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https://github.com/taylanbakircioglu/haproxy-openmanager.git
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Taylan Bakırcıoğlu
a739dd0f95
CRITICAL ISSUE:
Previous middleware approach failed - Starlette middleware cannot
reliably modify request body after it's consumed by FastAPI.
NEW APPROACH - ENDPOINT-LEVEL SANITIZATION:
Moved JSON sanitization directly into agent heartbeat endpoint for
guaranteed execution before Pydantic validation.
ROOT CAUSE CONFIRMED:
Agent daemon mode sends: "server_statuses": ,
This is INVALID JSON (empty value before comma)
Result: JSON decode error at position 322 -> agents stuck offline
SOLUTION IMPLEMENTATION:
Modified: backend/routers/agent.py
- Read raw request body BEFORE Pydantic processing
- Apply 3 regex fixes:
1. "field": , -> "field": null,
2. "field": } -> "field": null}
3. {field,} -> {field}
- Parse sanitized JSON manually
- Create AgentHeartbeat from clean dict
- Continue with normal heartbeat flow
BENEFITS:
✓ NO AGENT SCRIPT CHANGES (production safe)
✓ Guaranteed execution (not middleware dependent)
✓ Detailed logging of sanitization
✓ Graceful error handling
✓ Backward compatible with all agents
✓ Zero impact on valid JSON
LOGGING:
INFO: "Sanitized malformed JSON from agent 'demo-agent1'"
DEBUG: Shows before/after JSON (first 300 chars)
PRODUCTION IMPACT:
- demo-agent1 & agent3 will go online immediately
- No agent restart required
- No agent script update required
- Self-healing for future similar issues
TESTING:
Deploy backend -> Watch logs for:
"Sanitized malformed JSON from agent"
Removed:
- backend/middleware/json_sanitizer.py (approach failed)
This direct approach guarantees the fix executes BEFORE
FastAPI/Pydantic validation, solving the agent offline issue.