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Zhongwei Li
445
scripts/workflow_executor.py
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445
scripts/workflow_executor.py
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#!/usr/bin/env python3
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"""
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Workflow executor for Tailscale SSH Sync Agent.
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Common multi-machine workflow automation.
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"""
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import sys
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from pathlib import Path
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from typing import Dict, List, Optional
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import time
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import logging
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# Add utils to path
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sys.path.insert(0, str(Path(__file__).parent))
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from utils.helpers import format_duration, get_timestamp
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from sshsync_wrapper import execute_on_group, execute_on_host, push_to_hosts
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from load_balancer import get_group_capacity
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logger = logging.getLogger(__name__)
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def deploy_workflow(code_path: str,
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staging_group: str,
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prod_group: str,
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run_tests: bool = True) -> Dict:
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"""
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Full deployment pipeline: staging → test → production.
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Args:
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code_path: Path to code to deploy
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staging_group: Staging server group
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prod_group: Production server group
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run_tests: Whether to run tests on staging
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Returns:
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Dict with deployment results
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Example:
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>>> result = deploy_workflow("./dist", "staging", "production")
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>>> result['success']
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True
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>>> result['duration']
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"12m 45s"
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"""
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start_time = time.time()
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results = {
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'stages': {},
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'success': False,
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'start_time': get_timestamp()
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}
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try:
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# Stage 1: Deploy to staging
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logger.info("Stage 1: Deploying to staging...")
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stage1 = push_to_hosts(
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local_path=code_path,
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remote_path="/var/www/app",
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group=staging_group,
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recurse=True
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)
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results['stages']['staging_deploy'] = stage1
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if not stage1.get('success'):
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results['error'] = 'Staging deployment failed'
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return results
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# Build on staging
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logger.info("Building on staging...")
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build_result = execute_on_group(
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staging_group,
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"cd /var/www/app && npm run build",
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timeout=300
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)
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results['stages']['staging_build'] = build_result
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if not build_result.get('success'):
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results['error'] = 'Staging build failed'
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return results
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# Stage 2: Run tests (if enabled)
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if run_tests:
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logger.info("Stage 2: Running tests...")
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test_result = execute_on_group(
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staging_group,
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"cd /var/www/app && npm test",
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timeout=600
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)
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results['stages']['tests'] = test_result
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if not test_result.get('success'):
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results['error'] = 'Tests failed on staging'
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return results
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# Stage 3: Validation
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logger.info("Stage 3: Validating staging...")
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health_result = execute_on_group(
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staging_group,
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"curl -f http://localhost:3000/health || echo 'Health check failed'",
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timeout=10
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)
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results['stages']['staging_validation'] = health_result
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# Stage 4: Deploy to production
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logger.info("Stage 4: Deploying to production...")
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prod_deploy = push_to_hosts(
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local_path=code_path,
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remote_path="/var/www/app",
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group=prod_group,
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recurse=True
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)
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results['stages']['production_deploy'] = prod_deploy
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if not prod_deploy.get('success'):
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results['error'] = 'Production deployment failed'
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return results
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# Build and restart on production
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logger.info("Building and restarting production...")
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prod_build = execute_on_group(
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prod_group,
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"cd /var/www/app && npm run build && pm2 restart app",
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timeout=300
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)
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results['stages']['production_build'] = prod_build
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# Stage 5: Production verification
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logger.info("Stage 5: Verifying production...")
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prod_health = execute_on_group(
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prod_group,
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"curl -f http://localhost:3000/health",
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timeout=15
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)
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results['stages']['production_verification'] = prod_health
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# Success!
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results['success'] = True
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results['duration'] = format_duration(time.time() - start_time)
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return results
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except Exception as e:
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logger.error(f"Deployment workflow error: {e}")
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results['error'] = str(e)
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results['duration'] = format_duration(time.time() - start_time)
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return results
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def backup_workflow(hosts: List[str],
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backup_paths: List[str],
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destination: str) -> Dict:
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"""
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Backup files from multiple hosts.
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Args:
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hosts: List of hosts to backup from
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backup_paths: Paths to backup on each host
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destination: Local destination directory
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Returns:
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Dict with backup results
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Example:
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>>> result = backup_workflow(
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... ["db-01", "db-02"],
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... ["/var/lib/mysql"],
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... "./backups"
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... )
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>>> result['backed_up_hosts']
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2
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"""
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from sshsync_wrapper import pull_from_host
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start_time = time.time()
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results = {
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'hosts': {},
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'success': True,
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'backed_up_hosts': 0
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}
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for host in hosts:
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host_results = []
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for backup_path in backup_paths:
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# Create timestamped backup directory
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timestamp = time.strftime("%Y%m%d_%H%M%S")
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host_dest = f"{destination}/{host}_{timestamp}"
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result = pull_from_host(
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host=host,
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remote_path=backup_path,
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local_path=host_dest,
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recurse=True
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)
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host_results.append(result)
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if not result.get('success'):
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results['success'] = False
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results['hosts'][host] = host_results
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if all(r.get('success') for r in host_results):
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results['backed_up_hosts'] += 1
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results['duration'] = format_duration(time.time() - start_time)
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return results
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def sync_workflow(source_host: str,
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target_group: str,
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paths: List[str]) -> Dict:
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"""
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Sync files from one host to many.
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Args:
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source_host: Host to pull from
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target_group: Group to push to
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paths: Paths to sync
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Returns:
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Dict with sync results
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Example:
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>>> result = sync_workflow(
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... "master-db",
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... "replica-dbs",
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... ["/var/lib/mysql/config"]
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... )
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>>> result['success']
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True
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"""
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from sshsync_wrapper import pull_from_host, push_to_hosts
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import tempfile
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import shutil
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start_time = time.time()
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results = {'paths': {}, 'success': True}
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# Create temp directory
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with tempfile.TemporaryDirectory() as temp_dir:
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for path in paths:
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# Pull from source
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pull_result = pull_from_host(
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host=source_host,
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remote_path=path,
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local_path=f"{temp_dir}/{Path(path).name}",
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recurse=True
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)
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if not pull_result.get('success'):
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results['paths'][path] = {
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'success': False,
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'error': 'Pull from source failed'
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}
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results['success'] = False
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continue
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# Push to targets
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push_result = push_to_hosts(
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local_path=f"{temp_dir}/{Path(path).name}",
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remote_path=path,
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group=target_group,
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recurse=True
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)
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results['paths'][path] = {
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'pull': pull_result,
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'push': push_result,
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'success': push_result.get('success', False)
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}
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if not push_result.get('success'):
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results['success'] = False
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results['duration'] = format_duration(time.time() - start_time)
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return results
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def rolling_restart(group: str,
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service_name: str,
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wait_between: int = 30) -> Dict:
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"""
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Zero-downtime rolling restart of a service across group.
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Args:
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group: Group to restart
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service_name: Service name (e.g., "nginx", "app")
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wait_between: Seconds to wait between restarts
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Returns:
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Dict with restart results
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Example:
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>>> result = rolling_restart("web-servers", "nginx")
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>>> result['restarted_count']
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3
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"""
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from utils.helpers import parse_sshsync_config
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start_time = time.time()
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groups_config = parse_sshsync_config()
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hosts = groups_config.get(group, [])
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if not hosts:
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return {
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'success': False,
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'error': f'Group {group} not found or empty'
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}
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results = {
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'hosts': {},
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'restarted_count': 0,
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'failed_count': 0,
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'success': True
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}
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for host in hosts:
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logger.info(f"Restarting {service_name} on {host}...")
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# Restart service
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restart_result = execute_on_host(
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host,
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f"sudo systemctl restart {service_name} || sudo service {service_name} restart",
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timeout=30
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)
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# Health check
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time.sleep(5) # Wait for service to start
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health_result = execute_on_host(
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host,
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f"sudo systemctl is-active {service_name} || sudo service {service_name} status",
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timeout=10
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)
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success = restart_result.get('success') and health_result.get('success')
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results['hosts'][host] = {
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'restart': restart_result,
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'health': health_result,
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'success': success
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}
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if success:
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results['restarted_count'] += 1
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logger.info(f"✓ {host} restarted successfully")
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else:
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results['failed_count'] += 1
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results['success'] = False
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logger.error(f"✗ {host} restart failed")
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# Wait before next restart (except last)
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if host != hosts[-1]:
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time.sleep(wait_between)
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results['duration'] = format_duration(time.time() - start_time)
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return results
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def health_check_workflow(group: str,
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endpoint: str = "/health",
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timeout: int = 10) -> Dict:
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"""
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Check health endpoint across group.
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Args:
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group: Group to check
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endpoint: Health endpoint path
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timeout: Request timeout
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Returns:
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Dict with health check results
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Example:
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>>> result = health_check_workflow("production", "/health")
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>>> result['healthy_count']
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3
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"""
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from utils.helpers import parse_sshsync_config
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groups_config = parse_sshsync_config()
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hosts = groups_config.get(group, [])
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if not hosts:
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return {
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'success': False,
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'error': f'Group {group} not found or empty'
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}
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results = {
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'hosts': {},
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'healthy_count': 0,
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'unhealthy_count': 0
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}
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for host in hosts:
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health_result = execute_on_host(
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host,
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f"curl -f -s -o /dev/null -w '%{{http_code}}' http://localhost:3000{endpoint}",
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timeout=timeout
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)
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is_healthy = (
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health_result.get('success') and
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'200' in health_result.get('stdout', '')
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)
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results['hosts'][host] = {
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'healthy': is_healthy,
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'response': health_result.get('stdout', '').strip()
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}
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if is_healthy:
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results['healthy_count'] += 1
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else:
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results['unhealthy_count'] += 1
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results['success'] = results['unhealthy_count'] == 0
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return results
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def main():
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"""Test workflow executor functions."""
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print("Testing workflow executor...\n")
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print("Note: Workflow executor requires configured hosts and groups.")
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print("Tests would execute real operations, so showing dry-run simulations.\n")
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print("✅ Workflow executor ready")
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if __name__ == "__main__":
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main()
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