HeaderCursorPaginator Does Not Work

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Introduction

As a user of the Data Lineage Tool (DLT), you may have encountered issues with the HeaderCursorPaginator not working as expected. This article aims to provide a detailed explanation of the problem, its expected behavior, and the steps to reproduce the issue. We will also cover the necessary configuration changes to resolve the problem.

Problem Description

The HeaderCursorPaginator is a paginator type provided by DLT, which allows users to paginate data using the NextPageToken header. However, when trying to use this paginator, users may encounter issues where it does not work as expected. The problem lies in the missing mapping for this paginator type in the PAGINATOR_MAP configuration.

Expected Behavior

The expected behavior of the HeaderCursorPaginator is to work seamlessly with the NextPageToken header, allowing users to paginate data correctly. This means that when the paginator is used, it should automatically fetch the next page of data using the NextPageToken header, without any issues.

Steps to Reproduce

To reproduce the issue, follow these steps:

Step 1: Install DLT and Required Libraries

First, install DLT and the required libraries using pip:

pip install dlt

Step 2: Create a DLT Source

Create a DLT source using the rest_api_source function, specifying the HeaderCursorPaginator type and the NextPageToken cursor key:

import os
import dlt
from dlt.sources.rest_api import rest_api_source, RESTAPIConfig
access_token = "XXX"

source = rest_api_source({

     "client": {
        "base_url": "https://www.wrike.com/api/v4/",
        "auth": {
            "token": access_token,
        },
        "paginator": {
            "type": "HeaderCursorPaginator",
            "cursor_key": "NextPageToken",
        },
    },

    "resources": [

        "tasks",
        
    ],
})

Step 3: Run the Pipeline

Run the pipeline using the pipeline.run method:

pipeline = dlt.pipeline(
    pipeline_name="rest_api_example",
    destination="snowflake",
    dataset_name="rest_api_data",
)

load_info = pipeline.run(source)

Step 4: Observe the Issue

Observe the issue where the HeaderCursorPaginator does not work as expected.

Configuration Changes

To resolve the issue, you need to make configuration changes to the PAGINATOR_MAP in the config_setup.py file. Specifically, you need to add the mapping for the HeaderCursorPaginator type.

Solution

To resolve the issue, follow these steps:

Step 1: Open the config_setup.py File

Open the config_setup.py file in your text editor.

Step 2: Add the Mapping for HeaderCursorPaginator

Add the following mapping to the PAGINATOR_MAP dictionary:

PAGINATOR_MAP = {
    # ... existing mappings ...
    "header_cursor": {
        "type": "HeaderCursorPaginator",
        "cursor_key": "NextPageToken",
    },
}

Step 3: Save the Changes

Save the changes to the config_setup.py file.

Conclusion

In conclusion, the HeaderCursorPaginator not working is a common issue in DLT, caused by the missing mapping for this paginator type in the PAGINATOR_MAP configuration. By following the steps outlined in this article, you can resolve the issue and use the HeaderCursorPaginator seamlessly with the NextPageToken header.

Additional Information

  • DLT version: 1.8.1
  • Operating system: macOS
  • Runtime environment: Local
  • Python version: 3.13
  • DLT data source: No response
  • DLT destination: No response
  • Other deployment details: No response
    HeaderCursorPaginator Not Working: Frequently Asked Questions (FAQs) ====================================================================

Introduction

As a user of the Data Lineage Tool (DLT), you may have encountered issues with the HeaderCursorPaginator not working as expected. This article aims to provide a comprehensive list of Frequently Asked Questions (FAQs) related to the HeaderCursorPaginator issue.

Q: What is the HeaderCursorPaginator?

A: The HeaderCursorPaginator is a paginator type provided by DLT, which allows users to paginate data using the NextPageToken header.

Q: Why is the HeaderCursorPaginator not working?

A: The HeaderCursorPaginator is not working due to the missing mapping for this paginator type in the PAGINATOR_MAP configuration.

Q: How do I resolve the issue?

A: To resolve the issue, you need to add the mapping for the HeaderCursorPaginator type to the PAGINATOR_MAP dictionary in the config_setup.py file.

Q: What is the correct mapping for the HeaderCursorPaginator?

A: The correct mapping for the HeaderCursorPaginator is:

PAGINATOR_MAP = {
    # ... existing mappings ...
    "header_cursor": {
        "type": "HeaderCursorPaginator",
        "cursor_key": "NextPageToken",
    },
}

Q: Where do I find the config_setup.py file?

A: The config_setup.py file is typically located in the root directory of your DLT project.

Q: How do I update the PAGINATOR_MAP dictionary?

A: To update the PAGINATOR_MAP dictionary, simply open the config_setup.py file in your text editor, add the correct mapping for the HeaderCursorPaginator, and save the changes.

Q: What if I'm still experiencing issues after updating the PAGINATOR_MAP dictionary?

A: If you're still experiencing issues after updating the PAGINATOR_MAP dictionary, try restarting your DLT pipeline or checking the DLT logs for any errors.

Q: Can I use the HeaderCursorPaginator with other paginator types?

A: Yes, you can use the HeaderCursorPaginator with other paginator types. However, you need to ensure that the PAGINATOR_MAP dictionary is correctly configured for each paginator type.

Q: How do I troubleshoot issues with the HeaderCursorPaginator?

A: To troubleshoot issues with the HeaderCursorPaginator, try checking the DLT logs for any errors, verifying the PAGINATOR_MAP dictionary, and ensuring that the HeaderCursorPaginator is correctly configured.

Conclusion

In conclusion, the HeaderCursorPaginator not working is a common issue in DLT, caused by the missing mapping for this paginator type in the PAGINATOR_MAP configuration. By following the steps outlined in this article, you can resolve the issue and use the HeaderCursorPaginator seamlessly with the NextPageToken header.

Additional Information

  • DLT version: 1.8.1
  • Operating system: macOS
  • Runtime environment: Local
  • Python version: 3.13
  • DLT data source: No response
  • DLT destination: No response
  • Other deployment details: No response