@Marvin How can I use Jinja to pass a value from raw data sent to a webhook to a deployment parameter via automation?

To pass a value from raw data sent to a webhook to a deployment parameter using Jinja in Prefect, you can follow these steps: 1. Webhook Setup: Ensure your webhook is configured to receive POST requests with the required data. The body of the request can include fields like

model

and

friendly_name

. 2. Using Jinja for Templating: Use Jinja2 templates to extract values from the incoming webhook data. You can access the body of the request using

{{ body.<field_name> }}

. For example, to handle missing values, you can use Jinja2's

default

filter:

{{ body.friendly_name|default(body.model) }}

. 3. Deployment Configuration: In your

prefect.yaml

file, you can templatize deployment steps by referencing variables. For example, you can define variables in the YAML file to be evaluated at runtime. 4. Security: If you're using Prefect Cloud Pro or Enterprise, consider associating a service account with your webhook for additional security. Include the API key in the

Authorization

header of your webhook requests. For more details, refer to the Prefect documentation on webhook triggers and variables in deployments. If you have specific requirements or need further assistance, feel free to ask.

@Marvin The raw data looks like this:

{
  "payload": {
    "body": {
      "Name": "50340019619.txt",
    }
  }
}

I want the value

50340019619.txt

Given the structure of your JSON data, you can extract the value

"50340019619.txt"

using Jinja by accessing the nested fields. Here's how you can do it: 1. Accessing Nested JSON Fields: Use the following Jinja expression to extract the

Name

value from your JSON structure:

jinja
   {{ body.payload.body.Name }}

2. Using in Deployment: If you want to use this extracted value as a parameter in a deployment, ensure your

prefect.yaml

file is set up to accept it. For example:

yaml
   parameters:
     file_name: "{{ body.payload.body.Name }}"

3. Webhook Configuration: Make sure your webhook is configured to parse this JSON data correctly so that the Jinja template can evaluate the expression and extract the desired value. This setup will allow you to dynamically pass the

Name

value from the webhook's JSON payload to your deployment parameters. If you need further assistance, feel free to ask!

@Marvin This isn't working as expected. I've added the parameter to the deployment and added the same

"{{ body.payload.body.Name }}"

to the

file_name

parameter in the automation. The deployment fails because the

file_name

parameter =

""

.

It seems like the issue might be related to how the JSON body is being parsed or accessed. Let's ensure the Jinja template is correctly accessing the JSON structure. Here are a few things to verify and try: 1. Correct JSON Access: Make sure the JSON structure is being correctly parsed. The correct Jinja expression based on your provided JSON should be:

jinja
   {{ payload.body.Name }}

2. Webhook Configuration: Ensure that the webhook is correctly configured to pass the JSON data to the automation. The webhook should be set to handle POST requests with the body containing your JSON structure. 3. Debugging: You might want to add some logging or debugging steps to verify what the incoming JSON looks like. This can help confirm whether the JSON is being received as expected. 4. Default Values: If there's a chance the

Name

field might not be present, consider using a default filter in Jinja:

jinja
   {{ payload.body.Name|default('default_value') }}

5. Prefect Automation Setup: Double-check that the automation is correctly set up to pass the parsed values to the deployment parameters. Ensure that the parameter names in your

prefect.yaml

match those being set by the automation. If these steps don't resolve the issue, you might want to check the Prefect logs or webhook logs for any errors or discrepancies in the JSON data being processed. If you have more specific logs or error messages, feel free to share them for further assistance.

@Marvin Could the template of my webhook be the problem?

{
    "event": "amazon.sales.file.added",
    "payload": {{ body|tojson }}
}

Yes, the template of your webhook could indeed be the issue. The way you are currently using Jinja to convert the

body

to JSON might not be correctly aligning with how you are attempting to access it later. Here's a breakdown of what might be happening and how you can adjust: 1. Current Template:

jinja
   {
       "event": "amazon.sales.file.added",
       "payload": {{ body|tojson }}
   }

This template is converting the entire

body

to JSON and assigning it to the

payload

field. 2. Accessing Nested Data: If you want to access nested fields within

payload

, ensure that you are accessing them properly in your Jinja template or wherever you are using this JSON. 3. Corrected Access: When you are trying to extract

Name

from this structure, ensure you are accessing it correctly:

jinja
   {{ payload.body.Name }}

4. Template Adjustment: If you need to adjust the JSON structure to make it easier to access, you can modify the template to directly include the nested fields:

jinja
   {
       "event": "amazon.sales.file.added",
       "payload": {
           "body": {
               "Name": "{{ body.Name }}"
           }
       }
   }

5. Verification: Double-check that the JSON structure being sent to the automation matches what you expect. You can log or print the JSON to verify its structure. By ensuring the JSON structure is correct and that you are accessing it properly, you should be able to pass the

Name

value successfully as a deployment parameter. If the issue persists, consider adding more logging to inspect the JSON at various stages of processing.