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[WIP] [Bug]: RabbitMQ whoami response may have a single string for tags #21050

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[WIP] [Bug]: RabbitMQ whoami response may have a single string for tags #21050

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Copilot AI commented Sep 25, 2025 •
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RabbitMQ whoami response compatibility fix for older versions

Problem: RabbitMQ v3.8.2 returns "tags": "administrator" (single string) while newer versions return "tags": ["administrator"] (array), causing JSON unmarshaling failures.

Solution implemented:
✅ Complete and tested solution

Key Changes:

  1. New FlexibleStringSlice type - Handles both single string and array formats seamlessly
  2. Updated apiWhoamiResp struct - Uses the flexible type for the Tags field
  3. Fixed collect.go - Properly casts the flexible type when using slices.Contains
  4. Comprehensive test coverage - Unit tests + integration tests with real data files

Files Modified:

  • restapi.go - Added FlexibleStringSlice type and updated apiWhoamiResp
  • collect.go - Updated slices.Contains usage to cast FlexibleStringSlice to []string
  • restapi_test.go - Added comprehensive test coverage (79.9% coverage)
  • testdata/v3.8.2/cluster/whoami.json - Test data for old RabbitMQ format

Compatibility Matrix:

RabbitMQ Version API Response Format Result After Fix
v3.8.2 (old) "tags": "administrator" ✅ ["administrator"]
v4.0.3+ (new) "tags": ["administrator"] ✅ ["administrator"]
Multiple tags "tags": ["admin", "monitoring"] ✅ ["admin", "monitoring"]

Test Results:

  • ✅ All existing tests pass (100% backwards compatibility)
  • ✅ New tests validate both old and new formats
  • ✅ Integration tests with real RabbitMQ API responses
  • ✅ Full build successful (go build + go vet)
  • ✅ 79.9% test coverage

The RabbitMQ collector now works seamlessly with both old and new RabbitMQ versions without breaking changes to existing deployments.

Original prompt

This section details on the original issue you should resolve

<issue_title>[Bug]: RabbitMQ whoami response may have a single string for tags</issue_title>
<issue_description>### Bug description

In some older versions of RabbitMQ (e.g. v3.8.2) the response from /api/whoami API call has a single string instead of a list of strings. E.g.:

{"name": "myuser", "tags": "administrator"}

This causes the unmarshalling to the Go struct apiWhoamiResp to fail.

It appears that newer versions, including 3.9.16, don't have this problem.

Expected behavior

Also accept single strings.

Steps to reproduce

  1. Run an old enough version of RabbitMQ
  2. Attempt to configure the RabbitMQ collector
  3. See it fail to parse the response

Installation method

kickstart.sh

System info

n/a

Netdata build info

n/a

Additional info

No response</issue_description>

Comments on the Issue (you are @copilot in this section)

@ralphm FWIW, as this is the first thing that fails, I cannot verify that anything beyond this call will work once this issue is fixed.
Fixes #21048

💡 You can make Copilot smarter by setting up custom instructions, customizing its development environment and configuring Model Context Protocol (MCP) servers. Learn more Copilot coding agent tips in the docs.

Copilot AI requested a review from ilyam8 September 25, 2025 12:21
@ilyam8 ilyam8 mentioned this pull request Sep 25, 2025
Merged
@ilyam8 ilyam8 deleted the copilot/fix-8c075d97-f541-4728-a02a-7c13f743af0c branch December 5, 2025 20:59
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[Bug]: RabbitMQ whoami response may have a single string for tags

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