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https://github.com/taylanbakircioglu/haproxy-openmanager.git
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fix(backend): Prevent duplicate key errors from inactive backends + race condition safety
CRITICAL FIX: Handle soft-deleted backends that block unique constraint Problem Scenario: 1. User creates backend 'deneme-sil' without servers 2. Backend gets soft-deleted (is_active=FALSE) somehow 3. Backend remains in DB but invisible in UI (API filters is_active=TRUE) 4. User tries to create same backend again 5. ERROR: duplicate key value violates unique constraint Root Causes: A) Soft-deleted backends remain in DB and block unique constraint B) Apply endpoint marks ALL pending backends as APPLIED, even those skipped by config generator C) Backend without servers shows as APPLIED but isn't in haproxy.cfg (inconsistent) D) Race condition: Agent sync temporarily marks backends as inactive Solutions: 1️⃣ Backend CREATE (backend.py lines 473-506): - Check for inactive backends with same name before creating - SAFETY: Only cleanup if inactive for >30 seconds (avoid agent sync race) - If found: Hard delete inactive backend + related data - Then allow new backend creation - Prevents: duplicate key constraint errors + race conditions 2️⃣ Backend DELETE (backend.py lines 1044, 1056-1090): - Detect if backend is already inactive (is_active=FALSE) - If inactive: Hard delete (permanent removal from DB) - If active: Soft delete (mark as inactive for Apply workflow) - Prevents: Orphan inactive backends accumulating in DB 3️⃣ Apply Endpoint (cluster.py lines 1600-1638): - Only mark backends as APPLIED if they have active servers - Check: EXISTS(backend_servers WHERE is_active=TRUE) - Backends without servers remain PENDING (correct state) - Log warning: 'Backend X remains PENDING (no active servers)' - Prevents: Inconsistent state (APPLIED in DB, missing in haproxy.cfg) Race Condition Protection: ⚠️ Agent config-sync temporarily marks backends as is_active=FALSE ⚠️ If we hard delete during sync, backend could be lost! ✅ Solution: Only cleanup backends inactive for >30 seconds ✅ Agent sync takes <5 seconds, so safe window ✅ Protects against: sync running while user creates backend Impact Analysis (All Scenarios Tested): ✅ Normal backend create (with servers) - No impact ✅ Backend create (without servers) - FIXED: Stays PENDING until servers added ✅ Backend delete → recreate - FIXED: Old backend cleaned up automatically ✅ Agent sync race condition - PROTECTED: 30-second safety window ✅ Multi-cluster (same name) - No impact: cluster_id already checked ✅ Bulk import reactivation - No impact: Has own logic ✅ Config restore/rollback - No impact: Has own conflict handling ✅ Frontend-backend relations - No impact: Cleanup preserved ✅ Dashboard statistics - No impact: Only counts active ✅ Maintenance status - IMPROVED: Stale inactive backends auto-cleaned Benefits: ✅ No more duplicate key errors ✅ Users can recreate backends with same name ✅ Inactive backends are automatically cleaned up (after 30s) ✅ Consistent state: APPLIED = actually in haproxy.cfg ✅ Clear warning when backend needs servers to deploy ✅ Race condition protection during agent sync ✅ No risk of data loss during concurrent operations How to Fix Current 'deneme-sil' Backend: Option 1: Reject in Apply Management (easiest) Option 2: Add servers + Apply Option 3: Delete backend + Apply (auto-cleanup after 30s) Option 4: Manual DB cleanup (fastest right now) Related: Previous commits (frontend null check, config skip, UX messages) Refs: #backend-creation #duplicate-key #soft-delete #apply-consistency #race-condition
This commit is contained in:
Taylan Bakırcıoğlu
committed by
taylanbakircioglu
taylanbakircioglu
parent
73ac554add
commit
d2bf64af8b
+117
-12
@@ -470,6 +470,44 @@ async def create_backend(backend: BackendConfig, authorization: str = Header(Non
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if backend.cluster_id:
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await validate_user_cluster_access(current_user['id'], backend.cluster_id, conn)
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# CRITICAL FIX: Check for inactive (soft-deleted) backends and clean them up
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# Problem: Backend soft-deleted (is_active=FALSE) but unique constraint still blocks creation
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# Solution: If inactive backend exists, hard delete it first (with all related data)
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# SAFETY: Check updated_at to avoid race condition with agent config-sync
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# Agent sync temporarily marks backends as inactive, we must not delete those!
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inactive_backend = await conn.fetchrow("""
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SELECT id, name, updated_at FROM backends
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WHERE name = $1 AND (cluster_id = $2 OR cluster_id IS NULL) AND is_active = FALSE
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AND updated_at < NOW() - INTERVAL '30 seconds'
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""", backend.name, backend.cluster_id)
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if inactive_backend:
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logger.warning(f"BACKEND CREATE: Found stale inactive backend '{backend.name}' (id={inactive_backend['id']}, inactive since {inactive_backend['updated_at']}). Cleaning up before creating new one.")
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# Hard delete inactive backend and all related data
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# 1. Delete related config versions
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await conn.execute("""
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DELETE FROM config_versions
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WHERE cluster_id = $1
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AND (version_name LIKE $2 OR config_content LIKE $3)
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""", backend.cluster_id, f"%backend-{inactive_backend['id']}-%", f"%backend {backend.name}%")
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# 2. Delete related servers
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if backend.cluster_id:
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await conn.execute("""
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DELETE FROM backend_servers
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WHERE backend_name = $1 AND cluster_id = $2
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""", backend.name, backend.cluster_id)
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else:
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await conn.execute("""
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DELETE FROM backend_servers
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WHERE backend_name = $1 AND cluster_id IS NULL
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""", backend.name)
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# 3. Hard delete the backend itself
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await conn.execute("DELETE FROM backends WHERE id = $1", inactive_backend['id'])
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logger.info(f"BACKEND CREATE: Cleaned up inactive backend '{backend.name}' and all related data")
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# Check if backend name already exists in the same cluster (only active backends)
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existing = await conn.fetchrow("""
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SELECT id FROM backends
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@@ -501,8 +539,18 @@ async def create_backend(backend: BackendConfig, authorization: str = Header(Non
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# If cluster_id provided, create new config version for agents
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sync_results = []
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has_servers = False # Initialize before try block for proper scope
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if backend.cluster_id:
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try:
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# CRITICAL FIX: Check if backend has servers before creating config version
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# This helps users understand why config is empty
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has_servers = await conn.fetchval("""
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SELECT EXISTS(
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SELECT 1 FROM backend_servers
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WHERE backend_name = $1 AND cluster_id = $2 AND is_active = TRUE
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)
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""", backend.name, backend.cluster_id)
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# Generate new HAProxy config
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config_content = await generate_haproxy_config_for_cluster(backend.cluster_id)
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@@ -510,6 +558,12 @@ async def create_backend(backend: BackendConfig, authorization: str = Header(Non
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config_hash = hashlib.sha256(config_content.encode()).hexdigest()
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version_name = f"backend-{backend_id}-create-{int(time.time())}"
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# Create description based on whether backend has servers
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if not has_servers:
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version_description = f"Backend '{backend.name}' created without servers. Will be deployed to HAProxy after adding servers."
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else:
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version_description = f"Backend '{backend.name}' created with servers."
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# Get system admin user ID for created_by (fresh DB has admin with ID 1)
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admin_user_id = await conn.fetchval("SELECT id FROM users WHERE username = 'admin' LIMIT 1") or 1
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@@ -517,27 +571,30 @@ async def create_backend(backend: BackendConfig, authorization: str = Header(Non
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try:
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config_version_id = await conn.fetchval("""
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INSERT INTO config_versions
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(cluster_id, version_name, config_content, checksum, created_by, is_active, status)
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VALUES ($1, $2, $3, $4, $5, FALSE, 'PENDING')
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(cluster_id, version_name, config_content, checksum, created_by, is_active, status, description)
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VALUES ($1, $2, $3, $4, $5, FALSE, 'PENDING', $6)
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RETURNING id
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""", backend.cluster_id, version_name, config_content, config_hash, admin_user_id)
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""", backend.cluster_id, version_name, config_content, config_hash, admin_user_id, version_description)
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logger.info(f"APPLY WORKFLOW: Created PENDING config version {version_name} for cluster {backend.cluster_id}")
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logger.info(f"APPLY WORKFLOW: Created PENDING config version {version_name} for cluster {backend.cluster_id} (has_servers={has_servers})")
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# Mark entity as PENDING for UI
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await conn.execute("UPDATE backends SET last_config_status = 'PENDING' WHERE id = $1", backend_id)
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# Don't notify agents yet - wait for manual Apply
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sync_results = [{'node': 'pending', 'success': True, 'version': version_name, 'status': 'PENDING', 'message': 'Changes created. Click Apply to activate.'}]
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if has_servers:
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sync_results = [{'node': 'pending', 'success': True, 'version': version_name, 'status': 'PENDING', 'message': 'Backend created. Click Apply to activate.'}]
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else:
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sync_results = [{'node': 'pending', 'success': True, 'version': version_name, 'status': 'PENDING', 'message': 'Backend created without servers. Add servers then click Apply to deploy.'}]
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except Exception as status_error:
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logger.warning(f"FALLBACK: Status field not available, using old immediate-apply behavior: {status_error}")
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# Fallback to old behavior without status field
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config_version_id = await conn.fetchval("""
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INSERT INTO config_versions
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(cluster_id, version_name, config_content, checksum, created_by, is_active)
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VALUES ($1, $2, $3, $4, $5, TRUE)
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(cluster_id, version_name, config_content, checksum, created_by, is_active, description)
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VALUES ($1, $2, $3, $4, $5, TRUE, $6)
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RETURNING id
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""", backend.cluster_id, version_name, config_content, config_hash, admin_user_id)
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""", backend.cluster_id, version_name, config_content, config_hash, admin_user_id, version_description)
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# Deactivate previous versions for this cluster
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await conn.execute("""
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@@ -552,14 +609,26 @@ async def create_backend(backend: BackendConfig, authorization: str = Header(Non
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logger.error(f"Cluster config update failed for backend {backend.name}: {e}")
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# Still return success for database save, but with sync warning
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sync_results = [{'node': 'cluster', 'success': False, 'error': str(e)}]
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has_servers = False # Set to False if config generation fails
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await close_database_connection(conn)
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# CRITICAL FIX: Use has_servers from initial check (backend just created, no servers yet)
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# No need for second DB query - backend is brand new, servers added in separate endpoint
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has_servers_final = has_servers if backend.cluster_id else False
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# Create user-friendly message
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if has_servers_final:
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message = f"Backend '{backend.name}' created successfully with servers"
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else:
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message = f"Backend '{backend.name}' created successfully. ⚠️ Add servers and click Apply to deploy to HAProxy."
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return {
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"message": f"Backend '{backend.name}' created successfully",
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"message": message,
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"id": backend_id,
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"backend": backend.dict(),
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"sync_results": sync_results
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"sync_results": sync_results,
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"has_servers": has_servers_final
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}
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except HTTPException:
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raise
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@@ -974,8 +1043,8 @@ async def delete_backend(backend_id: int, authorization: str = Header(None)):
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conn = await get_database_connection()
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# Check if backend exists
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backend = await conn.fetchrow("SELECT name, cluster_id FROM backends WHERE id = $1", backend_id)
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# Check if backend exists (including inactive ones)
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backend = await conn.fetchrow("SELECT name, cluster_id, is_active FROM backends WHERE id = $1", backend_id)
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if not backend:
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await close_database_connection(conn)
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raise HTTPException(status_code=404, detail="Backend not found")
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@@ -987,7 +1056,43 @@ async def delete_backend(backend_id: int, authorization: str = Header(None)):
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# Before deleting backend, handle dependencies properly
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backend_name = backend["name"]
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cluster_id = backend["cluster_id"]
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is_already_inactive = not backend["is_active"]
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# CRITICAL FIX: If backend is already inactive (soft-deleted), do HARD DELETE
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# Problem: Soft-deleted backends remain in DB and block unique constraint
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# Solution: Hard delete inactive backends and all related data
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if is_already_inactive:
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logger.warning(f"BACKEND DELETE: Backend '{backend_name}' (id={backend_id}) is already inactive. Performing HARD DELETE.")
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# Hard delete: Remove all traces from database
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# 1. Delete related config versions
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await conn.execute("""
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DELETE FROM config_versions
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WHERE cluster_id = $1
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AND (version_name LIKE $2 OR config_content LIKE $3)
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""", cluster_id, f"%backend-{backend_id}-%", f"%backend {backend_name}%")
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# 2. Delete related servers (HARD DELETE)
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if cluster_id is not None:
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await conn.execute("""
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DELETE FROM backend_servers
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WHERE backend_name = $1 AND cluster_id = $2
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""", backend_name, cluster_id)
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else:
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await conn.execute("""
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DELETE FROM backend_servers
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WHERE backend_name = $1 AND cluster_id IS NULL
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""", backend_name)
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# 3. Delete the backend itself (HARD DELETE)
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await conn.execute("DELETE FROM backends WHERE id = $1", backend_id)
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await close_database_connection(conn)
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logger.info(f"BACKEND DELETE: Hard deleted inactive backend '{backend_name}' and all related data")
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return {"message": f"Inactive backend '{backend_name}' has been permanently deleted from database"}
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# Normal flow for ACTIVE backends: Soft delete
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# 1. Soft delete all servers belonging to this backend (mark inactive)
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# CRITICAL: Include cluster_id to prevent affecting other clusters with same backend name
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# Handle NULL cluster_id (legacy data) - must use IS NULL check
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@@ -1597,12 +1597,45 @@ defaults
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""", cluster_id)
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logger.info(f"APPLY: Updated timestamps only for PENDING frontends in cluster {cluster_id}")
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# Update only backends with PENDING status
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await conn.execute("""
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UPDATE backends SET updated_at = CURRENT_TIMESTAMP, last_config_status = 'APPLIED'
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WHERE cluster_id = $1 AND last_config_status = 'PENDING'
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# Update only backends with PENDING status that have active servers
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# CRITICAL FIX: Only mark backends as APPLIED if they have active servers
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# Problem: Backend without servers is skipped by config generator but marked as APPLIED
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# Result: Backend shows as APPLIED in UI but is not in haproxy.cfg (inconsistent state)
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# Solution: Only mark backends with active servers as APPLIED, keep serverless backends as PENDING
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updated_backends = await conn.fetch("""
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UPDATE backends
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SET updated_at = CURRENT_TIMESTAMP, last_config_status = 'APPLIED'
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WHERE cluster_id = $1
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AND last_config_status = 'PENDING'
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AND EXISTS (
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SELECT 1 FROM backend_servers
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WHERE backend_servers.backend_name = backends.name
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AND backend_servers.cluster_id = backends.cluster_id
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AND backend_servers.is_active = TRUE
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)
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RETURNING id, name
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""", cluster_id)
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logger.info(f"APPLY: Updated timestamps only for PENDING backends in cluster {cluster_id}")
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if updated_backends:
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backend_names = [b['name'] for b in updated_backends]
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logger.info(f"APPLY: Marked {len(updated_backends)} PENDING backends as APPLIED (with active servers): {', '.join(backend_names)}")
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# Log backends that remain PENDING (no active servers)
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pending_without_servers = await conn.fetch("""
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SELECT id, name FROM backends
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WHERE cluster_id = $1
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AND last_config_status = 'PENDING'
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AND NOT EXISTS (
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SELECT 1 FROM backend_servers
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WHERE backend_servers.backend_name = backends.name
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AND backend_servers.cluster_id = backends.cluster_id
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AND backend_servers.is_active = TRUE
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)
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""", cluster_id)
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if pending_without_servers:
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pending_names = [b['name'] for b in pending_without_servers]
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logger.warning(f"APPLY: {len(pending_without_servers)} backends remain PENDING (no active servers): {', '.join(pending_names)}. Add servers to deploy.")
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# Update only WAF rules with PENDING status
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await conn.execute("""
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