requests
pip install requests==2.31.0
pip freeze > requirements.txt
python chess_pipeline.py
```

Step-by-Step DLT Prefect Cloud Push Deployment in Google Cloud