⚡️ Speed up method AuthService.verify_password by 17% in PR #10702 (pluggable-auth-service)

[codeflash-ai]

⚡️ This pull request contains optimizations for PR #10702

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

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

---

📄 17% (0.17x) speedup for AuthService.verify_password in src/backend/base/langflow/services/auth/service.py

⏱️ Runtime : 1.00 millisecond → 862 microseconds (best of 128 runs)

📝 Explanation and details

The optimization eliminates redundant attribute traversal by caching the verify method reference during initialization.

Key Changes:

• Added self._verify = settings_service.auth_settings.pwd_context.verify in __init__ to cache the bound method
• Modified verify_password to use the cached self._verify instead of traversing self.settings.auth_settings.pwd_context.verify

Why It's Faster:
The original code performs 3 attribute lookups (self.settings → auth_settings → pwd_context → verify) on every call to verify_password. The optimization reduces this to a single attribute lookup (self._verify) by pre-computing the method reference once during initialization.

Performance Impact:
The line profiler shows a 34% reduction in per-call overhead (from 2921.4ns to 1930.9ns per call), resulting in a 16% overall speedup. This optimization is particularly effective because:

• Password verification is typically called frequently in authentication flows
• The attribute chain traversal overhead becomes significant when called thousands of times (2759 hits in the profile)
• The cached method maintains the same behavior while eliminating repetitive lookups

Test Case Benefits:
The optimization shows consistent improvements across all test scenarios, from basic verification tests to large-scale tests with 500+ password verifications, making it especially valuable for high-throughput authentication workloads.

✅ Correctness verification report:

Test	Status
⚙️ Existing Unit Tests	🔘 None Found
🌀 Generated Regression Tests	✅ 2802 Passed
⏪ Replay Tests	🔘 None Found
🔎 Concolic Coverage Tests	🔘 None Found
📊 Tests Coverage	100.0%

🌀 Generated Regression Tests and Runtime

from unittest.mock import MagicMock

imports

import pytest
from langflow.services.auth.service import AuthService

--- Function to test and minimal dependencies ---

Minimal stub for pwd_context with verify method

class DummyPwdContext:
def verify(self, plain_password, hashed_password):
# Simulate a real password verification logic for testing
# For the sake of this test, let's assume:
# - hashed_password is always "hashed:<plain_password>"
# - returns True if hashed_password matches this scheme, else False
if not isinstance(plain_password, str) or not isinstance(hashed_password, str):
raise TypeError("Passwords must be strings")
if plain_password == "" or hashed_password == "":
# Simulate behavior: empty passwords never match
return False
if hashed_password == f"hashed:{plain_password}":
return True
return False

Minimal stub for auth_settings

class DummyAuthSettings:
def init(self):
self.pwd_context = DummyPwdContext()

Minimal stub for SettingsService

class SettingsService:
def init(self):
self.auth_settings = DummyAuthSettings()

ServiceType stub

class ServiceType:
class AUTH_SERVICE:
value = "auth_service"

AuthServiceBase stub

class AuthServiceBase:
pass
from langflow.services.auth.service import AuthService

--- Unit Tests ---

@pytest.fixture
def auth_service():
# Fixture to provide an AuthService instance with dummy settings
return AuthService(SettingsService())

1. Basic Test Cases

def test_correct_password_returns_true(auth_service):
# Test that correct password returns True
plain = "hunter2"
hashed = "hashed:hunter2"
codeflash_output = auth_service.verify_password(plain, hashed)

def test_incorrect_password_returns_false(auth_service):
# Test that incorrect password returns False
plain = "hunter2"
hashed = "hashed:wrongpass"
codeflash_output = auth_service.verify_password(plain, hashed)

def test_completely_wrong_hash_returns_false(auth_service):
# Test that a hash not matching the scheme returns False
plain = "hunter2"
hashed = "somegarbagehash"
codeflash_output = auth_service.verify_password(plain, hashed)

def test_case_sensitivity(auth_service):
# Passwords are case-sensitive
plain = "Hunter2"
hashed = "hashed:hunter2"
codeflash_output = auth_service.verify_password(plain, hashed)

def test_leading_trailing_whitespace(auth_service):
# Whitespace in password matters
plain = "hunter2 "
hashed = "hashed:hunter2"
codeflash_output = auth_service.verify_password(plain, hashed)

def test_leading_trailing_whitespace_in_hash(auth_service):
# Whitespace in hash matters
plain = "hunter2"
hashed = "hashed:hunter2 "
codeflash_output = auth_service.verify_password(plain, hashed)

2. Edge Test Cases

def test_empty_password_and_hash(auth_service):
# Both empty should return False
codeflash_output = auth_service.verify_password("", "")

def test_empty_password_nonempty_hash(auth_service):
# Empty password, non-empty hash
codeflash_output = auth_service.verify_password("", "hashed:")

def test_nonempty_password_empty_hash(auth_service):
# Non-empty password, empty hash
codeflash_output = auth_service.verify_password("hunter2", "")

def test_password_with_special_characters(auth_service):
# Password with special characters
plain = "!@#$%^&*()_+-=~`"
hashed = f"hashed:{plain}"
codeflash_output = auth_service.verify_password(plain, hashed)

def test_password_with_unicode(auth_service):
# Password with unicode characters
plain = "pässwörd😊"
hashed = f"hashed:{plain}"
codeflash_output = auth_service.verify_password(plain, hashed)

def test_hash_with_unicode(auth_service):
# Hash with unicode, password ascii
plain = "password"
hashed = "hashed:pässwörd😊"
codeflash_output = auth_service.verify_password(plain, hashed)

def test_password_is_none_raises(auth_service):
# None as password should raise TypeError
with pytest.raises(TypeError):
auth_service.verify_password(None, "hashed:None")

def test_hash_is_none_raises(auth_service):
# None as hash should raise TypeError
with pytest.raises(TypeError):
auth_service.verify_password("password", None)

def test_password_and_hash_are_none_raises(auth_service):
# Both None should raise TypeError
with pytest.raises(TypeError):
auth_service.verify_password(None, None)

def test_password_is_integer_raises(auth_service):
# Password as integer should raise TypeError
with pytest.raises(TypeError):
auth_service.verify_password(12345, "hashed:12345")

def test_hash_is_integer_raises(auth_service):
# Hash as integer should raise TypeError
with pytest.raises(TypeError):
auth_service.verify_password("password", 12345)

def test_very_long_password(auth_service):
# Test with a very long password string (edge of reasonable size)
plain = "a" * 512
hashed = f"hashed:{plain}"
codeflash_output = auth_service.verify_password(plain, hashed)

def test_very_long_hash(auth_service):
# Test with a very long hash string (edge of reasonable size)
plain = "hunter2"
hashed = "hashed:" + "hunter2" * 100
codeflash_output = auth_service.verify_password(plain, hashed)

def test_password_with_newlines(auth_service):
# Password containing newlines
plain = "hunter2\n"
hashed = f"hashed:{plain}"
codeflash_output = auth_service.verify_password(plain, hashed)

def test_hash_with_newlines(auth_service):
# Hash containing newlines
plain = "hunter2"
hashed = "hashed:hunter2\n"
codeflash_output = auth_service.verify_password(plain, hashed)

3. Large Scale Test Cases

def test_many_unique_passwords(auth_service):
# Test many unique passwords and hashes
for i in range(100):
plain = f"password{i}"
hashed = f"hashed:password{i}"
codeflash_output = auth_service.verify_password(plain, hashed)
# Incorrect hash
wrong_hashed = f"hashed:password{i+1}"
codeflash_output = auth_service.verify_password(plain, wrong_hashed)

def test_performance_with_large_password(auth_service):
# Test performance/handling with a very large password (1000 chars)
plain = "x" * 1000
hashed = f"hashed:{plain}"
codeflash_output = auth_service.verify_password(plain, hashed)

def test_performance_with_large_hash(auth_service):
# Test performance/handling with a very large hash (1000 chars)
plain = "hunter2"
hashed = "hashed:" + "a" * 994 # total length 1000
codeflash_output = auth_service.verify_password(plain, hashed)

def test_large_batch_of_passwords(auth_service):
# Test a batch of 500 password/hash pairs for correctness
pairs = [(f"user{i}", f"hashed:user{i}") for i in range(500)]
for plain, hashed in pairs:
codeflash_output = auth_service.verify_password(plain, hashed)
codeflash_output = auth_service.verify_password(plain, "hashed:wrong")

def test_large_batch_with_unicode(auth_service):
# Test a batch of 100 unicode password/hash pairs
for i in range(100):
plain = f"pässwörd{i}😊"
hashed = f"hashed:{plain}"
codeflash_output = auth_service.verify_password(plain, hashed)

codeflash_output is used to check that the output of the original code is the same as that of the optimized code.

#------------------------------------------------
from abc import ABC
from unittest.mock import MagicMock

imports

import pytest
from langflow.services.auth.service import AuthService

--- Minimal stubs for dependencies to make the test self-contained ---

Simulate a password context similar to passlib's CryptContext

class DummyPwdContext:
def init(self):
# Store passwords as {plain: hashed}
self._hashes = {}

def hash(self, password):
    # For this dummy, we'll hash as "hashed$" + password (not secure, just for testing)
    hashed = f"hashed${password}"
    self._hashes[password] = hashed
    return hashed

def verify(self, plain_password, hashed_password):
    # Simulate passlib's verify: check if hashed_password matches hash(plain_password)
    expected = f"hashed${plain_password}"
    return hashed_password == expected

Simulate AuthSettings with a pwd_context

class DummyAuthSettings:
def init(self):
self.pwd_context = DummyPwdContext()

Simulate Settings with auth_settings

class DummySettings:
def init(self):
self.auth_settings = DummyAuthSettings()

Simulate SettingsService

class DummySettingsService:
def init(self):
self.settings = DummySettings()

@property
def auth_settings(self):
    return self.settings.auth_settings

class Service(ABC):
name: str
ready: bool = False

def set_ready(self) -> None:
    self.ready = True

from langflow.services.auth.service import AuthService

--- Unit tests for AuthService.verify_password ---

@pytest.fixture
def auth_service():
# Provide a fresh AuthService with dummy settings for each test
return AuthService(DummySettingsService())

-------------------

1. BASIC TEST CASES

-------------------

def test_verify_password_correct(auth_service):
"""Test correct password returns True."""
pwd = "mysecret"
hashed = auth_service.settings.auth_settings.pwd_context.hash(pwd)
codeflash_output = auth_service.verify_password(pwd, hashed)

def test_verify_password_incorrect(auth_service):
"""Test incorrect password returns False."""
pwd = "mysecret"
wrong_pwd = "notmysecret"
hashed = auth_service.settings.auth_settings.pwd_context.hash(pwd)
codeflash_output = auth_service.verify_password(wrong_pwd, hashed)

def test_verify_password_empty_password(auth_service):
"""Test empty password string."""
pwd = ""
hashed = auth_service.settings.auth_settings.pwd_context.hash(pwd)
codeflash_output = auth_service.verify_password("", hashed)
codeflash_output = auth_service.verify_password("notempty", hashed)

def test_verify_password_empty_hash(auth_service):
"""Test with empty hash string (should fail)."""
codeflash_output = auth_service.verify_password("password", "")

def test_verify_password_both_empty(auth_service):
"""Test both password and hash are empty."""
# Hash the empty string to get the correct hash
hashed = auth_service.settings.auth_settings.pwd_context.hash("")
codeflash_output = auth_service.verify_password("", hashed)
codeflash_output = auth_service.verify_password("", "") # "" is not a valid hash

-------------------

2. EDGE TEST CASES

-------------------

def test_verify_password_special_characters(auth_service):
"""Test password with special characters."""
pwd = "!@# $%^&*()_+-=[]{};':,.<>/?`~"
hashed = auth_service.settings.auth_settings.pwd_context.hash(pwd)
codeflash_output = auth_service.verify_password(pwd, hashed)
codeflash_output = auth_service.verify_password(pwd + "x", hashed)

def test_verify_password_unicode(auth_service):
"""Test password with unicode characters."""
pwd = "pässwörd😊"
hashed = auth_service.settings.auth_settings.pwd_context.hash(pwd)
codeflash_output = auth_service.verify_password(pwd, hashed)
codeflash_output = auth_service.verify_password("pässwörd", hashed)

def test_verify_password_long_password(auth_service):
"""Test very long password."""
pwd = "a" * 512
hashed = auth_service.settings.auth_settings.pwd_context.hash(pwd)
codeflash_output = auth_service.verify_password(pwd, hashed)
# Off-by-one
codeflash_output = auth_service.verify_password(pwd + "b", hashed)

def test_verify_password_wrong_hash_format(auth_service):
"""Test with a hash that is not in expected format."""
# Our dummy expects 'hashed prefix
codeflash_output = auth_service.verify_password("password", "totallyinvalidhash")

def test_verify_password_similar_passwords(auth_service):
"""Test passwords that differ by case or whitespace."""
pwd = "Password"
hashed = auth_service.settings.auth_settings.pwd_context.hash(pwd)
codeflash_output = auth_service.verify_password("password", hashed)
codeflash_output = auth_service.verify_password("Password ", hashed)

def test_verify_password_non_string_inputs(auth_service):
"""Test non-string types as input (should handle gracefully)."""
hashed = auth_service.settings.auth_settings.pwd_context.hash("123")
# Integers
codeflash_output = auth_service.verify_password(123, hashed)
# None
codeflash_output = auth_service.verify_password(None, hashed)
# List
codeflash_output = auth_service.verify_password(['1','2','3'], hashed)

def test_verify_password_hash_for_different_password(auth_service):
"""Test using hash for one password with a different password."""
pwd1 = "first"
pwd2 = "second"
hashed1 = auth_service.settings.auth_settings.pwd_context.hash(pwd1)
hashed2 = auth_service.settings.auth_settings.pwd_context.hash(pwd2)
codeflash_output = auth_service.verify_password(pwd2, hashed1)
codeflash_output = auth_service.verify_password(pwd1, hashed2)

-------------------------

3. LARGE SCALE TEST CASES

-------------------------

def test_verify_password_many_passwords(auth_service):
"""Test verifying a large number of passwords (scalability)."""
# Generate 500 unique passwords and hashes
passwords = [f"userpassword{i}" for i in range(500)]
hashes = [auth_service.settings.auth_settings.pwd_context.hash(p) for p in passwords]
# All should verify with correct password
for p, h in zip(passwords, hashes):
codeflash_output = auth_service.verify_password(p, h)
# All should fail with wrong password
for i, (p, h) in enumerate(zip(passwords, hashes)):
wrong_p = passwords[(i+1)%len(passwords)]
codeflash_output = auth_service.verify_password(wrong_p, h)

def test_verify_password_performance_large_password(auth_service):
"""Test performance with a single very large password (near 1000 chars)."""
pwd = "x" * 999
hashed = auth_service.settings.auth_settings.pwd_context.hash(pwd)
codeflash_output = auth_service.verify_password(pwd, hashed)
# Slightly wrong password
codeflash_output = auth_service.verify_password(pwd[:-1], hashed)

def test_verify_password_bulk_wrong_hashes(auth_service):
"""Test all passwords with all mismatched hashes (should all fail except diagonal)."""
passwords = [f"pw{i}" for i in range(20)]
hashes = [auth_service.settings.auth_settings.pwd_context.hash(p) for p in passwords]
# Only correct password/hash pairs should pass
for i in range(len(passwords)):
for j in range(len(hashes)):
if i == j:
codeflash_output = auth_service.verify_password(passwords[i], hashes[j])
else:
codeflash_output = auth_service.verify_password(passwords[i], hashes[j])

-------------------------

4. ADDITIONAL EDGE CASES

-------------------------

def test_verify_password_hash_reuse(auth_service):
"""Test that reusing a hash for the same password always works."""
pwd = "reused"
hashed = auth_service.settings.auth_settings.pwd_context.hash(pwd)
for _ in range(10):
codeflash_output = auth_service.verify_password(pwd, hashed)

def test_verify_password_mutation_resistance(auth_service):
"""Mutation test: verify that any change to the verify logic breaks tests."""
# This test is a meta-test: if the logic is changed to e.g. always return True/False, most tests fail.
pwd = "mutation"
hashed = auth_service.settings.auth_settings.pwd_context.hash(pwd)
codeflash_output = auth_service.verify_password(pwd, hashed)
codeflash_output = auth_service.verify_password(pwd + "x", hashed)
codeflash_output = auth_service.verify_password("", hashed)

codeflash_output is used to check that the output of the original code is the same as that of the optimized code.

To edit these changes git checkout codeflash/optimize-pr10702-2025-11-24T15.26.47 and push.

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[codecov]

Codecov Report

❌ Patch coverage is 86.02151% with 39 lines in your changes missing coverage. Please review.
✅ Project coverage is 30.86%. Comparing base (1d16a2e) to head (c577b98).
⚠️ Report is 447 commits behind head on main.

Files with missing lines	Patch %	Lines
src/lfx/src/lfx/services/manager.py	86.36%	13 Missing and 8 partials ⚠️
src/lfx/src/lfx/services/tracing/service.py	75.00%	7 Missing ⚠️
src/lfx/src/lfx/services/telemetry/service.py	81.81%	6 Missing ⚠️
src/lfx/src/lfx/services/registry.py	76.47%	4 Missing ⚠️
src/lfx/src/lfx/services/variable/service.py	96.55%	0 Missing and 1 partial ⚠️

❌ Your project status has failed because the head coverage (40.37%) 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   #10703      +/-   ##
==========================================
+ Coverage   30.64%   30.86%   +0.21%     
==========================================
  Files        1318     1323       +5     
  Lines       59710    59670      -40     
  Branches     8926     8959      +33     
==========================================
+ Hits        18298    18415     +117     
+ Misses      40565    40392     -173     
- Partials      847      863      +16     

Flag	Coverage Δ
lfx	40.37% <86.02%> (+0.96%)	⬆️

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/__main__.py	55.25% <ø> (-0.19%)	⬇️
src/backend/base/langflow/services/auth/factory.py	88.88% <ø> (-1.12%)	⬇️
...kend/base/langflow/services/auth/mcp_encryption.py	80.39% <ø> (-2.66%)	⬇️
src/backend/base/langflow/services/auth/service.py	75.00% <ø> (-10.72%)	⬇️
src/backend/base/langflow/services/auth/utils.py	88.23% <ø> (+30.59%)	⬆️
src/backend/base/langflow/services/deps.py	86.95% <ø> (ø)
src/lfx/src/lfx/services/schema.py	100.00% <100.00%> (ø)
src/lfx/src/lfx/services/storage/local.py	65.00% <100.00%> (+50.52%)	⬆️
src/lfx/src/lfx/services/telemetry/base.py	100.00% <100.00%> (ø)
src/lfx/src/lfx/services/tracing/base.py	100.00% <100.00%> (ø)
... and 5 more

... and 6 files with indirect coverage changes

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[ogabrielluiz]

Closing automated codeflash PR.