⚡️ Speed up function get_auth_service by 279% in PR #11654 (feat/pluggable-auth-service-1.8)

[codeflash-ai]

⚡️ This pull request contains optimizations for PR #11654

If you approve this dependent PR, these changes will be merged into the original PR branch feat/pluggable-auth-service-1.8.

This PR will be automatically closed if the original PR is merged.

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📄 279% (2.79x) speedup for get_auth_service in src/backend/base/langflow/services/deps.py

⏱️ Runtime : 12.8 milliseconds → 3.37 milliseconds (best of 17 runs)

📝 Explanation and details

The optimized code achieves a 279% speedup (from 12.8ms to 3.37ms) through two key optimizations:

1. Module-level caching of get_service_manager

The original code imported get_service_manager inside the get_service function on every call. The optimized version imports it once at module load time as _get_service_manager, eliminating repeated import overhead. While Python caches imports in sys.modules, the attribute lookup and function resolution still has cost on every call—this is visible in the line profiler showing ~345-539ns per call just for the import and manager retrieval.

2. Short-circuit pattern in get_auth_service (Primary optimization)

The original get_auth_service always instantiated AuthServiceFactory() and passed it to get_service, even when the auth service already existed in the service manager. The line profiler shows this flow taking 348.5ms total, with 99.9% spent in get_service (which internally calls service_manager.get()).

The optimized version:

• First checks if the service already exists via service_manager.get()
• Only imports and instantiates AuthServiceFactory() when the service is missing
• Avoids the redundant factory object allocation on every call after the first successful registration

Why this matters: After the service manager is initialized (which happens once early), subsequent calls to get_auth_service were wastefully creating factory objects that were never used. The optimized version detects the already-registered service (269 out of 275 calls hit the fast path per profiler) and returns immediately, spending only 280ms vs 348ms total.

The line profiler confirms this: in the optimized version, get_auth_service completes in 280ms with 99.8% of time in the service_manager.get() call itself (unavoidable), while the original spent additional time creating unused factory objects and making redundant service lookups.

Test case performance: The stability test with 150 repeated calls particularly benefits from this optimization, as each call after initialization avoids unnecessary object allocation and double-lookup overhead.

✅ Correctness verification report:

Test	Status
⚙️ Existing Unit Tests	🔘 None Found
🌀 Generated Regression Tests	✅ 151 Passed
⏪ Replay Tests	🔘 None Found
🔎 Concolic Coverage Tests	🔘 None Found
📊 Tests Coverage	100.0%

🌀 Click to see Generated Regression Tests

import concurrent.futures
import time

# imports
import pytest  # used for our unit tests
# Import the factory that is used as the default inside get_auth_service.
# We don't instantiate or replace it; we only import it for introspection/assertion purposes.
from langflow.services.auth.factory import AuthServiceFactory
from langflow.services.deps import get_auth_service
# Import the real BaseAuthService class so we can assert isinstance checks against it.
from lfx.services.auth.base import BaseAuthService






def test_default_factory_class_available_and_usable_by_contract():
    """
    Basic/Edge test: Verify that the default factory class referenced in the implementation
    (AuthServiceFactory) is importable and is a real object (sanity check on dependency availability).
    This doesn't instantiate or replace anything; it just asserts the factory type exists and is callable.
    """

    # Instantiating the factory should not raise immediately (constructor should be usable).
    # We do not use the factory instance to alter production behavior.
    factory_instance = AuthServiceFactory()



#------------------------------------------------
from unittest.mock import MagicMock, Mock, patch

import pytest
from langflow.services.deps import get_auth_service
from langflow.services.schema import ServiceType
from lfx.services.auth.base import BaseAuthService



















def test_get_auth_service_stability_under_load():
    """Test get_auth_service stability with repeated instantiation."""
    # Perform 150 calls and track success rate
    successful_calls = 0
    for _ in range(150):
        try:
            codeflash_output = get_auth_service(); service = codeflash_output
            if isinstance(service, BaseAuthService):
                successful_calls += 1
        except Exception:
            pass

To edit these changes git checkout codeflash/optimize-pr11654-2026-02-09T00.45.27 and push.

[codecov]

Codecov Report

❌ Patch coverage is 73.92996% with 201 lines in your changes missing coverage. Please review.
✅ Project coverage is 35.22%. Comparing base (22607cc) to head (68c6b53).
⚠️ Report is 25 commits behind head on main.

Files with missing lines	Patch %	Lines
src/backend/base/langflow/services/auth/service.py	66.66%	135 Missing ⚠️
src/lfx/src/lfx/services/auth/service.py	70.58%	15 Missing ⚠️
src/lfx/src/lfx/services/auth/exceptions.py	62.50%	9 Missing ⚠️
src/backend/base/langflow/services/auth/utils.py	89.18%	8 Missing ⚠️
src/backend/base/langflow/api/v1/login.py	50.00%	5 Missing ⚠️
src/backend/base/langflow/api/v1/models.py	0.00%	4 Missing ⚠️
src/lfx/src/lfx/services/auth/base.py	93.22%	4 Missing ⚠️
src/backend/base/langflow/__main__.py	50.00%	3 Missing ⚠️
src/backend/base/langflow/api/v1/store.py	0.00%	2 Missing ⚠️
src/backend/base/langflow/api/v1/users.py	80.00%	2 Missing ⚠️
... and 11 more

❌ Your project status has failed because the head coverage (42.10%) is below the target coverage (60.00%). You can increase the head coverage or adjust the target coverage.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #11659      +/-   ##
==========================================
+ Coverage   35.02%   35.22%   +0.19%     
==========================================
  Files        1515     1521       +6     
  Lines       72567    72925     +358     
  Branches    10934    10935       +1     
==========================================
+ Hits        25418    25687     +269     
- Misses      45755    45843      +88     
- Partials     1394     1395       +1     

Flag	Coverage Δ
backend	55.72% <71.90%> (+0.15%)	⬆️
lfx	42.10% <81.32%> (+0.26%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
src/backend/base/langflow/api/v1/api_key.py	73.33% <100.00%> (ø)
src/backend/base/langflow/api/v1/endpoints.py	71.81% <100.00%> (-0.28%)	⬇️
src/backend/base/langflow/api/v1/mcp.py	72.57% <100.00%> (ø)
src/backend/base/langflow/api/v2/schemas.py	100.00% <100.00%> (ø)
...c/backend/base/langflow/services/auth/constants.py	100.00% <100.00%> (ø)
...kend/base/langflow/services/auth/mcp_encryption.py	73.07% <100.00%> (-1.93%)	⬇️
...rc/backend/base/langflow/services/event_manager.py	75.42% <100.00%> (ø)
src/backend/base/langflow/services/factory.py	83.60% <100.00%> (+0.55%)	⬆️
...kend/base/langflow/services/variable/kubernetes.py	0.00% <ø> (ø)
src/lfx/src/lfx/services/initialize.py	0.00% <ø> (ø)
... and 25 more

... and 13 files with indirect coverage changes

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[codeflash-ai]

This PR has been automatically closed because the original PR #11827 by vjgit96 was closed.