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<@ULVA73B9P> is it possible to upload a file as th...
# ask-marvin
a
@Marvin is it possible to upload a file as the input to a flow?
m
Yes, it is possible to upload a file as input to a flow in Prefect. Here's a summarized approach on how you can achieve it: 1. Upload the File to Cloud Storage: Prefect supports integration with various cloud storage providers. You can upload your file to services like AWS S3, Azure Blob Storage, or GCP Cloud Storage using Prefect's corresponding integrations. Examples: - For Google Cloud Storage:
Copy code
python
     from prefect import flow
     from prefect_gcp.cloud_storage import GcsBucket

     @flow
     def upload_to_gcs():
         path = "my_path_to/my_file.parquet"
         gcs_block = GcsBucket.load("my-gcs-bucket-block")
         gcs_block.upload_from_path(from_path=path, to_path=path)

     if __name__ == "__main__":
         upload_to_gcs()
- For AWS S3:
Copy code
python
     from prefect import flow
     from prefect_aws import S3Bucket

     @flow
     def upload_to_s3():
         path = "my_path_to/my_file.parquet"
         aws_block = S3Bucket.load("my-s3-bucket-block")
         aws_block.upload_from_path(from_path=path, to_path=path)

     if __name__ == "__main__":
         upload_to_s3()
2. Download and Use the File in a Flow: After uploading the file to cloud storage, you can download and use it in your flow as follows:
Copy code
python
   from prefect import flow, task
   from prefect_gcp.cloud_storage import GcsBucket

   @task
   def download_file():
       gcs_block = GcsBucket.load("my-gcs-bucket-block")
       gcs_block.download_to_path(from_path="my_path_to/my_file.parquet", to_path="local_path/my_file.parquet")
       with open("local_path/my_file.parquet", "rb") as f:
           file_data = f.read()
       return file_data

   @flow
   def my_flow():
       file_data = download_file()
       # Proceed with your flow logic using file_data

   if __name__ == "__main__":
       my_flow()
These examples demonstrate uploading a file to a cloud storage and then using it within a Prefect flow. Resources: - Moving Data: Prefect Docs - Creating Interactive Workflows: Prefect Docs If you need further assistance, please let me know!
a
@Marvin that's not quite the use case. I have a flow that needs lots of inputs. The best way to to that is pride them through a json file. How can i do that?
m
To provide multiple inputs to a Prefect flow through a JSON file, you can follow these steps: 1. Upload the JSON File to a Cloud Storage and Download in Flow: This involves using a Prefect integration to handle file interactions. 2. Read and Parse the JSON File: Use Python's 
json
library to read and parse the JSON file within the flow. Let's create an example to illustrate this: ### Step 1: Upload JSON File to Cloud Storage Assume you have a JSON file (
inputs.json
) that contains the flow inputs. First, upload this file to cloud storage (e.g., Google Cloud Storage). ### Step 2: Read and Parse the JSON File in the Flow Here's an example that shows how to download a JSON file from Google Cloud Storage, read it, and use its contents as inputs to a Prefect flow:
Copy code
python
import json
from prefect import flow, task
from prefect_gcp.cloud_storage import GcsBucket

@task
def download_and_read_json():
    # Load the GCS bucket block
    gcs_block = GcsBucket.load("my-gcs-bucket-block")
    
    # Download the JSON file
    gcs_block.download_to_path(from_path="path/to/inputs.json", to_path="local/path/inputs.json")
    
    # Read and parse the JSON file
    with open("local/path/inputs.json", "r") as file:
        data = json.load(file)
    
    return data

@task
def use_inputs(data):
    # Example task using the inputs
    print(f"Received inputs: {data}")

@flow
def my_flow():
    inputs = download_and_read_json()
    use_inputs(inputs)

if __name__ == "__main__":
    my_flow()
### Explanation: - 
download_and_read_json
Task: This task handles downloading the JSON file from cloud storage and parsing its content. - 
my_flow
Flow: Orchestrates the execution by first downloading the inputs and then using them in subsequent tasks. ### Resources: - Moving Data: Prefect Docs Would this approach suit your needs? If you need a specific integration or more complex handling of the JSON data, please let me know!
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