out_loki: add oauth2 support for loki - #12401
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Included review availability: Your plan provides up to 8 included reviews per hour; 6 remain after this review. 📝 WalkthroughWalkthroughThe Loki output plugin adds OAuth2 client-credentials authentication with ChangesLoki OAuth2 support
Priority: ➖ Normal Estimated code review effort: 4 (Complex) | ~45 minutes Change: Feature Sequence Diagram(s)sequenceDiagram
participant OAuthService
participant LokiPlugin
participant OAuthTokenEndpoint
participant LokiEndpoint
OAuthService->>LokiPlugin: start with OAuth2 configuration
LokiPlugin->>OAuthTokenEndpoint: request client-credentials token
OAuthTokenEndpoint-->>LokiPlugin: return access token
LokiPlugin->>LokiEndpoint: send payload with bearer token
Merge Risk: 🟡 Moderate · up to OAuth2 credentials can be exposed when a token endpoint is configured with HTTP. Require HTTPS before merging this authentication support. 🚥 Pre-merge checks | ✅ 4 | ❌ 1❌ Failed checks (1 warning)
✅ Passed checks (4 passed)
✨ Finishing Touches🧪 Generate unit tests (beta)
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Signed-off-by: Umar Hussain <umarhussain.work@gmail.com>
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Example Configuration(s):pipeline:
outputs:
# oauth2 with client id and secret
- name: loki
match: "*"
host: 127.0.0.1
port: ${TEST_SUITE_HTTP_PORT}
line_format: json
labels: job=integration-test
oauth2.enable: true
oauth2.token_url: http://127.0.0.1:${TEST_SUITE_HTTP_PORT}/oauth/token
oauth2.client_id: client1
oauth2.client_secret: secret1
oauth2.scope: logs.write
# oauth2 with private key jwt
- name: loki
match: "*"
host: 127.0.0.1
port: ${TEST_SUITE_HTTP_PORT}
line_format: json
labels: job=integration-test
oauth2.enable: true
oauth2.token_url: http://127.0.0.1:${TEST_SUITE_HTTP_PORT}/oauth/token
oauth2.client_id: client1
oauth2.auth_method: private_key_jwt
oauth2.jwt_key_file: ${PRIVATE_KEY_TEST}
oauth2.jwt_cert_file: ${CERTIFICATE_TEST}
oauth2.jwt_aud: http://127.0.0.1:${TEST_SUITE_HTTP_PORT}/oauth/tokenDebug test output:./build/bin/flb-rt-out_loki
Test remove_keys_remove_map... [ OK ]
Test labels_ra... [ OK ]
Test remove_keys... [ OK ]
Test remove_keys_workers... [ OK ]
Test remove_keys_multiple_instances... [ OK ]
Test tenant_id_key_splits_requests... [ OK ]
Test tenant_id_key_partial_success... [2026/09/12 10:05:10.502] [error] [output:loki:loki.0] 127.0.0.1:18084, HTTP status=400 Not retrying.
bad tenant
[ OK ]
Test tenant_id_key_partial_error... [2026/09/12 10:05:14.502] [error] [output:loki:loki.0] 127.0.0.1:18085, HTTP status=400 Not retrying.
bad tenant
[2026/09/12 10:05:16.502] [error] [output:loki:loki.0] 127.0.0.1:18085, HTTP status=400 Not retrying.
bad tenant
[2026/09/12 10:05:16.502] [error] [engine] chunk '13126-1789207514.15449315.flb' cannot be retried: task_id=0, input=lib.0 > output=loki.0
[ OK ]
Test long_unicode_payload_boundaries... [ OK ]
Test basic... [ OK ]
Test labels... [ OK ]
Test label_keys... [ OK ]
Test line_format... [ OK ]
Test drop_single_key_off... [ OK ]
Test drop_single_key_on... [ OK ]
Test drop_single_key_raw... [ OK ]
Test label_map_path... [ OK ]
Test float_value... [ OK ]
Test structured_metadata_map_single_map... [ OK ]
Test structured_metadata_map_two_maps... [ OK ]
Test structured_metadata_map_sub_map... [ OK ]
Test structured_metadata_map_both_with_non_map_value... [ OK ]
Test structured_metadata_map_value_explicit_override_map_key... [ OK ]
Test structured_metadata_explicit_only_no_map... [ OK ]
Test structured_metadata_explicit_only_map... [ OK ]
Test structured_metadata_map_and_explicit... [ OK ]
Test structured_metadata_map_single_missing_map... [ OK ]
Test structured_metadata_map_invalid_ra_key... [ OK ]
SUCCESS: All unit tests have passed.Valgrind outputs:valgrind --leak-check=full ./build/bin/flb-rt-out_loki
==23804== Memcheck, a memory error detector
==23804== Copyright (C) 2002-2024, and GNU GPL'd, by Julian Seward et al.
==23804== Using Valgrind-3.24.0 and LibVEX; rerun with -h for copyright info
==23804== Command: ./build/bin/flb-rt-out_loki
==23804==
Test remove_keys_remove_map... [ OK ]
Test labels_ra... [ OK ]
Test remove_keys... [ OK ]
Test remove_keys_workers... [ OK ]
Test remove_keys_multiple_instances... ==23804== Warning: invalid file descriptor -1 in syscall close()
[ OK ]
Test tenant_id_key_splits_requests... ==23804== Warning: invalid file descriptor -1 in syscall close()
[ OK ]
Test tenant_id_key_partial_success... [2026/09/12 10:20:56.508] [error] [output:loki:loki.0] 127.0.0.1:18084, HTTP status=400 Not retrying.
bad tenant
==23804== Warning: invalid file descriptor -1 in syscall close()
[ OK ]
Test tenant_id_key_partial_error... [2026/09/12 10:21:00.507] [error] [output:loki:loki.0] 127.0.0.1:18085, HTTP status=400 Not retrying.
bad tenant
[2026/09/12 10:21:02.509] [error] [output:loki:loki.0] 127.0.0.1:18085, HTTP status=400 Not retrying.
bad tenant
[2026/09/12 10:21:02.517] [error] [engine] chunk '23804-1789208460.55832214.flb' cannot be retried: task_id=0, input=lib.0 > output=loki.0
==23804== Warning: invalid file descriptor -1 in syscall close()
[ OK ]
Test long_unicode_payload_boundaries... [ OK ]
Test basic... [ OK ]
Test labels... [ OK ]
Test label_keys... [ OK ]
Test line_format... [ OK ]
Test drop_single_key_off... [ OK ]
Test drop_single_key_on... [ OK ]
Test drop_single_key_raw... [ OK ]
Test label_map_path... [ OK ]
Test float_value... [ OK ]
Test structured_metadata_map_single_map... [ OK ]
Test structured_metadata_map_two_maps... [ OK ]
Test structured_metadata_map_sub_map... [ OK ]
Test structured_metadata_map_both_with_non_map_value... [ OK ]
Test structured_metadata_map_value_explicit_override_map_key... [ OK ]
Test structured_metadata_explicit_only_no_map... [ OK ]
Test structured_metadata_explicit_only_map... [ OK ]
Test structured_metadata_map_and_explicit... [ OK ]
Test structured_metadata_map_single_missing_map... [ OK ]
Test structured_metadata_map_invalid_ra_key... [ OK ]
SUCCESS: All unit tests have passed.
==23804==
==23804== HEAP SUMMARY:
==23804== in use at exit: 0 bytes in 0 blocks
==23804== total heap usage: 79,123 allocs, 79,123 frees, 32,607,522 bytes allocated
==23804==
==23804== All heap blocks were freed -- no leaks are possible
==23804==
==23804== For lists of detected and suppressed errors, rerun with: -s
==23804== ERROR SUMMARY: 0 errors from 0 contexts (suppressed: 0 from 0)Integration test with valgrind ./run_tests.py --valgrind-strict scenarios/out_loki
=============================================================================================================================================== test session starts ================================================================================================================================================
platform linux -- Python 3.13.5, pytest-8.2.2, pluggy-1.5.0 -- /IdeaProjects/fluent-bit/tests/integration/.venv/bin/python3
cachedir: .pytest_cache
rootdir: /IdeaProjects/fluent-bit/tests/integration
configfile: pytest.ini
plugins: xdist-3.8.0
collected 3 items
scenarios/out_loki/tests/test_out_loki_001.py::test_out_loki_preserves_long_unicode_json_strings PASSED [ 33%]
scenarios/out_loki/tests/test_out_loki_001.py::test_out_loki_oauth2_auth_matrix[oauth2_basic] PASSED [ 66%]
scenarios/out_loki/tests/test_out_loki_001.py::test_out_loki_oauth2_auth_matrix[oauth2_private_key_jwt] PASSED [100%]
================================================================================================================================================ 3 passed in 13.81s ================================================================================================================================================
2026-09-12 10:26:35,650 - INFO - Unconfiguring pytest |
umarhussain15
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September 12, 2026 10:37
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Inline comments:
In `@plugins/out_loki/loki.c`:
- Around line 2079-2080: Update the Loki configuration validation before the
request path using ctx->oauth2_ctx to reject configurations that enable OAuth2
alongside http_user/http_passwd or bearer_token. Return a configuration error
for these conflicting authentication modes, while preserving OAuth2-only and
non-OAuth2 authentication behavior.
- Line 1150: In the OAuth2 configuration failure path of loki_config_create,
replace the direct flb_free(ctx) cleanup with loki_config_destroy(ctx), then
clear the context before returning so all context-owned lists are released
through the normal destructor.
- Around line 1271-1273: Update flb_oauth2_create_from_config() to validate that
the configured OAuth2 token_url uses the HTTPS scheme before creating the
upstream, rejecting non-HTTPS URLs with the existing configuration-error path.
Preserve the current required token_url and client_id validation and prevent
oauth2_setup_upstream() from being reached for invalid schemes.
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📒 Files selected for processing (5)
plugins/out_loki/loki.cplugins/out_loki/loki.htests/integration/scenarios/out_loki/config/out_loki_oauth2_basic.yamltests/integration/scenarios/out_loki/config/out_loki_oauth2_private_key_jwt.yamltests/integration/scenarios/out_loki/tests/test_out_loki_001.py
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Signed-off-by: Umar Hussain <umarhussain.work@gmail.com>
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Inline comments:
In `@plugins/out_loki/loki.c`:
- Line 1257: Update loki_config_create() so every OAuth2 validation or
flb_oauth2_create_from_config() failure, including the return NULL path at line
1257, calls loki_config_destroy(ctx), clears the instance context with
flb_output_set_context(ins, NULL), and then returns NULL.
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plugins/out_loki/loki.ctests/runtime/out_loki.c
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Signed-off-by: Umar Hussain <umarhussain.work@gmail.com>
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