aws: update support for additional regions

[ShelbyZ]

• add new endpoint suffixes
• use mapping between region prefix to endpoint suffix
• update flb_aws_endpoint to use new mapping
• update test_flb_aws_endpoint to test additional regions

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Testing
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• [] Example configuration file for the change
• [] Debug log output from testing the change

• [] Attached Valgrind output that shows no leaks or memory corruption was found

If this is a change to packaging of containers or native binaries then please confirm it works for all targets.

• [N/A] Run local packaging test showing all targets (including any new ones) build.
• [N/A] Set ok-package-test label to test for all targets (requires maintainer to do).

Documentation

• Documentation required for this feature

Should work to expand changes merged into fluent/fluent-bit-docs#2507 to list out isolated region details.

Backporting

• [] Backport to latest stable release.

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Fluent Bit is licensed under Apache 2.0, by submitting this pull request I understand that this code will be released under the terms of that license.

Summary by CodeRabbit

• New Features

  • Added support for additional AWS region families, including government and specialized isolated cloud domains.

• Bug Fixes

  • Improved endpoint resolution with a table-driven region→suffix mapping and a safe default.
  • Added null-parameter handling so missing inputs produce no endpoint.
  • Expanded tests to cover new region suffixes and null cases.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 749902f9-a429-4de8-be8d-0d17ec8152b1

📥 Commits

Reviewing files that changed from the base of the PR and between 7eb79ff and 4673da7.

📒 Files selected for processing (2)

• src/aws/flb_aws_util.c
• tests/internal/aws_util.c

✅ Files skipped from review due to trivial changes (1)

• tests/internal/aws_util.c

🚧 Files skipped from review as they are similar to previous changes (1)

• src/aws/flb_aws_util.c

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📝 Walkthrough

Walkthrough

Refactored AWS endpoint resolution in flb_aws_util.c to use a table-driven region-prefix → domain-suffix mapping, added null-guards returning NULL for missing inputs, and extended tests in tests/internal/aws_util.c to cover null parameters and additional isolated-region suffixes.

Changes

Cohort / File(s)	Summary
AWS Endpoint Resolution src/aws/flb_aws_util.c	Replaced hard-coded special-case suffix logic with a table (endpoint_suffixes) of region-prefix → domain-suffix entries (first-match via strncmp). Added new constants for multiple non-standard suffixes and null-guards to return NULL when service or region is NULL.
Tests: Endpoint Coverage tests/internal/aws_util.c	Updated test_flb_aws_endpoint() to assert NULL returned for NULL inputs, refreshed China/EU-Sovereign expectations, and added assertions for S3 endpoints in C2S, SC2S, CSP, and ADC-E regions; paired flb_free() calls for allocated endpoints.

Estimated code review effort

🎯 3 (Moderate) | ⏱️ ~25 minutes

Possibly related PRs

• aws: switch AWS Endpoints for European Souvereign Cloud #11356 — Modifies src/aws/flb_aws_util.c endpoint suffix handling and tests, overlapping region-suffix logic changes.

Suggested reviewers

• edsiper
• niedbalski
• patrick-stephens
• sparrc
• cosmo0920
• celalettin1286

Poem

🐰✨ I hopped through suffix fields at dawn,
Replaced old checks with a tidy spawn,
Table matches first, no guesswork now,
Null-safe paths make the callers bow,
Suffixes lined up — hop, code, and yawn.

🚥 Pre-merge checks | ✅ 2 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 33.33% which is insufficient. The required threshold is 80.00%.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (2 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title 'aws: update support for additional regions' directly aligns with the core changes: adding new AWS endpoint suffixes and region prefix mappings to support additional regions.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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