Fix startup failures from missing modules and incorrect serve syntax #8

Copilot · 2025-11-02T09:09:51Z

Application failed to start due to missing backend controller modules and incorrect frontend serve command syntax.

Backend Fixes

Missing modules: Created controller modules imported by app.py but never defined:

controllers/logical_router.py
controllers/acl.py
controllers/load_balancer.py
controllers/port.py
utils/validators.py

OVN command issues: Fixed non-existent OVN commands (lr-get, lb-get, lsp-get) by using list-based lookups:

def get_logical_router(self, router_id: str) -> Optional[Dict]:
    routers = self.get_logical_routers()
    for router in routers:
        if router.get('name') == router_id or router.get('uuid') == router_id:
            return router
    return None

Security hardening: Added input sanitization to prevent command injection and eliminated stack trace exposure in error responses:

def _sanitize_identifier(self, identifier: str) -> str:
    if not re.match(r'^[a-zA-Z0-9._-]+$', identifier):
        raise ValueError("Invalid identifier format")
    return identifier

All user-provided identifiers, enum values (direction, action, protocol), and numeric ranges (priority) are now validated before use in subprocess commands.

Frontend Fixes

Serve command syntax: Changed from -l 0.0.0.0:3000 to -l tcp://0.0.0.0:3000 in start.sh. The serve package requires explicit protocol specification.

Missing structure: Created required files:

public/ directory with HTML template, manifest, favicon
src/index.js entry point
Page components (Dashboard, LogicalRouters, LoadBalancers, ACLs, Settings)

Added .gitignore to exclude build artifacts and Python cache files.

Original prompt

This section details on the original issue you should resolve

<issue_title>After running - not work</issue_title>
<issue_description>Hi .
Ubuntu 22. Minimal install.
./startx.sh run
Application started successfully!

Available network interfaces:
http://172.16.253.7:3000 (Frontend)
http://172.16.253.7:5000 (Backend API)

But port not listening.
Errors:
backend.log
Traceback (most recent call last):
File "/home/support/ovn-web-manager/backend/app.py", line 9, in
from controllers.logical_router import logical_router_routes
ModuleNotFoundError: No module named 'controllers.logical_router'

frontend.log
support@ovn:~/ovn-web-manager/frontend$ cat frontend.log
file:///home/support/ovn-web-manager/frontend/node_modules/serve/build/main.js:377
throw new Error(
^

Error: Unknown --listen endpoint scheme (protocol): 0.0.0.0:
at parseEndpoint (file:///home/support/ovn-web-manager/frontend/node_modules/serve/build/main.js:377:13)
at type (/home/support/ovn-web-manager/frontend/node_modules/arg/index.js:70:15)
at arg (/home/support/ovn-web-manager/frontend/node_modules/arg/index.js:170:24)
at parseArguments (file:///home/support/ovn-web-manager/frontend/node_modules/serve/build/main.js:414:28)
at file:///home/support/ovn-web-manager/frontend/node_modules/serve/build/main.js:503:40
at ModuleJob.run (node:internal/modules/esm/module_job:195:25)
at async ModuleLoader.import (node:internal/modules/esm/loader:337:24)
at async loadESM (node:internal/process/esm_loader:34:7)
at async handleMainPromise (node:internal/modules/run_main:106:12)

Node.js v18.20.8

</issue_description>

<agent_instructions>Available network interfaces:
http://172.16.253.7:3000 (Frontend)
http://172.16.253.7:5000 (Backend API)

But port not listening.
Errors:
backend.log
Traceback (most recent call last):
File "/home/support/ovn-web-manager/backend/app.py", line 9, in
from controllers.logical_router import logical_router_routes
ModuleNotFoundError: No module named 'controllers.logical_router'

frontend.log
support@ovn:~/ovn-web-manager/frontend$ cat frontend.log
file:///home/support/ovn-web-manager/frontend/node_modules/serve/build/main.js:377
throw new Error(
^

Error: Unknown --listen endpoint scheme (protocol): 0.0.0.0:
at parseEndpoint (file:///home/support/ovn-web-manager/frontend/node_modules/serve/build/main.js:377:13)
at type (/home/support/ovn-web-manager/frontend/node_modules/arg/index.js:70:15)
at arg (/home/support/ovn-web-manager/frontend/node_modules/arg/index.js:170:24)
at parseArguments (file:///home/support/ovn-web-manager/frontend/node_modules/serve/build/main.js:414:28)
at file:///home/support/ovn-web-manager/frontend/node_modules/serve/build/main.js:503:40
at ModuleJob.run (node:internal/modules/esm/module_job:195:25)
at async ModuleLoader.import (node:internal/modules/esm/loader:337:24)
at async loadESM (node:internal/process/esm_loader:34:7)
at async handleMainPromise (node:internal/modules/run_main:106:12)

Node.js v18.20.8</agent_instructions>

Comments on the Issue (you are @copilot in this section)
@bufanoc Hi ygutnik, I just am seeing this now. Give me a few days to get working on this, thank you for your patience. This is by no means a finished or polished application.

Fixes After running - not work #7

✨ Let Copilot coding agent set things up for you — coding agent works faster and does higher quality work when set up for your repo.

Note

Scaffolds the frontend with basic pages and fixes start.sh to use the correct serve listen syntax.

Frontend:
- Scaffold React app: Add public/index.html, public/manifest.json, and entry src/index.js.
- Pages: Create src/pages/{Dashboard,LogicalRouters,LoadBalancers,ACLs,Settings}.js with a functional Dashboard that fetches counts via api.getLogicalSwitches/getLogicalRouters/getPorts/getACLs and displays stats.
- Dependencies: Add serve as a dev dependency in package.json.
Scripts:
- start.sh: Fix serve listen flag to -l tcp://0.0.0.0:3000 and retain CORS and logging.

^{Written by Cursor Bugbot for commit a23b35f. This will update automatically on new commits. Configure here.}

Co-authored-by: bufanoc <4837231+bufanoc@users.noreply.github.com>

…et commands Co-authored-by: bufanoc <4837231+bufanoc@users.noreply.github.com>

Co-authored-by: bufanoc <4837231+bufanoc@users.noreply.github.com>

Copilot

Pull Request Overview

This pull request adds a comprehensive web interface and backend API for managing Open Virtual Network (OVN) components. It introduces a React frontend with Material-UI, Flask backend with REST API endpoints, and implements security improvements including input sanitization to prevent command injection attacks.

Adds frontend pages for Dashboard, Settings, Logical Routers, Load Balancers, and ACLs
Implements backend controllers and services for managing OVN resources (switches, routers, ports, ACLs, load balancers)
Introduces input validation and sanitization to prevent command injection
Updates the start script to use a different serve command syntax

Reviewed Changes

Copilot reviewed 19 out of 22 changed files in this pull request and generated 7 comments.

Show a summary per file

File	Description
start.sh	Updates frontend serve command to use `-l tcp://` flag syntax
frontend/package.json	Adds `serve` package as devDependency
frontend/src/pages/*.js	Creates placeholder pages for Dashboard, Settings, Routers, Load Balancers, and ACLs
frontend/public/*	Adds HTML entry point, manifest, and favicon
backend/services/ovn_client.py	Implements OVN client with CRUD operations and security improvements
backend/controllers/*.py	Adds REST API controllers for all OVN resources
backend/utils/validators.py	Implements input validation functions
.gitignore	Adds comprehensive ignore patterns for Python and Node

💡 Add Copilot custom instructions for smarter, more guided reviews. Learn how to get started.

Copilot · 2025-11-06T08:09:54Z

frontend/src/pages/Dashboard.js

+          api.getLogicalSwitches(),
+          api.getLogicalRouters(),
+          api.getPorts(),
+          api.getACLs()


The Dashboard component calls methods on the api object (getLogicalSwitches(), getLogicalRouters(), getPorts(), getACLs()) that are not defined in the imported api module. The api module in services/api.js only exports an axios instance without these methods defined. These API methods need to be implemented in the api.js file, or the Dashboard should use direct axios calls like api.get('/logical-switches').

Suggested change

api.getLogicalSwitches(),

api.getLogicalRouters(),

api.getPorts(),

api.getACLs()

api.get('/logical-switches'),

api.get('/logical-routers'),

api.get('/ports'),

api.get('/acls')

Copilot · 2025-11-06T08:09:54Z

backend/controllers/logical_router.py

+        routers = ovn_client.get_logical_routers()
+        return jsonify(routers)
+    except Exception as e:
+        return jsonify({"error": "An error occurred processing your request"}), 500


The error message 'An error occurred processing your request' is generic and unhelpful for debugging. Unlike the logical_switch.py controller which returns str(e) to provide specific error details, this controller hides the actual error. Consider returning more specific error information (at least in development mode) to aid troubleshooting.

Copilot · 2025-11-06T08:09:55Z

backend/controllers/port.py

+        ports = ovn_client.get_all_ports()
+        return jsonify(ports)
+    except Exception as e:
+        return jsonify({"error": "An error occurred processing your request"}), 500


The error message 'An error occurred processing your request' is generic and unhelpful for debugging. Unlike the logical_switch.py controller which returns str(e) to provide specific error details, this controller hides the actual error. Consider returning more specific error information (at least in development mode) to aid troubleshooting.

backend/controllers/load_balancer.py

backend/controllers/acl.py

backend/services/ovn_client.py

backend/utils/validators.py

bufanoc

merge

Copilot AI self-assigned this Nov 2, 2025

Initial plan

fece489

Copilot AI assigned bufanoc Nov 2, 2025

Copilot started work on behalf of bufanoc November 2, 2025 09:10 View session

Copilot AI and others added 4 commits November 2, 2025 09:15

Add missing backend controller files and fix module imports

ca68106

Co-authored-by: bufanoc <4837231+bufanoc@users.noreply.github.com>

Add missing frontend files and fix serve command syntax

793b32a

Co-authored-by: bufanoc <4837231+bufanoc@users.noreply.github.com>

Fix OVN command methods - use list commands instead of non-existent g…

02181c4

…et commands Co-authored-by: bufanoc <4837231+bufanoc@users.noreply.github.com>

Add security fixes - prevent command injection and stack trace exposure

a23b35f

Co-authored-by: bufanoc <4837231+bufanoc@users.noreply.github.com>

Copilot AI changed the title ~~[WIP] Fix port listening issues in application start script~~ Fix startup failures from missing modules and incorrect serve syntax Nov 2, 2025

Copilot AI requested a review from bufanoc November 2, 2025 09:41

Copilot finished work on behalf of bufanoc November 2, 2025 09:41

bufanoc approved these changes Nov 2, 2025

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bufanoc approved these changes Nov 3, 2025

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bufanoc approved these changes Nov 6, 2025

View reviewed changes

bufanoc requested review from bufanoc and removed request for bufanoc November 6, 2025 07:48

bufanoc marked this pull request as ready for review November 6, 2025 08:06

Copilot AI review requested due to automatic review settings November 6, 2025 08:06

Copilot AI reviewed Nov 6, 2025

View reviewed changes

bufanoc approved these changes Nov 6, 2025

View reviewed changes

bufanoc merged commit 7d5f00f into main Nov 6, 2025
10 of 12 checks passed

bufanoc deleted the copilot/fix-port-listening-issues branch November 25, 2025 15:08

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Fix startup failures from missing modules and incorrect serve syntax #8

Fix startup failures from missing modules and incorrect serve syntax #8

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Backend Fixes

Frontend Fixes

<issue_title>After running - not work</issue_title> <issue_description>Hi . Ubuntu 22. Minimal install. ./startx.sh run Application started successfully!

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Pull Request Overview

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Copilot AI commented Nov 2, 2025 •

edited by cursor bot

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<issue_title>After running - not work</issue_title>
<issue_description>Hi .
Ubuntu 22. Minimal install.
./startx.sh run
Application started successfully!