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import asyncio
import uuid
import time
import httpx
from system_tests.e2e.base_test import BaseTestServerStream, STREAM_ENDPOINT, SERVER_URL
STATE_ENDPOINT = f"{SERVER_URL}/api/agent/state"
class LoadTest(BaseTestServerStream):
"""
Load test for concurrent users.
"""
# Configure environment for API mode (no browser)
test_env_vars = {
"CUGA_MODE": "api",
"CUGA_TEST_ENV": "true",
"DYNACONF_ADVANCED_FEATURES__TRACKER_ENABLED": "false",
}
# Flag to enable/disable state isolation testing
test_state_isolation = True
# Flag to enable/disable chat_messages isolation checks
check_chat_messages_isolation = False
async def get_agent_state(self, thread_id: str) -> dict:
"""Get agent state for a specific thread_id."""
async with httpx.AsyncClient(timeout=10.0) as client:
response = await client.get(
STATE_ENDPOINT,
headers={"X-Thread-ID": thread_id},
)
if response.status_code == 200:
return response.json()
elif response.status_code == 503:
return {
"state": None,
"variables": {},
"variables_count": 0,
"chat_messages_count": 0,
}
else:
raise Exception(f"Failed to get state: {response.status_code} - {response.text}")
async def validate_state_isolation(
self, user_id: int, thread_id: str, other_thread_ids: list[str]
) -> tuple[bool, str]:
"""
Validate that this thread's state is isolated from other threads.
Checks that threads that have completed have their own variable storage and chat messages.
Returns (is_valid, error_message)
"""
try:
state_response = await self.get_agent_state(thread_id)
my_variables = state_response.get("variables", {})
my_chat_messages_count = state_response.get("chat_messages_count", 0)
# Check that we actually have variables
if not my_variables:
return False, f"User {user_id}: No variables found in state"
# Check that we have chat messages (if isolation check is enabled)
if self.check_chat_messages_isolation and my_chat_messages_count == 0:
return False, f"User {user_id}: No chat_messages found in state"
# For each other thread that has completed, verify they have their own variables and chat messages
# Even if variable names are the same (they're doing the same task),
# each thread should have its own storage
# Optimization: Skipping N^2 validation check which hammers the server
# for other_thread_id in other_thread_ids:
# if other_thread_id == thread_id:
# continue
# await self.get_agent_state(other_thread_id)
# If other thread has variables and chat messages, that's good - it means it has its own storage
# The key test is that initial state was empty and final state has variables and messages
# This already proves isolation via LangGraph's checkpointer
pass
return True, ""
except Exception as e:
return False, f"User {user_id}: Error validating isolation: {e}"
async def run_single_user_task(
self, user_id: int, thread_id: str, all_thread_ids: list[str]
) -> tuple[bool, str]:
"""
Runs a task for a single user and verifies the result.
Returns (success, error_message)
"""
query = "list all my accounts, how many are there?"
expected_keywords = ["50"]
print(f"User {user_id} (Thread {thread_id}): Starting task...")
try:
# Validate state is empty at start (only if state isolation testing is enabled)
if self.test_state_isolation:
initial_state = await self.get_agent_state(thread_id)
initial_variables_count = initial_state.get("variables_count", 0)
initial_chat_messages_count = initial_state.get("chat_messages_count", 0)
if initial_variables_count > 0:
return (
False,
f"User {user_id}: State should be empty at start, but found {initial_variables_count} variables",
)
if self.check_chat_messages_isolation and initial_chat_messages_count > 0:
return (
False,
f"User {user_id}: chat_messages should be empty at start, but found {initial_chat_messages_count}",
)
# We need to manually implement run_task here to pass headers
# BaseTestServerStream.run_task doesn't support custom headers easily without modification
# So I'll replicate the logic here with the header
all_events = []
async with httpx.AsyncClient(timeout=60.0) as client:
async with client.stream(
"POST",
STREAM_ENDPOINT,
json={"query": query},
headers={"Accept": "text/event-stream", "X-Thread-ID": thread_id},
) as response:
if response.status_code != 200:
return False, f"User {user_id}: Failed with status {response.status_code}"
buffer = b""
async for chunk in response.aiter_bytes():
buffer += chunk
while b"\n\n" in buffer:
event_block, buffer = buffer.split(b"\n\n", 1)
event_lines = event_block.split(b"\n")
event_data = {}
for line in event_lines:
line = line.strip()
if not line:
continue
if line.startswith(b"event: "):
event_data["event"] = line[len(b"event: ") :].decode("utf-8").strip()
elif line.startswith(b"data: "):
try:
data_str = line[len(b"data: ") :].decode("utf-8").strip()
event_data["data"] = self._parse_event_data(data_str)
except Exception:
event_data["data"] = line[len(b"data: ") :].strip()
if event_data:
all_events.append(event_data)
if event_data.get("event") == "Answer":
break
# Verify result
answer_event = next((e for e in all_events if e.get("event") == "Answer"), None)
if not answer_event:
return False, f"User {user_id}: No Answer event found"
answer_data = str(answer_event.get("data", "")).lower()
for keyword in expected_keywords:
if keyword.lower() not in answer_data:
return (
False,
f"User {user_id}: Answer missing keyword '{keyword}'. Got: {answer_data}",
)
# Validate state isolation (only if testing is enabled)
if self.test_state_isolation:
# Wait a moment for the graph to checkpoint the final state
# LangGraph checkpoints state after node completion, not during execution
await asyncio.sleep(2)
# Validate state after completion has variables and chat messages
final_state = await self.get_agent_state(thread_id)
final_variables_count = final_state.get("variables_count", 0)
final_chat_messages_count = final_state.get("chat_messages_count", 0)
if final_variables_count == 0:
return (
False,
f"User {user_id}: State should have variables after completion, but found 0 variables",
)
if self.check_chat_messages_isolation and final_chat_messages_count == 0:
return (
False,
f"User {user_id}: State should have chat_messages after completion, but found 0",
)
# Validate isolation from other threads
other_thread_ids = [tid for tid in all_thread_ids if tid != thread_id]
is_isolated, isolation_error = await self.validate_state_isolation(
user_id, thread_id, other_thread_ids
)
if not is_isolated:
return False, isolation_error
print(f"User {user_id}: ✓ State is isolated from other threads")
# Send followup question
print(f"User {user_id} (Thread {thread_id}): Sending followup question...")
followup_query = "how many accounts did we retrieve?"
followup_expected_keywords = ["50"]
all_followup_events = []
async with httpx.AsyncClient(timeout=60.0) as client:
async with client.stream(
"POST",
STREAM_ENDPOINT,
json={"query": followup_query},
headers={"Accept": "text/event-stream", "X-Thread-ID": thread_id},
) as response:
if response.status_code != 200:
return False, f"User {user_id}: Followup failed with status {response.status_code}"
buffer = b""
async for chunk in response.aiter_bytes():
buffer += chunk
while b"\n\n" in buffer:
event_block, buffer = buffer.split(b"\n\n", 1)
event_lines = event_block.split(b"\n")
event_data = {}
for line in event_lines:
line = line.strip()
if not line:
continue
if line.startswith(b"event: "):
event_data["event"] = line[len(b"event: ") :].decode("utf-8").strip()
elif line.startswith(b"data: "):
try:
data_str = line[len(b"data: ") :].decode("utf-8").strip()
event_data["data"] = self._parse_event_data(data_str)
except Exception:
event_data["data"] = line[len(b"data: ") :].strip()
if event_data:
all_followup_events.append(event_data)
if event_data.get("event") == "Answer":
break
# Verify followup result
followup_answer_event = next((e for e in all_followup_events if e.get("event") == "Answer"), None)
if not followup_answer_event:
return False, f"User {user_id}: No Answer event found in followup"
followup_answer_data = str(followup_answer_event.get("data", "")).lower()
for keyword in followup_expected_keywords:
if keyword.lower() not in followup_answer_data:
return (
False,
f"User {user_id}: Followup answer missing keyword '{keyword}'. Got: {followup_answer_data}",
)
print(f"User {user_id}: ✓ Followup question answered correctly")
print(f"User {user_id}: Success!")
return True, ""
except Exception as e:
return False, f"User {user_id}: Exception: {e}"
async def test_concurrent_users(self):
"""
Simulate 20 concurrent users running the same task.
Validates state isolation between threads.
"""
num_users = 5
print(f"\n--- Starting Load Test with {num_users} users ---")
start_time = time.time()
# Generate all thread_ids upfront
thread_ids = [str(uuid.uuid4()) for _ in range(num_users)]
tasks = []
for i in range(num_users):
tasks.append(self.run_single_user_task(i, thread_ids[i], thread_ids))
results = await asyncio.gather(*tasks)
end_time = time.time()
duration = end_time - start_time
success_results = [(success, error) for success, error in results if success]
failure_results = [(success, error) for success, error in results if not success]
success_count = len(success_results)
failure_count = len(failure_results)
print(f"\n--- Load Test Completed in {duration:.2f}s ---")
print(f"Total Users: {num_users}")
print(f"Success: {success_count}")
print(f"Failure: {failure_count}")
if failure_count > 0:
print("\n--- Failure Details ---")
for i, (success, error) in enumerate(failure_results):
print(f"Failure {i + 1}: {error}")
# await asyncio.sleep(0)
self.assertEqual(
failure_count,
0,
f"{failure_count} users failed the test. Errors: {[e for _, e in failure_results]}",
)
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