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feat: add load testing infrastructure with Locust #164

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feat: add load testing infrastructure with Locust
aanyacloud Jun 12, 2026
6a6442e
Merge branch 'main' into issue-131-load-testing
S3DFX-CYBER Jun 15, 2026
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3 changes: 2 additions & 1 deletion requirements-dev.txt
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Original file line number Diff line number Diff line change
Expand Up @@ -27,4 +27,5 @@ watchdog>=6.0.0

# Type Stubs
types-requests>=2.31.0
types-redis>=4.6.0.20241004
types-redis>=4.6.0.20241004
locust>=2.31.0
58 changes: 58 additions & 0 deletions tests/load/README.md
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@@ -0,0 +1,58 @@
# TENET AI Load Testing

## Overview

This directory contains load testing scripts for TENET AI APIs using Locust.

## Tested Endpoints

- GET /health
- GET /v1/stats
- GET /v1/events
- POST /v1/events/llm

## Installation

```bash
pip install locust
```

## Running Tests

```bash
locust -f tests/load/locustfile.py
```

Then open:

http://localhost:8089
Comment on lines +20 to +28

@coderabbitai coderabbitai Bot Jun 12, 2026

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⚠️ Potential issue | 🟠 Major | ⚡ Quick win

Document required host configuration and API key setup.

The running instructions omit critical setup details: users must specify the target host URL via --host and ensure a valid API key is configured. Without these, the load tests will fail.

📝 Suggested documentation addition 
 ## Running Tests
 
+### Prerequisites
+
+1. Ensure the TENET AI ingest service is running
+2. Configure a valid API key with `ingest` and `read` permissions (see Authentication section below)
+
+### Execute
+
 ```bash
-locust -f tests/load/locustfile.py
+locust -f tests/load/locustfile.py --host=http://localhost:8000

Then open:

http://localhost:8089
+
+### Authentication
+
+Update the API_KEY constant in locustfile.py with a valid test API key that has:
+- ingest permission for POST /v1/events/llm
+- read permission for GET /v1/stats and GET /v1/events

</details>

<details>
<summary>🤖 Prompt for AI Agents</summary>

Verify each finding against current code. Fix only still-valid issues, skip the
rest with a brief reason, keep changes minimal, and validate.

In @tests/load/README.md around lines 20 - 28, Update the tests/load/README.md
to include required host and auth setup: instruct users to pass --host (example:
--host=http://localhost:8000) when running locust with tests/load/locustfile.py
and add an "Authentication" section telling them to set the API_KEY constant in
locustfile.py to a valid test API key with the needed permissions (ingest for
POST /v1/events/llm and read for GET /v1/stats and GET /v1/events); reference
locustfile.py and the API_KEY constant so it's clear where to configure these
values.


</details>

<!-- fingerprinting:phantom:poseidon:puma -->

<!-- cr-comment:v1:fc7fe9e7eef0cf670bb72c46 -->

<!-- This is an auto-generated comment by CodeRabbit -->


## Test Scenarios

### Sustained Load Test

- Target: 100 requests/second
- Duration: 10 minutes

### Spike Load Test

- Simulate sudden bursts of traffic
- Increase users rapidly

### Concurrent Connection Test

- Run multiple concurrent users
- Observe latency and error rates

## Metrics to Measure

- P50 latency
- P95 latency
- P99 latency
- Throughput
- Error rate

## Acceptance Criteria

- P95 latency < 500 ms under sustained load
- Error rate < 0.1% under normal load
56 changes: 56 additions & 0 deletions tests/load/locustfile.py
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from locust import HttpUser, task, between

API_KEY = "test-api-key"

@coderabbitai coderabbitai Bot Jun 12, 2026

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⚠️ Potential issue | 🟠 Major | ⚡ Quick win

Replace hardcoded API key with environment variable.

The hardcoded test-api-key constant poses security and configuration risks: it may be committed to version control and cannot be changed per environment without modifying code. From the relevant code snippets (services/ingest/app.py), the API requires valid authenticated keys with specific permissions (ingest for POST /v1/events/llm, read for GET endpoints).

🔐 Proposed fix using environment variable 
+import os
 from locust import HttpUser, task, between
 
-API_KEY = "test-api-key"
+API_KEY = os.getenv("TENET_LOAD_TEST_API_KEY", "test-api-key")

Then document in README.md:

export TENET_LOAD_TEST_API_KEY="your-valid-test-key"
locust -f tests/load/locustfile.py --host=http://localhost:8000
📝 Committable suggestion

‼️ IMPORTANT
Carefully review the code before committing. Ensure that it accurately replaces the highlighted code, contains no missing lines, and has no issues with indentation. Thoroughly test & benchmark the code to ensure it meets the requirements.

Suggested change
API_KEY = "test-api-key"
import os
from locust import HttpUser, task, between
API_KEY = os.getenv("TENET_LOAD_TEST_API_KEY", "test-api-key")
🤖 Prompt for AI Agents 
Verify each finding against current code. Fix only still-valid issues, skip the
rest with a brief reason, keep changes minimal, and validate.

In `@tests/load/locustfile.py` at line 3, Replace the hardcoded API_KEY constant
in tests/load/locustfile.py with a value read from an environment variable
(e.g., TENET_LOAD_TEST_API_KEY); update the code that references API_KEY so it
raises a clear error or exits if the env var is missing, and ensure any locust
task functions (where API_KEY is used) continue to reference the same symbol
(API_KEY) so no other changes are required; also add a brief README note or
comment showing how to export TENET_LOAD_TEST_API_KEY before running locust.

@cubic-dev-ai cubic-dev-ai Bot Jun 12, 2026

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P1: Hardcoding test-api-key here makes the load test brittle and likely unauthorized under the project’s expected API-key configuration, so the script may only measure 401/403 responses instead of actual ingest performance.

Prompt for AI agents 
Check if this issue is valid — if so, understand the root cause and fix it. At tests/load/locustfile.py, line 3:

<comment>Hardcoding `test-api-key` here makes the load test brittle and likely unauthorized under the project’s expected API-key configuration, so the script may only measure 401/403 responses instead of actual ingest performance.</comment>

<file context>
@@ -0,0 +1,56 @@
+from locust import HttpUser, task, between
+
+API_KEY = "test-api-key"
+
+
</file context>



class TENETLoadUser(HttpUser):
wait_time = between(1, 3)

headers = {
"x-api-key": API_KEY,
"Content-Type": "application/json",
}
Comment on lines +9 to +12

@coderabbitai coderabbitai Bot Jun 12, 2026

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⚠️ Potential issue | 🟠 Major | ⚡ Quick win

Convert mutable class attribute to property or instance attribute.

Ruff correctly flags that defining headers as a mutable dict at class level means all instances share the same dict object. If any task modifies self.headers, it affects all concurrent users.

🛡️ Recommended fix using on_start 
-    headers = {
-        "x-api-key": API_KEY,
-        "Content-Type": "application/json",
-    }
+
+    def on_start(self):
+        """Initialize headers per user instance."""
+        self.headers = {
+            "x-api-key": API_KEY,
+            "Content-Type": "application/json",
+        }
📝 Committable suggestion

‼️ IMPORTANT
Carefully review the code before committing. Ensure that it accurately replaces the highlighted code, contains no missing lines, and has no issues with indentation. Thoroughly test & benchmark the code to ensure it meets the requirements.

Suggested change
headers = {
"x-api-key": API_KEY,
"Content-Type": "application/json",
}
def on_start(self):
"""Initialize headers per user instance."""
self.headers = {
"x-api-key": API_KEY,
"Content-Type": "application/json",
}
🧰 Tools
🪛 Ruff (0.15.15)

[warning] 9-12: Mutable default value for class attribute

(RUF012)

🤖 Prompt for AI Agents 
Verify each finding against current code. Fix only still-valid issues, skip the
rest with a brief reason, keep changes minimal, and validate.

In `@tests/load/locustfile.py` around lines 9 - 12, The class-level mutable dict
headers should be converted to an instance attribute or property to avoid
sharing it across Locust users; update the Locust user class (where headers is
declared) to initialize self.headers in an on_start method (or implement a
`@property` that returns a fresh dict) using API_KEY and "Content-Type":
"application/json", and update any references from headers to self.headers so
each user gets its own dict instance and concurrent modifications won't affect
other users.

Source: Linters/SAST tools


@task(3)
def health_check(self):
self.client.get(
"/health",
headers=self.headers,
name="GET /health"
)

@task(2)
def get_stats(self):
self.client.get(
"/v1/stats",
headers=self.headers,
name="GET /v1/stats"
)

@task(2)
def list_events(self):
self.client.get(
"/v1/events",
headers=self.headers,
name="GET /v1/events"
)
Comment on lines +22 to +36

@coderabbitai coderabbitai Bot Jun 12, 2026

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⚠️ Potential issue | 🟠 Major | ⚡ Quick win

Add response validation and error handling to authenticated endpoints.

The get_stats and list_events tasks don't validate response status codes or catch exceptions. For load testing, tracking success/failure rates is essential to meet the acceptance criteria (error rate < 0.1%).

✅ Proposed enhancement with response validation 
     `@task`(2)
     def get_stats(self):
-        self.client.get(
+        with self.client.get(
             "/v1/stats",
             headers=self.headers,
-            name="GET /v1/stats"
-        )
+            name="GET /v1/stats",
+            catch_response=True
+        ) as response:
+            if response.status_code != 200:
+                response.failure(f"Got status code {response.status_code}")
+            elif "total_events" not in response.json():
+                response.failure("Missing expected field: total_events")
+            else:
+                response.success()
 
     `@task`(2)
     def list_events(self):
-        self.client.get(
+        with self.client.get(
             "/v1/events",
             headers=self.headers,
-            name="GET /v1/events"
-        )
+            name="GET /v1/events",
+            catch_response=True
+        ) as response:
+            if response.status_code != 200:
+                response.failure(f"Got status code {response.status_code}")
+            elif "events" not in response.json():
+                response.failure("Missing expected field: events")
+            else:
+                response.success()
🤖 Prompt for AI Agents 
Verify each finding against current code. Fix only still-valid issues, skip the
rest with a brief reason, keep changes minimal, and validate.

In `@tests/load/locustfile.py` around lines 22 - 36, Wrap the GET calls in
get_stats and list_events with client.get(..., catch_response=True) and validate
the response inside that context: check resp.status_code (expect 200) and call
resp.success() on valid responses or resp.failure(...) with an informative
message on non-200 or unexpected body; also catch exceptions around the request
and call resp.failure(...) (or mark failure) so Locust records errors for those
authenticated endpoints (functions get_stats and list_events, and the
self.client.get calls using self.headers).


@task(1)
def submit_llm_event(self):
payload = {
"source_type": "chat",
"source_id": "load-test-user",
"model": "gpt-4",
"prompt": "This is a load testing request",
"system_prompt": "You are a helpful assistant",
"metadata": {
"environment": "load-test"
}
}

self.client.post(
"/v1/events/llm",
json=payload,
headers=self.headers,
name="POST /v1/events/llm"
)
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