Incorrect API Docs For `/records`

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Introduction

In this article, we will discuss an issue with the API documentation for the /records endpoint in the External-DNS project. Specifically, we will explore how the Swagger OpenAPI documentation differs from the actual JSON encoding of the API request. This discrepancy can lead to confusion and errors when using the API, particularly when writing custom bindings in languages other than Go.

The Issue

The Swagger OpenAPI documentation for the /records endpoint is provided in the webhook.yaml file on the External-DNS GitHub repository. According to this documentation, the API supports the following methods:

  • create
  • delete
  • updateOld
  • updateNew

However, when we examine the plan.go file, which defines the struct for the API request, we see that the fields do not contain the necessary json: tags to specify the JSON encoding. As a result, when the API request is encoded as JSON, the field names are actually encoded in camelCase, resulting in the following values:

  • Create
  • Delete
  • UpdateOld
  • UpdateNew

The Problem

The issue here is that the Swagger OpenAPI documentation and the actual JSON encoding of the API request do not match. This can lead to confusion and errors when using the API, particularly when writing custom bindings in languages other than Go. For example, if we are writing a custom binding in Python, we would expect the API request to be encoded in the following format:

{
  "create": true,
  "delete": true,
  "updateOld": true,
  "updateNew": true
}

However, due to the discrepancy between the Swagger OpenAPI documentation and the actual JSON encoding, the API request would actually be encoded in the following format:

{
  "Create": true,
  "Delete": true,
  "UpdateOld": true,
  "UpdateNew": true
}

This can lead to errors and unexpected behavior when using the API.

The Impact

The impact of this issue is significant, particularly for developers who are writing custom bindings in languages other than Go. The discrepancy between the Swagger OpenAPI documentation and the actual JSON encoding of the API request can lead to errors and unexpected behavior, which can be difficult to debug and resolve.

The Solution

To resolve this issue, the Swagger OpenAPI documentation should be updated to reflect the actual JSON encoding of the API request. This can be done by adding the necessary json: tags to the fields in the plan.go file to specify the JSON encoding.

Conclusion

In conclusion, the issue with the API documentation for the /records endpoint in the External-DNS project is a significant problem that can lead to errors and unexpected behavior when using the API. By updating the Swagger OpenAPI documentation to reflect the actual JSON encoding of the API request, we can resolve this issue and ensure that the API is used correctly and efficiently.

Recommendations

Based on our analysis of this issue, we recommend the following:

  • Update the Swagger OpenAPI documentation to reflect the actual JSON encoding of the API request.
  • Add the necessary json: tags to the fields in the plan.go file to specify the JSON encoding.
  • Test the API thoroughly to ensure that it is working correctly and efficiently.

Environment

The following environment was used to reproduce this issue:

  • External-DNS version: current master 44f1008ee1d3ea3de98a80992dbe49c809616b67
  • DNS provider: custom in Python
  • Others: ---
    Q&A: Incorrect API Docs for /records =====================================

Q: What is the issue with the API documentation for the /records endpoint?

A: The issue is that the Swagger OpenAPI documentation for the /records endpoint is provided in the webhook.yaml file, but it does not match the actual JSON encoding of the API request. Specifically, the API request is encoded in camelCase, but the Swagger OpenAPI documentation lists the field names in PascalCase.

Q: Why is this a problem?

A: This is a problem because it can lead to errors and unexpected behavior when using the API, particularly when writing custom bindings in languages other than Go. For example, if we are writing a custom binding in Python, we would expect the API request to be encoded in the following format:

{
  "create": true,
  "delete": true,
  "updateOld": true,
  "updateNew": true
}

However, due to the discrepancy between the Swagger OpenAPI documentation and the actual JSON encoding, the API request would actually be encoded in the following format:

{
  "Create": true,
  "Delete": true,
  "UpdateOld": true,
  "UpdateNew": true
}

This can lead to errors and unexpected behavior when using the API.

Q: How can I reproduce this issue?

A: To reproduce this issue, simply read the Swagger OpenAPI documentation for the /records endpoint and compare it to the actual JSON encoding of the API request. You can do this by examining the plan.go file, which defines the struct for the API request.

Q: What is the impact of this issue?

A: The impact of this issue is significant, particularly for developers who are writing custom bindings in languages other than Go. The discrepancy between the Swagger OpenAPI documentation and the actual JSON encoding of the API request can lead to errors and unexpected behavior, which can be difficult to debug and resolve.

Q: How can I resolve this issue?

A: To resolve this issue, the Swagger OpenAPI documentation should be updated to reflect the actual JSON encoding of the API request. This can be done by adding the necessary json: tags to the fields in the plan.go file to specify the JSON encoding.

Q: What are the recommendations for resolving this issue?

A: Based on our analysis of this issue, we recommend the following:

  • Update the Swagger OpenAPI documentation to reflect the actual JSON encoding of the API request.
  • Add the necessary json: tags to the fields in the plan.go file to specify the JSON encoding.
  • Test the API thoroughly to ensure that it is working correctly and efficiently.

Q: What is the environment that was used to reproduce this issue?

A: The following environment was used to reproduce this issue:

  • External-DNS version: current master 44f1008ee1d3ea3de98a80992dbe49c809616b67
  • DNS provider: custom in Python
  • Others: ---