pic/tests/test_config_apply.py

#!/usr/bin/env python3
"""
Tests for POST /api/config/apply.

The route reads _pending_restart from config_manager, spawns a background
thread/process, clears the pending flag, and returns 200.

We mock subprocess.Popen / subprocess.run and docker.from_env so the tests
run without Docker, and we capture what command-line arguments would be used.
"""

import sys
import json
import threading
import unittest
from pathlib import Path
from unittest.mock import patch, MagicMock, call

api_dir = Path(__file__).parent.parent / 'api'
sys.path.insert(0, str(api_dir))

from app import app, _set_pending_restart, _clear_pending_restart, config_manager


class TestConfigApplyRoute(unittest.TestCase):

    def setUp(self):
        app.config['TESTING'] = True
        self.client = app.test_client()
        _clear_pending_restart()

    def tearDown(self):
        _clear_pending_restart()

    # ── No pending changes ─────────────────────────────────────────────────

    def test_apply_with_no_pending_returns_200(self):
        r = self.client.post('/api/config/apply')
        self.assertEqual(r.status_code, 200)

    def test_apply_with_no_pending_returns_no_changes_message(self):
        r = self.client.post('/api/config/apply')
        data = json.loads(r.data)
        self.assertIn('message', data)
        self.assertIn('No pending', data['message'])

    # ── Pending changes present ────────────────────────────────────────────

    @patch('subprocess.Popen')
    @patch('docker.from_env')
    def test_apply_with_pending_returns_200(self, mock_docker, mock_popen):
        mock_docker.side_effect = Exception('no docker in test')
        mock_popen.return_value = MagicMock()
        _set_pending_restart(['dns_port: 53 → 5353'], ['*'])
        r = self.client.post('/api/config/apply')
        self.assertEqual(r.status_code, 200)

    @patch('subprocess.Popen')
    @patch('docker.from_env')
    def test_apply_with_pending_returns_restart_in_progress(self, mock_docker, mock_popen):
        mock_docker.side_effect = Exception('no docker in test')
        mock_popen.return_value = MagicMock()
        _set_pending_restart(['something changed'], ['*'])
        r = self.client.post('/api/config/apply')
        data = json.loads(r.data)
        self.assertTrue(data.get('restart_in_progress'))

    # ── Pending state cleared after apply ──────────────────────────────────

    @patch('threading.Thread')
    @patch('docker.from_env')
    def test_apply_clears_pending_state(self, mock_docker, mock_thread):
        mock_docker.side_effect = Exception('no docker in test')
        # Don't actually start the thread so we don't need subprocess
        mock_thread.return_value = MagicMock()
        _set_pending_restart(['config changed'], ['*'])
        self.client.post('/api/config/apply')
        pending = config_manager.configs.get('_pending_restart', {})
        self.assertFalse(pending.get('needs_restart', False))

    # ── needs_network_recreate=True → helper script includes 'down' ────────

    @patch('subprocess.Popen')
    @patch('docker.from_env')
    def test_apply_network_recreate_spawns_popen_with_down_command(
            self, mock_docker, mock_popen):
        mock_docker.side_effect = Exception('no docker in test')
        mock_popen.return_value = MagicMock()

        # Set up a wildcard pending change that also requires network recreation
        _set_pending_restart(['ip_range changed'], ['*'])
        config_manager.configs['_pending_restart']['network_recreate'] = True

        r = self.client.post('/api/config/apply')
        self.assertEqual(r.status_code, 200)

        # Wait for background thread to call Popen
        import time
        for _ in range(20):
            if mock_popen.called:
                break
            time.sleep(0.1)

        self.assertTrue(mock_popen.called,
                        'Expected subprocess.Popen to be called for wildcard restart')
        args, kwargs = mock_popen.call_args
        cmd = args[0]
        # cmd is the full docker run ... sh -c 'script'
        script_arg = cmd[-1]  # the -c argument
        self.assertIn('down', script_arg,
                      f'Expected "down" in helper script when network_recreate=True, got: {script_arg}')

    # ── needs_network_recreate=False → helper script uses only 'up -d' ─────

    @patch('subprocess.Popen')
    @patch('docker.from_env')
    def test_apply_no_network_recreate_spawns_popen_without_down(
            self, mock_docker, mock_popen):
        mock_docker.side_effect = Exception('no docker in test')
        mock_popen.return_value = MagicMock()

        _set_pending_restart(['port changed'], ['*'])
        # network_recreate defaults to False

        self.client.post('/api/config/apply')

        import time
        for _ in range(20):
            if mock_popen.called:
                break
            time.sleep(0.1)

        self.assertTrue(mock_popen.called)
        args, _ = mock_popen.call_args
        script_arg = args[0][-1]
        self.assertNotIn(' down', script_arg,
                         f'Did not expect "down" in helper script when network_recreate=False')
        self.assertIn('up -d', script_arg)

    # ── Specific containers (not wildcard) ─────────────────────────────────

    @patch('subprocess.run')
    @patch('docker.from_env')
    def test_apply_specific_containers_uses_subprocess_run(
            self, mock_docker, mock_run):
        mock_docker.side_effect = Exception('no docker in test')
        mock_run.return_value = MagicMock(returncode=0, stderr='')
        _set_pending_restart(['dns port changed'], ['dns'])

        r = self.client.post('/api/config/apply')
        self.assertEqual(r.status_code, 200)

        # Give the daemon thread a moment to call subprocess.run
        import time
        for _ in range(30):
            # Look for the compose call specifically (may not be the last call)
            compose_calls = [
                c for c in mock_run.call_args_list
                if 'compose' in (c.args[0] if c.args else [])
            ]
            if compose_calls:
                break
            time.sleep(0.1)

        compose_calls = [
            c for c in mock_run.call_args_list
            if c.args and 'compose' in c.args[0]
        ]
        self.assertTrue(
            len(compose_calls) > 0,
            f'Expected a subprocess.run call containing "compose"; got calls: {mock_run.call_args_list}'
        )
        cmd = compose_calls[-1].args[0]
        self.assertIn('up', cmd)
        self.assertIn('-d', cmd)
        self.assertIn('dns', cmd)

    # ── Exception in route body returns 500 ───────────────────────────────

    @patch('app.config_manager')
    def test_apply_returns_500_on_unexpected_exception(self, mock_cm):
        mock_cm.configs = MagicMock()
        mock_cm.configs.get.side_effect = Exception('unexpected failure')
        r = self.client.post('/api/config/apply')
        self.assertEqual(r.status_code, 500)
        self.assertIn('error', json.loads(r.data))


if __name__ == '__main__':
    unittest.main()